source: Dev/trunk/src/client/dojox/json/schema.js

define(["dojo/_base/kernel", "dojox", "dojo/_base/array"], function(dojo, dojox){

dojo.getObject("json.schema", true, dojox);


dojox.json.schema.validate = function(/*Any*/instance,/*Object*/schema){
        // summary:
        //              To use the validator call this with an instance object and an optional schema object.
        //              If a schema is provided, it will be used to validate. If the instance object refers to a schema (self-validating),
        //              that schema will be used to validate and the schema parameter is not necessary (if both exist,
        //              both validations will occur).
        // instance:
        //              The instance value/object to validate
        // schema:
        //              The schema to use to validate
        // description:
        //              The validate method will return an object with two properties:
        //
        //              - valid: A boolean indicating if the instance is valid by the schema
        //              - errors: An array of validation errors. If there are no errors, then an
        //                empty list will be returned. A validation error will have two properties:
        //              - property: which indicates which property had the error
        //              - message: which indicates what the error was

        return this._validate(instance,schema,false);
};
dojox.json.schema.checkPropertyChange = function(/*Any*/value,/*Object*/schema, /*String*/ property){
        // summary:
        //              The checkPropertyChange method will check to see if an value can legally be in property with the given schema
        //              This is slightly different than the validate method in that it will fail if the schema is readonly and it will
        //              not check for self-validation, it is assumed that the passed in value is already internally valid.
        //              The checkPropertyChange method will return the same object type as validate, see JSONSchema.validate for
        //              information.
        // value:
        //              The new instance value/object to check
        // schema:
        //              The schema to use to validate
        // returns:
        //              see dojox.validate.jsonSchema.validate

        return this._validate(value,schema, property || "property");
};
dojox.json.schema.mustBeValid = function(result){
        // summary:
        //              This checks to ensure that the result is valid and will throw an appropriate error message if it is not
        // result: the result returned from checkPropertyChange or validate
        if(!result.valid){
                throw new TypeError(dojo.map(result.errors,function(error){return "for property " + error.property + ': ' + error.message;}).join(", "));
        }
};
dojox.json.schema._validate = function(/*Any*/instance,/*Object*/schema,/*Boolean*/ _changing){
        
        var errors = [];
                // validate a value against a property definition
        function checkProp(value, schema, path,i){
                var l;
                path += path ? typeof i == 'number' ? '[' + i + ']' : typeof i == 'undefined' ? '' : '.' + i : i;
                function addError(message){
                        errors.push({property:path,message:message});
                }
                
