Package com.puppycrawl.tools.checkstyle.checks.indentation

Class AbstractExpressionHandler

java.lang.Object

com.puppycrawl.tools.checkstyle.checks.indentation.AbstractExpressionHandler

Direct Known Subclasses:

BlockParentHandler, CaseHandler, ImportHandler, IndexHandler, LabelHandler, LambdaHandler, MemberDefHandler, MethodCallHandler, NewHandler, PackageDefHandler, PrimordialHandler, SwitchRuleHandler, YieldHandler

public abstract class AbstractExpressionHandler
extends Object

Abstract base class for all handlers.

Field Summary

Fields

Modifier and Type	Field	Description
private IndentLevel	indent	Indentation amount for this handler.
private IndentationCheck	indentCheck	The instance of IndentationCheck using this handler.
private DetailAST	mainAst	The AST which is handled by this handler.
private AbstractExpressionHandler	parent	Containing AST handler.
private String	typeName	Name used during output to user.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractExpressionHandler(IndentationCheck indentCheck, String typeName, DetailAST expr, AbstractExpressionHandler parent)	Construct an instance of this handler with the given indentation check, name, abstract syntax tree, and parent handler.

Method Summary

Modifier and Type	Method	Description
protected void	checkChildren(DetailAST parentNode, int[] tokenTypes, IndentLevel startIndent, boolean firstLineMatches, boolean allowNesting)	Check the indent level of the children of the specified parent expression.
protected void	checkExpressionSubtree(DetailAST tree, IndentLevel indentLevel, boolean firstLineMatches, boolean allowNesting)	Check the indentation level for an expression subtree.
abstract void	checkIndentation()	Check the indentation of the expression we are handling.
protected void	checkLeftParen(DetailAST lparen)	Check the indentation of the left parenthesis.
private void	checkLineIndent(DetailAST ast, IndentLevel indentLevel, boolean mustMatch)	Check the indentation for a single-line.
private void	checkLinesIndent(DetailAstSet astSet, IndentLevel indentLevel, boolean firstLineMatches, int firstLine, boolean allowNesting)	Check the indentation for a set of lines.
protected void	checkModifiers()	Check the indentation level of modifiers.
protected void	checkRightParen(DetailAST lparen, DetailAST rparen)	Check the indentation of the right parenthesis.
protected void	checkWrappingIndentation(DetailAST firstNode, DetailAST lastNode)	Checks indentation on wrapped lines between and including firstNode and lastNode.
protected void	checkWrappingIndentation(DetailAST firstNode, DetailAST lastNode, int wrappedIndentLevel, int startIndent, boolean ignoreFirstLine)	Checks indentation on wrapped lines between and including firstNode and lastNode.
protected int	expandedTabsColumnNo(DetailAST ast)	Get the column number for the start of a given expression, expanding tabs out into spaces in the process.
protected void	findSubtreeAst(DetailAstSet astSet, DetailAST tree, boolean allowNesting)	Find the set of abstract syntax tree for a given subtree.
protected int	getBasicOffset()	A shortcut for IndentationCheck property.
protected int	getBraceAdjustment()	A shortcut for IndentationCheck property.
protected static DetailAST	getFirstAstNode(DetailAST ast)	Get the first ast for given expression.
protected static int	getFirstLine(DetailAST tree)	Get the first line number for given expression.
static DetailAST	getFirstToken(DetailAST ast)	Searches in given subtree (including given node) for the token which represents first symbol for this subtree in file.
IndentLevel	getIndent()	Get the indentation amount for this handler.
protected IndentationCheck	getIndentCheck()	Accessor for the IndentCheck attribute.
protected IndentLevel	getIndentImpl()	Compute the indentation amount for this handler.
protected int	getLineStart(int lineNo)	Get the start of the line for the given line number.
protected int	getLineStart(DetailAST ast)	Get the start of the line for the given expression.
private int	getLineStart(String line)	Get the start of the specified line.
protected DetailAST	getMainAst()	Accessor for the MainAst attribute.
protected AbstractExpressionHandler	getParent()	Accessor for the Parent attribute.
IndentLevel	getSuggestedChildIndent(AbstractExpressionHandler child)	Indentation level suggested for a child element.
protected boolean	isOnStartOfLine(DetailAST ast)	Determines if the given expression is at the start of a line.
private void	logChildError(DetailAST ast, int actualIndent, IndentLevel expectedIndent)	Log child indentation error.
protected void	logError(DetailAST ast, String subtypeName, int actualIndent)	Log an indentation error.
protected void	logError(DetailAST ast, String subtypeName, int actualIndent, IndentLevel expectedIndent)	Log an indentation error.
protected boolean	shouldIncreaseIndent()	Checks that indentation should be increased after first line in checkLinesIndent().

