summaryrefslogtreecommitdiff
path: root/range.c
diff options
context:
space:
mode:
Diffstat (limited to 'range.c')
-rw-r--r--range.c2521
1 files changed, 2103 insertions, 418 deletions
diff --git a/range.c b/range.c
index 3f575de91b..cf9d5fbccf 100644
--- a/range.c
+++ b/range.c
@@ -3,662 +3,2351 @@
range.c -
$Author$
- $Date$
created at: Thu Aug 19 17:46:47 JST 1993
- Copyright (C) 1993-2003 Yukihiro Matsumoto
+ Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
-#include "ruby.h"
+#include "ruby/internal/config.h"
+
+#include <assert.h>
+#include <math.h>
+
+#ifdef HAVE_FLOAT_H
+#include <float.h>
+#endif
+
+#include "id.h"
+#include "internal.h"
+#include "internal/array.h"
+#include "internal/compar.h"
+#include "internal/enum.h"
+#include "internal/enumerator.h"
+#include "internal/error.h"
+#include "internal/numeric.h"
+#include "internal/range.h"
VALUE rb_cRange;
-static ID id_cmp, id_succ, id_beg, id_end, id_excl;
+static ID id_beg, id_end, id_excl;
+#define id_cmp idCmp
+#define id_succ idSucc
+#define id_min idMin
+#define id_max idMax
-#define EXCL(r) RTEST(rb_ivar_get((r), id_excl))
-#define SET_EXCL(r,v) rb_ivar_set((r), id_excl, (v) ? Qtrue : Qfalse)
+static VALUE r_cover_p(VALUE, VALUE, VALUE, VALUE);
-static VALUE
-range_failed()
-{
- rb_raise(rb_eArgError, "bad value for range");
- return Qnil; /* dummy */
-}
+#define RANGE_SET_BEG(r, v) (RSTRUCT_SET(r, 0, v))
+#define RANGE_SET_END(r, v) (RSTRUCT_SET(r, 1, v))
+#define RANGE_SET_EXCL(r, v) (RSTRUCT_SET(r, 2, v))
-static VALUE
-range_check(args)
- VALUE *args;
-{
- return rb_funcall(args[0], id_cmp, 1, args[1]);
-}
+#define EXCL(r) RTEST(RANGE_EXCL(r))
static void
-range_init(range, beg, end, exclude_end)
- VALUE range, beg, end;
- int exclude_end;
+range_init(VALUE range, VALUE beg, VALUE end, VALUE exclude_end)
{
- VALUE args[2];
-
- args[0] = beg;
- args[1] = end;
-
- if (!FIXNUM_P(beg) || !FIXNUM_P(end)) {
+ if ((!FIXNUM_P(beg) || !FIXNUM_P(end)) && !NIL_P(beg) && !NIL_P(end)) {
VALUE v;
- v = rb_rescue(range_check, (VALUE)args, range_failed, 0);
- if (NIL_P(v)) range_failed();
+ v = rb_funcall(beg, id_cmp, 1, end);
+ if (NIL_P(v))
+ rb_raise(rb_eArgError, "bad value for range");
}
- SET_EXCL(range, exclude_end);
- rb_ivar_set(range, id_beg, beg);
- rb_ivar_set(range, id_end, end);
+ RANGE_SET_EXCL(range, exclude_end);
+ RANGE_SET_BEG(range, beg);
+ RANGE_SET_END(range, end);
+
+ if (CLASS_OF(range) == rb_cRange) {
+ rb_obj_freeze(range);
+ }
}
VALUE
-rb_range_new(beg, end, exclude_end)
- VALUE beg, end;
- int exclude_end;
+rb_range_new(VALUE beg, VALUE end, int exclude_end)
{
VALUE range = rb_obj_alloc(rb_cRange);
- range_init(range, beg, end, exclude_end);
+ range_init(range, beg, end, RBOOL(exclude_end));
return range;
}
+static void
+range_modify(VALUE range)
+{
+ rb_check_frozen(range);
+ /* Ranges are immutable, so that they should be initialized only once. */
+ if (RANGE_EXCL(range) != Qnil) {
+ rb_name_err_raise("`initialize' called twice", range, ID2SYM(idInitialize));
+ }
+}
+
/*
* call-seq:
- * Range.new(start, end, exclusive=false) => range
- *
- * Constructs a range using the given <i>start</i> and <i>end</i>. If the third
- * parameter is omitted or is <code>false</code>, the <i>range</i> will include
- * the end object; otherwise, it will be excluded.
+ * Range.new(begin, end, exclude_end = false) -> new_range
+ *
+ * Returns a new range based on the given objects +begin+ and +end+.
+ * Optional argument +exclude_end+ determines whether object +end+
+ * is included as the last object in the range:
+ *
+ * Range.new(2, 5).to_a # => [2, 3, 4, 5]
+ * Range.new(2, 5, true).to_a # => [2, 3, 4]
+ * Range.new('a', 'd').to_a # => ["a", "b", "c", "d"]
+ * Range.new('a', 'd', true).to_a # => ["a", "b", "c"]
+ *
*/
static VALUE
-range_initialize(argc, argv, range)
- int argc;
- VALUE *argv;
- VALUE range;
+range_initialize(int argc, VALUE *argv, VALUE range)
{
VALUE beg, end, flags;
-
+
rb_scan_args(argc, argv, "21", &beg, &end, &flags);
- /* Ranges are immutable, so that they should be initialized only once. */
- if (rb_ivar_defined(range, id_beg)) {
- rb_name_error(rb_intern("initialize"), "`initialize' called twice");
- }
- range_init(range, beg, end, RTEST(flags));
+ range_modify(range);
+ range_init(range, beg, end, RBOOL(RTEST(flags)));
return Qnil;
}
+/* :nodoc: */
+static VALUE
+range_initialize_copy(VALUE range, VALUE orig)
+{
+ range_modify(range);
+ rb_struct_init_copy(range, orig);
+ return range;
+}
/*
* call-seq:
- * rng.exclude_end? => true or false
- *
- * Returns <code>true</code> if <i>rng</i> excludes its end value.
+ * exclude_end? -> true or false
+ *
+ * Returns +true+ if +self+ excludes its end value; +false+ otherwise:
+ *
+ * Range.new(2, 5).exclude_end? # => false
+ * Range.new(2, 5, true).exclude_end? # => true
+ * (2..5).exclude_end? # => false
+ * (2...5).exclude_end? # => true
*/
static VALUE
-range_exclude_end_p(range)
- VALUE range;
+range_exclude_end_p(VALUE range)
+{
+ return RBOOL(EXCL(range));
+}
+
+static VALUE
+recursive_equal(VALUE range, VALUE obj, int recur)
{
- return EXCL(range) ? Qtrue : Qfalse;
+ if (recur) return Qtrue; /* Subtle! */
+ if (!rb_equal(RANGE_BEG(range), RANGE_BEG(obj)))
+ return Qfalse;
+ if (!rb_equal(RANGE_END(range), RANGE_END(obj)))
+ return Qfalse;
+
+ return RBOOL(EXCL(range) == EXCL(obj));
}
/*
* call-seq:
- * rng == obj => true or false
- *
- * Returns <code>true</code> only if <i>obj</i> is a Range, has equivalent
- * beginning and end items (by comparing them with <code>==</code>), and has
- * the same #exclude_end? setting as <i>rng</t>.
