mozjexl/lib/grammar.js

/*
 * Jexl
 * Copyright (c) 2015 TechnologyAdvice
 */

/**
 * A map of all expression elements to their properties. Note that changes
 * here may require changes in the Lexer or Parser.
 * @type {{}}
 */
exports.elements = {
  ".": { type: "dot" },
  "[": { type: "openBracket" },
  "]": { type: "closeBracket" },
  "|": { type: "pipe" },
  "{": { type: "openCurl" },
  "}": { type: "closeCurl" },
  ":": { type: "colon" },
  ",": { type: "comma" },
  "(": { type: "openParen" },
  ")": { type: "closeParen" },
  "?": { type: "question" },
  "+": {
    type: "binaryOp",
    precedence: 30,
    eval: function(left, right) {
      return left + right;
    }
  },
  "-": {
    type: "binaryOp",
    precedence: 30,
    eval: function(left, right) {
      return left - right;
    }
  },
  "*": {
    type: "binaryOp",
    precedence: 40,
    eval: function(left, right) {
      return left * right;
    }
  },
  "/": {
    type: "binaryOp",
    precedence: 40,
    eval: function(left, right) {
      return left / right;
    }
  },
  "//": {
    type: "binaryOp",
    precedence: 40,
    eval: function(left, right) {
      return Math.floor(left / right);
    }
  },
  "%": {
    type: "binaryOp",
    precedence: 50,
    eval: function(left, right) {
      return left % right;
    }
  },
  "^": {
    type: "binaryOp",
    precedence: 50,
    eval: function(left, right) {
      return Math.pow(left, right);
    }
  },
  "==": {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      return left == right;
    }
  },
  "!=": {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      return left != right;
    }
  },
  ">": {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      return left > right;
    }
  },
  ">=": {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      return left >= right;
    }
  },
  "<": {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      return left < right;
    }
  },
  "<=": {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      return left <= right;
    }
  },
  "&&": {
    type: "binaryOp",
    precedence: 10,
    eval: function(left, right) {
      return left && right;
    }
  },
  "||": {
    type: "binaryOp",
    precedence: 10,
    eval: function(left, right) {
      return left || right;
    }
  },
  in: {
    type: "binaryOp",
    precedence: 20,
    eval: function(left, right) {
      if (typeof right === "string") return right.indexOf(left) !== -1;
      if (Array.isArray(right)) {
        return right.some(function(elem) {
          return elem == left;
        });
      }
      return false;
    }
  },
  "!": {
    type: "unaryOp",
    precedence: Infinity,
    eval: function(right) {
      return !right;
    }
  }
};