src/antlr/TokenStreamRewriteEngine.hpp

#ifndef INC_TokenStreamRewriteEngine_hpp__
#define INC_TokenStreamRewriteEngine_hpp__

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 */

#include <string>
#include <list>
#include <vector>
#include <map>
#include <utility>
#include <iostream>
#include <iterator>
#include <cassert>
#include <algorithm>

#include <antlr/config.hpp>

#include <antlr/TokenStream.hpp>
#include <antlr/TokenWithIndex.hpp>
#include <antlr/BitSet.hpp>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

/** This token stream tracks the *entire* token stream coming from
 *       a lexer, but does not pass on the whitespace (or whatever else
 *       you want to discard) to the parser.
 *
 *       This class can then be asked for the ith token in the input stream.
 *       Useful for dumping out the input stream exactly after doing some
 *       augmentation or other manipulations.   Tokens are index from 0..n-1
 *
 *       You can insert stuff, replace, and delete chunks.       Note that the
 *       operations are done lazily--only if you convert the buffer to a
 *       String.         This is very efficient because you are not moving data around
 *       all the time.   As the buffer of tokens is converted to strings, the
 *       toString() method(s) check to see if there is an operation at the
 *       current index.  If so, the operation is done and then normal String
 *       rendering continues on the buffer.      This is like having multiple Turing
 *       machine instruction streams (programs) operating on a single input tape. :)
 *
 *       Since the operations are done lazily at toString-time, operations do not
 *       screw up the token index values.  That is, an insert operation at token
 *       index i does not change the index values for tokens i+1..n-1.
 *
 *       Because operations never actually alter the buffer, you may always get
 *       the original token stream back without undoing anything.  Since
 *       the instructions are queued up, you can easily simulate transactions and
 *       roll back any changes if there is an error just by removing instructions.
 *       For example,
 *
 *                      TokenStreamRewriteEngine rewriteEngine =
 *                              new TokenStreamRewriteEngine(lexer);
 *                JavaRecognizer parser = new JavaRecognizer(rewriteEngine);
 *                ...
 *                rewriteEngine.insertAfter("pass1", t, "foobar");}
 *                      rewriteEngine.insertAfter("pass2", u, "start");}
 *                      System.out.println(rewriteEngine.toString("pass1"));
 *                      System.out.println(rewriteEngine.toString("pass2"));
 *
 *       You can also have multiple "instruction streams" and get multiple
 *       rewrites from a single pass over the input.     Just name the instruction
 *       streams and use that name again when printing the buffer.      This could be
 *       useful for generating a C file and also its header file--all from the
 *       same buffer.
 *
 *       If you don't use named rewrite streams, a "default" stream is used.
 *
 *       Terence Parr, parrt@cs.usfca.edu
 *       University of San Francisco
 *       February 2004
 */
class TokenStreamRewriteEngine : public TokenStream
{
public:
        typedef ANTLR_USE_NAMESPACE(std)vector<antlr::RefTokenWithIndex> token_list;
        static const char* DEFAULT_PROGRAM_NAME;
#ifndef NO_STATIC_CONSTS
        static const size_t MIN_TOKEN_INDEX;
        static const int PROGRAM_INIT_SIZE;
#else
        enum {
                MIN_TOKEN_INDEX = 0,
                PROGRAM_INIT_SIZE = 100
        };
#endif

        struct tokenToStream {
                tokenToStream( ANTLR_USE_NAMESPACE(std)ostream& o ) : out(o) {}
                template <typename T> void operator() ( const T& t ) {
                        out << t->getText();
                }
                ANTLR_USE_NAMESPACE(std)ostream& out;
        };

        class RewriteOperation {
        protected:
                RewriteOperation( size_t idx, const ANTLR_USE_NAMESPACE(std)string& txt )
                : index(idx), text(txt)
                {
                }
        public:
                virtual ~RewriteOperation()
                {
                }
                /** Execute the rewrite operation by possibly adding to the buffer.
                 *       Return the index of the next token to operate on.
                 */
                virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& /* out */ ) {
                        return index;
                }
                virtual size_t getIndex() const {
                        return index;
                }
                virtual const char* type() const {
                        return "RewriteOperation";
                }
        protected:
                size_t index;
                ANTLR_USE_NAMESPACE(std)string text;
        };

        struct executeOperation {
                ANTLR_USE_NAMESPACE(std)ostream& out;
                executeOperation( ANTLR_USE_NAMESPACE(std)ostream& s ) : out(s) {}
                void operator () ( RewriteOperation* t ) {
                        t->execute(out);
                }
        };

