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Diffstat (limited to 'node_modules/terser/lib/parse.js')
| -rw-r--r-- | node_modules/terser/lib/parse.js | 3493 |
1 files changed, 0 insertions, 3493 deletions
diff --git a/node_modules/terser/lib/parse.js b/node_modules/terser/lib/parse.js deleted file mode 100644 index 9ff28d4e..00000000 --- a/node_modules/terser/lib/parse.js +++ /dev/null @@ -1,3493 +0,0 @@ -/*********************************************************************** - - A JavaScript tokenizer / parser / beautifier / compressor. - https://github.com/mishoo/UglifyJS2 - - -------------------------------- (C) --------------------------------- - - Author: Mihai Bazon - <mihai.bazon@gmail.com> - http://mihai.bazon.net/blog - - Distributed under the BSD license: - - Copyright 2012 (c) Mihai Bazon <mihai.bazon@gmail.com> - Parser based on parse-js (http://marijn.haverbeke.nl/parse-js/). - - Redistribution and use in source and binary forms, with or without - modification, are permitted provided that the following conditions - are met: - - * Redistributions of source code must retain the above - copyright notice, this list of conditions and the following - disclaimer. - - * Redistributions in binary form must reproduce the above - copyright notice, this list of conditions and the following - disclaimer in the documentation and/or other materials - provided with the distribution. - - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER “AS IS” AND ANY - EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR - PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE - LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, - OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, - PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR - PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR - TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF - THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - SUCH DAMAGE. - - ***********************************************************************/ - -"use strict"; - -import { - characters, - defaults, - makePredicate, - set_annotation, -} from "./utils/index.js"; -import { - AST_Accessor, - AST_Array, - AST_Arrow, - AST_Assign, - AST_Await, - AST_BigInt, - AST_Binary, - AST_BlockStatement, - AST_Break, - AST_Call, - AST_Case, - AST_Catch, - AST_Chain, - AST_ClassExpression, - AST_ClassPrivateProperty, - AST_ClassProperty, - AST_ClassStaticBlock, - AST_ConciseMethod, - AST_PrivateIn, - AST_PrivateGetter, - AST_PrivateMethod, - AST_PrivateSetter, - AST_Conditional, - AST_Const, - AST_Continue, - AST_Debugger, - AST_Default, - AST_DefaultAssign, - AST_DefClass, - AST_Definitions, - AST_Defun, - AST_Destructuring, - AST_Directive, - AST_Do, - AST_Dot, - AST_DotHash, - AST_EmptyStatement, - AST_Expansion, - AST_Export, - AST_False, - AST_Finally, - AST_For, - AST_ForIn, - AST_ForOf, - AST_Function, - AST_Hole, - AST_If, - AST_Import, - AST_ImportMeta, - AST_IterationStatement, - AST_Label, - AST_LabeledStatement, - AST_LabelRef, - AST_Let, - AST_NameMapping, - AST_New, - AST_NewTarget, - AST_Node, - AST_Null, - AST_Number, - AST_Object, - AST_ObjectGetter, - AST_ObjectKeyVal, - AST_ObjectProperty, - AST_ObjectSetter, - AST_PrefixedTemplateString, - AST_PropAccess, - AST_RegExp, - AST_Return, - AST_Sequence, - AST_SimpleStatement, - AST_String, - AST_Sub, - AST_Super, - AST_Switch, - AST_SymbolCatch, - AST_SymbolClass, - AST_SymbolClassProperty, - AST_SymbolConst, - AST_SymbolDeclaration, - AST_SymbolDefClass, - AST_SymbolDefun, - AST_SymbolExport, - AST_SymbolExportForeign, - AST_SymbolFunarg, - AST_SymbolImport, - AST_SymbolImportForeign, - AST_SymbolLambda, - AST_SymbolLet, - AST_SymbolMethod, - AST_SymbolRef, - AST_SymbolVar, - AST_TemplateSegment, - AST_TemplateString, - AST_This, - AST_SymbolPrivateProperty, - AST_Throw, - AST_Token, - AST_Toplevel, - AST_True, - AST_Try, - AST_TryBlock, - AST_UnaryPostfix, - AST_UnaryPrefix, - AST_Var, - AST_VarDef, - AST_While, - AST_With, - AST_Yield, - _INLINE, - _NOINLINE, - _PURE, - _KEY, - _MANGLEPROP, -} from "./ast.js"; - -var LATEST_RAW = ""; // Only used for numbers and template strings -var TEMPLATE_RAWS = new Map(); // Raw template strings - -var KEYWORDS = "break case catch class const continue debugger default delete do else export extends finally for function if in instanceof let new return switch throw try typeof var void while with"; -var KEYWORDS_ATOM = "false null true"; -var RESERVED_WORDS = "enum import super this " + KEYWORDS_ATOM + " " + KEYWORDS; -var ALL_RESERVED_WORDS = "implements interface package private protected public static " + RESERVED_WORDS; -var KEYWORDS_BEFORE_EXPRESSION = "return new delete throw else case yield await"; - -KEYWORDS = makePredicate(KEYWORDS); -RESERVED_WORDS = makePredicate(RESERVED_WORDS); -KEYWORDS_BEFORE_EXPRESSION = makePredicate(KEYWORDS_BEFORE_EXPRESSION); -KEYWORDS_ATOM = makePredicate(KEYWORDS_ATOM); -ALL_RESERVED_WORDS = makePredicate(ALL_RESERVED_WORDS); - -var OPERATOR_CHARS = makePredicate(characters("+-*&%=<>!?|~^")); - -var RE_NUM_LITERAL = /[0-9a-f]/i; -var RE_HEX_NUMBER = /^0x[0-9a-f]+$/i; -var RE_OCT_NUMBER = /^0[0-7]+$/; -var RE_ES6_OCT_NUMBER = /^0o[0-7]+$/i; -var RE_BIN_NUMBER = /^0b[01]+$/i; -var RE_DEC_NUMBER = /^\d*\.?\d*(?:e[+-]?\d*(?:\d\.?|\.?\d)\d*)?$/i; -var RE_BIG_INT = /^(0[xob])?[0-9a-f]+n$/i; - -var OPERATORS = makePredicate([ - "in", - "instanceof", - "typeof", - "new", - "void", - "delete", - "++", - "--", - "+", - "-", - "!", - "~", - "&", - "|", - "^", - "*", - "**", - "/", - "%", - ">>", - "<<", - ">>>", - "<", - ">", - "<=", - ">=", - "==", - "===", - "!=", - "!==", - "?", - "=", - "+=", - "-=", - "||=", - "&&=", - "??=", - "/=", - "*=", - "**=", - "%=", - ">>=", - "<<=", - ">>>=", - "|=", - "^=", - "&=", - "&&", - "??", - "||", -]); - -var WHITESPACE_CHARS = makePredicate(characters(" \u00a0\n\r\t\f\u000b\u200b\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u202f\u205f\u3000\uFEFF")); - -var NEWLINE_CHARS = makePredicate(characters("\n\r\u2028\u2029")); - -var PUNC_AFTER_EXPRESSION = makePredicate(characters(";]),:")); - -var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,;:")); - -var PUNC_CHARS = makePredicate(characters("[]{}(),;:")); - -/* -----[ Tokenizer ]----- */ - -// surrogate safe regexps adapted from https://github.com/mathiasbynens/unicode-8.0.0/tree/89b412d8a71ecca9ed593d9e9fa073ab64acfebe/Binary_Property -var UNICODE = { - ID_Start: 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- ID_Continue: 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-}; - -function get_full_char(str, pos) { - if (is_surrogate_pair_head(str.charCodeAt(pos))) { - if (is_surrogate_pair_tail(str.charCodeAt(pos + 1))) { - return str.charAt(pos) + str.charAt(pos + 1); - } - } else if (is_surrogate_pair_tail(str.charCodeAt(pos))) { - if (is_surrogate_pair_head(str.charCodeAt(pos - 1))) { - return str.charAt(pos - 1) + str.charAt(pos); - } - } - return str.charAt(pos); -} - -function get_full_char_code(str, pos) { - // https://en.wikipedia.org/wiki/Universal_Character_Set_characters#Surrogates - if (is_surrogate_pair_head(str.charCodeAt(pos))) { - return 0x10000 + (str.charCodeAt(pos) - 0xd800 << 10) + str.charCodeAt(pos + 1) - 0xdc00; - } - return str.charCodeAt(pos); -} - -function get_full_char_length(str) { - var surrogates = 0; - - for (var i = 0; i < str.length; i++) { - if (is_surrogate_pair_head(str.charCodeAt(i)) && is_surrogate_pair_tail(str.charCodeAt(i + 1))) { - surrogates++; - i++; - } - } - - return str.length - surrogates; -} - -function from_char_code(code) { - // Based on https://github.com/mathiasbynens/String.fromCodePoint/blob/master/fromcodepoint.js - if (code > 0xFFFF) { - code -= 0x10000; - return (String.fromCharCode((code >> 10) + 0xD800) + - String.fromCharCode((code % 0x400) + 0xDC00)); - } - return String.fromCharCode(code); -} - -function is_surrogate_pair_head(code) { - return code >= 0xd800 && code <= 0xdbff; -} - -function is_surrogate_pair_tail(code) { - return code >= 0xdc00 && code <= 0xdfff; -} - -function is_digit(code) { - return code >= 48 && code <= 57; -} - -function is_identifier_start(ch) { - return UNICODE.ID_Start.test(ch); -} - -function is_identifier_char(ch) { - return UNICODE.ID_Continue.test(ch); -} - -const BASIC_IDENT = /^[a-z_$][a-z0-9_$]*$/i; - -function is_basic_identifier_string(str) { - return BASIC_IDENT.test(str); -} - -function is_identifier_string(str, allow_surrogates) { - if (BASIC_IDENT.test(str)) { - return true; - } - if (!allow_surrogates && /[\ud800-\udfff]/.test(str)) { - return false; - } - var match = UNICODE.ID_Start.exec(str); - if (!match || match.index !== 0) { - return false; - } - - str = str.slice(match[0].length); - if (!str) { - return true; - } - - match = UNICODE.ID_Continue.exec(str); - return !!match && match[0].length === str.length; -} - -function parse_js_number(num, allow_e = true) { - if (!allow_e && num.includes("e")) { - return NaN; - } - if (RE_HEX_NUMBER.test(num)) { - return parseInt(num.substr(2), 16); - } else if (RE_OCT_NUMBER.test(num)) { - return parseInt(num.substr(1), 8); - } else if (RE_ES6_OCT_NUMBER.test(num)) { - return parseInt(num.substr(2), 8); - } else if (RE_BIN_NUMBER.test(num)) { - return parseInt(num.substr(2), 2); - } else if (RE_DEC_NUMBER.test(num)) { - return parseFloat(num); - } else { - var val = parseFloat(num); - if (val == num) return val; - } -} - -class JS_Parse_Error extends Error { - constructor(message, filename, line, col, pos) { - super(); - - this.name = "SyntaxError"; - this.message = message; - this.filename = filename; - this.line = line; - this.col = col; - this.pos = pos; - } -} - -function js_error(message, filename, line, col, pos) { - throw new JS_Parse_Error(message, filename, line, col, pos); -} - -function is_token(token, type, val) { - return token.type == type && (val == null || token.value == val); -} - -var EX_EOF = {}; - -function tokenizer($TEXT, filename, html5_comments, shebang) { - var S = { - text : $TEXT, - filename : filename, - pos : 0, - tokpos : 0, - line : 1, - tokline : 0, - col : 0, - tokcol : 0, - newline_before : false, - regex_allowed : false, - brace_counter : 0, - template_braces : [], - comments_before : [], - directives : {}, - directive_stack : [] - }; - - function peek() { return get_full_char(S.text, S.pos); } - - // Used because