added hover prefixer

1 files changed, 640 insertions, 0 deletions

diff --git a/node_modules/terser/lib/compress/inline.js b/node_modules/terser/lib/compress/inline.js
new file mode 100644
index 00000000..34f090da
--- /dev/null
+++ b/node_modules/terser/lib/compress/inline.js
@@ -0,0 +1,640 @@
+/***********************************************************************
+
+  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>
+
+    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.
+
+ ***********************************************************************/
+
+import {
+    AST_Array,
+    AST_Assign,
+    AST_Block,
+    AST_Call,
+    AST_Catch,
+    AST_Class,
+    AST_ClassExpression,
+    AST_DefaultAssign,
+    AST_DefClass,
+    AST_Defun,
+    AST_Destructuring,
+    AST_EmptyStatement,
+    AST_Expansion,
+    AST_Export,
+    AST_Function,
+    AST_IterationStatement,
+    AST_Lambda,
+    AST_Node,
+    AST_Number,
+    AST_Object,
+    AST_ObjectKeyVal,
+    AST_PropAccess,
+    AST_Return,
+    AST_Scope,
+    AST_SimpleStatement,
+    AST_Statement,
+    AST_SymbolDefun,
+    AST_SymbolFunarg,
+    AST_SymbolLambda,
+    AST_SymbolRef,
+    AST_SymbolVar,
+    AST_This,
+    AST_Toplevel,
+    AST_UnaryPrefix,
+    AST_Undefined,
+    AST_Var,
+    AST_VarDef,
+
+    walk,
+
+    _INLINE,
+    _NOINLINE,
+    _PURE
+} from "../ast.js";
+import { make_node, has_annotation } from "../utils/index.js";
+import "../size.js";
+
+import "./evaluate.js";
+import "./drop-side-effect-free.js";
+import "./reduce-vars.js";
+import {
+    SQUEEZED,
+    INLINED,
+    UNUSED,
+
+    has_flag,
+    set_flag,
+} from "./compressor-flags.js";
+import {
+    make_sequence,
+    best_of,
+    make_node_from_constant,
+    identifier_atom,
+    is_empty,
+    is_func_expr,
+    is_iife_call,
+    is_reachable,
+    is_recursive_ref,
+    retain_top_func,
+} from "./common.js";
+
+/**
+ * Module that contains the inlining logic.
+ *
+ * @module
+ *
+ * The stars of the show are `inline_into_symbolref` and `inline_into_call`.
+ */
+
+function within_array_or_object_literal(compressor) {
+    var node, level = 0;
+    while (node = compressor.parent(level++)) {
+        if (node instanceof AST_Statement) return false;
+        if (node instanceof AST_Array
+            || node instanceof AST_ObjectKeyVal
+            || node instanceof AST_Object) {
+            return true;
+        }
+    }
+    return false;
+}
+
+function scope_encloses_variables_in_this_scope(scope, pulled_scope) {
+    for (const enclosed of pulled_scope.enclosed) {
+        if (pulled_scope.variables.has(enclosed.name)) {
+            continue;
+        }
+        const looked_up = scope.find_variable(enclosed.name);
+        if (looked_up) {
+            if (looked_up === enclosed) continue;
+            return true;
+        }
+    }
+    return false;
+}
+
+export function inline_into_symbolref(self, compressor) {
+    const parent = compressor.parent();
+
+    const def = self.definition();
+    const nearest_scope = compressor.find_scope();
+    if (compressor.top_retain && def.global && compressor.top_retain(def)) {
+        def.fixed = false;
+        def.single_use = false;
+        return self;
+    }
+
+    let fixed = self.fixed_value();
+    let single_use = def.single_use
+        && !(parent instanceof AST_Call
+            && (parent.is_callee_pure(compressor))
+                || has_annotation(parent, _NOINLINE))
+        && !(parent instanceof AST_Export
+            && fixed instanceof AST_Lambda
+            && fixed.name);
+
+    if (single_use && fixed instanceof AST_Node) {
+        single_use =
+            !fixed.has_side_effects(compressor)
+            && !fixed.may_throw(compressor);
+    }
+
+    if (fixed instanceof AST_Class && def.scope !== self.scope) {
+        return self;
+    }
+
+    if (single_use && (fixed instanceof AST_Lambda || fixed instanceof AST_Class)) {
