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Diffstat (limited to 'src/java/com/sun/gluegen/jgram/JavaParser.g')
| -rw-r--r-- | src/java/com/sun/gluegen/jgram/JavaParser.g | 1315 |
1 files changed, 0 insertions, 1315 deletions
diff --git a/src/java/com/sun/gluegen/jgram/JavaParser.g b/src/java/com/sun/gluegen/jgram/JavaParser.g deleted file mode 100644 index e3a1962..0000000 --- a/src/java/com/sun/gluegen/jgram/JavaParser.g +++ /dev/null @@ -1,1315 +0,0 @@ -/* Java 1.3 Recognizer - * - * Run 'java Main [-showtree] directory-full-of-java-files' - * - * [The -showtree option pops up a Swing frame that shows - * the AST constructed from the parser.] - * - * Run 'java Main <directory full of java files>' - * - * Contributing authors: - * John Mitchell [email protected] - * Terence Parr [email protected] - * John Lilley [email protected] - * Scott Stanchfield [email protected] - * Markus Mohnen [email protected] - * Peter Williams [email protected] - * Allan Jacobs [email protected] - * Steve Messick [email protected] - * John Pybus [email protected] - * - * Version 1.00 December 9, 1997 -- initial release - * Version 1.01 December 10, 1997 - * fixed bug in octal def (0..7 not 0..8) - * Version 1.10 August 1998 (parrt) - * added tree construction - * fixed definition of WS,comments for mac,pc,unix newlines - * added unary plus - * Version 1.11 (Nov 20, 1998) - * Added "shutup" option to turn off last ambig warning. - * Fixed inner class def to allow named class defs as statements - * synchronized requires compound not simple statement - * add [] after builtInType DOT class in primaryExpression - * "const" is reserved but not valid..removed from modifiers - * Version 1.12 (Feb 2, 1999) - * Changed LITERAL_xxx to xxx in tree grammar. - * Updated java.g to use tokens {...} now for 2.6.0 (new feature). - * - * Version 1.13 (Apr 23, 1999) - * Didn't have (stat)? for else clause in tree parser. - * Didn't gen ASTs for interface extends. Updated tree parser too. - * Updated to 2.6.0. - * Version 1.14 (Jun 20, 1999) - * Allowed final/abstract on local classes. - * Removed local interfaces from methods - * Put instanceof precedence where it belongs...in relationalExpr - * It also had expr not type as arg; fixed it. - * Missing ! on SEMI in classBlock - * fixed: (expr) + "string" was parsed incorrectly (+ as unary plus). - * fixed: didn't like Object[].class in parser or tree parser - * Version 1.15 (Jun 26, 1999) - * Screwed up rule with instanceof in it. :( Fixed. - * Tree parser didn't like (expr).something; fixed. - * Allowed multiple inheritance in tree grammar. oops. - * Version 1.16 (August 22, 1999) - * Extending an interface built a wacky tree: had extra EXTENDS. - * Tree grammar didn't allow multiple superinterfaces. - * Tree grammar didn't allow empty var initializer: {} - * Version 1.17 (October 12, 1999) - * ESC lexer rule allowed 399 max not 377 max. - * java.tree.g didn't handle the expression of synchronized - * statements. - * Version 1.18 (August 12, 2001) - * Terence updated to Java 2 Version 1.3 by - * observing/combining work of Allan Jacobs and Steve - * Messick. Handles 1.3 src. Summary: - * o primary didn't include boolean.class kind of thing - * o constructor calls parsed explicitly now: - * see explicitConstructorInvocation - * o add strictfp modifier - * o missing objBlock after new expression in tree grammar - * o merged local class definition alternatives, moved after declaration - * o fixed problem with ClassName.super.field - * o reordered some alternatives to make things more efficient - * o long and double constants were not differentiated from int/float - * o whitespace rule was inefficient: matched only one char - * o add an examples directory with some nasty 1.3 cases - * o made Main.java use buffered IO and a Reader for Unicode support - * o supports UNICODE? - * Using Unicode charVocabulay makes code file big, but only - * in the bitsets at the end. I need to make ANTLR generate - * unicode bitsets more efficiently. - * Version 1.19 (April 25, 2002) - * Terence added in nice fixes by John Pybus concerning floating - * constants and problems with super() calls. John did a nice - * reorg of the primary/postfix