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Java Source Code / Java Documentation » Parser » Rats Parser Generators » antlr

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Class Diagram

Java Document (Java Doc)

antlr .CppCodeGenerator

CppCodeGenerator
public class CppCodeGenerator extends CodeGenerator (Code)
	Generate MyParser.cpp, MyParser.hpp, MyLexer.cpp, MyLexer.hpp and MyParserTokenTypes.hpp

Field Summary
final protected static String	NONUNIQUE
int	astVarNumber
final public static int	caseSizeThreshold
String	commonExtraArgs
String	commonExtraParams
String	commonLocalVars
String	currentASTResult
RuleBlock	currentRule
HashSet	declaredASTVariables
String	exceptionThrown
protected boolean	genAST
protected boolean	genHashLines
String	labeledElementASTInit
String	labeledElementASTType
String	labeledElementInit
String	labeledElementType
String	lt1Value
protected boolean	noConstructors
protected String	outputFile
protected int	outputLine
protected boolean	saveText
protected int	syntacticPredLevel
String	throwNoViable
Hashtable	treeVariableMap
boolean	usingCustomAST

Constructor Summary
public	CppCodeGenerator() Create a C++ code-generator using the given Grammar.

Method Summary
protected void	_print(String s) Output a String to the currentOutput stream.
protected void	_printAction(String s) Print an action without leading tabs, attempting to preserve the current indentation level for multi-line actions Ignored if string is null.
protected void	_println(String s) Output a String followed by newline, to the currentOutput stream.
protected int	addSemPred(String predicate) Adds a semantic predicate string to the sem pred vector These strings will be used to build an array of sem pred names when building a debugging parser.
protected int	countLines(String s)
public void	exitIfError()
public void	gen()
public void	gen(ActionElement action) Generate code for the given grammar element.
public void	gen(AlternativeBlock blk) Generate code for the given grammar element.
public void	gen(BlockEndElement end) Generate code for the given grammar element. Parameters: blk - The block-end element to generate.
public void	gen(CharLiteralElement atom) Generate code for the given grammar element.
public void	gen(CharRangeElement r) Generate code for the given grammar element.
public void	gen(LexerGrammar g)
public void	gen(OneOrMoreBlock blk) Generate code for the given grammar element.
public void	gen(ParserGrammar g)
public void	gen(RuleRefElement rr) Generate code for the given grammar element.
public void	gen(StringLiteralElement atom) Generate code for the given grammar element.
public void	gen(TokenRangeElement r) Generate code for the given grammar element.
public void	gen(TokenRefElement atom) Generate code for the given grammar element.
public void	gen(TreeElement t)
public void	gen(TreeWalkerGrammar g)
public void	gen(WildcardElement wc) Generate code for the given grammar element.
public void	gen(ZeroOrMoreBlock blk) Generate code for the given grammar element.
protected void	genASTDeclaration(AlternativeElement el)
protected void	genASTDeclaration(AlternativeElement el, String node_type)
protected void	genASTDeclaration(AlternativeElement el, String var_name, String node_type)
protected void	genAlt(Alternative alt, AlternativeBlock blk) Generate an alternative.
protected void	genBitsets(Vector bitsetList, int maxVocabulary, String prefix) Generate all the bitsets to be used in the parser or lexer Generate the raw bitset data like "long _tokenSet1_data[] = {...};" and the BitSet object declarations like "BitSet _tokenSet1 = new BitSet(_tokenSet1_data);" Note that most languages do not support object initialization inside a class definition, so other code-generators may have to separate the bitset declarations from the initializations (e.g., put the initializations in the generated constructor instead).
protected void	genBitsetsHeader(Vector bitsetList, int maxVocabulary)
protected void	genBlockInitAction(AlternativeBlock blk) Generate the initaction for a block, which may be a RuleBlock or a plain AlternativeBLock.
protected void	genBlockPreamble(AlternativeBlock blk) Generate the header for a block, which may be a RuleBlock or a plain AlternativeBLock.
public void	genBody(LexerGrammar g)
public void	genBody(ParserGrammar g)
public void	genBody(TreeWalkerGrammar g)
protected void	genCases(BitSet p) Generate a series of case statements that implement a BitSet test.
