Cleaned up Cmd_Args. It is no longer uselessly built up in

Cmd_TokenizeString since I realized the code was just pulling it apart and
putting it back together.  Added Cmd_Argsu to access the unprocessed
command.  Added support for else following if in such a way that
if/else if/else structures work.  Added support for unary operators in
EXP and added the ! (not) operator.  The ifnot command will be kept
for variety.

include/QF/cmd.h

@@ -58,6 +58,7 @@ typedef struct cmd_buffer_s {
 	struct dstring_s *looptext; // If a looping buffer, the text we are looping on
 	struct dstring_s *retval; // Return value
 	unsigned int *args; // Array of positions of each token in composite line
+	unsigned int *argsu; // Array of positions of each token in original line
 	struct hashtab_s *locals; // Local variables
 	
 	// Flags

include/QF/exp.h

@@ -59,6 +59,7 @@ typedef struct optable_s
 {
 	char *str;
 	opfunc func;
+	unsigned int operands;
 } optable_t;
 
 extern exp_error_t EXP_ERROR;

include/QF/ops.h

@@ -22,6 +22,7 @@
 #ifndef __ops_h
 #define __ops_h
 
+float OP_Not (float op1, float op2);
 float OP_Add (float op1, float op2);
 float OP_Sub (float op1, float op2);
 float OP_Mult (float op1, float op2);

libs/util/cmd.c

@@ -854,6 +854,13 @@ Cmd_Args (int start)
 	return cmd_activebuffer->line->str + cmd_activebuffer->args[start];
 }
 
+const char *
+Cmd_Argsu (int start)
+{
+	if (start >= cmd_activebuffer->argc)
+		return "";
+	return cmd_activebuffer->realline->str + cmd_activebuffer->argsu[start];
+}
 
 int
 Cmd_EndDoubleQuote (const char *str)
@@ -1371,7 +1378,7 @@ Cmd_Process (void)
 		cmd_activebuffer->args[arg] += adj;
 		adj += (str->size - 1) - (org->size - 1);
 		dstring_replace (cmd_activebuffer->line, str->str, str->size - 1,
-						 cmd_activebuffer->args[arg] + quotes, org->size - 1);
+						 cmd_activebuffer->args[arg] + quotes + (cmd_activebuffer->argv[arg]->delim == '{'), org->size - 1);
 	}
 	return 0;
 }
@@ -1387,6 +1394,8 @@ Cmd_TokenizeString (const char *text, qboolean legacy)
 
 	dstring_clearstr (cmd_activebuffer->realline);
 	dstring_appendstr (cmd_activebuffer->realline, text);
+	dstring_clearstr (cmd_activebuffer->line);
+	dstring_appendstr (cmd_activebuffer->line, text);
 
 	/* Turn off tags at the beginning of a command. This causes tags to
 	   continue past token boundaries. */
@@ -1394,7 +1403,6 @@ Cmd_TokenizeString (const char *text, qboolean legacy)
 	tag_special = 0;
 	if (text[0] == '|')
 		str++;
-	dstring_clearstr (cmd_activebuffer->line);
 	while (strlen (str + i)) {
 		if (!legacy && cmd_argc == 1) { // See if command wants unprocessed tokens
 			cmd = (cmd_function_t *) Hash_Find (cmd_hash, cmd_activebuffer->argv[0]->original->str);
@@ -1406,8 +1414,6 @@ Cmd_TokenizeString (const char *text, qboolean legacy)
 			i++;
 			space++;
 		}
-		if (space)
-			dstring_appendsubstr (cmd_activebuffer->line, str + i - space, space);
 		len = Cmd_GetToken (str + i, legacy);
 		if (len < 0) {
 			Cmd_Error ("Parse error:  Unmatched quotes, braces, or "
@@ -1421,6 +1427,9 @@ Cmd_TokenizeString (const char *text, qboolean legacy)
 			cmd_activebuffer->argv = realloc (cmd_activebuffer->argv,
 											  sizeof (cmd_token_t *) * cmd_argc);
 			SYS_CHECKMEM (cmd_activebuffer->argv);
+			cmd_activebuffer->argsu = realloc (cmd_activebuffer->argsu,
+											  sizeof (int) * cmd_argc);
+			SYS_CHECKMEM (cmd_activebuffer->argsu);
 
