/
tokenize.es6
312 lines (273 loc) · 7.6 KB
/
tokenize.es6
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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 = /[ \n\t\r\f{}()'"\\;/[\]#]/g
const RE_WORD_END = /[ \n\t\r\f(){}:;@!'"\\\][#]|\/(?=\*)/g
const RE_BAD_BRACKET = /.[\\/("'\n]/
const RE_HEX_ESCAPE = /[a-f0-9]/i
export default function tokenizer (input, options = {}) {
let css = input.css.valueOf()
let ignore = options.ignoreErrors
let code, next, quote, lines, last, content, escape
let nextLine, nextOffset, escaped, escapePos, prev, n, currentToken
let length = css.length
let offset = -1
let line = 1
let pos = 0
let buffer = []
let returned = []
function unclosed (what) {
throw input.error('Unclosed ' + what, line, pos - offset)
}
function endOfFile () {
return returned.length === 0 && pos >= length
}
function nextToken () {
if (returned.length) return returned.pop()
if (pos >= length) return
code = css.charCodeAt(pos)
if (
code === NEWLINE || code === FEED ||
(code === CR && css.charCodeAt(pos + 1) !== NEWLINE)
) {
offset = pos
line += 1
}
switch (code) {
case NEWLINE:
case SPACE:
case TAB:
case CR:
case FEED:
next = pos
do {
next += 1
code = css.charCodeAt(next)
if (code === NEWLINE) {
offset = next
line += 1
}
} 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, line, pos - offset]
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) {
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),
line, pos - offset,
line, next - offset
]
pos = next
} else {
next = css.indexOf(')', pos + 1)
content = css.slice(pos, next + 1)
if (next === -1 || RE_BAD_BRACKET.test(content)) {
currentToken = ['(', '(', line, pos - offset]
} else {
currentToken = ['brackets', content,
line, pos - offset,
line, next - offset
]
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) {
next = pos + 1
break
} else {
unclosed('string')
}
}
escapePos = next
while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
escapePos -= 1
escaped = !escaped
}
} while (escaped)
content = css.slice(pos, next + 1)
lines = content.split('\n')
last = lines.length - 1
if (last > 0) {
nextLine = line + last
nextOffset = next - lines[last].length
} else {
nextLine = line
nextOffset = offset
}
currentToken = ['string', css.slice(pos, next + 1),
line, pos - offset,
nextLine, next - nextOffset
]
offset = nextOffset
line = nextLine
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),
line, pos - offset,
line, next - offset
]
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),
line, pos - offset,
line, next - offset
]
pos = next
break
default:
if (code === SLASH && css.charCodeAt(pos + 1) === ASTERISK) {
next = css.indexOf('*/', pos + 2) + 1
if (next === 0) {
if (ignore) {
next = css.length
} else {
unclosed('comment')
}
}
content = css.slice(pos, next + 1)
lines = content.split('\n')
last = lines.length - 1
if (last > 0) {
nextLine = line + last
nextOffset = next - lines[last].length
} else {
nextLine = line
nextOffset = offset
}
currentToken = ['comment', content,
line, pos - offset,
nextLine, next - nextOffset
]
offset = nextOffset
line = nextLine
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),
line, pos - offset,
line, next - offset
]
buffer.push(currentToken)
pos = next
}
break
}
pos++
return currentToken
}
function back (token) {
returned.push(token)
}
return {
back,
nextToken,
endOfFile
}
}