                if((typeof schema != 'object' || schema instanceof Array) && (path || typeof schema != 'function')){
                        if(typeof schema == 'function'){
                                if(!(Object(value) instanceof schema)){
                                        addError("is not an instance of the class/constructor " + schema.name);
                                }
                        }else if(schema){
                                addError("Invalid schema/property definition " + schema);
                        }
                        return null;
                }
                if(_changing && schema.readonly){
                        addError("is a readonly field, it can not be changed");
                }
                if(schema['extends']){ // if it extends another schema, it must pass that schema as well
                        checkProp(value,schema['extends'],path,i);
                }
                // validate a value against a type definition
                function checkType(type,value){
                        if(type){
                                if(typeof type == 'string' && type != 'any' &&
                                                (type == 'null' ? value !== null : typeof value != type) &&
                                                !(value instanceof Array && type == 'array') &&
                                                !(type == 'integer' && value%1===0)){
                                        return [{property:path,message:(typeof value) + " value found, but a " + type + " is required"}];
                                }
                                if(type instanceof Array){
                                        var unionErrors=[];
                                        for(var j = 0; j < type.length; j++){ // a union type
                                                if(!(unionErrors=checkType(type[j],value)).length){
                                                        break;
                                                }
                                        }
                                        if(unionErrors.length){
                                                return unionErrors;
                                        }
                                }else if(typeof type == 'object'){
                                        var priorErrors = errors;
                                        errors = [];
                                        checkProp(value,type,path);
                                        var theseErrors = errors;
                                        errors = priorErrors;
                                        return theseErrors;
                                }
                        }
                        return [];
                }
                if(value === undefined){
                        if(!schema.optional){
                                addError("is missing and it is not optional");
                        }
                }else{
                        errors = errors.concat(checkType(schema.type,value));
                        if(schema.disallow && !checkType(schema.disallow,value).length){
                                addError(" disallowed value was matched");
                        }
                        if(value !== null){
                                if(value instanceof Array){
                                        if(schema.items){
                                                if(schema.items instanceof Array){
                                                        for(i=0,l=value.length; i<l; i++){
                                                                errors.concat(checkProp(value[i],schema.items[i],path,i));
                                                        }
                                                }else{
                                                        for(i=0,l=value.length; i<l; i++){
                                                                errors.concat(checkProp(value[i],schema.items,path,i));
                                                        }
                                                }
                                        }
                                        if(schema.minItems && value.length < schema.minItems){
                                                addError("There must be a minimum of " + schema.minItems + " in the array");
                                        }
                                        if(schema.maxItems && value.length > schema.maxItems){
                                                addError("There must be a maximum of " + schema.maxItems + " in the array");
                                        }
                                }else if(schema.properties){
                                        errors.concat(checkObj(value,schema.properties,path,schema.additionalProperties));
                                }
                                if(schema.pattern && typeof value == 'string' && !value.match(schema.pattern)){
                                        addError("does not match the regex pattern " + schema.pattern);
                                }
                                if(schema.maxLength && typeof value == 'string' && value.length > schema.maxLength){
                                        addError("may only be " + schema.maxLength + " characters long");
                                }
                                if(schema.minLength && typeof value == 'string' && value.length < schema.minLength){
                                        addError("must be at least " + schema.minLength + " characters long");
                                }
                                if(typeof schema.minimum !== undefined && typeof value == typeof schema.minimum &&
                                                schema.minimum > value){
                                        addError("must have a minimum value of " + schema.minimum);
                                }
                                if(typeof schema.maximum !== undefined && typeof value == typeof schema.maximum &&
                                                schema.maximum < value){
                                        addError("must have a maximum value of " + schema.maximum);
                                }
                                if(schema['enum']){
                                        var enumer = schema['enum'];
                                        l = enumer.length;
                                        var found;
                                        for(var j = 0; j < l; j++){
                                                if(enumer[j]===value){
                                                        found=1;
                                                        break;
                                                }
                                        }
                                        if(!found){
                                                addError("does not have a value in the enumeration " + enumer.join(", "));
                                        }
                                }
                                if(typeof schema.maxDecimal == 'number' &&
                                        (value.toString().match(new RegExp("\\.[0-9]{" + (schema.maxDecimal + 1) + ",}")))){
                                        addError("may only have " + schema.maxDecimal + " digits of decimal places");
                                }
                        }
                }
                return null;
        }
        // validate an object against a schema
        function checkObj(instance,objTypeDef,path,additionalProp){
        
                if(typeof objTypeDef =='object'){
                        if(typeof instance != 'object' || instance instanceof Array){
                                errors.push({property:path,message:"an object is required"});
                        }
                        
                        for(var i in objTypeDef){
                                if(objTypeDef.hasOwnProperty(i) && !(i.charAt(0) == '_' && i.charAt(1) == '_')){
                                        var value = instance[i];
                                        var propDef = objTypeDef[i];
                                        checkProp(value,propDef,path,i);
                                }
                        }
                }
                for(i in instance){
                        if(instance.hasOwnProperty(i) && !(i.charAt(0) == '_' && i.charAt(1) == '_') && objTypeDef && !objTypeDef[i] && additionalProp===false){
                                errors.push({property:path,message:(typeof value) + "The property " + i +
                                                " is not defined in the schema and the schema does not allow additional properties"});
                        }
                        var requires = objTypeDef && objTypeDef[i] && objTypeDef[i].requires;
                        if(requires && !(requires in instance)){
                                errors.push({property:path,message:"the presence of the property " + i + " requires that " + requires + " also be present"});
                        }
                        value = instance[i];
                        if(objTypeDef && typeof objTypeDef == 'object' && !(i in objTypeDef)){
                                checkProp(value,additionalProp,path,i);
                        }
                        if(!_changing && value && value.$schema){
                                errors = errors.concat(checkProp(value,value.$schema,path,i));
                        }
                }
                return errors;
        }
        if(schema){
                checkProp(instance,schema,'',_changing || '');
        }
        if(!_changing && instance && instance.$schema){
                checkProp(instance,instance.$schema,'','');
        }
        return {valid:!errors.length,errors:errors};
};

return dojox.json.schema;
});