Package eu.bandm.tools.d2d2.base

Class StackPrinter.FollowSet

java.lang.Object

eu.bandm.tools.umod.runtime.OptimizingVisitor

eu.bandm.tools.d2d2.rt.MATCH_ONLY_00

eu.bandm.tools.d2d2.rt.SinglePhase_rt

eu.bandm.tools.d2d2.base.StackPrinter.FollowSet

Enclosing class:

StackPrinter

protected static class StackPrinter.FollowSet
extends SinglePhase_rt

Single-use tool to find all sub-expressions of the current content model which are allowed to enter as next input in the current parsing situation. Operates for a certain State_singleton, which represents an element definition and its contents model. The total parsing state is realized by the stack frames "above" this State_singleton: (a) by index positions in a State_sequ, (b) by the "check list" in a State_perm. The collected set is used for highlighting in error message stack frame prints. It can be used to show the correct alternatives to some erroneous input.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected class	StackPrinter.FollowSet.ExprAnalyse	Put all reached references into the global set result and stop after a non-epsilon sequence element.
protected class	StackPrinter.FollowSet.NoMoreEpsilon	Is thrown to signal the end of the search for possible input tags in a sequence state.

Nested classes/interfaces inherited from class eu.bandm.tools.umod.runtime.OptimizingVisitor

OptimizingVisitor.DataByName

Field Summary

Fields

Modifier and Type	Field	Description
static final Set<Expression>	empty	Empty result set
static final Reference	epsilonRefence	Pseudo-reference to mark empty content.
protected Set<Expression>	result	The result to return.

Fields inherited from class eu.bandm.tools.d2d2.rt.MATCH_ONLY_00

_visitor_debug_stream, partial

Fields inherited from class eu.bandm.tools.umod.runtime.OptimizingVisitor

affectedClasses, fieldFlags, hasdescend, haspost, haspre, methodname_action, METHODNAME_allFields2codeNumber, METHODNAMEPREFIX_DESCEND, SUFFIX_FILENAME_SCC_DATA

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	FollowSet()

Method Summary

Modifier and Type	Method	Description
void	action(State_perm permstate)	Extract all first-tags of all sub-expresions, which have not been used yet.
void	action(State_rep state)	Add the allowed input for this parsing state to the result set.
void	action(State_sequ state)	Extract all first-tags of the suffix of the sequence, starting after the current position.
Set<Expression>	calculate(State state)	Central service method: calculate the result.

Methods inherited from class eu.bandm.tools.d2d2.rt.SinglePhase_rt

action, action, action, action, action, action, action, action, action, action, action, action, collectFlags, follow_assoc, follow_consumed, follow_obligates, follow_sequ, follow_subs, follow_subs, getKey, getLowestGeneratedClass

Methods inherited from class eu.bandm.tools.d2d2.rt.MATCH_ONLY_00

_visitor_trace, action, action, action, action, action, action, action, action, action, action, action, allFields2codeNumber, compile, followAll_assoc, followAll_consumed, followAll_obligates, followAll_sequ, followAll_subs, followAll_subs, foreignObject, get_class2reachedSccs, get_class2scc, get_field2sccs, match, match, match, match, match, match, match, match, match, match, match, match, match, match, match, match, nomatch

Methods inherited from class eu.bandm.tools.umod.runtime.OptimizingVisitor

calculateFlags, collectFlags_action, collectFlags_actionPreDescendPost, collectFlags_actionRewritefields, collectMethods, readSccData

Methods inherited from class java.lang.Object

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

Field Details

result

protected Set<Expression> result

The result to return.

epsilonRefence

public static final Reference epsilonRefence

Pseudo-reference to mark empty content.

empty

public static final Set<Expression> empty

Empty result set

Constructor Details

FollowSet

protected FollowSet()

Method Details

calculate

public Set<Expression> calculate(State state)

Central service method: calculate the result.

action

public void action(State_rep state)

Add the allowed input for this parsing state to the result set.

Overrides:

action in class SinglePhase_rt

action

public void action(State_sequ state)

Extract all first-tags of the suffix of the sequence, starting after the current position.

Overrides:

action in class SinglePhase_rt

action

public void action(State_perm permstate)

Extract all first-tags of all sub-expresions, which have not been used yet.

Overrides:

action in class SinglePhase_rt