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JavascriptParser.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const { Parser: AcornParser } = require("acorn");
const { SyncBailHook, HookMap } = require("tapable");
const vm = require("vm");
const Parser = require("../Parser");
const StackedMap = require("../util/StackedMap");
const binarySearchBounds = require("../util/binarySearchBounds");
const memoize = require("../util/memoize");
const BasicEvaluatedExpression = require("./BasicEvaluatedExpression");
/** @typedef {import("acorn").Options} AcornOptions */
/** @typedef {import("estree").ArrayExpression} ArrayExpressionNode */
/** @typedef {import("estree").BinaryExpression} BinaryExpressionNode */
/** @typedef {import("estree").BlockStatement} BlockStatementNode */
/** @typedef {import("estree").SequenceExpression} SequenceExpressionNode */
/** @typedef {import("estree").CallExpression} CallExpressionNode */
/** @typedef {import("estree").ClassDeclaration} ClassDeclarationNode */
/** @typedef {import("estree").ClassExpression} ClassExpressionNode */
/** @typedef {import("estree").Comment} CommentNode */
/** @typedef {import("estree").ConditionalExpression} ConditionalExpressionNode */
/** @typedef {import("estree").Declaration} DeclarationNode */
/** @typedef {import("estree").PrivateIdentifier} PrivateIdentifierNode */
/** @typedef {import("estree").PropertyDefinition} PropertyDefinitionNode */
/** @typedef {import("estree").Expression} ExpressionNode */
/** @typedef {import("estree").Identifier} IdentifierNode */
/** @typedef {import("estree").IfStatement} IfStatementNode */
/** @typedef {import("estree").LabeledStatement} LabeledStatementNode */
/** @typedef {import("estree").Literal} LiteralNode */
/** @typedef {import("estree").LogicalExpression} LogicalExpressionNode */
/** @typedef {import("estree").ChainExpression} ChainExpressionNode */
/** @typedef {import("estree").MemberExpression} MemberExpressionNode */
/** @typedef {import("estree").MetaProperty} MetaPropertyNode */
/** @typedef {import("estree").MethodDefinition} MethodDefinitionNode */
/** @typedef {import("estree").ModuleDeclaration} ModuleDeclarationNode */
/** @typedef {import("estree").NewExpression} NewExpressionNode */
/** @typedef {import("estree").Node} AnyNode */
/** @typedef {import("estree").Program} ProgramNode */
/** @typedef {import("estree").Statement} StatementNode */
/** @typedef {import("estree").Super} SuperNode */
/** @typedef {import("estree").TaggedTemplateExpression} TaggedTemplateExpressionNode */
/** @typedef {import("estree").TemplateLiteral} TemplateLiteralNode */
/** @typedef {import("estree").ThisExpression} ThisExpressionNode */
/** @typedef {import("estree").UnaryExpression} UnaryExpressionNode */
/** @typedef {import("estree").VariableDeclarator} VariableDeclaratorNode */
/** @template T @typedef {import("tapable").AsArray<T>} AsArray<T> */
/** @typedef {import("../Parser").ParserState} ParserState */
/** @typedef {import("../Parser").PreparsedAst} PreparsedAst */
/** @typedef {{declaredScope: ScopeInfo, freeName: string | true, tagInfo: TagInfo | undefined}} VariableInfoInterface */
/** @typedef {{ name: string | VariableInfo, rootInfo: string | VariableInfo, getMembers: () => string[] }} GetInfoResult */
const EMPTY_ARRAY = [];
const ALLOWED_MEMBER_TYPES_CALL_EXPRESSION = 0b01;
const ALLOWED_MEMBER_TYPES_EXPRESSION = 0b10;
const ALLOWED_MEMBER_TYPES_ALL = 0b11;
// Syntax: https://developer.mozilla.org/en/SpiderMonkey/Parser_API
const parser = AcornParser;
class VariableInfo {
/**
* @param {ScopeInfo} declaredScope scope in which the variable is declared
* @param {string | true} freeName which free name the variable aliases, or true when none
* @param {TagInfo | undefined} tagInfo info about tags
*/
constructor(declaredScope, freeName, tagInfo) {
this.declaredScope = declaredScope;
this.freeName = freeName;
this.tagInfo = tagInfo;
}
}
/** @typedef {string | ScopeInfo | VariableInfo} ExportedVariableInfo */