public CppBlockFinishingInfo	genCommonBlock(AlternativeBlock blk, boolean noTestForSingle) Generate common code for a block of alternatives; return a postscript that needs to be generated at the end of the block.
protected void	genHeader(String fileName)
public void	genInclude(LexerGrammar g)
public void	genInclude(ParserGrammar g)
public void	genInclude(TreeWalkerGrammar g)
public void	genInitFactory(Grammar g)
public void	genLineNo(int line)
public void	genLineNo(GrammarElement el)
public void	genLineNo(Token t)
public void	genLineNo2()
protected void	genMatch(BitSet b)
protected void	genMatch(GrammarAtom atom)
protected void	genMatchUsingAtomText(GrammarAtom atom)
protected void	genMatchUsingAtomTokenType(GrammarAtom atom)
public void	genNextToken() Generate the nextToken() rule.
public void	genRule(RuleSymbol s, boolean startSymbol, int ruleNum, String prefix) Gen a named rule block.
public void	genRuleHeader(RuleSymbol s, boolean startSymbol)
protected void	genSemPred(String pred, int line)
protected void	genSemPredMap(String prefix) Write an array of Strings which are the semantic predicate expressions.
protected void	genSynPred(SynPredBlock blk, String lookaheadExpr)
public void	genTokenStrings(String prefix) Generate a static array containing the names of the tokens, indexed by the token type values.
protected void	genTokenTypes(TokenManager tm)
public String	getASTCreateString(Vector v) Get a string for an expression to generate creation of an AST subtree.
public String	getASTCreateString(GrammarAtom atom, String str)
public String	getASTCreateString(String str)
protected String	getLookaheadTestExpression(Lookahead[] look, int k)
protected String	getLookaheadTestExpression(Alternative alt, int maxDepth) Generate a lookahead test expression for an alternate.
protected String	getLookaheadTestTerm(int k, BitSet p) Generate a depth==1 lookahead test expression given the BitSet.
public String	getRangeExpression(int k, int[] elems) Return an expression for testing a contiguous renage of elements Parameters: k - The lookahead level Parameters: elems - The elements representing the set, usually from BitSet.toArray().
protected boolean	lookaheadIsEmpty(Alternative alt, int maxDepth)
public String	mapTreeId(String idParam, ActionTransInfo transInfo) Map an identifier to it's corresponding tree-node variable.
public void	printAction(Token t)
public void	printHeaderAction(String name)
protected void	println(String s) Output tab indent followed by a String followed by newline, to the currentOutput stream.
protected String	processActionForSpecialSymbols(String actionStr, int line, RuleBlock currentRule, ActionTransInfo tInfo) Lexically process tree-specifiers in the action.
public String	processStringForASTConstructor(String str) Process a string for an simple expression for use in xx/action.g it is used to cast simple tokens/references to the right type for the generated language.

Field Detail

NONUNIQUE
final protected static String NONUNIQUE(Code)

astVarNumber
int astVarNumber(Code)

caseSizeThreshold
final public static int caseSizeThreshold(Code)

commonExtraArgs
String commonExtraArgs(Code)

commonExtraParams
String commonExtraParams(Code)

commonLocalVars
String commonLocalVars(Code)

currentASTResult
String currentASTResult(Code)

currentRule
RuleBlock currentRule(Code)

declaredASTVariables
HashSet declaredASTVariables(Code)
	Used to keep track of which AST variables have been defined in a rule (except for the #rule_name and #rule_name_in var's

exceptionThrown
String exceptionThrown(Code)

genAST
protected boolean genAST(Code)

genHashLines
protected boolean genHashLines(Code)

labeledElementASTInit
String labeledElementASTInit(Code)

labeledElementASTType
String labeledElementASTType(Code)

labeledElementInit
String labeledElementInit(Code)

labeledElementType
String labeledElementType(Code)

lt1Value
String lt1Value(Code)

noConstructors
protected boolean noConstructors(Code)

outputFile
protected String outputFile(Code)

outputLine
protected int outputLine(Code)

saveText
protected boolean saveText(Code)

syntacticPredLevel
protected int syntacticPredLevel(Code)

throwNoViable
String throwNoViable(Code)

treeVariableMap
Hashtable treeVariableMap(Code)

usingCustomAST
boolean usingCustomAST(Code)

Constructor Detail

CppCodeGenerator
public CppCodeGenerator()(Code)
	Create a C++ code-generator using the given Grammar. The caller must still call setTool, setBehavior, and setAnalyzer before generating code.

