Current File : /home/opti/workflow/node_modules/acorn/src/tokenize.js
import {isIdentifierStart, isIdentifierChar} from "./identifier"
import {types as tt, keywords as keywordTypes} from "./tokentype"
import {Parser} from "./state"
import {SourceLocation} from "./locutil"
import {lineBreak, lineBreakG, isNewLine, nonASCIIwhitespace} from "./whitespace"
// Object type used to represent tokens. Note that normally, tokens
// simply exist as properties on the parser object. This is only
// used for the onToken callback and the external tokenizer.
export class Token {
constructor(p) {
this.type = p.type
this.value = p.value
this.start = p.start
this.end = p.end
if (p.options.locations)
this.loc = new SourceLocation(p, p.startLoc, p.endLoc)
if (p.options.ranges)
this.range = [p.start, p.end]
}
}
// ## Tokenizer
const pp = Parser.prototype
// Are we running under Rhino?
const isRhino = typeof Packages == "object" && Object.prototype.toString.call(Packages) == "[object JavaPackage]"
// Move to the next token
pp.next = function() {
if (this.options.onToken)
this.options.onToken(new Token(this))
this.lastTokEnd = this.end
this.lastTokStart = this.start
this.lastTokEndLoc = this.endLoc
this.lastTokStartLoc = this.startLoc
this.nextToken()
}
pp.getToken = function() {
this.next()
return new Token(this)
}
// If we're in an ES6 environment, make parsers iterable
if (typeof Symbol !== "undefined")
pp[Symbol.iterator] = function () {
let self = this
return {next: function () {
let token = self.getToken()
return {
done: token.type === tt.eof,
value: token
}
}}
}
// Toggle strict mode. Re-reads the next number or string to please
// pedantic tests (`"use strict"; 010;` should fail).
pp.setStrict = function(strict) {
this.strict = strict
if (this.type !== tt.num && this.type !== tt.string) return
this.pos = this.start
if (this.options.locations) {
while (this.pos < this.lineStart) {
this.lineStart = this.input.lastIndexOf("\n", this.lineStart - 2) + 1
--this.curLine
}
}
this.nextToken()
}
pp.curContext = function() {
return this.context[this.context.length - 1]
}
// Read a single token, updating the parser object's token-related
// properties.
pp.nextToken = function() {
let curContext = this.curContext()
if (!curContext || !curContext.preserveSpace) this.skipSpace()
this.start = this.pos
if (this.options.locations) this.startLoc = this.curPosition()
if (this.pos >= this.input.length) return this.finishToken(tt.eof)
if (curContext.override) return curContext.override(this)
else this.readToken(this.fullCharCodeAtPos())
}
pp.readToken = function(code) {
// Identifier or keyword. '\uXXXX' sequences are allowed in
// identifiers, so '\' also dispatches to that.
if (isIdentifierStart(code, this.options.ecmaVersion >= 6) || code === 92 /* '\' */)
return this.readWord()
return this.getTokenFromCode(code)
}
pp.fullCharCodeAtPos = function() {
let code = this.input.charCodeAt(this.pos)
if (code <= 0xd7ff || code >= 0xe000) return code
let next = this.input.charCodeAt(this.pos + 1)
return (code << 10) + next - 0x35fdc00
}
pp.skipBlockComment = function() {
let startLoc = this.options.onComment && this.curPosition()
let start = this.pos, end = this.input.indexOf("*/", this.pos += 2)
if (end === -1) this.raise(this.pos - 2, "Unterminated comment")
this.pos = end + 2
if (this.options.locations) {
lineBreakG.lastIndex = start
let match
while ((match = lineBreakG.exec(this.input)) && match.index < this.pos) {
++this.curLine
this.lineStart = match.index + match[0].length
}
}
if (this.options.onComment)
this.options.onComment(true, this.input.slice(start + 2, end), start, this.pos,
startLoc, this.curPosition())
}
pp.skipLineComment = function(startSkip) {
let start = this.pos
let startLoc = this.options.onComment && this.curPosition()
let ch = this.input.charCodeAt(this.pos+=startSkip)
while (this.pos < this.input.length && ch !== 10 && ch !== 13 && ch !== 8232 && ch !== 8233) {
++this.pos
ch = this.input.charCodeAt(this.pos)
}
if (this.options.onComment)
this.options.onComment(false, this.input.slice(start + startSkip, this.pos), start, this.pos,
startLoc, this.curPosition())
}
// Called at the start of the parse and after every token. Skips
// whitespace and comments, and.
