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-rw-r--r--object/parse.c400
1 files changed, 400 insertions, 0 deletions
diff --git a/object/parse.c b/object/parse.c
new file mode 100644
index 00000000..c065a132
--- /dev/null
+++ b/object/parse.c
@@ -0,0 +1,400 @@
+#include <fitz.h>
+
+struct vap { va_list ap; };
+
+static inline int iswhite(int ch)
+{
+ return
+ ch == '\000' ||
+ ch == '\011' ||
+ ch == '\012' ||
+ ch == '\014' ||
+ ch == '\015' ||
+ ch == '\040';
+}
+
+static inline int isdelim(int ch)
+{
+ return
+ ch == '(' || ch == ')' ||
+ ch == '<' || ch == '>' ||
+ ch == '[' || ch == ']' ||
+ ch == '{' || ch == '}' ||
+ ch == '/' ||
+ ch == '%';
+}
+
+static inline int isregular(int ch)
+{
+ return !isdelim(ch) && !iswhite(ch) && ch != EOF;
+}
+
+static fz_error *parseobj(fz_obj **obj, char **sp, struct vap *v);
+
+static inline int fromhex(char ch)
+{
+ if (ch >= '0' && ch <= '9')
+ return ch - '0';
+ else if (ch >= 'A' && ch <= 'F')
+ return ch - 'A' + 0xA;
+ else if (ch >= 'a' && ch <= 'f')
+ return ch - 'a' + 0xA;
+ return 0;
+}
+
+static inline void skipwhite(char **sp)
+{
+ char *s = *sp;
+ while (iswhite(*s))
+ s ++;
+ *sp = s;
+}
+
+static void parsekeyword(char **sp, char *b, char *eb)
+{
+ char *s = *sp;
+ while (b < eb && isregular(*s))
+ *b++ = *s++;
+ *b++ = 0;
+ *sp = s;
+}
+
+static fz_error *parsename(fz_obj **obj, char **sp)
+{
+ char buf[64];
+ char *s = *sp;
+ char *p = buf;
+
+ s ++; /* skip '/' */
+ while (p < buf + sizeof buf - 1 && isregular(*s))
+ *p++ = *s++;
+ *p++ = 0;
+ *sp = s;
+
+ return fz_newname(obj, buf);
+}
+
+static fz_error *parsenumber(fz_obj **obj, char **sp)
+{
+ char buf[32];
+ char *s = *sp;
+ char *p = buf;
+
+ while (p < buf + sizeof buf - 1)
+ {
+ if (s[0] == '-' || s[0] == '.' || (s[0] >= '0' && s[0] <= '9'))
+ *p++ = *s++;
+ else
+ break;
+ }
+ *p++ = 0;
+ *sp = s;
+
+ if (strchr(buf, '.'))
+ return fz_newreal(obj, atof(buf));
+ return fz_newint(obj, atoi(buf));
+}
+
+static fz_error *parsedict(fz_obj **obj, char **sp, struct vap *v)
+{
+ fz_error *err = nil;
+ fz_obj *dict = nil;
+ fz_obj *key = nil;
+ fz_obj *val = nil;
+ char *s = *sp;
+
+ err = fz_newdict(&dict, 8);
+ if (err) return err;
+ *obj = dict;
+
+ s += 2; /* skip "<<" */
+
+ while (*s)
+ {
+ skipwhite(&s);
+
+ /* end-of-dict marker >> */
+ if (*s == '>') {
+ s ++;
+ if (*s == '>') {
+ s ++;
+ break;
+ }
+ err = fz_throw("syntaxerror in parsedict");
+ goto error;
+ }
+
+ /* non-name as key, bail */
+ if (*s != '/') {
+ err = fz_throw("syntaxerror in parsedict");
+ goto error;
+ }
+
+ err = parsename(&key, &s);
+ if (err) goto error;
+
+ skipwhite(&s);
+
+ err = parseobj(&val, &s, v);
+ if (err) goto error;
+
+ err = fz_dictput(dict, key, val);
+ if (err) goto error;
+
+ fz_dropobj(val); val = nil;
+ fz_dropobj(key); key = nil;
+ }
+
+ *sp = s;
+ return nil;
+
+error:
+ if (val) fz_dropobj(val);
+ if (key) fz_dropobj(key);
+ if (dict) fz_freedict(dict);
+ *obj = nil;
+ *sp = s;
+ return err;
+}
+
+static fz_error *parsearray(fz_obj **obj, char **sp, struct vap *v)
+{
+ fz_error *err;
+ fz_obj *a;
+ fz_obj *o;
+ char *s = *sp;
+
+ err = fz_newarray(&a, 8);
+ if (err) return err;
+ *obj = a;
+
+ s ++; /* skip '[' */
+
+ while (*s)
+ {
+ skipwhite(&s);
+
+ if (*s == ']') {
+ s ++;
+ break;
+ }
+
+ err = parseobj(&o, &s, v);
+ if (err) { *obj = nil; fz_freearray(a); return err; }
+
+ err = fz_arraypush(a, o);
+ if (err) { fz_dropobj(o); *obj = nil; fz_freearray(a); return err; }
+
+ fz_dropobj(o);
+ }
+
+ *sp = s;
+ return nil;
+}
+
+static fz_error *parsestring(fz_obj **obj, char **sp)
+{
+ char buf[512];
+ char *s = *sp;
