graphql-java/src/main/java/graphql/parser/Parser.java at master · emeraldjava/graphql-java · GitHub

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package graphql.parser;

import graphql.Internal;

import graphql.language.Document;

import graphql.parser.antlr.GraphqlLexer;

import graphql.parser.antlr.GraphqlParser;

import org.antlr.v4.runtime.ANTLRInputStream;

import org.antlr.v4.runtime.BailErrorStrategy;

import org.antlr.v4.runtime.CommonTokenStream;

import org.antlr.v4.runtime.Token;

import org.antlr.v4.runtime.atn.PredictionMode;

import org.antlr.v4.runtime.misc.ParseCancellationException;

import java.util.List;

@Internal

public class Parser {

public Document parseDocument(String input) {

GraphqlLexer lexer = new GraphqlLexer(new ANTLRInputStream(input));

CommonTokenStream tokens = new CommonTokenStream(lexer);

GraphqlParser parser = new GraphqlParser(tokens);

parser.removeErrorListeners();

parser.getInterpreter().setPredictionMode(PredictionMode.SLL);

parser.setErrorHandler(new BailErrorStrategy());

GraphqlParser.DocumentContext document = parser.document();

GraphqlAntlrToLanguage antlrToLanguage = new GraphqlAntlrToLanguage(tokens);

antlrToLanguage.visitDocument(document);

Token stop = document.getStop();

List<Token> allTokens = tokens.getTokens();

if (stop != null && allTokens != null && !allTokens.isEmpty()) {

Token last = allTokens.get(allTokens.size() - 1);

// do we have more tokens in the stream than we consumed in the parse?

// if yes then its invalid. We make sure its the same channel

boolean notEOF = last.getType() != Token.EOF;

boolean lastGreaterThanDocument = last.getTokenIndex() > stop.getTokenIndex();

boolean sameChannel = last.getChannel() == stop.getChannel();

if (notEOF && lastGreaterThanDocument && sameChannel) {

throw new ParseCancellationException("There are more tokens in the query that have not been consumed");

}

return antlrToLanguage.result;

}

graphql-java/src/main/java/graphql/parser/Parser.java at master · emeraldjava/graphql-java · GitHub

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