pp.skipSpace = function() {
loop: while (this.pos < this.input.length) {
let ch = this.input.charCodeAt(this.pos)
switch (ch) {
case 32: case 160: // ' '
++this.pos
break
case 13:
if (this.input.charCodeAt(this.pos + 1) === 10) {
++this.pos
}
case 10: case 8232: case 8233:
++this.pos
if (this.options.locations) {
++this.curLine
this.lineStart = this.pos
}
break
case 47: // '/'
switch (this.input.charCodeAt(this.pos + 1)) {
case 42: // '*'
this.skipBlockComment()
break
case 47:
this.skipLineComment(2)
break
default:
break loop
}
break
default:
if (ch > 8 && ch < 14 || ch >= 5760 && nonASCIIwhitespace.test(String.fromCharCode(ch))) {
++this.pos
} else {
break loop
}
}
}
}
// Called at the end of every token. Sets `end`, `val`, and
// maintains `context` and `exprAllowed`, and skips the space after
// the token, so that the next one's `start` will point at the
// right position.
pp.finishToken = function(type, val) {
this.end = this.pos
if (this.options.locations) this.endLoc = this.curPosition()
let prevType = this.type
this.type = type
this.value = val
this.updateContext(prevType)
}
// ### Token reading
// This is the function that is called to fetch the next token. It
// is somewhat obscure, because it works in character codes rather
// than characters, and because operator parsing has been inlined
// into it.
//
// All in the name of speed.
//
pp.readToken_dot = function() {
let next = this.input.charCodeAt(this.pos + 1)
if (next >= 48 && next <= 57) return this.readNumber(true)
let next2 = this.input.charCodeAt(this.pos + 2)
if (this.options.ecmaVersion >= 6 && next === 46 && next2 === 46) { // 46 = dot '.'
this.pos += 3
return this.finishToken(tt.ellipsis)
} else {
++this.pos
return this.finishToken(tt.dot)
}
}
pp.readToken_slash = function() { // '/'
let next = this.input.charCodeAt(this.pos + 1)
if (this.exprAllowed) {++this.pos; return this.readRegexp()}
if (next === 61) return this.finishOp(tt.assign, 2)
return this.finishOp(tt.slash, 1)
}
pp.readToken_mult_modulo_exp = function(code) { // '%*'
let next = this.input.charCodeAt(this.pos + 1)
let size = 1
let tokentype = code === 42 ? tt.star : tt.modulo
// exponentiation operator ** and **=
if (this.options.ecmaVersion >= 7 && next === 42) {
++size
tokentype = tt.starstar
next = this.input.charCodeAt(this.pos + 2)
}
if (next === 61) return this.finishOp(tt.assign, size + 1)
return this.finishOp(tokentype, size)
}
pp.readToken_pipe_amp = function(code) { // '|&'
let next = this.input.charCodeAt(this.pos + 1)
if (next === code) return this.finishOp(code === 124 ? tt.logicalOR : tt.logicalAND, 2)
if (next === 61) return this.finishOp(tt.assign, 2)
return this.finishOp(code === 124 ? tt.bitwiseOR : tt.bitwiseAND, 1)
}
pp.readToken_caret = function() { // '^'
let next = this.input.charCodeAt(this.pos + 1)
if (next === 61) return this.finishOp(tt.assign, 2)
return this.finishOp(tt.bitwiseXOR, 1)
}
pp.readToken_plus_min = function(code) { // '+-'
let next = this.input.charCodeAt(this.pos + 1)
if (next === code) {
if (next == 45 && this.input.charCodeAt(this.pos + 2) == 62 &&
