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com.jogamp.gluegen.cgram.StdCParser.g Maven / Gradle / Ivy
/*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Copyright (c) Non, Inc. 1997 -- All Rights Reserved
PROJECT: C Compiler
MODULE: Parser
FILE: stdc.g
AUTHOR: John D. Mitchell ([email protected] ), Jul 12, 1997
REVISION HISTORY:
Name Date Description
---- ---- -----------
JDM 97.07.12 Initial version.
JTC 97.11.18 Declaration vs declarator & misc. hacking.
JDM 97.11.20 Fixed: declaration vs funcDef,
parenthesized expressions,
declarator iteration,
varargs recognition,
empty source file recognition,
and some typos.
DESCRIPTION:
This grammar supports the Standard C language.
Note clearly that this grammar does *NOT* deal with
preprocessor functionality (including things like trigraphs)
Nor does this grammar deal with multi-byte characters nor strings
containing multi-byte characters [these constructs are "exercises
for the reader" as it were :-)].
Please refer to the ISO/ANSI C Language Standard if you believe
this grammar to be in error. Please cite chapter and verse in any
correspondence to the author to back up your claim.
TODO:
- typedefName is commented out, needs a symbol table to resolve
ambiguity.
- trees
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/
header {
package com.jogamp.gluegen.cgram;
import java.io.*;
import antlr.CommonAST;
import antlr.DumpASTVisitor;
}
class StdCParser extends Parser;
options
{
k = 2;
exportVocab = STDC;
buildAST = true;
ASTLabelType = "TNode";
// Copied following options from java grammar.
codeGenMakeSwitchThreshold = 2;
codeGenBitsetTestThreshold = 3;
}
{
// Suppport C++-style single-line comments?
public static boolean CPPComments = true;
// access to symbol table
public CSymbolTable symbolTable = new CSymbolTable();
// source for names to unnamed scopes
protected int unnamedScopeCounter = 0;
public boolean isTypedefName(String name) {
boolean returnValue = false;
TNode node = symbolTable.lookupNameInCurrentScope(name);
for (; node != null; node = (TNode) node.getNextSibling() ) {
if(node.getType() == LITERAL_typedef) {
returnValue = true;
break;
}
}
return returnValue;
}
public String getAScopeName() {
return "" + (unnamedScopeCounter++);
}
public void pushScope(String scopeName) {
symbolTable.pushScope(scopeName);
}
public void popScope() {
symbolTable.popScope();
}
int traceDepth = 0;
public void reportError(RecognitionException ex) {
try {
System.err.println("ANTLR Parsing Error: "+ex + " token name:" + tokenNames[LA(1)]);
ex.printStackTrace(System.err);
}
catch (TokenStreamException e) {
System.err.println("ANTLR Parsing Error: "+ex);
ex.printStackTrace(System.err);
}
}
public void reportError(String s) {
System.err.println("ANTLR Parsing Error from String: " + s);
}
public void reportWarning(String s) {
System.err.println("ANTLR Parsing Warning from String: " + s);
}
public void match(int t) throws MismatchedTokenException {
boolean debugging = false;
if ( debugging ) {
for (int x=0; x0)?" [inputState.guessing "+ inputState.guessing + "]":""));
}
}
try {
if ( LA(1)!=t ) {
if ( debugging ){
for (int x=0; x "+rname+"; LA(1)==("+ tokenNames[LT(1).getType()]
+ ") " + LT(1).getText() + " [inputState.guessing "+ inputState.guessing + "]");
}
catch (TokenStreamException e) {
}
}
public void traceOut(String rname) {
for (int x=0; x declaration
| functionDef
| asm_expr
;
asm_expr
: "asm"^
("volatile")? LCURLY! expr RCURLY! SEMI!
;
declaration
{ AST ds1 = null; }
: ds:declSpecifiers { ds1 = astFactory.dupList(#ds); }
(
initDeclList[ds1]
)?
SEMI!