- *
- * (0..2) == (0..2) #=> true
- * (0..2) == Range.new(0,2) #=> true
- * (0..2) == (0...2) #=> false
- *
+ * self == other -> true or false
+ *
+ * Returns +true+ if and only if:
+ *
+ * - +other+ is a range.
+ * - <tt>other.begin == self.begin</tt>.
+ * - <tt>other.end == self.end</tt>.
+ * - <tt>other.exclude_end? == self.exclude_end?</tt>.
+ *
+ * Otherwise returns +false+.
+ *
+ * r = (1..5)
+ * r == (1..5) # => true
+ * r = Range.new(1, 5)
+ * r == 'foo' # => false
+ * r == (2..5) # => false
+ * r == (1..4) # => false
+ * r == (1...5) # => false
+ * r == Range.new(1, 5, true) # => false
+ *
+ * Note that even with the same argument, the return values of #== and #eql? can differ:
+ *
+ * (1..2) == (1..2.0) # => true
+ * (1..2).eql? (1..2.0) # => false
+ *
+ * Related: Range#eql?.
+ *
*/
static VALUE
-range_eq(range, obj)
- VALUE range, obj;
+range_eq(VALUE range, VALUE obj)
{
- if (range == obj) return Qtrue;
- if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
- return Qfalse;
-
- if (!rb_equal(rb_ivar_get(range, id_beg), rb_ivar_get(obj, id_beg)))
+ if (range == obj)
+ return Qtrue;
+ if (!rb_obj_is_kind_of(obj, rb_cRange))
return Qfalse;
- if (!rb_equal(rb_ivar_get(range, id_end), rb_ivar_get(obj, id_end)))
- return Qfalse;
-
- if (EXCL(range) != EXCL(obj)) return Qfalse;
- return Qtrue;
+ return rb_exec_recursive_paired(recursive_equal, range, obj, obj);
}
+/* compares _a_ and _b_ and returns:
+ * < 0: a < b
+ * = 0: a = b
+ * > 0: a > b or non-comparable
+ */
static int
-r_lt(a, b)
- VALUE a, b;
+r_less(VALUE a, VALUE b)
{
VALUE r = rb_funcall(a, id_cmp, 1, b);
- if (NIL_P(r)) return Qfalse;
- if (rb_cmpint(r, a, b) < 0) return Qtrue;
- return Qfalse;
+ if (NIL_P(r))
+ return INT_MAX;
+ return rb_cmpint(r, a, b);
}
-static int
-r_le(a, b)
- VALUE a, b;
+static VALUE
+recursive_eql(VALUE range, VALUE obj, int recur)
{
- int c;
- VALUE r = rb_funcall(a, id_cmp, 1, b);
+ if (recur) return Qtrue; /* Subtle! */
+ if (!rb_eql(RANGE_BEG(range), RANGE_BEG(obj)))
+ return Qfalse;
+ if (!rb_eql(RANGE_END(range), RANGE_END(obj)))
+ return Qfalse;
- if (NIL_P(r)) return Qfalse;
- c = rb_cmpint(r, a, b);
- if (c == 0) return INT2FIX(0);
- if (c < 0) return Qtrue;
- return Qfalse;
+ return RBOOL(EXCL(range) == EXCL(obj));
}
-
/*
* call-seq:
- * rng.eql?(obj) => true or false
- *
- * Returns <code>true</code> only if <i>obj</i> is a Range, has equivalent
- * beginning and end items (by comparing them with #eql?), and has the same
- * #exclude_end? setting as <i>rng</i>.
- *
- * (0..2) == (0..2) #=> true
- * (0..2) == Range.new(0,2) #=> true
- * (0..2) == (0...2) #=> false
- *
+ * eql?(other) -> true or false
+ *
+ * Returns +true+ if and only if:
+ *
+ * - +other+ is a range.
+ * - <tt>other.begin eql? self.begin</tt>.
+ * - <tt>other.end eql? self.end</tt>.
+ * - <tt>other.exclude_end? == self.exclude_end?</tt>.
+ *
+ * Otherwise returns +false+.
+ *
+ * r = (1..5)
+ * r.eql?(1..5) # => true
+ * r = Range.new(1, 5)
+ * r.eql?('foo') # => false
+ * r.eql?(2..5) # => false
+ * r.eql?(1..4) # => false
+ * r.eql?(1...5) # => false
+ * r.eql?(Range.new(1, 5, true)) # => false
+ *
+ * Note that even with the same argument, the return values of #== and #eql? can differ:
+ *
+ * (1..2) == (1..2.0) # => true
+ * (1..2).eql? (1..2.0) # => false
+ *
+ * Related: Range#==.
*/
static VALUE
-range_eql(range, obj)
- VALUE range, obj;
+range_eql(VALUE range, VALUE obj)
{
- if (range == obj) return Qtrue;
- if (!rb_obj_is_instance_of(obj, rb_obj_class(range)))
+ if (range == obj)
+ return Qtrue;
+ if (!rb_obj_is_kind_of(obj, rb_cRange))
return Qfalse;
-
- if (!rb_eql(rb_ivar_get(range, id_beg), rb_ivar_get(obj, id_beg)))
- return Qfalse;
- if (!rb_eql(rb_ivar_get(range, id_end), rb_ivar_get(obj, id_end)))
- return Qfalse;
-
- if (EXCL(range) != EXCL(obj)) return Qfalse;
-
- return Qtrue;
+ return rb_exec_recursive_paired(recursive_eql, range, obj, obj);
}
/*
* call-seq:
- * rng.hash => fixnum
+ * hash -> integer
*
- * Generate a hash value such that two ranges with the same start and
- * end points, and the same value for the "exclude end" flag, generate
- * the same hash value.
+ * Returns the integer hash value for +self+.
+ * Two range objects +r0+ and +r1+ have the same hash value
+ * if and only if <tt>r0.eql?(r1)</tt>.
+ *
+ * Related: Range#eql?, Object#hash.
