mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-12-25 11:10:47 +00:00
442 lines
11 KiB
C++
442 lines
11 KiB
C++
/*
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* File Tokeniser/Parser/Whatever
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* by Jonathon Fowler
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* Remixed completely by Ken Silverman
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* See the included license file "BUILDLIC.TXT" for license info.
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*/
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#include "compat.h"
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#include "scriptfile.h"
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#include "baselayer.h"
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#include "compat.h"
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#include "cache1d.h"
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#include "vfs.h"
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#define ISWS(x) ((x == ' ') || (x == '\t') || (x == '\r') || (x == '\n'))
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static inline void skipoverws(scriptfile *sf) { if ((sf->textptr < sf->eof) && (!sf->textptr[0])) sf->textptr++; }
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static inline void skipovertoken(scriptfile *sf) { while ((sf->textptr < sf->eof) && (sf->textptr[0])) sf->textptr++; }
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char *scriptfile_gettoken(scriptfile *sf)
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{
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if (scriptfile_eof(sf)) return NULL;
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char *start = sf->ltextptr = sf->textptr;
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skipovertoken(sf);
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return start;
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}
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static int scriptfile_eof_error(scriptfile *sf)
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{
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if (scriptfile_eof(sf))
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{
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initprintf("Error on line %s:%d: unexpected eof\n", sf->filename, scriptfile_getlinum(sf, sf->textptr));
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return -1;
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}
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return 0;
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}
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int32_t scriptfile_getstring(scriptfile *sf, char **retst)
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{
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(*retst) = scriptfile_gettoken(sf);
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if (*retst == NULL)
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{
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initprintf("Error on line %s:%d: unexpected eof\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
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return -2;
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}
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return 0;
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}
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int32_t scriptfile_getnumber(scriptfile *sf, int32_t *num)
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{
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if (scriptfile_eof_error(sf)) return -1;
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while ((sf->textptr[0] == '0') && isdigit(sf->textptr[1]))
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sf->textptr++; //hack to treat octal numbers like decimal
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sf->ltextptr = sf->textptr;
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(*num) = strtol((const char *)sf->textptr,&sf->textptr,0);
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if (!ISWS(*sf->textptr) && *sf->textptr)
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{
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char *p = sf->textptr;
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skipovertoken(sf);
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initprintf("Error on line %s:%d: expecting int32_t, got \"%s\"\n",sf->filename,scriptfile_getlinum(sf,sf->ltextptr),p);
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return -2;
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}
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return 0;
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}
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static double parsedouble(char *ptr, char **end)
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{
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int32_t beforedecimal = 1, negative = 0, dig;
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int32_t exposgn = 0, expo = 0;
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double num = 0.0, decpl = 0.1;
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char *p;
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p = ptr;
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if (*p == '-') negative = 1, p++;
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else if (*p == '+') p++;
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for (;; p++)
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{
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if (isdigit(*p))
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{
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dig = *p - '0';
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if (beforedecimal) num = num * 10.0 + dig;
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else if (exposgn) expo = expo*10 + dig;
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else
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{
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num += (double)dig * decpl;
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decpl /= 10.0;
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}
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}
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else if (*p == '.')
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{
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if (beforedecimal) beforedecimal = 0;
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else break;
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}
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else if ((*p == 'E') || (*p == 'e'))
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{
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exposgn = 1;
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if (p[1] == '-') { exposgn = -1; p++; }
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else if (p[1] == '+') p++;
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}
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else break;
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}
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if (end) *end = p;
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if (exposgn) num *= pow(10.0,(double)(expo*exposgn));
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return negative ? -num : num;
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}
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int32_t scriptfile_getdouble(scriptfile *sf, double *num)
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{
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if (scriptfile_eof_error(sf))
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return -1;
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sf->ltextptr = sf->textptr;
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// On Linux, locale settings interfere with interpreting x.y format numbers
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//(*num) = strtod((const char *)sf->textptr,&sf->textptr);
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(*num) = parsedouble(sf->textptr, &sf->textptr);
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if (!ISWS(*sf->textptr) && *sf->textptr)
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{
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char *p = sf->textptr;
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skipovertoken(sf);
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initprintf("Error on line %s:%d: expecting float, got \"%s\"\n",sf->filename,scriptfile_getlinum(sf,sf->ltextptr),p);
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return -2;
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}
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return 0;
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}
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int scriptfile_getsymbol(scriptfile *sf, int32_t *num)
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{
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char *t = scriptfile_gettoken(sf);
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if (!t) return -1;
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char * e;
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int32_t v = Bstrtol(t, &e, 10);
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if (*e)
