stylint/src/parse.js

A linter for stylus

'use strict';

var fs = require('fs');


/**
 * @description parses file for testing by removing extra new lines and block comments
 * @param  {string} file        [the current file being parsed]
 * @param  {number} len         [total number of files to parse]
 * @param  {number} fileNum     [the current file being parsed (# of len) ]
 * @returns test function
 */
module.exports = function parse( app, file, len, fileNum ) {
	var stripComments = /(\/\*([^*]|[\r\n]|(\*+([^*\/]|[\r\n])))*\*+\/)/gm;

	return fs.readFile(file, { encoding: 'utf8' }, function( err, data ) {
		if ( err ) { throw err; }
		var lines;

		// remove block comments / empty lines from files
		lines = data.replace(stripComments, function( match ) {
			var lines = match.split(/\r\n|\r|\n/),
				lineLen = lines.length - 1,
				output = ' ';

			if ( lineLen === 1 ) {
				return ' ';
			}
			else {

				while ( lineLen-- ) {
					output += '\n';
				}

				return output;
			}
		});

		lines = lines.split('\n');

		/**
		 * so, this function trims each line and then tests it
		 * @param  {string} [line] the line of stylus to test
		 * @return {function} run test
		 */
		lines.forEach(function( line, i ) {
			var output = line.trim();
			// line nos don't start at 0
			i++;
			return app.test( app, line, i, output, file );
		});

		// if at the last file, call the done function to output results
		if ( fileNum === len ) {
			return app.done( app );
		}
	});
}