symtab.dc

来自「Object-Oriented Programming With ANSI-C这」· DC 代码 · 共 64 行

#include <stdlib.h>
#include <string.h>
#include "binary.h"

#include "Symbol.h"

% Symtab ctor {
	struct Symtab * self = super_ctor(Symtab(), _self, app);

	if (! (self -> dim = va_arg(* app, size_t)))
		self -> dim = 1;

	self -> buf = malloc(self -> dim * sizeof(void *));
	assert(self -> buf);
	return self;
}

% : Symtab delete {		// don't delete
}

static int cmp (const void * _key, const void * _elt)
{	const char * const * key = _key;
	const void * const * elt = _elt;

	return strcmp(* key, name(* elt));
}

static void ** search (struct Symtab * self, const char ** np)
{
	if (self -> count >= self -> dim)
	{	self -> buf = realloc(self -> buf,
						(self -> dim *= 2) * sizeof(void *));
		assert(self -> buf);
	}
	return binary(np, self -> buf, & self -> count,
										sizeof(void *), cmp);
}

% Symtab install {
	const char * nm;
	void ** pp;
%casts
	nm = name(entry);
	pp = search(self, & nm);
	if (* pp != nm)			// found entry
		delete(* pp);
	* pp = (void *) entry;
}

% Symtab screen {
	void ** pp;
%casts
	pp = search(self, & name);
	if (* pp == name)					// entered name
	{	char * copy = malloc(strlen(name) + 1);

		assert(copy);
		* pp = new(Symbol(), strcpy(copy, name), lex);
	}
	return * pp;
}

%init