/** @typedef {LiteralNode | string | null | undefined} ImportSource */
/** @typedef {Omit<AcornOptions, "sourceType" | "ecmaVersion"> & { sourceType: "module" | "script" | "auto", ecmaVersion?: AcornOptions["ecmaVersion"] }} ParseOptions */
/**
* @typedef {Object} TagInfo
* @property {any} tag
* @property {any} data
* @property {TagInfo | undefined} next
*/
/**
* @typedef {Object} ScopeInfo
* @property {StackedMap<string, VariableInfo | ScopeInfo>} definitions
* @property {boolean | "arrow"} topLevelScope
* @property {boolean} inShorthand
* @property {boolean} isStrict
* @property {boolean} isAsmJs
* @property {boolean} inTry
*/
const joinRanges = (startRange, endRange) => {
if (!endRange) return startRange;
if (!startRange) return endRange;
return [startRange[0], endRange[1]];
};
const objectAndMembersToName = (object, membersReversed) => {
let name = object;
for (let i = membersReversed.length - 1; i >= 0; i--) {
name = name + "." + membersReversed[i];
}
return name;
};
const getRootName = expression => {
switch (expression.type) {
case "Identifier":
return expression.name;
case "ThisExpression":
return "this";
case "MetaProperty":
return `${expression.meta.name}.${expression.property.name}`;
default:
return undefined;
}
};
/** @type {AcornOptions} */
const defaultParserOptions = {
ranges: true,
locations: true,
ecmaVersion: "latest",
sourceType: "module",
onComment: null
};
// regexp to match at least one "magic comment"
const webpackCommentRegExp = new RegExp(/(^|\W)webpack[A-Z]{1,}[A-Za-z]{1,}:/);
const EMPTY_COMMENT_OPTIONS = {
options: null,
errors: null
};
class JavascriptParser extends Parser {
/**
* @param {"module" | "script" | "auto"} sourceType default source type
*/
constructor(sourceType = "auto") {
super();
this.hooks = Object.freeze({
/** @type {HookMap<SyncBailHook<[UnaryExpressionNode], BasicEvaluatedExpression | undefined | null>>} */
evaluateTypeof: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {HookMap<SyncBailHook<[ExpressionNode], BasicEvaluatedExpression | undefined | null>>} */
evaluate: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {HookMap<SyncBailHook<[IdentifierNode | ThisExpressionNode | MemberExpressionNode | MetaPropertyNode], BasicEvaluatedExpression | undefined | null>>} */
evaluateIdentifier: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {HookMap<SyncBailHook<[IdentifierNode | ThisExpressionNode | MemberExpressionNode], BasicEvaluatedExpression | undefined | null>>} */
evaluateDefinedIdentifier: new HookMap(
() => new SyncBailHook(["expression"])
),
/** @type {HookMap<SyncBailHook<[CallExpressionNode, BasicEvaluatedExpression | undefined], BasicEvaluatedExpression | undefined | null>>} */
evaluateCallExpressionMember: new HookMap(
() => new SyncBailHook(["expression", "param"])
),
/** @type {HookMap<SyncBailHook<[ExpressionNode | DeclarationNode | PrivateIdentifierNode, number], boolean | void>>} */
isPure: new HookMap(
() => new SyncBailHook(["expression", "commentsStartPosition"])
),
/** @type {SyncBailHook<[StatementNode | ModuleDeclarationNode], boolean | void>} */
preStatement: new SyncBailHook(["statement"]),
/** @type {SyncBailHook<[StatementNode | ModuleDeclarationNode], boolean | void>} */
blockPreStatement: new SyncBailHook(["declaration"]),
/** @type {SyncBailHook<[StatementNode | ModuleDeclarationNode], boolean | void>} */
statement: new SyncBailHook(["statement"]),
/** @type {SyncBailHook<[IfStatementNode], boolean | void>} */
statementIf: new SyncBailHook(["statement"]),
/** @type {SyncBailHook<[ExpressionNode, ClassExpressionNode | ClassDeclarationNode], boolean | void>} */
classExtendsExpression: new SyncBailHook([
"expression",
"classDefinition"
]),
/** @type {SyncBailHook<[MethodDefinitionNode | PropertyDefinitionNode, ClassExpressionNode | ClassDeclarationNode], boolean | void>} */
classBodyElement: new SyncBailHook(["element", "classDefinition"]),
/** @type {SyncBailHook<[ExpressionNode, MethodDefinitionNode | PropertyDefinitionNode, ClassExpressionNode | ClassDeclarationNode], boolean | void>} */