+ char *p = buf;
+ int balance = 1;
+ int oct;
+
+ s ++; /* skip '(' */
+
+ while (*s && p < buf + sizeof buf)
+ {
+ if (*s == '(')
+ {
+ balance ++;
+ *p++ = *s++;
+ }
+ else if (*s == ')')
+ {
+ balance --;
+ *p++ = *s++;
+ }
+ else if (*s == '\\')
+ {
+ s ++;
+ if (*s >= '0' && *s <= '9')
+ {
+ oct = *s - '0';
+ s ++;
+ if (*s >= '0' && *s <= '9')
+ {
+ oct = oct * 8 + (*s - '0');
+ s ++;
+ if (*s >= '0' && *s <= '9')
+ {
+ oct = oct * 8 + (*s - '0');
+ s ++;
+ }
+ }
+ *p++ = oct;
+ }
+ else switch (*s)
+ {
+ case 'n': *p++ = '\n'; s++; break;
+ case 'r': *p++ = '\r'; s++; break;
+ case 't': *p++ = '\t'; s++; break;
+ case 'b': *p++ = '\b'; s++; break;
+ case 'f': *p++ = '\f'; s++; break;
+ default: *p++ = *s++; break;
+ }
+ }
+ else
+ *p++ = *s++;
+
+ if (balance == 0)
+ break;
+ }
+
+ *sp = s;
+ return fz_newstring(obj, buf, p - buf - 1);
+}
+
+static fz_error *parsehexstring(fz_obj **obj, char **sp)
+{
+ char buf[512];
+ char *s = *sp;
+ char *p = buf;
+ int a, b;
+
+ s ++; /* skip '<' */
+
+ while (*s && p < buf + sizeof buf)
+ {
+ skipwhite(&s);
+ if (*s == '>') {
+ s ++;
+ break;
+ }
+ a = *s++;
+
+ if (*s == '\0')
+ break;
+
+ skipwhite(&s);
+ if (*s == '>') {
+ s ++;
+ break;
+ }
+ b = *s++;
+
+ *p++ = fromhex(a) * 16 + fromhex(b);
+ }
+
+ *sp = s;
+ return fz_newstring(obj, buf, p - buf);
+}
+
+static fz_error *parseobj(fz_obj **obj, char **sp, struct vap *v)
+{
+ fz_error *err;
+ char buf[32];
+ int oid, gid, len;
+ char *tmp;
+ char *s = *sp;
+
+ if (*s == '\0')
+ return fz_throw("syntaxerror in parseobj: end-of-string");
+
+ skipwhite(&s);
+
+ err = nil;
+
+ if (v != nil && *s == '%')
+ {
+ s ++;
+ switch (*s)
+ {
+ case 'o': *obj = fz_keepobj(va_arg(v->ap, fz_obj*)); break;
+ case 'b': err = fz_newbool(obj, va_arg(v->ap, int)); break;
+ case 'i': err = fz_newint(obj, va_arg(v->ap, int)); break;
+ case 'f': err = fz_newreal(obj, (float)va_arg(v->ap, double)); break;
+ case 'n': err = fz_newname(obj, va_arg(v->ap, char*)); break;
+ case 'r':
+ oid = va_arg(v->ap, int);
+ gid = va_arg(v->ap, int);
+ err = fz_newindirect(obj, oid, gid);
+ break;
+ case 's':
+ tmp = va_arg(v->ap, char*);
+ err = fz_newstring(obj, tmp, strlen(tmp));
+ break;
+ case '#':
+ tmp = va_arg(v->ap, char*);
+ len = va_arg(v->ap, int);
+ err = fz_newstring(obj, tmp, len);
+ break;
+ default:
+ err = fz_throw("unknown format specifier in packobj: '%c'", *s);
+ break;
+ }
+ s ++;
+ }
+
+ else if (*s == '/')
+ err = parsename(obj, &s);
+
+ else if (*s == '(')
+ err = parsestring(obj, &s);
+
+ else if (*s == '<') {
+ if (s[1] == '<')
+ err = parsedict(obj, &s, v);
+ else
+ err = parsehexstring(obj, &s);
+ }
+
+ else if (*s == '[')
+ err = parsearray(obj, &s, v);
+
+ else if (*s == '-' || *s == '.' || (*s >= '0' && *s <= '9'))
+ err = parsenumber(obj, &s);
+
+ else if (isregular(*s))
+ {
+ parsekeyword(&s, buf, buf + sizeof buf);
+
+ if (strcmp("true", buf) == 0)
+ err = fz_newbool(obj, 1);
+ else if (strcmp("false", buf) == 0)
+ err = fz_newbool(obj, 0);
+ else if (strcmp("null", buf) == 0)
+ err = fz_newnull(obj);
+ else
+ err = fz_throw("syntaxerror in parseobj: undefined keyword %s", buf);
+ }
+
+ else
+ err = fz_throw("syntaxerror in parseobj");
+
+ *sp = s;
+ return err;
+}
+
+fz_error *
+fz_packobj(fz_obj **op, char *fmt, ...)
+{
+ fz_error *err;
+ struct vap v;
+ va_list ap;
+
+ va_start(ap, fmt);
+ va_copy(v.ap, ap);
+
+ err = parseobj(op, &fmt, &v);
+
+ va_end(ap);
+
+ return err;
+}
+
+fz_error *
+fz_parseobj(fz_obj **op, char *str)
+{
+ return parseobj(op, &str, nil);
+}
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-03-20 01:34:54 +0000