Function preprocessComments

src/preprocessor/preprocessor.ts:70–122

(src: string)

// From glsl2s https://github.com/cimaron/glsl2js/blob/4046611ac4f129a9985d74704159c41a402564d0/preprocessor/comments.js
const preprocessComments = (src: string): string => {
  let i;
  let chr;
  let la;
  let out = '';
  let line = 1;
  let in_single = 0;
  let in_multi = 0;

  for (i = 0; i < src.length; i++) {
    chr = src.substring(i, i + 1);
    la = src.substring(i + 1, i + 2);

    // Enter single line comment
    if (chr == '/' && la == '/' && !in_single && !in_multi) {
      in_single = line;
      i++;
      continue;
    }

    // Exit single line comment
    if (chr == '\n' && in_single) {
      in_single = 0;
    }

    // Enter multi line comment
    if (chr == '/' && la == '*' && !in_multi && !in_single) {
      in_multi = line;
      i++;
      continue;
    }

    // Exit multi line comment
    if (chr == '*' && la == '/' && in_multi) {
      // Treat single line multi-comment as space
      if (in_multi == line) {
        out += ' ';
      }

      in_multi = 0;
      i++;
      continue;
    }

    // Newlines are preserved
    if ((!in_multi && !in_single) || chr == '\n') {
      out += chr;
      line++;
    }
  }

  return out;
};

const tokenPaste = (str: string): string => str.replace(/\s+##\s+/g, '');