Method Detail

_print
protected void _print(String s)(Code)
	Output a String to the currentOutput stream. Ignored if string is null. Parameters: s - The string to output

_printAction
protected void _printAction(String s)(Code)
	Print an action without leading tabs, attempting to preserve the current indentation level for multi-line actions Ignored if string is null. Parameters: s - The action string to output

_println
protected void _println(String s)(Code)
	Output a String followed by newline, to the currentOutput stream. Ignored if string is null. Parameters: s - The string to output

addSemPred
protected int addSemPred(String predicate)(Code)
	Adds a semantic predicate string to the sem pred vector These strings will be used to build an array of sem pred names when building a debugging parser. This method should only be called when the debug option is specified

countLines
protected int countLines(String s)(Code)

exitIfError
public void exitIfError()(Code)

gen
public void gen()(Code)
	Generate the parser, lexer, treeparser, and token types in C++

gen
public void gen(ActionElement action)(Code)
	Generate code for the given grammar element. Parameters: blk - The {...} action to generate

gen
public void gen(AlternativeBlock blk)(Code)
	Generate code for the given grammar element. Parameters: blk - The "x\|y\|z\|..." block to generate

gen
public void gen(BlockEndElement end)(Code)
	Generate code for the given grammar element. Parameters: blk - The block-end element to generate. Block-endelements are synthesized by the grammar parser to representthe end of a block.

gen
public void gen(CharLiteralElement atom)(Code)
	Generate code for the given grammar element. Parameters: blk - The character literal reference to generate

gen
public void gen(CharRangeElement r)(Code)
	Generate code for the given grammar element. Parameters: blk - The character-range reference to generate

gen
public void gen(LexerGrammar g) throws IOException(Code)
	Generate the lexer C++ files

gen
public void gen(OneOrMoreBlock blk)(Code)
	Generate code for the given grammar element. Parameters: blk - The (...)+ block to generate

gen
public void gen(ParserGrammar g) throws IOException(Code)
	Generate the parser C++ file

gen
public void gen(RuleRefElement rr)(Code)
	Generate code for the given grammar element. Parameters: blk - The rule-reference to generate

gen
public void gen(StringLiteralElement atom)(Code)
	Generate code for the given grammar element. Parameters: blk - The string-literal reference to generate

gen
public void gen(TokenRangeElement r)(Code)
	Generate code for the given grammar element. Parameters: blk - The token-range reference to generate

gen
public void gen(TokenRefElement atom)(Code)
	Generate code for the given grammar element. Parameters: blk - The token-reference to generate

gen
public void gen(TreeElement t)(Code)

gen
public void gen(TreeWalkerGrammar g) throws IOException(Code)
	Generate the tree-parser C++ files

gen
public void gen(WildcardElement wc)(Code)
	Generate code for the given grammar element. Parameters: wc - The wildcard element to generate

gen
public void gen(ZeroOrMoreBlock blk)(Code)
	Generate code for the given grammar element. Parameters: blk - The (...)* block to generate

genASTDeclaration
protected void genASTDeclaration(AlternativeElement el)(Code)

genASTDeclaration
protected void genASTDeclaration(AlternativeElement el, String node_type)(Code)

genASTDeclaration
protected void genASTDeclaration(AlternativeElement el, String var_name, String node_type)(Code)

genAlt
protected void genAlt(Alternative alt, AlternativeBlock blk)(Code)
	Generate an alternative. Parameters: alt - The alternative to generate Parameters: blk - The block to which the alternative belongs