Methods inherited from class java.lang.Object

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

Field Detail

indentCheck

private final IndentationCheck indentCheck

The instance of IndentationCheck using this handler.

mainAst

private final DetailAST mainAst

The AST which is handled by this handler.

typeName

private final String typeName

Name used during output to user.

parent

private final AbstractExpressionHandler parent

Containing AST handler.

indent

private IndentLevel indent

Indentation amount for this handler.

Constructor Detail

AbstractExpressionHandler

protected AbstractExpressionHandler(IndentationCheck indentCheck,
                                    String typeName,
                                    DetailAST expr,
                                    AbstractExpressionHandler parent)

Construct an instance of this handler with the given indentation check, name, abstract syntax tree, and parent handler.

Parameters:

indentCheck - the indentation check

typeName - the name of the handler

expr - the abstract syntax tree

parent - the parent handler

Method Detail

checkIndentation

public abstract void checkIndentation()

Check the indentation of the expression we are handling.

getIndent

public final IndentLevel getIndent()

Get the indentation amount for this handler. For performance reasons, this value is cached. The first time this method is called, the indentation amount is computed and stored. On further calls, the stored value is returned.

Returns:

the expected indentation amount

getIndentImpl

protected IndentLevel getIndentImpl()

Compute the indentation amount for this handler.

Returns:

the expected indentation amount

getSuggestedChildIndent

public IndentLevel getSuggestedChildIndent(AbstractExpressionHandler child)

Indentation level suggested for a child element. Children don't have to respect this, but most do.

Parameters:

child - child AST (so suggestion level can differ based on child type)

Returns:

suggested indentation for child

logError

protected final void logError(DetailAST ast,
                              String subtypeName,
                              int actualIndent)

Log an indentation error.

Parameters:

ast - the expression that caused the error

subtypeName - the type of the expression

actualIndent - the actual indent level of the expression

logError

protected final void logError(DetailAST ast,
                              String subtypeName,
                              int actualIndent,
                              IndentLevel expectedIndent)

Log an indentation error.

Parameters:

ast - the expression that caused the error

subtypeName - the type of the expression

actualIndent - the actual indent level of the expression

expectedIndent - the expected indent level of the expression

logChildError

private void logChildError(DetailAST ast,
                           int actualIndent,
                           IndentLevel expectedIndent)

Log child indentation error.

Parameters:

ast - the abstract syntax tree that causes the error

actualIndent - the actual indent level of the expression

expectedIndent - the expected indent level of the expression

isOnStartOfLine

protected final boolean isOnStartOfLine(DetailAST ast)

Determines if the given expression is at the start of a line.

Parameters:

ast - the expression to check

Returns:

true if it is, false otherwise

getFirstToken

public static DetailAST getFirstToken(DetailAST ast)

Searches in given subtree (including given node) for the token which represents first symbol for this subtree in file.

Parameters:

ast - a root of subtree in which the search should be performed.

Returns:

a token which occurs first in the file.

getLineStart

protected final int getLineStart(DetailAST ast)

Get the start of the line for the given expression.

Parameters:

ast - the expression to find the start of the line for

Returns:

the start of the line for the given expression

getLineStart

protected final int getLineStart(int lineNo)

Get the start of the line for the given line number.

Parameters:

lineNo - the line number to find the start for

Returns:

the start of the line for the given expression

getLineStart

private int getLineStart(String line)

Get the start of the specified line.

Parameters:

line - the specified line number

Returns:

the start of the specified line

shouldIncreaseIndent

protected boolean shouldIncreaseIndent()

Checks that indentation should be increased after first line in checkLinesIndent().

Returns:

true if indentation should be increased after first line in checkLinesIndent() false otherwise

checkLinesIndent

private void checkLinesIndent(DetailAstSet astSet,
                              IndentLevel indentLevel,
                              boolean firstLineMatches,
                              int firstLine,
                              boolean allowNesting)

Check the indentation for a set of lines.

