Press n or j to go to the next uncovered block, b, p or k for the previous block.
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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_PARENTHESES = '('.charCodeAt(0)
const CLOSE_PARENTHESES = ')'.charCodeAt(0)
const OPEN_CURLY = '{'.charCodeAt(0)
const CLOSE_CURLY = '}'.charCodeAt(0)
const SEMICOLON = ';'.charCodeAt(0)
const ASTERICK = '*'.charCodeAt(0)
const COLON = ':'.charCodeAt(0)
const AT = '@'.charCodeAt(0)
const COMMA = ','.charCodeAt(0)
const RE_AT_END = /[\t\n\f\r "'()/;\\{]/g
const RE_NEW_LINE = /[\n\f\r]/g
const RE_WORD_END = /[\t\n\f\r !"'(),:;@\\{}]|\/(?=\*)/g
const RE_BAD_BRACKET = /.[\n"'(/\\]/
module.exports = function tokenize(input) {
let tokens = []
let css = input.css.valueOf()
let code,
next,
quote,
lines,
last,
content,
escape,
nextLine,
nextOffset,
escaped,
escapePos,
prev,
n
let length = css.length
let offset = -1
let line = 1
let pos = 0
function unclosed(what) {
throw input.error('Unclosed ' + what, line, pos - offset)
}
while (pos < length) {
code = css.charCodeAt(pos)
if (
code === NEWLINE ||
code === FEED ||
(code === CR && css.charCodeAt(pos + 1) !== NEWLINE)
) {
offset = pos
line += 1
}
switch (code) {
case CR:
if (css.charCodeAt(pos + 1) === NEWLINE) {
offset = pos
line += 1
pos += 1
tokens.push(['newline', '\r\n', line - 1])
} else {
tokens.push(['newline', '\r', line - 1])
}
break
case FEED:
case NEWLINE:
tokens.push(['newline', css.slice(pos, pos + 1), line - 1])
break
case SPACE:
case TAB:
next = pos
do {
next += 1
code = css.charCodeAt(next)
} while (code === SPACE || code === TAB)
tokens.push(['space', css.slice(pos, next)])
pos = next - 1
break
case OPEN_CURLY:
tokens.push(['{', '{', line, pos - offset])
break
case CLOSE_CURLY:
tokens.push(['}', '}', line, pos - offset])
break
case COLON:
tokens.push([':', ':', line, pos - offset])
break
case SEMICOLON:
tokens.push([';', ';', line, pos - offset])
break
case COMMA:
tokens.push([',', ',', line, pos - offset])
break
case OPEN_PARENTHESES:
prev = tokens.length ? tokens[tokens.length - 1][1] : ''
n = css.charCodeAt(pos + 1)
Iif (
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) unclosed('bracket')
escapePos = next
while (css.charCodeAt(escapePos - 1) === BACKSLASH) {
escapePos -= 1
escaped = !escaped
}
} while (escaped)
tokens.push([
'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)) {
tokens.push(['(', '(', line, pos - offset])
} else {
tokens.push([
'brackets',
content,
line,
pos - offset,
line,
next - offset
])
pos = next
}
}
break
case CLOSE_PARENTHESES:
tokens.push([')', ')', line, pos - offset])
break
case SINGLE_QUOTE:
case DOUBLE_QUOTE:
quote = code === SINGLE_QUOTE ? "'" : '"'
next = pos
do {
escaped = false
next = css.indexOf(quote, next + 1)
Iif (next === -1) unclosed('quote')
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
Iif (last > 0) {
nextLine = line + last
nextOffset = next - lines[last].length
} else {
nextLine = line
nextOffset = offset
}
tokens.push([
'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
}
tokens.push([
'at-word',
css.slice(pos, next + 1),
line,
pos - offset,
line,
next - offset
])
pos = next
break
case BACKSLASH:
next = pos
escape = true
nextLine = line
while (css.charCodeAt(next + 1) === BACKSLASH) {
next += 1
escape = !escape
}
code = css.charCodeAt(next + 1)
if (escape) {
if (code === CR && css.charCodeAt(next + 2) === NEWLINE) {
next += 2
nextLine += 1
nextOffset = next
} else if (code === CR || code === NEWLINE || code === FEED) {
next += 1
nextLine += 1
nextOffset = next
} else {
next += 1
}
}
tokens.push([
'word',
css.slice(pos, next + 1),
line,
pos - offset,
line,
next - offset
])
if (nextLine !== line) {
line = nextLine
offset = nextOffset
}
pos = next
break
default:
n = css.charCodeAt(pos + 1)
if (code === SLASH && n === ASTERICK) {
next = css.indexOf('*/', pos + 2) + 1
Iif (next === 0) 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
}
tokens.push([
'comment',
content,
line,
pos - offset,
nextLine,
next - nextOffset
])
offset = nextOffset
line = nextLine
pos = next
} else if (code === SLASH && n === SLASH) {
RE_NEW_LINE.lastIndex = pos + 1
RE_NEW_LINE.test(css)
if (RE_NEW_LINE.lastIndex === 0) {
next = css.length - 1
} else {
next = RE_NEW_LINE.lastIndex - 2
}
content = css.slice(pos, next + 1)
tokens.push([
'comment',
content,
line,
pos - offset,
line,
next - offset,
'inline'
])
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
}
tokens.push([
'word',
css.slice(pos, next + 1),
line,
pos - offset,
line,
next - offset
])
pos = next
}
break
}
pos++
}
return tokens
}
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