lineBreak.test(this.input.slice(this.lastTokEnd, this.pos))) {
// A `-->` line comment
this.skipLineComment(3)
this.skipSpace()
return this.nextToken()
}
return this.finishOp(tt.incDec, 2)
}
if (next === 61) return this.finishOp(tt.assign, 2)
return this.finishOp(tt.plusMin, 1)
}
pp.readToken_lt_gt = function(code) { // '<>'
let next = this.input.charCodeAt(this.pos + 1)
let size = 1
if (next === code) {
size = code === 62 && this.input.charCodeAt(this.pos + 2) === 62 ? 3 : 2
if (this.input.charCodeAt(this.pos + size) === 61) return this.finishOp(tt.assign, size + 1)
return this.finishOp(tt.bitShift, size)
}
if (next == 33 && code == 60 && this.input.charCodeAt(this.pos + 2) == 45 &&
this.input.charCodeAt(this.pos + 3) == 45) {
if (this.inModule) this.unexpected()
// `<!--`, an XML-style comment that should be interpreted as a line comment
this.skipLineComment(4)
this.skipSpace()
return this.nextToken()
}
if (next === 61) size = 2
return this.finishOp(tt.relational, size)
}
pp.readToken_eq_excl = function(code) { // '=!'
let next = this.input.charCodeAt(this.pos + 1)
if (next === 61) return this.finishOp(tt.equality, this.input.charCodeAt(this.pos + 2) === 61 ? 3 : 2)
if (code === 61 && next === 62 && this.options.ecmaVersion >= 6) { // '=>'
this.pos += 2
return this.finishToken(tt.arrow)
}
return this.finishOp(code === 61 ? tt.eq : tt.prefix, 1)
}
pp.getTokenFromCode = function(code) {
switch (code) {
// The interpretation of a dot depends on whether it is followed
// by a digit or another two dots.
case 46: // '.'
return this.readToken_dot()
// Punctuation tokens.
case 40: ++this.pos; return this.finishToken(tt.parenL)
case 41: ++this.pos; return this.finishToken(tt.parenR)
case 59: ++this.pos; return this.finishToken(tt.semi)
case 44: ++this.pos; return this.finishToken(tt.comma)
case 91: ++this.pos; return this.finishToken(tt.bracketL)
case 93: ++this.pos; return this.finishToken(tt.bracketR)
case 123: ++this.pos; return this.finishToken(tt.braceL)
case 125: ++this.pos; return this.finishToken(tt.braceR)
case 58: ++this.pos; return this.finishToken(tt.colon)
case 63: ++this.pos; return this.finishToken(tt.question)
case 96: // '`'
if (this.options.ecmaVersion < 6) break
++this.pos
return this.finishToken(tt.backQuote)
case 48: // '0'
let next = this.input.charCodeAt(this.pos + 1)
if (next === 120 || next === 88) return this.readRadixNumber(16) // '0x', '0X' - hex number
if (this.options.ecmaVersion >= 6) {
if (next === 111 || next === 79) return this.readRadixNumber(8) // '0o', '0O' - octal number
if (next === 98 || next === 66) return this.readRadixNumber(2) // '0b', '0B' - binary number
}
// Anything else beginning with a digit is an integer, octal
// number, or float.
case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
return this.readNumber(false)
// Quotes produce strings.
case 34: case 39: // '"', "'"
return this.readString(code)
// Operators are parsed inline in tiny state machines. '=' (61) is
// often referred to. `finishOp` simply skips the amount of
// characters it is given as second argument, and returns a token
// of the type given by its first argument.
