Package com.puppycrawl.tools.checkstyle

Class JavaParser

java.lang.Object

com.puppycrawl.tools.checkstyle.JavaParser

public final class JavaParser
extends Object

Helper methods to parse java source files.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	JavaParser.CheckstyleErrorListener	Custom error listener to provide detailed exception message.
static class	JavaParser.Options	Enum to be used for test if comments should be used.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	JavaParser()	Stop instances being created.

Method Summary

Modifier and Type	Method	Description
static DetailAST	appendHiddenCommentNodes(DetailAST root)	Appends comment nodes to existing AST.
private static DetailAST	createCommentAstFromToken(org.antlr.v4.runtime.CommonToken token)	Create comment AST from token.
private static DetailAST	createSlCommentNode(org.antlr.v4.runtime.Token token)	Create single-line comment from token.
static DetailAST	parse(FileContents contents)	Static helper method to parses a Java source file.
static DetailAST	parseFile(File file, JavaParser.Options options)	Parses Java source file.
static DetailAST	parseFileText(FileText text, JavaParser.Options options)	Parse a text and return the parse tree.

Methods inherited from class java.lang.Object

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

Constructor Detail

JavaParser

private JavaParser()

Stop instances being created.

Method Detail

parse

public static DetailAST parse(FileContents contents)
                       throws CheckstyleException

Static helper method to parses a Java source file.

Parameters:

contents - contains the contents of the file

Returns:

the root of the AST

Throws:

CheckstyleException - if the contents is not a valid Java source

parseFileText

public static DetailAST parseFileText(FileText text,
                                      JavaParser.Options options)
                               throws CheckstyleException

Parse a text and return the parse tree.

Parameters:

text - the text to parse

options - JavaParser.Options to control inclusion of comment nodes

Returns:

the root node of the parse tree

Throws:

CheckstyleException - if the text is not a valid Java source

parseFile

public static DetailAST parseFile(File file,
                                  JavaParser.Options options)
                           throws IOException,
                                  CheckstyleException

Parses Java source file.

Parameters:

file - the file to parse

options - JavaParser.Options to control inclusion of comment nodes

Returns:

DetailAST tree

Throws:

IOException - if the file could not be read

CheckstyleException - if the file is not a valid Java source file

appendHiddenCommentNodes

public static DetailAST appendHiddenCommentNodes(DetailAST root)

Appends comment nodes to existing AST. It traverses each node in AST, looks for hidden comment tokens and appends found comment tokens as nodes in AST.

Parameters:

root - of AST

Returns:

root of AST with comment nodes

createCommentAstFromToken

private static DetailAST createCommentAstFromToken(org.antlr.v4.runtime.CommonToken token)

Create comment AST from token. Depending on token type SINGLE_LINE_COMMENT or BLOCK_COMMENT_BEGIN is created.

Parameters:

token - to create the AST

Returns:

DetailAST of comment node

createSlCommentNode

private static DetailAST createSlCommentNode(org.antlr.v4.runtime.Token token)

Create single-line comment from token.

Parameters:

token - to create the AST

Returns:

DetailAST with SINGLE_LINE_COMMENT type