Input CSS source.

const input = postcss.parse('a{}', { from: file }).input
input.css //=> "a{}"

The absolute path to the CSS source file defined with the from option.

const root = postcss.parse(css, { from: 'a.css' })
root.source.input.file //=> '/home/ai/a.css'

The CSS source identifier. Contains Input#file if the user set the from option, or Input#id if they did not.

const root = postcss.parse(css, { from: 'a.css' })
root.source.input.from //=> "/home/ai/a.css"

const root = postcss.parse(css)
root.source.input.from //=> "<input css 1>"

The flag to indicate whether or not the source code has Unicode BOM.

The unique ID of the CSS source. It will be created if from option is not provided (because PostCSS does not know the file path).

const root = postcss.parse(css)
root.source.input.file //=> undefined
root.source.input.id   //=> "<input css 8LZeVF>"

The input source map passed from a compilation step before PostCSS (for example, from Sass compiler).

root.source.input.map.consumer().sources //=> ['a.sass']

Converts source offset to line and column.

Reads the input source map and returns a symbol position in the input source (e.g., in a Sass file that was compiled to CSS before being passed to PostCSS). Optionally takes an end position, exclusive.

root.source.input.origin(1, 1) //=> { file: 'a.css', line: 3, column: 1 }
root.source.input.origin(1, 1, 1, 4)
//=> { file: 'a.css', line: 3, column: 1, endLine: 3, endColumn: 4 }