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GraphQLTextParser.js
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GraphQLTextParser.js
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/**
* Copyright (c) 2013-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @providesModule GraphQLTextParser
* @flow
* @format
*/
'use strict';
const FileParser = require('./FileParser');
const {Source, parse} = require('graphql');
const fs = require('fs');
const invariant = require('invariant');
const path = require('path');
import type {File} from '../codegen/CodegenTypes';
import type {DocumentNode} from 'graphql';
// Throws an error if parsing the file fails
function parseFile(
baseDir: string,
file: File,
openTag: string,
closeTag: string,
): ?DocumentNode {
const text = fs.readFileSync(path.join(baseDir, file.relPath), 'utf8');
const regex = new RegExp(openTag + '([\\s\\S]*?)' + closeTag, 'g');
let graphqlText;
const astDefinitions = [];
while ((graphqlText = regex.exec(text)) !== null) {
const ast = parse(new Source(graphqlText[1], file.relPath));
invariant(
ast.definitions.length,
'GraphQLTextParser: Expected GraphQL text to contain at least one ' +
'definition (fragment, mutation, query, subscription), got `%s`.',
graphqlText[1],
);
astDefinitions.push(...ast.definitions);
}
return {
kind: 'Document',
definitions: astDefinitions,
};
}
function getParser(baseDir: string, openTag: string, closeTag: string): FileParser {
return new FileParser({
baseDir,
parse: (baseDir: string, file: File) => (
parseFile(baseDir, file, openTag, closeTag)
),
});
}
module.exports = {
getParser,
};