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{
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// looks like a string, so find it in the symbol table
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if (scriptfile_getsymbolvalue(t, num)) return 0;
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initprintf("Error on line %s:%d: expecting symbol, got \"%s\"\n", sf->filename, scriptfile_getlinum(sf, sf->ltextptr), t);
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return -2;
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}
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*num = v;
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return 0;
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}
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int32_t scriptfile_getbraces(scriptfile *sf, char **braceend)
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{
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if (scriptfile_eof_error(sf))
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return -1;
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if (sf->textptr[0] != '{')
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{
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initprintf("Error on line %s:%d: expecting '{'\n",sf->filename,scriptfile_getlinum(sf,sf->textptr));
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return -1;
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}
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char *bracestart = ++sf->textptr;
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int bracecnt = 1;
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do
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{
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if (sf->textptr >= sf->eof)
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return 0;
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else if (sf->textptr[0] == '{')
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bracecnt++;
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else if (sf->textptr[0] == '}')
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if (!(--bracecnt))
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break;
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sf->textptr++;
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} while (1);
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(*braceend) = sf->textptr;
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sf->textptr = bracestart;
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return 0;
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}
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int32_t scriptfile_getlinum(const scriptfile *sf, const char *ptr)
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{
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int32_t i, stp;
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intptr_t ind;
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//for(i=0;i<sf->linenum;i++) if (sf->lineoffs[i] >= ind) return i+1; //brute force algo
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ind = ((intptr_t)ptr) - ((intptr_t)sf->textbuf);
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for (stp=1; stp+stp<sf->linenum; stp+=stp) { } //stp = highest power of 2 less than sf->linenum
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for (i=0; stp; stp>>=1)
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if ((i+stp-1 < sf->linenum) && (sf->lineoffs[i+stp-1] < ind)) i += stp;
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return i+1; //i = index to highest lineoffs which is less than ind; convert to 1-based line numbers
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}
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void scriptfile_preparse(scriptfile *sf, char *tx, int32_t flen)
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{
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int32_t i, cr, numcr, nflen, ws, cs, inquote;
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//Count number of lines
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numcr = 1;
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for (i=0; i<flen; i++)
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{
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//detect all 4 types of carriage return (\r, \n, \r\n, \n\r :)
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cr = 0;
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if (tx[i] == '\r')
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{
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i += (tx[i + 1] == '\n');
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cr = 1;
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}
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else if (tx[i] == '\n')
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{
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i += (tx[i + 1] == '\r');
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cr = 1;
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}
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if (cr)
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{
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numcr++;
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continue;
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}
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}
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sf->linenum = numcr;
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sf->lineoffs = (int32_t *)Xmalloc(sf->linenum*sizeof(int32_t));
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//Preprocess file for comments (// and /*...*/, and convert all whitespace to single spaces)
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nflen = 0; ws = 0; cs = 0; numcr = 0; inquote = 0;
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for (i=0; i<flen; i++)
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{
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//detect all 4 types of carriage return (\r, \n, \r\n, \n\r :)
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cr = 0;
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if (tx[i] == '\r')
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{
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i += (tx[i + 1] == '\n');
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cr = 1;
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}
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else if (tx[i] == '\n')
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{
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i += (tx[i + 1] == '\r');
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cr = 1;
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}
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if (cr)
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{
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//Remember line numbers by storing the byte index at the start of each line
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//Line numbers can be retrieved by doing a binary search on the byte index :)
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sf->lineoffs[numcr++] = nflen;
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if (cs == 1) cs = 0;
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ws = 1; continue; //strip CR/LF
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}
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if ((!inquote) && ((tx[i] == ' ') || (tx[i] == '\t')))
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{
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ws = 1;
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continue;
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} // strip Space/Tab
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if ((tx[i] == '/') && (tx[i + 1] == '/') && (!cs))
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cs = 1;
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if ((tx[i] == '/') && (tx[i + 1] == '*') && (!cs))
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{
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ws = 1;
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cs = 2;
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}
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if ((tx[i] == '*') && (tx[i + 1] == '/') && (cs == 2))
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{
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cs = 0;
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i++;
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continue;
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}
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if (cs)
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continue;
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if (ws)
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tx[nflen++] = ws = 0;
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//quotes inside strings: \"
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if ((tx[i] == '\\') && (tx[i+1] == '\"')) { i++; tx[nflen++] = '\"'; continue; }
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if (tx[i] == '\"') { inquote ^= 1; continue; }
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tx[nflen++] = tx[i];
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}
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tx[nflen++] = 0; sf->lineoffs[numcr] = nflen;
