Initial commit

node_modules/ajv/lib/async.js

@@ -0,0 +1,218 @@
+'use strict';
+
+module.exports = {
+  setup: setupAsync,
+  compile: compileAsync
+};
+
+
+var util = require('./compile/util');
+
+var ASYNC = {
+  '*': checkGenerators,
+  'co*': checkGenerators,
+  'es7': checkAsyncFunction
+};
+
+var TRANSPILE = {
+  'nodent': getNodent,
+  'regenerator': getRegenerator
+};
+
+var MODES = [
+  { async: 'co*' },
+  { async: 'es7', transpile: 'nodent' },
+  { async: 'co*', transpile: 'regenerator' }
+];
+
+
+var regenerator, nodent;
+
+
+function setupAsync(opts, required) {
+  if (required !== false) required = true;
+  var async = opts.async
+    , transpile = opts.transpile
+    , check;
+
+  switch (typeof transpile) {
+    case 'string':
+      var get = TRANSPILE[transpile];
+      if (!get) throw new Error('bad transpiler: ' + transpile);
+      return (opts._transpileFunc = get(opts, required));
+    case 'undefined':
+    case 'boolean':
+      if (typeof async == 'string') {
+        check = ASYNC[async];
+        if (!check) throw new Error('bad async mode: ' + async);
+        return (opts.transpile = check(opts, required));
+      }
+
+      for (var i=0; i<MODES.length; i++) {
+        var _opts = MODES[i];
+        if (setupAsync(_opts, false)) {
+          util.copy(_opts, opts);
+          return opts.transpile;
+        }
+      }
+      /* istanbul ignore next */
+      throw new Error('generators, nodent and regenerator are not available');
+    case 'function':
+      return (opts._transpileFunc = opts.transpile);
+    default:
+      throw new Error('bad transpiler: ' + transpile);
+  }
+}
+
+
+function checkGenerators(opts, required) {
+  /* jshint evil: true */
+  try {
+    (new Function('(function*(){})()'))();
+    return true;
+  } catch(e) {
+    /* istanbul ignore next */
+    if (required) throw new Error('generators not supported');
+  }
+}
+
+
+function checkAsyncFunction(opts, required) {
+  /* jshint evil: true */
+  try {
+    (new Function('(async function(){})()'))();
+    /* istanbul ignore next */
+    return true;
+  } catch(e) {
+    if (required) throw new Error('es7 async functions not supported');
+  }
+}
+
+
+function getRegenerator(opts, required) {
+  try {
+    if (!regenerator) {
+      var name = 'regenerator';
+      regenerator = require(name);
+      regenerator.runtime();
+    }
+    if (!opts.async || opts.async === true)
+      opts.async = 'es7';
+    return regeneratorTranspile;
+  } catch(e) {
+    /* istanbul ignore next */
+    if (required) throw new Error('regenerator not available');
+  }
+}
+
+
+function regeneratorTranspile(code) {
+  return regenerator.compile(code).code;
+}
+
+
+function getNodent(opts, required) {
+  /* jshint evil: true */
+  try {
+    if (!nodent) {
+      var name = 'nodent';
+      nodent = require(name)({ log: false, dontInstallRequireHook: true });
+    }
+    if (opts.async != 'es7') {
+      if (opts.async && opts.async !== true) console.warn('nodent transpiles only es7 async functions');
+      opts.async = 'es7';
+    }
+    return nodentTranspile;
+  } catch(e) {
+    /* istanbul ignore next */
+    if (required) throw new Error('nodent not available');
+  }
+}
+
+
+function nodentTranspile(code) {
+  return nodent.compile(code, '', { promises: true, sourcemap: false }).code;
+}
+
+
+/**
+ * Creates validating function for passed schema with asynchronous loading of missing schemas.
+ * `loadSchema` option should be a function that accepts schema uri and node-style callback.
+ * @this  Ajv
+ * @param {Object}   schema schema object
+ * @param {Function} callback node-style callback, it is always called with 2 parameters: error (or null) and validating function.
+ */
+function compileAsync(schema, callback) {
+  /* eslint no-shadow: 0 */
+  /* jshint validthis: true */
+  var schemaObj;
+  var self = this;
+  try {
+    schemaObj = this._addSchema(schema);
+  } catch(e) {
+    setTimeout(function() { callback(e); });
+    return;
+  }
+  if (schemaObj.validate) {
+    setTimeout(function() { callback(null, schemaObj.validate); });
+  } else {
+    if (typeof this._opts.loadSchema != 'function')
+      throw new Error('options.loadSchema should be a function');
+    _compileAsync(schema, callback, true);
+  }
+
+
+  function _compileAsync(schema, callback, firstCall) {
+    var validate;
+    try { validate = self.compile(schema); }
+    catch(e) {
+      if (e.missingSchema) loadMissingSchema(e);
+      else deferCallback(e);
+      return;
+    }
+    deferCallback(null, validate);
+
+    function loadMissingSchema(e) {
+      var ref = e.missingSchema;
+      if (self._refs[ref] || self._schemas[ref])
+        return callback(new Error('Schema ' + ref + ' is loaded but ' + e.missingRef + ' cannot be resolved'));
+      var _callbacks = self._loadingSchemas[ref];
+      if (_callbacks) {
+        if (typeof _callbacks == 'function')
+          self._loadingSchemas[ref] = [_callbacks, schemaLoaded];
+        else
+          _callbacks[_callbacks.length] = schemaLoaded;
+      } else {
+        self._loadingSchemas[ref] = schemaLoaded;
+        self._opts.loadSchema(ref, function (err, sch) {
+          var _callbacks = self._loadingSchemas[ref];
+          delete self._loadingSchemas[ref];
+          if (typeof _callbacks == 'function') {
+            _callbacks(err, sch);
+          } else {
+            for (var i=0; i<_callbacks.length; i++)
+              _callbacks[i](err, sch);
+          }
+        });
+      }
+
+      function schemaLoaded(err, sch) {
+        if (err) return callback(err);
+        if (!(self._refs[ref] || self._schemas[ref])) {
+          try {
+            self.addSchema(sch, ref);
+          } catch(e) {
+            callback(e);
+            return;
+          }
+        }
+        _compileAsync(schema, callback);
+      }
+    }
+
+    function deferCallback(err, validate) {
+      if (firstCall) setTimeout(function() { callback(err, validate); });
+      else return callback(err, validate);
+    }
+  }
+}