65 lines
1.9 KiB
JavaScript
65 lines
1.9 KiB
JavaScript
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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/** @typedef {import("estree").ArrowFunctionExpression} ArrowFunctionExpression */
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/** @typedef {import("estree").Expression} Expression */
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/** @typedef {import("estree").FunctionExpression} FunctionExpression */
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/** @typedef {import("estree").SpreadElement} SpreadElement */
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/**
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* @param {Expression | SpreadElement} expr expressions
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* @returns {{fn: FunctionExpression | ArrowFunctionExpression, expressions: (Expression | SpreadElement)[], needThis: boolean | undefined } | undefined} function expression with additional information
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*/
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module.exports = (expr) => {
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// <FunctionExpression>
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if (
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expr.type === "FunctionExpression" ||
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expr.type === "ArrowFunctionExpression"
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) {
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return {
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fn: expr,
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expressions: [],
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needThis: false
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};
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}
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// <FunctionExpression>.bind(<Expression>)
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if (
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expr.type === "CallExpression" &&
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expr.callee.type === "MemberExpression" &&
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expr.callee.object.type === "FunctionExpression" &&
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expr.callee.property.type === "Identifier" &&
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expr.callee.property.name === "bind" &&
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expr.arguments.length === 1
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) {
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return {
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fn: expr.callee.object,
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expressions: [expr.arguments[0]],
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needThis: undefined
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};
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}
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// (function(_this) {return <FunctionExpression>})(this) (Coffeescript)
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if (
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expr.type === "CallExpression" &&
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expr.callee.type === "FunctionExpression" &&
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expr.callee.body.type === "BlockStatement" &&
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expr.arguments.length === 1 &&
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expr.arguments[0].type === "ThisExpression" &&
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expr.callee.body.body &&
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expr.callee.body.body.length === 1 &&
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expr.callee.body.body[0].type === "ReturnStatement" &&
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expr.callee.body.body[0].argument &&
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expr.callee.body.body[0].argument.type === "FunctionExpression"
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) {
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return {
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fn: expr.callee.body.body[0].argument,
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expressions: [],
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needThis: true
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};
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}
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};
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