parsing ?. involves a lookahead for a digit - function is_option_chain_op() { - const must_be_dot = S.text.charCodeAt(S.pos + 1) === 46; - if (!must_be_dot) return false; - - const cannot_be_digit = S.text.charCodeAt(S.pos + 2); - return cannot_be_digit < 48 || cannot_be_digit > 57; - } - - function next(signal_eof, in_string) { - var ch = get_full_char(S.text, S.pos++); - if (signal_eof && !ch) - throw EX_EOF; - if (NEWLINE_CHARS.has(ch)) { - S.newline_before = S.newline_before || !in_string; - ++S.line; - S.col = 0; - if (ch == "\r" && peek() == "\n") { - // treat a \r\n sequence as a single \n - ++S.pos; - ch = "\n"; - } - } else { - if (ch.length > 1) { - ++S.pos; - ++S.col; - } - ++S.col; - } - return ch; - } - - function forward(i) { - while (i--) next(); - } - - function looking_at(str) { - return S.text.substr(S.pos, str.length) == str; - } - - function find_eol() { - var text = S.text; - for (var i = S.pos, n = S.text.length; i < n; ++i) { - var ch = text[i]; - if (NEWLINE_CHARS.has(ch)) - return i; - } - return -1; - } - - function find(what, signal_eof) { - var pos = S.text.indexOf(what, S.pos); - if (signal_eof && pos == -1) throw EX_EOF; - return pos; - } - - function start_token() { - S.tokline = S.line; - S.tokcol = S.col; - S.tokpos = S.pos; - } - - var prev_was_dot = false; - var previous_token = null; - function token(type, value, is_comment) { - S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX.has(value)) || - (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION.has(value)) || - (type == "punc" && PUNC_BEFORE_EXPRESSION.has(value))) || - (type == "arrow"); - if (type == "punc" && (value == "." || value == "?.")) { - prev_was_dot = true; - } else if (!is_comment) { - prev_was_dot = false; - } - const line = S.tokline; - const col = S.tokcol; - const pos = S.tokpos; - const nlb = S.newline_before; - const file = filename; - let comments_before = []; - let comments_after = []; - - if (!is_comment) { - comments_before = S.comments_before; - comments_after = S.comments_before = []; - } - S.newline_before = false; - const tok = new AST_Token(type, value, line, col, pos, nlb, comments_before, comments_after, file); - - if (!is_comment) previous_token = tok; - return tok; - } - - function skip_whitespace() { - while (WHITESPACE_CHARS.has(peek())) - next(); - } - - function read_while(pred) { - var ret = "", ch, i = 0; - while ((ch = peek()) && pred(ch, i++)) - ret += next(); - return ret; - } - - function parse_error(err) { - js_error(err, filename, S.tokline, S.tokcol, S.tokpos); - } - - function read_num(prefix) { - var has_e = false, after_e = false, has_x = false, has_dot = prefix == ".", is_big_int = false, numeric_separator = false; - var num = read_while(function(ch, i) { - if (is_big_int) return false; - - var code = ch.charCodeAt(0); - switch (code) { - case 95: // _ - return (numeric_separator = true); - case 98: case 66: // bB - return (has_x = true); // Can occur in hex sequence, don't return false yet - case 111: case 79: // oO - case 120: case 88: // xX - return has_x ? false : (has_x = true); - case 101: case 69: // eE - return has_x ? true : has_e ? false : (has_e = after_e = true); - case 45: // - - return after_e || (i == 0 && !prefix); - case 43: // + - return after_e; - case (after_e = false, 46): // . - return (!has_dot && !has_x && !has_e) ? (has_dot = true) : false; - } - - if (ch === "n") { - is_big_int = true; - - return true; - } - - return RE_NUM_LITERAL.test(ch); - }); - if (prefix) num = prefix + num; - - LATEST_RAW = num; - - if (RE_OCT_NUMBER.test(num) && next_token.has_directive("use strict")) { - parse_error("Legacy octal literals are not allowed in strict mode"); - } - if (numeric_separator) { - if (num.endsWith("_")) { - parse_error("Numeric separators are not allowed at the end of numeric literals"); - } else if (num.includes("__")) { - parse_error("Only one underscore is allowed as numeric separator"); - } - num = num.replace(/_/g, ""); - } - if (num.endsWith("n")) { - const without_n = num.slice(0, -1); - const allow_e = RE_HEX_NUMBER.test(without_n); - const valid = parse_js_number(without_n, allow_e); - if (!has_dot && RE_BIG_INT.test(num) && !isNaN(valid)) - return token("big_int", without_n); - parse_error("Invalid or unexpected token"); - } - var valid = parse_js_number(num); - if (!isNaN(valid)) { - return token("num", valid); - } else { - parse_error("Invalid syntax: " + num); - } - } - - function is_octal(ch) { - return ch >= "0" && ch <= "7"; - } - - function read_escaped_char(in_string, strict_hex, template_string) { - var ch = next(true, in_string); - switch (ch.charCodeAt(0)) { - case 110 : return "\n"; - case 114 : return "\r"; - case 116 : return "\t"; - case 98 : return "\b"; - case 118 : return "\u000b"; // \v - case 102 : return "\f"; - case 120 : return String.fromCharCode(hex_bytes(2, strict_hex)); // \x - case 117 : // \u - if (peek() == "{") { - next(true); - if (peek() === "}") - parse_error("Expecting hex-character between {}"); - while (peek() == "0") next(true); // No significance - var result, length = find("}", true) - S.pos; - // Avoid 32 bit integer overflow (1 << 32 === 1) - // We know first character isn't 0 and thus out of range anyway - if (length > 6 || (result = hex_bytes(length, strict_hex)) > 0x10FFFF) { - parse_error("Unicode reference out of bounds"); - } - next(true); - return from_char_code(result); - } - return String.fromCharCode(hex_bytes(4, strict_hex)); - case 10 : return ""; // newline - case 13 : // \r - if (peek() == "\n") { // DOS newline - next(true, in_string); - return ""; - } - } - if (is_octal(ch)) { - if (template_string && strict_hex) { - const represents_null_character = ch === "0" && !is_octal(peek()); - if (!represents_null_character) { - parse_error("Octal escape sequences are not allowed in template strings"); - } - } - return read_octal_escape_sequence(ch, strict_hex); - } - return ch; - } - - function read_octal_escape_sequence(ch, strict_octal) { - // Read - var p = peek(); - if (p >= "0" && p <= "7") { - ch += next(true); - if (ch[0] <= "3" && (p = peek()) >= "0" && p <= "7") - ch += next(true); - } - - // Parse - if (ch === "0") return "\0"; - if (ch.length > 0 && next_token.has_directive("use strict") && strict_octal) - parse_error("Legacy octal escape sequences are not allowed in strict mode"); - return String.fromCharCode(parseInt(ch, 8)); - } - - function hex_bytes(n, strict_hex) { - var num = 0; - for (; n > 0; --n) { - if (!strict_hex && isNaN(parseInt(peek(), 16))) { - return parseInt(num, 16) || ""; - } - var digit = next(true); - if (isNaN(parseInt(digit, 16))) - parse_error("Invalid hex-character pattern in string"); - num += digit; - } - return parseInt(num, 16); - } - - var read_string = with_eof_error("Unterminated string constant", function() { - const start_pos = S.pos; - var quote = next(), ret = []; - for (;;) { - var ch = next(true, true); - if (ch == "\\") ch = read_escaped_char(true, true); - else if (ch == "\r" || ch == "\n") parse_error("Unterminated string constant"); - else if (ch == quote) break; - ret.push(ch); - } - var tok = token("string", ret.join("")); - LATEST_RAW = S.text.slice(start_pos, S.pos); - tok.quote = quote; - return tok; - }); - - var read_template_characters = with_eof_error("Unterminated template", function(begin) { - if (begin) { - S.template_braces.push(S.brace_counter); - } - var content = "", raw = "", ch, tok; - next(true, true); - while ((ch = next(true, true)) != "`") { - if (ch == "\r") { - if (peek() == "\n") ++S.pos; - ch = "\n"; - } else if (ch == "$" && peek() == "{") { - next(true, true); - S.brace_counter++; - tok = token(begin ? "template_head" : "template_substitution", content); - TEMPLATE_RAWS.set(tok, raw); - tok.template_end = false; - return tok; - } - - raw += ch; - if (ch == "\\") { - var tmp = S.pos; - var prev_is_tag = previous_token && (previous_token.type === "name" || previous_token.type === "punc" && (previous_token.value === ")" || previous_token.value === "]")); - ch = read_escaped_char(true, !prev_is_tag, true); - raw += S.text.substr(tmp, S.pos - tmp); - } - - content += ch; - } - S.template_braces.pop(); - tok = token(begin ? "template_head" : "template_substitution", content); - TEMPLATE_RAWS.set(tok, raw); - tok.template_end = true; - return tok; - }); - - function skip_line_comment(type) { - var regex_allowed = S.regex_allowed; - var i = find_eol(), ret; - if (i == -1) { - ret = S.text.substr(S.pos); - S.pos = S.text.length; - } else { - ret = S.text.substring(S.pos, i); - S.pos = i; - } - S.col = S.tokcol + (S.pos - S.tokpos); - S.comments_before.push(token(type, ret, true)); - S.regex_allowed = regex_allowed; - return next_token; - } - - var skip_multiline_comment = with_eof_error("Unterminated multiline comment", function() { - var regex_allowed = S.regex_allowed; - var i = find("*/", true); - var text = S.text.substring(S.pos, i).replace(/\r\n|\r|\u2028|\u2029/g, "\n"); - // update stream position - forward(get_full_char_length(text) /* text length doesn't count \r\n as 2 char while S.pos - i does */ + 2); - S.comments_before.push(token("comment2", text, true)); - S.newline_before = S.newline_before || text.includes("\n"); - S.regex_allowed = regex_allowed; - return next_token; - }); - - var read_name = with_eof_error("Unterminated identifier name", function() { - var name = [], ch, escaped = false; - var read_escaped_identifier_char = function() { - escaped = true; - next(); - if (peek() !