*/
static VALUE
-range_hash(range)
- VALUE range;
+range_hash(VALUE range)
{
- long hash = EXCL(range);
+ st_index_t hash = EXCL(range);
VALUE v;
- v = rb_hash(rb_ivar_get(range, id_beg));
- hash ^= v << 1;
- v = rb_hash(rb_ivar_get(range, id_end));
- hash ^= v << 9;
- hash ^= EXCL(range) << 24;
-
- return LONG2FIX(hash);
-}
+ hash = rb_hash_start(hash);
+ v = rb_hash(RANGE_BEG(range));
+ hash = rb_hash_uint(hash, NUM2LONG(v));
+ v = rb_hash(RANGE_END(range));
+ hash = rb_hash_uint(hash, NUM2LONG(v));
+ hash = rb_hash_uint(hash, EXCL(range) << 24);
+ hash = rb_hash_end(hash);
-static VALUE
-str_step(args)
- VALUE *args;
-{
- return rb_str_upto(args[0], args[1], EXCL(args[2]));
+ return ST2FIX(hash);
}
static void
-range_each_func(range, func, v, e, arg)
- VALUE range;
- void (*func) _((VALUE, void*));
- VALUE v, e;
- void *arg;
+range_each_func(VALUE range, int (*func)(VALUE, VALUE), VALUE arg)
{
int c;
+ VALUE b = RANGE_BEG(range);
+ VALUE e = RANGE_END(range);
+ VALUE v = b;
if (EXCL(range)) {
- while (r_lt(v, e)) {
- (*func)(v, arg);
- v = rb_funcall(v, id_succ, 0, 0);
+ while (r_less(v, e) < 0) {
+ if ((*func)(v, arg)) break;
+ v = rb_funcallv(v, id_succ, 0, 0);
}
}
else {
- while (RTEST(c = r_le(v, e))) {
- (*func)(v, arg);
- if (c == INT2FIX(0)) break;
- v = rb_funcall(v, id_succ, 0, 0);
+ while ((c = r_less(v, e)) <= 0) {
+ if ((*func)(v, arg)) break;
+ if (!c) break;
+ v = rb_funcallv(v, id_succ, 0, 0);
}
}
}
-static VALUE
-step_i(i, iter)
- VALUE i;
- long *iter;
+static bool
+step_i_iter(VALUE arg)
{
- iter[0]--;
- if (iter[0] == 0) {
+ VALUE *iter = (VALUE *)arg;
+
+ if (FIXNUM_P(iter[0])) {
+ iter[0] -= INT2FIX(1) & ~FIXNUM_FLAG;
+ }
+ else {
+ iter[0] = rb_funcall(iter[0], '-', 1, INT2FIX(1));
+ }
+ if (iter[0] != INT2FIX(0)) return false;
+ iter[0] = iter[1];
+ return true;
+}
+
+static int
+sym_step_i(VALUE i, VALUE arg)
+{
+ if (step_i_iter(arg)) {
+ rb_yield(rb_str_intern(i));
+ }
+ return 0;
+}
+
+static int
+step_i(VALUE i, VALUE arg)
+{
+ if (step_i_iter(arg)) {
rb_yield(i);
- iter[0] = iter[1];
+ }
+ return 0;
+}
+
+static int
+discrete_object_p(VALUE obj)
+{
+ return rb_respond_to(obj, id_succ);
+}
+
+static int
+linear_object_p(VALUE obj)
+{
+ if (FIXNUM_P(obj) || FLONUM_P(obj)) return TRUE;
+ if (SPECIAL_CONST_P(obj)) return FALSE;
+ switch (BUILTIN_TYPE(obj)) {
+ case T_FLOAT:
+ case T_BIGNUM:
+ return TRUE;
+ default:
+ break;
+ }
+ if (rb_obj_is_kind_of(obj, rb_cNumeric)) return TRUE;
+ if (rb_obj_is_kind_of(obj, rb_cTime)) return TRUE;
+ return FALSE;
+}
+
+static VALUE
+check_step_domain(VALUE step)
+{
+ VALUE zero = INT2FIX(0);
+ int cmp;
+ if (!rb_obj_is_kind_of(step, rb_cNumeric)) {
+ step = rb_to_int(step);
+ }
+ cmp = rb_cmpint(rb_funcallv(step, idCmp, 1, &zero), step, zero);
+ if (cmp < 0) {
+ rb_raise(rb_eArgError, "step can't be negative");
+ }
+ else if (cmp == 0) {
+ rb_raise(rb_eArgError, "step can't be 0");
+ }
+ return step;
+}
+
+static VALUE
+range_step_size(VALUE range, VALUE args, VALUE eobj)
+{
+ VALUE b = RANGE_BEG(range), e = RANGE_END(range);
+ VALUE step = INT2FIX(1);
+ if (args) {
+ step = check_step_domain(RARRAY_AREF(args, 0));
+ }
+
+ if (rb_obj_is_kind_of(b, rb_cNumeric) && rb_obj_is_kind_of(e, rb_cNumeric)) {
+ return ruby_num_interval_step_size(b, e, step, EXCL(range));
}
return Qnil;
}
/*
* call-seq:
- * rng.step(n=1) {| obj | block } => rng
- *
- * Iterates over <i>rng</i>, passing each <i>n</i>th element to the block. If
- * the range contains numbers or strings, natural ordering is used. Otherwise
- * <code>step</code> invokes <code>succ</code> to iterate through range
- * elements. The following code uses class <code>Xs</code>, which is defined
- * in the class-level documentation.
- *
- * range = Xs.new(1)..Xs.new(10)
- * range.step(2) {|x| puts x}
- * range.step(3) {|x| puts x}
- *
- * <em>produces:</em>
- *
- * 1 x
- * 3 xxx
- * 5 xxxxx
- * 7 xxxxxxx
- * 9 xxxxxxxxx
- * 1 x
- * 4 xxxx
- * 7 xxxxxxx
- * 10 xxxxxxxxxx
+ * step(n = 1) {|element| ... } -> self
+ * step(n = 1) -> enumerator
+ *
+ * Iterates over the elements of +self+.
+ *
+ * With a block given and no argument,
+ * calls the block each element of the range; returns +self+:
+ *
+ * a = []
+ * (1..5).step {|element| a.push(element) } # => 1..5
+ * a # => [1, 2, 3, 4, 5]
+ * a = []
+ * ('a'..'e').step {|element| a.push(element) } # => "a".."e"
+ * a # => ["a", "b", "c", "d", "e"]
+ *
+ * With a block given and a positive integer argument +n+ given,
+ * calls the block with element +0+, element +n+, element <tt>2n</tt>, and so on:
+ *
+ * a = []
+ * (1..5).step(2) {|element| a.push(element) } # => 1..5
+ * a # => [1, 3, 5]
+ * a = []
+ * ('a'..'e').step(2) {|element| a.push(element) } # => "a".."e"
+ * a # => ["a", "c", "e"]
+ *
+ * With no block given, returns an enumerator,
+ * which will be of class Enumerator::ArithmeticSequence if +self+ is numeric;
+ * otherwise of class Enumerator:
+ *
+ * e = (1..5).step(2) # => ((1..5).step(2))
+ * e.class # => Enumerator::ArithmeticSequence
+ * ('a'..'e').step # => #<Enumerator: ...>
+ *
+ * Related: Range#%.