{ ## = #( #[NDeclaration], ##); }
;
declSpecifiers
{ int specCount=0; }
: ( options { // this loop properly aborts when
// it finds a non-typedefName ID MBZ
warnWhenFollowAmbig = false;
} :
s:storageClassSpecifier
| typeQualifier
| ( "struct" | "union" | "enum" | typeSpecifier[specCount] )=>
specCount = typeSpecifier[specCount]
)+
;
storageClassSpecifier
: "auto"
| "register"
| "typedef"
| functionStorageClassSpecifier
;
functionStorageClassSpecifier
: "extern"
| "static"
;
typeQualifier
: "const"
| "volatile"
;
typeSpecifier [int specCount] returns [int retSpecCount]
{ retSpecCount = specCount + 1; }
:
( "void"
| "char"
| "short"
| "int"
| "long"
| "float"
| "double"
| "signed"
| "unsigned"
| "int8_t"
| "uint8_t"
| "int16_t"
| "uint16_t"
| "__int32"
| "int32_t"
| "wchar_t"
| "uint32_t"
| "__int64"
| "int64_t"
| "uint64_t"
| "ptrdiff_t"
| "intptr_t"
| "size_t"
| "uintptr_t"
| structOrUnionSpecifier
| enumSpecifier
| { specCount == 0 }? typedefName
)
;
typedefName
: { isTypedefName ( LT(1).getText() ) }?
i:ID { ## = #(#[NTypedefName], #i); }
;
structOrUnionSpecifier
{ String scopeName; }
: sou:structOrUnion!
( ( ID LCURLY )=> i:ID l:LCURLY
{
scopeName = #sou.getText() + " " + #i.getText();
#l.setText(scopeName);
pushScope(scopeName);
}
structDeclarationList
{ popScope();}
RCURLY!
| l1:LCURLY
{
scopeName = getAScopeName();
#l1.setText(scopeName);
pushScope(scopeName);
}
structDeclarationList
{ popScope(); }
RCURLY!
| ID
)
{
## = #( #sou, ## );
}
;
structOrUnion
: "struct"
| "union"
;
structDeclarationList
: ( structDeclaration )+
;
structDeclaration
: specifierQualifierList structDeclaratorList ( SEMI! )+
;
specifierQualifierList
{ int specCount = 0; }
: ( options { // this loop properly aborts when
// it finds a non-typedefName ID MBZ
warnWhenFollowAmbig = false;
} :
( "struct" | "union" | "enum" | typeSpecifier[specCount] )=>
specCount = typeSpecifier[specCount]
| typeQualifier
)+
;
structDeclaratorList
: structDeclarator ( COMMA! structDeclarator )*
;
structDeclarator
:
( COLON constExpr
| declarator[false] ( COLON constExpr )?
)
{ ## = #( #[NStructDeclarator], ##); }
;
enumSpecifier
: "enum"^
( ( ID LCURLY )=> i:ID LCURLY enumList[i.getText()] RCURLY!
| LCURLY enumList["anonymous"] RCURLY!
| ID
)
;
enumList[String enumName]
: enumerator[enumName] ( COMMA! enumerator[enumName] )*
;
enumerator[String enumName]
: i:ID { symbolTable.add( i.getText(),
#( null,
#[LITERAL_enum, "enum"],
#[ ID, enumName]
)
);
}
(ASSIGN constExpr)?
;
initDeclList[AST declarationSpecifiers]
: initDecl[declarationSpecifiers]
( COMMA! initDecl[declarationSpecifiers] )*
;
initDecl[AST declarationSpecifiers]
{ String declName = ""; }
: declName = d:declarator[false]
{ AST ds1, d1;
ds1 = astFactory.dupList(declarationSpecifiers);
d1 = astFactory.dupList(#d);
symbolTable.add(declName, #(null, ds1, d1) );
}
( ASSIGN initializer
| COLON expr
)?
{ ## = #( #[NInitDecl], ## ); }
;
pointerGroup
: ( STAR ( typeQualifier )* )+ { ## = #( #[NPointerGroup], ##); }
;
idList
: ID ( COMMA! ID )*
;
initializer
: ( assignExpr
| LCURLY initializerList ( COMMA! )? RCURLY!
)
{ ## = #( #[NInitializer], ## ); }
;
initializerList
: initializer ( COMMA! initializer )*
;
declarator[boolean isFunctionDefinition] returns [String declName]
{ declName = ""; }
:
( pointerGroup )?
