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|
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/* define some search patterns */ |
| 3 |
|
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digit [0-9] |
| 5 |
letter [A-Za-z] |
| 6 |
natural {digit}+ |
| 7 |
signedNat ("+"|"-")?{natural} |
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number {signedNat}("."{natural})?([Ee]{signedNat})? |
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identifier ("_"|{letter})({letter}|{digit}|"-"|"_")* |
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|
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/* define start states */ |
| 12 |
|
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%x PRE_P |
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%x INCL |
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%x DEF |
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%x IFDEF |
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%x IFNDEF |
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%x ESCAPE |
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%x CHECK_ESCAPE |
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|
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/* what to put at the top of the lex code */ |
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|
| 23 |
%{ |
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#include <stdio.h> |
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#include <string.h> |
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#include "BASS_parse.h" |
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|
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typedef unsigned short int r_short; |
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|
| 30 |
extern void change_in_file( FILE* in_file ); |
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|
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// the following is used by the include start state |
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|
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#define MAX_BUFFER_DEPTH 10 |
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YY_BUFFER_STATE buffer_stack[MAX_BUFFER_DEPTH]; // a stack of the include buffers |
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int buffer_stack_ptr = 0; |
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struct filename_list{ |
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char my_name[300]; |
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struct filename_list* next; |
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}; |
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struct filename_list* yyfile_name; |
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struct filename_list* temp_yyfile_name; |
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int yylineno_stack[MAX_BUFFER_DEPTH]; |
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|
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|
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// the following is a check against the define buffer length |
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|
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void check_def_buff( char* defined, int index ); |
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|
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//these are used by the ifdef and ifndef statements |
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|
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int escape_stack_ptr = 0; //keeps track of the escape stack |
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|
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|
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%} |
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|
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%option yylineno |
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|
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%% |
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|
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{signedNat} { |
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yylval.i_val = atoi( yytext ); |
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return INTEGER; |
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} |
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|
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{number} { |
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yylval.d_val = atof( yytext ); |
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return DOUBLE; |
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} |
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|
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{identifier} { |
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int token; |
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token = res_word( yytext ); |
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|
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if( token == DEFINED ){ |
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|
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if( buffer_stack_ptr >= MAX_BUFFER_DEPTH ){ |
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fprintf( stderr, |
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"Maximum buffer depth exceeded for %s.\n", |
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yytext ); |
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exit(1); |
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} |
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|
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buffer_stack[buffer_stack_ptr] = YY_CURRENT_BUFFER; |
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buffer_stack_ptr++; |
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|
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yy_scan_string( get_definition( yytext ) ); |
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} |
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else if( token ){ |
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return token; |
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} |
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else{ |
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yylval.s_ptr = strdup( yytext ); |
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return IDENTIFIER; |
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} |
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} |
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|
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\".*\" { |
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/* little routine to strip off the quotes */ |
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|
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u_short i; |
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i = 0; // index |
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while( yytext[i+1] != '\"' ){ |
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|
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yytext[i] = yytext[i+1]; |
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i++; |
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} |
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yytext[i] = '\0'; |
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yylval.s_ptr = strdup( yytext ); |
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return QUOTED_STRING; |
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} |
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|
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\[{natural}\] { |
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int index; |
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sscanf(yytext, "[%d]", &index); |
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yylval.i_val = index; |
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return ARRAY_INDEX; |
