20060303a

1 files changed, 99 insertions, 0 deletions

diff --git a/appl/lib/tcl_symhash.b b/appl/lib/tcl_symhash.b
new file mode 100644
index 00000000..f5783eaa
--- /dev/null
+++ b/appl/lib/tcl_symhash.b
@@ -0,0 +1,99 @@
+implement Sym_Hashtab;
+
+include "sys.m";
+include "draw.m";
+include "tk.m";
+include "tcl.m";
+include "tcllib.m";
+include "utils.m";
+
+
+hashasu(key : string,n : int): int{
+        i, h : int;
+	h=0;
+	i=0;
+        while(i<len key){
+                h = 10*h + key[i];
+		h = h%n;
+		i++;
+	}
+        return h%n;
+}
+
+alloc(size : int) : ref SHash {
+	h : SHash;
+	t : list of H_link;
+	t=nil;
+	h.size= size;
+	h.tab = array[size]  of {* => t};
+	return ref h;
+}
+
+
+SHash.insert(h : self ref SHash,name,alias: string,val:int) : int {
+	link : H_link;
+	hash,found : int;
+	nlist : list of H_link;
+	nlist=nil;
+	found=0;
+	hash = hashasu(name,h.size);
+	tmp:=(h.tab)[hash];
+	for(;tmp!=nil;tmp = tl tmp){
+		link=hd tmp;
+		if (link.name==name){
+			found=1;
+			link.val = val;
+			link.alias = alias;
+		}
+		nlist = link :: nlist;
+	}
+	if (!found){
+		link.name=name;
+		link.val=val;
+		link.alias = alias;
+		(h.tab)[hash]= link :: (h.tab)[hash];
+	}else
+		(h.tab)[hash]=nlist;
+	return 1;
+}
+
+SHash.find(h : self ref SHash,name : string) : (int, int,string){
+	hash,flag : int;
+	nlist : list of H_link;
+	al : string;
+	retval:=0;
+	flag=0;
+	nlist=nil;
+	hash = hashasu(name,h.size);
+	tmp:=(h.tab)[hash];
+	for(;tmp!=nil;tmp = tl tmp){
+		link:=hd tmp;
+		if ((hd tmp).name==name){
+			flag = 1;
+			retval = (hd tmp).val;
+			al = (hd tmp).alias;
+		}
+		nlist = link :: nlist;
+	}
+	(h.tab)[hash]=nlist;
+	return (flag,retval,al);
+}	
+
+SHash.delete(h : self ref SHash,name : string) : int {
+	hash,flag : int;
+	nlist : list of H_link;
+	flag=0;
+	nlist=nil;
+	hash = hashasu(name,h.size);
+	tmp:=(h.tab)[hash];
+	for(;tmp!=nil;tmp = tl tmp){
+		link:=hd tmp;
+		if (link.name==name)
+			flag = 1;
+		else
+			nlist = link :: nlist;
+	}
+	(h.tab)[hash]=nlist;
+	return flag;
+}
+