workflow-4-node/lib/es5/activities/expression.js

Workflow 4 Node is a .NET Workflow Foundation like framework for Node.js. The goal is to reach feature equivalence and beyond.

/* jshint -W054*/
"use strict";

var Activity = require("./activity");
var util = require("util");
var _ = require("lodash");
var errors = require("../common/errors");

function Expression(expr) {
    Activity.call(this);
    this.expr = expr || null;
    this.nonSerializedProperties.add("_f");
}

util.inherits(Expression, Activity);

Expression.prototype.run = function (callContext, args) {
    var self = this;
    var expr = self.expr;
    if (expr) {
        try {
            var f = self._f;
            if (!f) {
                f = self._f = new Function("_", "return (" + expr + ")");
            }
            var result = f.call(self, _);
            if (result === callContext.activity) {
                var parent = this.$parent;
                if (!parent) {
                    callContext.fail(new errors.ActivityRuntimeError("Exception can't reference itself."));
                    return;
                }
                result = f.call(parent, _);
            }
            callContext.complete(result);
        } catch (e) {
            callContext.fail(e);
        }
    } else {
        callContext.complete(null);
    }
};

module.exports = Expression;
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