+        if (retain_top_func(fixed, compressor)) {
+            single_use = false;
+        } else if (def.scope !== self.scope
+            && (def.escaped == 1
+                || has_flag(fixed, INLINED)
+                || within_array_or_object_literal(compressor)
+                || !compressor.option("reduce_funcs"))) {
+            single_use = false;
+        } else if (is_recursive_ref(compressor, def)) {
+            single_use = false;
+        } else if (def.scope !== self.scope || def.orig[0] instanceof AST_SymbolFunarg) {
+            single_use = fixed.is_constant_expression(self.scope);
+            if (single_use == "f") {
+                var scope = self.scope;
+                do {
+                    if (scope instanceof AST_Defun || is_func_expr(scope)) {
+                        set_flag(scope, INLINED);
+                    }
+                } while (scope = scope.parent_scope);
+            }
+        }
+    }
+
+    if (single_use && (fixed instanceof AST_Lambda || fixed instanceof AST_Class)) {
+        single_use =
+            def.scope === self.scope
+                && !scope_encloses_variables_in_this_scope(nearest_scope, fixed)
+            || parent instanceof AST_Call
+                && parent.expression === self
+                && !scope_encloses_variables_in_this_scope(nearest_scope, fixed)
+                && !(fixed.name && fixed.name.definition().recursive_refs > 0);
+    }
+
+    if (single_use && fixed) {
+        if (fixed instanceof AST_DefClass) {
+            set_flag(fixed, SQUEEZED);
+            fixed = make_node(AST_ClassExpression, fixed, fixed);
+        }
+        if (fixed instanceof AST_Defun) {
+            set_flag(fixed, SQUEEZED);
+            fixed = make_node(AST_Function, fixed, fixed);
+        }
+        if (def.recursive_refs > 0 && fixed.name instanceof AST_SymbolDefun) {
+            const defun_def = fixed.name.definition();
+            let lambda_def = fixed.variables.get(fixed.name.name);
+            let name = lambda_def && lambda_def.orig[0];
+            if (!(name instanceof AST_SymbolLambda)) {
+                name = make_node(AST_SymbolLambda, fixed.name, fixed.name);
+                name.scope = fixed;
+                fixed.name = name;
+                lambda_def = fixed.def_function(name);
+            }
+            walk(fixed, node => {
+                if (node instanceof AST_SymbolRef && node.definition() === defun_def) {
+                    node.thedef = lambda_def;
+                    lambda_def.references.push(node);
+                }
+            });
+        }
+        if (
+            (fixed instanceof AST_Lambda || fixed instanceof AST_Class)
+            && fixed.parent_scope !== nearest_scope
+        ) {
+            fixed = fixed.clone(true, compressor.get_toplevel());
+
+            nearest_scope.add_child_scope(fixed);
+        }
+        return fixed.optimize(compressor);
+    }
+
+    // multiple uses
+    if (fixed) {
+        let replace;
+
+        if (fixed instanceof AST_This) {
+            if (!(def.orig[0] instanceof AST_SymbolFunarg)
+                && def.references.every((ref) =>
+                    def.scope === ref.scope
+                )) {
+                replace = fixed;
+            }
+        } else {
+            var ev = fixed.evaluate(compressor);
+            if (
+                ev !== fixed
+                && (compressor.option("unsafe_regexp") || !(ev instanceof RegExp))
+            ) {
+                replace = make_node_from_constant(ev, fixed);
+            }
+        }
+
+        if (replace) {
+            const name_length = self.size(compressor);
+            const replace_size = replace.size(compressor);
+
+            let overhead = 0;
+            if (compressor.option("unused") && !compressor.exposed(def)) {
+                overhead =
+                    (name_length + 2 + replace_size) /
+                    (def.references.length - def.assignments);
+            }
