com.puppycrawl.tools.checkstyle.utils

Class TokenUtil

java.lang.Object

com.puppycrawl.tools.checkstyle.utils.TokenUtil

public final class TokenUtil
extends java.lang.Object

Contains utility methods for tokens.

Field Summary

Fields

Modifier and Type	Field and Description
private static java.lang.String	TOKEN_ID_EXCEPTION_FORMAT Format for exception message when getting token by given id.
private static int[]	TOKEN_IDS Array of all token IDs.
private static java.lang.String	TOKEN_NAME_EXCEPTION_FORMAT Format for exception message when getting token by given name.
private static java.util.Map<java.lang.String,java.lang.Integer>	TOKEN_NAME_TO_VALUE Maps from a token name to value.
private static java.util.Map<java.lang.Integer,java.lang.String>	TOKEN_VALUE_TO_NAME Maps from a token value to name.

Constructor Summary

Constructors

Modifier	Constructor and Description
private	TokenUtil() Stop instances being created.

Method Summary

Modifier and Type	Method and Description
static boolean	areOnSameLine(DetailAST ast1, DetailAST ast2) Determines if two ASTs are on the same line.
static java.util.Optional<DetailAST>	findFirstTokenByPredicate(DetailAST root, java.util.function.Predicate<DetailAST> predicate) Finds the first Optional child token of DetailAST root node which matches the given predicate.
static void	forEachChild(DetailAST root, int type, java.util.function.Consumer<DetailAST> action) Performs an action for each child of DetailAST root node which matches the given token type.
static int[]	getAllTokenIds() Get all token IDs that are available in TokenTypes.
static int	getIntFromField(java.lang.reflect.Field field, java.lang.Object object) Gets the value of a static or instance field of type int or of another primitive type convertible to type int via a widening conversion.
static java.lang.String	getShortDescription(java.lang.String name) Returns the short description of a token for a given name.
static int	getTokenId(java.lang.String name) Returns the ID of a token for a given name.
static java.lang.String	getTokenName(int id) Returns the name of a token for a given ID.
static int	getTokenTypesTotalNumber() Get total number of TokenTypes.
static java.util.Map<java.lang.Integer,java.lang.String>	invertMap(java.util.Map<java.lang.String,java.lang.Integer> map) Inverts a given map by exchanging each entry's key and value.
static boolean	isBooleanLiteralType(int tokenType) Checks if a token type is a literal true or false.
static boolean	isCommentType(int type) Is argument comment-related type (SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN, BLOCK_COMMENT_END, COMMENT_CONTENT).
static boolean	isCommentType(java.lang.String type) Is argument comment-related type name (SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN, BLOCK_COMMENT_END, COMMENT_CONTENT).
static boolean	isOfType(DetailAST ast, int... types) Determines if the AST belongs to the given types.
static boolean	isOfType(int type, int... types) Determines if the token type belongs to the given types.
static boolean	isRootNode(DetailAST ast) Determines if given AST is a root node, i.e.
static boolean	isTypeDeclaration(int type) Is type declaration token type (CLASS_DEF, INTERFACE_DEF, ANNOTATION_DEF, ENUM_DEF, RECORD_DEF).
static java.util.Map<java.lang.String,java.lang.Integer>	nameToValueMapFromPublicIntFields(java.lang.Class<?> cls) Creates a map of 'field name' to 'field value' from all public int fields of a class.

Methods inherited from class java.lang.Object

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

Field Detail

TOKEN_NAME_TO_VALUE

private static final java.util.Map<java.lang.String,java.lang.Integer> TOKEN_NAME_TO_VALUE

Maps from a token name to value.

TOKEN_VALUE_TO_NAME

private static final java.util.Map<java.lang.Integer,java.lang.String> TOKEN_VALUE_TO_NAME

Maps from a token value to name.

TOKEN_IDS

private static final int[] TOKEN_IDS

Array of all token IDs.

TOKEN_ID_EXCEPTION_FORMAT

private static final java.lang.String TOKEN_ID_EXCEPTION_FORMAT

Format for exception message when getting token by given id.

See Also:

Constant Field Values

TOKEN_NAME_EXCEPTION_FORMAT

private static final java.lang.String TOKEN_NAME_EXCEPTION_FORMAT

Format for exception message when getting token by given name.

See Also:

Constant Field Values

Constructor Detail

TokenUtil

private TokenUtil()

Stop instances being created.

Method Detail

getIntFromField

public static int getIntFromField(java.lang.reflect.Field field,
                                  java.lang.Object object)

Gets the value of a static or instance field of type int or of another primitive type convertible to type int via a widening conversion. Does not throw any checked exceptions.

