(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('katex')) :
  typeof define === 'function' && define.amd ? define(['katex'], factory) :
  (global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.markedKatex = factory(global.katex));
})(this, (function (katex) { 'use strict';

  const inlineRule = /^(\${1,2})(?!\$)((?:\\.|[^\\\n])*?(?:\\.|[^\\\n\$]))\1(?=[\s?!\.,:？！。，：]|$)/;
  const inlineRuleNonStandard = /^(\${1,2})(?!\$)((?:\\.|[^\\\n])*?(?:\\.|[^\\\n\$]))\1/; // Non-standard, even if there are no spaces before and after $ or $$, try to parse

  const blockRule = /^(\${1,2})\n((?:\\[^]|[^\\])+?)\n\1(?:\n|$)/;

  function index(options = {}) {
    return {
      extensions: [
        inlineKatex(options, createRenderer(options, false)),
        blockKatex(options, createRenderer(options, true)),
      ],
    };
  }

  function createRenderer(options, newlineAfter) {
    return (token) => katex.renderToString(token.text, { ...options, displayMode: token.displayMode }) + (newlineAfter ? '\n' : '');
  }

  function inlineKatex(options, renderer) {
    const nonStandard = options && options.nonStandard;
    const ruleReg = nonStandard ? inlineRuleNonStandard : inlineRule;
    return {
      name: 'inlineKatex',
      level: 'inline',
      start(src) {
        let index;
        let indexSrc = src;

        while (indexSrc) {
          index = indexSrc.indexOf('$');
          if (index === -1) {
            return;
          }
          const f = nonStandard ? index > -1 : index === 0 || indexSrc.charAt(index - 1) === ' ';
          if (f) {
            const possibleKatex = indexSrc.substring(index);

            if (possibleKatex.match(ruleReg)) {
              return index;
            }
          }

          indexSrc = indexSrc.substring(index + 1).replace(/^\$+/, '');
        }
      },
      tokenizer(src, tokens) {
        const match = src.match(ruleReg);
        if (match) {
          return {
            type: 'inlineKatex',
            raw: match[0],
            text: match[2].trim(),
            displayMode: match[1].length === 2,
          };
        }
      },
      renderer,
    };
  }

  function blockKatex(options, renderer) {
    return {
      name: 'blockKatex',
      level: 'block',
      tokenizer(src, tokens) {
        const match = src.match(blockRule);
        if (match) {
          return {
            type: 'blockKatex',
            raw: match[0],
            text: match[2].trim(),
            displayMode: match[1].length === 2,
          };
        }
      },
      renderer,
    };
  }

  return index;

}));