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input.js
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Fri, Feb 14, 08:46

input.js
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'use strict'
let { SourceMapConsumer, SourceMapGenerator } = require('source-map-js')
let { fileURLToPath, pathToFileURL } = require('url')
let { resolve, isAbsolute } = require('path')
let { nanoid } = require('nanoid/non-secure')
let terminalHighlight = require('./terminal-highlight')
let CssSyntaxError = require('./css-syntax-error')
let PreviousMap = require('./previous-map')
let fromOffsetCache = Symbol('fromOffsetCache')
let sourceMapAvailable = Boolean(SourceMapConsumer && SourceMapGenerator)
let pathAvailable = Boolean(resolve && isAbsolute)
class Input {
constructor(css, opts = {}) {
if (
css === null ||
typeof css === 'undefined' ||
(typeof css === 'object' && !css.toString)
) {
throw new Error(`PostCSS received ${css} instead of CSS string`)
}
this.css = css.toString()
if (this.css[0] === '\uFEFF' || this.css[0] === '\uFFFE') {
this.hasBOM = true
this.css = this.css.slice(1)
} else {
this.hasBOM = false
}
if (opts.from) {
if (
!pathAvailable ||
/^\w+:\/\//.test(opts.from) ||
isAbsolute(opts.from)
) {
this.file = opts.from
} else {
this.file = resolve(opts.from)
}
}
if (pathAvailable && sourceMapAvailable) {
let map = new PreviousMap(this.css, opts)
if (map.text) {
this.map = map
let file = map.consumer().file
if (!this.file && file) this.file = this.mapResolve(file)
}
}
if (!this.file) {
this.id = '<input css ' + nanoid(6) + '>'
}
if (this.map) this.map.file = this.from
}
fromOffset(offset) {
let lastLine, lineToIndex
if (!this[fromOffsetCache]) {
let lines = this.css.split('\n')
lineToIndex = new Array(lines.length)
let prevIndex = 0
for (let i = 0, l = lines.length; i < l; i++) {
lineToIndex[i] = prevIndex
prevIndex += lines[i].length + 1
}
this[fromOffsetCache] = lineToIndex
} else {
lineToIndex = this[fromOffsetCache]
}
lastLine = lineToIndex[lineToIndex.length - 1]
let min = 0
if (offset >= lastLine) {
min = lineToIndex.length - 1
} else {
let max = lineToIndex.length - 2
let mid
while (min < max) {
mid = min + ((max - min) >> 1)
if (offset < lineToIndex[mid]) {
max = mid - 1
} else if (offset >= lineToIndex[mid + 1]) {
min = mid + 1
} else {
min = mid
break
}
}
}
return {
line: min + 1,
col: offset - lineToIndex[min] + 1
}
}
error(message, line, column, opts = {}) {
let result, endLine, endColumn
if (line && typeof line === 'object') {
let start = line
let end = column
if (typeof start.offset === 'number') {
let pos = this.fromOffset(start.offset)
line = pos.line
column = pos.col
} else {
line = start.line
column = start.column
}
if (typeof end.offset === 'number') {
let pos = this.fromOffset(end.offset)
endLine = pos.line
endColumn = pos.col
} else {
endLine = end.line
endColumn = end.column
}
} else if (!column) {
let pos = this.fromOffset(line)
line = pos.line
column = pos.col
}
let origin = this.origin(line, column, endLine, endColumn)
if (origin) {
result = new CssSyntaxError(
message,
origin.endLine === undefined
? origin.line
: { line: origin.line, column: origin.column },
origin.endLine === undefined
? origin.column
: { line: origin.endLine, column: origin.endColumn },
origin.source,
origin.file,
opts.plugin
)
} else {
result = new CssSyntaxError(
message,
endLine === undefined ? line : { line, column },
endLine === undefined ? column : { line: endLine, column: endColumn },
this.css,
this.file,
opts.plugin
)
}
result.input = { line, column, endLine, endColumn, source: this.css }
if (this.file) {
if (pathToFileURL) {
result.input.url = pathToFileURL(this.file).toString()
}
result.input.file = this.file
}
return result
}
origin(line, column, endLine, endColumn) {
if (!this.map) return false
let consumer = this.map.consumer()
let from = consumer.originalPositionFor({ line, column })
if (!from.source) return false
let to
if (typeof endLine === 'number') {
to = consumer.originalPositionFor({ line: endLine, column: endColumn })
}
let fromUrl
if (isAbsolute(from.source)) {
fromUrl = pathToFileURL(from.source)
} else {
fromUrl = new URL(
from.source,
this.map.consumer().sourceRoot || pathToFileURL(this.map.mapFile)
)
}
let result = {
url: fromUrl.toString(),
line: from.line,
column: from.column,
endLine: to && to.line,
endColumn: to && to.column
}
if (fromUrl.protocol === 'file:') {
if (fileURLToPath) {
result.file = fileURLToPath(fromUrl)
} else {
/* c8 ignore next 2 */
throw new Error(`file: protocol is not available in this PostCSS build`)
}
}
let source = consumer.sourceContentFor(from.source)
if (source) result.source = source
return result
}
mapResolve(file) {
if (/^\w+:\/\//.test(file)) {
return file
}
return resolve(this.map.consumer().sourceRoot || this.map.root || '.', file)
}
get from() {
return this.file || this.id
}
toJSON() {
let json = {}
for (let name of ['hasBOM', 'css', 'file', 'id']) {
if (this[name] != null) {
json[name] = this[name]
}
}
if (this.map) {
json.map = { ...this.map }
if (json.map.consumerCache) {
json.map.consumerCache = undefined
}
}
return json
}
}
module.exports = Input
Input.default = Input
if (terminalHighlight && terminalHighlight.registerInput) {
terminalHighlight.registerInput(Input)
}

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