зеркало из https://github.com/github/ruby.git
487 строки
10 KiB
C
487 строки
10 KiB
C
/**********************************************************************
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range.c -
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$Author$
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$Date$
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created at: Thu Aug 19 17:46:47 JST 1993
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Copyright (C) 1993-2003 Yukihiro Matsumoto
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**********************************************************************/
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#include "ruby.h"
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VALUE rb_cRange;
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static ID id_cmp, id_succ, id_beg, id_end, id_excl;
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#define EXCL(r) RTEST(rb_ivar_get((r), id_excl))
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#define SET_EXCL(r,v) rb_ivar_set((r), id_excl, (v) ? Qtrue : Qfalse)
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static VALUE
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range_failed()
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{
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rb_raise(rb_eArgError, "bad value for range");
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return Qnil; /* dummy */
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}
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static VALUE
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range_check(args)
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VALUE *args;
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{
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VALUE v;
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v = rb_funcall(args[0], id_cmp, 1, args[1]);
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if (NIL_P(v)) range_failed();
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return Qnil;
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}
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static void
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range_init(range, beg, end, exclude_end)
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VALUE range, beg, end;
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int exclude_end;
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{
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VALUE args[2];
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args[0] = beg;
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args[1] = end;
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if (!FIXNUM_P(beg) || !FIXNUM_P(end)) {
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rb_rescue(range_check, (VALUE)args, range_failed, 0);
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}
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SET_EXCL(range, exclude_end);
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rb_ivar_set(range, id_beg, beg);
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rb_ivar_set(range, id_end, end);
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}
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VALUE
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rb_range_new(beg, end, exclude_end)
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VALUE beg, end;
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int exclude_end;
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{
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VALUE range = rb_obj_alloc(rb_cRange);
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range_init(range, beg, end, exclude_end);
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return range;
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}
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static VALUE
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range_initialize(argc, argv, range)
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int argc;
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VALUE *argv;
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VALUE range;
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{
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VALUE beg, end, flags;
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rb_scan_args(argc, argv, "21", &beg, &end, &flags);
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/* Ranges are immutable, so that they should be initialized only once. */
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if (rb_ivar_defined(range, id_beg)) {
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rb_name_error(rb_intern("initialize"), "`initialize' called twice");
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}
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range_init(range, beg, end, RTEST(flags));
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return Qnil;
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}
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static VALUE
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range_exclude_end_p(range)
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VALUE range;
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{
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return EXCL(range) ? Qtrue : Qfalse;
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}
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static VALUE
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range_eq(range, obj)
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VALUE range, obj;
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{
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if (range == obj) return Qtrue;
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if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
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return Qfalse;
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if (!rb_equal(rb_ivar_get(range, id_beg), rb_ivar_get(obj, id_beg)))
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return Qfalse;
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if (!rb_equal(rb_ivar_get(range, id_end), rb_ivar_get(obj, id_end)))
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return Qfalse;
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if (EXCL(range) != EXCL(obj)) return Qfalse;
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return Qtrue;
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}
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static int
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r_lt(a, b)
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VALUE a, b;
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{
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VALUE r = rb_funcall(a, id_cmp, 1, b);
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if (NIL_P(r)) return Qfalse;
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if (rb_cmpint(r, a, b) < 0) return Qtrue;
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return Qfalse;
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}
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static int
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r_le(a, b)
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VALUE a, b;
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{
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VALUE r = rb_funcall(a, id_cmp, 1, b);
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if (NIL_P(r)) return Qfalse;
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if (rb_cmpint(r, a, b) <= 0) return Qtrue;
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return Qfalse;
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}
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static VALUE
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range_eql(range, obj)
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VALUE range, obj;
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{
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if (range == obj) return Qtrue;
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if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
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return Qfalse;
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if (!rb_eql(rb_ivar_get(range, id_beg), rb_ivar_get(obj, id_beg)))
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return Qfalse;
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if (!rb_eql(rb_ivar_get(range, id_end), rb_ivar_get(obj, id_end)))
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return Qfalse;
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if (EXCL(range) != EXCL(obj)) return Qfalse;
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return Qtrue;
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}
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static VALUE
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range_hash(range)
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VALUE range;
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{
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long hash = EXCL(range);
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VALUE v;
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v = rb_hash(rb_ivar_get(range, id_beg));
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hash ^= v << 1;
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v = rb_hash(rb_ivar_get(range, id_end));
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hash ^= v << 9;
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hash ^= EXCL(range) << 24;
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return LONG2FIX(hash);
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}
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static VALUE
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str_step(args)
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VALUE *args;
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{