*/
-
-
static VALUE
-range_step(argc, argv, range)
- int argc;
- VALUE *argv;
- VALUE range;
+range_step(int argc, VALUE *argv, VALUE range)
{
- VALUE b, e, step;
- long unit;
-
- b = rb_ivar_get(range, id_beg);
- e = rb_ivar_get(range, id_end);
- if (rb_scan_args(argc, argv, "01", &step) == 0) {
- step = INT2FIX(1);
+ VALUE b, e, step, tmp;
+
+ b = RANGE_BEG(range);
+ e = RANGE_END(range);
+ step = (!rb_check_arity(argc, 0, 1) ? INT2FIX(1) : argv[0]);
+
+ if (!rb_block_given_p()) {
+ if (!rb_obj_is_kind_of(step, rb_cNumeric)) {
+ step = rb_to_int(step);
+ }
+ if (rb_equal(step, INT2FIX(0))) {
+ rb_raise(rb_eArgError, "step can't be 0");
+ }
+
+ const VALUE b_num_p = rb_obj_is_kind_of(b, rb_cNumeric);
+ const VALUE e_num_p = rb_obj_is_kind_of(e, rb_cNumeric);
+ if ((b_num_p && (NIL_P(e) || e_num_p)) || (NIL_P(b) && e_num_p)) {
+ return rb_arith_seq_new(range, ID2SYM(rb_frame_this_func()), argc, argv,
+ range_step_size, b, e, step, EXCL(range));
+ }
+
+ RETURN_SIZED_ENUMERATOR(range, argc, argv, range_step_size);
}
- unit = NUM2LONG(step);
- if (unit < 0) {
- rb_raise(rb_eArgError, "step can't be negative");
- }
- if (FIXNUM_P(b) && FIXNUM_P(e)) { /* fixnums are special */
+ step = check_step_domain(step);
+ VALUE iter[2] = {INT2FIX(1), step};
+
+ if (FIXNUM_P(b) && NIL_P(e) && FIXNUM_P(step)) {
+ long i = FIX2LONG(b), unit = FIX2LONG(step);
+ do {
+ rb_yield(LONG2FIX(i));
+ i += unit; /* FIXABLE+FIXABLE never overflow */
+ } while (FIXABLE(i));
+ b = LONG2NUM(i);
+
+ for (;; b = rb_big_plus(b, step))
+ rb_yield(b);
+ }
+ else if (FIXNUM_P(b) && FIXNUM_P(e) && FIXNUM_P(step)) { /* fixnums are special */
long end = FIX2LONG(e);
- long i;
+ long i, unit = FIX2LONG(step);
- if (unit == 0) rb_raise(rb_eArgError, "step can't be 0");
- if (!EXCL(range)) end += 1;
- for (i=FIX2LONG(b); i<end; i+=unit) {
+ if (!EXCL(range))
+ end += 1;
+ i = FIX2LONG(b);
+ while (i < end) {
rb_yield(LONG2NUM(i));
+ if (i + unit < i) break;
+ i += unit;
+ }
+
+ }
+ else if (SYMBOL_P(b) && (NIL_P(e) || SYMBOL_P(e))) { /* symbols are special */
+ b = rb_sym2str(b);
+ if (NIL_P(e)) {
+ rb_str_upto_endless_each(b, sym_step_i, (VALUE)iter);
+ }
+ else {
+ rb_str_upto_each(b, rb_sym2str(e), EXCL(range), sym_step_i, (VALUE)iter);
+ }
+ }
+ else if (ruby_float_step(b, e, step, EXCL(range), TRUE)) {
+ /* done */
+ }
+ else if (rb_obj_is_kind_of(b, rb_cNumeric) ||
+ !NIL_P(rb_check_to_integer(b, "to_int")) ||
+ !NIL_P(rb_check_to_integer(e, "to_int"))) {
+ ID op = EXCL(range) ? '<' : idLE;
+ VALUE v = b;
+ int i = 0;
+
+ while (NIL_P(e) || RTEST(rb_funcall(v, op, 1, e))) {
+ rb_yield(v);
+ i++;
+ v = rb_funcall(b, '+', 1, rb_funcall(INT2NUM(i), '*', 1, step));
}
}
else {
- VALUE tmp = rb_check_string_type(b);
+ tmp = rb_check_string_type(b);
if (!NIL_P(tmp)) {
- VALUE args[5];
- long iter[2];
-
b = tmp;
- if (unit == 0) rb_raise(rb_eArgError, "step can't be 0");
- args[0] = b; args[1] = e; args[2] = range;
- iter[0] = 1; iter[1] = unit;
- rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i,
- (VALUE)iter);
- }
- else if (rb_obj_is_kind_of(b, rb_cNumeric)) {
- ID c = rb_intern(EXCL(range) ? "<" : "<=");
-
- if (rb_equal(step, INT2FIX(0))) rb_raise(rb_eArgError, "step can't be 0");
- while (RTEST(rb_funcall(b, c, 1, e))) {
- rb_yield(b);
- b = rb_funcall(b, '+', 1, step);
+ if (NIL_P(e)) {
+ rb_str_upto_endless_each(b, step_i, (VALUE)iter);
+ }
+ else {
+ rb_str_upto_each(b, e, EXCL(range), step_i, (VALUE)iter);
}
}
else {
- long args[2];
-
- if (unit == 0) rb_raise(rb_eArgError, "step can't be 0");
- if (!rb_respond_to(b, id_succ)) {
+ if (!discrete_object_p(b)) {
rb_raise(rb_eTypeError, "can't iterate from %s",
rb_obj_classname(b));
}
-
- args[0] = 1;
- args[1] = unit;
- range_each_func(range, step_i, b, e, args);
+ range_each_func(range, step_i, (VALUE)iter);
}
}
return range;
}
-static void
-each_i(v, arg)
- VALUE v;
- void *arg;
+/*
+ * call-seq:
+ * %(n) {|element| ... } -> self
+ * %(n) -> enumerator
+ *
+ * Iterates over the elements of +self+.
+ *
+ * With a block given, calls the block with selected elements of the range;
+ * returns +self+:
+ *
+ * a = []
+ * (1..5).%(2) {|element| a.push(element) } # => 1..5
+ * a # => [1, 3, 5]
+ * a = []
+ * ('a'..'e').%(2) {|element| a.push(element) } # => "a".."e"
+ * a # => ["a", "c", "e"]
+ *
+ * With no block given, returns an enumerator,
+ * which will be of class Enumerator::ArithmeticSequence if +self+ is numeric;
+ * otherwise of class Enumerator:
+ *
+ * e = (1..5) % 2 # => ((1..5).%(2))
+ * e.class # => Enumerator::ArithmeticSequence
+ * ('a'..'e') % 2 # => #<Enumerator: ...>
+ *
+ * Related: Range#step.
+ */
+static VALUE
+range_percent_step(VALUE range, VALUE step)
+{
+ return range_step(1, &step, range);
+}
+
+#if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
+union int64_double {
+ int64_t i;
+ double d;
+};
+
+static VALUE
+int64_as_double_to_num(int64_t i)
+{
+ union int64_double convert;
+ if (i < 0) {
+ convert.i = -i;
+ return DBL2NUM(-convert.d);
+ }
+ else {
+ convert.i = i;
+ return DBL2NUM(convert.d);
+ }
+}
+
+static int64_t
+double_as_int64(double d)
+{
+ union int64_double convert;
+ convert.d = fabs(d);
+ return d < 0 ? -convert.i : convert.i;
+}
+#endif
+
+static int
+is_integer_p(VALUE v)
+{
+ ID id_integer_p;
+ VALUE is_int;
+ CONST_ID(id_integer_p, "integer?");
+ is_int = rb_check_funcall(v, id_integer_p, 0, 0);
+ return RTEST(is_int) && is_int != Qundef;
+}
+
+static VALUE
+bsearch_integer_range(VALUE beg, VALUE end, int excl)
+{
+ VALUE satisfied = Qnil;
+ int smaller;
+
+#define BSEARCH_CHECK(expr) \
+ do { \
+ VALUE val = (expr); \
+ VALUE v = rb_yield(val); \
+ if (FIXNUM_P(v)) { \
+ if (v == INT2FIX(0)) return val; \
+ smaller = (SIGNED_VALUE)v < 0; \
+ } \
+ else if (v == Qtrue) { \
+ satisfied = val; \
+ smaller = 1; \
+ } \
+ else if (!RTEST(v)) { \
+ smaller = 0; \
+ } \
+ else if (rb_obj_is_kind_of(v, rb_cNumeric)) { \
+ int cmp = rb_cmpint(rb_funcall(v, id_cmp, 1, INT2FIX(0)), v, INT2FIX(0)); \
+ if (!cmp) return val; \
+ smaller = cmp < 0; \
+ } \
+ else { \
+ rb_raise(rb_eTypeError, "wrong argument type %"PRIsVALUE \
+ " (must be numeric, true, false or nil)", \
+ rb_obj_class(v)); \
+ } \
+ } while (0)
+
+ VALUE low = rb_to_int(beg);
+ VALUE high = rb_to_int(end);
+ VALUE mid, org_high;
+ ID id_div;
+ CONST_ID(id_div, "div");
+
+ if (excl) high = rb_funcall(high, '-', 1, INT2FIX(1));
+ org_high = high;
+
+ while (rb_cmpint(rb_funcall(low, id_cmp, 1, high), low, high) < 0) {
+ mid = rb_funcall(rb_funcall(high, '+', 1, low), id_div, 1, INT2FIX(2));
+ BSEARCH_CHECK(mid);
+ if (smaller) {
+ high = mid;
+ }
+ else {
+ low = rb_funcall(mid, '+', 1, INT2FIX(1));
+ }
+ }
+ if (rb_equal(low, org_high)) {
+ BSEARCH_CHECK(low);
+ if (!smaller) return Qnil;
+ }
+ return satisfied;
+}
+
+/*
+ * call-seq:
+ * bsearch {|obj| block } -> value
+ *
+ * Returns an element from +self+ selected by a binary search.
