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<h1 class="page-title">css-syntax-error.es6</h1>
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<pre class="prettyprint source linenums"><code>import supportsColor from 'supports-color'
import chalk from 'chalk'
import terminalHighlight from './terminal-highlight'
/**
* The CSS parser throws this error for broken CSS.
*
* Custom parsers can throw this error for broken custom syntax using
* the {@link Node#error} method.
*
* PostCSS will use the input source map to detect the original error location.
* If you wrote a Sass file, compiled it to CSS and then parsed it with PostCSS,
* PostCSS will show the original position in the Sass file.
*
* If you need the position in the PostCSS input
* (e.g., to debug the previous compiler), use `error.input.file`.
*
* @example
* // Catching and checking syntax error
* try {
* postcss.parse('a{')
* } catch (error) {
* if (error.name === 'CssSyntaxError') {
* error //=> CssSyntaxError
* }
* }
*
* @example
* // Raising error from plugin
* throw node.error('Unknown variable', { plugin: 'postcss-vars' })
*/
class CssSyntaxError {
/**
* @param {string} message Error message.
* @param {number} [line] Source line of the error.
* @param {number} [column] Source column of the error.
* @param {string} [source] Source code of the broken file.
* @param {string} [file] Absolute path to the broken file.
* @param {string} [plugin] PostCSS plugin name, if error came from plugin.
*/
constructor (message, line, column, source, file, plugin) {
/**
* Always equal to `'CssSyntaxError'`. You should always check error type
* by `error.name === 'CssSyntaxError'`
* instead of `error instanceof CssSyntaxError`,
* because npm could have several PostCSS versions.
*
* @type {string}
*
* @example
* if (error.name === 'CssSyntaxError') {
* error //=> CssSyntaxError
* }
*/
this.name = 'CssSyntaxError'
/**
* Error message.
*
* @type {string}
*
* @example
* error.message //=> 'Unclosed block'
*/
this.reason = message
if (file) {
/**
* Absolute path to the broken file.
*
* @type {string}
*
* @example
* error.file //=> 'a.sass'
* error.input.file //=> 'a.css'
*/
this.file = file
}
if (source) {
/**
* Source code of the broken file.
*
* @type {string}
*
* @example
* error.source //=> 'a { b {} }'
* error.input.column //=> 'a b { }'
*/
this.source = source
}
if (plugin) {
/**
* Plugin name, if error came from plugin.
*
* @type {string}
*
* @example
* error.plugin //=> 'postcss-vars'
*/
this.plugin = plugin
}
if (typeof line !== 'undefined' &amp;&amp; typeof column !== 'undefined') {
/**
* Source line of the error.
*
* @type {number}
*
* @example
* error.line //=> 2
* error.input.line //=> 4
*/
this.line = line
/**
* Source column of the error.
*
* @type {number}
*
* @example
* error.column //=> 1
* error.input.column //=> 4
*/
this.column = column
}
this.setMessage()
if (Error.captureStackTrace) {
Error.captureStackTrace(this, CssSyntaxError)
}
}
setMessage () {
/**
* Full error text in the GNU error format
* with plugin, file, line and column.
*
* @type {string}
*
* @example
* error.message //=> 'a.css:1:1: Unclosed block'
*/
this.message = this.plugin ? this.plugin + ': ' : ''
this.message += this.file ? this.file : '&lt;css input>'
if (typeof this.line !== 'undefined') {
this.message += ':' + this.line + ':' + this.column
}
this.message += ': ' + this.reason
}
/**
* Returns a few lines of CSS source that caused the error.
*
* If the CSS has an input source map without `sourceContent`,
* this method will return an empty string.
*
* @param {boolean} [color] Whether arrow will be colored red by terminal
* color codes. By default, PostCSS will detect
* color support by `process.stdout.isTTY`
* and `process.env.NODE_DISABLE_COLORS`.
*
* @example
* error.showSourceCode() //=> " 4 | }
* // 5 | a {
* // > 6 | bad
* // | ^
* // 7 | }
* // 8 | b {"
*
* @return {string} Few lines of CSS source that caused the error.
*/
showSourceCode (color) {
if (!this.source) return ''
let css = this.source
if (terminalHighlight) {
if (typeof color === 'undefined') color = supportsColor.stdout
if (color) css = terminalHighlight(css)
}
const lines = css.split(/\r?\n/)
const start = Math.max(this.line - 3, 0)
const end = Math.min(this.line + 2, lines.length)
const maxWidth = String(end).length
function mark (text) {
if (color &amp;&amp; chalk.red) {
return chalk.red.bold(text)
} else {
return text
}
}
function aside (text) {
if (color &amp;&amp; chalk.gray) {
return chalk.gray(text)
} else {
return text
}
}
return lines.slice(start, end).map((line, index) => {
const number = start + 1 + index
const gutter = ' ' + (' ' + number).slice(-maxWidth) + ' | '
if (number === this.line) {
const spacing = aside(gutter.replace(/\d/g, ' ')) +
line.slice(0, this.column - 1).replace(/[^\t]/g, ' ')
return mark('>') + aside(gutter) + line + '\n ' + spacing + mark('^')
} else {
return ' ' + aside(gutter) + line
}
}).join('\n')
}
/**
* Returns error position, message and source code of the broken part.
*
* @example
* error.toString() //=> "CssSyntaxError: app.css:1:1: Unclosed block
* // > 1 | a {
* // | ^"
*
* @return {string} Error position, message and source code.
*/
toString () {
let code = this.showSourceCode()
if (code) {
code = '\n\n' + code + '\n'
}
return this.name + ': ' + this.message + code
}
/**
* @memberof CssSyntaxError#
* @member {Input} input Input object with PostCSS internal information
* about input file. If input has source map
* from previous tool, PostCSS will use origin
* (for example, Sass) source. You can use this
* object to get PostCSS input source.
*
* @example
* error.input.file //=> 'a.css'
* error.file //=> 'a.sass'
*/
}
export default CssSyntaxError
</code></pre>
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