Method parseExpression

katex/katex.js:17788–17828

* Parses an "expression", which is a list of atoms. * * `breakOnInfix`: Should the parsing stop when we hit infix nodes? This * happens when functions have higher precedence han infix * nodes in implicit parses. * * `breakOnTokenText`: The text of th

(breakOnInfix, breakOnTokenText)

   *                     expression.
   */
  parseExpression(breakOnInfix, breakOnTokenText) {
    const body = []; // Keep adding atoms to the body until we can't parse any more atoms (either
    // we reached the end, a }, or a \right)

    while (true) {
      // Ignore spaces in math mode
      if (this.mode === "math") {
        this.consumeSpaces();
      }

      const lex = this.fetch();

      if (Parser.endOfExpression.indexOf(lex.text) !== -1) {
        break;
      }

      if (breakOnTokenText && lex.text === breakOnTokenText) {
        break;
      }

      if (breakOnInfix && src_functions[lex.text] && src_functions[lex.text].infix) {
        break;
      }

      const atom = this.parseAtom(breakOnTokenText);

      if (!atom) {
        break;
      } else if (atom.type === "internal") {
        continue;
      }

      body.push(atom);
    }

    if (this.mode === "text") {
      this.formLigatures(body);
    }

    return this.handleInfixNodes(body);
  }
  /**
   * Rewrites infix operators such as \over with corresponding commands such
   * as \frac.