+
+            if (replace_size <= name_length + overhead) {
+                return replace;
+            }
+        }
+    }
+
+    return self;
+}
+
+export function inline_into_call(self, compressor) {
+    var exp = self.expression;
+    var fn = exp;
+    var simple_args = self.args.every((arg) => !(arg instanceof AST_Expansion));
+
+    if (compressor.option("reduce_vars")
+        && fn instanceof AST_SymbolRef
+        && !has_annotation(self, _NOINLINE)
+    ) {
+        const fixed = fn.fixed_value();
+
+        if (
+            retain_top_func(fixed, compressor)
+            || !compressor.toplevel.funcs && exp.definition().global
+        ) {
+            return self;
+        }
+
+        fn = fixed;
+    }
+
+    var is_func = fn instanceof AST_Lambda;
+
+    var stat = is_func && fn.body[0];
+    var is_regular_func = is_func && !fn.is_generator && !fn.async;
+    var can_inline = is_regular_func && compressor.option("inline") && !self.is_callee_pure(compressor);
+    if (can_inline && stat instanceof AST_Return) {
+        let returned = stat.value;
+        if (!returned || returned.is_constant_expression()) {
+            if (returned) {
+                returned = returned.clone(true);
+            } else {
+                returned = make_node(AST_Undefined, self);
+            }
+            const args = self.args.concat(returned);
+            return make_sequence(self, args).optimize(compressor);
+        }
+
+        // optimize identity function
+        if (
+            fn.argnames.length === 1
+            && (fn.argnames[0] instanceof AST_SymbolFunarg)
+            && self.args.length < 2
+            && !(self.args[0] instanceof AST_Expansion)
+            && returned instanceof AST_SymbolRef
+            && returned.name === fn.argnames[0].name
+        ) {
+            const replacement =
+                (self.args[0] || make_node(AST_Undefined)).optimize(compressor);
+
+            let parent;
+            if (
+                replacement instanceof AST_PropAccess
+                && (parent = compressor.parent()) instanceof AST_Call
+                && parent.expression === self
+            ) {
+                // identity function was being used to remove `this`, like in
+                //
+                // id(bag.no_this)(...)
+                //
+                // Replace with a larger but more effish (0, bag.no_this) wrapper.
+
+                return make_sequence(self, [
+                    make_node(AST_Number, self, { value: 0 }),
+                    replacement
+                ]);
+            }
+            // replace call with first argument or undefined if none passed
+            return replacement;
+        }
+    }
+
+    if (can_inline) {
+        var scope, in_loop, level = -1;
+        let def;
+        let returned_value;
+        let nearest_scope;
+        if (simple_args
+            && !fn.uses_arguments
+            && !(compressor.parent() instanceof AST_Class)
+            && !(fn.name && fn instanceof AST_Function)
+            && (returned_value = can_flatten_body(stat))
+            && (exp === fn
+                || has_annotation(self, _INLINE)
+                || compressor.option("unused")
+                    && (def = exp.definition()).references.length == 1
+                    && !is_recursive_ref(compressor, def)
+                    && fn.is_constant_expression(exp.scope))
+            && !has_annotation(self, _PURE | _NOINLINE)
+            && !fn.contains_this()
+            && can_inject_symbols()
+            && (nearest_scope = compressor.find_scope())
+            && !scope_encloses_variables_in_this_scope(nearest_scope, fn)
+            && !(function in_default_assign() {
+                    // Due to the fact function parameters have their own scope
+                    // which can't use `var something` in the function body within,
+                    // we simply don't inline into DefaultAssign.
