gnu.expr
Class ExpWalker

java.lang.Object
  gnu.expr.ExpWalker

All Implemented Interfaces:

SourceLocator, org.xml.sax.Locator

Direct Known Subclasses:

ChainLambdas, FindCapturedVars, FindTailCalls, InlineCalls, PushApply, ResolveNames

public class ExpWalker
extends java.lang.Object
implements SourceLocator

Class for doing a tree-walk over an Expression tree.

Field Summary

protected LambdaExp	currentLambda
protected SourceMessages	messages

Constructor Summary

ExpWalker()

Method Summary

void	error(char kind, java.lang.String message)
int	getColumnNumber() Return current column number.
Compilation	getCompilation() Get the Compilation associated with this walker.
LambdaExp	getCurrentLambda()
java.lang.String	getFileName() Normally same as getSystemId.
int	getLineNumber() Return current line number.
SourceMessages	getMessages()
java.lang.String	getPublicId()
java.lang.String	getSystemId()
boolean	isStableSourceLocation() Normally same as getSystemId.
Expression	noteError(java.lang.String message)
void	setColumn(int column)
void	setContext(Compilation comp)
void	setFile(java.lang.String filename)
void	setLine(int line)
void	setLine(java.lang.String filename, int line, int column)
Expression	walk(Expression exp) Call the walk method of argument Expression.
protected Expression	walkApplyExp(ApplyExp exp)
protected Expression	walkBeginExp(BeginExp exp)
protected Expression	walkBlockExp(BlockExp exp)
protected Expression	walkClassExp(ClassExp exp)
protected void	walkDeclarationType(Declaration decl)
protected void	walkDeclarationTypes(ScopeExp exp)
void	walkDefaultArgs(LambdaExp exp)
protected Expression	walkExitExp(ExitExp exp)
protected Expression	walkExpression(Expression exp)
Expression[]	walkExps(Expression[] exps)
Expression[]	walkExps(Expression[] exps, int n) Call walk on the Expressions in an array.
protected Expression	walkFluidLetExp(FluidLetExp exp)
protected Expression	walkIfExp(IfExp exp)
protected Expression	walkLambdaExp(LambdaExp exp)
protected Expression	walkLangExp(LangExp exp)
protected Expression	walkLetExp(LetExp exp)
protected Expression	walkModuleExp(ModuleExp exp)
protected Expression	walkObjectExp(ObjectExp exp)
protected Expression	walkQuoteExp(QuoteExp exp)
protected Expression	walkReferenceExp(ReferenceExp exp)
protected Expression	walkScopeExp(ScopeExp exp)
protected Expression	walkSetExp(SetExp exp)
protected Expression	walkSynchronizedExp(SynchronizedExp exp)
protected Expression	walkThisExp(ThisExp exp)
protected Expression	walkTryExp(TryExp exp)

Methods inherited from class java.lang.Object

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

Field Detail

messages

protected SourceMessages messages

currentLambda

protected LambdaExp currentLambda

Constructor Detail

ExpWalker

public ExpWalker()

Method Detail

getCompilation

public Compilation getCompilation()

Get the Compilation associated with this walker.

getMessages

public SourceMessages getMessages()

walkExpression

protected Expression walkExpression(Expression exp)

setContext

public void setContext(Compilation comp)

walk

public Expression walk(Expression exp)

Call the walk method of argument Expression. Could call Expression's walk directly, but this allows us to interpose a method call on each Expression. We use it to note the Expression's line number. Should not need to be overridden; if you do, you may also want to override walkExps.

walkApplyExp

protected Expression walkApplyExp(ApplyExp exp)

walkIfExp

protected Expression walkIfExp(IfExp exp)

walkDeclarationType

protected final void walkDeclarationType(Declaration decl)

walkDeclarationTypes

protected final void walkDeclarationTypes(ScopeExp exp)

walkScopeExp

protected Expression walkScopeExp(ScopeExp exp)

walkLetExp

protected Expression walkLetExp(LetExp exp)

walkLambdaExp

protected Expression walkLambdaExp(LambdaExp exp)

walkClassExp

protected Expression walkClassExp(ClassExp exp)

walkObjectExp

protected Expression walkObjectExp(ObjectExp exp)

walkModuleExp

protected Expression walkModuleExp(ModuleExp exp)

walkSetExp

protected Expression walkSetExp(SetExp exp)

walkTryExp

protected Expression walkTryExp(TryExp exp)

walkBeginExp

protected Expression walkBeginExp(BeginExp exp)

walkQuoteExp

protected Expression walkQuoteExp(QuoteExp exp)

walkReferenceExp

protected Expression walkReferenceExp(ReferenceExp exp)

walkThisExp

protected Expression walkThisExp(ThisExp exp)

walkSynchronizedExp

protected Expression walkSynchronizedExp(SynchronizedExp exp)

walkBlockExp

protected Expression walkBlockExp(BlockExp exp)

walkExitExp

protected Expression walkExitExp(ExitExp exp)

walkFluidLetExp

protected Expression walkFluidLetExp(FluidLetExp exp)

walkLangExp

protected Expression walkLangExp(LangExp exp)

getCurrentLambda

public final LambdaExp getCurrentLambda()

walkExps

public Expression[] walkExps(Expression[] exps)

walkExps

public Expression[] walkExps(Expression[] exps,
                             int n)

Call walk on the Expressions in an array. However, the walk method is inlined for speed.

walkDefaultArgs

public void walkDefaultArgs(LambdaExp exp)

error

public void error(char kind,
                  java.lang.String message)

noteError

public Expression noteError(java.lang.String message)

getFileName

public final java.lang.String getFileName()

Description copied from interface: SourceLocator

Normally same as getSystemId.

Specified by:

getFileName in interface SourceLocator

getLineNumber

public final int getLineNumber()

Description copied from interface: SourceLocator

Return current line number. The "first" line is line 1; unknown is -1.

Specified by:

getLineNumber in interface SourceLocator

Specified by:

getLineNumber in interface org.xml.sax.Locator

getColumnNumber

public final int getColumnNumber()

Description copied from interface: SourceLocator

Return current column number. The "first" column is column 1; unknown is -1.

Specified by:

getColumnNumber in interface SourceLocator

Specified by:

getColumnNumber in interface org.xml.sax.Locator

getPublicId

public java.lang.String getPublicId()

Specified by:

getPublicId in interface SourceLocator

Specified by:

getPublicId in interface org.xml.sax.Locator

getSystemId

public java.lang.String getSystemId()

Specified by:

getSystemId in interface SourceLocator

Specified by:

getSystemId in interface org.xml.sax.Locator

isStableSourceLocation

public boolean isStableSourceLocation()

Normally same as getSystemId.

Specified by:

isStableSourceLocation in interface SourceLocator

setFile

public void setFile(java.lang.String filename)

setLine

public void setLine(int line)

setColumn

public void setColumn(int column)

setLine

public void setLine(java.lang.String filename,
                    int line,
                    int column)