+ *
+ * See {Binary Searching}[rdoc-ref:bsearch.rdoc].
+ *
+ */
+
+static VALUE
+range_bsearch(VALUE range)
+{
+ VALUE beg, end, satisfied = Qnil;
+ int smaller;
+
+ /* Implementation notes:
+ * Floats are handled by mapping them to 64 bits integers.
+ * Apart from sign issues, floats and their 64 bits integer have the
+ * same order, assuming they are represented as exponent followed
+ * by the mantissa. This is true with or without implicit bit.
+ *
+ * Finding the average of two ints needs to be careful about
+ * potential overflow (since float to long can use 64 bits)
+ * as well as the fact that -1/2 can be 0 or -1 in C89.
+ *
+ * Note that -0.0 is mapped to the same int as 0.0 as we don't want
+ * (-1...0.0).bsearch to yield -0.0.
+ */
+
+#define BSEARCH(conv) \
+ do { \
+ RETURN_ENUMERATOR(range, 0, 0); \
+ if (EXCL(range)) high--; \
+ org_high = high; \
+ while (low < high) { \
+ mid = ((high < 0) == (low < 0)) ? low + ((high - low) / 2) \
+ : (low < -high) ? -((-1 - low - high)/2 + 1) : (low + high) / 2; \
+ BSEARCH_CHECK(conv(mid)); \
+ if (smaller) { \
+ high = mid; \
+ } \
+ else { \
+ low = mid + 1; \
+ } \
+ } \
+ if (low == org_high) { \
+ BSEARCH_CHECK(conv(low)); \
+ if (!smaller) return Qnil; \
+ } \
+ return satisfied; \
+ } while (0)
+
+
+ beg = RANGE_BEG(range);
+ end = RANGE_END(range);
+
+ if (FIXNUM_P(beg) && FIXNUM_P(end)) {
+ long low = FIX2LONG(beg);
+ long high = FIX2LONG(end);
+ long mid, org_high;
+ BSEARCH(INT2FIX);
+ }
+#if SIZEOF_DOUBLE == 8 && defined(HAVE_INT64_T)
+ else if (RB_FLOAT_TYPE_P(beg) || RB_FLOAT_TYPE_P(end)) {
+ int64_t low = double_as_int64(NIL_P(beg) ? -HUGE_VAL : RFLOAT_VALUE(rb_Float(beg)));
+ int64_t high = double_as_int64(NIL_P(end) ? HUGE_VAL : RFLOAT_VALUE(rb_Float(end)));
+ int64_t mid, org_high;
+ BSEARCH(int64_as_double_to_num);
+ }
+#endif
+ else if (is_integer_p(beg) && is_integer_p(end)) {
+ RETURN_ENUMERATOR(range, 0, 0);
+ return bsearch_integer_range(beg, end, EXCL(range));
+ }
+ else if (is_integer_p(beg) && NIL_P(end)) {
+ VALUE diff = LONG2FIX(1);
+ RETURN_ENUMERATOR(range, 0, 0);
+ while (1) {
+ VALUE mid = rb_funcall(beg, '+', 1, diff);
+ BSEARCH_CHECK(mid);
+ if (smaller) {
+ return bsearch_integer_range(beg, mid, 0);
+ }
+ diff = rb_funcall(diff, '*', 1, LONG2FIX(2));
+ }
+ }
+ else if (NIL_P(beg) && is_integer_p(end)) {
+ VALUE diff = LONG2FIX(-1);
+ RETURN_ENUMERATOR(range, 0, 0);
+ while (1) {
+ VALUE mid = rb_funcall(end, '+', 1, diff);
+ BSEARCH_CHECK(mid);
+ if (!smaller) {
+ return bsearch_integer_range(mid, end, 0);
+ }
+ diff = rb_funcall(diff, '*', 1, LONG2FIX(2));
+ }
+ }
+ else {
+ rb_raise(rb_eTypeError, "can't do binary search for %s", rb_obj_classname(beg));
+ }
+ return range;
+}
+
+static int
+each_i(VALUE v, VALUE arg)
{
rb_yield(v);
+ return 0;
+}
+
+static int
+sym_each_i(VALUE v, VALUE arg)
+{
+ return each_i(rb_str_intern(v), arg);
}
/*
* call-seq:
- * rng.each {| i | block } => rng
- *
- * Iterates over the elements <i>rng</i>, passing each in turn to the
- * block. You can only iterate if the start object of the range
- * supports the +succ+ method (which means that you can't iterate over
- * ranges of +Float+ objects).
- *
- * (10..15).each do |n|
- * print n, ' '
- * end
- *
- * <em>produces:</em>
- *
- * 10 11 12 13 14 15
+ * size -> non_negative_integer or Infinity or nil
+ *
+ * Returns the count of elements in +self+
+ * if both begin and end values are numeric;
+ * otherwise, returns +nil+:
+ *
+ * (1..4).size # => 4
+ * (1...4).size # => 3
+ * (1..).size # => Infinity
+ * ('a'..'z').size #=> nil
+ *
+ * Related: Range#count.
+ */
+
+static VALUE
+range_size(VALUE range)
+{
+ VALUE b = RANGE_BEG(range), e = RANGE_END(range);
+ if (rb_obj_is_kind_of(b, rb_cNumeric)) {
+ if (rb_obj_is_kind_of(e, rb_cNumeric)) {
+ return ruby_num_interval_step_size(b, e, INT2FIX(1), EXCL(range));
+ }
+ if (NIL_P(e)) {
+ return DBL2NUM(HUGE_VAL);
+ }
+ }
+ else if (NIL_P(b)) {
+ return DBL2NUM(HUGE_VAL);
+ }
+
+ return Qnil;
+}
+
+/*
+ * call-seq:
+ * to_a -> array
+ *
+ * Returns an array containing the elements in +self+, if a finite collection;
+ * raises an exception otherwise.
+ *
+ * (1..4).to_a # => [1, 2, 3, 4]
+ * (1...4).to_a # => [1, 2, 3]
+ * ('a'..'d').to_a # => ["a", "b", "c", "d"]
+ *
+ * Range#entries is an alias for Range#to_a.