        /// list of rewrite operations
        typedef ANTLR_USE_NAMESPACE(std)list<RewriteOperation*> operation_list;
        /// map program name to <program counter,program> tuple
        typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,operation_list> program_map;

        class InsertBeforeOp : public RewriteOperation
        {
        public:
                InsertBeforeOp( size_t index, const ANTLR_USE_NAMESPACE(std)string& text )
                : RewriteOperation(index, text)
                {
                }
                virtual ~InsertBeforeOp() {}
                virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& out )
                {
                        out << text;
                        return index;
                }
                virtual const char* type() const {
                        return "InsertBeforeOp";
                }
        };

        class ReplaceOp : public RewriteOperation
        {
        public:
                ReplaceOp(size_t from, size_t to, ANTLR_USE_NAMESPACE(std)string text)
                : RewriteOperation(from,text)
                , lastIndex(to)
                {
                }
                virtual ~ReplaceOp() {}
                virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& out ) {
                        out << text;
                        return lastIndex+1;
                }
                virtual const char* type() const {
                        return "ReplaceOp";
                }
        protected:
                size_t lastIndex;
        };

        class DeleteOp : public ReplaceOp {
        public:
                DeleteOp(size_t from, size_t to)
                : ReplaceOp(from,to,"")
                {
                }
                virtual const char* type() const {
                        return "DeleteOp";
                }
        };

        TokenStreamRewriteEngine(TokenStream& upstream);

        TokenStreamRewriteEngine(TokenStream& upstream, size_t initialSize);

        RefToken nextToken( void );

        void rollback(size_t instructionIndex) {
                rollback(DEFAULT_PROGRAM_NAME, instructionIndex);
        }

        /** Rollback the instruction stream for a program so that
         *       the indicated instruction (via instructionIndex) is no
         *       longer in the stream.  UNTESTED!
         */
        void rollback(const ANTLR_USE_NAMESPACE(std)string& programName,
                                          size_t instructionIndex );

        void deleteProgram() {
                deleteProgram(DEFAULT_PROGRAM_NAME);
        }

        /** Reset the program so that no instructions exist */
        void deleteProgram(const ANTLR_USE_NAMESPACE(std)string& programName) {
                rollback(programName, MIN_TOKEN_INDEX);
        }

        void insertAfter( RefTokenWithIndex t,
                                                        const ANTLR_USE_NAMESPACE(std)string& text )
        {
                insertAfter(DEFAULT_PROGRAM_NAME, t, text);
        }

        void insertAfter(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) {
                insertAfter(DEFAULT_PROGRAM_NAME, index, text);
        }

        void insertAfter( const ANTLR_USE_NAMESPACE(std)string& programName,
                                                        RefTokenWithIndex t,
                                                        const ANTLR_USE_NAMESPACE(std)string& text )
        {
                insertAfter(programName, t->getIndex(), text);
        }

        void insertAfter( const ANTLR_USE_NAMESPACE(std)string& programName,
                                                        size_t index,
                                                        const ANTLR_USE_NAMESPACE(std)string& text )
        {
                // to insert after, just insert before next index (even if past end)
                insertBefore(programName,index+1, text);
        }

        void insertBefore( RefTokenWithIndex t,
                                                         const ANTLR_USE_NAMESPACE(std)string& text )
        {
                // std::cout << "insertBefore index " << t->getIndex() << " " << text << std::endl;
                insertBefore(DEFAULT_PROGRAM_NAME, t, text);
        }

        void insertBefore(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) {
                insertBefore(DEFAULT_PROGRAM_NAME, index, text);
        }

        void insertBefore( const ANTLR_USE_NAMESPACE(std)string& programName,
                                                         RefTokenWithIndex t,
                                                         const ANTLR_USE_NAMESPACE(std)string& text )
        {
                insertBefore(programName, t->getIndex(), text);
        }

        void insertBefore( const ANTLR_USE_NAMESPACE(std)string& programName,
                                                         size_t index,
                                                         const ANTLR_USE_NAMESPACE(std)string& text )
        {
                addToSortedRewriteList(programName, new InsertBeforeOp(index,text));
        }

        void replace(size_t index, const ANTLR_USE_NAMESPACE(std)string& text)
        {
                replace(DEFAULT_PROGRAM_NAME, index, index, text);
        }

        void replace( size_t from, size_t to,
                                          const ANTLR_USE_NAMESPACE(std)string& text)
        {
                replace(DEFAULT_PROGRAM_NAME, from, to, text);
        }

        void replace( RefTokenWithIndex indexT,
                                          const ANTLR_USE_NAMESPACE(std)string& text )
        {
                replace(DEFAULT_PROGRAM_NAME, indexT->getIndex(), indexT->getIndex(), text);
        }

        void replace( RefTokenWithIndex from,
                                          RefTokenWithIndex to,
                                          const ANTLR_USE_NAMESPACE(std)string& text )
        {
                replace(DEFAULT_PROGRAM_NAME, from, to, text);
        }

        void replace(const ANTLR_USE_NAMESPACE(std)string& programName,
                                         size_t from, size_t to,
                                         const ANTLR_USE_NAMESPACE(std)string& text )
        {
                addToSortedRewriteList(programName,new ReplaceOp(from, to, text));
        }

        void replace( const ANTLR_USE_NAMESPACE(std)string& programName,
                                          RefTokenWithIndex from,
                                          RefTokenWithIndex to,
                                          const ANTLR_USE_NAMESPACE(std)string& text )
        {
                replace(programName,
                                  from->getIndex(),
                                  to->getIndex(),
                                  text);
        }

        void remove(size_t index) {
                remove(DEFAULT_PROGRAM_NAME, index, index);
        }

        void remove(size_t from, size_t to) {
                remove(DEFAULT_PROGRAM_NAME, from, to);
        }

        void remove(RefTokenWithIndex indexT) {
                remove(DEFAULT_PROGRAM_NAME, indexT, indexT);
        }

        void remove(RefTokenWithIndex from, RefTokenWithIndex to) {
                remove(DEFAULT_PROGRAM_NAME, from, to);
        }

        void remove( const ANTLR_USE_NAMESPACE(std)string& programName,
                                         size_t from, size_t to)
        {
                replace(programName,from,to,"");
        }

        void remove( const ANTLR_USE_NAMESPACE(std)string& programName,
                                         RefTokenWithIndex from, RefTokenWithIndex to )
        {
                replace(programName,from,to,"");
        }

        void discard(int ttype) {
                discardMask.add(ttype);
        }

        RefToken getToken( size_t i )
        {
                return RefToken(tokens.at(i));
        }

        size_t getTokenStreamSize() const {
                return tokens.size();
        }

        void originalToStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const {
                ANTLR_USE_NAMESPACE(std)for_each( tokens.begin(), tokens.end(), tokenToStream(out) );
        }

        void originalToStream( ANTLR_USE_NAMESPACE(std)ostream& out,
                                                                  size_t start, size_t end ) const;

        void toStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const {
                toStream( out, MIN_TOKEN_INDEX, getTokenStreamSize());
        }

        void toStream( ANTLR_USE_NAMESPACE(std)ostream& out,
                                                const ANTLR_USE_NAMESPACE(std)string& programName ) const
        {
                toStream( out, programName, MIN_TOKEN_INDEX, getTokenStreamSize());
        }

        void toStream( ANTLR_USE_NAMESPACE(std)ostream& out,
                                                size_t start, size_t end ) const
        {
                toStream(out, DEFAULT_PROGRAM_NAME, start, end);
        }

        void toStream( ANTLR_USE_NAMESPACE(std)ostream& out,
                                                const ANTLR_USE_NAMESPACE(std)string& programName,
                                                size_t firstToken, size_t lastToken ) const;

        void toDebugStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const {
                toDebugStream( out, MIN_TOKEN_INDEX, getTokenStreamSize());
        }

        void toDebugStream( ANTLR_USE_NAMESPACE(std)ostream& out,
                                                          size_t start, size_t end ) const;

        size_t getLastRewriteTokenIndex() const {
                return getLastRewriteTokenIndex(DEFAULT_PROGRAM_NAME);
        }