== "u") { - parse_error("Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}"); - } - return read_escaped_char(false, true); - }; - - // Read first character (ID_Start) - if ((ch = peek()) === "\\") { - ch = read_escaped_identifier_char(); - if (!is_identifier_start(ch)) { - parse_error("First identifier char is an invalid identifier char"); - } - } else if (is_identifier_start(ch)) { - next(); - } else { - return ""; - } - - name.push(ch); - - // Read ID_Continue - while ((ch = peek()) != null) { - if ((ch = peek()) === "\\") { - ch = read_escaped_identifier_char(); - if (!is_identifier_char(ch)) { - parse_error("Invalid escaped identifier char"); - } - } else { - if (!is_identifier_char(ch)) { - break; - } - next(); - } - name.push(ch); - } - const name_str = name.join(""); - if (RESERVED_WORDS.has(name_str) && escaped) { - parse_error("Escaped characters are not allowed in keywords"); - } - return name_str; - }); - - var read_regexp = with_eof_error("Unterminated regular expression", function(source) { - var prev_backslash = false, ch, in_class = false; - while ((ch = next(true))) if (NEWLINE_CHARS.has(ch)) { - parse_error("Unexpected line terminator"); - } else if (prev_backslash) { - if (/^[\u0000-\u007F]$/.test(ch)) { - source += "\\" + ch; - } else { - // Remove the useless slash before the escape, but only for characters that won't be added to regexp syntax - source += ch; - } - prev_backslash = false; - } else if (ch == "[") { - in_class = true; - source += ch; - } else if (ch == "]" && in_class) { - in_class = false; - source += ch; - } else if (ch == "/" && !in_class) { - break; - } else if (ch == "\\") { - prev_backslash = true; - } else { - source += ch; - } - const flags = read_name(); - return token("regexp", "/" + source + "/" + flags); - }); - - function read_operator(prefix) { - function grow(op) { - if (!peek()) return op; - var bigger = op + peek(); - if (OPERATORS.has(bigger)) { - next(); - return grow(bigger); - } else { - return op; - } - } - return token("operator", grow(prefix || next())); - } - - function handle_slash() { - next(); - switch (peek()) { - case "/": - next(); - return skip_line_comment("comment1"); - case "*": - next(); - return skip_multiline_comment(); - } - return S.regex_allowed ? read_regexp("") : read_operator("/"); - } - - function handle_eq_sign() { - next(); - if (peek() === ">") { - next(); - return token("arrow", "=>"); - } else { - return read_operator("="); - } - } - - function handle_dot() { - next(); - if (is_digit(peek().charCodeAt(0))) { - return read_num("."); - } - if (peek() === ".") { - next(); // Consume second dot - next(); // Consume third dot - return token("expand", "..."); - } - - return token("punc", "."); - } - - function read_word() { - var word = read_name(); - if (prev_was_dot) return token("name", word); - return KEYWORDS_ATOM.has(word) ? token("atom", word) - : !KEYWORDS.has(word) ? token("name", word) - : OPERATORS.has(word) ? token("operator", word) - : token("keyword", word); - } - - function read_private_word() { - next(); - return token("privatename", read_name()); - } - - function with_eof_error(eof_error, cont) { - return function(x) { - try { - return cont(x); - } catch(ex) { - if (ex === EX_EOF) parse_error(eof_error); - else throw ex; - } - }; - } - - function next_token(force_regexp) { - if (force_regexp != null) - return read_regexp(force_regexp); - if (shebang && S.pos == 0 && looking_at("#!")) { - start_token(); - forward(2); - skip_line_comment("comment5"); - } - for (;;) { - skip_whitespace(); - start_token(); - if (html5_comments) { - if (looking_at("<!--")) { - forward(4); - skip_line_comment("comment3"); - continue; - } - if (looking_at("-->") && S.newline_before) { - forward(3); - skip_line_comment("comment4"); - continue; - } - } - var ch = peek(); - if (!ch) return token("eof"); - var code = ch.charCodeAt(0); - switch (code) { - case 34: case 39: return read_string(); - case 46: return handle_dot(); - case 47: { - var tok = handle_slash(); - if (tok === next_token) continue; - return tok; - } - case 61: return handle_eq_sign(); - case 63: { - if (!is_option_chain_op()) break; // Handled below - - next(); // ? - next(); // . - - return token("punc", "?."); - } - case 96: return read_template_characters(true); - case 123: - S.brace_counter++; - break; - case 125: - S.brace_counter--; - if (S.template_braces.length > 0 - && S.template_braces[S.template_braces.length - 1] === S.brace_counter) - return read_template_characters(false); - break; - } - if (is_digit(code)) return read_num(); - if (PUNC_CHARS.has(ch)) return token("punc", next()); - if (OPERATOR_CHARS.has(ch)) return read_operator(); - if (code == 92 || is_identifier_start(ch)) return read_word(); - if (code == 35) return read_private_word(); - break; - } - parse_error("Unexpected character '" + ch + "'"); - } - - next_token.next = next; - next_token.peek = peek; - - next_token.context = function(nc) { - if (nc) S = nc; - return S; - }; - - next_token.add_directive = function(directive) { - S.directive_stack[S.directive_stack.length - 1].push(directive); - - if (S.directives[directive] === undefined) { - S.directives[directive] = 1; - } else { - S.directives[directive]++; - } - }; - - next_token.push_directives_stack = function() { - S.directive_stack.push([]); - }; - - next_token.pop_directives_stack = function() { - var directives = S.directive_stack[S.directive_stack.length - 1]; - - for (var i = 0; i < directives.length; i++) { - S.directives[directives[i]]--; - } - - S.directive_stack.pop(); - }; - - next_token.has_directive = function(directive) { - return S.directives[directive] > 0; - }; - - return next_token; - -} - -/* -----[ Parser (constants) ]----- */ - -var UNARY_PREFIX = makePredicate([ - "typeof", - "void", - "delete", - "--", - "++", - "!", - "~", - "-", - "+" -]); - -var UNARY_POSTFIX = makePredicate([ "--", "++" ]); - -var ASSIGNMENT = makePredicate([ "=", "+=", "-=", "??=", "&&=", "||=", "/=", "*=", "**=", "%=", ">>=", "<<=", ">>>=", "|=", "^=", "&=" ]); - -var LOGICAL_ASSIGNMENT = makePredicate([ "??=", "&&=", "||=" ]); - -var PRECEDENCE = (function(a, ret) { - for (var i = 0; i < a.length; ++i) { - for (const op of a[i]) { - ret[op] = i + 1; - } - } - return ret; -})( - [ - ["||"], - ["??"], - ["&&"], - ["|"], - ["^"], - ["&"], - ["==", "===", "!=", "!=="], - ["<", ">", "<=", ">=", "in", "instanceof"], - [">>", "<<", ">>>"], - ["+", "-"], - ["*", "/", "%"], - ["**"] - ], - {} -); - -var ATOMIC_START_TOKEN = makePredicate([ "atom", "num", "big_int", "string", "regexp", "name"]); - -/* -----[ Parser ]----- */ - -function parse($TEXT, options) { - // maps start tokens to count of comments found outside of their parens - // Example: /* I count */ ( /* I don't */ foo() ) - // Useful because comments_before property of call with parens outside - // contains both comments inside and outside these parens. Used to find the - // right #__PURE__ comments for an expression - const outer_comments_before_counts = new WeakMap(); - - options = defaults(options, { - bare_returns : false, - ecma : null, // Legacy - expression : false, - filename : null, - html5_comments : true, - module : false, - shebang : true, - strict : false, - toplevel : null, - }, true); - - var S = { - input : (typeof $TEXT == "string" - ? tokenizer($TEXT, options.filename, - options.html5_comments, options.shebang) - : $TEXT), - token : null, - prev : null, - peeked : null, - in_function : 0, - in_async : -1, - in_generator : -1, - in_directives : true, - in_loop : 0, - labels : [] - }; - - S.token = next(); - - function is(type, value) { - return is_token(S.token, type, value); - } - - function peek() { return S.peeked || (S.peeked = S.input()); } - - function next() { - S.prev = S.token; - - if (!S.peeked) peek(); - S.token = S.peeked; - S.peeked = null; - S.in_directives = S.in_directives && ( - S.token.type == "string" || is("punc", ";") - ); - return S.token; - } - - function prev() { - return S.prev; - } - - function croak(msg, line, col, pos) { - var ctx = S.input.context(); - js_error(msg, - ctx.filename, - line != null ? line : ctx.tokline, - col != null ? col : ctx.tokcol, - pos != null ? pos : ctx.tokpos); - } - - function token_error(token, msg) { - croak(msg, token.line, token.col); - } - - function unexpected(token) { - if (token == null) - token = S.token; - token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")"); - } - - function expect_token(type, val) { - if (is(type, val)) { - return next(); - } - token_error(S.token, "Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val + "»"); - } - - function expect(punc) { return expect_token("punc", punc); } - - function has_newline_before(token) { - return token.nlb || !token.comments_before.every((comment) => !comment.nlb); - } - - function can_insert_semicolon() { - return !options.strict - && (is("eof") || is("punc", "}") || has_newline_before(S.token)); - } - - function is_in_generator() { - return S.in_generator === S.in_function; - } - - function is_in_async() { - return S.in_async === S.in_function; - } - - function can_await() { - return ( - S.in_async === S.in_function - || S.in_function === 0 && S.input.has_directive("use strict") - ); - } - - function semicolon(optional) { - if (is("punc", ";")) next(); - else if (!optional && !can_insert_semicolon()) unexpected(); - } - - function parenthesised() { - expect("("); - var exp = expression(true); - expect(")"); - return exp; - } - - function embed_tokens(parser) { - return function _embed_tokens_wrapper(...args) { - const start = S.token; - const expr = parser(...args); - expr.start = start; - expr.end = prev(); - return expr; - }; - } - - function handle_regexp() { - if (is("operator", "/") || is("operator", "/=")) { - S.peeked = null; - S.token = S.input(S.token.value.substr(1)); // force regexp - } - } - - var statement = embed_tokens(function statement(is_export_default, is_for_body, is_if_body) { - handle_regexp(); - switch (S.token.type) { - case "string": - if (S.in_directives) { - var token = peek(); - if (!LATEST_RAW.includes("\\") - && (is_token(token, "punc", ";") - || is_token(token, "punc", "}") - || has_newline_before(token) - || is_token(token, "eof"))) { - S.input.add_directive(S.token.value); - } else { - S.in_directives = false; - } - } - var dir = S.in_directives, stat = simple_statement(); - return dir && stat.body instanceof AST_String ? new AST_Directive(stat.body) : stat; - case "template_head": - case "num": - case "big_int": - case "regexp": - case "operator": - case "atom": - return simple_statement(); - - case "name": - case "privatename": - if(is("privatename") && !S.in_class) - croak("Private field must be used in an enclosing class"); - - if (S.token.value == "async" && is_token(peek(), "keyword", "function")) { - next(); - next(); - if (is_for_body) { - croak("functions are not allowed as the body of a loop"); - } - return function_(AST_Defun, false, true, is_export_default); - } - if (S.token.value == "import" && !is_token(peek(), "punc", "(") && !is_token(peek(), "punc", ".")) { - next(); - var node = import_statement(); - semicolon(); - return node; - } - return is_token(peek(), "punc", ":") - ? labeled_statement() - : simple_statement(); - - case "punc": - switch (S.token.value) { - case "{": - return new AST_BlockStatement({ - start : S.token, - body : block_(), - end : prev() - }); - case "[": - case "(": - return simple_statement(); - case ";": - S.in_directives = false; - next(); - return new AST_EmptyStatement(); - default: - unexpected(); - } - - case "keyword": - switch (S.token.value) { - case "break": - next(); - return break_cont(AST_Break); - - case "continue": - next(); - return break_cont(AST_Continue); - - case "debugger": - next(); - semicolon(); - return new AST_Debugger(); - - case "do": - next(); - var body = in_loop(statement); - expect_token("keyword", "while"); - var condition = parenthesised(); - semicolon(true); - return new AST_Do({ - body : body, - condition : condition - }); - - case "while": - next(); - return new AST_While({ - condition : parenthesised(), - body : in_loop(function() { return statement(false, true); }) - }); - - case "for": - next(); - return for_(); - - case "class": - next(); - if (is_for_body) { - croak("classes are not allowed as the body of a loop"); - } - if (is_if_body) { - croak("classes are not allowed as the body of an if"); - } - return class_(AST_DefClass, is_export_default); - - case "function": - next(); - if (is_for_body) { - croak("functions are not allowed as the body of a loop"); - } - return function_(AST_Defun, false, false, is_export_default); - - case "if": - next(); - return if_(); - - case "return": - if (S.in_function == 0 && !options.bare_returns) - croak("'return' outside of function"); - next(); - var value = null; - if (is("punc", ";")) { - next(); - } else if (!can_insert_semicolon()) { - value = expression(true); - semicolon(); - } - return new AST_Return({ - value: value - }); - - case "switch": - next(); - return new AST_Switch({ - expression : parenthesised(), - body : in_loop(switch_body_) - }); - - case "throw": - next(); - if (has_newline_before(S.token)) - croak("Illegal newline after 'throw'"); - var value = expression(true); - semicolon(); - return new AST_Throw({ - value: value - }); - - case "try": - next(); - return try_(); - - case "var": - next(); - var node = var_(); - semicolon(); - return node; - - case "let": - next(); - var node = let_(); - semicolon(); - return node; - - case "const": - next(); - var node = const_(); - semicolon(); - return node; - - case "with": - if (S.input.has_directive("use strict")) { - croak("Strict mode may not include a with statement"); - } - next(); - return new AST_With({ - expression : parenthesised(), - body : statement() - }); - - case "export": - if (!is_token(peek(), "punc", "(")) { - next(); - var node = export_statement(); - if (is("punc", ";")) semicolon(); - return node; - } - } - } - unexpected(); - }); - - function labeled_statement() { - var label = as_symbol(AST_Label); - if (label.name === "await" && is_in_async()) { - token_error(S.prev, "await cannot be used as label inside async function"); - } - if (S.labels.some((l) => l.name === label.name)) { - // ECMA-262, 12.12: An ECMAScript program is considered - // syntactically incorrect if it contains a - // LabelledStatement that is enclosed by a - // LabelledStatement with the same Identifier as label. - croak("Label " + label.name + " defined twice"); - } - expect(":"); - S.labels.push(label); - var stat = statement(); - S.labels.pop(); - if (!(stat instanceof AST_IterationStatement)) { - // check for `continue` that refers to this label. - // those should be reported as syntax errors. - // https://github.com/mishoo/UglifyJS2/issues/287 - label.references.forEach(function(ref) { - if (ref instanceof AST_Continue) { - ref = ref.label.start; - croak("Continue label `" + label.name + "` refers to non-IterationStatement.", - ref.line, ref.col, ref.pos); - } - }); - } - return new AST_LabeledStatement({ body: stat, label: label }); - } - - function simple_statement(tmp) { - return new AST_SimpleStatement({ body: (tmp = expression(true), semicolon(), tmp) }); - } - - function break_cont(type) { - var label = null, ldef; - if (!can_insert_semicolon()) { - label = as_symbol(AST_LabelRef, true); - } - if (label != null) { - ldef = S.labels.find((l) => l.name === label.name); - if (!ldef) - croak("Undefined label " + label.name); - label.thedef = ldef; - } else if (S.in_loop == 0) - croak(type.TYPE + " not inside a loop or switch"); - semicolon(); - var stat = new type({ label: label }); - if (ldef) ldef.references.push(stat); - return stat; - } - - function for_() { - var for_await_error = "`for await` invalid in this context"; - var await_tok = S.token; - if (await_tok.type == "name" && await_tok.value == "await") { - if (!can_await()) { - token_error(await_tok, for_await_error); - } - next(); - } else { - await_tok = false; - } - expect("("); - var init = null; - if (!is("punc", ";")) { - init = - is("keyword", "var") ? (next(), var_(true)) : - is("keyword", "let") ? (next(), let_(true)) : - is("keyword", "const") ? (next(), const_(true)) : - expression(true, true); - var is_in = is("operator", "in"); - var is_of = is("name", "of"); - if (await_tok && !is_of) { - token_error(await_tok, for_await_error); - } - if (is_in || is_of) { - if (init instanceof AST_Definitions) { - if (init.definitions.length > 1) - token_error(init.start, "Only one variable declaration allowed in for..in loop"); - } else if (!(is_assignable(init) || (init = to_destructuring(init)) instanceof AST_Destructuring)) { - token_error(init.start, "Invalid left-hand side in for..in loop"); - } - next(); - if (is_in) { - return for_in(init); - } else { - return for_of(init, !!await_tok); - } - } - } else if (await_tok) { - token_error(await_tok, for_await_error); - } - return regular_for(init); - } - - function regular_for(init) { - expect(";"); - var test = is("punc", ";") ? null : expression(true); - expect(";"); - var step = is("punc", ")") ? null : expression(true); - expect(")"); - return new AST_For({ - init : init, - condition : test, - step : step, - body : in_loop(function() { return statement(false, true); }) - }); - } - - function for_of(init, is_await) { - var lhs = init instanceof AST_Definitions ? init.definitions[0].name : null; - var obj = expression(true); - expect(")"); - return new AST_ForOf({ - await : is_await, - init : init, - name : lhs, - object : obj, - body : in_loop(function() { return statement(false, true); }) - }); - } - - function for_in(init) { - var obj = expression(true); - expect(")"); - return new AST_ForIn({ - init : init, - object : obj, - body : in_loop(function() { return statement(false, true); }) - }); - } - - var arrow_function = function(start, argnames, is_async) { - if (has_newline_before(S.token)) { - croak("Unexpected newline before arrow (=>)"); - } - - expect_token("arrow", "=>"); - - var body = _function_body(is("punc", "{"), false, is_async); - - var end = - body instanceof Array && body.length ? body[body.length - 1].end : - body instanceof Array ? start : - body.end; - - return new AST_Arrow({ - start : start, - end : end, - async : is_async, - argnames : argnames, - body : body - }); - }; - - var function_ = function(ctor, is_generator_property, is_async, is_export_default) { - var in_statement = ctor === AST_Defun; - var is_generator = is("operator", "*"); - if (is_generator) { - next(); - } - - var name = is("name") ? as_symbol(in_statement ? AST_SymbolDefun : AST_SymbolLambda) : null; - if (in_statement && !name) { - if (is_export_default) { - ctor = AST_Function; - } else { - unexpected(); - } - } - - if (name && ctor !== AST_Accessor && !(name instanceof AST_SymbolDeclaration)) - unexpected(prev()); - - var args = []; - var body = _function_body(true, is_generator || is_generator_property, is_async, name, args); - return new ctor({ - start : args.start, - end : body.end, - is_generator: is_generator, - async : is_async, - name : name, - argnames: args, - body : body - }); - }; - - class UsedParametersTracker { - constructor(is_parameter, strict, duplicates_ok = false) { - this.is_parameter = is_parameter; - this.duplicates_ok = duplicates_ok; - this.parameters = new Set(); - this.duplicate = null; - this.default_assignment = false; - this.spread = false; - this.strict_mode = !!strict; - } - add_parameter(token) { - if (this.parameters.has(token.value)) { - if (this.duplicate === null) { - this.duplicate = token; - } - this.check_strict(); - } else { - this.parameters.add(token.value); - if (this.is_parameter) { - switch (token.value) { - case "arguments": - case "eval": - case "yield": - if (this.strict_mode) { - token_error(token, "Unexpected " + token.value + " identifier as parameter inside strict mode"); - } - break; - default: - if (RESERVED_WORDS.has(token.value)) { - unexpected(); - } - } - } - } - } - mark_default_assignment(token) { - if (this.default_assignment === false) { - this.default_assignment = token; - } - } - mark_spread(token) { - if (this.spread === false) { - this.spread = token; - } - } - mark_strict_mode() { - this.strict_mode = true; - } - is_strict() { - return this.default_assignment !== false || this.spread !== false || this.strict_mode; - } - check_strict() { - if (this.is_strict() && this.duplicate !== null && !this.duplicates_ok) { - token_error(this.duplicate, "Parameter " + this.duplicate.value + " was used already"); - } - } - } - - function parameters(params) { - var used_parameters = new UsedParametersTracker(true, S.input.has_directive("use strict")); - - expect("("); - - while (!is("punc", ")")) { - var param = parameter(used_parameters); - params.push(param); - - if (!is("punc", ")")) { - expect(","); - } - - if (param instanceof AST_Expansion) { - break; - } - } - - next(); - } - - function parameter(used_parameters, symbol_type) { - var param; - var expand = false; - if (used_parameters === undefined) { - used_parameters = new UsedParametersTracker(true, S.input.has_directive("use strict")); - } - if (is("expand", "...")) { - expand = S.token; - used_parameters.mark_spread(S.token); - next(); - } - param = binding_element(used_parameters, symbol_type); - - if (is("operator", "=") && expand === false) { - used_parameters.mark_default_assignment(S.token); - next(); - param = new AST_DefaultAssign({ - start: param.start, - left: param, - operator: "=", - right: expression(false), - end: S.token - }); - } - - if (expand !