graphql.parser

Class SafeTokenSource

java.lang.Object

graphql.parser.SafeTokenSource

All Implemented Interfaces:

org.antlr.v4.runtime.TokenSource

public class SafeTokenSource
extends java.lang.Object
implements org.antlr.v4.runtime.TokenSource

This token source can wrap a lexer and if it asks for more than a maximum number of tokens the user can take some action, typically throw an exception to stop lexing. It tracks the maximum number per token channel, so we have 3 at the moment, and they will all be tracked. This is used to protect us from evil input. The lexer will eagerly try to find all tokens at times and certain inputs (directives butted together for example) will cause the lexer to keep doing work even though before the tokens are presented back to the parser and hence before it has a chance to stop work once too much as been done.

Constructor Summary

Constructors

Constructor and Description
SafeTokenSource(org.antlr.v4.runtime.TokenSource lexer, int maxTokens, int maxWhitespaceTokens, java.util.function.BiConsumer<java.lang.Integer,org.antlr.v4.runtime.Token> whenMaxTokensExceeded)

Method Summary

Modifier and Type	Method and Description
int	getCharPositionInLine()
org.antlr.v4.runtime.CharStream	getInputStream()
int	getLine()
java.lang.String	getSourceName()
org.antlr.v4.runtime.TokenFactory<?>	getTokenFactory()
org.antlr.v4.runtime.Token	nextToken()
void	setTokenFactory(org.antlr.v4.runtime.TokenFactory<?> factory)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SafeTokenSource

public SafeTokenSource(org.antlr.v4.runtime.TokenSource lexer,
                       int maxTokens,
                       int maxWhitespaceTokens,
                       java.util.function.BiConsumer<java.lang.Integer,org.antlr.v4.runtime.Token> whenMaxTokensExceeded)

Method Detail

nextToken

public org.antlr.v4.runtime.Token nextToken()

Specified by:

nextToken in interface org.antlr.v4.runtime.TokenSource

getLine

public int getLine()

Specified by:

getLine in interface org.antlr.v4.runtime.TokenSource

getCharPositionInLine

public int getCharPositionInLine()

Specified by:

getCharPositionInLine in interface org.antlr.v4.runtime.TokenSource

getInputStream

public org.antlr.v4.runtime.CharStream getInputStream()

Specified by:

getInputStream in interface org.antlr.v4.runtime.TokenSource

getSourceName

public java.lang.String getSourceName()

Specified by:

getSourceName in interface org.antlr.v4.runtime.TokenSource

setTokenFactory

public void setTokenFactory(org.antlr.v4.runtime.TokenFactory<?> factory)

Specified by:

setTokenFactory in interface org.antlr.v4.runtime.TokenSource

getTokenFactory

public org.antlr.v4.runtime.TokenFactory<?> getTokenFactory()

Specified by:

getTokenFactory in interface org.antlr.v4.runtime.TokenSource