+                    let i = 0;
+                    let p;
+                    while ((p = compressor.parent(i++))) {
+                        if (p instanceof AST_DefaultAssign) return true;
+                        if (p instanceof AST_Block) break;
+                    }
+                    return false;
+                })()
+            && !(scope instanceof AST_Class)
+        ) {
+            set_flag(fn, SQUEEZED);
+            nearest_scope.add_child_scope(fn);
+            return make_sequence(self, flatten_fn(returned_value)).optimize(compressor);
+        }
+    }
+
+    if (can_inline && has_annotation(self, _INLINE)) {
+        set_flag(fn, SQUEEZED);
+        fn = make_node(fn.CTOR === AST_Defun ? AST_Function : fn.CTOR, fn, fn);
+        fn = fn.clone(true);
+        fn.figure_out_scope({}, {
+            parent_scope: compressor.find_scope(),
+            toplevel: compressor.get_toplevel()
+        });
+
+        return make_node(AST_Call, self, {
+            expression: fn,
+            args: self.args,
+        }).optimize(compressor);
+    }
+
+    const can_drop_this_call = is_regular_func && compressor.option("side_effects") && fn.body.every(is_empty);
+    if (can_drop_this_call) {
+        var args = self.args.concat(make_node(AST_Undefined, self));
+        return make_sequence(self, args).optimize(compressor);
+    }
+
+    if (compressor.option("negate_iife")
+        && compressor.parent() instanceof AST_SimpleStatement
+        && is_iife_call(self)) {
+        return self.negate(compressor, true);
+    }
+
+    var ev = self.evaluate(compressor);
+    if (ev !== self) {
+        ev = make_node_from_constant(ev, self).optimize(compressor);
+        return best_of(compressor, ev, self);
+    }
+
+    return self;
+
+    function return_value(stat) {
+        if (!stat) return make_node(AST_Undefined, self);
+        if (stat instanceof AST_Return) {
+            if (!stat.value) return make_node(AST_Undefined, self);
+            return stat.value.clone(true);
+        }
+        if (stat instanceof AST_SimpleStatement) {
+            return make_node(AST_UnaryPrefix, stat, {
+                operator: "void",
+                expression: stat.body.clone(true)
+            });
+        }
+    }
+
+    function can_flatten_body(stat) {
+        var body = fn.body;
+        var len = body.length;
+        if (compressor.option("inline") < 3) {
+            return len == 1 && return_value(stat);
+        }
+        stat = null;
+        for (var i = 0; i < len; i++) {
+            var line = body[i];
+            if (line instanceof AST_Var) {
+                if (stat && !line.definitions.every((var_def) =>
+                    !var_def.value
+                )) {
+                    return false;
+                }
+            } else if (stat) {
+                return false;
+            } else if (!(line instanceof AST_EmptyStatement)) {
+                stat = line;
+            }
+        }
+        return return_value(stat);
+    }
+
+    function can_inject_args(block_scoped, safe_to_inject) {
+        for (var i = 0, len = fn.argnames.length; i < len; i++) {
+            var arg = fn.argnames[i];
+            if (arg instanceof AST_DefaultAssign) {
+                if (has_flag(arg.left, UNUSED)) continue;
+                return false;
+            }
+            if (arg instanceof AST_Destructuring) return false;
+            if (arg instanceof AST_Expansion) {
+                if (has_flag(arg.expression, UNUSED)) continue;
+                return false;
+            }
+            if (has_flag(arg, UNUSED)) continue;
+            if (!safe_to_inject
+                || block_scoped.has(arg.name)
+                || identifier_atom.has(arg.name)
+                || scope.conflicting_def(arg.name)) {
+                return false;
+            }
+            if (in_loop) in_loop.push(arg.definition());
+        }
+        return true;
+    }
+
+    function can_inject_vars(block_scoped, safe_to_inject) {
+        var len = fn.body.length;
+        for (var i = 0; i < len; i++) {
+            var stat = fn.body[i];
+            if (!(stat instanceof AST_Var)) continue;
+            if (!safe_to_inject) return false;
+            for (var j = stat.definitions.length; --j >= 0;) {
+                var name = stat.definitions[j].name;
+                if (name instanceof AST_Destructuring
+                    || block_scoped.has(name.name)
+                    || identifier_atom.has(name.name)
+                    || scope.conflicting_def(name.name)) {
+                    return false;
+                }
+                if (in_loop) in_loop.push(name.definition());
+            }
+        }
+        return true;
+    }
+
+    function can_inject_symbols() {
+        var block_scoped = new Set();
+        do {
+            scope = compressor.parent(++level);
+            if (scope.is_block_scope() && scope.block_scope) {
+                // TODO this is sometimes undefined during compression.