classBodyValue: new SyncBailHook([
"expression",
"element",
"classDefinition"
]),
/** @type {HookMap<SyncBailHook<[LabeledStatementNode], boolean | void>>} */
label: new HookMap(() => new SyncBailHook(["statement"])),
/** @type {SyncBailHook<[StatementNode, ImportSource], boolean | void>} */
import: new SyncBailHook(["statement", "source"]),
/** @type {SyncBailHook<[StatementNode, ImportSource, string, string], boolean | void>} */
importSpecifier: new SyncBailHook([
"statement",
"source",
"exportName",
"identifierName"
]),
/** @type {SyncBailHook<[StatementNode], boolean | void>} */
export: new SyncBailHook(["statement"]),
/** @type {SyncBailHook<[StatementNode, ImportSource], boolean | void>} */
exportImport: new SyncBailHook(["statement", "source"]),
/** @type {SyncBailHook<[StatementNode, DeclarationNode], boolean | void>} */
exportDeclaration: new SyncBailHook(["statement", "declaration"]),
/** @type {SyncBailHook<[StatementNode, DeclarationNode], boolean | void>} */
exportExpression: new SyncBailHook(["statement", "declaration"]),
/** @type {SyncBailHook<[StatementNode, string, string, number | undefined], boolean | void>} */
exportSpecifier: new SyncBailHook([
"statement",
"identifierName",
"exportName",
"index"
]),
/** @type {SyncBailHook<[StatementNode, ImportSource, string, string, number | undefined], boolean | void>} */
exportImportSpecifier: new SyncBailHook([
"statement",
"source",
"identifierName",
"exportName",
"index"
]),
/** @type {SyncBailHook<[VariableDeclaratorNode, StatementNode], boolean | void>} */
preDeclarator: new SyncBailHook(["declarator", "statement"]),
/** @type {SyncBailHook<[VariableDeclaratorNode, StatementNode], boolean | void>} */
declarator: new SyncBailHook(["declarator", "statement"]),
/** @type {HookMap<SyncBailHook<[DeclarationNode], boolean | void>>} */
varDeclaration: new HookMap(() => new SyncBailHook(["declaration"])),
/** @type {HookMap<SyncBailHook<[DeclarationNode], boolean | void>>} */
varDeclarationLet: new HookMap(() => new SyncBailHook(["declaration"])),
/** @type {HookMap<SyncBailHook<[DeclarationNode], boolean | void>>} */
varDeclarationConst: new HookMap(() => new SyncBailHook(["declaration"])),
/** @type {HookMap<SyncBailHook<[DeclarationNode], boolean | void>>} */
varDeclarationVar: new HookMap(() => new SyncBailHook(["declaration"])),
/** @type {HookMap<SyncBailHook<[IdentifierNode], boolean | void>>} */
pattern: new HookMap(() => new SyncBailHook(["pattern"])),
/** @type {HookMap<SyncBailHook<[ExpressionNode], boolean | void>>} */
canRename: new HookMap(() => new SyncBailHook(["initExpression"])),
/** @type {HookMap<SyncBailHook<[ExpressionNode], boolean | void>>} */
rename: new HookMap(() => new SyncBailHook(["initExpression"])),
/** @type {HookMap<SyncBailHook<[import("estree").AssignmentExpression], boolean | void>>} */
assign: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {HookMap<SyncBailHook<[import("estree").AssignmentExpression, string[]], boolean | void>>} */
assignMemberChain: new HookMap(
() => new SyncBailHook(["expression", "members"])
),
/** @type {HookMap<SyncBailHook<[ExpressionNode], boolean | void>>} */
typeof: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {SyncBailHook<[ExpressionNode], boolean | void>} */
importCall: new SyncBailHook(["expression"]),
/** @type {SyncBailHook<[ExpressionNode], boolean | void>} */
topLevelAwait: new SyncBailHook(["expression"]),
/** @type {HookMap<SyncBailHook<[ExpressionNode], boolean | void>>} */
call: new HookMap(() => new SyncBailHook(["expression"])),
/** Something like "a.b()" */
/** @type {HookMap<SyncBailHook<[CallExpressionNode, string[]], boolean | void>>} */
callMemberChain: new HookMap(
() => new SyncBailHook(["expression", "members"])
),
/** Something like "a.b().c.d" */
/** @type {HookMap<SyncBailHook<[ExpressionNode, string[], CallExpressionNode, string[]], boolean | void>>} */
memberChainOfCallMemberChain: new HookMap(
