raze/polymer/build/src/scriptfile.c

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/*
* File Tokeniser/Parser/Whatever
* by Jonathon Fowler
* Remixed completely by Ken Silverman
* See the included license file "BUILDLIC.TXT" for license info.
*/
#include "scriptfile.h"
#include "baselayer.h"
#include "compat.h"
#include "cache1d.h"
#include <math.h>
#define ISWS(x) ((x == ' ') || (x == '\t') || (x == '\r') || (x == '\n'))
static void skipoverws(scriptfile *sf) { if ((sf->textptr < sf->eof) && (!sf->textptr[0])) sf->textptr++; }
static void skipovertoken(scriptfile *sf) { while ((sf->textptr < sf->eof) && (sf->textptr[0])) sf->textptr++; }
char *scriptfile_gettoken(scriptfile *sf)
{
char *start;
skipoverws(sf);
if (sf->textptr >= sf->eof) return NULL;
start = sf->ltextptr = sf->textptr;
skipovertoken(sf);
return start;
}
int scriptfile_getstring(scriptfile *sf, char **retst)
{
(*retst) = scriptfile_gettoken(sf);
if (*retst == NULL)
{
initprintf("Error on line %s:%d: unexpected eof\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
return(-2);
}
return(0);
}
int scriptfile_getnumber(scriptfile *sf, int *num)
{
skipoverws(sf);
if (sf->textptr >= sf->eof)
{
initprintf("Error on line %s:%d: unexpected eof\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
return -1;
}
while ((sf->textptr[0] == '0') && (sf->textptr[1] >= '0') && (sf->textptr[1] <= '9'))
sf->textptr++; //hack to treat octal numbers like decimal
sf->ltextptr = sf->textptr;
(*num) = strtol((const char *)sf->textptr,&sf->textptr,0);
if (!ISWS(*sf->textptr) && *sf->textptr) {
char *p = sf->textptr;
skipovertoken(sf);
initprintf("Error on line %s:%d: expecting int, got \"%s\"\n",sf->filename,scriptfile_getlinum(sf,sf->ltextptr),p);
return -2;
}
return 0;
}
static double parsedouble(char *ptr, char **end)
{
int beforedecimal = 1, negative = 0, dig;
int exposgn = 0, expo = 0;
double num = 0.0, decpl = 0.1;
char *p;
p = ptr;
if (*p == '-') negative = 1, p++;
else if (*p == '+') p++;
for (;; p++) {
if (*p >= '0' && *p <= '9') {
dig = *p - '0';
if (beforedecimal) num = num * 10.0 + dig;
else if (exposgn) expo = expo*10 + dig;
else {
num += (double)dig * decpl;
decpl /= 10.0;
}
} else if (*p == '.') {
if (beforedecimal) beforedecimal = 0;
else break;
} else if ((*p == 'E') || (*p == 'e')) {
exposgn = 1;
if (p[1] == '-') { exposgn = -1; p++; }
else if (p[1] == '+') p++;
} else break;
}
if (end) *end = p;
if (exposgn) num *= pow(10.0,(double)(expo*exposgn));
return negative ? -num : num;
}
int scriptfile_getdouble(scriptfile *sf, double *num)
{
skipoverws(sf);
if (sf->textptr >= sf->eof)
{
initprintf("Error on line %s:%d: unexpected eof\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
return -1;
}
sf->ltextptr = sf->textptr;
// On Linux, locale settings interfere with interpreting x.y format numbers
//(*num) = strtod((const char *)sf->textptr,&sf->textptr);
(*num) = parsedouble(sf->textptr, &sf->textptr);
if (!ISWS(*sf->textptr) && *sf->textptr) {
char *p = sf->textptr;
skipovertoken(sf);
initprintf("Error on line %s:%d: expecting float, got \"%s\"\n",sf->filename,scriptfile_getlinum(sf,sf->ltextptr),p);
