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* @license Apache-2.0
*
* Copyright (c) 2019 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var replace = require( '@stdlib/string/base/replace' );
var style2ansi = require( './style_to_ansi.js' );
var escapeCode = require( './ansi_escape_code.js' );
// VARIABLES //
var RESET = escapeCode( 'RESET' );
// MAIN //
/**
* Applies ANSI styling to a line of slide text.
*
* ## Notes
*
* - The input line object is mutated.
*
* @private
* @param {Object} line - line
* @returns {Object} styled line
*/
function ansiStyle( line ) {
var RE_ANSI_ESCAPE;
var reset;
var len;
// Create a regular expression for matching escaped characters:
RE_ANSI_ESCAPE = /(\\.)/g;
// Initialize a length adjustment factor:
len = 0;
// If we encounter ANSI style indicators, we need to "close" the ANSI escape sequence:
reset = '';
// Replace ANSI style indicators with their corresponding escape sequences:
line.text = replace( line.text, RE_ANSI_ESCAPE, replacer );
// If we applied ANSI styling, close the ANSI escape sequence:
line.text += reset;
// Update the effective line length:
line.length += len;
// Return the styled line:
return line;
/**
* Callback invoked for each match.
*
* @private
* @param {string} match - matched substring
* @param {string} p1 - first string found by a parenthesized capture group
* @returns {string} replacement string
*/
function replacer( match, p1 ) {
var ch = p1[ 1 ];
var c;
c = style2ansi( ch );
if ( c ) {
reset = RESET;
len -= 2;
return c;
}
if ( ch === 's' ) {
len -= 2;
return RESET;
}
if ( ch === '\\' ) {
len -= 1;
return '\\\\';
}
return '\\\\' + ch;
}
}
// EXPORTS //
module.exports = ansiStyle;
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