() =>
new SyncBailHook([
"expression",
"calleeMembers",
"callExpression",
"members"
])
),
/** Something like "a.b().c.d()"" */
/** @type {HookMap<SyncBailHook<[ExpressionNode, string[], CallExpressionNode, string[]], boolean | void>>} */
callMemberChainOfCallMemberChain: new HookMap(
() =>
new SyncBailHook([
"expression",
"calleeMembers",
"innerCallExpression",
"members"
])
),
/** @type {SyncBailHook<[ChainExpressionNode], boolean | void>} */
optionalChaining: new SyncBailHook(["optionalChaining"]),
/** @type {HookMap<SyncBailHook<[NewExpressionNode], boolean | void>>} */
new: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {HookMap<SyncBailHook<[ExpressionNode], boolean | void>>} */
expression: new HookMap(() => new SyncBailHook(["expression"])),
/** @type {HookMap<SyncBailHook<[ExpressionNode, string[]], boolean | void>>} */
expressionMemberChain: new HookMap(
() => new SyncBailHook(["expression", "members"])
),
/** @type {HookMap<SyncBailHook<[ExpressionNode, string[]], boolean | void>>} */
unhandledExpressionMemberChain: new HookMap(
() => new SyncBailHook(["expression", "members"])
),
/** @type {SyncBailHook<[ExpressionNode], boolean | void>} */
expressionConditionalOperator: new SyncBailHook(["expression"]),
/** @type {SyncBailHook<[ExpressionNode], boolean | void>} */
expressionLogicalOperator: new SyncBailHook(["expression"]),
/** @type {SyncBailHook<[ProgramNode, CommentNode[]], boolean | void>} */
program: new SyncBailHook(["ast", "comments"]),
/** @type {SyncBailHook<[ProgramNode, CommentNode[]], boolean | void>} */
finish: new SyncBailHook(["ast", "comments"])
});
this.sourceType = sourceType;
/** @type {ScopeInfo} */
this.scope = undefined;
/** @type {ParserState} */
this.state = undefined;
this.comments = undefined;
this.semicolons = undefined;
/** @type {(StatementNode|ExpressionNode)[]} */
this.statementPath = undefined;
this.prevStatement = undefined;
this.currentTagData = undefined;
this._initializeEvaluating();
}
_initializeEvaluating() {
this.hooks.evaluate.for("Literal").tap("JavascriptParser", _expr => {
const expr = /** @type {LiteralNode} */ (_expr);
switch (typeof expr.value) {
case "number":
return new BasicEvaluatedExpression()
.setNumber(expr.value)
.setRange(expr.range);
case "bigint":
return new BasicEvaluatedExpression()
.setBigInt(expr.value)
.setRange(expr.range);
case "string":
return new BasicEvaluatedExpression()
.setString(expr.value)
.setRange(expr.range);
case "boolean":
return new BasicEvaluatedExpression()
.setBoolean(expr.value)
.setRange(expr.range);
}
if (expr.value === null) {
return new BasicEvaluatedExpression().setNull().setRange(expr.range);
}
if (expr.value instanceof RegExp) {
return new BasicEvaluatedExpression()
.setRegExp(expr.value)
.setRange(expr.range);
}
});
this.hooks.evaluate.for("NewExpression").tap("JavascriptParser", _expr => {
const expr = /** @type {NewExpressionNode} */ (_expr);
const callee = expr.callee;
if (
callee.type !== "Identifier" ||
callee.name !== "RegExp" ||
expr.arguments.length > 2 ||
this.getVariableInfo("RegExp") !== "RegExp"
)
return;
let regExp, flags;
const arg1 = expr.arguments[0];
if (arg1) {
if (arg1.type === "SpreadElement") return;
const evaluatedRegExp = this.evaluateExpression(arg1);
if (!evaluatedRegExp) return;
regExp = evaluatedRegExp.asString();
if (!regExp) return;
} else {
return new BasicEvaluatedExpression()
.setRegExp(new RegExp(""))
.setRange(expr.range);
}
const arg2 = expr.arguments[1];
if (arg2) {
if (arg2.type === "SpreadElement") return;
const evaluatedFlags = this.evaluateExpression(arg2);
if (!evaluatedFlags) return;
if (!evaluatedFlags.isUndefined()) {
flags = evaluatedFlags.asString();
if (
flags === undefined ||
!BasicEvaluatedExpression.isValidRegExpFlags(flags)
)
return;
}
}
return new BasicEvaluatedExpression()
.setRegExp(flags ? new RegExp(regExp, flags) : new RegExp(regExp))
.setRange(expr.range);
});
this.hooks.evaluate
.for("LogicalExpression")
.tap("JavascriptParser", _expr => {
