markdown-it/lib/rules_inline/state_inline.js

// Inline parser state

'use strict';


var Token = require('../token');

function StateInline(src, md, env, outTokens) {
  this.src = src;
  this.env = env;
  this.md = md;
  this.tokens = outTokens;

  this.pos = 0;
  this.posMax = this.src.length;
  this.level = 0;
  this.pending = '';
  this.pendingLevel = 0;

  this.cache = [];        // Stores { start: end } pairs. Useful for backtrack
                          // optimization of pairs parse (emphasis, strikes).
}


// Flush pending text
//
StateInline.prototype.pushPending = function () {
  var token = new Token('text', '', 0);
  token.content = this.pending;
  token.level = this.pendingLevel;
  this.tokens.push(token);
  this.pending = '';
  return token;
};


// Push new token to "stream".
// If pending text exists - flush it as text token
//
StateInline.prototype.push = function (type, tag, nesting) {
  if (this.pending) {
    this.pushPending();
  }

  var token = new Token(type, tag, nesting);

  if (nesting < 0) { this.level--; }
  token.level = this.level;
  if (nesting > 0) { this.level++; }

  this.pendingLevel = this.level;
  this.tokens.push(token);
  return token;
};


// Store value to cache.
// !!! Implementation has parser-specific optimizations
// !!! keys MUST be integer, >= 0; values MUST be integer, > 0
//
StateInline.prototype.cacheSet = function (key, val) {
  for (var i = this.cache.length; i <= key; i++) {
    this.cache.push(0);
  }

  this.cache[key] = val;
};


// Get cache value
//
StateInline.prototype.cacheGet = function (key) {
  return key < this.cache.length ? this.cache[key] : 0;
};


module.exports = StateInline;