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| java.lang.Object
 xtc.tree.Visitor
xtc.parser.TreeExtractor
| TreeExtractor | | public class TreeExtractor extends Visitor (Code) | | Visitor to pear down a grammar to the structure of its abstract
syntax tree. This visitor assumes that the entire grammar is
contained in a single module. It also assumes that directly
left-recursive generic productions have not been
transformed by
DirectLeftRecurser . Note that, after this
visitor has processed the grammar, the grammar violates the code
generator's requirements. Also note that this visitor internally
uses
Simplifier and
DeadProductionEliminator .
author:
Robert Grimm
version:
$Revision: 1.11 $ |
| Field Summary | |
| final protected Analyzer | analyzer
The analyzer utility. | | final protected AST | ast
The common type operations. | | protected boolean | isGeneric
The flag for whether the current production is generic. | | protected boolean | isList
The flag for whether the current production is list-valued. | | protected boolean | isTextOnly
The flag for whether the current production is text-only. | | protected boolean | isToken
The flag for whether the current production is token-level. | | final protected boolean | keepLexical
The flag for removing all elements from lexical productions. | | final protected Runtime | runtime
The runtime. | | protected boolean | setsValue
The flag for whether the current production defines the semantic
value in an explicit action. |
| ast | | final protected AST ast(Code) | | The common type operations.
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| isGeneric | | protected boolean isGeneric(Code) | | The flag for whether the current production is generic.
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| isList | | protected boolean isList(Code) | | The flag for whether the current production is list-valued.
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| isTextOnly | | protected boolean isTextOnly(Code) | | The flag for whether the current production is text-only.
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| isToken | | protected boolean isToken(Code) | | The flag for whether the current production is token-level.
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| keepLexical | | final protected boolean keepLexical(Code) | | The flag for removing all elements from lexical productions.
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| setsValue | | protected boolean setsValue(Code) | | The flag for whether the current production defines the semantic
value in an explicit action.
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| TreeExtractor | | public TreeExtractor(Runtime runtime, Analyzer analyzer, AST ast, boolean keepLexical)(Code) | | Create a new tree extractor.
Parameters:
runtime - The runtime.
Parameters:
analyzer - The analyzer utility.
Parameters:
ast - The type operations.
Parameters:
keepLexical - The flag for keeping elements of text-onlyor token-level productions. |
| visit | | public void visit(Module m)(Code) | | Visit the specified module.
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| visit | | public void visit(Sequence s)(Code) | | Visit the specified sequence.
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| visit | | public void visit(CharCase c)(Code) | | Visit the specified character case.
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| visit | | public void visit(CharSwitch s)(Code) | | Visit the specified character switch.
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| visit | | public void visit(Element e)(Code) | | Visit the specified element.
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