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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 reEOL = require( '@stdlib/regexp/eol' );
var trim = require( '@stdlib/string/trim' );
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
var max = require( '@stdlib/math/base/special/max' );
var style = require( './style_line.js' );
var emoji = require( './emoji.js' );
// VARIABLES //
var FRAGMENT_SEP = '--';
var NOTES_SEP = '~~~';
var RE_CODE_DELIMITER = /^(\s*)```\s*([a-z]+)?$/;
var CODE_INDENTATION = ' ';
// Hash for normalizing code block languages:
var LANGS = {
'js': 'javascript',
'javascript': 'javascript'
};
// MAIN //
/**
* Parses raw slide text.
*
* @private
* @param {string} text - raw slide text
* @returns {Object} slide object
*/
function parseSlide( text ) {
var CODE_BLOCK_INDENTATION;
var CODE_BLOCK;
var lines;
var frags;
var line;
var lang;
var out;
var f;
var m;
var j;
var k;
out = {
'raw': text,
'fragments': [],
'code': [],
'notes': '',
'length': 0, // number of lines
'maxLength': 0 // maximum line length
};
// Extract speaker notes (if any)...
text = text.split( NOTES_SEP );
if ( text.length > 1 ) {
out.notes += trim( text.slice( 1 ).join( NOTES_SEP ) );
}
text = text[ 0 ];
// Process slide fragments...
frags = text.split( FRAGMENT_SEP );
for ( j = 0; j < frags.length; j++ ) {
lines = trim( frags[ j ] ).split( reEOL.REGEXP );
if ( j === 0 ) {
f = [];
} else {
f = out.fragments[ j-1 ].slice();
}
CODE_BLOCK = false;
for ( k = 0; k < lines.length; k++) {
line = lines[ k ];
// Handle code blocks...
m = line.match( RE_CODE_DELIMITER );
if ( m ) {
if ( CODE_BLOCK === false ) {
// Starting code delimiter:
CODE_BLOCK = true;
CODE_BLOCK_INDENTATION = m[ 1 ];
// Determine the code block language...
if ( m[ 2 ] ) {
if ( hasOwnProp( LANGS, m[ 2 ] ) ) { // eslint-disable-line max-depth
lang = LANGS[ m[ 2 ] ];
} else {
lang = 'unknown';
}
} else {
// By default, we assume JavaScript is the code block language:
lang = 'javascript';
}
out.code.push({
'lang': lang,
'src': []
});
} else {
// Ending code delimiter:
CODE_BLOCK = false;
}
continue;
}
if ( CODE_BLOCK ) {
line = line.slice( CODE_BLOCK_INDENTATION.length );
out.code[ out.code.length-1 ].src.push( line );
line = CODE_INDENTATION + line;
// TODO: apply syntax highlighting
}
// Create a line object for tracking a line's effective length:
line = {
'text': line,
'length': line.length
};
// Apply styling:
line = style( line );
// Apply emojis:
line = emoji( line );
// Append the line to the fragment:
f.push( line );
}
// A fragment includes the slide text of all prior fragments:
out.fragments.push( f );
}
out.length = f.length;
// Determine the maximum slide text line length...
for ( j = 0; j < f.length; j++ ) {
out.maxLength = max( out.maxLength, f[ j ].length );
}
return out;
}
// EXPORTS //
module.exports = parseSlide;
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