liquid-node/lib/liquid/condition.js

Node.js port of Tobias Lütke's Liquid template engine.

// Generated by CoffeeScript 1.10.0
(function() {
  var Condition, Liquid;

  Liquid = require("../liquid");

  module.exports = Condition = (function() {
    var LITERALS;

    Condition.operators = {
      '==': function(cond, left, right) {
        return cond.equalVariables(left, right);
      },
      'is': function(cond, left, right) {
        return cond.equalVariables(left, right);
      },
      '!=': function(cond, left, right) {
        return !cond.equalVariables(left, right);
      },
      '<>': function(cond, left, right) {
        return !cond.equalVariables(left, right);
      },
      'isnt': function(cond, left, right) {
        return !cond.equalVariables(left, right);
      },
      '<': function(cond, left, right) {
        return left < right;
      },
      '>': function(cond, left, right) {
        return left > right;
      },
      '<=': function(cond, left, right) {
        return left <= right;
      },
      '>=': function(cond, left, right) {
        return left >= right;
      },
      'contains': function(cond, left, right) {
        return (left != null ? typeof left.indexOf === "function" ? left.indexOf(right) : void 0 : void 0) >= 0;
      }
    };

    function Condition(left1, operator, right1) {
      this.left = left1;
      this.operator = operator;
      this.right = right1;
      this.childRelation = null;
      this.childCondition = null;
    }

    Condition.prototype.evaluate = function(context) {
      var result;
      if (context == null) {
        context = new Liquid.Context();
      }
      result = this.interpretCondition(this.left, this.right, this.operator, context);
      switch (this.childRelation) {
        case "or":
          return Promise.resolve(result).then((function(_this) {
            return function(result) {
              return result || _this.childCondition.evaluate(context);
            };
          })(this));
        case "and":
          return Promise.resolve(result).then((function(_this) {
            return function(result) {
              return result && _this.childCondition.evaluate(context);
            };
          })(this));
        default:
          return result;
      }
    };

    Condition.prototype.or = function(childCondition) {
      this.childCondition = childCondition;
      return this.childRelation = "or";
    };

    Condition.prototype.and = function(childCondition) {
      this.childCondition = childCondition;
      return this.childRelation = "and";
    };

    Condition.prototype.attach = function(attachment) {
      return this.attachment = attachment;
    };

    Condition.prototype.equalVariables = function(left, right) {
      if (typeof left === "function") {
        return left(right);
      } else if (typeof right === "function") {
        return right(left);
      } else {
        return left === right;
      }
    };

    LITERALS = {
      empty: function(v) {
        return !((v != null ? v.length : void 0) > 0);
      },
      blank: function(v) {
        return !v || v.toString().length === 0;
      }
    };

    Condition.prototype.resolveVariable = function(v, context) {
      if (v in LITERALS) {
        return Promise.resolve(LITERALS[v]);
      } else {
        return context.get(v);
      }
    };

    Condition.prototype.interpretCondition = function(left, right, op, context) {
      var operation;
      if (op == null) {
        return this.resolveVariable(left, context);
      }
      operation = Condition.operators[op];
      if (operation == null) {
        throw new Error("Unknown operator " + op);
      }
      left = this.resolveVariable(left, context);
      right = this.resolveVariable(right, context);
      return Promise.all([left, right]).then((function(_this) {
        return function(arg) {
          var left, right;
          left = arg[0], right = arg[1];
          return operation(_this, left, right);
        };
      })(this));
    };

    return Condition;

  })();

}).call(this);

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