*/
static VALUE
-range_each(range)
- VALUE range;
+range_to_a(VALUE range)
+{
+ if (NIL_P(RANGE_END(range))) {
+ rb_raise(rb_eRangeError, "cannot convert endless range to an array");
+ }
+ return rb_call_super(0, 0);
+}
+
+static VALUE
+range_enum_size(VALUE range, VALUE args, VALUE eobj)
+{
+ return range_size(range);
+}
+
+RBIMPL_ATTR_NORETURN()
+static void
+range_each_bignum_endless(VALUE beg)
+{
+ for (;; beg = rb_big_plus(beg, INT2FIX(1))) {
+ rb_yield(beg);
+ }
+ UNREACHABLE;
+}
+
+RBIMPL_ATTR_NORETURN()
+static void
+range_each_fixnum_endless(VALUE beg)
+{
+ for (long i = FIX2LONG(beg); FIXABLE(i); i++) {
+ rb_yield(LONG2FIX(i));
+ }
+
+ range_each_bignum_endless(LONG2NUM(RUBY_FIXNUM_MAX + 1));
+ UNREACHABLE;
+}
+
+static VALUE
+range_each_fixnum_loop(VALUE beg, VALUE end, VALUE range)
+{
+ long lim = FIX2LONG(end) + !EXCL(range);
+ for (long i = FIX2LONG(beg); i < lim; i++) {
+ rb_yield(LONG2FIX(i));
+ }
+ return range;
+}
+
+/*
+ * call-seq:
+ * each {|element| ... } -> self
+ * each -> an_enumerator
+ *
+ * With a block given, passes each element of +self+ to the block:
+ *
+ * a = []
+ * (1..4).each {|element| a.push(element) } # => 1..4
+ * a # => [1, 2, 3, 4]
+ *
+ * Raises an exception unless <tt>self.first.respond_to?(:succ)</tt>.
+ *
+ * With no block given, returns an enumerator.
+ *
+ */
+
+static VALUE
+range_each(VALUE range)
{
VALUE beg, end;
+ long i;
+
+ RETURN_SIZED_ENUMERATOR(range, 0, 0, range_enum_size);
- beg = rb_ivar_get(range, id_beg);
- end = rb_ivar_get(range, id_end);
+ beg = RANGE_BEG(range);
+ end = RANGE_END(range);
- if (!rb_respond_to(beg, id_succ)) {
- rb_raise(rb_eTypeError, "can't iterate from %s",
- rb_obj_classname(beg));
+ if (FIXNUM_P(beg) && NIL_P(end)) {
+ range_each_fixnum_endless(beg);
}
- if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
- long lim = FIX2LONG(end);
- long i;
+ else if (FIXNUM_P(beg) && FIXNUM_P(end)) { /* fixnums are special */
+ return range_each_fixnum_loop(beg, end, range);
+ }
+ else if (RB_INTEGER_TYPE_P(beg) && (NIL_P(end) || RB_INTEGER_TYPE_P(end))) {
+ if (SPECIAL_CONST_P(end) || RBIGNUM_POSITIVE_P(end)) { /* end >= FIXNUM_MIN */
+ if (!FIXNUM_P(beg)) {
+ if (RBIGNUM_NEGATIVE_P(beg)) {
+ do {
+ rb_yield(beg);
+ } while (!FIXNUM_P(beg = rb_big_plus(beg, INT2FIX(1))));
+ if (NIL_P(end)) range_each_fixnum_endless(beg);
+ if (FIXNUM_P(end)) return range_each_fixnum_loop(beg, end, range);
+ }
+ else {
+ if (NIL_P(end)) range_each_bignum_endless(beg);
+ if (FIXNUM_P(end)) return range;
+ }
+ }
+ if (FIXNUM_P(beg)) {
+ i = FIX2LONG(beg);
+ do {
+ rb_yield(LONG2FIX(i));
+ } while (POSFIXABLE(++i));
+ beg = LONG2NUM(i);
+ }
+ ASSUME(!FIXNUM_P(beg));
+ ASSUME(!SPECIAL_CONST_P(end));
+ }
+ if (!FIXNUM_P(beg) && RBIGNUM_SIGN(beg) == RBIGNUM_SIGN(end)) {
+ if (EXCL(range)) {
+ while (rb_big_cmp(beg, end) == INT2FIX(-1)) {
+ rb_yield(beg);
+ beg = rb_big_plus(beg, INT2FIX(1));
+ }
+ }
+ else {
+ VALUE c;
+ while ((c = rb_big_cmp(beg, end)) != INT2FIX(1)) {
+ rb_yield(beg);
+ if (c == INT2FIX(0)) break;
+ beg = rb_big_plus(beg, INT2FIX(1));
+ }
+ }
+ }
+ }
+ else if (SYMBOL_P(beg) && (NIL_P(end) || SYMBOL_P(end))) { /* symbols are special */
+ beg = rb_sym2str(beg);
+ if (NIL_P(end)) {
+ rb_str_upto_endless_each(beg, sym_each_i, 0);
+ }
+ else {
+ rb_str_upto_each(beg, rb_sym2str(end), EXCL(range), sym_each_i, 0);
+ }
+ }
+ else {
+ VALUE tmp = rb_check_string_type(beg);
- if (!EXCL(range)) lim += 1;
- for (i=FIX2LONG(beg); i<lim; i++) {
- rb_yield(LONG2NUM(i));
+ if (!NIL_P(tmp)) {
+ if (!NIL_P(end)) {
+ rb_str_upto_each(tmp, end, EXCL(range), each_i, 0);
+ }
+ else {
+ rb_str_upto_endless_each(tmp, each_i, 0);
+ }
+ }
+ else {
+ if (!discrete_object_p(beg)) {
+ rb_raise(rb_eTypeError, "can't iterate from %s",
+ rb_obj_classname(beg));
+ }
+ if (!NIL_P(end))
+ range_each_func(range, each_i, 0);
+ else
+ for (;; beg = rb_funcallv(beg, id_succ, 0, 0))
+ rb_yield(beg);
}
}
- else if (TYPE(beg) == T_STRING) {
- VALUE args[5];
- long iter[2];
+ return range;
+}
+
+/*
+ * call-seq:
+ * self.begin -> object
+ *
+ * Returns the object that defines the beginning of +self+.
+ *
+ * (1..4).begin # => 1
+ * (..2).begin # => nil
+ *
+ * Related: Range#first, Range#end.
+ */
+
+static VALUE
+range_begin(VALUE range)
+{
+ return RANGE_BEG(range);
+}
+
+
+/*
+ * call-seq:
+ * self.end -> object
+ *
+ * Returns the object that defines the end of +self+.
+ *
+ * (1..4).end # => 4
+ * (1...4).end # => 4
+ * (1..).end # => nil
+ *
+ * Related: Range#begin, Range#last.
