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'use strict';
var IDENTIFIER = /^[a-z_$][a-z0-9_$-]*$/i;
var customRuleCode = require('./dotjs/custom');
var definitionSchema = require('./definition_schema');
module.exports = {
add: addKeyword,
get: getKeyword,
remove: removeKeyword,
validate: validateKeyword
};
/**
* Define custom keyword
* @this Ajv
* @param {String} keyword custom keyword, should be unique (including different from all standard, custom and macro keywords).
* @param {Object} definition keyword definition object with properties `type` (type(s) which the keyword applies to), `validate` or `compile`.
* @return {Ajv} this for method chaining
*/
function addKeyword(keyword, definition) {
/* jshint validthis: true */
/* eslint no-shadow: 0 */
var RULES = this.RULES;
if (RULES.keywords[keyword])
throw new Error('Keyword ' + keyword + ' is already defined');
if (!IDENTIFIER.test(keyword))
throw new Error('Keyword ' + keyword + ' is not a valid identifier');
if (definition) {
this.validateKeyword(definition, true);
var dataType = definition.type;
if (Array.isArray(dataType)) {
for (var i=0; i<dataType.length; i++)
_addRule(keyword, dataType[i], definition);
} else {
_addRule(keyword, dataType, definition);
}
var metaSchema = definition.metaSchema;
if (metaSchema) {
if (definition.$data && this._opts.$data) {
metaSchema = {
anyOf: [
metaSchema,
{ '$ref': 'https://raw.githubusercontent.com/epoberezkin/ajv/master/lib/refs/data.json#' }
]
};
}
definition.validateSchema = this.compile(metaSchema, true);
}
}
RULES.keywords[keyword] = RULES.all[keyword] = true;
function _addRule(keyword, dataType, definition) {
var ruleGroup;
for (var i=0; i<RULES.length; i++) {
var rg = RULES[i];
if (rg.type == dataType) {
ruleGroup = rg;
break;
}
}
if (!ruleGroup) {
ruleGroup = { type: dataType, rules: [] };
RULES.push(ruleGroup);
}
var rule = {
keyword: keyword,
definition: definition,
custom: true,
code: customRuleCode,
implements: definition.implements
};
ruleGroup.rules.push(rule);
RULES.custom[keyword] = rule;
}
return this;
}
/**
* Get keyword
* @this Ajv
* @param {String} keyword pre-defined or custom keyword.
* @return {Object|Boolean} custom keyword definition, `true` if it is a predefined keyword, `false` otherwise.
*/
function getKeyword(keyword) {
/* jshint validthis: true */
var rule = this.RULES.custom[keyword];
return rule ? rule.definition : this.RULES.keywords[keyword] || false;
}
/**
* Remove keyword
* @this Ajv
* @param {String} keyword pre-defined or custom keyword.
* @return {Ajv} this for method chaining
*/
function removeKeyword(keyword) {
/* jshint validthis: true */
var RULES = this.RULES;
delete RULES.keywords[keyword];
delete RULES.all[keyword];
delete RULES.custom[keyword];
for (var i=0; i<RULES.length; i++) {
var rules = RULES[i].rules;
for (var j=0; j<rules.length; j++) {
if (rules[j].keyword == keyword) {
rules.splice(j, 1);
break;
}
}
}
return this;
}
/**
* Validate keyword definition
* @this Ajv
* @param {Object} definition keyword definition object.
* @param {Boolean} throwError true to throw exception if definition is invalid
* @return {boolean} validation result
*/
function validateKeyword(definition, throwError) {
validateKeyword.errors = null;
var v = this._validateKeyword = this._validateKeyword
|| this.compile(definitionSchema, true);
if (v(definition)) return true;
validateKeyword.errors = v.errors;
if (throwError)
throw new Error('custom keyword definition is invalid: ' + this.errorsText(v.errors));
else
return false;
}
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