changes_from_133.txt

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    If there is demand, a similar routine for follow sets can be added.

#247. (MR21) Misleading error message on syntax error for optional elements.

    Prior to MR21, tokens which were optional did not appear in syntax
    error messages if the block which immediately followed detected a 
    syntax error.

    Consider the following grammar which accepts Number, Word, and Other:

            rr : {Number} Word;

    For this rule the code resembles:

            if (LA(1) == Number) {
                match(Number);
                consume();
            }
            match(Word);

    Prior to MR21, the error message for input "$ a" would be:

            line 1: syntax error at "$" missing Word

    With MR21 the message will be:

            line 1: syntax error at "$" expecting Word, Number.

    The generate code resembles:

            if ( (LA(1)==Number) ) {
                zzmatch(Number);
                consume();
            }
            else {
                if ( (LA(1)==Word) ) {
                    /* nothing */
                }
                else {
                    FAIL(... message for both Number and Word ...);
                }
            }
            match(Word);
        
    The code generated for optional blocks in MR21 is slightly longer
    than the previous versions, but it should give better error messages.

    The code generated for:

            { a | b | c }

    should now be *identical* to:

            ( a | b | c | )

    which was not the case prior to MR21.

    Reported by Sue Marvin ([e-mail]).

#246. (Changed in MR21) Use of $(MAKE) for calls to make

    Calls to make from the makefiles were replaced with $(MAKE)
    because of problems when using gmake.

    Reported with fix by Sunil K.Vallamkonda ([e-mail]).

#245. (Changed in MR21) Changes to genmk

    The following command line options have been added to genmk:

        -cfiles ... 
            
            To add a user's C or C++ files into makefile automatically.
            The list of files must be enclosed in apostrophes.  This
            option may be specified multiple times.

        -compiler ...
    
            The name of the compiler to use for $(CCC) or $(CC).  The
            default in C++ mode is "CC".  The default in C mode is "cc".

        -pccts_path ...

            The value for $(PCCTS), the pccts directory.  The default
            is /usr/local/pccts.

    Contributed by Tomasz Babczynski ([e-mail]).

#244. (Changed in MR21) Rename variable "not" in antlr.g

    When antlr.g is compiled with a C++ compiler, a variable named
    "not" causes problems.  Reported by Sinan Karasu
    ([e-mail]).

#243  (Changed in MR21) Replace recursion with iteration in zzfree_ast

    Another refinement to zzfree_ast in ast.c to limit recursion.

    NAKAJIMA Mutsuki ([e-mail]).


#242.  (Changed in MR21) LineInfoFormatStr

    Added an #ifndef/#endif around LineInfoFormatStr in pcctscfg.h.

#241. (Changed in MR21) Changed macro PURIFY to a no-op

                ***********************
                *** NOT IMPLEMENTED ***
                ***********************

        The PURIFY macro was changed to a no-op because it was causing 
        problems when passing C++ objects.
    
        The old definition:
    
            #define PURIFY(r,s)     memset((char *) &(r),'\\0',(s));
    
        The new definition:
    
            #define PURIFY(r,s)     /* nothing */
#endif

#240. (Changed in MR21) sorcerer/h/sorcerer.h _MATCH and _MATCHRANGE

    Added test for NULL token pointer.

    Suggested by Peter Keller ([e-mail])

#239. (Changed in MR21) C++ mode AParser::traceGuessFail

    If tracing is turned on when the code has been generated
    without trace code, a failed guess generates a trace report
    even though there are no other trace reports.  This
    make the behavior consistent with other parts of the
    trace system.

    Reported by David Wigg ([e-mail]).

#238. (Changed in MR21) Namespace version #include files

    Changed reference from CStdio to cstdio (and other
    #include file names) in the namespace version of pccts.
    Should have known better.

#237. (Changed in MR21) ParserBlackBox(FILE*)
    
    In the past, ParserBlackBox would close the FILE in the dtor
    even though it was not opened by ParserBlackBox.  The problem
    is that there were two constructors, one which accepted a file   
    name and did an fopen, the other which accepted a FILE and did
    not do an fopen.  There is now an extra member variable which
    remembers whether ParserBlackBox did the open or not.

    Suggested by Mike Percy ([e-mail]).

#236. (Changed in MR21) tmake now reports down pointer problem

    When ASTBase::tmake attempts to update the down pointer of 
    an AST it checks to see if the down pointer is NULL.  If it
    is not NULL it does not do the update and returns NULL.
    An attempt to update the down pointer is almost always a
    result of a user error.  This can lead to difficult to find
    problems during tree construction.

    With this change, the routine calls a virtual function
    reportOverwriteOfDownPointer() which calls panic to
    report the problem.  Users who want the old behavior can
    redefined the virtual function in their AST class.

    Suggested by Sinan Karasu ([e-mail])

#235. (Changed in MR21) Made ANTLRParser::resynch() virtual

    Suggested by Jerry Evans ([e-mail]).

#234. (Changed in MR21) Implicit int for function return value

    ATokenBuffer:bufferSize() did not specify a type for the
    return value.

    Reported by Hai Vo-Ba ([e-mail]).

#233. (Changed in MR20) Converted to MSVC 6.0

    Due to external circumstances I have had to convert to MSVC 6.0
    The MSVC 5.0 project files (.dsw and .dsp) have been retained as
    xxx50.dsp and xxx50.dsw.  The MSVC 6.0 files are named xxx60.dsp
    and xxx60.dsw (where xxx is the related to the directory/project).