return -2;
}
return 0;
}
int scriptfile_getsymbol(scriptfile *sf, int *num)
{
char *t, *e;
int v;
t = scriptfile_gettoken(sf);
if (!t) return -1;
v = Bstrtol(t, &e, 10);
if (*e) {
// looks like a string, so find it in the symbol table
if (scriptfile_getsymbolvalue(t, num)) return 0;
initprintf("Error on line %s:%d: expecting symbol, got \"%s\"\n",sf->filename,scriptfile_getlinum(sf,sf->ltextptr),t);
return -2; // not found
}
*num = v;
return 0;
}
int scriptfile_getbraces(scriptfile *sf, char **braceend)
{
int bracecnt;
char *bracestart;
skipoverws(sf);
if (sf->textptr >= sf->eof)
{
initprintf("Error on line %s:%d: unexpected eof\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
return -1;
}
if (sf->textptr[0] != '{') {
initprintf("Error on line %s:%d: expecting '{'\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
return -1;
}
bracestart = ++sf->textptr; bracecnt = 1;
while (1)
{
if (sf->textptr >= sf->eof) return(0);
if (sf->textptr[0] == '{') bracecnt++;
if (sf->textptr[0] == '}') { bracecnt--; if (!bracecnt) break; }
sf->textptr++;
}
(*braceend) = sf->textptr;
sf->textptr = bracestart;
return 0;
}
int scriptfile_getlinum (scriptfile *sf, char *ptr)
{
int i, stp, ind;
//for(i=0;i<sf->linenum;i++) if (sf->lineoffs[i] >= ind) return(i+1); //brute force algo
ind = ((long)ptr) - ((long)sf->textbuf);
for(stp=1;stp+stp<sf->linenum;stp+=stp); //stp = highest power of 2 less than sf->linenum
for(i=0;stp;stp>>=1)
if ((i+stp < sf->linenum) && (sf->lineoffs[i+stp] < ind)) i += stp;
return(i+1); //i = index to highest lineoffs which is less than ind; convert to 1-based line numbers
}
void scriptfile_preparse (scriptfile *sf, char *tx, long flen)
{
long i, cr, numcr, nflen, ws, cs, inquote;
//Count number of lines
numcr = 1;
for(i=0;i<flen;i++)
{
//detect all 4 types of carriage return (\r, \n, \r\n, \n\r :)
cr=0;if (tx[i] == '\r') { i += (tx[i+1] == '\n'); cr = 1; }
else if (tx[i] == '\n') { i += (tx[i+1] == '\r'); cr = 1; }
if (cr) { numcr++; continue; }
}
sf->linenum = numcr;
sf->lineoffs = (long *)malloc(sf->linenum*sizeof(long));
//Preprocess file for comments (// and /*...*/, and convert all whitespace to single spaces)
nflen = 0; ws = 0; cs = 0; numcr = 0; inquote = 0;
for(i=0;i<flen;i++)
{
//detect all 4 types of carriage return (\r, \n, \r\n, \n\r :)
cr=0;if (tx[i] == '\r') { i += (tx[i+1] == '\n'); cr = 1; }
else if (tx[i] == '\n') { i += (tx[i+1] == '\r'); cr = 1; }
if (cr)
{
//Remember line numbers by storing the byte index at the start of each line
//Line numbers can be retrieved by doing a binary search on the byte index :)
sf->lineoffs[numcr++] = nflen;
if (cs == 1) cs = 0;
ws = 1; continue; //strip CR/LF
}
if ((!inquote) && ((tx[i] == ' ') || (tx[i] == '\t'))) { ws = 1; continue; } //strip Space/Tab
if ((tx[i] == '/') && (tx[i+1] == '/') && (!cs)) cs = 1;
if ((tx[i] == '/') && (tx[i+1] == '*') && (!cs)) { ws = 1; cs = 2; }
if ((tx[i] == '*') && (tx[i+1] == '/') && (cs == 2)) { cs = 0; i++; continue; }
if (cs) continue;
if (ws) { tx[nflen++] = 0; ws = 0; }
//quotes inside strings: \"
if ((tx[i] == '\\') && (tx[i+1] == '\"')) { i++; tx[nflen++] = '\"'; continue; }