        /** Return the last index for the program named programName
         * return 0 if the program does not exist or the program is empty.
         * (Note this is different from the java implementation that returns -1)
         */
        size_t getLastRewriteTokenIndex(const ANTLR_USE_NAMESPACE(std)string& programName) const {
                program_map::const_iterator rewrites = programs.find(programName);

                if( rewrites == programs.end() )
                        return 0;

                const operation_list& prog = rewrites->second;
                if( !prog.empty() )
                {
                        operation_list::const_iterator last = prog.end();
                        --last;
                        return (*last)->getIndex();
                }
                return 0;
        }

protected:
        /** If op.index > lastRewriteTokenIndexes, just add to the end.
         *       Otherwise, do linear */
        void addToSortedRewriteList(RewriteOperation* op) {
                addToSortedRewriteList(DEFAULT_PROGRAM_NAME, op);
        }

        void addToSortedRewriteList( const ANTLR_USE_NAMESPACE(std)string& programName,
                                                                                  RewriteOperation* op );

protected:
        /** Who do we suck tokens from? */
        TokenStream& stream;
        /** track index of tokens */
        size_t index;

        /** Track the incoming list of tokens */
        token_list tokens;

        /** You may have multiple, named streams of rewrite operations.
         *  I'm calling these things "programs."
         *  Maps String (name) -> rewrite (List)
         */
        program_map programs;

        /** Which (whitespace) token(s) to throw out */
        BitSet discardMask;
};

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif
Revision:	1558
Committed:	Wed May 11 16:32:48 2011 UTC (13 years, 11 months ago) by gezelter
File size:	12588 byte(s)
Log Message:	Updated antlr, some minor formatting changes
#	User	Rev	Content
1	tim	770	#ifndef INC_TokenStreamRewriteEngine_hpp__
2			#define INC_TokenStreamRewriteEngine_hpp__
3
4			/* ANTLR Translator Generator
5			* Project led by Terence Parr at http://www.jGuru.com
6			* Software rights: http://www.antlr.org/license.html
7			*/
8
9			#include <string>
10			#include <list>
11			#include <vector>
12			#include <map>
13			#include <utility>
14			#include <iostream>
15			#include <iterator>
16			#include <cassert>
17			#include <algorithm>
18
19			#include <antlr/config.hpp>
20
21			#include <antlr/TokenStream.hpp>
22			#include <antlr/TokenWithIndex.hpp>
23			#include <antlr/BitSet.hpp>
24
25			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
26			namespace antlr {
27			#endif
28
29			/** This token stream tracks the entire token stream coming from
30	gezelter	1558	* a lexer, but does not pass on the whitespace (or whatever else
31			* you want to discard) to the parser.
32	tim	770	*
33	gezelter	1558	* This class can then be asked for the ith token in the input stream.
34			* Useful for dumping out the input stream exactly after doing some
35			* augmentation or other manipulations. Tokens are index from 0..n-1
36	tim	770	*
37	gezelter	1558	* You can insert stuff, replace, and delete chunks. Note that the
38			* operations are done lazily--only if you convert the buffer to a
39			* String. This is very efficient because you are not moving data around
40			* all the time. As the buffer of tokens is converted to strings, the
41			* toString() method(s) check to see if there is an operation at the
42			* current index. If so, the operation is done and then normal String
43			* rendering continues on the buffer. This is like having multiple Turing
44			* machine instruction streams (programs) operating on a single input tape. :)
45	tim	770	*
46	gezelter	1558	* Since the operations are done lazily at toString-time, operations do not
47			* screw up the token index values. That is, an insert operation at token
48			* index i does not change the index values for tokens i+1..n-1.
49	tim	770	*
50	gezelter	1558	* Because operations never actually alter the buffer, you may always get
51			* the original token stream back without undoing anything. Since
52			* the instructions are queued up, you can easily simulate transactions and
53			* roll back any changes if there is an error just by removing instructions.
54			* For example,
55	tim	770	*
56	gezelter	1558	* TokenStreamRewriteEngine rewriteEngine =
57			* new TokenStreamRewriteEngine(lexer);
58			* JavaRecognizer parser = new JavaRecognizer(rewriteEngine);
59			* ...
60			* rewriteEngine.insertAfter("pass1", t, "foobar");}
61			* rewriteEngine.insertAfter("pass2", u, "start");}
62			* System.out.println(rewriteEngine.toString("pass1"));
63			* System.out.println(rewriteEngine.toString("pass2"));
64	tim	770	*
65	gezelter	1558	* You can also have multiple "instruction streams" and get multiple
66			* rewrites from a single pass over the input. Just name the instruction
67			* streams and use that name again when printing the buffer. This could be
68			* useful for generating a C file and also its header file--all from the
69			* same buffer.
70	tim	770	*
71	gezelter	1558	* If you don't use named rewrite streams, a "default" stream is used.
72	tim	770	*
73	gezelter	1558	* Terence Parr, parrt@cs.usfca.edu
74			* University of San Francisco
75			* February 2004
76	tim	770	*/
77			class TokenStreamRewriteEngine : public TokenStream
78			{
79			public:
80			typedef ANTLR_USE_NAMESPACE(std)vector<antlr::RefTokenWithIndex> token_list;
81			static const char* DEFAULT_PROGRAM_NAME;
82	gezelter	1558	#ifndef NO_STATIC_CONSTS
83			static const size_t MIN_TOKEN_INDEX;
84			static const int PROGRAM_INIT_SIZE;
85			#else
86			enum {
87			MIN_TOKEN_INDEX = 0,
88			PROGRAM_INIT_SIZE = 100
89			};
90			#endif
91	tim	770
92			struct tokenToStream {
93			tokenToStream( ANTLR_USE_NAMESPACE(std)ostream& o ) : out(o) {}
94			template <typename T> void operator() ( const T& t ) {
95			out << t->getText();
96			}
97			ANTLR_USE_NAMESPACE(std)ostream& out;
98			};
99
100			class RewriteOperation {
101			protected:
102			RewriteOperation( size_t idx, const ANTLR_USE_NAMESPACE(std)string& txt )
103			: index(idx), text(txt)
104			{
105			}
106			public:
107			virtual ~RewriteOperation()
108			{
109			}
110			/** Execute the rewrite operation by possibly adding to the buffer.
111	gezelter	1558	* Return the index of the next token to operate on.
112	tim	770	*/
113			virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& /* out */ ) {
114			return index;
115			}
116			virtual size_t getIndex() const {
117			return index;
118			}
119			virtual const char* type() const {