expression stuff to read better - * and makes f.g.super() parse properly (it was METHOD_CALL not - * a SUPER_CTOR_CALL). Also: - * - * o "finally" clause was a root...made it a child of "try" - * o Added stuff for asserts too for Java 1.4, but *commented out* - * as it is not backward compatible. - * - * Version 1.20 (October 27, 2002) - * - * Terence ended up reorging John Pybus' stuff to - * remove some nondeterminisms and some syntactic predicates. - * Note that the grammar is stricter now; e.g., this(...) must - * be the first statement. - * - * Trinary ?: operator wasn't working as array name: - * (isBig ? bigDigits : digits)[i]; - * - * Checked parser/tree parser on source for - * Resin-2.0.5, jive-2.1.1, jdk 1.3.1, Lucene, antlr 2.7.2a4, - * and the 110k-line jGuru server source. - * - * Version 1.21 (October 17, 2003) - * Fixed lots of problems including: - * Ray Waldin: add typeDefinition to interfaceBlock in java.tree.g - * He found a problem/fix with floating point that start with 0 - * Ray also fixed problem that (int.class) was not recognized. - * Thorsten van Ellen noticed that \n are allowed incorrectly in strings. - * TJP fixed CHAR_LITERAL analogously. - * - * Version 1.22 (April 14, 2004) - * Changed vocab to be ..\uFFFE to avoid -1 char. removed dummy VOCAB rule. - * - * This grammar is in the PUBLIC DOMAIN - */ - -header { - package com.sun.gluegen.jgram; - - import java.util.*; - - import antlr.CommonAST; -} - -class JavaParser extends Parser; - -options { - k = 2; // two token lookahead - exportVocab=Java; // Call its vocabulary "Java" - codeGenMakeSwitchThreshold = 2; // Some optimizations - codeGenBitsetTestThreshold = 3; - defaultErrorHandler = false; // Don't generate parser error handlers - buildAST = true; - //buildAST = false; -} - -tokens { - BLOCK; MODIFIERS; OBJBLOCK; SLIST; CTOR_DEF; METHOD_DEF; VARIABLE_DEF; - INSTANCE_INIT; STATIC_INIT; TYPE; CLASS_DEF; INTERFACE_DEF; - PACKAGE_DEF; ARRAY_DECLARATOR; EXTENDS_CLAUSE; IMPLEMENTS_CLAUSE; - PARAMETERS; PARAMETER_DEF; LABELED_STAT; TYPECAST; INDEX_OP; - POST_INC; POST_DEC; METHOD_CALL; EXPR; ARRAY_INIT; - IMPORT; UNARY_MINUS; UNARY_PLUS; CASE_GROUP; ELIST; FOR_INIT; FOR_CONDITION; - FOR_ITERATOR; EMPTY_STAT; FINAL="final"; ABSTRACT="abstract"; - STRICTFP="strictfp"; SUPER_CTOR_CALL; CTOR_CALL; -} - -{ - public void clearParsedEnumNames() { - enumNames.clear(); - } - - /** Returns the EnumTypes this HeaderParser processed. */ - public Set getParsedEnumNames() { - return enumNames; - } - - /** Clears the list of functions this HeaderParser has parsed. - Useful when reusing the same HeaderParser for more than one - header file. */ - public void clearParsedFunctionNames() { - functionNames.clear(); - } - - /** Returns the list of FunctionSymbols this HeaderParser has parsed. */ - public Set getParsedFunctionNames() { - return functionNames; - } - - private Set/*<String>*/ functionNames = new HashSet(); - // hash from name of an enumerated value to the EnumType to which it belongs - private Set/*<String>*/ enumNames = new HashSet(); - - private int blockDepth = 0; -} - -// Compilation Unit: In Java, this is a single file. This is the start -// rule for this parser -compilationUnit - : // A compilation unit starts with an optional package definition - ( packageDefinition - | /* nothing */ - ) - - // Next we have a series of zero or more import statements - ( importDefinition )* - - // Wrapping things up with any number of class or interface - // definitions - ( typeDefinition )* - - EOF! - ; - - -// Package statement: "package" followed by an identifier. -packageDefinition - options {defaultErrorHandler = true;} // let ANTLR handle errors - : p:"package"^ {#p.setType(PACKAGE_DEF);} identifier SEMI! - ; - - -// Import statement: import followed by a package or class name -importDefinition - options {defaultErrorHandler = true;} - : i:"import"^ {#i.setType(IMPORT);} identifierStar SEMI! - ; - -// A type definition in a file is either a class or interface definition. -typeDefinition - options {defaultErrorHandler = true;} - : m:modifiers! - ( classDefinition[#m] - | interfaceDefinition[#m] - ) - | SEMI! - ; - -/** A declaration is the creation of a reference or primitive-type variable - * Create a separate Type/Var tree for each var in the var list. - */ -declaration! - : m:modifiers t:typeSpec[false] v:variableDefinitions[#m,#t] - {#declaration = #v;} - ; - -// A type specification is a type name with possible brackets afterwards -// (which would make it an array type). -typeSpec[boolean addImagNode] - : classTypeSpec[addImagNode] - | builtInTypeSpec[addImagNode] - ; - -// A class type specification is a class type with possible brackets afterwards -// (which would make it an array type). -classTypeSpec[boolean addImagNode] - : identifier (lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!)* - { - if ( addImagNode ) { - #classTypeSpec = #(#[TYPE,"TYPE"], #classTypeSpec); - } - } - ; - -// A builtin type specification is a builtin type with possible brackets -// afterwards (which would make it an array type). -builtInTypeSpec[boolean addImagNode] - : builtInType (lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!)* - { - if ( addImagNode ) { - #builtInTypeSpec = #(#[TYPE,"TYPE"], #builtInTypeSpec); - } - } - ; - -// A type name. which is either a (possibly qualified) class name or -// a primitive (builtin) type -type - : identifier - | builtInType - ; - -// The primitive types. -builtInType - : "void" - | "boolean" - | "byte" - | "char" - | "short" - | "int" - | "float" - | "long" - | "double" - ; - -// A (possibly-qualified) java identifier. We start with the first IDENT -// and expand its name by adding dots and following IDENTS -identifier - : IDENT ( DOT^ IDENT )* - ; - -identifierStar - : IDENT - ( DOT^ IDENT )* - ( DOT^ STAR )? - ; - -// A list of zero or more modifiers. We could have used (modifier)* in -// place of a call to modifiers, but I thought it was a good idea to keep -// this rule separate so they can easily be collected in a Vector if -// someone so desires -modifiers - : ( modifier )* - {#modifiers = #([MODIFIERS, "MODIFIERS"], #modifiers);} - ; - -// modifiers for Java classes, interfaces, class/instance vars and methods -modifier - : "private" - | "public" - | "protected" - | "static" - | "transient" - | "final" - | "abstract" - | "native" - | "threadsafe" - | "synchronized" -// | "const" // reserved word, but not valid - | "volatile" - | "strictfp" - ; - -// Definition of a Java class -classDefinition![AST modifiers] - : "class" IDENT - // it _might_ have a superclass... - sc:superClassClause - // it might implement some interfaces... - ic:implementsClause - // now parse the body of the class - cb:classBlock - {#classDefinition = #(#[CLASS_DEF,"CLASS_DEF"], - modifiers,IDENT,sc,ic,cb);} - ; - -superClassClause! - : ( "extends" id:identifier )? - {#superClassClause = #(#[EXTENDS_CLAUSE,"EXTENDS_CLAUSE"],id);} - ; - -// Definition of a Java Interface -interfaceDefinition![AST modifiers] - : "interface" IDENT - // it might extend some other interfaces - ie:interfaceExtends - // now parse the body of the interface (looks like a class...) - cb:classBlock - {#interfaceDefinition = #(#[INTERFACE_DEF,"INTERFACE_DEF"], - modifiers,IDENT,ie,cb);} - ; - - -// This is the body of a class. You can have fields and extra semicolons, -// That's about it (until you see what a field is...) -classBlock - : LCURLY! { blockDepth++; } - ( field | SEMI! )* - RCURLY! { blockDepth--; } - {#classBlock = #([OBJBLOCK, "OBJBLOCK"], #classBlock);} - ; - -// An interface can extend several other interfaces... -interfaceExtends - : ( - e:"extends"! - identifier ( COMMA! identifier )* - )? - {#interfaceExtends = #(#[EXTENDS_CLAUSE,"EXTENDS_CLAUSE"], - #interfaceExtends);} - ; - -// A class can implement several interfaces... -implementsClause - : ( - i:"implements"! identifier ( COMMA! identifier )* - )? - {#implementsClause = #(#[IMPLEMENTS_CLAUSE,"IMPLEMENTS_CLAUSE"], - #implementsClause);} - ; - -// Now the various things that can be defined inside a class or interface... -// Note that not all of these are really valid in an interface (constructors, -// for example), and if this grammar were used for a compiler there would -// need to be some semantic checks to make sure we're doing the right thing... -field! - : // method, constructor, or variable declaration - mods:modifiers - ( h:ctorHead