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1
| "use strict";
var _ = require("lodash"),
Safe = require("../../Safe"),
Type = require("../../Type"),
Assert = require("../../Assert"),
ExceptionList = require("../../Exception/ExceptionList"),
Exception = require("../../Exception/Exception"),
Types = require("../Types");
/**
*
* Prepares and validates the SchemaDefinition for the given
* value.
*
* @throw {ExceptionList}
*
* @param {SchemaDefinition} schema
* @param {*} value
* @param {Object} validationFns
*
* @return {SchemaDefinition}
*
*/
var prepareSchema = function(schema, value, validationFns){
value = Safe.value(value);
validationFns = Safe.object(validationFns);
/* jshint -W064 */
var errors = new ExceptionList();
/// If not defined and its required throw
/* jshint -W041 */
if(schema.required && value == null){
errors.push(
new Exception("VALIDATION_REQUIRED"));
}
/* jshint -W041 */
else if(!schema.required && value == null){
/// continue (optional parameter)
}
/// check for compatibility of types if any flag is not used
else if(!schema.any && Type.of(schema.schema) !== Type.of(value)){
errors.push(
new Exception("VALIDATION_TYPE", { expected: Type.of(schema.schema), value: Type.of(value) }));
}
/// if there's error throw them
if(errors.length){
throw errors;
}
return schema;
};
/**
*
* Prepares and validates the SchemaDefinition for the given
* object.
*
* @throws {ExceptionList} If a validation function occurs
*
* @param {SchemaDefinition} schema
* @param {Object} value
*
* @return {SchemaDefinition}
*
*/
var prepareObject = function(schema, value){
value = Safe.object(value);
/* jshint -W064 */
var errors = new ExceptionList(),
result = {},
valueKeys = _.keys(value);
_.each(
schema.schema,
function(schemaValue, key){
var isRegExp = Type.isRegExpStr(key),
keys = [];
/// key is not a regexp string
if(!isRegExp){
keys = [ key ];
}
else {
/// key is a regexp string
var regexp = Safe.regexp(key);
keys = _.filter(
valueKeys,
function(key){
/// if there's a definition of the schema don't include it
if(schema.schema[key] !== undefined){
return false;
}
/// test if the regex match
return !!regexp.exec(key);
});
}
_.each(keys, function(val) {
result[val] = schemaValue;
});
});
return schema.clone({
schema: result
});
};
/**
*
* Prepares and validates the SchemaDefinition for the given
* array.
*
* @throws {ExceptionList} If a validation error occurs
*
* @param {SchemaDefinition} schema
* @param {Array} value
*
* @return {SchemaDefinition}
*
*/
var prepareArray = function(schema, value){
value = Safe.array(value);
/* jshint -W064 */
var errors = new ExceptionList(),
result = [],
index = 0;
if( !schema.repeatable && schema.schema.length != value.length ){
errors.push(
new Exception("VALIDATION_INVALID_LIST_LENGTH", { value: value.length, expected: schema.schema.length }));
}
if(schema.repeatable){
var isRepeatable = true;
/// if the value contains elements check if its divisible by
/// the repeat count
if(value.length > 0 && value.length != schema.schema.length){
isRepeatable = value.length % schema.schema.length === 0;
}
/// otherwise is only repeatable if the array contains no
/// element
else {
isRepeatable = (value.length === schema.schema.length) && (value.length === 0);
}
if(!isRepeatable){
errors.push(
new Exception("VALIDATION_INVALID_LIST_LENGTH_MULTIPLE_OF", { value: value.length, expected: schema.schema.length }));
}
}
/// if errors exist throw them
if(errors.length){
throw errors;
}
/// create the result array
for(var i=0; i<value.length; i++){
if(schema.repeatable && index >= schema.schema.length){
index = 0;
}
result.push(schema.schema[index++]);
}
return schema.clone({
schema: result
});
};
/**
*
* Schema Conversion conversion methods
*
* @type {Object}
*
*/
var SchemaExecutionHelper = {
/**
*
* Get the value according to the given schema, by applying
* default values, coercing values, ...
*
* @throws {ExceptionList} If the validation fails
*
* @param {SchemaDefinition} schema
* @param {*} value
*
* @return {*}
*
*/
prepareValue: function(schema, value, validationFns){
/// validate and normalize arguments
Assert.instanceOf(Types.SchemaDefinition)
.assert(schema);
value = Safe.value(value);
/// initalize the list of errors
var errors = new ExceptionList();
/// if not strict tries to normalize
/// the value (e.g. a number can be on string representation )
if(!schema.strict){
value = Safe.coerce(value, schema.schema);
}
/// if the value is required and it has no value, throw error
/* jshint -W041 */
if(schema.required && value == null){
errors.push(
new Exception("VALIDATION_REQUIRED"));
}
else if(!schema.required && value == null){
/// ignore, and not fallback on the other else's
}
/// if a value exists find out if types are compatible
else if(!schema.any && Type.of(schema.schema) !== Type.of(value)){
errors.push(
new Exception("VALIDATION_TYPE", { expected: Type.of(schema.schema), value: Type.of(value) }));
}
/// always run if value is required or value is specified.
if(schema.required || value !=null){
_.each(
schema.validations,
function(v){
v = Safe.object(v);
var fn = Safe.function(validationFns[v.name]),
args = Safe.array(v.args);
try{
fn.apply({}, [value].concat(args));
}catch(e){
var error = new Exception(e.message);
errors.push(error);
}
});
}
/// check if any error was detected
if(errors.length){
throw errors;
}
return value;
},
/**
*
* Gets the schema for the given value. If the schema is an object it
* will expand its keys regular expressions. If the schema is an array
* it will apply its properties to the given value.
*
* @throws {ExceptionList} If a validation error occurs
*
* @param {SchemaDefinition} schema
* @param {*} value
* @param {Object} validationFns
*
* @return {SchemaDefinition}
*
*/
prepareSchema: function(schema, value, validationFns){
Assert.instanceOf(Types.SchemaDefinition)
.assert(schema);
/// prepare the schema
schema = prepareSchema(schema, value, validationFns);
/// prepare the object
if(schema.isObject()){
return prepareObject(schema, value);
}
/// prepare the array
else if(schema.isArray()){
return prepareArray(schema, value);
}
return schema;
}
};
module.exports = SchemaExecutionHelper;
|