Parameters:

field - from which the int should be extracted

object - to extract the int value from

Returns:

the value of the field converted to type int

Throws:

java.lang.IllegalStateException - if this Field object is enforcing Java language access control and the underlying field is inaccessible

See Also:

Field.getInt(Object)

nameToValueMapFromPublicIntFields

public static java.util.Map<java.lang.String,java.lang.Integer> nameToValueMapFromPublicIntFields(java.lang.Class<?> cls)

Creates a map of 'field name' to 'field value' from all public int fields of a class.

Parameters:

cls - source class

Returns:

unmodifiable name to value map

invertMap

public static java.util.Map<java.lang.Integer,java.lang.String> invertMap(java.util.Map<java.lang.String,java.lang.Integer> map)

Inverts a given map by exchanging each entry's key and value.

Parameters:

map - source map

Returns:

inverted map

getTokenTypesTotalNumber

public static int getTokenTypesTotalNumber()

Get total number of TokenTypes.

Returns:

total number of TokenTypes.

getAllTokenIds

public static int[] getAllTokenIds()

Get all token IDs that are available in TokenTypes.

Returns:

array of token IDs

getTokenName

public static java.lang.String getTokenName(int id)

Returns the name of a token for a given ID.

Parameters:

id - the ID of the token name to get

Returns:

a token name

Throws:

java.lang.IllegalArgumentException - when id is not valid

getTokenId

public static int getTokenId(java.lang.String name)

Returns the ID of a token for a given name.

Parameters:

name - the name of the token ID to get

Returns:

a token ID

Throws:

java.lang.IllegalArgumentException - when id is null

getShortDescription

public static java.lang.String getShortDescription(java.lang.String name)

Returns the short description of a token for a given name.

Parameters:

name - the name of the token ID to get

Returns:

a short description

Throws:

java.lang.IllegalArgumentException - when name is unknown

isCommentType

public static boolean isCommentType(int type)

Is argument comment-related type (SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN, BLOCK_COMMENT_END, COMMENT_CONTENT).

Parameters:

type - token type.

Returns:

true if type is comment-related type.

isCommentType

public static boolean isCommentType(java.lang.String type)

Is argument comment-related type name (SINGLE_LINE_COMMENT, BLOCK_COMMENT_BEGIN, BLOCK_COMMENT_END, COMMENT_CONTENT).

Parameters:

type - token type name.

Returns:

true if type is comment-related type name.

findFirstTokenByPredicate

public static java.util.Optional<DetailAST> findFirstTokenByPredicate(DetailAST root,
                                                                      java.util.function.Predicate<DetailAST> predicate)

Finds the first Optional child token of DetailAST root node which matches the given predicate.

Parameters:

root - root node.

predicate - predicate.

Returns:

Optional of DetailAST node which matches the predicate.

forEachChild

public static void forEachChild(DetailAST root,
                                int type,
                                java.util.function.Consumer<DetailAST> action)

Performs an action for each child of DetailAST root node which matches the given token type.

Parameters:

root - root node.

type - token type to match.

action - action to perform on the nodes.

areOnSameLine

public static boolean areOnSameLine(DetailAST ast1,
                                    DetailAST ast2)

Determines if two ASTs are on the same line.

Parameters:

ast1 - the first AST

ast2 - the second AST

Returns:

true if they are on the same line.

isTypeDeclaration

public static boolean isTypeDeclaration(int type)

Is type declaration token type (CLASS_DEF, INTERFACE_DEF, ANNOTATION_DEF, ENUM_DEF, RECORD_DEF).

Parameters:

type - token type.

Returns:

true if type is type declaration token type.

isOfType

public static boolean isOfType(int type,
                               int... types)

Determines if the token type belongs to the given types.

Parameters:

type - the Token Type to check

types - the acceptable types

Returns:

true if type matches one of the given types.

isOfType

public static boolean isOfType(DetailAST ast,
                               int... types)

Determines if the AST belongs to the given types.

Parameters:

ast - the AST node to check

types - the acceptable types

Returns:

true if type matches one of the given types.

isRootNode

public static boolean isRootNode(DetailAST ast)

Determines if given AST is a root node, i.e. if the type of the token we are checking is COMPILATION_UNIT.

Parameters:

ast - AST to check

Returns:

true if AST is a root node

isBooleanLiteralType

public static boolean isBooleanLiteralType(int tokenType)

Checks if a token type is a literal true or false.

Parameters:

tokenType - the TokenType

Returns:

true if tokenType is LITERAL_TRUE or LITERAL_FALSE