Function parseSymbol

src/expression/parse.js:1382–1405

* parse symbols: functions, variables, constants, units * @return {Node} node * @private

(state)

   * @private
   */
  function parseSymbol (state) {
    let node, name

    if (state.tokenType === TOKENTYPE.SYMBOL ||
        (state.tokenType === TOKENTYPE.DELIMITER && state.token in NAMED_DELIMITERS)) {
      name = state.token

      getToken(state)

      if (hasOwnProperty(CONSTANTS, name)) { // true, false, null, ...
        node = new ConstantNode(CONSTANTS[name])
      } else if (NUMERIC_CONSTANTS.includes(name)) { // NaN, Infinity
        node = new ConstantNode(numeric(name, 'number'))
      } else {
        node = new SymbolNode(name)
      }

      // parse function parameters and matrix index
      node = parseAccessors(state, node)
      return node
    }

    return parseString(state)
  }

  /**
   * parse accessors: