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(Finally!) commit the property list parser.

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Jeff Teunissen 2001-02-15 17:18:45 +00:00
parent e5cd5030ae
commit e1638eba85
2 changed files with 547 additions and 0 deletions
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102
include/qfplist.h Normal file
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/*
qfplist.h
Property list management types and prototypes
Copyright (C) 2000 Jeff Teunissen <deek@dusknet.dhs.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifndef __qfplist_h_
#define __qfplist_h_
#include "qtypes.h"
// Ugly defines for fast checking and conversion from char to number
#define inrange(ch,min,max) ((ch) >= (min) && (ch) <= (max))
#define char2num(ch) \
inrange(ch, '0', '9') ? (ch - 0x30) \
: (inrange(ch, 'a', 'f') ? (ch - 0x57) : (ch - 0x37))
// Maximum number of items in an array
#define MAX_ARRAY_INDEX 128
typedef enum {QFDictionary, QFArray, QFBinary, QFString} pltype_t; // possible types
struct plitem_s {
struct plitem_s *next; // Pointer to next item
pltype_t type; // Type
union shared { // Type-dependant data
struct dict_s *dict;
struct array_s *array;
void *binary;
char *string;
} data;
};
/*
Dictionaries
*/
struct dict_s {
int numkeys; // Number of items in dictionary
struct dictkey_s *keys;
};
struct dictkey_s {
struct dictkey_s *next;
struct plitem_s *key;
struct plitem_s *value;
};
/*
Arrays
*/
struct array_s {
int numvals; // Number of items in array
struct plitem_s *values[MAX_ARRAY_INDEX+1]; // Array data
};
// now that we've defined the structs, define their types so we can use them
typedef struct plitem_s plitem_t;
typedef struct dict_s dict_t;
typedef struct dictkey_s dictkey_t;
typedef struct array_s array_t;
typedef struct pldata_s { // Unparsed property list string
const char *ptr;
unsigned int end;
unsigned int pos;
unsigned int line;
char *error;
} pldata_t;
static plitem_t *PL_GetPropertyList (const char *);
/*
Internal prototypes
static plist_t *PL_ParsePropertyList (pldata_t *);
static qboolean PL_SkipSpace (pldata_t *);
static char *PL_ParseQuotedString (pldata_t *);
static char *PL_ParseUnquotedString (pldata_t *);
*/
#endif // __qfplist_h_

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source/qfplist.c Normal file
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/*
qfplist.c
Property list management
Copyright (C) 2000 Jeff Teunissen <deek@dusknet.dhs.org>
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
$Id$
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include "qfplist.h"
#include "qtypes.h"
static plitem_t *PL_ParsePropertyListItem (pldata_t *);
static qboolean PL_SkipSpace (pldata_t *);
static char *PL_ParseQuotedString (pldata_t *);
static char *PL_ParseUnquotedString (pldata_t *);
static qboolean
PL_SkipSpace (pldata_t *pl)
{
while (pl->pos < pl->end) {
char c = pl->ptr[pl->pos];
if (!isspace (c)) {
if (c == '/' && pl->pos < pl->end - 1) { // check for comments
if (pl->ptr[pl->pos + 1] == '/') {
pl->pos += 2;
while (pl->pos < pl->end) {
c = pl->ptr[pl->pos];
if (c == '\n')
break;
pl->pos++;
}
if (pl->pos >= pl->end) {
pl->error = "Reached end of string in comment";
return false;
}
} else if (pl->ptr[pl->pos + 1] == '*') { // "/*" comments
pl->pos += 2;
while (pl->pos < pl->end) {
c = pl->ptr[pl->pos];
if (c == '\n') {
pl->line++;
} else if (c == '*' && pl->pos < pl->end - 1
&& pl->ptr[pl->pos+1] == '/') {
pl->pos++;
break;
}
pl->pos++;
}
if (pl->pos >= pl->end) {
pl->error = "Reached end of string in comment";
return false;
}
} else {
return true;
}
} else {
return true;
}
}
if (c == '\n') {
pl->line++;
}
pl->pos++;
}
pl->error = "Reached end of string";
return false;
}
static char *
PL_ParseQuotedString (pldata_t *pl)
{
unsigned int start = ++pl->pos;
unsigned int escaped = 0;
unsigned int shrink = 0;
qboolean hex = false;
char *str;
while (pl->pos < pl->end) {
char c = pl->ptr[pl->pos];
if (escaped) {
if (escaped == 1 && c == '0') {
escaped++;
hex = false;
} else if (escaped > 1) {
if (escaped == 2 && c == 'x') {
hex = true;
shrink++;
escaped++;
} else if (hex && isxdigit (c)) {
shrink++;
escaped++;
} else if (c >= '0' && c <= '7') {
shrink++;
escaped++;
} else {
pl->pos--;
escaped = 0;
}
} else {
escaped = 0;
}
} else {
if (c == '\\') {
escaped = 1;
shrink++;
} else if (c == '"') {
break;
}
}
if (c == '\n') {
pl->line++;
}
pl->pos++;
}
if (pl->pos >= pl->end) {