( id:ID { declName = id.getText(); }
| LPAREN declName = declarator[false] RPAREN
)
( ! LPAREN
{
if (isFunctionDefinition) {
pushScope(declName);
}
else {
pushScope("!"+declName);
}
}
(
(declSpecifiers)=> p:parameterTypeList
{
## = #( null, ##, #( #[NParameterTypeList], #p ) );
}
| (i:idList)?
{
## = #( null, ##, #( #[NParameterTypeList], #i ) );
}
)
{
popScope();
}
RPAREN
| LBRACKET ( constExpr )? RBRACKET
)*
{ ## = #( #[NDeclarator], ## ); }
;
parameterTypeList
: parameterDeclaration
( options {
warnWhenFollowAmbig = false;
} :
COMMA!
parameterDeclaration
)*
( COMMA!
VARARGS
)?
;
parameterDeclaration
{ String declName; }
: ds:declSpecifiers
( ( declarator[false] )=> declName = d:declarator[false]
{
AST d2, ds2;
d2 = astFactory.dupList(#d);
ds2 = astFactory.dupList(#ds);
symbolTable.add(declName, #(null, ds2, d2));
}
| nonemptyAbstractDeclarator
)?
{
## = #( #[NParameterDeclaration], ## );
}
;
/* JTC:
* This handles both new and old style functions.
* see declarator rule to see differences in parameters
* and here (declaration SEMI)* is the param type decls for the
* old style. may want to do some checking to check for illegal
* combinations (but I assume all parsed code will be legal?)
*/
functionDef
{ String declName; }
: ( (functionDeclSpecifiers)=> ds:functionDeclSpecifiers
| //epsilon
)
declName = d:declarator[true]
{
AST d2, ds2;
d2 = astFactory.dupList(#d);
ds2 = astFactory.dupList(#ds);
symbolTable.add(declName, #(null, ds2, d2));
pushScope(declName);
}
( declaration )* (VARARGS)? ( SEMI! )*
{ popScope(); }
compoundStatement[declName]
{ ## = #( #[NFunctionDef], ## );}
;
functionDeclSpecifiers
{ int specCount = 0; }
: ( options { // this loop properly aborts when
// it finds a non-typedefName ID MBZ
warnWhenFollowAmbig = false;
} :
functionStorageClassSpecifier
| typeQualifier
| ( "struct" | "union" | "enum" | typeSpecifier[specCount] )=>
specCount = typeSpecifier[specCount]
)+
;
declarationList
: ( options { // this loop properly aborts when
// it finds a non-typedefName ID MBZ
warnWhenFollowAmbig = false;
} :
( declarationPredictor )=> declaration
)+
;
declarationPredictor
: (options { //only want to look at declaration if I don't see typedef
warnWhenFollowAmbig = false;
}:
"typedef"
| declaration
)
;
compoundStatement[String scopeName]
: LCURLY!
{
pushScope(scopeName);
}
( ( declarationPredictor)=> declarationList )?
( statementList )?
{ popScope(); }
RCURLY!
{ ## = #( #[NCompoundStatement, scopeName], ##); }
;
statementList
: ( statement )+
;
statement
: SEMI // Empty statements
| compoundStatement[getAScopeName()] // Group of statements
| expr SEMI! { ## = #( #[NStatementExpr], ## ); } // Expressions
// Iteration statements:
| "while"^ LPAREN! expr RPAREN! statement
| "do"^ statement "while"! LPAREN! expr RPAREN! SEMI!
|! "for"
LPAREN ( e1:expr )? SEMI ( e2:expr )? SEMI ( e3:expr )? RPAREN
s:statement
{
if ( #e1 == null) { #e1 = (TNode) #[ NEmptyExpression ]; }
if ( #e2 == null) { #e2 = (TNode) #[ NEmptyExpression ]; }
if ( #e3 == null) { #e3 = (TNode) #[ NEmptyExpression ]; }
## = #( #[LITERAL_for, "for"], #e1, #e2, #e3, #s );
}
// Jump statements:
| "goto"^ ID SEMI!
| "continue" SEMI!
| "break" SEMI!
| "return"^ ( expr )? SEMI!
// Labeled statements:
| ID COLON! (options {warnWhenFollowAmbig=false;}:statement)? { ## = #( #[NLabel], ## ); }
| "case"^ constExpr COLON! statement
| "default"^ COLON! statement
// Selection statements:
| "if"^
LPAREN! expr RPAREN! statement
( //standard if-else ambiguity
options {
warnWhenFollowAmbig = false;
} :
"else" statement )?
| "switch"^ LPAREN! expr RPAREN! statement
;
expr
: assignExpr (options {
/* MBZ:
COMMA is ambiguous between comma expressions and
argument lists. argExprList should get priority,
and it does by being deeper in the expr rule tree
and using (COMMA assignExpr)*
*/
warnWhenFollowAmbig = false;
} :
c:COMMA^ { #c.setType(NCommaExpr); } assignExpr
)*
;
assignExpr
: conditionalExpr ( a:assignOperator! assignExpr { ## = #( #a, ## );} )?
;
assignOperator
: ASSIGN
| DIV_ASSIGN
| PLUS_ASSIGN
| MINUS_ASSIGN
| STAR_ASSIGN
| MOD_ASSIGN
| RSHIFT_ASSIGN
| LSHIFT_ASSIGN
| BAND_ASSIGN
| BOR_ASSIGN
| BXOR_ASSIGN
;
conditionalExpr
: logicalOrExpr
( QUESTION^ expr COLON! conditionalExpr )?
;
constExpr
: conditionalExpr
;
logicalOrExpr
: logicalAndExpr ( LOR^ logicalAndExpr )*
;
logicalAndExpr
: inclusiveOrExpr ( LAND^ inclusiveOrExpr )*
;
inclusiveOrExpr
: exclusiveOrExpr ( BOR^ exclusiveOrExpr )*
;
exclusiveOrExpr
: bitAndExpr ( BXOR^ bitAndExpr )*
;
bitAndExpr
: equalityExpr ( BAND^ equalityExpr )*
;
equalityExpr
: relationalExpr
( ( EQUAL^ | NOT_EQUAL^ ) relationalExpr )*
;
relationalExpr
: shiftExpr
( ( LT^ | LTE^ | GT^ | GTE^ ) shiftExpr )*
;
shiftExpr
: additiveExpr
( ( LSHIFT^ | RSHIFT^ ) additiveExpr )*
;
additiveExpr
: multExpr
( ( PLUS^ | MINUS^ ) multExpr )*
;
multExpr
: castExpr
( ( STAR^ | DIV^ | MOD^ ) castExpr )*
;
castExpr
: ( LPAREN typeName RPAREN )=>
LPAREN! typeName RPAREN! ( castExpr )
{ ## = #( #[NCast, "("], ## ); }
| unaryExpr
;
typeName
: specifierQualifierList (nonemptyAbstractDeclarator)?
;
nonemptyAbstractDeclarator
: (
pointerGroup
( (LPAREN
( nonemptyAbstractDeclarator
| parameterTypeList
)?
RPAREN)
| (LBRACKET (expr)? RBRACKET)
)*
| ( (LPAREN
( nonemptyAbstractDeclarator
| parameterTypeList
)?
RPAREN)
| (LBRACKET (expr)? RBRACKET)
)+
)
{ ## = #( #[NNonemptyAbstractDeclarator], ## ); }
;
/* JTC:
LR rules:
abstractDeclarator
: nonemptyAbstractDeclarator
| // null
;
nonemptyAbstractDeclarator
: LPAREN nonemptyAbstractDeclarator RPAREN
| abstractDeclarator LPAREN RPAREN
| abstractDeclarator (LBRACKET (expr)? RBRACKET)
| STAR abstractDeclarator
;
*/
unaryExpr
: postfixExpr
| INC^ unaryExpr
| DEC^ unaryExpr
| u:unaryOperator castExpr { ## = #( #[NUnaryExpr], ## ); }
| "sizeof"^
( ( LPAREN typeName )=> LPAREN typeName RPAREN
| unaryExpr
)
;
unaryOperator
: BAND
| STAR
| PLUS
| MINUS
| BNOT
| LNOT
;
postfixExpr
: primaryExpr
(
postfixSuffix {## = #( #[NPostfixExpr], ## );}
)?
;
postfixSuffix
:
( PTR ID
| DOT ID
| functionCall
| LBRACKET expr RBRACKET
| INC
| DEC
)+
;
functionCall
:
LPAREN^ (a:argExprList)? RPAREN
{
##.setType( NFunctionCallArgs );
}
;
primaryExpr
: ID
| charConst
| intConst
| floatConst
| stringConst
// JTC:
// ID should catch the enumerator
// leaving it in gives ambiguous err
// | enumerator
| LPAREN! expr RPAREN! { ## = #( #[NExpressionGroup, "("], ## ); }
;
argExprList
: assignExpr ( COMMA! assignExpr )*
;
protected
charConst
: CharLiteral
;
protected
stringConst
: (StringLiteral)+ { ## = #(#[NStringSeq], ##); }
;
protected
intConst
: IntOctalConst
| LongOctalConst
| UnsignedOctalConst
| IntIntConst
| LongIntConst
| UnsignedIntConst
| IntHexConst
| LongHexConst
| UnsignedHexConst
;
protected
floatConst
: FloatDoubleConst
| DoubleDoubleConst
| LongDoubleConst
;
dummy
: NTypedefName
| NInitDecl
| NDeclarator
| NStructDeclarator
| NDeclaration
| NCast
| NPointerGroup
| NExpressionGroup
| NFunctionCallArgs
| NNonemptyAbstractDeclarator
| NInitializer
| NStatementExpr
| NEmptyExpression
| NParameterTypeList
| NFunctionDef
| NCompoundStatement
| NParameterDeclaration
| NCommaExpr
| NUnaryExpr
| NLabel
| NPostfixExpr
| NRangeExpr
| NStringSeq
| NInitializerElementLabel
| NLcurlyInitializer
| NAsmAttribute
| NGnuAsmExpr
| NTypeMissing
;
{
import java.io.*;
import antlr.*;
}
class StdCLexer extends Lexer;
options
{
k = 3;
exportVocab = STDC;
testLiterals = false;
}
{
LineObject lineObject = new LineObject();
String originalSource = "";
PreprocessorInfoChannel preprocessorInfoChannel = new PreprocessorInfoChannel();
int tokenNumber = 0;
boolean countingTokens = true;
int deferredLineCount = 0;
public void setCountingTokens(boolean ct)
{
countingTokens = ct;
if ( countingTokens ) {
tokenNumber = 0;
}
else {
tokenNumber = 1;
}
}
public void setOriginalSource(String src)
{
originalSource = src;
lineObject.setSource(src);
}
public void setSource(String src)
{
lineObject.setSource(src);
}
public PreprocessorInfoChannel getPreprocessorInfoChannel()
{
return preprocessorInfoChannel;
}
public void setPreprocessingDirective(String pre)
{
preprocessorInfoChannel.addLineForTokenNumber( pre, new Integer(tokenNumber) );
}
public void addDefine(String name, String value)
{
}
protected Token makeToken(int t)
{
if ( t != Token.SKIP && countingTokens) {
tokenNumber++;
}
CToken tok = (CToken) super.makeToken(t);
tok.setLine(lineObject.line);
tok.setSource(lineObject.source);
tok.setTokenNumber(tokenNumber);
lineObject.line += deferredLineCount;
deferredLineCount = 0;
return tok;
}
public void deferredNewline() {
deferredLineCount++;
}
public void newline() {
lineObject.newline();
}
}
protected
Vocabulary
: '\3'..'\377'
;
/* Operators: */
ASSIGN : '=' ;
COLON : ':' ;
COMMA : ',' ;
QUESTION : '?' ;
SEMI : ';' ;
PTR : "->" ;
// DOT & VARARGS are commented out since they are generated as part of
// the Number rule below due to some bizarre lexical ambiguity shme.
