/usr/lib/nodejs/acorn/parseutil.js is in node-acorn 5.4.1+ds1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | "use strict";
exports.DestructuringErrors = DestructuringErrors;
var $$tokentype$$ = require("./tokentype"), $$state$$ = require("./state"), $$whitespace$$ = require("./whitespace");
const pp = $$state$$.Parser.prototype
// ## Parser utilities
const literal = /^(?:'((?:\\.|[^'])*?)'|"((?:\\.|[^"])*?)"|;)/
pp.strictDirective = function(start) {
for (;;) {
$$whitespace$$.skipWhiteSpace.lastIndex = start
start += $$whitespace$$.skipWhiteSpace.exec(this.input)[0].length
let match = literal.exec(this.input.slice(start))
if (!match) return false
if ((match[1] || match[2]) == "use strict") return true
start += match[0].length
}
}
// Predicate that tests whether the next token is of the given
// type, and if yes, consumes it as a side effect.
pp.eat = function(type) {
if (this.type === type) {
this.next()
return true
} else {
return false
}
}
// Tests whether parsed token is a contextual keyword.
pp.isContextual = function(name) {
return this.type === $$tokentype$$.types.name && this.value === name && !this.containsEsc;
}
// Consumes contextual keyword if possible.
pp.eatContextual = function(name) {
if (!this.isContextual(name)) return false
this.next()
return true
}
// Asserts that following token is given contextual keyword.
pp.expectContextual = function(name) {
if (!this.eatContextual(name)) this.unexpected()
}
// Test whether a semicolon can be inserted at the current position.
pp.canInsertSemicolon = function() {
return this.type === $$tokentype$$.types.eof ||
this.type === $$tokentype$$.types.braceR ||
$$whitespace$$.lineBreak.test(this.input.slice(this.lastTokEnd, this.start));
}
pp.insertSemicolon = function() {
if (this.canInsertSemicolon()) {
if (this.options.onInsertedSemicolon)
this.options.onInsertedSemicolon(this.lastTokEnd, this.lastTokEndLoc)
return true
}
}
// Consume a semicolon, or, failing that, see if we are allowed to
// pretend that there is a semicolon at this position.
pp.semicolon = function() {
if (!this.eat($$tokentype$$.types.semi) && !this.insertSemicolon()) this.unexpected()
}
pp.afterTrailingComma = function(tokType, notNext) {
if (this.type == tokType) {
if (this.options.onTrailingComma)
this.options.onTrailingComma(this.lastTokStart, this.lastTokStartLoc)
if (!notNext)
this.next()
return true
}
}
// Expect a token of a given type. If found, consume it, otherwise,
// raise an unexpected token error.
pp.expect = function(type) {
this.eat(type) || this.unexpected()
}
// Raise an unexpected token error.
pp.unexpected = function(pos) {
this.raise(pos != null ? pos : this.start, "Unexpected token")
}
function DestructuringErrors() {
this.shorthandAssign =
this.trailingComma =
this.parenthesizedAssign =
this.parenthesizedBind =
this.doubleProto =
-1
}
pp.checkPatternErrors = function(refDestructuringErrors, isAssign) {
if (!refDestructuringErrors) return
if (refDestructuringErrors.trailingComma > -1)
this.raiseRecoverable(refDestructuringErrors.trailingComma, "Comma is not permitted after the rest element")
let parens = isAssign ? refDestructuringErrors.parenthesizedAssign : refDestructuringErrors.parenthesizedBind
if (parens > -1) this.raiseRecoverable(parens, "Parenthesized pattern")
}
pp.checkExpressionErrors = function(refDestructuringErrors, andThrow) {
if (!refDestructuringErrors) return false
let {shorthandAssign, doubleProto} = refDestructuringErrors
if (!andThrow) return shorthandAssign >= 0 || doubleProto >= 0
if (shorthandAssign >= 0)
this.raise(shorthandAssign, "Shorthand property assignments are valid only in destructuring patterns")
if (doubleProto >= 0)
this.raiseRecoverable(doubleProto, "Redefinition of __proto__ property")
}
pp.checkYieldAwaitInDefaultParams = function() {
if (this.yieldPos && (!this.awaitPos || this.yieldPos < this.awaitPos))
this.raise(this.yieldPos, "Yield expression cannot be a default value")
if (this.awaitPos)
this.raise(this.awaitPos, "Await expression cannot be a default value")
}
pp.isSimpleAssignTarget = function(expr) {
if (expr.type === "ParenthesizedExpression")
return this.isSimpleAssignTarget(expr.expression)
return expr.type === "Identifier" || expr.type === "MemberExpression"
}
|