ragel/rlscan.h

   1 /*
   2  *  Copyright 2007 Adrian Thurston <thurston@cs.queensu.ca>
   3  */
   4
   5 /*  This file is part of Ragel.
   6  *
   7  *  Ragel is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  Ragel is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with Ragel; if not, write to the Free Software
  19  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #ifndef _RLSCAN_H
  23 #define _RLSCAN_H
  24
  25 #include <iostream>
  26 #include "rlscan.h"
  27 #include "vector.h"
  28 #include "rlparse.h"
  29 #include "parsedata.h"
  30 #include "avltree.h"
  31 #include "vector.h"
  32
  33 using std::istream;
  34 using std::ostream;
  35
  36 extern char *Parser_lelNames[];
  37
  38 /* This is used for tracking the current stack of include file/machine pairs. It is
  39  * is used to detect and recursive include structure. */
  40 struct IncludeStackItem
  41 {
  42         IncludeStackItem( char *fileName, char *sectionName )
  43                 : fileName(fileName), sectionName(sectionName) {}
  44
  45         char *fileName;
  46         char *sectionName;
  47 };
  48
  49 typedef Vector<IncludeStackItem> IncludeStack;
  50
  51 struct Scanner
  52 {
  53         Scanner( char *fileName, istream &input, ostream &output,
  54                         Parser *inclToParser, char *inclSectionTarg,
  55                         int includeDepth, bool importMachines )
  56         :
  57                 fileName(fileName), input(input), output(output),
  58                 inclToParser(inclToParser),
  59                 inclSectionTarg(inclSectionTarg),
  60                 includeDepth(includeDepth),
  61                 importMachines(importMachines),
  62                 cur_token(0),
  63                 line(1), column(1), lastnl(0),
  64                 parser(0), ignoreSection(false),
  65                 parserExistsError(false),
  66                 whitespaceOn(true),
  67                 lastToken(0)
  68                 {}
  69
  70         bool recursiveInclude( char *inclFileName, char *inclSectionName );
  71
  72         char *prepareFileName( char *fileName, int len )
  73         {
  74                 bool caseInsensitive;
  75                 Token tokenFnStr, tokenRes;
  76                 tokenFnStr.data = fileName;
  77                 tokenFnStr.length = len;
  78                 tokenFnStr.prepareLitString( tokenRes, caseInsensitive );
  79                 return tokenRes.data;
  80         }
  81
  82         void init();
  83         void token( int type, char *start, char *end );
  84         void token( int type, char c );
  85         void token( int type );
  86         void processToken( int type, char *tokdata, int toklen );
  87         void directToParser( Parser *toParser, char *tokFileName, int tokLine,
  88                 int tokColumn, int type, char *tokdata, int toklen );
  89         void flushImport( );
  90         void importToken( int type, char *start, char *end );
  91         void pass( int token, char *start, char *end );
  92         void pass();
  93         void updateCol();
  94         void startSection();
  95         void endSection();
  96         void do_scan();
  97         bool active();
  98         ostream &scan_error();
  99
 100         char *fileName;
 101         istream &input;
 102         ostream &output;
 103         Parser *inclToParser;
 104         char *inclSectionTarg;
 105         int includeDepth;
 106         bool importMachines;
 107
 108         /* For import parsing. */
 109         int tok_cs, tok_act;
 110         int *tok_ts, *tok_te;
 111         int cur_token;
 112         static const int max_tokens = 32;
 113         int token_data[max_tokens];
 114         char *token_strings[max_tokens];
 115         int token_lens[max_tokens];
 116
 117         /* For section processing. */
 118         int cs;
 119         char *word, *lit;
 120         int word_len, lit_len;
 121
 122         /* For character scanning. */
 123         int line;
 124         InputLoc sectionLoc;
 125         char *ts, *te;
 126         int column;
 127         char *lastnl;
 128
 129         /* Set by machine statements, these persist from section to section
 130          * allowing for unnamed sections. */
 131         Parser *parser;
 132         bool ignoreSection;
 133         IncludeStack includeStack;
 134
 135         /* This is set if ragel has already emitted an error stating that
 136          * no section name has been seen and thus no parser exists. */
 137         bool parserExistsError;
 138
 139         /* This is for inline code. By default it is on. It goes off for
 140          * statements and values in inline blocks which are parsed. */
 141         bool whitespaceOn;
 142
 143         /* Keeps a record of the previous token sent to the section parser. */
 144         int lastToken;
 145 };
 146
 147 #endif /* _RLSCAN_H */