| java.lang.Object
 xtc.tree.Visitor
xtc.parser.GrammarVisitor
All known Subclasses: xtc.parser.PrefixFolder, xtc.parser.Tokenizer, xtc.parser.Renamer, xtc.parser.RootFinder, xtc.parser.ProductionVoider, xtc.parser.Inliner, xtc.parser.TerminalOptimizer, xtc.parser.ChoiceExpander, xtc.parser.DuplicateProductionFolder, xtc.parser.Simplifier, xtc.parser.TransientMarker, xtc.parser.DeadProductionEliminator, xtc.parser.GenericVoider, xtc.parser.ReferenceCounter,
| GrammarVisitor | | abstract public class GrammarVisitor extends Visitor (Code) | | The parent class of all grammar module visitors. This class
provides a skeleton visitor for processing
Grammar grammars and self-contained
Module modules , while maintaining a set
of useful flags.
author:
Robert Grimm
version:
$Revision: 1.24 $ |
| Field Summary | |
| final protected Analyzer | analyzer
The analyzer utility. | | protected boolean | isBound
Flag for whether the current element is bound. | | protected boolean | isLastElement
Flag for whether the current element is the last element of a
sequence. | | protected boolean | isPredicate
Flag for whether the current element is in a predicate. | | protected boolean | isRepeatedOnce
Flag for whether the current element is repeated at least once. | | protected boolean | isTopLevel
Flag for whether the current element is the top-level element of
a production. | | protected boolean | isVoided
Flag for whether the current element is voided. | | protected boolean | needsSequence
Flag for whether the parent element requires that the directly
embedded elements are sequences for
CodeGenerator codegeneration . | | final protected Runtime | runtime
The runtime. | | protected boolean | transformInPlace
Flag for whether to transform ordered choices, repetition, and
options in place, instead of creating a new production. |
| isBound | | protected boolean isBound(Code) | | Flag for whether the current element is bound.
|
| isLastElement | | protected boolean isLastElement(Code) | | Flag for whether the current element is the last element of a
sequence.
|
| isPredicate | | protected boolean isPredicate(Code) | | Flag for whether the current element is in a predicate.
|
| isRepeatedOnce | | protected boolean isRepeatedOnce(Code) | | Flag for whether the current element is repeated at least once.
|
| isTopLevel | | protected boolean isTopLevel(Code) | | Flag for whether the current element is the top-level element of
a production.
|
| isVoided | | protected boolean isVoided(Code) | | Flag for whether the current element is voided.
|
| needsSequence | | protected boolean needsSequence(Code) | | Flag for whether the parent element requires that the directly
embedded elements are sequences for
CodeGenerator codegeneration . It is used by the
Simplifier to avoid
stripping sequences that need to be restored later on again.
|
| transformInPlace | | protected boolean transformInPlace(Code) | | Flag for whether to transform ordered choices, repetition, and
options in place, instead of creating a new production. This
flag is used by the
Transformer.Lifter lifter visitor.
|
| GrammarVisitor | | public GrammarVisitor(Runtime runtime, Analyzer analyzer)(Code) | | Create a new grammar visitor.
Parameters:
runtime - The runtime.
Parameters:
analyzer - The analyzer utility. |
| visit | | public Element visit(Element e)(Code) | | Visit the specified element. This method provides the default
implementation for nonterminals, terminals (besides character
switches), node markers, actions, parse tree nodes, null
literals, and value elements.
|
|
|