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return rb_str_upto(args[0], args[1], EXCL(args[2]));
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}
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static VALUE
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step_i(i, iter)
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VALUE i;
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long *iter;
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{
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iter[0]--;
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if (iter[0] == 0) {
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rb_yield(i);
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iter[0] = iter[1];
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}
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return Qnil;
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}
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static void
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range_each_func(range, func, v, e, arg)
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VALUE range;
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VALUE (*func) _((VALUE, void*));
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VALUE v, e;
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void *arg;
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{
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if (EXCL(range)) {
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while (r_lt(v, e)) {
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(*func)(v, arg);
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v = rb_funcall(v, id_succ, 0, 0);
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}
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}
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else {
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while (r_le(v, e)) {
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(*func)(v, arg);
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v = rb_funcall(v, id_succ, 0, 0);
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}
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}
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}
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static VALUE
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range_step(argc, argv, range)
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int argc;
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VALUE *argv;
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VALUE range;
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{
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VALUE b, e, step;
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long unit;
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b = rb_ivar_get(range, id_beg);
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e = rb_ivar_get(range, id_end);
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if (rb_scan_args(argc, argv, "01", &step) == 0) {
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step = INT2FIX(1);
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}
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unit = NUM2LONG(step);
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if (unit < 0) {
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rb_raise(rb_eArgError, "step can't be negative");
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}
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if (FIXNUM_P(b) && FIXNUM_P(e)) { /* fixnums are special */
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long end = FIX2LONG(e);
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long i;
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if (unit == 0) rb_raise(rb_eArgError, "step can't be 0");
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if (!EXCL(range)) end += 1;
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for (i=FIX2LONG(b); i<end; i+=unit) {
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rb_yield(LONG2NUM(i));
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}
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}
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else {
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VALUE tmp = rb_check_string_type(b);
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if (!NIL_P(tmp)) {
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VALUE args[5];
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long iter[2];
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b = tmp;
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if (unit == 0) rb_raise(rb_eArgError, "step can't be 0");
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args[0] = b; args[1] = e; args[2] = range;
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iter[0] = 1; iter[1] = unit;
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rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i, (VALUE)iter);
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}
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else if (rb_obj_is_kind_of(b, rb_cNumeric)) {
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ID c = rb_intern(EXCL(range) ? "<" : "<=");
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if (rb_equal(step, INT2FIX(0))) rb_raise(rb_eArgError, "step can't be 0");
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while (RTEST(rb_funcall(b, c, 1, e))) {
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rb_yield(b);
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b = rb_funcall(b, '+', 1, step);
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}
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}
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else {
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long args[2];
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if (unit == 0) rb_raise(rb_eArgError, "step can't be 0");
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if (!rb_respond_to(b, id_succ)) {
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rb_raise(rb_eTypeError, "cannot iterate from %s",
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rb_obj_classname(b));
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}
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args[0] = 1;
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args[1] = unit;
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range_each_func(range, step_i, b, e, args);
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}
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}
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return range;
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}
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static VALUE
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each_i(v, arg)
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VALUE v;
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void *arg;
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{
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return rb_yield(v);
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}
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static VALUE
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range_each(range)
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VALUE range;
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{
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VALUE beg, end;
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beg = rb_ivar_get(range, id_beg);
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end = rb_ivar_get(range, id_end);
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if (!rb_respond_to(beg, id_succ)) {
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rb_raise(rb_eTypeError, "cannot iterate from %s",
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rb_obj_classname(beg));
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}
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if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
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long lim = FIX2LONG(end);
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long i;
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if (!EXCL(range)) lim += 1;
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for (i=FIX2LONG(beg); i<lim; i++) {
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rb_yield(LONG2NUM(i));
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}
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}
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else if (TYPE(beg) == T_STRING) {
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VALUE args[5];
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long iter[2];
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args[0] = beg; args[1] = end; args[2] = range;
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iter[0] = 1; iter[1] = 1;
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rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i, (VALUE)iter);
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}
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else {
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range_each_func(range, each_i, beg, end, NULL);
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}
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return range;
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}
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static VALUE
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range_first(range)
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VALUE range;
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{
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return rb_ivar_get(range, id_beg);
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}
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static VALUE
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range_last(range)
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VALUE range;
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{
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return rb_ivar_get(range, id_end);