genBitsets
protected void genBitsets(Vector bitsetList, int maxVocabulary, String prefix)(Code)
	Generate all the bitsets to be used in the parser or lexer Generate the raw bitset data like "long _tokenSet1_data[] = {...};" and the BitSet object declarations like "BitSet _tokenSet1 = new BitSet(_tokenSet1_data);" Note that most languages do not support object initialization inside a class definition, so other code-generators may have to separate the bitset declarations from the initializations (e.g., put the initializations in the generated constructor instead). Parameters: bitsetList - The list of bitsets to generate. Parameters: maxVocabulary - Ensure that each generated bitset can contain at least this value. Parameters: dumpSets - Dump out the token definitions of the contents of the bitsetonly for grammars/parsers.

genBitsetsHeader
protected void genBitsetsHeader(Vector bitsetList, int maxVocabulary)(Code)

genBlockInitAction
protected void genBlockInitAction(AlternativeBlock blk)(Code)
	Generate the initaction for a block, which may be a RuleBlock or a plain AlternativeBLock.

genBlockPreamble
protected void genBlockPreamble(AlternativeBlock blk)(Code)
	Generate the header for a block, which may be a RuleBlock or a plain AlternativeBLock. This generates any variable declarations and syntactic-predicate-testing variables.

genBody
public void genBody(LexerGrammar g) throws IOException(Code)

genBody
public void genBody(ParserGrammar g) throws IOException(Code)

genBody
public void genBody(TreeWalkerGrammar g) throws IOException(Code)

genCases
protected void genCases(BitSet p)(Code)
	Generate a series of case statements that implement a BitSet test. Parameters: p - The Bitset for which cases are to be generated

genCommonBlock
public CppBlockFinishingInfo genCommonBlock(AlternativeBlock blk, boolean noTestForSingle)(Code)
	Generate common code for a block of alternatives; return a postscript that needs to be generated at the end of the block. Other routines may append else-clauses and such for error checking before the postfix is generated. If the grammar is a lexer, then generate alternatives in an order where alternatives requiring deeper lookahead are generated first, and EOF in the lookahead set reduces the depth of the lookahead. Parameters: blk - The block to generate Parameters: noTestForSingle - If true, then it does not generate a test for a single alternative.

genHeader
protected void genHeader(String fileName)(Code)
	Generate a header that is common to all C++ files

genInclude
public void genInclude(LexerGrammar g) throws IOException(Code)

genInclude
public void genInclude(ParserGrammar g) throws IOException(Code)

genInclude
public void genInclude(TreeWalkerGrammar g) throws IOException(Code)

genInitFactory
public void genInitFactory(Grammar g)(Code)

genLineNo
public void genLineNo(int line)(Code)
	Generate a #line or // line depending on options

genLineNo
public void genLineNo(GrammarElement el)(Code)
	Generate a #line or // line depending on options

genLineNo
public void genLineNo(Token t)(Code)
	Generate a #line or // line depending on options

genLineNo2
public void genLineNo2()(Code)
	Generate a #line or // line depending on options

genMatch
protected void genMatch(BitSet b)(Code)

genMatch
protected void genMatch(GrammarAtom atom)(Code)

genMatchUsingAtomText
protected void genMatchUsingAtomText(GrammarAtom atom)(Code)

genMatchUsingAtomTokenType
protected void genMatchUsingAtomTokenType(GrammarAtom atom)(Code)

genNextToken
public void genNextToken()(Code)
	Generate the nextToken() rule. nextToken() is a synthetic lexer rule that is the implicit OR of all user-defined lexer rules. Parameters: RuleBlock -

genRule
public void genRule(RuleSymbol s, boolean startSymbol, int ruleNum, String prefix)(Code)
	Gen a named rule block. ASTs are generated for each element of an alternative unless the rule or the alternative have a '!' modifier. If an alternative defeats the default tree construction, it must set _AST to the root of the returned AST. Each alternative that does automatic tree construction, builds up root and child list pointers in an ASTPair structure. A rule finishes by setting the returnAST variable from the ASTPair. Parameters: rule - The name of the rule to generate Parameters: startSymbol - true if the rule is a start symbol (i.e., not referenced elsewhere)

