Press n or j to go to the next uncovered block, b, p or k for the previous block.
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module.exports = class Parser {
constructor(input) {
this.input = input
this.pos = 0
this.root = new Root()
this.current = this.root
this.spaces = ''
this.extraIndent = false
this.prevIndent = undefined
this.step = undefined
this.root.source = { input, start: { line: 1, column: 1 } }
}
loop() {
let part
while (this.pos < this.parts.length) {
part = this.parts[this.pos]
if (part.comment) {
this.comment(part)
} else if (part.atrule) {
this.atrule(part)
} else if (part.colon) {
let next = this.nextNonComment(this.pos)
if (next.end || next.atrule) {
this.decl(part)
} else {
let moreIndent = next.indent.length > part.indent.length
if (!moreIndent) {
this.decl(part)
} else if (moreIndent && next.colon) {
this.rule(part)
} else Eif (moreIndent && !next.colon) {
this.decl(part)
}
}
} else if (part.end) {
this.root.raws.after = part.before
} else {
this.rule(part)
}
this.pos += 1
}
for (let i = this.tokens.length - 1; i >= 0; i--) {
if (this.tokens[i].length > 3) {
let last = this.tokens[i]
this.root.source.end = {
line: last[4] || last[2],
column: last[5] || last[3]
}
break
}
}
}
comment(part) {
let token = part.tokens[0]
let node = new Comment()
this.init(node, part)
node.source.end = { line: token[4], column: token[5] }
this.commentText(node, token)
}
atrule(part) {
let atword = part.tokens[0]
let params = part.tokens.slice(1)
let node = new AtRule()
node.name = atword[1].slice(1)
this.init(node, part)
Iif (node.name === '') this.unnamedAtrule(atword)
while (!part.end && part.lastComma) {
this.pos += 1
part = this.parts[this.pos]
params.push(['space', part.before + part.indent])
params = params.concat(part.tokens)
}
node.raws.afterName = this.firstSpaces(params)
this.keepTrailingSpace(node, params)
this.checkSemicolon(params)
this.checkCurly(params)
this.raw(node, 'params', params, atword)
}
decl(part) {
let node = new Declaration()
this.init(node, part)
let between = ''
let colon = 0
let value = []
let prop = ''
for (let i = 0; i < part.tokens.length; i++) {
let token = part.tokens[i]
if (token[0] === ':') {
between += token[1]
colon = token
value = part.tokens.slice(i + 1)
break
} else if (token[0] === 'comment' || token[0] === 'space') {
between += token[1]
} else if (between !== '') {
this.badProp(token)
} else {
prop += token[1]
}
}
if (prop === '') this.unnamedDecl(part.tokens[0])
node.prop = prop
let next = this.parts[this.pos + 1]
while (
!next.end &&
!next.atrule &&
!next.colon &&
next.indent.length > part.indent.length
) {
value.push(['space', next.before + next.indent])
value = value.concat(next.tokens)
this.pos += 1
next = this.parts[this.pos + 1]
}
let last = value[value.length - 1]
if (last && last[0] === 'comment') {
value.pop()
let comment = new Comment()
this.current.push(comment)
comment.source = {
input: this.input,
start: { line: last[2], column: last[3] },
end: { line: last[4], column: last[5] }
}
let prev = value[value.length - 1]
Eif (prev && prev[0] === 'space') {
value.pop()
comment.raws.before = prev[1]
}
this.commentText(comment, last)
}
for (let i = value.length - 1; i > 0; i--) {
let t = value[i][0]
if (t === 'word' && value[i][1] === '!important') {
node.important = true
if (i > 0 && value[i - 1][0] === 'space') {
node.raws.important = value[i - 1][1] + '!important'
value.splice(i - 1, 2)
} else {
node.raws.important = '!important'
value.splice(i, 1)
}
break
} else if (t !== 'space' && t !== 'newline' && t !== 'comment') {
break
}
}
node.raws.between = between + this.firstSpaces(value)
this.checkSemicolon(value)
this.raw(node, 'value', value, colon)
}
rule(part) {
let node = new Rule()
this.init(node, part)
let selector = part.tokens
let next = this.parts[this.pos + 1]
while (!next.end && next.indent.length === part.indent.length) {
selector.push(['space', next.before + next.indent])
selector = selector.concat(next.tokens)
this.pos += 1