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} |
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|
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[ \t\n]+ /* ignore whitespace */; |
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|
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"/*" { |
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/* ignore comments */ |
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u_short done; |
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char c; |
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|
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done = 0; |
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while( !done ){ |
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|
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c = input(); |
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while( c != '*' ){ |
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|
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c = input(); |
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} |
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while( c == '*' ){ |
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|
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c = input(); |
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} |
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if( c == '/' ) done = 1; |
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} |
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} |
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|
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"//".*\n /* ignore comments */; |
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|
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"#" BEGIN(PRE_P); |
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|
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. { |
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// pass everything else to yacc |
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return yytext[0]; |
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} |
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|
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<PRE_P>"include" BEGIN(INCL); |
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<PRE_P>"define" BEGIN(DEF); |
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<PRE_P>"ifdef" BEGIN(IFDEF); |
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<PRE_P>"ifndef" BEGIN(IFNDEF); |
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<PRE_P>"endif" /* do nothing */; |
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<PRE_P>\n BEGIN(INITIAL); |
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|
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<INCL>[ \t]* /* eat white space */ |
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<INCL>\".*\" { |
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char foo_name[300]; |
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|
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// little routine to strip off the quotes |
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|
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u_short i; |
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i = 0; // index |
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while( yytext[i+1] != '\"' ){ |
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|
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yytext[i] = yytext[i+1]; |
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i++; |
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} |
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|
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yytext[i] = '\0'; |
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strcpy( foo_name, yytext ); |
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|
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// now we have the include file name |
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|
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if( buffer_stack_ptr >= MAX_BUFFER_DEPTH ){ |
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|
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fprintf( stderr, "Includes nested too deeply\n" ); |
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exit(1); |
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} |
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|
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buffer_stack[buffer_stack_ptr] = YY_CURRENT_BUFFER; |
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yylineno_stack[buffer_stack_ptr] = yylineno; |
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buffer_stack_ptr++; |
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|
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yyin = fopen( yytext, "r" ); |
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if( yyin == NULL ){ |
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fprintf( stderr, "Unable to include file %s\n", yytext ); |
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exit(1); |
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} |
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|
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yy_switch_to_buffer( yy_create_buffer( yyin, YY_BUF_SIZE ) ); |
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yylineno = 0; |
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|
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temp_yyfile_name = (struct filename_list* )malloc( sizeof( struct filename_list ) ); |
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temp_yyfile_name->next = yyfile_name; |
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yyfile_name = temp_yyfile_name; |
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strcpy( yyfile_name->my_name, foo_name ); |
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|
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|
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BEGIN(INITIAL); |
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} |
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<INCL>\n BEGIN(INITIAL); |
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<INCL>. /* ignore everything else */ |
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|
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<DEF>[ \t]* /* eat white space */; |
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<DEF>{identifier} { |
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char c; |
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char definition[ DEFINED_BUFFER_SIZE ]; |
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short int done; |
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short int c_done; // a done marker for the comments |
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int def_ptr; |
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|
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// initialize the definition buffer |
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|
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for( def_ptr = 0; def_ptr < DEFINED_BUFFER_SIZE; def_ptr++ ){ |
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definition[def_ptr] = '\0'; |
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} |
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|
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def_ptr =0; |
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done = 0; |
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c_done = 0; |
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|
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while( !done ){ |
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|
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c = input(); |
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if( c == '\"' ){ |