genRuleHeader
public void genRuleHeader(RuleSymbol s, boolean startSymbol)(Code)

genSemPred
protected void genSemPred(String pred, int line)(Code)

genSemPredMap
protected void genSemPredMap(String prefix)(Code)
	Write an array of Strings which are the semantic predicate expressions. The debugger will reference them by number only

genSynPred
protected void genSynPred(SynPredBlock blk, String lookaheadExpr)(Code)

genTokenStrings
public void genTokenStrings(String prefix)(Code)
	Generate a static array containing the names of the tokens, indexed by the token type values. This static array is used to format error messages so that the token identifers or literal strings are displayed instead of the token numbers. If a lexical rule has a paraphrase, use it rather than the token label.

genTokenTypes
protected void genTokenTypes(TokenManager tm) throws IOException(Code)
	Generate the token types C++ file

getASTCreateString
public String getASTCreateString(Vector v)(Code)
	Get a string for an expression to generate creation of an AST subtree. Parameters: v - A Vector of String, where each element is an expressionin the target language yielding an AST node.

getASTCreateString
public String getASTCreateString(GrammarAtom atom, String str)(Code)
	Get a string for an expression to generate creating of an AST node Parameters: str - The arguments to the AST constructor

getASTCreateString
public String getASTCreateString(String str)(Code)
	Get a string for an expression to generate creating of an AST node Parameters: str - The arguments to the AST constructor

getLookaheadTestExpression
protected String getLookaheadTestExpression(Lookahead[] look, int k)(Code)

getLookaheadTestExpression
protected String getLookaheadTestExpression(Alternative alt, int maxDepth)(Code)
	Generate a lookahead test expression for an alternate. This will be a series of tests joined by '&&' and enclosed by '()', the number of such tests being determined by the depth of the lookahead.

getLookaheadTestTerm
protected String getLookaheadTestTerm(int k, BitSet p)(Code)
	Generate a depth==1 lookahead test expression given the BitSet. This may be one of: 1) a series of 'x==X\|\|' tests 2) a range test using >= && <= where possible, 3) a bitset membership test for complex comparisons Parameters: k - The lookahead level Parameters: p - The lookahead set for level k

getRangeExpression
public String getRangeExpression(int k, int[] elems)(Code)
	Return an expression for testing a contiguous renage of elements Parameters: k - The lookahead level Parameters: elems - The elements representing the set, usually from BitSet.toArray(). String containing test expression.

lookaheadIsEmpty
protected boolean lookaheadIsEmpty(Alternative alt, int maxDepth)(Code)
	Is the lookahead for this alt empty?

mapTreeId
public String mapTreeId(String idParam, ActionTransInfo transInfo)(Code)
	Map an identifier to it's corresponding tree-node variable. This is context-sensitive, depending on the rule and alternative being generated Parameters: idParam - The identifier name to map The mapped id (which may be the same as the input), or null if the mapping is invalid due to duplicates

printAction
public void printAction(Token t)(Code)
	Print an action stored in a token surrounded by #line stuff

printHeaderAction
public void printHeaderAction(String name)(Code)
	Print a header action by #line stuff also process any tree construction Parameters: name - The name of the header part

println
protected void println(String s)(Code)
	Output tab indent followed by a String followed by newline, to the currentOutput stream. Ignored if string is null. Parameters: s - The string to output

processActionForSpecialSymbols
protected String processActionForSpecialSymbols(String actionStr, int line, RuleBlock currentRule, ActionTransInfo tInfo)(Code)
	Lexically process tree-specifiers in the action. This will replace #id and #(...) with the appropriate function calls and/or variables.

processStringForASTConstructor
public String processStringForASTConstructor(String str)(Code)
	Process a string for an simple expression for use in xx/action.g it is used to cast simple tokens/references to the right type for the generated language. Basically called for every element in the vector to getASTCreateString(vector V) Parameters: str - A String.

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