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}
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VALUE
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rb_range_beg_len(range, begp, lenp, len, err)
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VALUE range;
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long *begp, *lenp;
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long len;
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int err;
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{
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long beg, end, b, e;
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if (!rb_obj_is_kind_of(range, rb_cRange)) return Qfalse;
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beg = b = NUM2LONG(rb_ivar_get(range, id_beg));
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end = e = NUM2LONG(rb_ivar_get(range, id_end));
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if (beg < 0) {
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beg += len;
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if (beg < 0) goto out_of_range;
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}
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if (err == 0 || err == 2) {
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if (beg > len) goto out_of_range;
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if (end > len)
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end = len;
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}
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if (end < 0) end += len;
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if (!EXCL(range)) end++; /* include end point */
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if (end < 0) goto out_of_range;
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len = end - beg;
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if (len < 0) goto out_of_range;
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*begp = beg;
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*lenp = len;
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return Qtrue;
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out_of_range:
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if (err) {
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rb_raise(rb_eRangeError, "%ld..%s%ld out of range",
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b, EXCL(range)? "." : "", e);
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}
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return Qnil;
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}
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static VALUE
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range_to_s(range)
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VALUE range;
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{
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VALUE str, str2;
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str = rb_obj_as_string(rb_ivar_get(range, id_beg));
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str2 = rb_obj_as_string(rb_ivar_get(range, id_end));
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str = rb_str_dup(str);
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rb_str_cat(str, "...", EXCL(range)?3:2);
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rb_str_append(str, str2);
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OBJ_INFECT(str, str2);
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return str;
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}
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static VALUE
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range_inspect(range)
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VALUE range;
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{
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VALUE str, str2;
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str = rb_inspect(rb_ivar_get(range, id_beg));
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str2 = rb_inspect(rb_ivar_get(range, id_end));
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str = rb_str_dup(str);
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rb_str_cat(str, "...", EXCL(range)?3:2);
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rb_str_append(str, str2);
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OBJ_INFECT(str, str2);
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return str;
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}
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static void
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member_i(v, args)
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VALUE v;
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VALUE *args;
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{
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if (rb_equal(v, args[0])) {
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args[1] = Qtrue;
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}
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}
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static VALUE
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range_member(range, val)
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VALUE range, val;
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{
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VALUE beg, end;
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VALUE args[2];
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beg = rb_ivar_get(range, id_beg);
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end = rb_ivar_get(range, id_end);
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if (!rb_respond_to(beg, id_succ)) {
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rb_raise(rb_eTypeError, "cannot iterate from %s",
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rb_obj_classname(beg));
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}
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args[0] = val;
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args[1] = Qfalse;
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range_each_func(range, member_i, beg, end, args);
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return args[1];
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}
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static VALUE
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range_include(range, val)
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VALUE range, val;
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{
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VALUE beg, end;
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beg = rb_ivar_get(range, id_beg);
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end = rb_ivar_get(range, id_end);
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if (r_le(beg, val)) {
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if (EXCL(range)) {
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if (r_lt(val, end)) return Qtrue;
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}
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else {
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if (r_le(val, end)) return Qtrue;
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}
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}
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return Qfalse;
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}
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void
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Init_Range()
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{
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rb_cRange = rb_define_class("Range", rb_cObject);
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rb_include_module(rb_cRange, rb_mEnumerable);
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rb_define_method(rb_cRange, "initialize", range_initialize, -1);
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rb_define_method(rb_cRange, "==", range_eq, 1);
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rb_define_method(rb_cRange, "===", range_include, 1);
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rb_define_method(rb_cRange, "eql?", range_eql, 1);
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rb_define_method(rb_cRange, "hash", range_hash, 0);
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rb_define_method(rb_cRange, "each", range_each, 0);
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rb_define_method(rb_cRange, "step", range_step, -1);
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rb_define_method(rb_cRange, "first", range_first, 0);
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rb_define_method(rb_cRange, "last", range_last, 0);
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rb_define_method(rb_cRange, "begin", range_first, 0);
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rb_define_method(rb_cRange, "end", range_last, 0);
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rb_define_method(rb_cRange, "to_s", range_to_s, 0);
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rb_define_method(rb_cRange, "inspect", range_inspect, 0);
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rb_define_method(rb_cRange, "exclude_end?", range_exclude_end_p, 0);
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rb_define_method(rb_cRange, "member?", range_member, 1);
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rb_define_method(rb_cRange, "include?", range_include, 1);
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id_cmp = rb_intern("<=>");
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id_succ = rb_intern("succ");
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id_beg = rb_intern("begin");
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id_end = rb_intern("end");
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id_excl = rb_intern("excl");
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}
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