// DOT : '.' ;
protected
DOT:;
// VARARGS : "..." ;
protected
VARARGS:;
LPAREN : '(' ;
RPAREN : ')' ;
LBRACKET : '[' ;
RBRACKET : ']' ;
LCURLY : '{' ;
RCURLY : '}' ;
EQUAL : "==" ;
NOT_EQUAL : "!=" ;
LTE : "<=" ;
LT : "<" ;
GTE : ">=" ;
GT : ">" ;
DIV : '/' ;
DIV_ASSIGN : "/=" ;
PLUS : '+' ;
PLUS_ASSIGN : "+=" ;
INC : "++" ;
MINUS : '-' ;
MINUS_ASSIGN : "-=" ;
DEC : "--" ;
STAR : '*' ;
STAR_ASSIGN : "*=" ;
MOD : '%' ;
MOD_ASSIGN : "%=" ;
RSHIFT : ">>" ;
RSHIFT_ASSIGN : ">>=" ;
LSHIFT : "<<" ;
LSHIFT_ASSIGN : "<<=" ;
LAND : "&&" ;
LNOT : '!' ;
LOR : "||" ;
BAND : '&' ;
BAND_ASSIGN : "&=" ;
BNOT : '~' ;
BOR : '|' ;
BOR_ASSIGN : "|=" ;
BXOR : '^' ;
BXOR_ASSIGN : "^=" ;
Whitespace
: ( ( '\003'..'\010' | '\t' | '\013' | '\f' | '\016'.. '\037' | '\177'..'\377' | ' ' )
| "\r\n" { newline(); }
| ( '\n' | '\r' ) { newline(); }
) { _ttype = Token.SKIP; }
;
Comment
: "/*"
( { LA(2) != '/' }? '*'
| "\r\n" { deferredNewline(); }
| ( '\r' | '\n' ) { deferredNewline(); }
| ~( '*'| '\r' | '\n' )
)*
"*/" { _ttype = Token.SKIP;
}
;
CPPComment
:
"//" ( ~('\n') )*
{
_ttype = Token.SKIP;
}
;
protected NonWhitespace
: (~('\r' | '\n'))*
;
PREPROC_DIRECTIVE
options {
paraphrase = "a line directive";
}
:
'#'
( ( "line" || (( ' ' | '\t' | '\014')+ '0'..'9')) => LineDirective
| ( (Space)* "define" (Space)* i:ID (Space)* (n:DefineExpr)?
nw:NonWhitespace
("\r\n" | "\r" | "\n") ) {
if (n != null) {
// System.out.println("addDefine: #define " + i.getText() + " " + n.getText()+" @ "+lineObject.getSource()+":"+(lineObject.line+deferredLineCount));
addDefine(i.getText(), n.getText());
} else {
setPreprocessingDirective("#define " + i.getText() + " " + nw.getText());
}
deferredNewline();
}
| (~'\n')* { setPreprocessingDirective(getText()); }
)
{
_ttype = Token.SKIP;
}
;
DefineExpr:
((LPAREN) (Space)* (DefineExpr2) (Space)* (RPAREN)) | (DefineExpr2)
;
DefineExpr2:
(Number)
((Space)* (LSHIFT | RSHIFT | PLUS | MINUS | STAR | DIV | MOD) (Space)* (DefineExpr))?
;
protected Space:
( ' ' | '\t' | '\014')
;
protected LineDirective
{
boolean oldCountingTokens = countingTokens;
countingTokens = false;
}
:
{
lineObject = new LineObject();
deferredLineCount = 0;
}
("line")? //this would be for if the directive started "#line", but not there for GNU directives
(Space)+
n:Number {
lineObject.setLine(Integer.parseInt(n.getText()));
}
(Space)+
( fn:StringLiteral { try {
final String newSource = fn.getText().substring(1,fn.getText().length()-1);
// System.out.println("line: "+lineObject.getSource()+" -> "+newSource+", line "+(lineObject.line+deferredLineCount));
lineObject.setSource(newSource);
}
catch (StringIndexOutOfBoundsException e) { /*not possible*/ }
}
| fi:ID { lineObject.setSource(fi.getText()); }
)?
(Space)*
("1" { lineObject.setEnteringFile(true); } )?
(Space)*
("2" { lineObject.setReturningToFile(true); } )?
(Space)*
("3" { lineObject.setSystemHeader(true); } )?
(Space)*
("4" { lineObject.setTreatAsC(true); } )?
(~('\r' | '\n'))*
("\r\n" | "\r" | "\n")
{
preprocessorInfoChannel.addLineForTokenNumber(new LineObject(lineObject), new Integer(tokenNumber));
countingTokens = oldCountingTokens;
}
;
/* Literals: */
/*
* Note that we do NOT handle tri-graphs nor multi-byte sequences.
