Package antlr

Class CSharpCodeGenerator


  • public class CSharpCodeGenerator
    extends CodeGenerator
    Generates MyParser.cs, MyLexer.cs and MyParserTokenTypes.cs
    • Field Detail

      • syntacticPredLevel

        protected int syntacticPredLevel
      • genAST

        protected boolean genAST
      • saveText

        protected boolean saveText
      • usingCustomAST

        boolean usingCustomAST
      • labeledElementType

        String labeledElementType
      • labeledElementASTType

        String labeledElementASTType
      • labeledElementInit

        String labeledElementInit
      • commonExtraArgs

        String commonExtraArgs
      • commonExtraParams

        String commonExtraParams
      • commonLocalVars

        String commonLocalVars
      • exceptionThrown

        String exceptionThrown
      • throwNoViable

        String throwNoViable
      • currentASTResult

        String currentASTResult
      • treeVariableMap

        Hashtable treeVariableMap
        Mapping between the ids used in the current alt, and the names of variables used to represent their AST values.
      • declaredASTVariables

        Hashtable declaredASTVariables
        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
      • astVarNumber

        int astVarNumber
      • NONUNIQUE

        protected static final String NONUNIQUE
        Special value used to mark duplicate in treeVariableMap
      • saveIndexCreateLevel

        int saveIndexCreateLevel
      • blockNestingLevel

        int blockNestingLevel
    • Constructor Detail

      • CSharpCodeGenerator

        public CSharpCodeGenerator()
        Create a CSharp code-generator using the given Grammar. The caller must still call setTool, setBehavior, and setAnalyzer before generating code.
    • Method Detail

      • addSemPred

        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. This method should only be called when the debug option is specified
      • exitIfError

        public void exitIfError()
      • gen

        public void gen()
        Generate the parser, lexer, treeparser, and token types in CSharp
        Specified by:
        gen in class CodeGenerator
      • gen

        public void gen​(ActionElement action)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The {...} action to generate
      • gen

        public void gen​(AlternativeBlock blk)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The "x|y|z|..." block to generate
      • gen

        public void gen​(BlockEndElement end)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The block-end element to generate. Block-end elements are synthesized by the grammar parser to represent the end of a block.
      • gen

        public void gen​(CharLiteralElement atom)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The character literal reference to generate
      • gen

        public void gen​(CharRangeElement r)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The character-range reference to generate
      • gen

        public void gen​(OneOrMoreBlock blk)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The (...)+ block to generate
      • gen

        public void gen​(RuleRefElement rr)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The rule-reference to generate
      • gen

        public void gen​(StringLiteralElement atom)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The string-literal reference to generate
      • gen

        public void gen​(TokenRangeElement r)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The token-range reference to generate
      • gen

        public void gen​(TokenRefElement atom)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The token-reference to generate
      • gen

        public void gen​(WildcardElement wc)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        wc - The wildcard element to generate
      • gen

        public void gen​(ZeroOrMoreBlock blk)
        Generate code for the given grammar element.
        Specified by:
        gen in class CodeGenerator
        Parameters:
        blk - The (...)* block to generate
      • genAlt

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

        protected void genBitsets​(Vector bitsetList,
                                  int maxVocabulary)
        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.
        maxVocabulary - Ensure that each generated bitset can contain at least this value.
      • getBitsetName

        protected String getBitsetName​(int index)
        Given the index of a bitset in the bitset list, generate a unique name. Specific code-generators may want to override this if the language does not allow '_' or numerals in identifiers.
        Overrides:
        getBitsetName in class CodeGenerator
        Parameters:
        index - The index of the bitset in the bitset list.
      • genBlockInitAction

        protected void genBlockInitAction​(AlternativeBlock blk)
        Generate the init action for a block, which may be a RuleBlock or a plain AlternativeBLock.
      • genBlockPreamble

        protected void genBlockPreamble​(AlternativeBlock blk)
        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.
      • genInitFactory

        public void genInitFactory​(Grammar g)
      • genCases

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

        public CSharpBlockFinishingInfo 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. 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. @param blk The block to generate @param noTestForSingle If true, then it does not generate a test for a single alternative.
      • genHeader

        protected void genHeader()
        Generate a header that is common to all CSharp files
      • genMatch

        protected void genMatch​(BitSet b)
      • genMatch

        protected void genMatch​(GrammarAtom atom)
      • genMatchUsingAtomText

        protected void genMatchUsingAtomText​(GrammarAtom atom)
      • genMatchUsingAtomTokenType

        protected void genMatchUsingAtomTokenType​(GrammarAtom atom)
      • genNextToken

        public void genNextToken()
        Generate the nextToken() rule. nextToken() is a synthetic lexer rule that is the implicit OR of all user-defined lexer rules.
      • genRule

        public void genRule​(RuleSymbol s,
                            boolean startSymbol,
                            int ruleNum,
                            TokenManager tm)
        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
        startSymbol - true if the rule is a start symbol (i.e., not referenced elsewhere)
      • genSemPred

        protected void genSemPred​(String pred,
                                  int line)
      • genSemPredMap

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

        public void genTokenStrings()
        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.
      • processStringForASTConstructor

        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. Basically called for every element in the vector to getASTCreateString(vector V)
        Overrides:
        processStringForASTConstructor in class CodeGenerator
        Parameters:
        str - A String.
      • getASTCreateString

        public String getASTCreateString​(Vector v)
        Get a string for an expression to generate creation of an AST subtree.
        Specified by:
        getASTCreateString in class CodeGenerator
        Parameters:
        v - A Vector of String, where each element is an expression in the target language yielding an AST node.
      • getASTCreateString

        public String getASTCreateString​(GrammarAtom atom,
                                         String astCtorArgs)
        Get a string for an expression to generate creating of an AST node
        Specified by:
        getASTCreateString in class CodeGenerator
        Parameters:
        atom - The grammar node for which you are creating the node
        str - The arguments to the AST constructor
      • getASTCreateString

        public String getASTCreateString​(String astCtorArgs)
        Returns a string expression that creates an AST node using the specified AST constructor argument string. Parses the first (possibly only) argument in the supplied AST ctor argument string to obtain the token type -- ctorID. IF the token type is a valid token symbol AND it has an associated AST node type AND this is not a #[ID, "T", "ASTType"] constructor THEN generate a call to factory.create(ID, Text, token.ASTNodeType()) #[ID, "T", "ASTType"] constructors are mapped to astFactory.create(ID, "T", "ASTType") The supported AST constructor forms are: #[ID] #[ID, "text"] #[ID, "text", ASTclassname] -- introduced in 2.7.2
        Parameters:
        astCtorArgs - The arguments to the AST constructor
      • getLookaheadTestExpression

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

        protected String getLookaheadTestExpression​(Alternative alt,
                                                    int maxDepth)
        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)
        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
        p - The lookahead set for level k
      • getRangeExpression

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

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

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

        public void setupOutput​(String className)
                         throws IOException
        This method exists so a subclass, namely VAJCodeGenerator, can open the file in its own evil way. JavaCodeGenerator simply opens a text file...
        Throws:
        IOException
      • getTokenTypesClassName

        public String getTokenTypesClassName()
        Helper method that returns the name of the interface/class/enum type for token type constants.