 			cmd_activebuffer->args = realloc (cmd_activebuffer->args,
 											  sizeof (int) * cmd_argc);
@@ -1434,6 +1443,7 @@ Cmd_TokenizeString (const char *text, qboolean legacy)
 		/* Remove surrounding quotes or double quotes or braces */
 		quotes = 0;
 		braces = 0;
+		cmd_activebuffer->argsu[cmd_argc - 1] = i;
 		cmd_activebuffer->args[cmd_argc - 1] = i;
 		cmd_activebuffer->argv[cmd_argc - 1]->delim = ' ';
 		if ((!legacy && str[i] == '\'' && str[i + len] == '\'')
@@ -1443,8 +1453,6 @@ Cmd_TokenizeString (const char *text, qboolean legacy)
 			len -= 1;
 			quotes = 1;
 		}
-		dstring_appendsubstr (cmd_activebuffer->line,
-							  str + i - quotes, len + quotes * 2);
 		if (str[i] == '{' && str[i + len] == '}') {
 			i++;
 			len -= 1;
@@ -1893,11 +1901,21 @@ Cmd_If_f (void)
 {
 	long int    num;
 
-	if (Cmd_Argc () < 3) {
-		Sys_Printf ("Usage: if {condition} {commands}\n");
+	if ((Cmd_Argc () !=3 && !(Cmd_Argc () >= 5)) || (Cmd_Argc () > 5 && strcmp(Cmd_Argv(3),"else"))) {
+		Sys_Printf ("Usage: if {condition} {commands} else {commands}\n");
 		return;
 	}
 
+	/* HACK HACK HACK
+	If is set as a pure command, but it needs the first argument
+	to be evaluated.  Normally this would mean Cmd_Args is out
+	of sync, but since if uses Cmd_Argsu (4) and no other commands
+	will need these tokens, it is safe.
+	*/
+	if (Cmd_ProcessToken (cmd_activebuffer->argv[1]) < 0)
+		return;
+	cmd_activebuffer->argv[1]->state = cmd_done;
+
 	num = strtol (Cmd_Argv(1), 0, 10);
 
 	if (!strcmp(Cmd_Argv(0), "ifnot"))
@@ -1905,6 +1923,11 @@ Cmd_If_f (void)
 
 	if (num)
 		Cbuf_InsertText (Cmd_Argv (2));
+	if (!num && Cmd_Argc() == 5)
+		Cbuf_InsertText (Cmd_Argv (4));
+	if (!num && Cmd_Argc() > 5) {
+		Cbuf_InsertText (Cmd_Argsu (4));
+	}
 	return;
 }
 
@@ -2116,6 +2139,7 @@ Cmd_Init (void)
 					"variable");
 
 	Cmd_AddCommand ("if", Cmd_If_f, "Conditionally execute a set of commands.");
+	Cmd_SetPure ("if");
 	Cmd_AddCommand ("ifnot", Cmd_If_f, "Conditionally execute a set of commands if the condition is false.");
 	Cmd_AddCommand ("while", Cmd_While_f, "Execute a set of commands while a condition is true.");
 	Cmd_SetPure ("while");

libs/util/exp.c

@@ -32,19 +32,22 @@ exp_error_t EXP_ERROR;
 
 optable_t optable[] = 
 {
-	{"**", OP_Exp},
-	{"/", OP_Div},
-	{"*", OP_Mult},
-	{"+", OP_Add},
-	{"-", OP_Sub},
-	{"==", OP_Eq},
-	{"!=", OP_Neq},
-	{">=", OP_GreaterThanEqual},
-	{">", OP_GreaterThan},
-	{"<=", OP_LessThanEqual},
-	{"<", OP_LessThan},
-	{"||", OP_Or},
-	{"&&", OP_And},
+	{"!", OP_Not, 1},
+	{"**", OP_Exp, 2},
+	{"/", OP_Div, 2},
+	{"*", OP_Mult, 2},
+	{"+", OP_Add, 2},
+	{"-", OP_Sub, 2},
+	{"==", OP_Eq, 2},
+	{"!=", OP_Neq, 2},
+	{">=", OP_GreaterThanEqual, 2},
+	{">", OP_GreaterThan, 2},
+	{"<=", OP_LessThanEqual, 2},
+	{"<", OP_LessThan, 2},
+	{"||", OP_Or, 2},
+	{"or", OP_Or, 2},
+	{"&&", OP_And, 2},
+	{"and", OP_And, 2},
 	{"", 0}
 };
 