case 47: // '/'
return this.readToken_slash()
case 37: case 42: // '%*'
return this.readToken_mult_modulo_exp(code)
case 124: case 38: // '|&'
return this.readToken_pipe_amp(code)
case 94: // '^'
return this.readToken_caret()
case 43: case 45: // '+-'
return this.readToken_plus_min(code)
case 60: case 62: // '<>'
return this.readToken_lt_gt(code)
case 61: case 33: // '=!'
return this.readToken_eq_excl(code)
case 126: // '~'
return this.finishOp(tt.prefix, 1)
}
this.raise(this.pos, "Unexpected character '" + codePointToString(code) + "'")
}
pp.finishOp = function(type, size) {
let str = this.input.slice(this.pos, this.pos + size)
this.pos += size
return this.finishToken(type, str)
}
// Parse a regular expression. Some context-awareness is necessary,
// since a '/' inside a '[]' set does not end the expression.
function tryCreateRegexp(src, flags, throwErrorAt, parser) {
try {
return new RegExp(src, flags)
} catch (e) {
if (throwErrorAt !== undefined) {
if (e instanceof SyntaxError) parser.raise(throwErrorAt, "Error parsing regular expression: " + e.message)
throw e
}
}
}
var regexpUnicodeSupport = !!tryCreateRegexp("\uffff", "u")
pp.readRegexp = function() {
let escaped, inClass, start = this.pos
for (;;) {
if (this.pos >= this.input.length) this.raise(start, "Unterminated regular expression")
let ch = this.input.charAt(this.pos)
if (lineBreak.test(ch)) this.raise(start, "Unterminated regular expression")
if (!escaped) {
if (ch === "[") inClass = true
else if (ch === "]" && inClass) inClass = false
else if (ch === "/" && !inClass) break
escaped = ch === "\\"
} else escaped = false
++this.pos
}
let content = this.input.slice(start, this.pos)
++this.pos
// Need to use `readWord1` because '\uXXXX' sequences are allowed
// here (don't ask).
let mods = this.readWord1()
let tmp = content, tmpFlags = ""
if (mods) {
let validFlags = /^[gim]*$/
if (this.options.ecmaVersion >= 6) validFlags = /^[gimuy]*$/
if (!validFlags.test(mods)) this.raise(start, "Invalid regular expression flag")
if (mods.indexOf("u") >= 0) {
if (regexpUnicodeSupport) {
tmpFlags = "u"
} else {
// Replace each astral symbol and every Unicode escape sequence that
// possibly represents an astral symbol or a paired surrogate with a
// single ASCII symbol to avoid throwing on regular expressions that
// are only valid in combination with the `/u` flag.
// Note: replacing with the ASCII symbol `x` might cause false
// negatives in unlikely scenarios. For example, `[\u{61}-b]` is a
// perfectly valid pattern that is equivalent to `[a-b]`, but it would
// be replaced by `[x-b]` which throws an error.
tmp = tmp.replace(/\\u\{([0-9a-fA-F]+)\}/g, (_match, code, offset) => {
code = Number("0x" + code)
if (code > 0x10FFFF) this.raise(start + offset + 3, "Code point out of bounds")
return "x"
})
tmp = tmp.replace(/\\u([a-fA-F0-9]{4})|[\uD800-\uDBFF][\uDC00-\uDFFF]/g, "x")
tmpFlags = tmpFlags.replace("u", "")
}
}
}
// Detect invalid regular expressions.
let value = null
// Rhino's regular expression parser is flaky and throws uncatchable exceptions,
// so don't do detection if we are running under Rhino
if (!isRhino) {
tryCreateRegexp(tmp, tmpFlags, start, this)
// Get a regular expression object for this pattern-flag pair, or `null` in
// case the current environment doesn't support the flags it uses.
value = tryCreateRegexp(content, mods)
}
return this.finishToken(tt.regexp, {pattern: content, flags: mods, value: value})
}
// Read an integer in the given radix. Return null if zero digits
// were read, the integer value otherwise. When `len` is given, this
// will return `null` unless the integer has exactly `len` digits.