if (tx[i] == '\"') { inquote ^= 1; continue; }
tx[nflen++] = tx[i];
}
tx[nflen++] = 0; sf->lineoffs[numcr] = nflen;
tx[nflen++] = 0;
#if 0
//for debugging only:
printf("pre-parsed file:flen=%d,nflen=%d\n",flen,nflen);
for(i=0;i<nflen;i++) { if (tx[i] < 32) printf("_"); else printf("%c",tx[i]); }
printf("[eof]\nnumlines=%d\n",sf->linenum);
for(i=0;i<sf->linenum;i++) printf("line %d = byte %d\n",i,sf->lineoffs[i]);
#endif
flen = nflen;
sf->textbuf = sf->textptr = tx;
sf->textlength = nflen;
sf->eof = &sf->textbuf[nflen-1];
}
scriptfile *scriptfile_fromfile(char *fn)
{
int fp;
scriptfile *sf;
char *tx;
unsigned int flen;
fp = kopen4load(fn,0);
if (fp<0) return NULL;
flen = kfilelength(fp);
tx = (char *) malloc(flen + 2);
if (!tx) {
kclose(fp);
return NULL;
}
sf = (scriptfile*) malloc(sizeof(scriptfile));
if (!sf) {
kclose(fp);
free(tx);
return NULL;
}
kread(fp, tx, flen);
tx[flen] = tx[flen+1] = 0;
kclose(fp);
scriptfile_preparse(sf,tx,flen);
sf->filename = strdup(fn);
return sf;
}
scriptfile *scriptfile_fromstring(char *string)
{
scriptfile *sf;
char *tx;
unsigned int flen;
if (!string) return NULL;
flen = strlen(string);
tx = (char *) malloc(flen + 2);
if (!tx) return NULL;
sf = (scriptfile*) malloc(sizeof(scriptfile));
if (!sf) {
free(tx);
return NULL;
}
memcpy(tx, string, flen);
tx[flen] = tx[flen+1] = 0;
scriptfile_preparse(sf,tx,flen);
sf->filename = NULL;
return sf;
}
void scriptfile_close(scriptfile *sf)
{
if (!sf) return;
if (sf->lineoffs) free(sf->lineoffs);
if (sf->textbuf) free(sf->textbuf);
if (sf->filename) free(sf->filename);
sf->textbuf = NULL;
sf->filename = NULL;
free(sf);
}
int scriptfile_eof(scriptfile *sf)
{
skipoverws(sf);
if (sf->textptr >= sf->eof) return 1;
return 0;
}
#define SYMBTABSTARTSIZE 256
static int symbtablength=0, symbtaballoclength=0;
static char *symbtab = NULL;
static char * getsymbtabspace(int reqd)
{
char *pos,*np;
int i;
if (symbtablength + reqd > symbtaballoclength)
{
for(i=max(symbtaballoclength,SYMBTABSTARTSIZE);symbtablength+reqd>i;i<<=1);
np = (char *)realloc(symbtab, i); if (!np) return NULL;
symbtab = np; symbtaballoclength = i;
}
pos = &symbtab[symbtablength];
symbtablength += reqd;
return pos;
}
int scriptfile_getsymbolvalue(char *name, int *val)
{
char *scanner = symbtab;
if (!symbtab) return 0;
while (scanner - symbtab < symbtablength) {
if (!Bstrcasecmp(name, scanner)) {
*val = *(int*)(scanner + strlen(scanner) + 1);
return 1;
}
scanner += strlen(scanner) + 1 + sizeof(int);
}
return 0;
}
int scriptfile_addsymbolvalue(char *name, int val)
{
int x;
char *sp;
// if (scriptfile_getsymbolvalue(name, &x)) return -1; // already exists
if (symbtab) {
char *scanner = symbtab;
while (scanner - symbtab < symbtablength) {
if (!Bstrcasecmp(name, scanner)) {
*(int*)(scanner + strlen(scanner) + 1) = val;
return 1;
}
scanner += strlen(scanner) + 1 + sizeof(int);
}
}
sp = getsymbtabspace(strlen(name) + 1 + sizeof(int));
if (!sp) return 0;
strcpy(sp, name);
sp += strlen(name)+1;
*(int*)sp = val;
return 1; // added
}
void scriptfile_clearsymbols(void)
{
if (symbtab) free(symbtab);
symbtab = NULL;
symbtablength = 0;
symbtaballoclength = 0;
}