next = this.parts[this.pos + 1]
}
this.keepTrailingSpace(node, selector)
this.checkCurly(selector)
this.raw(node, 'selector', selector)
}
/* Helpers */
indent(part) {
let indent = part.indent.length
let isPrev = typeof this.prevIndent !== 'undefined'
if (!isPrev && indent) this.indentedFirstLine(part)
if (!this.step && indent) {
this.step = indent
this.root.raws.indent = part.indent
}
if (isPrev && this.prevIndent !== indent) {
let diff = indent - this.prevIndent
if (diff > 0) {
if (diff !== this.step) {
this.wrongIndent(this.prevIndent + this.step, indent, part)
} else if (this.current.last.push) {
this.current = this.current.last
} else {
this.extraIndent = ''
for (let i = 0; i < diff; i++) {
this.extraIndent += ' '
}
}
} else if (diff % this.step !== 0) {
let m = indent + (diff % this.step)
this.wrongIndent(`${m} or ${m + this.step}`, indent, part)
} else {
for (let i = 0; i < -diff / this.step; i++) {
this.current = this.current.parent
}
}
}
this.prevIndent = indent
}
init(node, part) {
this.indent(part)
if (!this.current.nodes) this.current.nodes = []
this.current.push(node)
node.raws.before = part.before + part.indent
if (this.extraIndent) {
node.raws.extraIndent = this.extraIndent
this.extraIndent = false
}
node.source = {
start: { line: part.tokens[0][2], column: part.tokens[0][3] },
input: this.input
}
}
checkCurly(tokens) {
for (let token of tokens) {
if (token[0] === '{') {
this.error('Unnecessary curly bracket', token[2], token[3])
}
}
}
checkSemicolon(tokens) {
for (let token of tokens) {
if (token[0] === ';') {
this.error('Unnecessary semicolon', token[2], token[3])
}
}
}
keepTrailingSpace(node, tokens) {
let lastSpace = tokens[tokens.length - 1]
if (lastSpace && lastSpace[0] === 'space') {
tokens.pop()
node.raws.sssBetween = lastSpace[1]
}
}
firstSpaces(tokens) {
let result = ''
for (let i = 0; i < tokens.length; i++) {
if (tokens[i][0] === 'space' || tokens[i][0] === 'newline') {
result += tokens.shift()[1]
i -= 1
} else {
break
}
}
return result
}
raw(node, prop, tokens, altLast) {
let token, type
let length = tokens.length
let value = ''
let clean = true
for (let i = 0; i < length; i += 1) {
token = tokens[i]
type = token[0]
if (type === 'comment' || (type === 'space' && i === length - 1)) {
clean = false
} else {
value += token[1]
}
}
if (!clean) {
let sss = tokens.reduce((all, i) => all + i[1], '')
let raw = tokens.reduce((all, i) => {
if (i[0] === 'comment' && i[6] === 'inline') {
return all + '/* ' + i[1].slice(2).trim() + ' */'
} else {
return all + i[1]
}
}, '')
node.raws[prop] = { value, raw }
if (sss !== raw) node.raws[prop].sss = sss
}
node[prop] = value
let last
for (let i = tokens.length - 1; i >= 0; i--) {
if (tokens[i].length > 2) {
last = tokens[i]
break
}
}
if (!last) last = altLast
node.source.end = {
line: last[4] || last[2],
column: last[5] || last[3]
}
}
nextNonComment(pos) {
let next = pos
let part
while (next < this.parts.length) {
next += 1
part = this.parts[next]
if (part.end || !part.comment) break
}
return part
}
commentText(node, token) {
let text = token[1]
if (token[6] === 'inline') {
node.raws.inline = true
text = text.slice(2)
} else {
text = text.slice(2, -2)
}
let match = text.match(/^(\s*)([^]*\S)(\s*)\n?$/)
if (match) {
node.text = match[2]
node.raws.left = match[1]
node.raws.inlineRight = match[3]
} else {
node.text = ''
node.raws.left = ''
node.raws.inlineRight = ''
}
}
// Errors
error(msg, line, column) {
throw this.input.error(msg, line, column)
}
unnamedAtrule(token) {
this.error('At-rule without name', token[2], token[3])
}
unnamedDecl(token) {
this.error('Declaration without name', token[2], token[3])
}
indentedFirstLine(part) {
this.error('First line should not have indent', part.number, 1)
}
wrongIndent(expected, real, part) {
let msg = `Expected ${expected} indent, but get ${real}`
this.error(msg, part.number, 1)
}
badProp(token) {
this.error('Unexpected separator in property', token[2], token[3])
}
}
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