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tx[nflen++] = 0;
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#if 0
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//for debugging only:
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printf("pre-parsed file:flen=%d,nflen=%d\n",flen,nflen);
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for (i=0; i<nflen; i++) { if (tx[i] < 32) printf("_"); else printf("%c",tx[i]); }
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printf("[eof]\nnumlines=%d\n",sf->linenum);
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for (i=0; i<sf->linenum; i++) printf("line %d = byte %d\n",i,sf->lineoffs[i]);
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#endif
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sf->textbuf = sf->textptr = tx;
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sf->textlength = nflen;
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sf->eof = &sf->textbuf[nflen-1];
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}
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scriptfile *scriptfile_fromfile(const char *fn)
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{
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auto fr = kopenFileReader(fn, 0);
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if (!fr.isOpen()) return nullptr;
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uint32_t flen = fr.GetLength();
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char * tx = (char *)Xmalloc(flen + 2);
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scriptfile *sf = (scriptfile *)Xmalloc(sizeof(scriptfile));
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fr.Read(tx, flen);
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tx[flen] = tx[flen+1] = 0;
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scriptfile_preparse(sf,tx,flen);
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sf->filename = Xstrdup(fn);
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return sf;
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}
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scriptfile *scriptfile_fromstring(const char *string)
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{
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if (!string) return nullptr;
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uint32_t flen = Bstrlen(string);
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char * tx = (char *)Xmalloc(flen + 2);
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scriptfile *sf = (scriptfile *)Xmalloc(sizeof(scriptfile));
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Bmemcpy(tx, string, flen);
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tx[flen] = tx[flen+1] = 0;
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scriptfile_preparse(sf,tx,flen);
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sf->filename = NULL;
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return sf;
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}
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void scriptfile_close(scriptfile *sf)
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{
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if (!sf) return;
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Xfree(sf->lineoffs);
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Xfree(sf->textbuf);
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Xfree(sf->filename);
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Xfree(sf);
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}
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int scriptfile_eof(scriptfile *sf)
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{
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skipoverws(sf);
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return !!(sf->textptr >= sf->eof);
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}
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#define SYMBTABSTARTSIZE 256
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static int32_t symbtablength=0, symbtaballoclength=0;
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static char *symbtab = NULL;
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static char *getsymbtabspace(int32_t reqd)
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{
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char *pos,*np;
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int32_t i;
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if (symbtablength + reqd > symbtaballoclength)
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{
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for (i=max(symbtaballoclength,SYMBTABSTARTSIZE); symbtablength+reqd>i; i<<=1) { }
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np = (char *)Xrealloc(symbtab, i);
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symbtab = np; symbtaballoclength = i;
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}
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pos = &symbtab[symbtablength];
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symbtablength += reqd;
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return pos;
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}
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int32_t scriptfile_getsymbolvalue(char const *name, int32_t *val)
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{
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if (Bstrlen(name) > 2)
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{
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if (name[0] == '0' && tolower(name[1]) == 'x') // hex constants
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{
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uint64_t x;
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sscanf(name + 2, "%" PRIx64 "", &x);
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if (EDUKE32_PREDICT_FALSE(x > UINT32_MAX))
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buildprint("warning: number 0x", hex(x), " truncated to 32 bits.\n");
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*val = x;
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return 1;
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}
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}
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char *scanner = symbtab;
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if (!symbtab) return 0;
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while (scanner - symbtab < symbtablength)
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{
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if (!Bstrcasecmp(name, scanner))
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{
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*val = B_UNBUF32(scanner + strlen(scanner) + 1);
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return 1;
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}
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scanner += strlen(scanner) + 1 + sizeof(int32_t);
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}
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return 0;
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}
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int32_t scriptfile_addsymbolvalue(char const *name, int32_t val)
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{
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char *sp;
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// if (scriptfile_getsymbolvalue(name, &x)) return -1; // already exists
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if (symbtab)
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{
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char *scanner = symbtab;
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while (scanner - symbtab < symbtablength)
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{
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if (!Bstrcasecmp(name, scanner))
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{
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B_BUF32(scanner + strlen(scanner) + 1, val);
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return 1;
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}
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scanner += strlen(scanner) + 1 + sizeof(int32_t);
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}
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}
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sp = getsymbtabspace(strlen(name) + 1 + sizeof(int32_t));
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if (!sp) return 0;
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strcpy(sp, name);
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sp += strlen(name)+1;
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B_BUF32(sp, val);
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return 1; // added
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}
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void scriptfile_clearsymbols(void)
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{
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DO_FREE_AND_NULL(symbtab);
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symbtablength = 0;
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symbtaballoclength = 0;
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}
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