diff options
Diffstat (limited to 'node_modules/babel-plugin-minify-constant-folding/lib/index.js')
| -rw-r--r-- | node_modules/babel-plugin-minify-constant-folding/lib/index.js | 230 |
1 files changed, 0 insertions, 230 deletions
diff --git a/node_modules/babel-plugin-minify-constant-folding/lib/index.js b/node_modules/babel-plugin-minify-constant-folding/lib/index.js deleted file mode 100644 index 6d50411b..00000000 --- a/node_modules/babel-plugin-minify-constant-folding/lib/index.js +++ /dev/null @@ -1,230 +0,0 @@ -"use strict"; - -const evaluate = require("babel-helper-evaluate-path"); - -const _require = require("./replacements"), - FALLBACK_HANDLER = _require.FALLBACK_HANDLER; - -function getName(member) { - if (member.computed) { - switch (member.property.type) { - case "StringLiteral": - case "NumericLiteral": - return member.property.value; - - case "TemplateLiteral": - return; - } - } else { - return member.property.name; - } -} - -function swap(path, member, handlers, ...args) { - const key = getName(member.node); - if (key === void 0) return false; - let handler; - - if (hop(handlers, key) && typeof handlers[key] === "function") { - handler = handlers[key]; - } else if (typeof handlers[FALLBACK_HANDLER] === "function") { - handler = handlers[FALLBACK_HANDLER].bind(member.get("object"), key); - } else { - return false; - } - - const replacement = handler.apply(member.get("object"), args); - - if (replacement) { - path.replaceWith(replacement); - return true; - } - - return false; -} - -module.exports = babel => { - const replacements = require("./replacements.js")(babel); - - const seen = Symbol("seen"); - const t = babel.types; - return { - name: "minify-constant-folding", - visitor: { - // Evaluate string expressions that are next to each other - // but are not actually a binary expression. - // "a" + b + "c" + "d" -> "a" + b + "cd" - BinaryExpression(path) { - if (!path.isBinaryExpression({ - operator: "+" - })) { - return; - } - - let literal, bin; - const left = path.get("left"); - const right = path.get("right"); - - if (right.isStringLiteral()) { - literal = right; - - if (left.isBinaryExpression({ - operator: "+" - })) { - bin = left; - } else { - return; - } - } else if (left.isStringLiteral()) { - literal = left; - - if (right.isBinaryExpression({ - operator: "+" - })) { - bin = right; - } else { - return; - } - } else { - return; - } - - const relevant = getLeaf(bin, literal.key); - - if (!relevant) { - return; - } - - const value = literal.key === "right" ? relevant.node.value + literal.node.value : literal.node.value + relevant.node.value; - relevant.replaceWith(t.stringLiteral(value)); - path.replaceWith(bin.node); - - function getLeaf(path, direction) { - if (path.isStringLiteral()) { - return path; - } else if (path.isBinaryExpression({ - operator: "+" - })) { - return getLeaf(path.get(direction), direction); - } - } - }, - - // TODO: look into evaluating binding too (could result in more code, but gzip?) - Expression(path, { - opts: { - tdz = false - } = {} - }) { - const node = path.node, - parent = path.parent; - - if (node[seen]) { - return; - } - - if (path.isLiteral()) { - return; - } - - if (!path.isPure()) { - return; - } // Avoid replacing the values for identifiers in exports - - - if (t.isExportSpecifier(parent)) { - return; - } // -0 maybe compared via dividing and then checking against -Infinity - // Also -X will always be -X. - - - if (t.isUnaryExpression(node, { - operator: "-" - }) && t.isNumericLiteral(node.argument)) { - return; - } // We have a transform that converts true/false to !0/!1 - - - if (t.isUnaryExpression(node, { - operator: "!" - }) && t.isNumericLiteral(node.argument)) { - if (node.argument.value === 0 || node.argument.value === 1) { - return; - } - } // void 0 is used for undefined. - - - if (t.isUnaryExpression(node, { - operator: "void" - }) && t.isNumericLiteral(node.argument, { - value: 0 - })) { - return; - } - - const res = evaluate(path, { - tdz - }); - - if (res.confident) { - // Avoid fractions because they can be longer than the original expression. - // There is also issues with number precision? - if (typeof res.value === "number" && !Number.isInteger(res.value)) { - return; - } // Preserve -0 - - - if (typeof res.value === "number" && res.value === 0) { - if (1 / res.value === -Infinity) { - const node = t.unaryExpression("-", t.numericLiteral(0), true); - node[seen] = true; - path.replaceWith(node); - return; - } - } // this will convert object to object but - // t.valueToNode has other effects where property name - // is not treated for the respective environment. - // So we bail here for objects and let other plugins - // take care of converting String literal to Identifier - - - if (typeof res.value === "object") { - return; - } - - const node = t.valueToNode(res.value); - node[seen] = true; - path.replaceWith(node); - } - }, - - CallExpression(path) { - const node = path.node; - const member = path.get("callee"); - - if (t.isMemberExpression(member)) { - const helpers = replacements[member.node.object.type]; - if (!helpers || !helpers.calls) return; // find if the input can be constant folded - - if (typeof helpers.canReplace === "function" && !helpers.canReplace.call(member.get("object"))) { - return; - } - - swap(path, member, helpers.calls, ...node.arguments); - } - }, - - MemberExpression(path) { - const node = path.node; - const helpers = replacements[node.object.type]; - if (!helpers || !helpers.members) return; - swap(path, path, helpers.members); - } - - } - }; -}; - -function hop(o, key) { - return Object.prototype.hasOwnProperty.call(o, key); -}
\ No newline at end of file |