s:constructorBody // constructor - {#field = #(#[CTOR_DEF,"CTOR_DEF"], mods, h, s);} - - | cd:classDefinition[#mods] // inner class - {#field = #cd;} - - | id:interfaceDefinition[#mods] // inner interface - {#field = #id;} - - | t:typeSpec[false] // method or variable declaration(s) - ( fn:IDENT // the name of the method - - // parse the formal parameter declarations. - LPAREN! param:parameterDeclarationList RPAREN! - - rt:declaratorBrackets[#t] - - // get the list of exceptions that this method is - // declared to throw - (tc:throwsClause)? - - ( s2:compoundStatement | SEMI ) - {#field = #(#[METHOD_DEF,"METHOD_DEF"], - mods, - #(#[TYPE,"TYPE"],rt), - fn, - param, - tc, - s2); - if(blockDepth==1) { - functionNames.add(fn.getText()); } } - | v:variableDefinitions[#mods,#t] SEMI -// {#field = #(#[VARIABLE_DEF,"VARIABLE_DEF"], v);} - {#field = #v;} - ) - ) - - // "static { ... }" class initializer - | "static" s3:compoundStatement - {#field = #(#[STATIC_INIT,"STATIC_INIT"], s3);} - - // "{ ... }" instance initializer - | s4:compoundStatement - {#field = #(#[INSTANCE_INIT,"INSTANCE_INIT"], s4);} - ; - -constructorBody - : lc:LCURLY^ {#lc.setType(SLIST); blockDepth++; } - ( options { greedy=true; } : explicitConstructorInvocation)? - (statement)* - RCURLY! { blockDepth--; } - ; - -/** Catch obvious constructor calls, but not the expr.super(...) calls */ -explicitConstructorInvocation - : "this"! lp1:LPAREN^ argList RPAREN! SEMI! - {#lp1.setType(CTOR_CALL);} - | "super"! lp2:LPAREN^ argList RPAREN! SEMI! - {#lp2.setType(SUPER_CTOR_CALL);} - ; - -variableDefinitions[AST mods, AST t] - : variableDeclarator[getASTFactory().dupTree(mods), - getASTFactory().dupTree(t)] - ( COMMA! - variableDeclarator[getASTFactory().dupTree(mods), - getASTFactory().dupTree(t)] - )* - ; - -/** Declaration of a variable. This can be a class/instance variable, - * or a local variable in a method - * It can also include possible initialization. - */ -variableDeclarator![AST mods, AST t] - : id:IDENT d:declaratorBrackets[t] v:varInitializer - {#variableDeclarator = #(#[VARIABLE_DEF,"VARIABLE_DEF"], mods, #(#[TYPE,"TYPE"],d), id, v); - if(blockDepth==1) { - enumNames.add(id.getText()); - } - } - ; - -declaratorBrackets[AST typ] - : {#declaratorBrackets=typ;} - (lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} RBRACK!)* - ; - -varInitializer - : ( ASSIGN^ initializer )? - ; - -// This is an initializer used to set up an array. -arrayInitializer - : lc:LCURLY^ {#lc.setType(ARRAY_INIT); blockDepth++; } - ( initializer - ( - // CONFLICT: does a COMMA after an initializer start a new - // initializer or start the option ',' at end? - // ANTLR generates proper code by matching - // the comma as soon as possible. - options { - warnWhenFollowAmbig = false; - } - : - COMMA! initializer - )* - (COMMA!)? - )? - RCURLY! { blockDepth--; } - ; - - -// The two "things" that can initialize an array element are an expression -// and another (nested) array initializer. -initializer - : expression - | arrayInitializer - ; - -// This is the header of a method. It includes the name and parameters -// for the method. -// This also watches for a list of exception classes in a "throws" clause. -ctorHead - : IDENT // the name of the method - - // parse the formal parameter declarations. - LPAREN! parameterDeclarationList RPAREN! - - // get the list of exceptions that this method is declared to throw - (throwsClause)? - ; - -// This is a list of exception classes that the method is declared to throw -throwsClause - : "throws"^ identifier ( COMMA! identifier )* - ; - - -// A list of formal parameters -parameterDeclarationList - : ( parameterDeclaration ( COMMA! parameterDeclaration )* )? - {#parameterDeclarationList = #(#[PARAMETERS,"PARAMETERS"], - #parameterDeclarationList);} - ; - -// A formal parameter. -parameterDeclaration! - : pm:parameterModifier t:typeSpec[false] id:IDENT - pd:declaratorBrackets[#t] - {#parameterDeclaration = #(#[PARAMETER_DEF,"PARAMETER_DEF"], - pm, #([TYPE,"TYPE"],pd), id);} - ; - -parameterModifier - : (f:"final")? - {#parameterModifier = #(#[MODIFIERS,"MODIFIERS"], f);} - ; - -// Compound statement. This is used in many contexts: -// Inside a class definition prefixed with "static": -// it is a class initializer -// Inside a class definition without "static": -// it is an instance initializer -// As the body of a method -// As a completely indepdent braced block of code inside a method -// it starts a new scope for variable definitions - -compoundStatement - : lc:LCURLY^ {#lc.setType(SLIST); blockDepth++; } - // include the (possibly-empty) list of statements - (statement)* - RCURLY! { blockDepth--; } - ; - - -statement - // A list of statements in curly braces -- start a new scope! - : compoundStatement - - // declarations are ambiguous with "ID DOT" relative to expression - // statements. Must backtrack to be sure. Could use a semantic - // predicate to test symbol table to see what the type was coming - // up, but that's pretty hard without a symbol table ;) - | (declaration)=> declaration SEMI! - - // An expression statement. This could be a method call, - // assignment statement, or any other expression evaluated for - // side-effects. - | expression SEMI! - - // class definition - | m:modifiers! classDefinition[#m] - - // Attach a label to the front of a statement - | IDENT c:COLON^ {#c.setType(LABELED_STAT);} statement - - // If-else statement - | "if"^ LPAREN! expression RPAREN! statement - ( - // CONFLICT: the old "dangling-else" problem... - // ANTLR generates proper code matching - // as soon as possible. Hush warning. - options { - warnWhenFollowAmbig = false; - } - : - "else"! statement - )? - - // For statement - | "for"^ - LPAREN! - forInit SEMI! // initializer - forCond SEMI! // condition test - forIter // updater - RPAREN! - statement // statement to loop over - - // While statement - | "while"^ LPAREN! expression RPAREN! statement - - // do-while statement - | "do"^ statement "while"! LPAREN! expression RPAREN! SEMI! - - // get out of a loop (or switch) - | "break"^ (IDENT)? SEMI! - - // do next iteration of a loop - | "continue"^ (IDENT)? SEMI! - - // Return an expression - | "return"^ (expression)? SEMI! - - // switch/case statement - | "switch"^ LPAREN! expression RPAREN! LCURLY! { blockDepth++; } - ( casesGroup )* - RCURLY! { blockDepth--; } - - // exception try-catch block - | tryBlock - - // throw an exception - | "throw"^ expression SEMI! - - // synchronize a statement - | "synchronized"^ LPAREN! expression RPAREN! compoundStatement - - // asserts (uncomment if you want 1.4 compatibility) - // | "assert"^ expression ( COLON! expression )? SEMI! - - // empty statement - | s:SEMI {#s.setType(EMPTY_STAT);} - ; - -casesGroup - : ( // CONFLICT: to which case group do the statements bind? - // ANTLR generates proper code: it groups the - // many "case"/"default" labels together then - // follows them with the statements - options { - greedy = true; - } - : - aCase - )+ - caseSList - {#casesGroup = #([CASE_GROUP, "CASE_GROUP"], #casesGroup);} - ; - -aCase - : ("case"^ expression | "default") COLON! - ; - -caseSList - : (statement)* - {#caseSList = #(#[SLIST,"SLIST"],#caseSList);} - ; - -// The initializer for a for loop -forInit - // if it looks like a declaration, it is - : ( (declaration)=> declaration - // otherwise it could be an expression list... - | expressionList - )? - {#forInit = #(#[FOR_INIT,"FOR_INIT"],#forInit);} - ; - -forCond - : (expression)? - {#forCond = #(#[FOR_CONDITION,"FOR_CONDITION"],#forCond);} - ; - -forIter - : (expressionList)? - {#forIter = #(#[FOR_ITERATOR,"FOR_ITERATOR"],#forIter);} - ; - -// an exception handler try/catch block -tryBlock - : "try"^ compoundStatement - (handler)* - ( finallyClause )? - ; - -finallyClause - : "finally"^ compoundStatement - ; - -// an exception handler -handler - : "catch"^ LPAREN! parameterDeclaration RPAREN! compoundStatement - ; - - -// expressions -// Note that most of these expressions follow the pattern -// thisLevelExpression : -// nextHigherPrecedenceExpression -// (OPERATOR nextHigherPrecedenceExpression)* -// which is a standard recursive definition for a parsing an expression. -// The operators in java have the following precedences: -// lowest (13) = *= /= %= += -= <<= >>= >>>= &= ^= |= -// (12) ?: -// (11) || -// (10) && -// ( 9) | -// ( 8) ^ -// ( 7) & -// ( 6) == != -// ( 5) < <= > >= -// ( 4) << >> -// ( 