@@ -60,12 +63,33 @@ token *EXP_NewToken (void)
 	return new;
 }
 
+int EXP_FindIndexByFunc (opfunc func)
+{
+	int i;
+	for (i = 0; optable[i].func; i++)
+		if (func == optable[i].func)
+			return i;
+	return -1;
+}
+
+int EXP_FindIndexByStr (const char *str)
+{
+	int i, len, fi;
+
+	for (i = 0, len = 0, fi = -1; optable[i].func; i++)
+		if (!strncmp(str, optable[i].str, strlen(optable[i].str)) && strlen(optable[i].str) > len) {
+			len = strlen(optable[i].str);
+			fi = i;
+		}
+	return fi;
+}
+
 token *EXP_ParseString (char *str)
 {
 	char buf[256];
 
 	token *chain, *new, *cur;
-	int i,n,m;
+	int i,m,fi;
 
 	cur = chain = EXP_NewToken();
 	chain->generic.type = TOKEN_OPAREN;
@@ -75,8 +99,10 @@ token *EXP_ParseString (char *str)
 	for (i = 0; i < strlen(str); i++)
 	{
 		m = 0;
-		while(str[i] == ' ')
+		while(isspace((byte)str[i]))
 			i++;
+		if (!str[i])
+			break;
 		if (isdigit((byte)str[i]) || str[i] == '.')
 		{
 			while ((isdigit((byte)str[i]) || str[i] == '.') && i < strlen(str) && m < 256)
@@ -111,27 +137,23 @@ token *EXP_ParseString (char *str)
 		}
 		else
 		{
-			while(!(isdigit((byte)str[i])) && str[i] != '.' && str[i] != '(' && str[i] != ')' && m < 256)
+			while(!(isdigit((byte)str[i])) && !isspace((byte)str[i]) && str[i] != '.' && str[i] != '(' && str[i] != ')' && m < 256) {
 					buf[m++] = str[i++];
+			}
 			buf[m] = 0;
 			if (m)
 			{
-				for (n = 0; optable[n].func; n++)
-				{
-					if (!(strncmp(optable[n].str, buf, strlen(optable[n].str))))
-					{
-						i -= (m - strlen(optable[n].str) + 1);
+				fi = EXP_FindIndexByStr (buf);
+				if (fi != -1) {
+					i -= (m - strlen(optable[fi].str) + 1);
 					new = EXP_NewToken();
 					new->generic.type = TOKEN_OP;
-						new->op.func = optable[n].func;
+					new->op.func = optable[fi].func;
 					new->generic.prev = cur;
 					new->generic.next = 0;
 					cur->generic.next = new;
 					cur = new;
-						break;
-					}
-				}
-				if (!(optable[n].func)) {
+				} else {
 					EXP_DestroyTokens (chain);
 					return 0;
 				}
@@ -172,8 +194,14 @@ void EXP_SimplifyTokens (token *chain)
 	{
 		for (cur = chain->generic.next; cur->generic.type != TOKEN_CPAREN; cur = cur->generic.next)
 		{
-			if (cur->generic.type == TOKEN_OP && cur->op.func == optable[i].func && cur->generic.next)
-				if (cur->generic.prev->generic.type == TOKEN_NUM && cur->generic.next->generic.type == TOKEN_NUM)
+			if (cur->generic.type == TOKEN_OP && cur->op.func == optable[i].func && cur->generic.next) {
+				if (optable[i].operands == 1 && cur->generic.next->generic.type == TOKEN_NUM) {
+					cur->generic.next->num.value = optable[i].func(cur->generic.next->num.value, 0);
+					temp = cur;
+					cur = cur->generic.next;
+					EXP_RemoveToken(temp);
+				}
+				else if (cur->generic.prev->generic.type == TOKEN_NUM && cur->generic.next->generic.type == TOKEN_NUM)
 				{
 					cur->generic.prev->num.value = optable[i].func(cur->generic.prev->num.value, cur->generic.next->num.value);
 					temp = cur;
@@ -184,6 +212,7 @@ void EXP_SimplifyTokens (token *chain)
 			}
 		}
 	}
+}
 
 void EXP_RemoveToken (token *tok)
 {
@@ -273,7 +302,7 @@ exp_error_t EXP_Validate (token *chain)
 				new->op.func = OP_Mult;
 				EXP_InsertTokenAfter (cur, new);
 			}
-			else
+			else if (optable[EXP_FindIndexByFunc(cur->generic.next->op.func)].operands == 2)
 				return EXP_E_SYNTAX; /* Operator misuse */
 		}
 		else if (cur->generic.type == TOKEN_OP && cur->generic.next->generic.type == TOKEN_CPAREN)
@@ -312,4 +341,5 @@ void EXP_PrintTokens (token *chain)
 			case TOKEN_GENERIC:
 				break;
 		}
+	printf("\n");
 }

libs/util/ops.c

@@ -21,6 +21,11 @@
 
 #include <math.h>
 
+float OP_Not (float op1, float op2)
+{
+	return !op1;
+}
+
 float OP_Add (float op1, float op2)
 {
 	return op1 + op2;