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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 hasOwnProp = require( '@stdlib/assert/has-own-property' );
var table = require( '@stdlib/datasets/emoji-code-picto' );
// VARIABLES //
var TABLE = table();
// MAIN //
/**
* Replaces emoji codes with rendered emoji in a line of slide text.
*
* ## Notes
*
* - The input line object is mutated.
*
* @private
* @param {Object} line - line
* @returns {Object} rendered line
*/
function emoji( line ) {
var RE_EMOJI_CODE;
var len;
// Create a regular expression for matching emoji codes (code schema: `:<short_name>[::<modifier>[, <modifier>[, ...]]]`):
RE_EMOJI_CODE = /:([\w+\-]+)(?::{2}([\w+\-,\s]+))?:/g; // eslint-disable-line no-useless-escape
// Initialize a length adjustment factor:
len = 0;
// Replace emoji codes with rendered emojis:
line.text = replace( line.text, RE_EMOJI_CODE, replacer );
// Update the effective line length:
line.length += len;
// Return the rendered 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
* @param {(string|void)} p2 - second string found by a parenthesized capture group
* @returns {string} replacement string
*/
function replacer( match, p1, p2 ) {
var code;
var out;
// Reconstitute the emoji code in order to normalize the code string:
code = ':' + p1 + ':';
if ( p2 ) {
p2 = p2.split( /,\s*/ ).join( ', ' ); // normalize any modifiers by ensuring consistent modifier spacing
code += ':' + p2 + ':';
}
if ( hasOwnProp( TABLE, code ) ) {
out = TABLE[ code ];
// Note: we limit ourselves to emojis that are two columns wide--emoji being considered wide characters--hence, minus two. Depending on Unicode support, other emoji may not render as a single glyph.
if ( out.length === 2 ) {
len -= match.length - 2;
return out;
}
}
// If unable to convert an emoji code to a rendered emoji, return the matched substring unchanged:
return match;
}
}
// EXPORTS //
module.exports = emoji;
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