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3.2 kBJavaScriptView Raw
1/*
2 MIT License http://www.opensource.org/licenses/mit-license.php
3 Author Tobias Koppers @sokra
4*/
5
6"use strict";
7
8const UnsupportedFeatureWarning = require("../UnsupportedFeatureWarning");
9const ConstDependency = require("../dependencies/ConstDependency");
10const BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
11
12/** @typedef {import("estree").Expression} ExpressionNode */
13/** @typedef {import("estree").Node} Node */
14/** @typedef {import("./JavascriptParser")} JavascriptParser */
15
16/**
17 * @param {JavascriptParser} parser the parser
18 * @param {string} value the const value
19 * @param {string[]=} runtimeRequirements runtime requirements
20 * @returns {function(ExpressionNode): true} plugin function
21 */
22exports.toConstantDependency = (parser, value, runtimeRequirements) => {
23 return function constDependency(expr) {
24 const dep = new ConstDependency(value, expr.range, runtimeRequirements);
25 dep.loc = expr.loc;
26 parser.state.module.addPresentationalDependency(dep);
27 return true;
28 };
29};
30
31/**
32 * @param {string} value the string value
33 * @returns {function(ExpressionNode): BasicEvaluatedExpression} plugin function
34 */
35exports.evaluateToString = value => {
36 return function stringExpression(expr) {
37 return new BasicEvaluatedExpression().setString(value).setRange(expr.range);
38 };
39};
40
41/**
42 * @param {number} value the number value
43 * @returns {function(ExpressionNode): BasicEvaluatedExpression} plugin function
44 */
45exports.evaluateToNumber = value => {
46 return function stringExpression(expr) {
47 return new BasicEvaluatedExpression().setNumber(value).setRange(expr.range);
48 };
49};
50
51/**
52 * @param {boolean} value the boolean value
53 * @returns {function(ExpressionNode): BasicEvaluatedExpression} plugin function
54 */
55exports.evaluateToBoolean = value => {
56 return function booleanExpression(expr) {
57 return new BasicEvaluatedExpression()
58 .setBoolean(value)
59 .setRange(expr.range);
60 };
61};
62
63/**
64 * @param {string} identifier identifier
65 * @param {string} rootInfo rootInfo
66 * @param {function(): string[]} getMembers getMembers
67 * @param {boolean|null=} truthy is truthy, null if nullish
68 * @returns {function(ExpressionNode): BasicEvaluatedExpression} callback
69 */
70exports.evaluateToIdentifier = (identifier, rootInfo, getMembers, truthy) => {
71 return function identifierExpression(expr) {
72 let evaluatedExpression = new BasicEvaluatedExpression()
73 .setIdentifier(identifier, rootInfo, getMembers)
74 .setSideEffects(false)
75 .setRange(expr.range);
76 switch (truthy) {
77 case true:
78 evaluatedExpression.setTruthy();
79 break;
80 case null:
81 evaluatedExpression.setNullish(true);
82 break;
83 case false:
84 evaluatedExpression.setFalsy();
85 break;
86 }
87
88 return evaluatedExpression;
89 };
90};
91
92exports.expressionIsUnsupported = (parser, message) => {
93 return function unsupportedExpression(expr) {
94 const dep = new ConstDependency("(void 0)", expr.range, null);
95 dep.loc = expr.loc;
96 parser.state.module.addPresentationalDependency(dep);
97 if (!parser.state.module) return;
98 parser.state.module.addWarning(
99 new UnsupportedFeatureWarning(message, expr.loc)
100 );
101 return true;
102 };
103};
104
105exports.skipTraversal = () => true;
106
107exports.approve = () => true;