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href="SyntaxTree.html#.%25E2%258C%25BE%25E2%25A0%2580fromSchema">⌾⠀fromSchema</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#.%25E2%258E%2586%25E2%25A0%2580constructor">⎆⠀constructor</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580appendDefinitions">⌾⠀appendDefinitions</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580consumeDefinition">⌾⠀consumeDefinition</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a href="SyntaxTree.html#%25E2%258C%25BE%25E2%25A0%2580find">⌾⠀find</a></span></li><li class="nav-item"><span class="nav-item-type type-function">F</span><span class="nav-item-name"><a 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  <h1 class="page-title">IDLFileHandler.js</h1>
  
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  <section>
      <article>
          <pre class="prettyprint source linenums"><code>/**
* The handler, an instance of which is created for every instance of GQLBase.
* The handler manages the fetching and decoding of files bearing the IDL
* schema associated with the class represented by this instance of GQLBase.
*
* @class IDLFileHandler
*/
49export class IDLFileHandler {
path: ?string;
51
extension: ?string;
53
/**
 * The IDLFileHandler checks the SCHEMA value returned by the class type
 * of the supplied instance. If the resulting value is a Symbol, then the
 * handler's responsibility is to find the file, load it from disk and
 * provide various means of using its contents; i.e. as a Buffer, a String
 * or wrapped in a SyntaxTree instance.
 *
 * @memberof IDLFileHandler
 * @method ⎆⠀constructor
 * @constructor
 *
 * @param {Function} Class a function or class definition that presumably
 * extends from GQLBase were it an instance.
 */
constructor(Class: Function) {
  // $FlowFixMe
  const symbol = typeof Class.SCHEMA === 'symbol' &amp;&amp; Class.SCHEMA || null;
  const pattern = /Symbol\(Path (.*?) Extension (.*?)\)/;
72
  if (symbol) {
    let symbolString = symbol.toString();
75
    if (symbol === Class.ADJACENT_FILE) {
      if (Class.module === module) {
        throw new Error(`
          The a static getter for 'module' on ${Class.name} must be present
          that returns the module object where the Class is defined. Try the
          following:
82
          // your ${Class.name}.js file
          import { GQLBase } from 'graphql-lattice'
85
          const ${Class.name}Module = module;
87
          class ${Class.name} extends GQLBase {
            ...
90
            static get module() {
              return ${Class.name}Module;
            }
          }
95
        `);
      }
98
      const filename = Class.module.filename;
      const extension = Path.extname(filename)
      const dir = Path.dirname(filename)
      const filefixed = Path.basename(filename, extension)
      const build = Path.resolve(Path.join(dir, `${filefixed}.graphql`))
104
      this.path = build;
      this.extension = '.graphql';
    }
    else if (pattern.test(symbolString)) {
      const parsed = pattern.exec(symbolString);
      const extension = parsed[2] || '.graphql'
      const dir = Path.dirname(parsed[1])
      const file = Path.basename(parsed[1], extension)
      const build = Path.resolve(Path.join(dir, `${file}${extension}`))
114
      this.path = build;
      this.extension = extension;
    }
  }
  else {
    this.path = this.extension = null;
  }
}
123
/**
 * Loads the calculated file determined by the decoding of the meaning of
 * the Symbol returned by the SCHEMA property of the instance supplied to
 * the IDLFileHandler upon creation.
 *
 * @instance
 * @memberof IDLFileHandler
 * @method ⌾⠀getFile
 *
 * @return {Buffer|null} returns the Buffer containing the file base IDL
 * schema or null if none was found or a direct string schema is returned
 * by the SCHEMA property
 */
getFile(): Buffer {
  return fs.readFileSync(String(this.path));
}
140
/**
 * If getFile() returns a Buffer, this is the string representation of the
 * underlying file contents. As a means of validating the contents of the
 * file, the string contents are parsed into an AST and back to a string.
 *
 * @instance
 * @memberof IDLFileHandler
 * @method ⌾⠀getSchema
 *
 * @return {string|null} the string contents of the Buffer containing the
 * file based IDL schema.
 */
getSchema(): ?string {
  if (!this.path) { return null; }
155
  const tree = this.getSyntaxTree();
157
  return tree.toString();
}
160
/**
 * If getFile() returns a Buffer, the string contents are passed to a new
 * instance of SyntaxTree which parses this into an AST for manipulation.
 *
 * @instance
 * @memberof IDLFileHandler
 * @method ⌾⠀getSyntaxTree
 *
 * @return {SyntaxTree|null} a SyntaxTree instance constructed from the IDL
 * schema contents loaded from disk. Null is returned if a calculated path
 * cannot be found; always occurs when SCHEMA returns a string.
 */
getSyntaxTree(): SyntaxTree {
  const buffer = this.getFile();
  const tree = new SyntaxTree(buffer.toString());
176
  return tree;
}
179
/**
 * Returns the `constructor` name. If invoked as the context, or `this`,
 * object of the `toString` method of `Object`'s `prototype`, the resulting
 * value will be `[object MyClass]`, given an instance of `MyClass`
 *
 * @method ⌾⠀[Symbol.toStringTag]
 * @memberof IDLFileHandler
 *
 * @return {string} the name of the class this is an instance of
 * @ComputedType
 */
get [Symbol.toStringTag]() { return this.constructor.name }
192
/**
 * Applies the same logic as {@link #[Symbol.toStringTag]} but on a static
 * scale. So, if you perform `Object.prototype.toString.call(MyClass)`
 * the result would be `[object MyClass]`.
 *
 * @method ⌾⠀[Symbol.toStringTag]
 * @memberof IDLFileHandler
 * @static
 *
 * @return {string} the name of this class
 * @ComputedType
 */
static get [Symbol.toStringTag]() { return this.name }
206}
207
208export default IDLFileHandler</code></pre>
      </article>
  </section>
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