Parameters:

astSet - the set of abstract syntax tree to check

indentLevel - the indentation level

firstLineMatches - whether or not the first line has to match

firstLine - first line of whole expression

allowNesting - whether or not subtree nesting is allowed

checkLineIndent

private void checkLineIndent(DetailAST ast,
                             IndentLevel indentLevel,
                             boolean mustMatch)

Check the indentation for a single-line.

Parameters:

ast - the abstract syntax tree to check

indentLevel - the indentation level

mustMatch - whether or not the indentation level must match

checkWrappingIndentation

protected void checkWrappingIndentation(DetailAST firstNode,
                                        DetailAST lastNode)

Checks indentation on wrapped lines between and including firstNode and lastNode.

Parameters:

firstNode - First node to start examining.

lastNode - Last node to examine inclusively.

checkWrappingIndentation

protected void checkWrappingIndentation(DetailAST firstNode,
                                        DetailAST lastNode,
                                        int wrappedIndentLevel,
                                        int startIndent,
                                        boolean ignoreFirstLine)

Checks indentation on wrapped lines between and including firstNode and lastNode.

Parameters:

firstNode - First node to start examining.

lastNode - Last node to examine inclusively.

wrappedIndentLevel - Indentation all wrapped lines should use.

startIndent - Indentation first line before wrapped lines used.

ignoreFirstLine - Test if first line's indentation should be checked or not.

checkChildren

protected final void checkChildren(DetailAST parentNode,
                                   int[] tokenTypes,
                                   IndentLevel startIndent,
                                   boolean firstLineMatches,
                                   boolean allowNesting)

Check the indent level of the children of the specified parent expression.

Parameters:

parentNode - the parent whose children we are checking

tokenTypes - the token types to check

startIndent - the starting indent level

firstLineMatches - whether or not the first line needs to match

allowNesting - whether or not nested children are allowed

checkExpressionSubtree

protected final void checkExpressionSubtree(DetailAST tree,
                                            IndentLevel indentLevel,
                                            boolean firstLineMatches,
                                            boolean allowNesting)

Check the indentation level for an expression subtree.

Parameters:

tree - the expression subtree to check

indentLevel - the indentation level

firstLineMatches - whether or not the first line has to match

allowNesting - whether or not subtree nesting is allowed

getFirstLine

protected static int getFirstLine(DetailAST tree)

Get the first line number for given expression.

Parameters:

tree - the expression to find the first line for

Returns:

the first line of expression

getFirstAstNode

protected static DetailAST getFirstAstNode(DetailAST ast)

Get the first ast for given expression.

Parameters:

ast - the abstract syntax tree for which the starting ast is to be found

Returns:

the first ast of the expression

expandedTabsColumnNo

protected final int expandedTabsColumnNo(DetailAST ast)

Get the column number for the start of a given expression, expanding tabs out into spaces in the process.

Parameters:

ast - the expression to find the start of

Returns:

the column number for the start of the expression

findSubtreeAst

protected final void findSubtreeAst(DetailAstSet astSet,
                                    DetailAST tree,
                                    boolean allowNesting)

Find the set of abstract syntax tree for a given subtree.

Parameters:

astSet - the set of ast to add

tree - the subtree to examine

allowNesting - whether or not to allow nested subtrees

checkModifiers

protected void checkModifiers()

Check the indentation level of modifiers.

getIndentCheck

protected final IndentationCheck getIndentCheck()

Accessor for the IndentCheck attribute.

Returns:

the IndentCheck attribute

getMainAst

protected final DetailAST getMainAst()

Accessor for the MainAst attribute.

Returns:

the MainAst attribute

getParent

protected final AbstractExpressionHandler getParent()

Accessor for the Parent attribute.

Returns:

the Parent attribute

getBasicOffset

protected final int getBasicOffset()

A shortcut for IndentationCheck property.

Returns:

value of basicOffset property of IndentationCheck

getBraceAdjustment

protected final int getBraceAdjustment()

A shortcut for IndentationCheck property.

Returns:

value of braceAdjustment property of IndentationCheck

checkRightParen

protected final void checkRightParen(DetailAST lparen,
                                     DetailAST rparen)

Check the indentation of the right parenthesis.

Parameters:

lparen - left parenthesis associated with aRparen

rparen - parenthesis to check

checkLeftParen

protected final void checkLeftParen(DetailAST lparen)

Check the indentation of the left parenthesis.

Parameters:

lparen - parenthesis to check