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new parameter in function 'tree_create'. Maybe we will return to

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version 1.1
This commit is contained in:
Waldemar Celes 1994-10-18 15:36:11 -02:00
parent f84abc6799
commit d7cb47fadf
1 changed files with 21 additions and 7 deletions
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28
tree.c
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@ -3,7 +3,7 @@
** TecCGraf - PUC-Rio
*/
char *rcs_tree="$Id: $";
char *rcs_tree="$Id: tree.c,v 1.1 1994/07/19 21:24:17 celes Exp $";
#include <stdlib.h>
@ -11,6 +11,7 @@ char *rcs_tree="$Id: $";
#include "lua.h"
#include "tree.h"
#include "table.h"
#define lua_strcmp(a,b) (a[0]<b[0]?(-1):(a[0]>b[0]?(1):strcmp(a,b)))
@ -31,7 +32,7 @@ static TreeNode *variable_root = NULL;
/*
** Insert a new string/constant/variable at the tree.
*/
static char *tree_create (TreeNode **node, char *str)
static char *tree_create (TreeNode **node, char *str, int *created)
{
if (*node == NULL)
{
@ -41,15 +42,16 @@ static char *tree_create (TreeNode **node, char *str)
(*node)->left = (*node)->right = NULL;
strcpy((*node)->str, str);
(*node)->index = UNMARKED_STRING;
*created = 1;
return (*node)->str;
}
else
{
int c = lua_strcmp(str, (*node)->str);
if (c < 0)
return tree_create(&(*node)->left, str);
return tree_create(&(*node)->left, str, created);
else if (c > 0)
return tree_create(&(*node)->right, str);
return tree_create(&(*node)->right, str, created);
else
return (*node)->str;
}
@ -57,17 +59,26 @@ static char *tree_create (TreeNode **node, char *str)
char *lua_strcreate (char *str)
{
return tree_create(&string_root, str);
int created=0;
char *s = tree_create(&string_root, str, &created);
if (created)
{
if (lua_nentity == lua_block) lua_pack ();
lua_nentity++;
}
return s;
}
char *lua_constcreate (char *str)
{
return tree_create(&constant_root, str);
int created;
return tree_create(&constant_root, str, &created);
}
char *lua_varcreate (char *str)
{
return tree_create(&variable_root, str);
int created;
return tree_create(&variable_root, str, &created);
}
@ -131,7 +142,10 @@ static TreeNode *lua_travcollector (TreeNode *r)
r->right = lua_travcollector(r->right);
r->left = lua_travcollector(r->left);
if (r->index == UNMARKED_STRING)
{
++lua_recovered;
return lua_strfree(r);
}
else
{
r->index = UNMARKED_STRING;