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'use strict';
var MissingRefError = require('./error_classes').MissingRef;
module.exports = compileAsync;
/**
* Creates validating function for passed schema with asynchronous loading of missing schemas.
* `loadSchema` option should be a function that accepts schema uri and returns promise that resolves with the schema.
* @this Ajv
* @param {Object} schema schema object
* @param {Boolean} meta optional true to compile meta-schema; this parameter can be skipped
* @param {Function} callback an optional node-style callback, it is called with 2 parameters: error (or null) and validating function.
* @return {Promise} promise that resolves with a validating function.
*/
function compileAsync(schema, meta, callback) {
/* eslint no-shadow: 0 */
/* global Promise */
/* jshint validthis: true */
var self = this;
if (typeof this._opts.loadSchema != 'function')
throw new Error('options.loadSchema should be a function');
if (typeof meta == 'function') {
callback = meta;
meta = undefined;
}
var p = loadMetaSchemaOf(schema).then(function () {
var schemaObj = self._addSchema(schema, undefined, meta);
return schemaObj.validate || _compileAsync(schemaObj);
});
if (callback) {
p.then(
function(v) { callback(null, v); },
callback
);
}
return p;
function loadMetaSchemaOf(sch) {
var $schema = sch.$schema;
return $schema && !self.getSchema($schema)
? compileAsync.call(self, { $ref: $schema }, true)
: Promise.resolve();
}
function _compileAsync(schemaObj) {
try { return self._compile(schemaObj); }
catch(e) {
if (e instanceof MissingRefError) return loadMissingSchema(e);
throw e;
}
function loadMissingSchema(e) {
var ref = e.missingSchema;
if (added(ref)) throw new Error('Schema ' + ref + ' is loaded but ' + e.missingRef + ' cannot be resolved');
var schemaPromise = self._loadingSchemas[ref];
if (!schemaPromise) {
schemaPromise = self._loadingSchemas[ref] = self._opts.loadSchema(ref);
schemaPromise.then(removePromise, removePromise);
}
return schemaPromise.then(function (sch) {
if (!added(ref)) {
return loadMetaSchemaOf(sch).then(function () {
if (!added(ref)) self.addSchema(sch, ref, undefined, meta);
});
}
}).then(function() {
return _compileAsync(schemaObj);
});
function removePromise() {
delete self._loadingSchemas[ref];
}
function added(ref) {
return self._refs[ref] || self._schemas[ref];
}
}
}
}
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