75 lines
1.1 KiB
R
75 lines
1.1 KiB
R
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#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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@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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}
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+ (Symbol) forString: (string) s
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{
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return (Symbol) [self newFromString: s];
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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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- (id) initWithString: (string) s
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{
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local Symbol res;
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[super initWithString: s];
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if ((res = Hash_Find (symbols, s))) {
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[self release];
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return res;
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} else {
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Hash_Add (symbols, self);
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return self;
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}
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}
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- (string) printForm
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{
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return [self stringValue];
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}
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@end
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