src/lexer.l

   1 /* GOB C Preprocessor
   2  * Copyright (C) 1999 the Free Software Foundation.
   3  *
   4  * Author: George Lebl
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the  Free Software
  18  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  19  * USA.
  20  */
  21 %{
  22
  23 #include <glib.h>
  24
  25 #include "y.tab.h"
  26
  27 static int parenth_depth = 0;
  28 static int before_comment = INITIAL;
  29 static int class_after_c = FALSE;
  30 static int header_c = FALSE;
  31
  32 static GString *cbuf = NULL;
  33
  34 int line_no = 1;
  35
  36 static void
  37 clear_cbuf(void)
  38 {
  39         if(!cbuf) {
  40                 cbuf = g_string_new("");
  41         } else {
  42                 cbuf = g_string_assign(cbuf,"");
  43         }
  44 }
  45
  46 static void
  47 add_to_cbuf(char *s)
  48 {
  49         if(!cbuf) {
  50                 cbuf = g_string_new(s);
  51         } else {
  52                 cbuf = g_string_append(cbuf,s);
  53         }
  54 }
  55
  56 %}
  57
  58 %x COMMENT
  59 %x C_CODE
  60 %x C_CODE_STRING
  61 %x CLASS_CODE
  62 %x CLASS_CODE_I
  63
  64 %%
  65
  66 <*>\n                   { line_no++; REJECT; }
  67
  68 \/\/.*$                 { ; /*comment, ignore*/ }
  69 <C_CODE>\/\/.*$         { ; /*comment, ignore*/ }
  70 <CLASS_CODE>\/\/.*$     { ; /*comment, ignore*/ }
  71 <CLASS_CODE_I>\/\/.*$   { ; /*comment, ignore*/ }
  72 \/\*            {BEGIN(COMMENT); before_comment = INITIAL; }
  73 <C_CODE>\/\*    {BEGIN(COMMENT); before_comment = C_CODE; }
  74 <CLASS_CODE>\/\*        {BEGIN(COMMENT); before_comment = CLASS_CODE; }
  75 <CLASS_CODE_I>\/\*      {BEGIN(COMMENT); before_comment = CLASS_CODE_I; }
  76 <COMMENT>\*\/   {BEGIN(before_comment);}
  77 <COMMENT>.      { ; /* comment, ignore */ }
  78
  79 ^\%h\{          {
  80                         BEGIN(C_CODE);
  81                         parenth_depth = 1;
  82                         class_after_c = FALSE;
  83                         header_c = TRUE;
  84                         clear_cbuf();
  85                 }
  86 ^\%\{           {
  87                         BEGIN(C_CODE);
  88                         parenth_depth = 1;
  89                         class_after_c = FALSE;
  90                         header_c = FALSE;
  91                         clear_cbuf();
  92                 }
  93 <C_CODE>^\%\}   {
  94                         BEGIN(INITIAL);
  95                         yylval.cbuf = cbuf;
  96                         cbuf = NULL;
  97                         if(header_c)
  98                                 return HCODE;
  99                         else
 100                                 return CCODE;
 101                 }
 102
 103 <C_CODE>\'\{\'          { add_to_cbuf(yytext); }
 104 <C_CODE>\'\\\{\'        { add_to_cbuf(yytext); }
 105 <C_CODE>\'\}\'          { add_to_cbuf(yytext); }
 106 <C_CODE>\'\\\}\'        { add_to_cbuf(yytext); }
 107
 108 <C_CODE>\\.     { add_to_cbuf(yytext); }
 109 <C_CODE>\"      {
 110                         BEGIN(C_CODE_STRING);
 111                         add_to_cbuf(yytext);
 112                 }
 113 <C_CODE_STRING>\\.      {
 114                                 add_to_cbuf(yytext);
 115                         }
 116 <C_CODE_STRING>\"       {
 117                                 BEGIN(C_CODE);
 118                                 add_to_cbuf(yytext);
 119                         }
 120 <C_CODE_STRING>.        {
 121                                 add_to_cbuf(yytext);
 122                         }
 123
 124 <C_CODE>\{      {
 125                         parenth_depth++;
 126                         add_to_cbuf(yytext);
 127                 }
 128 <C_CODE>\}      {
 129                         parenth_depth--;
 130                         if(parenth_depth<0) {
 131                                 REJECT;
 132                         } else if(parenth_depth==0 && class_after_c) {
 133                                 BEGIN(CLASS_CODE_I);
 134                                 yylval.cbuf = cbuf;
 135                                 cbuf = NULL;
 136                                 return CCODE;
 137                         }
 138                         add_to_cbuf(yytext);
 139                 }
 140
 141 <C_CODE>.       { add_to_cbuf(yytext); }
 142 <C_CODE>\n      { add_to_cbuf(yytext); }
 143
 144 class           {
 145                         BEGIN(CLASS_CODE);
 146                         return CLASS;
 147                 }
 148
 149 <CLASS_CODE>from        {return FROM;}
 150
 151 <CLASS_CODE_I>void      {return VOID;}
 152 <CLASS_CODE_I>struct    {return STRUCT;}
 153 <CLASS_CODE_I>union     {return UNION;}
 154 <CLASS_CODE_I>enum      {return ENUM;}
 155 <CLASS_CODE_I>signed    {return SIGNED;}
 156 <CLASS_CODE_I>unsigned  {return UNSIGNED;}
 157 <CLASS_CODE_I>long      {return LONG;}
 158 <CLASS_CODE_I>short     {return SHORT;}
 159 <CLASS_CODE_I>int       {return INT;}
 160 <CLASS_CODE_I>float     {return FLOAT;}
 161 <CLASS_CODE_I>double    {return DOUBLE;}
 162 <CLASS_CODE_I>char      {return CHAR;}
 163
 164 <CLASS_CODE_I>public    {yylval.line = line_no; return PUBLIC;}
 165 <CLASS_CODE_I>private   {yylval.line = line_no; return PRIVATE;}
 166 <CLASS_CODE_I>argument  {yylval.line = line_no; return ARGUMENT;}
 167 <CLASS_CODE_I>virtual   {yylval.line = line_no; return VIRTUAL;}
 168 <CLASS_CODE_I>signal    {yylval.line = line_no; return SIGNAL;}
 169 <CLASS_CODE_I>last      {return LAST;}
 170 <CLASS_CODE_I>first     {return FIRST;}
 171 <CLASS_CODE_I>override  {yylval.line = line_no; return OVERRIDE;}
 172 <CLASS_CODE_I>check     {return CHECK;}
 173 <CLASS_CODE_I>null      {return CNULL;}
 174 <CLASS_CODE_I>type      {return TYPE;}
 175 <CLASS_CODE_I>onerror   {return ONERROR;}
 176 <CLASS_CODE_I>0|[1-9][0-9]*|0x[0-9a-fA-F]+|0[0-7]+|[0-9]*\.[0-9]+|\.[0-9][0-9]* {
 177                         yylval.id = g_strdup(yytext);
 178                         return NUMBER;
 179                 }
 180 <CLASS_CODE,CLASS_CODE_I>:?[A-Za-z_][A-Za-z0-9_]*(:[A-Za-z0-9_]*)+      {
 181                         yylval.id = g_strdup(yytext);
 182                         return TYPETOKEN;
 183                 }
 184 <CLASS_CODE,CLASS_CODE_I>[A-Za-z_][A-Za-z0-9_]* {
 185                         yylval.id = g_strdup(yytext);
 186                         return TOKEN;
 187                 }
 188
 189 <CLASS_CODE>\{  {
 190                         BEGIN(CLASS_CODE_I);
 191                         return '{';
 192                 }
 193 <CLASS_CODE_I>\{        {
 194                         BEGIN(C_CODE);
 195                         parenth_depth=1;
 196                         class_after_c = TRUE;
 197                         return '{';
 198                 }
 199 <CLASS_CODE_I>\}        {
 200                                 BEGIN(INITIAL);
 201                                 return '}';
 202                         }
 203
 204 <CLASS_CODE,CLASS_CODE_I,INITIAL>[\n\t ]        ;  /*ignore*/
 205
 206 <*>.            {
 207                         yylval.line = line_no;
 208                         return yytext[0];
 209                 }