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Add the '%ifdef' capability to lemon. Other minor changes. (CVS 1836)

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FossilOrigin-Name: 522ff721ccc33c4b89072fed4e451f0df82e8140
This commit is contained in:
drh
2004-07-20 12:45:22 +00:00
parent cf55b7aef7
commit 6d08b4d647
8 changed files with 115 additions and 35 deletions
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87
tool/lemon.c
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@ -1311,6 +1311,31 @@ void memory_error(){
exit(1);
}
static int nDefine = 0; /* Number of -D options on the command line */
static char **azDefine = 0; /* Name of the -D macros */
/* This routine is called with the argument to each -D command-line option.
** Add the macro defined to the azDefine array.
*/
static void handle_D_option(char *z){
char **paz;
nDefine++;
azDefine = realloc(azDefine, sizeof(azDefine[0])*nDefine);
if( azDefine==0 ){
fprintf(stderr,"out of memory\n");
exit(1);
}
paz = &azDefine[nDefine-1];
*paz = malloc( strlen(z)+1 );
if( *paz==0 ){
fprintf(stderr,"out of memory\n");
exit(1);
}
strcpy(*paz, z);
for(z=*paz; *z && *z!='='; z++){}
*z = 0;
}
/* The main program. Parse the command line and do it... */
int main(argc,argv)
@ -1327,10 +1352,12 @@ char **argv;
static struct s_options options[] = {
{OPT_FLAG, "b", (char*)&basisflag, "Print only the basis in report."},
{OPT_FLAG, "c", (char*)&compress, "Don't compress the action table."},
{OPT_FSTR, "D", (char*)handle_D_option, "Define an %ifdef macro."},
{OPT_FLAG, "g", (char*)&rpflag, "Print grammar without actions."},
{OPT_FLAG, "m", (char*)&mhflag, "Output a makeheaders compatible file"},
{OPT_FLAG, "q", (char*)&quiet, "(Quiet) Don't print the report file."},
{OPT_FLAG, "s", (char*)&statistics, "Print parser stats to standard output."},
{OPT_FLAG, "s", (char*)&statistics,
"Print parser stats to standard output."},
{OPT_FLAG, "x", (char*)&version, "Print the version number."},
{OPT_FLAG,0,0,0}
};
@ -1629,7 +1656,7 @@ FILE *err;
int errcnt = 0;
int j;
for(j=0; op[j].label; j++){
if( strcmp(&argv[i][1],op[j].label)==0 ) break;
if( strncmp(&argv[i][1],op[j].label,strlen(op[j].label))==0 ) break;
}
v = argv[i][0]=='-' ? 1 : 0;
if( op[j].label==0 ){
@ -1642,6 +1669,8 @@ FILE *err;
*((int*)op[j].arg) = v;
}else if( op[j].type==OPT_FFLAG ){
(*(void(*)())(op[j].arg))(v);
}else if( op[j].type==OPT_FSTR ){
(*(void(*)())(op[j].arg))(&argv[i][2]);
}else{
if( err ){
fprintf(err,"%smissing argument on switch.\n",emsg);
@ -2271,6 +2300,57 @@ to follow the previous rule.");
}
}
/* Run the proprocessor over the input file text. The global variables
** azDefine[0] through azDefine[nDefine-1] contains the names of all defined
** macros. This routine looks for "%ifdef" and "%ifndef" and "%endif" and
** comments them out. Text in between is also commented out as appropriate.
*/
static preprocess_input(char *z){
int i, j, k, n;
int exclude = 0;
int start;
int lineno = 1;
int start_lineno;
for(i=0; z[i]; i++){
if( z[i]=='\n' ) lineno++;
if( z[i]!='%' || (i>0 && z[i-1]!='\n') ) continue;
if( strncmp(&z[i],"%endif",6)==0 && isspace(z[i+6]) ){
if( exclude ){
exclude--;
if( exclude==0 ){
for(j=start; j<i; j++) if( z[j]!='\n' ) z[j] = ' ';
}
}
for(j=i; z[j] && z[j]!='\n'; j++) z[j] = ' ';
}else if( (strncmp(&z[i],"%ifdef",6)==0 && isspace(z[i+6]))
|| (strncmp(&z[i],"%ifndef",7)==0 && isspace(z[i+7])) ){
if( exclude ){
exclude++;
}else{
for(j=i+7; isspace(z[j]); j++){}
for(n=0; z[j+n] && !isspace(z[j+n]); n++){}
exclude = 1;
for(k=0; k<nDefine; k++){
if( strncmp(azDefine[k],&z[j],n)==0 && strlen(azDefine[k])==n ){
exclude = 0;
break;
}
}
if( z[i+3]=='n' ) exclude = !exclude;
if( exclude ){
start = i;
start_lineno = lineno;
}
}
for(j=i; z[j] && z[j]!='\n'; j++) z[j] = ' ';
}
}
if( exclude ){
fprintf(stderr,"unterminated %%ifdef starting on line %d\n", start_lineno);
exit(1);
}
}
/* In spite of its name, this function is really a scanner. It read
** in the entire input file (all at once) then tokenizes it. Each
** token is passed to the function "parseonetoken" which builds all
@ -2320,6 +2400,9 @@ struct lemon *gp;
fclose(fp);
filebuf[filesize] = 0;
/* Make an initial pass through the file to handle %ifdef and %ifndef */
preprocess_input(filebuf);
/* Now scan the text of the input file */
lineno = 1;
for(cp=filebuf; (c= *cp)!=0; ){