== false) { - if (!is("punc", ")")) { - unexpected(); - } - param = new AST_Expansion({ - start: expand, - expression: param, - end: expand - }); - } - used_parameters.check_strict(); - - return param; - } - - function binding_element(used_parameters, symbol_type) { - var elements = []; - var first = true; - var is_expand = false; - var expand_token; - var first_token = S.token; - if (used_parameters === undefined) { - const strict = S.input.has_directive("use strict"); - const duplicates_ok = symbol_type === AST_SymbolVar; - used_parameters = new UsedParametersTracker(false, strict, duplicates_ok); - } - symbol_type = symbol_type === undefined ? AST_SymbolFunarg : symbol_type; - if (is("punc", "[")) { - next(); - while (!is("punc", "]")) { - if (first) { - first = false; - } else { - expect(","); - } - - if (is("expand", "...")) { - is_expand = true; - expand_token = S.token; - used_parameters.mark_spread(S.token); - next(); - } - if (is("punc")) { - switch (S.token.value) { - case ",": - elements.push(new AST_Hole({ - start: S.token, - end: S.token - })); - continue; - case "]": // Trailing comma after last element - break; - case "[": - case "{": - elements.push(binding_element(used_parameters, symbol_type)); - break; - default: - unexpected(); - } - } else if (is("name")) { - used_parameters.add_parameter(S.token); - elements.push(as_symbol(symbol_type)); - } else { - croak("Invalid function parameter"); - } - if (is("operator", "=") && is_expand === false) { - used_parameters.mark_default_assignment(S.token); - next(); - elements[elements.length - 1] = new AST_DefaultAssign({ - start: elements[elements.length - 1].start, - left: elements[elements.length - 1], - operator: "=", - right: expression(false), - end: S.token - }); - } - if (is_expand) { - if (!is("punc", "]")) { - croak("Rest element must be last element"); - } - elements[elements.length - 1] = new AST_Expansion({ - start: expand_token, - expression: elements[elements.length - 1], - end: expand_token - }); - } - } - expect("]"); - used_parameters.check_strict(); - return new AST_Destructuring({ - start: first_token, - names: elements, - is_array: true, - end: prev() - }); - } else if (is("punc", "{")) { - next(); - while (!is("punc", "}")) { - if (first) { - first = false; - } else { - expect(","); - } - if (is("expand", "...")) { - is_expand = true; - expand_token = S.token; - used_parameters.mark_spread(S.token); - next(); - } - if (is("name") && (is_token(peek(), "punc") || is_token(peek(), "operator")) && [",", "}", "="].includes(peek().value)) { - used_parameters.add_parameter(S.token); - var start = prev(); - var value = as_symbol(symbol_type); - if (is_expand) { - elements.push(new AST_Expansion({ - start: expand_token, - expression: value, - end: value.end, - })); - } else { - elements.push(new AST_ObjectKeyVal({ - start: start, - key: value.name, - value: value, - end: value.end, - })); - } - } else if (is("punc", "}")) { - continue; // Allow trailing hole - } else { - var property_token = S.token; - var property = as_property_name(); - if (property === null) { - unexpected(prev()); - } else if (prev().type === "name" && !is("punc", ":")) { - elements.push(new AST_ObjectKeyVal({ - start: prev(), - key: property, - value: new symbol_type({ - start: prev(), - name: property, - end: prev() - }), - end: prev() - })); - } else { - expect(":"); - elements.push(new AST_ObjectKeyVal({ - start: property_token, - quote: property_token.quote, - key: property, - value: binding_element(used_parameters, symbol_type), - end: prev() - })); - } - } - if (is_expand) { - if (!is("punc", "}")) { - croak("Rest element must be last element"); - } - } else if (is("operator", "=")) { - used_parameters.mark_default_assignment(S.token); - next(); - elements[elements.length - 1].value = new AST_DefaultAssign({ - start: elements[elements.length - 1].value.start, - left: elements[elements.length - 1].value, - operator: "=", - right: expression(false), - end: S.token - }); - } - } - expect("}"); - used_parameters.check_strict(); - return new AST_Destructuring({ - start: first_token, - names: elements, - is_array: false, - end: prev() - }); - } else if (is("name")) { - used_parameters.add_parameter(S.token); - return as_symbol(symbol_type); - } else { - croak("Invalid function parameter"); - } - } - - function params_or_seq_(allow_arrows, maybe_sequence) { - var spread_token; - var invalid_sequence; - var trailing_comma; - var a = []; - expect("("); - while (!is("punc", ")")) { - if (spread_token) unexpected(spread_token); - if (is("expand", "...")) { - spread_token = S.token; - if (maybe_sequence) invalid_sequence = S.token; - next(); - a.push(new AST_Expansion({ - start: prev(), - expression: expression(), - end: S.token, - })); - } else { - a.push(expression()); - } - if (!is("punc", ")")) { - expect(","); - if (is("punc", ")")) { - trailing_comma = prev(); - if (maybe_sequence) invalid_sequence = trailing_comma; - } - } - } - expect(")"); - if (allow_arrows && is("arrow", "=>")) { - if (spread_token && trailing_comma) unexpected(trailing_comma); - } else if (invalid_sequence) { - unexpected(invalid_sequence); - } - return a; - } - - function _function_body(block, generator, is_async, name, args) { - var loop = S.in_loop; - var labels = S.labels; - var current_generator = S.in_generator; - var current_async = S.in_async; - ++S.in_function; - if (generator) - S.in_generator = S.in_function; - if (is_async) - S.in_async = S.in_function; - if (args) parameters(args); - if (block) - S.in_directives = true; - S.in_loop = 0; - S.labels = []; - if (block) { - S.input.push_directives_stack(); - var a = block_(); - if (name) _verify_symbol(name); - if (args) args.forEach(_verify_symbol); - S.input.pop_directives_stack(); - } else { - var a = [new AST_Return({ - start: S.token, - value: expression(false), - end: S.token - })]; - } - --S.in_function; - S.in_loop = loop; - S.labels = labels; - S.in_generator = current_generator; - S.in_async = current_async; - return a; - } - - function _await_expression() { - // Previous token must be "await" and not be interpreted as an identifier - if (!can_await()) { - croak("Unexpected await expression outside async function", - S.prev.line, S.prev.col, S.prev.pos); - } - // the await expression is parsed as a unary expression in Babel - return new AST_Await({ - start: prev(), - end: S.token, - expression : maybe_unary(true), - }); - } - - function _yield_expression() { - // Previous token must be keyword yield and not be interpret as an identifier - if (!is_in_generator()) { - croak("Unexpected yield expression outside generator function", - S.prev.line, S.prev.col, S.prev.pos); - } - var start = S.token; - var star = false; - var has_expression = true; - - // Attempt to get expression or star (and then the mandatory expression) - // behind yield on the same line. - // - // If nothing follows on the same line of the yieldExpression, - // it should default to the value `undefined` for yield to return. - // In that case, the `undefined` stored as `null` in ast. - // - // Note 1: It isn't allowed for yield* to close without an expression - // Note 2: If there is a nlb between yield and star, it is interpret as - // yield <explicit undefined> <inserted automatic semicolon> * - if (can_insert_semicolon() || - (is("punc") && PUNC_AFTER_EXPRESSION.has(S.token.value))) { - has_expression = false; - - } else if (is("operator", "*")) { - star = true; - next(); - } - - return new AST_Yield({ - start : start, - is_star : star, - expression : has_expression ? expression() : null, - end : prev() - }); - } - - function if_() { - var cond = parenthesised(), body = statement(false, false, true), belse = null; - if (is("keyword", "else")) { - next(); - belse = statement(false, false, true); - } - return new AST_If({ - condition : cond, - body : body, - alternative : belse - }); - } - - function block_() { - expect("{"); - var a = []; - while (!is("punc", "}")) { - if (is("eof")) unexpected(); - a.push(statement()); - } - next(); - return a; - } - - function switch_body_() { - expect("{"); - var a = [], cur = null, branch = null, tmp; - while (!is("punc", "}")) { - if (is("eof")) unexpected(); - if (is("keyword", "case")) { - if (branch) branch.end = prev(); - cur = []; - branch = new AST_Case({ - start : (tmp = S.token, next(), tmp), - expression : expression(true), - body : cur - }); - a.push(branch); - expect(":"); - } else if (is("keyword", "default")) { - if (branch) branch.end = prev(); - cur = []; - branch = new AST_Default({ - start : (tmp = S.token, next(), expect(":"), tmp), - body : cur - }); - a.push(branch); - } else { - if (!cur) unexpected(); - cur.push(statement()); - } - } - if (branch) branch.end = prev(); - next(); - return a; - } - - function try_() { - var body, bcatch = null, bfinally = null; - body = new AST_TryBlock({ - start : S.token, - body : block_(), - end : prev(), - }); - if (is("keyword", "catch")) { - var start = S.token; - next(); - if (is("punc", "{")) { - var name = null; - } else { - expect("("); - var name = parameter(undefined, AST_SymbolCatch); - expect(")"); - } - bcatch = new AST_Catch({ - start : start, - argname : name, - body : block_(), - end : prev() - }); - } - if (is("keyword", "finally")) { - var start = S.token; - next(); - bfinally = new AST_Finally({ - start : start, - body : block_(), - end : prev() - }); - } - if (!bcatch && !bfinally) - croak("Missing catch/finally blocks"); - return new AST_Try({ - body : body, - bcatch : bcatch, - bfinally : bfinally - }); - } - - /** - * var - * vardef1 = 2, - * vardef2 = 3; - */ - function vardefs(no_in, kind) { - var var_defs = []; - var def; - for (;;) { - var sym_type = - kind === "var" ? AST_SymbolVar : - kind === "const" ? AST_SymbolConst : - kind === "let" ? AST_SymbolLet : null; - // var { a } = b - if (is("punc", "{") || is("punc", "[")) { - def = new AST_VarDef({ - start: S.token, - name: binding_element(undefined, sym_type), - value: is("operator", "=") ? (expect_token("operator", "="), expression(false, no_in)) : null, - end: prev() - }); - } else { - def = new AST_VarDef({ - start : S.token, - name : as_symbol(sym_type), - value : is("operator", "=") - ? (next(), expression(false, no_in)) - : !no_in && kind === "const" - ? croak("Missing initializer in const declaration") : null, - end : prev() - }); - if (def.name.name == "import") croak("Unexpected token: import"); - } - var_defs.push(def); - if (!is("punc", ",")) - break; - next(); - } - return var_defs; - } - - var var_ = function(no_in) { - return new AST_Var({ - start : prev(), - definitions : vardefs(no_in, "var"), - end : prev() - }); - }; - - var let_ = function(no_in) { - return new AST_Let({ - start : prev(), - definitions : vardefs(no_in, "let"), - end : prev() - }); - }; - - var const_ = function(no_in) { - return new AST_Const({ - start : prev(), - definitions : vardefs(no_in, "const"), - end : prev() - }); - }; - - var new_ = function(allow_calls) { - var start = S.token; - expect_token("operator", "new"); - if (is("punc", ".")) { - next(); - expect_token("name", "target"); - return subscripts(new AST_NewTarget({ - start : start, - end : prev() - }), allow_calls); - } - var newexp = expr_atom(false), args; - if (is("punc", "(")) { - next(); - args = expr_list(")", true); - } else { - args = []; - } - var call = new AST_New({ - start : start, - expression : newexp, - args : args, - end : prev() - }); - annotate(call); - return subscripts(call, allow_calls); - }; - - function as_atom_node() { - var tok = S.token, ret; - switch (tok.type) { - case "name": - ret = _make_symbol(AST_SymbolRef); - break; - case "num": - ret = new AST_Number({ - start: tok, - end: tok, - value: tok.value, - raw: LATEST_RAW - }); - break; - case "big_int": - ret = new AST_BigInt({ start: tok, end: tok, value: tok.value }); - break; - case "string": - ret = new AST_String({ - start : tok, - end : tok, - value : tok.value, - quote : tok.quote - }); - annotate(ret); - break; - case "regexp": - const [_, source, flags] = tok.value.match(/^\/(.*)\/(\w*)$/); - - ret = new AST_RegExp({ start: tok, end: tok, value: { source, flags } }); - break; - case "atom": - switch (tok.value) { - case "false": - ret = new AST_False({ start: tok, end: tok }); - break; - case "true": - ret = new AST_True({ start: tok, end: tok }); - break; - case "null": - ret = new AST_Null({ start: tok, end: tok }); - break; - } - break; - } - next(); - return ret; - } - - function to_fun_args(ex, default_seen_above) { - var insert_default = function(ex, default_value) { - if (default_value) { - return new AST_DefaultAssign({ - start: ex.start, - left: ex, - operator: "=", - right: default_value, - end: default_value.end - }); - } - return ex; - }; - if (ex instanceof AST_Object) { - return insert_default(new AST_Destructuring({ - start: ex.start, - end: ex.end, - is_array: false, - names: ex.properties.map(prop => to_fun_args(prop)) - }), default_seen_above); - } else if (ex instanceof AST_ObjectKeyVal) { - ex.value = to_fun_args(ex.value); - return insert_default(ex, default_seen_above); - } else if (ex instanceof AST_Hole) { - return ex; - } else if (ex instanceof AST_Destructuring) { - ex.names = ex.names.map(name => to_fun_args(name)); - return insert_default(ex, default_seen_above); - } else if (ex instanceof AST_SymbolRef) { - return insert_default(new AST_SymbolFunarg({ - name: ex.name, - start: ex.start, - end: ex.end - }), default_seen_above); - } else if (ex instanceof AST_Expansion) { - ex.expression = to_fun_args(ex.expression); - return insert_default(ex, default_seen_above); - } else if (ex instanceof AST_Array) { - return insert_default(new AST_Destructuring({ - start: ex.start, - end: ex.end, - is_array: true, - names: ex.elements.map(elm => to_fun_args(elm)) - }), default_seen_above); - } else if (ex instanceof AST_Assign) { - return insert_default(to_fun_args(ex.left, ex.right), default_seen_above); - } else if (ex instanceof AST_DefaultAssign) { - ex.left = to_fun_args(ex.left); - return ex; - } else { - croak("Invalid function parameter", ex.start.line, ex.start.col); - } - } - - var expr_atom = function(allow_calls, allow_arrows) { - if (is("operator", "new")) { - return new_(allow_calls); - } - if (is("name", "import") && is_token(peek(), "punc", ".")) { - return import_meta(allow_calls); - } - var start = S.token; - var peeked; - var async = is("name", "async") - && (peeked = peek()).value != "[" - && peeked.type != "arrow" - && as_atom_node(); - if (is("punc")) { - switch (S.token.value) { - case "(": - if (async && !allow_calls) break; - var exprs = params_or_seq_(allow_arrows, !async); - if (allow_arrows && is("arrow", "=>")) { - return arrow_function(start, exprs.map(e => to_fun_args(e)), !!async); - } - var ex = async ? new AST_Call({ - expression: async, - args: exprs - }) : to_expr_or_sequence(start, exprs); - if (ex.start) { - const outer_comments_before = start.comments_before.length; - outer_comments_before_counts.set(start, outer_comments_before); - ex.start.comments_before.unshift(...start.comments_before); - start.comments_before = ex.start.comments_before; - if (outer_comments_before == 0 && start.comments_before.length > 0) { - var comment = start.comments_before[0]; - if (!comment.nlb) { - comment.nlb = start.nlb; - start.nlb = false; - } - } - start.comments_after = ex.start.comments_after; - } - ex.start = start; - var end = prev(); - if (ex.end) { - end.comments_before = ex.end.comments_before; - ex.end.comments_after.push(...end.comments_after); - end.comments_after = ex.end.comments_after; - } - ex.end = end; - if (ex instanceof AST_Call) annotate(ex); - return subscripts(ex, allow_calls); - case "[": - return subscripts(array_(), allow_calls); - case "{": - return subscripts(object_or_destructuring_(), allow_calls); - } - if (!async) unexpected(); - } - if (allow_arrows && is("name") && is_token(peek(), "arrow")) { - var param = new AST_SymbolFunarg({ - name: S.token.value, - start: start, - end: start, - }); - next(); - return arrow_function(start, [param], !!async); - } - if (is("keyword", "function")) { - next(); - var func = function_(AST_Function, false, !!async); - func.start = start; - func.end = prev(); - return subscripts(func, allow_calls); - } - if (async) return subscripts(async, allow_calls); - if (is("keyword", "class")) { - next(); - var cls = class_(AST_ClassExpression); - cls.start = start; - cls.end = prev(); - return subscripts(cls, allow_calls); - } - if (is("template_head")) { - return subscripts(template_string(), allow_calls); - } - if (ATOMIC_START_TOKEN.has(S.token.type)) { - return subscripts(as_atom_node(), allow_calls); - } - unexpected(); - }; - - function template_string() { - var segments = [], start = S.token; - - segments.push(new AST_TemplateSegment({ - start: S.token, - raw: TEMPLATE_RAWS.get(S.token), - value: S.token.value, - end: S.token - })); - - while (!S.token.template_end) { - next(); - handle_regexp(); - segments.push(expression(true)); - - segments.push(new AST_TemplateSegment({ - start: S.token, - raw: TEMPLATE_RAWS.get(S.token), - value: S.token.value, - end: S.token - })); - } - next(); - - return new AST_TemplateString({ - start: start, - segments: segments, - end: S.token - }); - } - - function expr_list(closing, allow_trailing_comma, allow_empty) { - var first = true, a = []; - while (!is("punc", closing)) { - if (first) first = false; else expect(","); - if (allow_trailing_comma && is("punc", closing)) break; - if (is("punc", ",") && allow_empty) { - a.push(new AST_Hole({ start: S.token, end: S.token })); - } else if (is("expand", "...")) { - next(); - a.push(new AST_Expansion({start: prev(), expression: expression(),end: S.token})); - } else { - a.push(expression(false)); - } - } - next(); - return a; - } - - var array_ = embed_tokens(function() { - expect("["); - return new AST_Array({ - elements: expr_list("]", !options.strict, true) - }); - }); - - var create_accessor = embed_tokens((is_generator, is_async) => { - return function_(AST_Accessor, is_generator, is_async); - }); - - var object_or_destructuring_ = embed_tokens(function object_or_destructuring_() { - var start = S.token, first = true, a = []; - expect("{"); - while (!is("punc", "}")) { - if (first) first = false; else expect(","); - if (!options.strict && is("punc", "}")) - // allow trailing comma - break; - - start = S.token; - if (start.type == "expand") { - next(); - a.push(new AST_Expansion({ - start: start, - expression: expression(false), - end: prev(), - })); - continue; - } - if(is("privatename")) { - croak("private fields are not allowed in an object"); - } - var name = as_property_name(); - var value; - - // Check property and fetch value - if (!is("punc", ":")) { - var concise = concise_method_or_getset(name, start); - if (concise) { - a.push(concise); - continue; - } - - value = new AST_SymbolRef({ - start: prev(), - name: name, - end: prev() - }); - } else if (name === null) { - unexpected(prev()); - } else { - next(); // `:` - see first condition - value = expression(false); - } - - // Check for default value and alter value accordingly if necessary - if (is("operator", "=")) { - next(); - value = new AST_Assign({ - start: start, - left: value, - operator: "=", - right: expression(false), - logical: false, - end: prev() - }); - } - - // Create property - const kv = new AST_ObjectKeyVal({ - start: start, - quote: start.quote, - key: name instanceof AST_Node ? name : "" + name, - value: value, - end: prev() - }); - a.push(annotate(kv)); - } - next(); - return new AST_Object({ properties: a }); - }); - - function class_(KindOfClass, is_export_default) { - var start, method, class_name, extends_, a = []; - - S.input.push_directives_stack(); // Push directive stack, but not scope stack - S.input.add_directive("use strict"); - - if (S.token.type == "name" && S.token.value != "extends") { - class_name = as_symbol(KindOfClass === AST_DefClass ? AST_SymbolDefClass : AST_SymbolClass); - } - - if (KindOfClass === AST_DefClass && !class_name) { - if (is_export_default) { - KindOfClass = AST_ClassExpression; - } else { - unexpected(); - } - } - - if (S.token.value == "extends") { - next(); - extends_ = expression(true); - } - - expect("{"); - // mark in class feild, - const save_in_class = S.in_class; - S.in_class = true; - while (is("punc", ";")) { next(); } // Leading semicolons are okay in class bodies. - while (!is("punc", "}")) { - start = S.token; - method = concise_method_or_getset(as_property_name(), start, true); - if (!method) { unexpected(); } - a.push(method); - while (is("punc", ";")) { next(); } - } - // mark in class feild, - S.in_class = save_in_class; - - S.input.pop_directives_stack(); - - next(); - - return new KindOfClass({ - start: start, - name: class_name, - extends: extends_, - properties: a, - end: prev(), - }); - } - - function concise_method_or_getset(name, start, is_class) { - const get_symbol_ast = (name, SymbolClass = AST_SymbolMethod) => { - if (typeof name === "string" || typeof name === "number") { - return new SymbolClass({ - start, - name: "" + name, - end: prev() - }); - } else if (name === null) { - unexpected(); - } - return name; - }; - - const is_not_method_start = () => - !is("punc", "(") && !is("punc", ",") && !is("punc", "}") && !is("punc", ";") && !is("operator", "="); - - var is_async = false; - var is_static = false; - var is_generator = false; - var is_private = false; - var accessor_type = null; - - if (is_class && name === "static" && is_not_method_start()) { - const static_block = class_static_block(); - if (static_block != null) { - return static_block; - } - is_static = true; - name = as_property_name(); - } - if (name === "async" && is_not_method_start()) { - is_async = true; - name = as_property_name(); - } - if (prev().type === "operator" && prev().value === "*") { - is_generator = true; - name = as_property_name(); - } - if ((name === "get" || name === "set") && is_not_method_start()) { - accessor_type = name; - name = as_property_name(); - } - if (prev().type === "privatename") { - is_private = true; - } - - const property_token = prev(); - - if (accessor_type != null) { - if (!is_private) { - const AccessorClass = accessor_type === "get" - ? AST_ObjectGetter - : AST_ObjectSetter; - - name = get_symbol_ast(name); - return annotate(new AccessorClass({ - start, - static: is_static, - key: name, - quote: name instanceof AST_SymbolMethod ? property_token.quote : undefined, - value: create_accessor(), - end: prev() - })); - } else { - const AccessorClass = accessor_type === "get" - ? AST_PrivateGetter - : AST_PrivateSetter; - - return annotate(new AccessorClass({ - start, - static: is_static, - key: get_symbol_ast(name), - value: create_accessor(), - end: prev(), - })); - } - } - - if (is("punc", "(")) { - name = get_symbol_ast(name); - const AST_MethodVariant = is_private - ? AST_PrivateMethod - : AST_ConciseMethod; - var node = new AST_MethodVariant({ - start : start, - static : is_static, - is_generator: is_generator, - async : is_async, - key : name, - quote : name instanceof AST_SymbolMethod ? - property_token.quote : undefined, - value : create_accessor(is_generator, is_async), - end : prev() - }); - return annotate(node); - } - - if (is_class) { - const key = get_symbol_ast(name, AST_SymbolClassProperty); - const quote = key instanceof AST_SymbolClassProperty - ? property_token.quote - : undefined; - const AST_ClassPropertyVariant = is_private - ? AST_ClassPrivateProperty - : AST_ClassProperty; - if (is("operator", "=")) { - next(); - return annotate( - new AST_ClassPropertyVariant({ - start, - static: is_static, - quote, - key, - value: expression(false), - end: prev() - }) - ); - } else if ( - is("name") - || is("privatename") - || is("operator", "*") - || is("punc", ";") - || is("punc", "}") - ) { - return annotate( - new AST_ClassPropertyVariant({ - start, - static: is_static, - quote, - key, - end: prev() - }) - ); - } - } - } - - function class_static_block() { - if (!is("punc", "{")) { - return null; - } - - const start = S.token; - const body = []; - - next(); - - while (!is("punc", "}")) { - body.push(statement()); - } - - next(); - - return new AST_ClassStaticBlock({ start, body, end: prev() }); - } - - function maybe_import_assertion() { - if (is("name", "assert") && !has_newline_before(S.token)) { - next(); - return object_or_destructuring_(); - } - return null; - } - - function import_statement() { - var start = prev(); - - var imported_name; - var imported_names; - if (is("name")) { - imported_name = as_symbol(AST_SymbolImport); - } - - if (is("punc", ",")) { - next(); - } - - imported_names = map_names(true); - - if (imported_names || imported_name) { - expect_token("name", "from"); - } - var mod_str = S.token; - if (mod_str.type !== "string") { - unexpected(); - } - next(); - - const assert_clause = maybe_import_assertion(); - - return new AST_Import({ - start, - imported_name, - imported_names, - module_name: new AST_String({ - start: mod_str, - value: mod_str.value, - quote: mod_str.quote, - end: mod_str, - }), - assert_clause, - end: S.token, - }); - } - - function import_meta(allow_calls) { - var start = S.token; - expect_token("name", "import"); - expect_token("punc", "."); - expect_token("name", "meta"); - return subscripts(new AST_ImportMeta({ - start: start, - end: prev() - }), allow_calls); - } - - function map_name(is_import) { - function make_symbol(type, quote) { - return new type({ - name: as_property_name(), - quote: quote || undefined, - start: prev(), - end: prev() - }); - } - - var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign; - var type = is_import ? AST_SymbolImport : AST_SymbolExport; - var start = S.token; - var foreign_name; - var name; - - if (is_import) { - foreign_name = make_symbol(foreign_type, start.quote); - } else { - name = make_symbol(type, start.quote); - } - if (is("name", "as")) { - next(); // The "as" word - if (is_import) { - name = make_symbol(type); - } else { - foreign_name = make_symbol(foreign_type, S.token.quote); - } - } else if (is_import) { - name = new type(foreign_name); - } else { - foreign_name = new foreign_type(name); - } - - return new AST_NameMapping({ - start: start, - foreign_name: foreign_name, - name: name, - end: prev(), - }); - } - - function map_nameAsterisk(is_import, import_or_export_foreign_name) { - var foreign_type = is_import ? AST_SymbolImportForeign : AST_SymbolExportForeign; - var type = is_import ? AST_SymbolImport : AST_SymbolExport; - var start = S.token; - var name, foreign_name; - var end = prev(); - - if (is_import) { - name = import_or_export_foreign_name; - } else { - foreign_name = import_or_export_foreign_name; - } - - name = name || new type({ - start: start, - name: "*", - end: end, - }); - - foreign_name = foreign_name || new foreign_type({ - start: start, - name: "*", - end: end, - }); - - return new AST_NameMapping({ - start: start, - foreign_name: foreign_name, - name: name, - end: end, - }); - } - - function map_names(is_import) { - var names; - if (is("punc", "{")) { - next(); - names = []; - while (!is("punc", "}")) { - names.push(map_name(is_import)); - if (is("punc", ",")) { - next(); - } - } - next(); - } else if (is("operator", "*")) { - var name; - next(); - if (is("name", "as")) { - next(); // The "as" word - name = is_import ? as_symbol(AST_SymbolImport) : as_symbol_or_string(AST_SymbolExportForeign); - } - names = [map_nameAsterisk(is_import, name)]; - } - return names; - } - - function export_statement() { - var start = S.token; - var is_default; - var exported_names; - - if (is("keyword", "default")) { - is_default = true; - next(); - } else if (exported_names = map_names(false)) { - if (is("name", "from")) { - next(); - - var mod_str = S.token; - if (mod_str.type !== "string") { - unexpected(); - } - next(); - - const assert_clause = maybe_import_assertion(); - - return new AST_Export({ - start: start, - is_default: is_default, - exported_names: exported_names, - module_name: new AST_String({ - start: mod_str, - value: mod_str.value, - quote: mod_str.quote, - end: mod_str, - }), - end: prev(), - assert_clause - }); - } else { - return new AST_Export({ - start: start, - is_default: is_default, - exported_names: exported_names, - end: prev(), - }); - } - } - - var node; - var exported_value; - var exported_definition; - if (is("punc", "{") - || is_default - && (is("keyword", "class") || is("keyword", "function")) - && is_token(peek(), "punc")) { - exported_value = expression(false); - semicolon(); - } else if ((node = statement(is_default)) instanceof AST_Definitions && is_default) { - unexpected(node.start); - } else if ( - node instanceof AST_Definitions - || node instanceof AST_Defun - || node instanceof AST_DefClass - ) { - exported_definition = node; - } else if ( - node instanceof AST_ClassExpression - || node instanceof AST_Function - ) { - exported_value = node; - } else if (node instanceof AST_SimpleStatement) { - exported_value = node.body; - } else { - unexpected(node.start); - } - - return new AST_Export({ - start: start, - is_default: is_default, - exported_value: exported_value, - exported_definition: exported_definition, - end: prev(), - assert_clause: null - }); - } - - function as_property_name() { - var tmp = S.token; - switch (tmp.type) { - case "punc": - if (tmp.value === "[") { - next(); - var ex = expression(false); - expect("]"); - return ex; - } else unexpected(tmp); - case "operator": - if (tmp.value === "*") { - next(); - return null; - } - if (!["delete", "in", "instanceof", "new", "typeof", "void"].includes(tmp.value)) { - unexpected(tmp); - } - /* falls through */ - case "name": - case "privatename": - case "string": - case "num": - case "big_int": - case "keyword": - case "atom": - next(); - return tmp.value; - default: - unexpected(tmp); - } - } - - function as_name() { - var tmp = S.token; - if (tmp.type != "name" && tmp.type != "privatename") unexpected(); - next(); - return tmp.value; - } - - function _make_symbol(type) { - var name = S.token.value; - return new (name == "this" ? AST_This : - name == "super" ? AST_Super : - type)({ - name : String(name), - start : S.token, - end : S.token - }); - } - - function _verify_symbol(sym) { - var name = sym.name; - if (is_in_generator() && name == "yield") { - token_error(sym.start, "Yield cannot be used as identifier inside generators"); - } - if (S.input.has_directive("use strict")) { - if (name == "yield") { - token_error(sym.start, "Unexpected yield identifier inside strict mode"); - } - if (sym instanceof AST_SymbolDeclaration && (name == "arguments" || name == "eval")) { - token_error(sym.start, "Unexpected " + name + " in strict mode"); - } - } - } - - function as_symbol(type, noerror) { - if (!is("name")) { - if (!noerror) croak("Name expected"); - return null; - } - var sym = _make_symbol(type); - _verify_symbol(sym); - next(); - return sym; - } - - function as_symbol_or_string(type) { - if (!is("name")) { - if (!is("string")) { - croak("Name or string expected"); - } - var tok = S.token; - var ret = new type({ - start : tok, - end : tok, - name : tok.value, - quote : tok.quote - }); - next(); - return ret; - } - var