pp.readInt = function(radix, len) {
let start = this.pos, total = 0
for (let i = 0, e = len == null ? Infinity : len; i < e; ++i) {
let code = this.input.charCodeAt(this.pos), val
if (code >= 97) val = code - 97 + 10 // a
else if (code >= 65) val = code - 65 + 10 // A
else if (code >= 48 && code <= 57) val = code - 48 // 0-9
else val = Infinity
if (val >= radix) break
++this.pos
total = total * radix + val
}
if (this.pos === start || len != null && this.pos - start !== len) return null
return total
}
pp.readRadixNumber = function(radix) {
this.pos += 2 // 0x
let val = this.readInt(radix)
if (val == null) this.raise(this.start + 2, "Expected number in radix " + radix)
if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
return this.finishToken(tt.num, val)
}
// Read an integer, octal integer, or floating-point number.
pp.readNumber = function(startsWithDot) {
let start = this.pos, isFloat = false, octal = this.input.charCodeAt(this.pos) === 48
if (!startsWithDot && this.readInt(10) === null) this.raise(start, "Invalid number")
let next = this.input.charCodeAt(this.pos)
if (next === 46) { // '.'
++this.pos
this.readInt(10)
isFloat = true
next = this.input.charCodeAt(this.pos)
}
if (next === 69 || next === 101) { // 'eE'
next = this.input.charCodeAt(++this.pos)
if (next === 43 || next === 45) ++this.pos // '+-'
if (this.readInt(10) === null) this.raise(start, "Invalid number")
isFloat = true
}
if (isIdentifierStart(this.fullCharCodeAtPos())) this.raise(this.pos, "Identifier directly after number")
let str = this.input.slice(start, this.pos), val
if (isFloat) val = parseFloat(str)
else if (!octal || str.length === 1) val = parseInt(str, 10)
else if (/[89]/.test(str) || this.strict) this.raise(start, "Invalid number")
else val = parseInt(str, 8)
return this.finishToken(tt.num, val)
}
// Read a string value, interpreting backslash-escapes.
pp.readCodePoint = function() {
let ch = this.input.charCodeAt(this.pos), code
if (ch === 123) {
if (this.options.ecmaVersion < 6) this.unexpected()
let codePos = ++this.pos
code = this.readHexChar(this.input.indexOf('}', this.pos) - this.pos)
++this.pos
if (code > 0x10FFFF) this.raise(codePos, "Code point out of bounds")
} else {
code = this.readHexChar(4)
}
return code
}
function codePointToString(code) {
// UTF-16 Decoding
if (code <= 0xFFFF) return String.fromCharCode(code)
code -= 0x10000
return String.fromCharCode((code >> 10) + 0xD800, (code & 1023) + 0xDC00)
}
pp.readString = function(quote) {
let out = "", chunkStart = ++this.pos
for (;;) {
if (this.pos >= this.input.length) this.raise(this.start, "Unterminated string constant")
let ch = this.input.charCodeAt(this.pos)
if (ch === quote) break
if (ch === 92) { // '\'
out += this.input.slice(chunkStart, this.pos)
out += this.readEscapedChar(false)
chunkStart = this.pos
} else {
if (isNewLine(ch)) this.raise(this.start, "Unterminated string constant")
++this.pos
}
}
out += this.input.slice(chunkStart, this.pos++)
return this.finishToken(tt.string, out)
}
// Reads template string tokens.
