91 lines
1.3 KiB
R
91 lines
1.3 KiB
R
#include "Symbol.h"
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#include "hash.h"
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#include "defs.h"
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string SymbolGetKey (void [] ele, void [] data)
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{
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local Symbol s = (Symbol) ele;
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return [s stringValue];
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}
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void SymbolFree (void [] ele, void [] data)
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{
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local Symbol s = (Symbol) ele;
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[s release];
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}
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hashtab_t symbols;
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Symbol lparen;
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Symbol rparen;
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Symbol quote;
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Symbol dot;
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Symbol symbol (string str)
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{
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return [Symbol forString: str];
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}
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@implementation Symbol
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+ (void) initialize
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{
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symbols = Hash_NewTable (1024, SymbolGetKey, SymbolFree, NIL);
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lparen = [Symbol forString: "("];
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rparen = [Symbol forString: ")"];
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quote = [Symbol forString: "'"];
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dot = symbol(".");
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[lparen retain];
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[rparen retain];
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[quote retain];
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[dot retain];
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}
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+ (Symbol) forString: (string) s
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{
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local Symbol res;
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if ((res = Hash_Find (symbols, s))) {
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return res;
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} else {
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res = (Symbol) [self newFromString: s];
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Hash_Add (symbols, res);
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return res;
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}
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}
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+ (Symbol) leftParen
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{
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return lparen;
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}
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+ (Symbol) rightParen
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{
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return rparen;
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}
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+ (Symbol) quote
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{
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return quote;
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}
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+ (Symbol) dot
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{
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return dot;
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}
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- (string) printForm
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{
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return value;
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}
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- (void) dealloc
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{
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if (Hash_Find (symbols, value) == self) {
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Hash_Del (symbols, value);
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}
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[super dealloc];
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}
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@end
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