sym = _make_symbol(type); - _verify_symbol(sym); - next(); - return sym; - } - - // Annotate AST_Call, AST_Lambda or AST_New with the special comments - function annotate(node, before_token = node.start) { - var comments = before_token.comments_before; - const comments_outside_parens = outer_comments_before_counts.get(before_token); - var i = comments_outside_parens != null ? comments_outside_parens : comments.length; - while (--i >= 0) { - var comment = comments[i]; - if (/[@#]__/.test(comment.value)) { - if (/[@#]__PURE__/.test(comment.value)) { - set_annotation(node, _PURE); - break; - } - if (/[@#]__INLINE__/.test(comment.value)) { - set_annotation(node, _INLINE); - break; - } - if (/[@#]__NOINLINE__/.test(comment.value)) { - set_annotation(node, _NOINLINE); - break; - } - if (/[@#]__KEY__/.test(comment.value)) { - set_annotation(node, _KEY); - break; - } - if (/[@#]__MANGLE_PROP__/.test(comment.value)) { - set_annotation(node, _MANGLEPROP); - break; - } - } - } - return node; - } - - var subscripts = function(expr, allow_calls, is_chain) { - var start = expr.start; - if (is("punc", ".")) { - next(); - if(is("privatename") && !S.in_class) - croak("Private field must be used in an enclosing class"); - const AST_DotVariant = is("privatename") ? AST_DotHash : AST_Dot; - return annotate(subscripts(new AST_DotVariant({ - start : start, - expression : expr, - optional : false, - property : as_name(), - end : prev() - }), allow_calls, is_chain)); - } - if (is("punc", "[")) { - next(); - var prop = expression(true); - expect("]"); - return annotate(subscripts(new AST_Sub({ - start : start, - expression : expr, - optional : false, - property : prop, - end : prev() - }), allow_calls, is_chain)); - } - if (allow_calls && is("punc", "(")) { - next(); - var call = new AST_Call({ - start : start, - expression : expr, - optional : false, - args : call_args(), - end : prev() - }); - annotate(call); - return subscripts(call, true, is_chain); - } - - if (is("punc", "?.")) { - next(); - - let chain_contents; - - if (allow_calls && is("punc", "(")) { - next(); - - const call = new AST_Call({ - start, - optional: true, - expression: expr, - args: call_args(), - end: prev() - }); - annotate(call); - - chain_contents = subscripts(call, true, true); - } else if (is("name") || is("privatename")) { - if(is("privatename") && !S.in_class) - croak("Private field must be used in an enclosing class"); - const AST_DotVariant = is("privatename") ? AST_DotHash : AST_Dot; - chain_contents = annotate(subscripts(new AST_DotVariant({ - start, - expression: expr, - optional: true, - property: as_name(), - end: prev() - }), allow_calls, true)); - } else if (is("punc", "[")) { - next(); - const property = expression(true); - expect("]"); - chain_contents = annotate(subscripts(new AST_Sub({ - start, - expression: expr, - optional: true, - property, - end: prev() - }), allow_calls, true)); - } - - if (!chain_contents) unexpected(); - - if (chain_contents instanceof AST_Chain) return chain_contents; - - return new AST_Chain({ - start, - expression: chain_contents, - end: prev() - }); - } - - if (is("template_head")) { - if (is_chain) { - // a?.b`c` is a syntax error - unexpected(); - } - - return subscripts(new AST_PrefixedTemplateString({ - start: start, - prefix: expr, - template_string: template_string(), - end: prev() - }), allow_calls); - } - return expr; - }; - - function call_args() { - var args = []; - while (!is("punc", ")")) { - if (is("expand", "...")) { - next(); - args.push(new AST_Expansion({ - start: prev(), - expression: expression(false), - end: prev() - })); - } else { - args.push(expression(false)); - } - if (!is("punc", ")")) { - expect(","); - } - } - next(); - return args; - } - - var maybe_unary = function(allow_calls, allow_arrows) { - var start = S.token; - if (start.type == "name" && start.value == "await" && can_await()) { - next(); - return _await_expression(); - } - if (is("operator") && UNARY_PREFIX.has(start.value)) { - next(); - handle_regexp(); - var ex = make_unary(AST_UnaryPrefix, start, maybe_unary(allow_calls)); - ex.start = start; - ex.end = prev(); - return ex; - } - var val = expr_atom(allow_calls, allow_arrows); - while (is("operator") && UNARY_POSTFIX.has(S.token.value) && !has_newline_before(S.token)) { - if (val instanceof AST_Arrow) unexpected(); - val = make_unary(AST_UnaryPostfix, S.token, val); - val.start = start; - val.end = S.token; - next(); - } - return val; - }; - - function make_unary(ctor, token, expr) { - var op = token.value; - switch (op) { - case "++": - case "--": - if (!is_assignable(expr)) - croak("Invalid use of " + op + " operator", token.line, token.col, token.pos); - break; - case "delete": - if (expr instanceof AST_SymbolRef && S.input.has_directive("use strict")) - croak("Calling delete on expression not allowed in strict mode", expr.start.line, expr.start.col, expr.start.pos); - break; - } - return new ctor({ operator: op, expression: expr }); - } - - var expr_op = function(left, min_prec, no_in) { - var op = is("operator") ? S.token.value : null; - if (op == "in" && no_in) op = null; - if (op == "**" && left instanceof AST_UnaryPrefix - /* unary token in front not allowed - parenthesis required */ - && !is_token(left.start, "punc", "(") - && left.operator !== "--" && left.operator !== "++") - unexpected(left.start); - var prec = op != null ? PRECEDENCE[op] : null; - if (prec != null && (prec > min_prec || (op === "**" && min_prec === prec))) { - next(); - var right = expr_ops(no_in, prec, true); - return expr_op(new AST_Binary({ - start : left.start, - left : left, - operator : op, - right : right, - end : right.end - }), min_prec, no_in); - } - return left; - }; - - function expr_ops(no_in, min_prec, allow_calls, allow_arrows) { - // maybe_unary won't return us a AST_SymbolPrivateProperty - if (!no_in && min_prec < PRECEDENCE["in"] && is("privatename")) { - if(!S.in_class) { - croak("Private field must be used in an enclosing class"); - } - - const start = S.token; - const key = new AST_SymbolPrivateProperty({ - start, - name: start.value, - end: start - }); - next(); - expect_token("operator", "in"); - - const private_in = new AST_PrivateIn({ - start, - key, - value: expr_ops(no_in, PRECEDENCE["in"], true), - end: prev() - }); - - return expr_op(private_in, 0, no_in); - } else { - return expr_op(maybe_unary(allow_calls, allow_arrows), min_prec, no_in); - } - } - - var maybe_conditional = function(no_in) { - var start = S.token; - var expr = expr_ops(no_in, 0, true, true); - if (is("operator", "?")) { - next(); - var yes = expression(false); - expect(":"); - return new AST_Conditional({ - start : start, - condition : expr, - consequent : yes, - alternative : expression(false, no_in), - end : prev() - }); - } - return expr; - }; - - function is_assignable(expr) { - return expr instanceof AST_PropAccess || expr instanceof AST_SymbolRef; - } - - function to_destructuring(node) { - if (node instanceof AST_Object) { - node = new AST_Destructuring({ - start: node.start, - names: node.properties.map(to_destructuring), - is_array: false, - end: node.end - }); - } else if (node instanceof AST_Array) { - var names = []; - - for (var i = 0; i < node.elements.length; i++) { - // Only allow expansion as last element - if (node.elements[i] instanceof AST_Expansion) { - if (i + 1 !== node.elements.length) { - token_error(node.elements[i].start, "Spread must the be last element in destructuring array"); - } - node.elements[i].expression = to_destructuring(node.elements[i].expression); - } - - names.push(to_destructuring(node.elements[i])); - } - - node = new AST_Destructuring({ - start: node.start, - names: names, - is_array: true, - end: node.end - }); - } else if (node instanceof AST_ObjectProperty) { - node.value = to_destructuring(node.value); - } else if (node instanceof AST_Assign) { - node = new AST_DefaultAssign({ - start: node.start, - left: node.left, - operator: "=", - right: node.right, - end: node.end - }); - } - return node; - } - - // In ES6, AssignmentExpression can also be an ArrowFunction - var maybe_assign = function(no_in) { - handle_regexp(); - var start = S.token; - - if (start.type == "name" && start.value == "yield") { - if (is_in_generator()) { - next(); - return _yield_expression(); - } else if (S.input.has_directive("use strict")) { - token_error(S.token, "Unexpected yield identifier inside strict mode"); - } - } - - var left = maybe_conditional(no_in); - var val = S.token.value; - - if (is("operator") && ASSIGNMENT.has(val)) { - if (is_assignable(left) || (left = to_destructuring(left)) instanceof AST_Destructuring) { - next(); - - return new AST_Assign({ - start : start, - left : left, - operator : val, - right : maybe_assign(no_in), - logical : LOGICAL_ASSIGNMENT.has(val), - end : prev() - }); - } - croak("Invalid assignment"); - } - return left; - }; - - var to_expr_or_sequence = function(start, exprs) { - if (exprs.length === 1) { - return exprs[0]; - } else if (exprs.length > 1) { - return new AST_Sequence({ start, expressions: exprs, end: peek() }); - } else { - croak("Invalid parenthesized expression"); - } - }; - - var expression = function(commas, no_in) { - var start = S.token; - var exprs = []; - while (true) { - exprs.push(maybe_assign(no_in)); - if (!commas || !is("punc", ",")) break; - next(); - commas = true; - } - return to_expr_or_sequence(start, exprs); - }; - - function in_loop(cont) { - ++S.in_loop; - var ret = cont(); - --S.in_loop; - return ret; - } - - if (options.expression) { - return expression(true); - } - - return (function parse_toplevel() { - var start = S.token; - var body = []; - S.input.push_directives_stack(); - if (options.module) S.input.add_directive("use strict"); - while (!is("eof")) { - body.push(statement()); - } - S.input.pop_directives_stack(); - var end = prev(); - var toplevel = options.toplevel; - if (toplevel) { - toplevel.body = toplevel.body.concat(body); - toplevel.end = end; - } else { - toplevel = new AST_Toplevel({ start: start, body: body, end: end }); - } - TEMPLATE_RAWS = new Map(); - return toplevel; - })(); - -} - -export { - get_full_char_code, - get_full_char, - is_identifier_char, - is_basic_identifier_string, - is_identifier_string, - is_surrogate_pair_head, - is_surrogate_pair_tail, - js_error, - JS_Parse_Error, - parse, - PRECEDENCE, - ALL_RESERVED_WORDS, - tokenizer, -}; |