120			return "RewriteOperation";
121			}
122			protected:
123			size_t index;
124			ANTLR_USE_NAMESPACE(std)string text;
125			};
126
127			struct executeOperation {
128			ANTLR_USE_NAMESPACE(std)ostream& out;
129			executeOperation( ANTLR_USE_NAMESPACE(std)ostream& s ) : out(s) {}
130			void operator () ( RewriteOperation* t ) {
131			t->execute(out);
132			}
133			};
134
135			/// list of rewrite operations
136			typedef ANTLR_USE_NAMESPACE(std)list<RewriteOperation*> operation_list;
137			/// map program name to <program counter,program> tuple
138			typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,operation_list> program_map;
139
140			class InsertBeforeOp : public RewriteOperation
141			{
142			public:
143			InsertBeforeOp( size_t index, const ANTLR_USE_NAMESPACE(std)string& text )
144			: RewriteOperation(index, text)
145			{
146			}
147			virtual ~InsertBeforeOp() {}
148			virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& out )
149			{
150			out << text;
151			return index;
152			}
153			virtual const char* type() const {
154			return "InsertBeforeOp";
155			}
156			};
157
158			class ReplaceOp : public RewriteOperation
159			{
160			public:
161			ReplaceOp(size_t from, size_t to, ANTLR_USE_NAMESPACE(std)string text)
162			: RewriteOperation(from,text)
163			, lastIndex(to)
164			{
165			}
166			virtual ~ReplaceOp() {}
167			virtual size_t execute( ANTLR_USE_NAMESPACE(std)ostream& out ) {
168			out << text;
169			return lastIndex+1;
170			}
171			virtual const char* type() const {
172			return "ReplaceOp";
173			}
174			protected:
175			size_t lastIndex;
176			};
177
178			class DeleteOp : public ReplaceOp {
179			public:
180			DeleteOp(size_t from, size_t to)
181			: ReplaceOp(from,to,"")
182			{
183			}
184			virtual const char* type() const {
185			return "DeleteOp";
186			}
187			};
188
189			TokenStreamRewriteEngine(TokenStream& upstream);
190
191			TokenStreamRewriteEngine(TokenStream& upstream, size_t initialSize);
192
193			RefToken nextToken( void );
194
195			void rollback(size_t instructionIndex) {
196			rollback(DEFAULT_PROGRAM_NAME, instructionIndex);
197			}
198
199			/** Rollback the instruction stream for a program so that
200	gezelter	1558	* the indicated instruction (via instructionIndex) is no
201			* longer in the stream. UNTESTED!
202	tim	770	*/
203			void rollback(const ANTLR_USE_NAMESPACE(std)string& programName,
204			size_t instructionIndex );
205
206			void deleteProgram() {
207			deleteProgram(DEFAULT_PROGRAM_NAME);
208			}
209
210			/** Reset the program so that no instructions exist */
211			void deleteProgram(const ANTLR_USE_NAMESPACE(std)string& programName) {
212			rollback(programName, MIN_TOKEN_INDEX);
213			}
214
215			void insertAfter( RefTokenWithIndex t,
216			const ANTLR_USE_NAMESPACE(std)string& text )
217			{
218			insertAfter(DEFAULT_PROGRAM_NAME, t, text);
219			}
220
221			void insertAfter(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) {
222			insertAfter(DEFAULT_PROGRAM_NAME, index, text);
223			}
224
225			void insertAfter( const ANTLR_USE_NAMESPACE(std)string& programName,
226			RefTokenWithIndex t,
227			const ANTLR_USE_NAMESPACE(std)string& text )
228			{
229			insertAfter(programName, t->getIndex(), text);
230			}
231
232			void insertAfter( const ANTLR_USE_NAMESPACE(std)string& programName,
233	gezelter	1558	size_t index,
234	tim	770	const ANTLR_USE_NAMESPACE(std)string& text )
235			{
236			// to insert after, just insert before next index (even if past end)
237			insertBefore(programName,index+1, text);
238			}
239
240			void insertBefore( RefTokenWithIndex t,
241			const ANTLR_USE_NAMESPACE(std)string& text )
242			{
243			// std::cout << "insertBefore index " << t->getIndex() << " " << text << std::endl;
244			insertBefore(DEFAULT_PROGRAM_NAME, t, text);
245			}
246
247			void insertBefore(size_t index, const ANTLR_USE_NAMESPACE(std)string& text) {
248			insertBefore(DEFAULT_PROGRAM_NAME, index, text);
249			}
250
251			void insertBefore( const ANTLR_USE_NAMESPACE(std)string& programName,
252			RefTokenWithIndex t,
253			const ANTLR_USE_NAMESPACE(std)string& text )
254			{
255			insertBefore(programName, t->getIndex(), text);
256			}
257
258			void insertBefore( const ANTLR_USE_NAMESPACE(std)string& programName,
259			size_t index,
260			const ANTLR_USE_NAMESPACE(std)string& text )
261			{
262			addToSortedRewriteList(programName, new InsertBeforeOp(index,text));
263			}
264
265			void replace(size_t index, const ANTLR_USE_NAMESPACE(std)string& text)
266			{
267			replace(DEFAULT_PROGRAM_NAME, index, index, text);
268			}
269
270			void replace( size_t from, size_t to,
271			const ANTLR_USE_NAMESPACE(std)string& text)
272			{
273			replace(DEFAULT_PROGRAM_NAME, from, to, text);
274			}
275
276			void replace( RefTokenWithIndex indexT,
277			const ANTLR_USE_NAMESPACE(std)string& text )
278			{
279			replace(DEFAULT_PROGRAM_NAME, indexT->getIndex(), indexT->getIndex(), text);