3) +(binary) -(binary) -// ( 2) * / % -// ( 1) ++ -- +(unary) -(unary) ~ ! (type) -// [] () (method call) . (dot -- identifier qualification) -// new () (explicit parenthesis) -// -// the last two are not usually on a precedence chart; I put them in -// to point out that new has a higher precedence than '.', so you -// can validy use -// new Frame().show() -// -// Note that the above precedence levels map to the rules below... -// Once you have a precedence chart, writing the appropriate rules as below -// is usually very straightfoward - - - -// the mother of all expressions -expression - : assignmentExpression - {#expression = #(#[EXPR,"EXPR"],#expression);} - ; - - -// This is a list of expressions. -expressionList - : expression (COMMA! expression)* - {#expressionList = #(#[ELIST,"ELIST"], expressionList);} - ; - - -// assignment expression (level 13) -assignmentExpression - : conditionalExpression - ( ( ASSIGN^ - | PLUS_ASSIGN^ - | MINUS_ASSIGN^ - | STAR_ASSIGN^ - | DIV_ASSIGN^ - | MOD_ASSIGN^ - | SR_ASSIGN^ - | BSR_ASSIGN^ - | SL_ASSIGN^ - | BAND_ASSIGN^ - | BXOR_ASSIGN^ - | BOR_ASSIGN^ - ) - assignmentExpression - )? - ; - - -// conditional test (level 12) -conditionalExpression - : logicalOrExpression - ( QUESTION^ assignmentExpression COLON! conditionalExpression )? - ; - - -// logical or (||) (level 11) -logicalOrExpression - : logicalAndExpression (LOR^ logicalAndExpression)* - ; - - -// logical and (&&) (level 10) -logicalAndExpression - : inclusiveOrExpression (LAND^ inclusiveOrExpression)* - ; - - -// bitwise or non-short-circuiting or (|) (level 9) -inclusiveOrExpression - : exclusiveOrExpression (BOR^ exclusiveOrExpression)* - ; - - -// exclusive or (^) (level 8) -exclusiveOrExpression - : andExpression (BXOR^ andExpression)* - ; - - -// bitwise or non-short-circuiting and (&) (level 7) -andExpression - : equalityExpression (BAND^ equalityExpression)* - ; - - -// equality/inequality (==/!=) (level 6) -equalityExpression - : relationalExpression ((NOT_EQUAL^ | EQUAL^) relationalExpression)* - ; - - -// boolean relational expressions (level 5) -relationalExpression - : shiftExpression - ( ( ( LT^ - | GT^ - | LE^ - | GE^ - ) - shiftExpression - )* - | "instanceof"^ typeSpec[true] - ) - ; - - -// bit shift expressions (level 4) -shiftExpression - : additiveExpression ((SL^ | SR^ | BSR^) additiveExpression)* - ; - - -// binary addition/subtraction (level 3) -additiveExpression - : multiplicativeExpression ((PLUS^ | MINUS^) multiplicativeExpression)* - ; - - -// multiplication/division/modulo (level 2) -multiplicativeExpression - : unaryExpression ((STAR^ | DIV^ | MOD^ ) unaryExpression)* - ; - -unaryExpression - : INC^ unaryExpression - | DEC^ unaryExpression - | MINUS^ {#MINUS.setType(UNARY_MINUS);} unaryExpression - | PLUS^ {#PLUS.setType(UNARY_PLUS);} unaryExpression - | unaryExpressionNotPlusMinus - ; - -unaryExpressionNotPlusMinus - : BNOT^ unaryExpression - | LNOT^ unaryExpression - - // use predicate to skip cases like: (int.class) - | (LPAREN builtInTypeSpec[true] RPAREN) => - lpb:LPAREN^ {#lpb.setType(TYPECAST);} builtInTypeSpec[true] RPAREN! - unaryExpression - - // Have to backtrack to see if operator follows. If no operator - // follows, it's a typecast. No semantic checking needed to parse. - // if it _looks_ like a cast, it _is_ a cast; else it's a "(expr)" - | (LPAREN classTypeSpec[true] RPAREN unaryExpressionNotPlusMinus)=> - lp:LPAREN^ {#lp.setType(TYPECAST);} classTypeSpec[true] RPAREN! - unaryExpressionNotPlusMinus - - | postfixExpression - ; - -// qualified names, array expressions, method invocation, post inc/dec -postfixExpression - : - /* - "this"! lp1:LPAREN^ argList RPAREN! - {#lp1.setType(CTOR_CALL);} - - | "super"! lp2:LPAREN^ argList RPAREN! - {#lp2.setType(SUPER_CTOR_CALL);} - | - */ - primaryExpression - - ( - /* - options { - // the use of postfixExpression in SUPER_CTOR_CALL adds DOT - // to the lookahead set, and gives loads of false non-det - // warnings. - // shut them off. - generateAmbigWarnings=false; - } - : */ - DOT^ IDENT - ( lp:LPAREN^ {#lp.setType(METHOD_CALL);} - argList - RPAREN! - )? - | DOT^ "this" - - | DOT^ "super" - ( // (new Outer()).super() (create enclosing instance) - lp3:LPAREN^ argList RPAREN! - {#lp3.setType(SUPER_CTOR_CALL);} - | DOT^ IDENT - ( lps:LPAREN^ {#lps.setType(METHOD_CALL);} - argList - RPAREN! - )? - ) - | DOT^ newExpression - | lb:LBRACK^ {#lb.setType(INDEX_OP);} expression RBRACK! - )* - - ( // possibly add on a post-increment or post-decrement. - // allows INC/DEC on too much, but semantics can check - in:INC^ {#in.setType(POST_INC);} - | de:DEC^ {#de.setType(POST_DEC);} - )? - ; - -// the basic element of an expression -primaryExpression - : identPrimary ( options {greedy=true;} : DOT^ "class" )? - | constant - | "true" - | "false" - | "null" - | newExpression - | "this" - | "super" - | LPAREN! assignmentExpression RPAREN! - // look for int.class and int[].class - | builtInType - ( lbt:LBRACK^ {#lbt.setType(ARRAY_DECLARATOR);} RBRACK! )* - DOT^ "class" - ; - -/** Match a, a.b.c refs, a.b.c(...) refs, a.b.c[], a.b.c[].class, - * and a.b.c.class refs. Also this(...) and super(...). Match - * this or super. - */ -identPrimary - : IDENT - ( - options { - // .ident could match here or in postfixExpression. - // We do want to match here. Turn off warning. - greedy=true; - } - : DOT^ IDENT - )* - ( - options { - // ARRAY_DECLARATOR here conflicts with INDEX_OP in - // postfixExpression on LBRACK RBRACK. - // We want to match [] here, so greedy. This overcomes - // limitation of linear approximate lookahead. - greedy=true; - } - : ( lp:LPAREN^ {#lp.setType(METHOD_CALL);} argList RPAREN! ) - | ( options {greedy=true;} : - lbc:LBRACK^ {#lbc.setType(ARRAY_DECLARATOR);} RBRACK! - )+ - )? - ; - -/** object instantiation. - * Trees are built as illustrated by the following input/tree pairs: - * - * new T() - * - * new - * | - * T -- ELIST - * | - * arg1 -- arg2 -- .. -- argn - * - * new int[] - * - * new - * | - * int -- ARRAY_DECLARATOR - * - * new int[] {1,2} - * - * new - * | - * int -- ARRAY_DECLARATOR -- ARRAY_INIT - * | - * EXPR -- EXPR - * | | - * 1 2 - * - * new int[3] - * new - * | - * int -- ARRAY_DECLARATOR - * | - * EXPR - * | - * 3 - * - * new int[1][2] - * - * new - * | - * int -- ARRAY_DECLARATOR - * | - * ARRAY_DECLARATOR -- EXPR - * | | - * EXPR 1 - * | - * 2 - * - */ -newExpression - : "new"^ type - ( LPAREN! argList RPAREN! (classBlock)? - - //java 1.1 - // Note: This will allow bad constructs like - // new int[4][][3] {exp,exp}. - // There needs to be a semantic check here... - // to make sure: - // a) [ expr ] and [ ] are not mixed - // b) [ expr ] and an init are not used together - - | newArrayDeclarator (arrayInitializer)? - ) - ; - -argList - : ( expressionList - | /*nothing*/ - {#argList = #[ELIST,"ELIST"];} - ) - ; - -newArrayDeclarator - : ( - // CONFLICT: - // newExpression is a primaryExpression which can be - // followed by an array index reference. This is ok, - // as the generated code will stay in this loop as - // long as it sees an LBRACK (proper behavior) - options { - warnWhenFollowAmbig = false; - } - : - lb:LBRACK^ {#lb.setType(ARRAY_DECLARATOR);} - (expression)? - RBRACK! - )+ - ; - -constant - : NUM_INT - | CHAR_LITERAL - | STRING_LITERAL - | NUM_FLOAT - | NUM_LONG - | NUM_DOUBLE - ; - -//---------------------------------------------------------------------------- -// The Java scanner -//---------------------------------------------------------------------------- -class JavaLexer extends Lexer; - -options { - exportVocab=Java; // call the vocabulary "Java" - testLiterals=false; // don't automatically test for literals - k=4; // four characters of lookahead - charVocabulary='\u0003'..'\u7FFE'; - // without inlining some bitset tests, couldn't do unicode; - // I need to make ANTLR generate smaller bitsets; see - // bottom of JavaLexer.java - codeGenBitsetTestThreshold=20; -} - -// OPERATORS -QUESTION : '?' ; -LPAREN : '(' ; -RPAREN : ')' ; -LBRACK : '[' ; -RBRACK : ']' ; -LCURLY : '{' ; -RCURLY : '}' ; -COLON : ':' ; -COMMA : ',' ; -//DOT : '.' ; -ASSIGN : '=' ; -EQUAL : "==" ; -LNOT : '!' ; -BNOT : '~' ; -NOT_EQUAL : "!