const expr = /** @type {LogicalExpressionNode} */ (_expr);
const left = this.evaluateExpression(expr.left);
if (!left) return;
if (expr.operator === "&&") {
const leftAsBool = left.asBool();
if (leftAsBool === false) return left.setRange(expr.range);
if (leftAsBool !== true) return;
} else if (expr.operator === "||") {
const leftAsBool = left.asBool();
if (leftAsBool === true) return left.setRange(expr.range);
if (leftAsBool !== false) return;
} else if (expr.operator === "??") {
const leftAsNullish = left.asNullish();
if (leftAsNullish === false) return left.setRange(expr.range);
if (leftAsNullish !== true) return;
} else return;
const right = this.evaluateExpression(expr.right);
if (!right) return;
if (left.couldHaveSideEffects()) right.setSideEffects();
return right.setRange(expr.range);
});
const valueAsExpression = (value, expr, sideEffects) => {
switch (typeof value) {
case "boolean":
return new BasicEvaluatedExpression()
.setBoolean(value)
.setSideEffects(sideEffects)
.setRange(expr.range);
case "number":
return new BasicEvaluatedExpression()
.setNumber(value)
.setSideEffects(sideEffects)
.setRange(expr.range);
case "bigint":
return new BasicEvaluatedExpression()
.setBigInt(value)
.setSideEffects(sideEffects)
.setRange(expr.range);
case "string":
return new BasicEvaluatedExpression()
.setString(value)
.setSideEffects(sideEffects)
.setRange(expr.range);
}
};
this.hooks.evaluate
.for("BinaryExpression")
.tap("JavascriptParser", _expr => {
const expr = /** @type {BinaryExpressionNode} */ (_expr);
const handleConstOperation = fn => {
const left = this.evaluateExpression(expr.left);
if (!left || !left.isCompileTimeValue()) return;
const right = this.evaluateExpression(expr.right);
if (!right || !right.isCompileTimeValue()) return;
const result = fn(
left.asCompileTimeValue(),
right.asCompileTimeValue()
);
return valueAsExpression(
result,
expr,
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
};
const isAlwaysDifferent = (a, b) =>
(a === true && b === false) || (a === false && b === true);
const handleTemplateStringCompare = (left, right, res, eql) => {
const getPrefix = parts => {
let value = "";
for (const p of parts) {
const v = p.asString();
if (v !== undefined) value += v;
else break;
}
return value;
};
const getSuffix = parts => {
let value = "";
for (let i = parts.length - 1; i >= 0; i--) {
const v = parts[i].asString();
if (v !== undefined) value = v + value;
else break;
}
return value;
};
const leftPrefix = getPrefix(left.parts);
const rightPrefix = getPrefix(right.parts);
const leftSuffix = getSuffix(left.parts);
const rightSuffix = getSuffix(right.parts);
const lenPrefix = Math.min(leftPrefix.length, rightPrefix.length);
const lenSuffix = Math.min(leftSuffix.length, rightSuffix.length);
if (
leftPrefix.slice(0, lenPrefix) !==
rightPrefix.slice(0, lenPrefix) ||
leftSuffix.slice(-lenSuffix) !== rightSuffix.slice(-lenSuffix)
) {
return res
.setBoolean(!eql)
.setSideEffects(
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
}
};
const handleStrictEqualityComparison = eql => {
const left = this.evaluateExpression(expr.left);
if (!left) return;
const right = this.evaluateExpression(expr.right);
if (!right) return;
const res = new BasicEvaluatedExpression();
res.setRange(expr.range);
const leftConst = left.isCompileTimeValue();
const rightConst = right.isCompileTimeValue();
if (leftConst && rightConst) {
return res
.setBoolean(
eql ===
(left.asCompileTimeValue() === right.asCompileTimeValue())
)
.setSideEffects(
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
}
if (left.isArray() && right.isArray()) {
return res
.setBoolean(!eql)
.setSideEffects(
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
}
if (left.isTemplateString() && right.isTemplateString()) {
return handleTemplateStringCompare(left, right, res, eql);
}
const leftPrimitive = left.isPrimitiveType();
const rightPrimitive = right.isPrimitiveType();
if (
// Primitive !== Object or
// compile-time object types are never equal to something at runtime
