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tokenize.js
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Mon, Feb 10, 07:57

tokenize.js
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'use strict'
const SINGLE_QUOTE = "'".charCodeAt(0)
const DOUBLE_QUOTE = '"'.charCodeAt(0)
const BACKSLASH = '\\'.charCodeAt(0)
const SLASH = '/'.charCodeAt(0)
const NEWLINE = '\n'.charCodeAt(0)
const SPACE = ' '.charCodeAt(0)
const FEED = '\f'.charCodeAt(0)
const TAB = '\t'.charCodeAt(0)
const CR = '\r'.charCodeAt(0)
const OPEN_SQUARE = '['.charCodeAt(0)
const CLOSE_SQUARE = ']'.charCodeAt(0)
const OPEN_PARENTHESES = '('.charCodeAt(0)
const CLOSE_PARENTHESES = ')'.charCodeAt(0)
const OPEN_CURLY = '{'.charCodeAt(0)
const CLOSE_CURLY = '}'.charCodeAt(0)
const SEMICOLON = ';'.charCodeAt(0)
const ASTERISK = '*'.charCodeAt(0)
const COLON = ':'.charCodeAt(0)
const AT = '@'.charCodeAt(0)
const RE_AT_END = /[\t\n\f\r "#'()/;[\\\]{}]/g
const RE_WORD_END = /[\t\n\f\r !"#'():;@[\\\]{}]|\/(?=\*)/g
const RE_BAD_BRACKET = /.[\n"'(/\\]/
const RE_HEX_ESCAPE = /[\da-f]/i
module.exports = function tokenizer(input, options = {}) {
let css = input.css.valueOf()
let ignore = options.ignoreErrors
let code, next, quote, content, escape
let escaped, escapePos, prev, n, currentToken
let length = css.length
let pos = 0
let buffer = []
let returned = []
function position() {
return pos
}
function unclosed(what) {
throw input.error('Unclosed ' + what, pos)
}
function endOfFile() {
return returned.length === 0 && pos >= length
}
function nextToken(opts) {
if (returned.length) return returned.pop()
if (pos >= length) return
let ignoreUnclosed = opts ? opts.ignoreUnclosed : false
code = css.charCodeAt(pos)
switch (code) {
case NEWLINE:
case SPACE:
case TAB:
case CR:
case FEED: {
next = pos
do {
next += 1
code = css.charCodeAt(next)
} while (
code === SPACE ||
code === NEWLINE ||
code === TAB ||
code === CR ||
code === FEED
)
currentToken = ['space', css.slice(pos, next)]
pos = next - 1
break
}
case OPEN_SQUARE:
case CLOSE_SQUARE:
case OPEN_CURLY:
case CLOSE_CURLY:
case COLON:
case SEMICOLON:
case CLOSE_PARENTHESES: {
let controlChar = String.fromCharCode(code)
currentToken = [controlChar, controlChar, pos]
break
}
case OPEN_PARENTHESES: {
prev = buffer.length ? buffer.pop()[1] : ''
n = css.charCodeAt(pos + 1)
if (
prev === 'url' &&
n !== SINGLE_QUOTE &&
n !== DOUBLE_QUOTE &&
n !== SPACE &&
n !== NEWLINE &&
n !== TAB &&
n !== FEED &&
n !== CR
) {
next = pos
do {
escaped = false
next = css.indexOf(')', next + 1)
if (next === -1) {
if (ignore || ignoreUnclosed) {
next = pos
break
} else {
unclosed('bracket')
}
}
escapePos = next
while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
escapePos -= 1
escaped = !escaped
}
} while (escaped)
currentToken = ['brackets', css.slice(pos, next + 1), pos, next]
pos = next
} else {
next = css.indexOf(')', pos + 1)
content = css.slice(pos, next + 1)
if (next === -1 || RE_BAD_BRACKET.test(content)) {
currentToken = ['(', '(', pos]
} else {
currentToken = ['brackets', content, pos, next]
pos = next
}
}
break
}
case SINGLE_QUOTE:
case DOUBLE_QUOTE: {
quote = code === SINGLE_QUOTE ? "'" : '"'
next = pos
do {
escaped = false
next = css.indexOf(quote, next + 1)
if (next === -1) {
if (ignore || ignoreUnclosed) {
next = pos + 1
break
} else {
unclosed('string')
}
}
escapePos = next
while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
escapePos -= 1
escaped = !escaped
}
} while (escaped)
currentToken = ['string', css.slice(pos, next + 1), pos, next]
pos = next
break
}
case AT: {
RE_AT_END.lastIndex = pos + 1
RE_AT_END.test(css)
if (RE_AT_END.lastIndex === 0) {
next = css.length - 1
} else {
next = RE_AT_END.lastIndex - 2
}
currentToken = ['at-word', css.slice(pos, next + 1), pos, next]
pos = next
break
}
case BACKSLASH: {
next = pos
escape = true
while (css.charCodeAt(next + 1) === BACKSLASH) {
next += 1
escape = !escape
}
code = css.charCodeAt(next + 1)
if (
escape &&
code !== SLASH &&
code !== SPACE &&
code !== NEWLINE &&
code !== TAB &&
code !== CR &&
code !== FEED
) {
next += 1
if (RE_HEX_ESCAPE.test(css.charAt(next))) {
while (RE_HEX_ESCAPE.test(css.charAt(next + 1))) {
next += 1
}
if (css.charCodeAt(next + 1) === SPACE) {
next += 1
}
}
}
currentToken = ['word', css.slice(pos, next + 1), pos, next]
pos = next
break
}
default: {
if (code === SLASH && css.charCodeAt(pos + 1) === ASTERISK) {
next = css.indexOf('*/', pos + 2) + 1
if (next === 0) {
if (ignore || ignoreUnclosed) {
next = css.length
} else {
unclosed('comment')
}
}
currentToken = ['comment', css.slice(pos, next + 1), pos, next]
pos = next
} else {
RE_WORD_END.lastIndex = pos + 1
RE_WORD_END.test(css)
if (RE_WORD_END.lastIndex === 0) {
next = css.length - 1
} else {
next = RE_WORD_END.lastIndex - 2
}
currentToken = ['word', css.slice(pos, next + 1), pos, next]
buffer.push(currentToken)
pos = next
}
break
}
}
pos++
return currentToken
}
function back(token) {
returned.push(token)
}
return {
back,
nextToken,
endOfFile,
position
}
}

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