markdown-it/lib/rules_inline/state_inline.js

// Inline parser state

'use strict';


function StateInline(src, parserInline, options, env, outTokens) {
  this.src = src;
  this.env = env;
  this.options = options;
  this.parser = parserInline;
  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).

  // Link parser state vars

  this.linkContent = '';  // Temporary storage for link url

  this.labelUnmatchedScopes = 0; // Track unpaired `[` for link labels
                                 // (backtrack optimization)
}


// Flush pending text
//
StateInline.prototype.pushPending = function () {
  this.tokens.push({
    type: 'text',
    content: this.pending,
    level: this.pendingLevel
  });
  this.pending = '';
};


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

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


// 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;