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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@527 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
319 lines
6.3 KiB
C
319 lines
6.3 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) 1993-1999 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_beg, id_end;
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#define EXCL(r) FL_TEST((r), FL_USER1)
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#define SET_EXCL(r) FL_SET((r), FL_USER1)
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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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rb_funcall(args[0], id_cmp, 1, args[1]);
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return Qnil;
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}
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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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}
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static VALUE
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range_new(klass, beg, end, exclude_end)
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VALUE klass, beg, end;
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int exclude_end;
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{
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VALUE obj;
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VALUE args[2];
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args[0] = beg; 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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obj = rb_obj_alloc(klass);
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if (exclude_end) {
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SET_EXCL(obj);
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}
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rb_ivar_set(obj, id_beg, beg);
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rb_ivar_set(obj, id_end, end);
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return obj;
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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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return range_new(rb_cRange, beg, end, exclude_end);
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}
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static VALUE
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range_s_new(argc, argv, klass)
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int argc;
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VALUE *argv;
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VALUE klass;
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{
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VALUE beg, end, flag;
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rb_scan_args(argc, argv, "21", &beg, &end, &flag);
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return range_new(klass, beg, end, RTEST(flag));
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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_eqq(range, obj)
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VALUE range, obj;
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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 (FIXNUM_P(beg) && FIXNUM_P(obj) && FIXNUM_P(end)) {
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if (NUM2LONG(beg) <= NUM2LONG(obj)) {
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if (EXCL(range)) {
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if (NUM2LONG(obj) < NUM2LONG(end)) return Qtrue;
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}
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else {
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if (NUM2LONG(obj) <= NUM2LONG(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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else if (RTEST(rb_funcall(beg, rb_intern("<="), 1, obj))) {
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if (EXCL(range)) {
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if (RTEST(rb_funcall(end, rb_intern(">"), 1, obj)))
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return Qtrue;
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}
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else {
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if (RTEST(rb_funcall(end, rb_intern(">="), 1, obj)))
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return Qtrue;
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}
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}
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return Qfalse;
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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 b, e;
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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 (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 (!EXCL(range)) end += 1;
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for (i=FIX2LONG(b); i<end; i++) {
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rb_yield(INT2NUM(i));
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}
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}
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else if (TYPE(b) == T_STRING) {
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rb_str_upto(b, e, EXCL(range));
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}
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else { /* generic each */
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VALUE v = b;
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ID succ = rb_intern("succ");
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if (EXCL(range)) {
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while (RTEST(rb_funcall(v, '<', 1, e))) {
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if (rb_equal(v, e)) break;
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rb_yield(v);
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v = rb_funcall(v, succ, 0, 0);
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}
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}
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else {
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ID le = rb_intern("<=");
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while (RTEST(rb_funcall(v, le, 1, e))) {
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rb_yield(v);
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if (rb_equal(v, e)) break;
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v = rb_funcall(v, succ, 0, 0);
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}
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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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range_first(obj)
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VALUE obj;
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{
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VALUE b;
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b = rb_ivar_get(obj, id_beg);
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return b;
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}
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static VALUE
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range_last(obj)
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VALUE obj;
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{
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VALUE e;
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e = rb_ivar_get(obj, id_end);
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return e;
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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 || (!EXCL(range) && end == len))
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end = len;
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}
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if (end < 0) {
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end += len;
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if (end < 0) {
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if (beg == 0 && end == -1 && !EXCL(range)) {
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len = 0;
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goto length_set;
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}
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goto out_of_range;
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}
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}
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len = end - beg;
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if (!EXCL(range)) len++; /* include end point */
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if (len < 0) goto out_of_range;
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length_set:
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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_eIndexError, "%d..%s%d 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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rb_str_cat(str, "...", EXCL(range)?3:2);
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rb_str_cat(str, RSTRING(str2)->ptr, RSTRING(str2)->len);
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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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rb_str_cat(str, "...", EXCL(range)?3:2);
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rb_str_cat(str, RSTRING(str2)->ptr, RSTRING(str2)->len);
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return str;
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}
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static VALUE
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range_length(range)
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VALUE range;
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{
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VALUE beg, end;
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VALUE size;
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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 (RTEST(rb_funcall(beg, '>', 1, end))) {
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return INT2FIX(0);
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}
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if (FIXNUM_P(beg) && FIXNUM_P(end)) {
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if (EXCL(range)) {
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return INT2NUM(NUM2LONG(end) - NUM2LONG(beg));
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}
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else {
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return INT2NUM(NUM2LONG(end) - NUM2LONG(beg) + 1);
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}
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}
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if (!rb_obj_is_kind_of(beg, rb_cNumeric)) {
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return rb_enum_length(range);
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}
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size = rb_funcall(end, '-', 1, beg);
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if (!EXCL(range)) {
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size = rb_funcall(size, '+', 1, INT2FIX(1));
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}
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return size;
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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_singleton_method(rb_cRange, "new", range_s_new, -1);
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rb_define_method(rb_cRange, "===", range_eqq, 1);
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rb_define_method(rb_cRange, "each", range_each, 0);
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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, "length", range_length, 0);
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rb_define_method(rb_cRange, "size", range_length, 0);
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id_cmp = rb_intern("<=>");
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id_beg = rb_intern("begin");
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id_end = rb_intern("end");
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}
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