+                // But it should always have a value!
+                scope.block_scope.variables.forEach(function (variable) {
+                    block_scoped.add(variable.name);
+                });
+            }
+            if (scope instanceof AST_Catch) {
+                // TODO can we delete? AST_Catch is a block scope.
+                if (scope.argname) {
+                    block_scoped.add(scope.argname.name);
+                }
+            } else if (scope instanceof AST_IterationStatement) {
+                in_loop = [];
+            } else if (scope instanceof AST_SymbolRef) {
+                if (scope.fixed_value() instanceof AST_Scope) return false;
+            }
+        } while (!(scope instanceof AST_Scope));
+
+        var safe_to_inject = !(scope instanceof AST_Toplevel) || compressor.toplevel.vars;
+        var inline = compressor.option("inline");
+        if (!can_inject_vars(block_scoped, inline >= 3 && safe_to_inject)) return false;
+        if (!can_inject_args(block_scoped, inline >= 2 && safe_to_inject)) return false;
+        return !in_loop || in_loop.length == 0 || !is_reachable(fn, in_loop);
+    }
+
+    function append_var(decls, expressions, name, value) {
+        var def = name.definition();
+
+        // Name already exists, only when a function argument had the same name
+        const already_appended = scope.variables.has(name.name);
+        if (!already_appended) {
+            scope.variables.set(name.name, def);
+            scope.enclosed.push(def);
+            decls.push(make_node(AST_VarDef, name, {
+                name: name,
+                value: null
+            }));
+        }
+
+        var sym = make_node(AST_SymbolRef, name, name);
+        def.references.push(sym);
+        if (value) expressions.push(make_node(AST_Assign, self, {
+            operator: "=",
+            logical: false,
+            left: sym,
+            right: value.clone()
+        }));
+    }
+
+    function flatten_args(decls, expressions) {
+        var len = fn.argnames.length;
+        for (var i = self.args.length; --i >= len;) {
+            expressions.push(self.args[i]);
+        }
+        for (i = len; --i >= 0;) {
+            var name = fn.argnames[i];
+            var value = self.args[i];
+            if (has_flag(name, UNUSED) || !name.name || scope.conflicting_def(name.name)) {
+                if (value) expressions.push(value);
+            } else {
+                var symbol = make_node(AST_SymbolVar, name, name);
+                name.definition().orig.push(symbol);
+                if (!value && in_loop) value = make_node(AST_Undefined, self);
+                append_var(decls, expressions, symbol, value);
+            }
+        }
+        decls.reverse();
+        expressions.reverse();
+    }
+
+    function flatten_vars(decls, expressions) {
+        var pos = expressions.length;
+        for (var i = 0, lines = fn.body.length; i < lines; i++) {
+            var stat = fn.body[i];
+            if (!(stat instanceof AST_Var)) continue;
+            for (var j = 0, defs = stat.definitions.length; j < defs; j++) {
+                var var_def = stat.definitions[j];
+                var name = var_def.name;
+                append_var(decls, expressions, name, var_def.value);
+                if (in_loop && fn.argnames.every((argname) =>
+                    argname.name != name.name
+                )) {
+                    var def = fn.variables.get(name.name);
+                    var sym = make_node(AST_SymbolRef, name, name);
+                    def.references.push(sym);
+                    expressions.splice(pos++, 0, make_node(AST_Assign, var_def, {
+                        operator: "=",
+                        logical: false,
+                        left: sym,
+                        right: make_node(AST_Undefined, name)
+                    }));
+                }
+            }
+        }
+    }
+
+    function flatten_fn(returned_value) {
+        var decls = [];
+        var expressions = [];
+        flatten_args(decls, expressions);
+        flatten_vars(decls, expressions);
+        expressions.push(returned_value);
+
+        if (decls.length) {
+            const i = scope.body.indexOf(compressor.parent(level - 1)) + 1;
+            scope.body.splice(i, 0, make_node(AST_Var, fn, {
+                definitions: decls
+            }));
+        }
+
+        return expressions.map(exp => exp.clone(true));
+    }
+}