(leftPrimitive === false &&
(leftConst || rightPrimitive === true)) ||
(rightPrimitive === false &&
(rightConst || leftPrimitive === true)) ||
// Different nullish or boolish status also means not equal
isAlwaysDifferent(left.asBool(), right.asBool()) ||
isAlwaysDifferent(left.asNullish(), right.asNullish())
) {
return res
.setBoolean(!eql)
.setSideEffects(
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
}
};
const handleAbstractEqualityComparison = eql => {
const left = this.evaluateExpression(expr.left);
if (!left) return;
const right = this.evaluateExpression(expr.right);
if (!right) return;
const res = new BasicEvaluatedExpression();
res.setRange(expr.range);
const leftConst = left.isCompileTimeValue();
const rightConst = right.isCompileTimeValue();
if (leftConst && rightConst) {
return res
.setBoolean(
eql ===
// eslint-disable-next-line eqeqeq
(left.asCompileTimeValue() == right.asCompileTimeValue())
)
.setSideEffects(
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
}
if (left.isArray() && right.isArray()) {
return res
.setBoolean(!eql)
.setSideEffects(
left.couldHaveSideEffects() || right.couldHaveSideEffects()
);
}
if (left.isTemplateString() && right.isTemplateString()) {
return handleTemplateStringCompare(left, right, res, eql);
}
};
if (expr.operator === "+") {
const left = this.evaluateExpression(expr.left);
if (!left) return;
const right = this.evaluateExpression(expr.right);
if (!right) return;
const res = new BasicEvaluatedExpression();
if (left.isString()) {
if (right.isString()) {
res.setString(left.string + right.string);
} else if (right.isNumber()) {
res.setString(left.string + right.number);
} else if (
right.isWrapped() &&
right.prefix &&
right.prefix.isString()
) {
// "left" + ("prefix" + inner + "postfix")
// => ("leftPrefix" + inner + "postfix")
res.setWrapped(
new BasicEvaluatedExpression()
.setString(left.string + right.prefix.string)
.setRange(joinRanges(left.range, right.prefix.range)),
right.postfix,
right.wrappedInnerExpressions
);
} else if (right.isWrapped()) {
// "left" + ([null] + inner + "postfix")
// => ("left" + inner + "postfix")
res.setWrapped(
left,
right.postfix,
right.wrappedInnerExpressions
);
} else {
// "left" + expr
// => ("left" + expr + "")
res.setWrapped(left, null, [right]);
}
} else if (left.isNumber()) {
if (right.isString()) {
res.setString(left.number + right.string);
} else if (right.isNumber()) {
res.setNumber(left.number + right.number);
} else {
return;
}
} else if (left.isBigInt()) {
if (right.isBigInt()) {
res.setBigInt(left.bigint + right.bigint);
}
} else if (left.isWrapped()) {
if (left.postfix && left.postfix.isString() && right.isString()) {
// ("prefix" + inner + "postfix") + "right"
// => ("prefix" + inner + "postfixRight")
res.setWrapped(
left.prefix,
new BasicEvaluatedExpression()
.setString(left.postfix.string + right.string)
.setRange(joinRanges(left.postfix.range, right.range)),
left.wrappedInnerExpressions
);
} else if (
left.postfix &&
left.postfix.isString() &&
right.isNumber()
) {
// ("prefix" + inner + "postfix") + 123
// => ("prefix" + inner + "postfix123")
res.setWrapped(
left.prefix,
new BasicEvaluatedExpression()
.setString(left.postfix.string + right.number)
.setRange(joinRanges(left.postfix.range, right.range)),
left.wrappedInnerExpressions
);
} else if (right.isString()) {
// ("prefix" + inner + [null]) + "right"
// => ("prefix" + inner + "right")
res.setWrapped(left.prefix, right, left.wrappedInnerExpressions);
} else if (right.isNumber()) {
// ("prefix" + inner + [null]) + 123
// => ("prefix" + inner + "123")
res.setWrapped(
left.prefix,
new BasicEvaluatedExpression()
.setString(right.number + "")
.setRange(right.range),
left.wrappedInnerExpressions
);
} else if (right.isWrapped()) {
// ("prefix1" + inner1 + "postfix1") + ("prefix2" + inner2 + "postfix2")
// ("prefix1" + inner1 + "postfix1" + "prefix2" + inner2 + "postfix2")
res.setWrapped(
left.prefix,
right.postfix,
left.wrappedInnerExpressions &&