pp.readTmplToken = function() {
let out = "", chunkStart = this.pos
for (;;) {
if (this.pos >= this.input.length) this.raise(this.start, "Unterminated template")
let ch = this.input.charCodeAt(this.pos)
if (ch === 96 || ch === 36 && this.input.charCodeAt(this.pos + 1) === 123) { // '`', '${'
if (this.pos === this.start && this.type === tt.template) {
if (ch === 36) {
this.pos += 2
return this.finishToken(tt.dollarBraceL)
} else {
++this.pos
return this.finishToken(tt.backQuote)
}
}
out += this.input.slice(chunkStart, this.pos)
return this.finishToken(tt.template, out)
}
if (ch === 92) { // '\'
out += this.input.slice(chunkStart, this.pos)
out += this.readEscapedChar(true)
chunkStart = this.pos
} else if (isNewLine(ch)) {
out += this.input.slice(chunkStart, this.pos)
++this.pos
switch (ch) {
case 13:
if (this.input.charCodeAt(this.pos) === 10) ++this.pos
case 10:
out += "\n"
break
default:
out += String.fromCharCode(ch)
break
}
if (this.options.locations) {
++this.curLine
this.lineStart = this.pos
}
chunkStart = this.pos
} else {
++this.pos
}
}
}
// Used to read escaped characters
pp.readEscapedChar = function(inTemplate) {
let ch = this.input.charCodeAt(++this.pos)
++this.pos
switch (ch) {
case 110: return "\n" // 'n' -> '\n'
case 114: return "\r" // 'r' -> '\r'
case 120: return String.fromCharCode(this.readHexChar(2)) // 'x'
case 117: return codePointToString(this.readCodePoint()) // 'u'
case 116: return "\t" // 't' -> '\t'
case 98: return "\b" // 'b' -> '\b'
case 118: return "\u000b" // 'v' -> '\u000b'
case 102: return "\f" // 'f' -> '\f'
case 13: if (this.input.charCodeAt(this.pos) === 10) ++this.pos // '\r\n'
case 10: // ' \n'
if (this.options.locations) { this.lineStart = this.pos; ++this.curLine }
return ""
default:
if (ch >= 48 && ch <= 55) {
let octalStr = this.input.substr(this.pos - 1, 3).match(/^[0-7]+/)[0]
let octal = parseInt(octalStr, 8)
if (octal > 255) {
octalStr = octalStr.slice(0, -1)
octal = parseInt(octalStr, 8)
}
if (octalStr !== "0" && (this.strict || inTemplate)) {
this.raise(this.pos - 2, "Octal literal in strict mode")
}
this.pos += octalStr.length - 1
return String.fromCharCode(octal)
}
return String.fromCharCode(ch)
}
}
// Used to read character escape sequences ('\x', '\u', '\U').
pp.readHexChar = function(len) {
let codePos = this.pos
let n = this.readInt(16, len)
if (n === null) this.raise(codePos, "Bad character escape sequence")
return n
}
// Read an identifier, and return it as a string. Sets `this.containsEsc`
// to whether the word contained a '\u' escape.
//
// Incrementally adds only escaped chars, adding other chunks as-is
// as a micro-optimization.
pp.readWord1 = function() {
this.containsEsc = false
let word = "", first = true, chunkStart = this.pos
let astral = this.options.ecmaVersion >= 6
while (this.pos < this.input.length) {
let ch = this.fullCharCodeAtPos()
if (isIdentifierChar(ch, astral)) {
this.pos += ch <= 0xffff ? 1 : 2
} else if (ch === 92) { // "\"
this.containsEsc = true
word += this.input.slice(chunkStart, this.pos)
let escStart = this.pos
if (this.input.charCodeAt(++this.pos) != 117) // "u"
this.raise(this.pos, "Expecting Unicode escape sequence \\uXXXX")
++this.pos
let esc = this.readCodePoint()
if (!(first ? isIdentifierStart : isIdentifierChar)(esc, astral))
this.raise(escStart, "Invalid Unicode escape")
word += codePointToString(esc)
chunkStart = this.pos
} else {
break
}
first = false
}
return word + this.input.slice(chunkStart, this.pos)
}
// Read an identifier or keyword token. Will check for reserved
// words when necessary.
pp.readWord = function() {
let word = this.readWord1()
let type = tt.name
if ((this.options.ecmaVersion >= 6 || !this.containsEsc) && this.keywords.test(word))
type = keywordTypes[word]
return this.finishToken(type, word)
}
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