*/
/*
* Note that we can't have empty character constants (even though we
* can have empty strings :-).
*/
CharLiteral
: '\'' ( Escape | ~( '\'' ) ) '\''
;
/*
* Can't have raw imbedded newlines in string constants. Strict reading of
* the standard gives odd dichotomy between newlines & carriage returns.
* Go figure.
*/
StringLiteral
: '"'
( Escape
| (
'\r' { deferredNewline(); }
| '\n' {
deferredNewline();
_ttype = BadStringLiteral;
}
| '\\' '\n' {
deferredNewline();
}
)
| ~( '"' | '\r' | '\n' | '\\' )
)*
'"'
;
protected BadStringLiteral
: // Imaginary token.
;
/*
* Handle the various escape sequences.
*
* Note carefully that these numeric escape *sequences* are *not* of the
* same form as the C language numeric *constants*.
*
* There is no such thing as a binary numeric escape sequence.
*
* Octal escape sequences are either 1, 2, or 3 octal digits exactly.
*
* There is no such thing as a decimal escape sequence.
*
* Hexadecimal escape sequences are begun with a leading \x and continue
* until a non-hexadecimal character is found.
*
* No real handling of tri-graph sequences, yet.
*/
protected
Escape
: '\\'
( options{warnWhenFollowAmbig=false;}:
'a'
| 'b'
| 'f'
| 'n'
| 'r'
| 't'
| 'v'
| '"'
| '\''
| '\\'
| '?'
| ('0'..'3') ( options{warnWhenFollowAmbig=false;}: Digit ( options{warnWhenFollowAmbig=false;}: Digit )? )?
| ('4'..'7') ( options{warnWhenFollowAmbig=false;}: Digit )?
| 'x' ( options{warnWhenFollowAmbig=false;}: Digit | 'a'..'f' | 'A'..'F' )+
)
;
/* Numeric Constants: */
protected
Digit
: '0'..'9'
;
protected
LongSuffix
: 'l'
| 'L'
;
protected
UnsignedSuffix
: 'u'
| 'U'
;
protected
FloatSuffix
: 'f'
| 'F'
;
protected
Exponent
: ( 'e' | 'E' ) ( '+' | '-' )? ( Digit )+
;
protected
DoubleDoubleConst:;
protected
FloatDoubleConst:;
protected
LongDoubleConst:;
protected
IntOctalConst:;
protected
LongOctalConst:;
protected
UnsignedOctalConst:;
protected
IntIntConst:;
protected
LongIntConst:;
protected
UnsignedIntConst:;
protected
IntHexConst:;
protected
LongHexConst:;
protected
UnsignedHexConst:;
Number
: ( ( Digit )+ ( '.' | 'e' | 'E' ) )=> ( Digit )+
( '.' ( Digit )* ( Exponent )?
| Exponent
) { _ttype = DoubleDoubleConst; }
( FloatSuffix { _ttype = FloatDoubleConst; }
| LongSuffix { _ttype = LongDoubleConst; }
)?
| ( "..." )=> "..." { _ttype = VARARGS; }
| '.' { _ttype = DOT; }
( ( Digit )+ ( Exponent )?
{ _ttype = DoubleDoubleConst; }
( FloatSuffix { _ttype = FloatDoubleConst; }
| LongSuffix { _ttype = LongDoubleConst; }
)?
)?
| '0' ( '0'..'7' )* { _ttype = IntOctalConst; }
( LongSuffix { _ttype = LongOctalConst; }
| UnsignedSuffix { _ttype = UnsignedOctalConst; }
)?
| '1'..'9' ( Digit )* { _ttype = IntIntConst; }
( LongSuffix { _ttype = LongIntConst; }
| UnsignedSuffix { _ttype = UnsignedIntConst; }
)?
| '0' ( 'x' | 'X' ) ( 'a'..'f' | 'A'..'F' | Digit )+
{ _ttype = IntHexConst; }
( LongSuffix { _ttype = LongHexConst; }
| UnsignedSuffix { _ttype = UnsignedHexConst; }
)?
;
ID
options
{
testLiterals = true;
}
: ( 'a'..'z' | 'A'..'Z' | '_' )
( 'a'..'z' | 'A'..'Z' | '_' | '0'..'9' )*
;
