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/*
* c-transpiler.js - transpile C to JS while retaining line numbers.
*
* Copyright (C) 2023 Jo-Philipp Wich <jo@mein.io>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
'use strict';
function isCommentStart(source, offset) {
if (source[offset++] != '\n')
return false;
while (source[offset] == ' ' || source[offset] == '\t')
offset++;
return (
source[offset++] == '/' &&
source[offset++] == '*' &&
source[offset++] == '*'
);
}
exports.handlers = {
beforeParse: function(e) {
if (!e.filename.match(/\.(c|h)$/))
return;
let chunks = [ { start: 0, end: -1, comment: false } ];
let chunk = chunks[0];
let i = 0;
for (i = 0; i < e.source.length; i++) {
if (!chunk.comment && isCommentStart(e.source, i)) {
chunk.end = i;
chunk = { start: i, end: -1, comment: true };
chunks.push(chunk);
i += 3;
}
else if (chunk.comment && e.source[i] == '*' && e.source[i+1] == '/') {
chunk.end = i + 1;
chunk = { start: i + 1, end: -1, comment: false };
chunks.push(chunk);
i += 1;
}
}
chunk.end = i;
let source = '';
for (chunk of chunks) {
if (chunk.comment)
source += e.source.substring(chunk.start, chunk.end);
else
source += e.source.substring(chunk.start, chunk.end).replace(/(^|\n)/g, '$1//');
}
e.source = source;
}
};
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