280			}
281
282			void replace( RefTokenWithIndex from,
283			RefTokenWithIndex to,
284			const ANTLR_USE_NAMESPACE(std)string& text )
285			{
286			replace(DEFAULT_PROGRAM_NAME, from, to, text);
287			}
288
289			void replace(const ANTLR_USE_NAMESPACE(std)string& programName,
290			size_t from, size_t to,
291			const ANTLR_USE_NAMESPACE(std)string& text )
292			{
293			addToSortedRewriteList(programName,new ReplaceOp(from, to, text));
294			}
295
296			void replace( const ANTLR_USE_NAMESPACE(std)string& programName,
297			RefTokenWithIndex from,
298			RefTokenWithIndex to,
299			const ANTLR_USE_NAMESPACE(std)string& text )
300			{
301			replace(programName,
302			from->getIndex(),
303			to->getIndex(),
304			text);
305			}
306
307			void remove(size_t index) {
308			remove(DEFAULT_PROGRAM_NAME, index, index);
309			}
310
311			void remove(size_t from, size_t to) {
312			remove(DEFAULT_PROGRAM_NAME, from, to);
313			}
314
315			void remove(RefTokenWithIndex indexT) {
316			remove(DEFAULT_PROGRAM_NAME, indexT, indexT);
317			}
318
319			void remove(RefTokenWithIndex from, RefTokenWithIndex to) {
320			remove(DEFAULT_PROGRAM_NAME, from, to);
321			}
322
323			void remove( const ANTLR_USE_NAMESPACE(std)string& programName,
324			size_t from, size_t to)
325			{
326			replace(programName,from,to,"");
327			}
328
329			void remove( const ANTLR_USE_NAMESPACE(std)string& programName,
330			RefTokenWithIndex from, RefTokenWithIndex to )
331			{
332			replace(programName,from,to,"");
333			}
334
335			void discard(int ttype) {
336			discardMask.add(ttype);
337			}
338
339			RefToken getToken( size_t i )
340			{
341			return RefToken(tokens.at(i));
342			}
343
344			size_t getTokenStreamSize() const {
345			return tokens.size();
346			}
347
348			void originalToStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const {
349			ANTLR_USE_NAMESPACE(std)for_each( tokens.begin(), tokens.end(), tokenToStream(out) );
350			}
351
352			void originalToStream( ANTLR_USE_NAMESPACE(std)ostream& out,
353			size_t start, size_t end ) const;
354
355			void toStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const {
356	gezelter	1558	toStream( out, MIN_TOKEN_INDEX, getTokenStreamSize());
357	tim	770	}
358
359			void toStream( ANTLR_USE_NAMESPACE(std)ostream& out,
360			const ANTLR_USE_NAMESPACE(std)string& programName ) const
361			{
362	gezelter	1558	toStream( out, programName, MIN_TOKEN_INDEX, getTokenStreamSize());
363	tim	770	}
364
365			void toStream( ANTLR_USE_NAMESPACE(std)ostream& out,
366			size_t start, size_t end ) const
367			{
368	gezelter	1558	toStream(out, DEFAULT_PROGRAM_NAME, start, end);
369	tim	770	}
370
371			void toStream( ANTLR_USE_NAMESPACE(std)ostream& out,
372			const ANTLR_USE_NAMESPACE(std)string& programName,
373			size_t firstToken, size_t lastToken ) const;
374
375			void toDebugStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const {
376	gezelter	1558	toDebugStream( out, MIN_TOKEN_INDEX, getTokenStreamSize());
377	tim	770	}
378
379			void toDebugStream( ANTLR_USE_NAMESPACE(std)ostream& out,
380			size_t start, size_t end ) const;
381
382			size_t getLastRewriteTokenIndex() const {
383			return getLastRewriteTokenIndex(DEFAULT_PROGRAM_NAME);
384			}
385
386			/** Return the last index for the program named programName
387			* return 0 if the program does not exist or the program is empty.
388			* (Note this is different from the java implementation that returns -1)
389			*/
390			size_t getLastRewriteTokenIndex(const ANTLR_USE_NAMESPACE(std)string& programName) const {
391			program_map::const_iterator rewrites = programs.find(programName);
392
393			if( rewrites == programs.end() )
394			return 0;
395
396			const operation_list& prog = rewrites->second;
397			if( !prog.empty() )
398			{
399			operation_list::const_iterator last = prog.end();
400			--last;
401			return (*last)->getIndex();
402			}
403			return 0;
404			}
405
406			protected:
407			/** If op.index > lastRewriteTokenIndexes, just add to the end.
408	gezelter	1558	* Otherwise, do linear */
409	tim	770	void addToSortedRewriteList(RewriteOperation* op) {
410			addToSortedRewriteList(DEFAULT_PROGRAM_NAME, op);
411			}
412
413			void addToSortedRewriteList( const ANTLR_USE_NAMESPACE(std)string& programName,
414			RewriteOperation* op );
415
416			protected:
417			/** Who do we suck tokens from? */
418			TokenStream& stream;
419			/** track index of tokens */
420			size_t index;
421
422			/** Track the incoming list of tokens */
423			token_list tokens;
424
425			/** You may have multiple, named streams of rewrite operations.
426			* I'm calling these things "programs."
427			* Maps String (name) -> rewrite (List)
428			*/
429			program_map programs;
430
431			/** Which (whitespace) token(s) to throw out */
432			BitSet discardMask;
433			};
434
435			#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
436			}
437			#endif
438
439			#endif