markdown-it/lib/rules_block/lheading.js

// lheading (---, ===)

'use strict';


module.exports = function lheading(state, startLine, endLine/*, silent*/) {
  var marker, pos, max, token, level,
      next = startLine + 1;

  if (next >= endLine) { return false; }
  if (state.sCount[next] < state.blkIndent) { return false; }

  // Scan next line

  if (state.sCount[next] - state.blkIndent > 3) { return false; }

  pos = state.bMarks[next] + state.tShift[next];
  max = state.eMarks[next];

  if (pos >= max) { return false; }

  marker = state.src.charCodeAt(pos);

  if (marker !== 0x2D/* - */ && marker !== 0x3D/* = */) { return false; }

  pos = state.skipChars(pos, marker);

  pos = state.skipSpaces(pos);

  if (pos < max) { return false; }

  pos = state.bMarks[startLine] + state.tShift[startLine];

  state.line = next + 1;
  level = (marker === 0x3D/* = */ ? 1 : 2);

  token          = state.push('heading_open', 'h' + String(level), 1);
  token.markup   = String.fromCharCode(marker);
  token.map      = [ startLine, state.line ];

  token          = state.push('inline', '', 0);
  token.content  = state.src.slice(pos, state.eMarks[startLine]).trim();
  token.map      = [ startLine, state.line - 1 ];
  token.children = [];

  token          = state.push('heading_close', 'h' + String(level), -1);
  token.markup   = String.fromCharCode(marker);

  return true;
};