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|
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// shove the whole quoted string into the macro |
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|
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definition[def_ptr] = c; |
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fprintf( stderr, "%c", c ); |
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def_ptr++; |
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check_def_buff( yytext, def_ptr ); |
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|
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c = input(); |
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while( c != '\"' ){ |
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|
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definition[def_ptr] = c; |
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fprintf( stderr, "%c", c ); |
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def_ptr++; |
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check_def_buff( yytext, def_ptr ); |
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|
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c = input(); |
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} |
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definition[def_ptr] = c; |
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fprintf( stderr, "%c", c ); |
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def_ptr++; |
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check_def_buff( yytext, def_ptr ); |
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c = input(); |
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} |
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|
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// handle comments |
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|
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if( c == '/' ){ |
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c = input(); |
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switch( c ){ |
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|
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case '/': |
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while( c != '\n' && c != '\\' ){ |
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c = input(); |
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} |
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break; |
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|
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case '*': |
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c_done = 0; |
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while( !c_done ){ |
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c = input(); |
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while( c != '*' ){ |
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c = input(); |
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} |
| 274 |
while( c == '*' ){ |
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c = input(); |
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} |
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if( c == '/' ) c_done = 1; |
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} |
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c = input(); |
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break; |
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|
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default: |
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// the '/' char was a normal symbol |
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definition[def_ptr] = '/'; |
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fprintf( stderr, "%c", c ); |
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def_ptr++; |
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check_def_buff( yytext, def_ptr ); |
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break; |
| 289 |
} |
| 290 |
} |
| 291 |
|
| 292 |
|
| 293 |
if( c == '\n' ){ |
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done = 1; |
| 295 |
} |
| 296 |
|
| 297 |
else{ |
| 298 |
|
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// check for the line wrap character '\' |
| 300 |
|
| 301 |
if( c == '\\' ){ |
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|
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// skip the rest of the line until the line return |
| 304 |
|
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c = input(); |
| 306 |
while( c != '\n' ){ |
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c = input(); |
| 308 |
} |
| 309 |
} |
| 310 |
|
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else{ |
| 312 |
|
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// we now know the character is a good one |
| 314 |
|
| 315 |
definition[def_ptr] = c; |
| 316 |
fprintf( stderr, "%c", c ); |
| 317 |
def_ptr++; |
| 318 |
check_def_buff( yytext, def_ptr ); |
| 319 |
} |
| 320 |
} |
| 321 |
} |
| 322 |
|
| 323 |
insert_define( yytext, definition ); |
| 324 |
BEGIN(INITIAL); |
| 325 |
} |
| 326 |
<DEF>\n BEGIN(INITIAL); |
| 327 |
<DEF>. /* ignore everything else */; |
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|
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<IFDEF>[ \t]* /* eat white space */; |
| 330 |
<IFDEF>{identifier} { |
| 331 |
if( !is_defined( yytext ) ){ |
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escape_stack_ptr++; |
| 333 |
BEGIN(ESCAPE); |
| 334 |
} |
| 335 |
} |
| 336 |
<IFDEF>\n BEGIN(INITIAL); |
| 337 |
<IFDEF>. /* ignore everything else */; |
| 338 |
|
| 339 |
<IFNDEF>[ \t]* /* eat the white space */; |
| 340 |
<IFNDEF>{identifier} { |
| 341 |
if( is_defined( yytext ) ){ |
| 342 |
escape_stack_ptr++; |
| 343 |
BEGIN(ESCAPE); |
| 344 |
} |
| 345 |
} |
| 346 |
<IFNDEF>\n BEGIN(INITIAL); |
| 347 |
<IFNDEF>. /* ignore everything else */; |
| 348 |
|
| 349 |
<ESCAPE>\".*\" /* do nothing */; |
| 350 |
<ESCAPE>"//".*\n /* ignore comments */; |
| 351 |
<ESCAPE>"/*" { |
| 352 |
/* ignore comments */ |
| 353 |
u_short done; |
| 354 |
char c; |
| 355 |
|
| 356 |
done = 0; |
| 357 |
while( !done ){ |
| 358 |
|
| 359 |
c = input(); |
| 360 |
while( c != '*' ){ |
| 361 |
|
| 362 |
c = input(); |
| 363 |
} |
| 364 |
|
| 365 |
while( c == '*' ){ |
| 366 |
|
| 367 |
c = input(); |
| 368 |
} |
| 369 |
|
| 370 |
if( c == '/' ) done = 1; |
| 371 |
} |
| 372 |
} |
| 373 |
<ESCAPE>"#" BEGIN(CHECK_ESCAPE); |
| 374 |
<ESCAPE>. /* ignore everything else */; |
| 375 |
|
| 376 |
<CHECK_ESCAPE>[ \t] /* ignore whitespace */; |
| 377 |
<CHECK_ESCAPE>"ifdef" { escape_stack_ptr++; BEGIN(ESCAPE); } |
| 378 |
<CHECK_ESCAPE>"ifndef" { escape_stack_ptr++; BEGIN(ESCAPE); } |
| 379 |
<CHECK_ESCAPE>"endif" { |
| 380 |
escape_stack_ptr--; |
| 381 |
if( escape_stack_ptr <= 0){ |
| 382 |
escape_stack_ptr = 0; // just in case something flubbed |
| 383 |
BEGIN(INITIAL); |
| 384 |
} |
| 385 |
} |
| 386 |
<CHECK_ESCAPE>\n BEGIN(ESCAPE); |
| 387 |
<CHECK_ESCAPE>. /* ignore everything else */; |
| 388 |
|
| 389 |
<<EOF>> { |
| 390 |
buffer_stack_ptr--; |
| 391 |
if( buffer_stack_ptr < 0 ){ |
| 392 |
|
| 393 |
yyterminate(); |
| 394 |
} |
| 395 |
|
| 396 |
else{ |
| 397 |
|
| 398 |
yy_delete_buffer( YY_CURRENT_BUFFER ); |
| 399 |
yy_switch_to_buffer( buffer_stack[buffer_stack_ptr] ); |
| 400 |
yylineno = yylineno_stack[buffer_stack_ptr]; |
| 401 |
|
| 402 |
temp_yyfile_name = yyfile_name; |
| 403 |
yyfile_name = temp_yyfile_name->next; |
| 404 |
free( temp_yyfile_name ); |
| 405 |
} |
| 406 |
} |
| 407 |
|
| 408 |
%% |
| 409 |
|
| 410 |
void check_def_buff( char* defined, int index ){ |
| 411 |
|
| 412 |
if( index >= DEFINED_BUFFER_SIZE ){ |
| 413 |
|
| 414 |
fprintf( stderr, "Define buffer size exceeded for %s\n", defined ); |
| 415 |
exit(1); |
| 416 |
} |
| 417 |
} |
| 418 |
|
| 419 |
int yywrap(void){ |
| 420 |
return 1; |
| 421 |
} |
| 422 |
|
| 423 |
void change_in_file( FILE* in_file ){ |
| 424 |
|
| 425 |
yyin = in_file; |
| 426 |
} |