+ */
+
+
+static VALUE
+range_end(VALUE range)
+{
+ return RANGE_END(range);
+}
- args[0] = beg; args[1] = end; args[2] = range;
- iter[0] = 1; iter[1] = 1;
- rb_iterate((VALUE(*)_((VALUE)))str_step, (VALUE)args, step_i,
- (VALUE)iter);
+
+static VALUE
+first_i(RB_BLOCK_CALL_FUNC_ARGLIST(i, cbarg))
+{
+ VALUE *ary = (VALUE *)cbarg;
+ long n = NUM2LONG(ary[0]);
+
+ if (n <= 0) {
+ rb_iter_break();
+ }
+ rb_ary_push(ary[1], i);
+ n--;
+ ary[0] = LONG2NUM(n);
+ return Qnil;
+}
+
+/*
+ * call-seq:
+ * first -> object
+ * first(n) -> array
+ *
+ * With no argument, returns the first element of +self+, if it exists:
+ *
+ * (1..4).first # => 1
+ * ('a'..'d').first # => "a"
+ *
+ * With non-negative integer argument +n+ given,
+ * returns the first +n+ elements in an array:
+ *
+ * (1..10).first(3) # => [1, 2, 3]
+ * (1..10).first(0) # => []
+ * (1..4).first(50) # => [1, 2, 3, 4]
+ *
+ * Raises an exception if there is no first element:
+ *
+ * (..4).first # Raises RangeError
+ */
+
+static VALUE
+range_first(int argc, VALUE *argv, VALUE range)
+{
+ VALUE n, ary[2];
+
+ if (NIL_P(RANGE_BEG(range))) {
+ rb_raise(rb_eRangeError, "cannot get the first element of beginless range");
+ }
+ if (argc == 0) return RANGE_BEG(range);
+
+ rb_scan_args(argc, argv, "1", &n);
+ ary[0] = n;
+ ary[1] = rb_ary_new2(NUM2LONG(n));
+ rb_block_call(range, idEach, 0, 0, first_i, (VALUE)ary);
+
+ return ary[1];
+}
+
+static VALUE
+rb_int_range_last(int argc, VALUE *argv, VALUE range)
+{
+ static const VALUE ONE = INT2FIX(1);
+
+ VALUE b, e, len_1, len, nv, ary;
+ int x;
+ long n;
+
+ assert(argc > 0);
+
+ b = RANGE_BEG(range);
+ e = RANGE_END(range);
+ assert(RB_INTEGER_TYPE_P(b) && RB_INTEGER_TYPE_P(e));
+
+ x = EXCL(range);
+
+ len_1 = rb_int_minus(e, b);
+ if (x) {
+ e = rb_int_minus(e, ONE);
+ len = len_1;
}
else {
- range_each_func(range, each_i, beg, end, NULL);
+ len = rb_int_plus(len_1, ONE);
}
- return range;
+
+ if (FIXNUM_ZERO_P(len) || rb_num_negative_p(len)) {
+ return rb_ary_new_capa(0);
+ }
+
+ rb_scan_args(argc, argv, "1", &nv);
+ n = NUM2LONG(nv);
+ if (n < 0) {
+ rb_raise(rb_eArgError, "negative array size");
+ }
+
+ nv = LONG2NUM(n);
+ if (RTEST(rb_int_gt(nv, len))) {
+ nv = len;
+ n = NUM2LONG(nv);
+ }
+
+ ary = rb_ary_new_capa(n);
+ b = rb_int_minus(e, nv);
+ while (n) {
+ b = rb_int_plus(b, ONE);
+ rb_ary_push(ary, b);
+ --n;
+ }
+
+ return ary;
}
/*
* call-seq:
- * rng.first => obj
- * rng.begin => obj
- *
- * Returns the first object in <i>rng</i>.
+ * last -> object
+ * last(n) -> array
+ *
+ * With no argument, returns the last element of +self+, if it exists:
+ *
+ * (1..4).last # => 4
+ * ('a'..'d').last # => "d"
+ *
+ * Note that +last+ with no argument returns the end element of +self+
+ * even if #exclude_end? is +true+:
+ *
+ * (1...4).last # => 4
+ * ('a'...'d').last # => "d"
+ *
+ * With non-negative integer argument +n+ given,
+ * returns the last +n+ elements in an array:
+ *
+ * (1..10).last(3) # => [8, 9, 10]
+ * (1..10).last(0) # => []
+ * (1..4).last(50) # => [1, 2, 3, 4]
+ *
+ * Note that +last+ with argument does not return the end element of +self+
+ * if #exclude_end? it +true+:
+ *
+ * (1...4).last(3) # => [1, 2, 3]
+ * ('a'...'d').last(3) # => ["a", "b", "c"]
+ *
+ * Raises an exception if there is no last element:
+ *
+ * (1..).last # Raises RangeError
+ *
*/
static VALUE
-range_first(range)
- VALUE range;
+range_last(int argc, VALUE *argv, VALUE range)
{
- return rb_ivar_get(range, id_beg);
+ VALUE b, e;
+
+ if (NIL_P(RANGE_END(range))) {
+ rb_raise(rb_eRangeError, "cannot get the last element of endless range");
+ }
+ if (argc == 0) return RANGE_END(range);
+
+ b = RANGE_BEG(range);
+ e = RANGE_END(range);
+ if (RB_INTEGER_TYPE_P(b) && RB_INTEGER_TYPE_P(e) &&
+ RB_LIKELY(rb_method_basic_definition_p(rb_cRange, idEach))) {
+ return rb_int_range_last(argc, argv, range);
+ }
+ return rb_ary_last(argc, argv, rb_Array(range));
}
/*
* call-seq:
- * rng.end => obj
- * rng.last => obj
- *
- * Returns the object that defines the end of <i>rng</i>.
- *
- * (1..10).end #=> 10
- * (1...10).end #=> 10
+ * min -> object
+ * min(n) -> array
+ * min {|a, b| ... } -> object
+ * min(n) {|a, b| ... } -> array
+ *
+ * Returns the minimum value in +self+,
+ * using method <tt><=></tt> or a given block for comparison.
+ *
+ * With no argument and no block given,
+ * returns the minimum-valued element of +self+.
+ *
+ * (1..4).min # => 1
+ * ('a'..'d').min # => "a"
+ * (-4..-1).min # => -4
+ *
+ * With non-negative integer argument +n+ given, and no block given,
+ * returns the +n+ minimum-valued elements of +self+ in an array:
+ *
+ * (1..4).min(2) # => [1, 2]
+ * ('a'..'d').min(2) # => ["a", "b"]
+ * (-4..-1).min(2) # => [-4, -3]
+ * (1..4).min(50) # => [1, 2, 3, 4]
+ *
+ * If a block is given, it is called:
+ *
+ * - First, with the first two element of +self+.
+ * - Then, sequentially, with the so-far minimum value and the next element of +self+.
+ *
+ * To illustrate:
+ *
+ * (1..4).min {|a, b| p [a, b]; a <=> b } # => 1
+ *
+ * Output:
+ *
+ * [2, 1]
+ * [3, 1]
+ * [4, 1]
+ *
+ * With no argument and a block given,
+ * returns the return value of the last call to the block:
+ *
+ * (1..4).min {|a, b| -(a <=> b) } # => 4
+ *
+ * With non-negative integer argument +n+ given, and a block given,
+ * returns the return values of the last +n+ calls to the block in an array:
+ *
+ * (1..4).min(2) {|a, b| -(a <=> b) } # => [4, 3]
+ * (1..4).min(50) {|a, b| -(a <=> b) } # => [4, 3, 2, 1]
+ *
+ * Returns an empty array if +n+ is zero:
+ *
+ * (1..4).min(0) # => []
+ * (1..4).min(0) {|a, b| -(a <=> b) } # => []
+ *
+ * Returns +nil+ or an empty array if:
+ *
+ * - The begin value of the range is larger than the end value:
+ *
+ * (4..1).min # => nil
+ * (4..1).min(2) # => []
+ * (4..1).min {|a, b| -(a <=> b) } # => nil
+ * (4..1).min(2) {|a, b| -(a <=> b) } # => []
+ *
+ * - The begin value of an exclusive range is equal to the end value:
+ *
+ * (1...1).min # => nil
+ * (1...1).min(2) # => []
+ * (1...1).min {|a, b| -(a <=> b) } # => nil
+ * (1...1).min(2) {|a, b| -(a <=> b) } # => []
+ *
+ * Raises an exception if either:
+ *
+ * - +self+ is a beginless range: <tt>(..4)</tt>.