right.wrappedInnerExpressions &&
left.wrappedInnerExpressions
.concat(left.postfix ? [left.postfix] : [])
.concat(right.prefix ? [right.prefix] : [])
.concat(right.wrappedInnerExpressions)
);
} else {
// ("prefix" + inner + postfix) + expr
// => ("prefix" + inner + postfix + expr + [null])
res.setWrapped(
left.prefix,
null,
left.wrappedInnerExpressions &&
left.wrappedInnerExpressions.concat(
left.postfix ? [left.postfix, right] : [right]
)
);
}
} else {
if (right.isString()) {
// left + "right"
// => ([null] + left + "right")
res.setWrapped(null, right, [left]);
} else if (right.isWrapped()) {
// left + (prefix + inner + "postfix")
// => ([null] + left + prefix + inner + "postfix")
res.setWrapped(
null,
right.postfix,
right.wrappedInnerExpressions &&
(right.prefix ? [left, right.prefix] : [left]).concat(
right.wrappedInnerExpressions
)
);
} else {
return;
}
}
if (left.couldHaveSideEffects() || right.couldHaveSideEffects())
res.setSideEffects();
res.setRange(expr.range);
return res;
} else if (expr.operator === "-") {
return handleConstOperation((l, r) => l - r);
} else if (expr.operator === "*") {
return handleConstOperation((l, r) => l * r);
} else if (expr.operator === "/") {
return handleConstOperation((l, r) => l / r);
} else if (expr.operator === "**") {
return handleConstOperation((l, r) => l ** r);
} else if (expr.operator === "===") {
return handleStrictEqualityComparison(true);
} else if (expr.operator === "==") {
return handleAbstractEqualityComparison(true);
} else if (expr.operator === "!==") {
return handleStrictEqualityComparison(false);
} else if (expr.operator === "!=") {
return handleAbstractEqualityComparison(false);
} else if (expr.operator === "&") {
return handleConstOperation((l, r) => l & r);
} else if (expr.operator === "|") {
return handleConstOperation((l, r) => l | r);
} else if (expr.operator === "^") {
return handleConstOperation((l, r) => l ^ r);
} else if (expr.operator === ">>>") {
return handleConstOperation((l, r) => l >>> r);
} else if (expr.operator === ">>") {
return handleConstOperation((l, r) => l >> r);
} else if (expr.operator === "<<") {
return handleConstOperation((l, r) => l << r);
} else if (expr.operator === "<") {
return handleConstOperation((l, r) => l < r);
} else if (expr.operator === ">") {
return handleConstOperation((l, r) => l > r);
} else if (expr.operator === "<=") {
return handleConstOperation((l, r) => l <= r);
} else if (expr.operator === ">=") {
return handleConstOperation((l, r) => l >= r);
}
});
this.hooks.evaluate
.for("UnaryExpression")
.tap("JavascriptParser", _expr => {
const expr = /** @type {UnaryExpressionNode} */ (_expr);
const handleConstOperation = fn => {
const argument = this.evaluateExpression(expr.argument);
if (!argument || !argument.isCompileTimeValue()) return;
const result = fn(argument.asCompileTimeValue());
return valueAsExpression(
result,
expr,
argument.couldHaveSideEffects()
);
};
if (expr.operator === "typeof") {
switch (expr.argument.type) {
case "Identifier": {
const res = this.callHooksForName(
this.hooks.evaluateTypeof,
expr.argument.name,
expr
);
if (res !== undefined) return res;
break;
}
case "MetaProperty": {
const res = this.callHooksForName(
this.hooks.evaluateTypeof,
getRootName(expr.argument),
expr
);
if (res !== undefined) return res;
break;
}
case "MemberExpression": {
const res = this.callHooksForExpression(
this.hooks.evaluateTypeof,
expr.argument,
expr
);
if (res !== undefined) return res;
break;
}
case "ChainExpression": {
const res = this.callHooksForExpression(
this.hooks.evaluateTypeof,
expr.argument.expression,
expr
);
if (res !== undefined) return res;
break;
}
case "FunctionExpression": {
return new BasicEvaluatedExpression()
.setString("function")
.setRange(expr.range);
}
}
const arg = this.evaluateExpression(expr.argument);
if (arg.isUnknown()) return;
if (arg.isString()) {
return new BasicEvaluatedExpression()
.setString("string")
.setRange(expr.range);
}
if (arg.isWrapped()) {