=" ; -DIV : '/' ; -DIV_ASSIGN : "/=" ; -PLUS : '+' ; -PLUS_ASSIGN : "+=" ; -INC : "++" ; -MINUS : '-' ; -MINUS_ASSIGN : "-=" ; -DEC : "--" ; -STAR : '*' ; -STAR_ASSIGN : "*=" ; -MOD : '%' ; -MOD_ASSIGN : "%=" ; -SR : ">>" ; -SR_ASSIGN : ">>=" ; -BSR : ">>>" ; -BSR_ASSIGN : ">>>=" ; -GE : ">=" ; -GT : ">" ; -SL : "<<" ; -SL_ASSIGN : "<<=" ; -LE : "<=" ; -LT : '<' ; -BXOR : '^' ; -BXOR_ASSIGN : "^=" ; -BOR : '|' ; -BOR_ASSIGN : "|=" ; -LOR : "||" ; -BAND : '&' ; -BAND_ASSIGN : "&=" ; -LAND : "&&" ; -SEMI : ';' ; - - -// Whitespace -- ignored -WS : ( ' ' - | '\t' - | '\f' - // handle newlines - | ( options {generateAmbigWarnings=false;} - : "\r\n" // Evil DOS - | '\r' // Macintosh - | '\n' // Unix (the right way) - ) - { newline(); } - )+ - { _ttype = Token.SKIP; } - ; - -// Single-line comments -SL_COMMENT - : "//" - (~('\n'|'\r'))* ('\n'|'\r'('\n')?)? - {$setType(Token.SKIP); newline();} - ; - -// multiple-line comments -ML_COMMENT - : "/*" - ( /* '\r' '\n' can be matched in one alternative or by matching - '\r' in one iteration and '\n' in another. I am trying to - handle any flavor of newline that comes in, but the language - that allows both "\r\n" and "\r" and "\n" to all be valid - newline is ambiguous. Consequently, the resulting grammar - must be ambiguous. I'm shutting this warning off. - */ - options { - generateAmbigWarnings=false; - } - : - { LA(2)!='/' }? '*' - | '\r' '\n' {newline();} - | '\r' {newline();} - | '\n' {newline();} - | ~('*'|'\n'|'\r') - )* - "*/" - {$setType(Token.SKIP);} - ; - - -// character literals -CHAR_LITERAL - : '\'' ( ESC | ~('\''|'\n'|'\r'|'\\') ) '\'' - ; - -// string literals -STRING_LITERAL - : '"' (ESC|~('"'|'\\'|'\n'|'\r'))* '"' - ; - - -// escape sequence -- note that this is protected; it can only be called -// from another lexer rule -- it will not ever directly return a token to -// the parser -// There are various ambiguities hushed in this rule. The optional -// '0'...'9' digit matches should be matched here rather than letting -// them go back to STRING_LITERAL to be matched. ANTLR does the -// right thing by matching immediately; hence, it's ok to shut off -// the FOLLOW ambig warnings. -protected -ESC - : '\\' - ( 'n' - | 'r' - | 't' - | 'b' - | 'f' - | '"' - | '\'' - | '\\' - | ('u')+ HEX_DIGIT HEX_DIGIT HEX_DIGIT HEX_DIGIT - | '0'..'3' - ( - options { - warnWhenFollowAmbig = false; - } - : '0'..'7' - ( - options { - warnWhenFollowAmbig = false; - } - : '0'..'7' - )? - )? - | '4'..'7' - ( - options { - warnWhenFollowAmbig = false; - } - : '0'..'7' - )? - ) - ; - - -// hexadecimal digit (again, note it's protected!) -protected -HEX_DIGIT - : ('0'..'9'|'A'..'F'|'a'..'f') - ; - - -// an identifier. Note that testLiterals is set to true! This means -// that after we match the rule, we look in the literals table to see -// if it's a literal or really an identifer -IDENT - options {testLiterals=true;} - : ('a'..'z'|'A'..'Z'|'_'|'$') ('a'..'z'|'A'..'Z'|'_'|'0'..'9'|'$')* - ; - - -// a numeric literal -NUM_INT - {boolean isDecimal=false; Token t=null;} - : '.' {_ttype = DOT;} - ( ('0'..'9')+ (EXPONENT)? (f1:FLOAT_SUFFIX {t=f1;})? - { - if (t != null && t.getText().toUpperCase().indexOf('F')>=0) { - _ttype = NUM_FLOAT; - } - else { - _ttype = NUM_DOUBLE; // assume double - } - } - )? - - | ( '0' {isDecimal = true;} // special case for just '0' - ( ('x'|'X') - ( // hex - // the 'e'|'E' and float suffix stuff look - // like hex digits, hence the (...)+ doesn't - // know when to stop: ambig. ANTLR resolves - // it correctly by matching immediately. It - // is therefor ok to hush warning. - options { - warnWhenFollowAmbig=false; - } - : HEX_DIGIT - )+ - - | //float or double with leading zero - (('0'..'9')+ ('.'|EXPONENT|FLOAT_SUFFIX)) => ('0'..'9')+ - - | ('0'..'7')+ // octal - )? - | ('1'..'9') ('0'..'9')* {isDecimal=true;} // non-zero decimal - ) - ( ('l'|'L') { _ttype = NUM_LONG; } - - // only check to see if it's a float if looks like decimal so far - | {isDecimal}? - ( '.' ('0'..'9')* (EXPONENT)? (f2:FLOAT_SUFFIX {t=f2;})? - | EXPONENT (f3:FLOAT_SUFFIX {t=f3;})? - | f4:FLOAT_SUFFIX {t=f4;} - ) - { - if (t != null && t.getText().toUpperCase() .indexOf('F') >= 0) { - _ttype = NUM_FLOAT; - } - else { - _ttype = NUM_DOUBLE; // assume double - } - } - )? - ; - - -// a couple protected methods to assist in matching floating point numbers -protected -EXPONENT - : ('e'|'E') ('+'|'-')? ('0'..'9')+ - ; - - -protected -FLOAT_SUFFIX - : 'f'|'F'|'d'|'D' - ; - |