#232. (Changed in MR20) Make setwd bit vectors protected in parser.h

    The access for the setwd array in the parser header was not
    specified.  As a result, it would depend on the code which 
    preceded it.  In MR20 it will always have access "protected".

    Reported by Piotr Eljasiak ([e-mail]).

#231. (Changed in MR20) Error in token buffer debug code.

    When token buffer debugging is selected via the pre-processor
    symbol DEBUG_TOKENBUFFER there is an erroneous check in
    AParser.cpp:

        #ifdef DEBUG_TOKENBUFFER
            if (i >= inputTokens->bufferSize() ||
                inputTokens->minTokens() < LLk )     /* MR20 Was "<=" */
        ...
        #endif

    Reported by David Wigg ([e-mail]).

#230. (Changed in MR20) Fixed problem with #define for -gd option

    There was an error in setting zzTRACE_RULES for the -gd (trace) option.

    Reported by Gary Funck ([e-mail]).

#229. (Changed in MR20) Additional "const" for literals

    "const" was added to the token name literal table.
    "const" was added to some panic() and similar routine

#228. (Changed in MR20) dlg crashes on "()"

    The following token defintion will cause DLG to crash.

        #token "()"

    When there is a syntax error in a regular expression
    many of the dlg routines return a structure which has
    null pointers.  When this is accessed by callers it
    generates the crash.

    I have attempted to fix the more common cases.

    Reported by  Mengue Olivier ([e-mail]).

#227. (Changed in MR20) Array overwrite

    Steveh Hand ([e-mail]) reported a problem which
    was traced to a temporary array which was not properly
    resized for deeply nested blocks.  This has been fixed.

#226. (Changed in MR20) -pedantic conformance
   
    G. Hobbelt ([e-mail]) and THM made many, many minor 
    changes to create prototypes for all the functions and
    bring antlr, dlg, and sorcerer into conformance with
    the gcc -pedantic option.

    This may require uses to add pccts/h/pcctscfg.h to some
    files or makefiles in order to have __USE_PROTOS defined.

#225  (Changed in MR20) AST stack adjustment in C mode

    The fix in #214 for AST stack adjustment in C mode missed 
    some cases.

    Reported with fix by Ger Hobbelt ([e-mail]).

#224  (Changed in MR20) LL(1) and LL(2) with #pragma approx

    This may take a record for the oldest, most trival, lexical
    error in pccts.  The regular expressions for LL(1) and LL(2)
    lacked an escape for the left and right parenthesis.

    Reported by Ger Hobbelt ([e-mail]).

#223  (Changed in MR20) Addition of IBM_VISUAL_AGE directory

    Build files for antlr, dlg, and sorcerer under IBM Visual Age 
    have been contributed by Anton Sergeev ([e-mail]).  They have
    been placed in the pccts/IBM_VISUAL_AGE directory.

#222  (Changed in MR20) Replace __STDC__ with __USE_PROTOS

    Most occurrences of __STDC__ replaced with __USE_PROTOS due to
    complaints from several users.

#221  (Changed in MR20) Added #include for DLexerBase.h to PBlackBox.

    Added #include for DLexerBase.h to PBlackBox.

#220  (Changed in MR19) strcat arguments reversed in #pred parse

    The arguments to strcat are reversed when creating a print
    name for a hash table entry for use with #pred feature.

    Problem diagnosed and fix reported by Scott Harrington 
    ([e-mail]).

#219. (Changed in MR19) C Mode routine zzfree_ast

    Changes to reduce use of recursion for AST trees with only right
    links or only left links in the C mode routine zzfree_ast.

    Implemented by SAKAI Kiyotaka ([e-mail]).

#218. (Changed in MR19) Changes to support unsigned char in C mode

    Changes to antlr.h and err.h to fix omissions in use of zzchar_t

    Implemented by SAKAI Kiyotaka ([e-mail]).

#217. (Changed in MR19) Error message when dlg -i and -CC options selected
    
    *** This change was rescinded by item #257 ***

    The parsers generated by pccts in C++ mode are not able to support the
    interactive lexer option (except, perhaps, when using the deferred fetch
    parser option.(Item #216).

    DLG now warns when both -i and -CC are selected.

    This warning was suggested by David Venditti ([e-mail]).

#216. (Changed in MR19) Defer token fetch for C++ mode

    Implemented by Volker H. Simonis ([e-mail])

    Normally, pccts keeps the lookahead token buffer completely filled.
    This requires max(k,ck) tokens of lookahead.  For some applications
    this can cause deadlock problems.  For example, there may be cases
    when the parser can't tell when the input has been completely consumed
    until the parse is complete, but the parse can't be completed because 
    the input routines are waiting for additional tokens to fill the
    lookahead buffer.
    
    When the ANTLRParser class is built with the pre-processor option 
    ZZDEFER_FETCH defined, the fetch of new tokens by consume() is deferred
    until LA(i) or LT(i) is called. 

    To test whether this option has been built into the ANTLRParser class
    use "isDeferFetchEnabled()".

    Using the -gd trace option with the default tracein() and traceout()
    routines will defeat the effort to defer the fetch because the
    trace routines print out information about the lookahead token at
    the start of the rule.
    
    Because the tracein and traceout routines are virtual it is 
    easy to redefine them in your parser:

        class MyParser {
        <<
            virtual void tracein(ANTLRChar * ruleName)
                { fprintf(stderr,"Entering: %s\n", ruleName); }
            virtual void traceout(ANTLRChar * ruleName)
                { fprintf(stderr,"Leaving: %s\n", ruleName); }
        >>
 
    The originals for those routines are pccts/h/AParser.cpp