return new BasicEvaluatedExpression()
.setString("string")
.setSideEffects()
.setRange(expr.range);
}
if (arg.isUndefined()) {
return new BasicEvaluatedExpression()
.setString("undefined")
.setRange(expr.range);
}
if (arg.isNumber()) {
return new BasicEvaluatedExpression()
.setString("number")
.setRange(expr.range);
}
if (arg.isBigInt()) {
return new BasicEvaluatedExpression()
.setString("bigint")
.setRange(expr.range);
}
if (arg.isBoolean()) {
return new BasicEvaluatedExpression()
.setString("boolean")
.setRange(expr.range);
}
if (arg.isConstArray() || arg.isRegExp() || arg.isNull()) {
return new BasicEvaluatedExpression()
.setString("object")
.setRange(expr.range);
}
if (arg.isArray()) {
return new BasicEvaluatedExpression()
.setString("object")
.setSideEffects(arg.couldHaveSideEffects())
.setRange(expr.range);
}
} else if (expr.operator === "!") {
const argument = this.evaluateExpression(expr.argument);
if (!argument) return;
const bool = argument.asBool();
if (typeof bool !== "boolean") return;
return new BasicEvaluatedExpression()
.setBoolean(!bool)
.setSideEffects(argument.couldHaveSideEffects())
.setRange(expr.range);
} else if (expr.operator === "~") {
return handleConstOperation(v => ~v);
} else if (expr.operator === "+") {
return handleConstOperation(v => +v);
} else if (expr.operator === "-") {
return handleConstOperation(v => -v);
}
});
this.hooks.evaluateTypeof.for("undefined").tap("JavascriptParser", expr => {
return new BasicEvaluatedExpression()
.setString("undefined")
.setRange(expr.range);
});
/**
* @param {string} exprType expression type name
* @param {function(ExpressionNode): GetInfoResult | undefined} getInfo get info
* @returns {void}
*/
const tapEvaluateWithVariableInfo = (exprType, getInfo) => {
/** @type {ExpressionNode | undefined} */
let cachedExpression = undefined;
/** @type {GetInfoResult | undefined} */
let cachedInfo = undefined;
this.hooks.evaluate.for(exprType).tap("JavascriptParser", expr => {
const expression = /** @type {MemberExpressionNode} */ (expr);
const info = getInfo(expr);
if (info !== undefined) {
return this.callHooksForInfoWithFallback(
this.hooks.evaluateIdentifier,
info.name,
name => {
cachedExpression = expression;
cachedInfo = info;
},
name => {
const hook = this.hooks.evaluateDefinedIdentifier.get(name);
if (hook !== undefined) {
return hook.call(expression);
}
},
expression
);
}
});
this.hooks.evaluate
.for(exprType)
.tap({ name: "JavascriptParser", stage: 100 }, expr => {
const info = cachedExpression === expr ? cachedInfo : getInfo(expr);
if (info !== undefined) {
return new BasicEvaluatedExpression()
.setIdentifier(info.name, info.rootInfo, info.getMembers)
.setRange(expr.range);
}
});
this.hooks.finish.tap("JavascriptParser", () => {
// Cleanup for GC
cachedExpression = cachedInfo = undefined;
});
};
tapEvaluateWithVariableInfo("Identifier", expr => {
const info = this.getVariableInfo(
/** @type {IdentifierNode} */ (expr).name
);
if (
typeof info === "string" ||
(info instanceof VariableInfo && typeof info.freeName === "string")
) {
return { name: info, rootInfo: info, getMembers: () => [] };
}
});
tapEvaluateWithVariableInfo("ThisExpression", expr => {
const info = this.getVariableInfo("this");
if (
typeof info === "string" ||
(info instanceof VariableInfo && typeof info.freeName === "string")
) {
return { name: info, rootInfo: info, getMembers: () => [] };
}
});
this.hooks.evaluate.for("MetaProperty").tap("JavascriptParser", expr => {
const metaProperty = /** @type {MetaPropertyNode} */ (expr);
return this.callHooksForName(
this.hooks.evaluateIdentifier,
getRootName(expr),
metaProperty
);
});
tapEvaluateWithVariableInfo("MemberExpression", expr =>
this.getMemberExpressionInfo(
/** @type {MemberExpressionNode} */ (expr),
ALLOWED_MEMBER_TYPES_EXPRESSION
)
);
this.hooks.evaluate.for("CallExpression").tap("JavascriptParser", _expr => {
const expr = /** @type {CallExpressionNode} */ (_expr);
if (
expr.callee.type !== "MemberExpression" ||
expr.callee.property.type !==