markdown-it/lib/rules_inline/escape.js

// Process escaped chars and hardbreaks

'use strict';

var isSpace = require('../common/utils').isSpace;

var ESCAPED = [];

for (var i = 0; i < 256; i++) { ESCAPED.push(0); }

'\\!"#$%&\'()*+,./:;<=>?@[]^_`{|}~-'
  .split('').forEach(function (ch) { ESCAPED[ch.charCodeAt(0)] = 1; });


module.exports = function escape(state, silent) {
  var ch, pos = state.pos, max = state.posMax;

  if (state.src.charCodeAt(pos) !== 0x5C/* \ */) { return false; }

  pos++;

  if (pos < max) {
    ch = state.src.charCodeAt(pos);

    if (ch < 256 && ESCAPED[ch] !== 0) {
      if (!silent) { state.pending += state.src[pos]; }
      state.pos += 2;
      return true;
    }

    if (ch === 0x0A) {
      if (!silent) {
        state.push('hardbreak', 'br', 0);
      }

      pos++;
      // skip leading whitespaces from next line
      while (pos < max) {
        ch = state.src.charCodeAt(pos);
        if (!isSpace(ch)) { break; }
        pos++;
      }

      state.pos = pos;
      return true;
    }
  }

  if (!silent) { state.pending += '\\'; }
  state.pos++;
  return true;
};