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| 'use strict';
var _ = require("lodash"),
Type = require("./Type"),
Safe = require("./Safe"),
Chain = require("./Chain"),
ChainContext = require("./Chain/ChainContext"),
Types = require("./Schema/Types"),
SchemaDefinition = require("./Schema/SchemaDefinition"),
SchemaEvaluator = require("./Schema/SchemaEvaluator");
/**
*
* Internal methods wrapper
*
* @type {Object}
*
*/
var Internal = {};
/**
*
* Wraps the validation functions in order to change the SchemaDefinition context
* when applied.
*
* @param {String} name
*
* @return {ValidationFunction}
*
*/
Internal.wrapValidationFunction = function(name){
/// arguments normalization
name = Safe.string(name);
/// return the wrapped function
return function(){
/// get the actual arguments
var args = _.toArray(arguments);
/// first argument is the eval object, so discard it.
args.shift();
/// last argument is the chain argument option, so discard it
args.pop();
/// add the value definition to the SchemaDefinition list
this.validations.push({
name: name,
args: args
});
};
};
/**
*
* SchemaDefinition compile options.
*
* @type {Object}
*
*/
Internal.compileOptions = {
/**
*
* Prepare the given value for the SchemaDefinition
* conversion. If the value is instance of Schema get
* its SchemaDefinition value for the conversions
*
* @param {*} val
*
* @return {*}
*
*/
prepare: function(val){
if(Type.instanceOf(val, Types.Schema)){
var schemaData = val.serialize();
val = new SchemaDefinition(schemaData, {
prepare: function(val){
return new SchemaDefinition(val, { compile: false });
}
});
}
return val;
}
};
/**
*
* The Schema Chainable functions
*
* @type {Object}
*
*/
var SchemaChainableFns = {
any: function(){
this.any = true;
this.schema = null;
},
strict: function(){
this.strict = true;
},
string : function(val, obj){
this.schema = "";
this.required = true;
this.any = false;
},
object : function(val, obj){
obj = Safe.object(obj, {});
this.schema = obj;
this.required = true;
this.any = false;
},
array : function(val, obj){
obj = Safe.array(obj, []);
this.schema = obj;
this.required = true;
this.any = false;
},
function : function(){
this.schema = function(){};
this.required = true;
this.any = false;
},
number : function(){
this.schema = 0;
this.required = true;
this.any = false;
},
boolean : function(){
this.schema = Boolean(true);
this.required = true;
this.any = false;
},
default : function(val, defaultValue){
this.default = defaultValue;
},
required : function(){
this.required = true;
},
optional : function(){
this.required = false;
},
repeatable: function(){
this.repeatable = true;
}
};
/**
*
* The default Custom Chainable Functions
*
* @type {Object}
*
*/
var CustomChainableFns = {
"min": require("./Assert/Min"),
"max": require("./Assert/Max"),
"regex": require("./Assert/Regex"),
};
/**
*
* The evaluation functions
*
* @type {Object}
*
*/
var EvaluationFns = {
/**
*
* Compile the rule and return the facade
*
* @return {SchemaEvaluator}
*
*/
compile: function(result, argument, err){
/// throw error if there was some in the chain
Iif(err){
throw err;
}
return new SchemaEvaluator(this, argument, Internal.compileOptions);
},
/**
*
* Apply the schema rules and return the value.
*
* @throws {Error} If the value is invalid
*
* @param {*} result
* @param {Object} argument
* @return {*}
*
*/
value: function(result, argument, err){
/// throw error if there was some in the chain
Iif(err){
throw err;
}
var r = new SchemaEvaluator(this, argument, Internal.compileOptions);
return r.value(result);
},
/**
*
* Get the list of errors
*
* @param {*} result
* @param {Object} argument
* @return {*}
*
*/
errors: function(result, argument, err){
/// throw error if there was some in the chain
Iif(err){
throw err;
}
var r = new SchemaEvaluator(this, argument, Internal.compileOptions);
return r.errors(result);
},
/**
*
* Check if the object is valid
*
* @param {*} result
* @param {Object} argument
* @return {Boolean}
*
*/
isValid: function(result, argument, err){
/// throw error if there was some in the chain
Iif(err) {
throw err;
}
var r = new SchemaEvaluator(this, argument, Internal.compileOptions);
return r.isValid(result);
},
/**
*
* Serialize the schema rule
*
* @return {Object}
*
*/
serialize: function(result, argument, err){
var evaluator = new SchemaEvaluator(this, argument, Internal.compileOptions);
return evaluator.serialize();
},
/**
*
* Deserialize from the schema from the given value.
*
* @return {SchemaEvaluator}
*
*/
deserialize: function(value, argument, err){
var evaluator = new SchemaEvaluator(this, argument, Internal.compileOptions);
return evaluator.deserialize(value);
}
};
/**
*
* Schema Chain Facility
*
* @param {Object} customFns
*
*
*/
var Schema = function(customFns){
customFns = Safe.object(customFns);
/// get the Schema validation functions. This is an extension point
/// for the schema validation.
var validationFns = _.extend({}, customFns, CustomChainableFns);
/// Get the current ChainContext of the assertion, in order
/// to keep the assertion state.
var chainContext = null;
_.each(arguments, function(arg){
if(arg instanceof ChainContext){
chainContext = arg;
return false;
}
});
/// if there's no chain context initialize the default functions by
/// wrapping them in a compatible API
if(!chainContext){
/// assign the default validation functions
var schemaFns = _.extend({}, SchemaChainableFns);
/// transform the custom validation functions, to use the Schema
/// runner
var wrappedFns = _.extend({}, CustomChainableFns, customFns);
_.each(wrappedFns, function(fn, name){
wrappedFns[name] = Internal.wrapValidationFunction(name);
});
/// give precedence to schemaFns
customFns = _.extend(wrappedFns, schemaFns);
}
/// the chain options
var chainOptions = {
/// do not pipe the chainable fns objects
pipe: false,
/// Use the Schema type for each chaninable return statement
type: Schema,
/// set the scope for each chainable function execution.
scope: function() {
return new SchemaDefinition(null, { compile: false });
},
/// Evaluation argument. This argument will be present in every
/// evalFn invocation without interfere with the chain scope.
argument: validationFns
};
/// Inherit from Chains
Chain.apply(this, [ customFns, EvaluationFns, chainOptions, chainContext ]);
return new Types.Schema(this);
};
module.exports = Schema;
|