pl->error = "Reached end of string while parsing quoted string";
return NULL;
}
if (pl->pos - start - shrink == 0) {
str = "";
} else {
char chars[pl->pos - start - shrink];
unsigned int j;
unsigned int k;
escaped = 0;
hex = false;
for (j = start, k = 0; j < pl->pos; j++) {
char c = pl->ptr[j];
if (escaped) {
if (escaped == 1 && c == '0') {
chars[k] = 0;
hex = false;
escaped++;
} else if (escaped > 1) {
if (escaped == 2 && c == 'x') {
hex = true;
escaped++;
} else if (hex && isxdigit (c)) {
chars[k] <<= 4;
chars[k] |= char2num (c);
escaped++;
} else if (inrange (c, '0', '7')) {
chars[k] <<= 3;
chars[k] |= (c - '0');
escaped++;
} else {
escaped = 0;
j--;
k++;
}
} else {
escaped = 0;
switch (c) {
case 'a':
chars[k] = '\a';
break;
case 'b':
chars[k] = '\b';
break;
case 't':
chars[k] = '\t';
break;
case 'r':
chars[k] = '\r';
break;
case 'n':
chars[k] = '\n';
break;
case 'v':
chars[k] = '\v';
break;
case 'f':
chars[k] = '\f';
break;
default:
chars[k] = c;
break;
}
k++;
}
} else {
chars[k] = c;
if (c == '\\') {
escaped = 1;
} else {
k++;
}
}
}
str = strncat (calloc ((pl->pos - start - shrink) + 1, 1), chars, pl->pos - start - shrink);
}
pl->pos++;
return str;
}
static char *
PL_ParseUnquotedString (pldata_t *pl)
{
unsigned int start = pl->pos;
char *str;
while (pl->pos < pl->end) {
if (!isalnum (pl->ptr[pl->pos]))
break;
pl->pos++;
}
str = strncat (calloc ((pl->pos - start) + 1, 1), &pl->ptr[start], pl->pos - start);
return str;
}
static plitem_t *
PL_ParsePropertyListItem (pldata_t *pl)
{
plitem_t *item = NULL;
if (!PL_SkipSpace (pl))
return NULL;
switch (pl->ptr[pl->pos]) {
case '{': {
dict_t *dict = calloc (1, sizeof (dict_t));
pl->pos++;
while (PL_SkipSpace (pl) && pl->ptr[pl->pos] != '}') {
plitem_t *key;
plitem_t *value;
if (!(key = PL_ParsePropertyListItem (pl)))
return NULL;
if (!(PL_SkipSpace (pl))) {
free (key);
return NULL;
}
if (pl->ptr[pl->pos] != '=') {
pl->error = "Unexpected character (wanted '=')";
free (key);
return NULL;
}
pl->pos++;
// If there is no value, lose the key
if (!(value = PL_ParsePropertyListItem (pl))) {
free (key);
return NULL;
}
if (!(PL_SkipSpace (pl))) {
free (key);
free (value);
return NULL;
}
if (pl->ptr[pl->pos] == ';') {
pl->pos++;
} else if (pl->ptr[pl->pos] != '}') {
pl->error = "Unexpected character (wanted ';' or '}')";
free (key);
free (value);
return NULL;
}
// Add the key/value pair to the dict
if (!(dict->keys)) { // No keys, add one
dictkey_t *k = calloc (1, sizeof (dictkey_t));
if (!k) {
free (key);
free (value);
return NULL;
}
k->key = key;
k->value = value;
dict->keys = k;
} else {
dictkey_t *k;
for (k = dict->keys; k; k = k->next) { // add to end
if (k->next == NULL) {
dictkey_t *k2 = calloc (1, sizeof (dictkey_t));
if (!k2) {
free (key);
free (value);
return NULL;
}
k2->key = key;
k2->value = value;
k = k2;
break;
}
}
}
dict->numkeys++;
}
if (pl->pos >= pl->end) { // Catch the error
pl->error = "Unexpected end of string when parsing dictionary";
free (dict);
return NULL;
}
pl->pos++;
item = calloc (1, sizeof (plitem_t));
item->type = QFDictionary;
item->data.dict = dict;
return item;
}
case '(': {
array_t *a = calloc (1, sizeof (array_t));
pl->pos++;
while (PL_SkipSpace (pl) && pl->ptr[pl->pos] != ')') {
plitem_t *value;
if (!(value = PL_ParsePropertyListItem (pl)))
return NULL;
if (!(PL_SkipSpace (pl))) {
free (value);
return NULL;
}
if (pl->ptr[pl->pos] == ',') {
pl->pos++;
} else if (pl->ptr[pl->pos] != ')') {
pl->error = "Unexpected character (wanted ',' or ')')";
free (value);
return NULL;
}
if (a->numvals == MAX_ARRAY_INDEX) {
pl->error = "Unexpected character (too many items in array)";
free (value);
return NULL;
}
a->values[a->numvals++] = value;
}
pl->pos++;
item = calloc (1, sizeof (plitem_t));
item->type = QFArray;
item->data.array = a;
return item;
}
case '<':
pl->error = "Unexpected character in string (binary data unsupported)";
return NULL;
case '"': {
char *str = PL_ParseQuotedString (pl);
if (!str) {
return NULL;
} else {
item = calloc (1, sizeof (plitem_t));
item->type = QFString;
item->data.string = str;
return item;
}
}
default: {
char *str = PL_ParseUnquotedString (pl);
if (!str) {
return NULL;
} else {
item = calloc (1, sizeof (plitem_t));
item->type = QFString;
item->data.string = str;
return item;
}
}
} // switch
}
static plitem_t *
PL_GetPropertyList (const char *string)
{
pldata_t *pl = calloc (1, sizeof (pldata_t));
pl->ptr = string;
pl->pos = 0;
pl->end = strlen (string);
pl->error = NULL;
pl->line = 1;
return PL_ParsePropertyListItem (pl);
}