+ * - A block is given and +self+ is an endless range.
+ *
+ * Related: Range#max, Range#minmax.
*/
static VALUE
-range_last(range)
- VALUE range;
+range_min(int argc, VALUE *argv, VALUE range)
{
- return rb_ivar_get(range, id_end);
+ if (NIL_P(RANGE_BEG(range))) {
+ rb_raise(rb_eRangeError, "cannot get the minimum of beginless range");
+ }
+
+ if (rb_block_given_p()) {
+ if (NIL_P(RANGE_END(range))) {
+ rb_raise(rb_eRangeError, "cannot get the minimum of endless range with custom comparison method");
+ }
+ return rb_call_super(argc, argv);
+ }
+ else if (argc != 0) {
+ return range_first(argc, argv, range);
+ }
+ else {
+ struct cmp_opt_data cmp_opt = { 0, 0 };
+ VALUE b = RANGE_BEG(range);
+ VALUE e = RANGE_END(range);
+ int c = NIL_P(e) ? -1 : OPTIMIZED_CMP(b, e, cmp_opt);
+
+ if (c > 0 || (c == 0 && EXCL(range)))
+ return Qnil;
+ return b;
+ }
}
-VALUE
-rb_range_beg_len(range, begp, lenp, len, err)
- VALUE range;
- long *begp, *lenp;
- long len;
- int err;
+/*
+ * call-seq:
+ * max -> object
+ * max(n) -> array
+ * max {|a, b| ... } -> object
+ * max(n) {|a, b| ... } -> array
+ *
+ * Returns the maximum value in +self+,
+ * using method <tt><=></tt> or a given block for comparison.
+ *
+ * With no argument and no block given,
+ * returns the maximum-valued element of +self+.
+ *
+ * (1..4).max # => 4
+ * ('a'..'d').max # => "d"
+ * (-4..-1).max # => -1
+ *
+ * With non-negative integer argument +n+ given, and no block given,
+ * returns the +n+ maximum-valued elements of +self+ in an array:
+ *
+ * (1..4).max(2) # => [4, 3]
+ * ('a'..'d').max(2) # => ["d", "c"]
+ * (-4..-1).max(2) # => [-1, -2]
+ * (1..4).max(50) # => [4, 3, 2, 1]
+ *
+ * If a block is given, it is called:
+ *
+ * - First, with the first two element of +self+.
+ * - Then, sequentially, with the so-far maximum value and the next element of +self+.
+ *
+ * To illustrate:
+ *
+ * (1..4).max {|a, b| p [a, b]; a <=> b } # => 4
+ *
+ * Output:
+ *
+ * [2, 1]
+ * [3, 2]
+ * [4, 3]
+ *
+ * With no argument and a block given,
+ * returns the return value of the last call to the block:
+ *
+ * (1..4).max {|a, b| -(a <=> b) } # => 1
+ *
+ * With non-negative integer argument +n+ given, and a block given,
+ * returns the return values of the last +n+ calls to the block in an array:
+ *
+ * (1..4).max(2) {|a, b| -(a <=> b) } # => [1, 2]
+ * (1..4).max(50) {|a, b| -(a <=> b) } # => [1, 2, 3, 4]
+ *
+ * Returns an empty array if +n+ is zero:
+ *
+ * (1..4).max(0) # => []
+ * (1..4).max(0) {|a, b| -(a <=> b) } # => []
+ *
+ * Returns +nil+ or an empty array if:
+ *
+ * - The begin value of the range is larger than the end value:
+ *
+ * (4..1).max # => nil
+ * (4..1).max(2) # => []
+ * (4..1).max {|a, b| -(a <=> b) } # => nil
+ * (4..1).max(2) {|a, b| -(a <=> b) } # => []
+ *
+ * - The begin value of an exclusive range is equal to the end value:
+ *
+ * (1...1).max # => nil
+ * (1...1).max(2) # => []
+ * (1...1).max {|a, b| -(a <=> b) } # => nil
+ * (1...1).max(2) {|a, b| -(a <=> b) } # => []
+ *
+ * Raises an exception if either:
+ *
+ * - +self+ is a endless range: <tt>(1..)</tt>.
+ * - A block is given and +self+ is a beginless range.
+ *
+ * Related: Range#min, Range#minmax.
+ *
+ */
+
+static VALUE
+range_max(int argc, VALUE *argv, VALUE range)
{
- long beg, end, b, e;
+ VALUE e = RANGE_END(range);
+ int nm = FIXNUM_P(e) || rb_obj_is_kind_of(e, rb_cNumeric);
+
+ if (NIL_P(RANGE_END(range))) {
+ rb_raise(rb_eRangeError, "cannot get the maximum of endless range");
+ }
- if (!rb_obj_is_kind_of(range, rb_cRange)) return Qfalse;
+ VALUE b = RANGE_BEG(range);
- beg = b = NUM2LONG(rb_ivar_get(range, id_beg));
- end = e = NUM2LONG(rb_ivar_get(range, id_end));
+ if (rb_block_given_p() || (EXCL(range) && !nm) || argc) {
+ if (NIL_P(b)) {
+ rb_raise(rb_eRangeError, "cannot get the maximum of beginless range with custom comparison method");
+ }
+ return rb_call_super(argc, argv);
+ }
+ else {
+ struct cmp_opt_data cmp_opt = { 0, 0 };
+ int c = NIL_P(b) ? -1 : OPTIMIZED_CMP(b, e, cmp_opt);
+
+ if (c > 0)
+ return Qnil;
+ if (EXCL(range)) {
+ if (!RB_INTEGER_TYPE_P(e)) {
+ rb_raise(rb_eTypeError, "cannot exclude non Integer end value");
+ }
+ if (c == 0) return Qnil;
+ if (!RB_INTEGER_TYPE_P(b)) {
+ rb_raise(rb_eTypeError, "cannot exclude end value with non Integer begin value");
+ }
+ if (FIXNUM_P(e)) {
+ return LONG2NUM(FIX2LONG(e) - 1);
+ }
+ return rb_funcall(e, '-', 1, INT2FIX(1));
+ }
+ return e;
+ }
+}
+/*
+ * call-seq:
+ * minmax -> [object, object]
+ * minmax {|a, b| ... } -> [object, object]
+ *
+ * Returns a 2-element array containing the minimum and maximum value in +self+,
+ * either according to comparison method <tt><=></tt> or a given block.
+ *
+ * With no block given, returns the minimum and maximum values,
+ * using <tt><=></tt> for comparison:
+ *
+ * (1..4).minmax # => [1, 4]
+ * (1...4).minmax # => [1, 3]
+ * ('a'..'d').minmax # => ["a", "d"]
+ * (-4..-1).minmax # => [-4, -1]
+ *
+ * With a block given, the block must return an integer:
+ *
+ * - Negative if +a+ is smaller than +b+.
+ * - Zero if +a+ and +b+ are equal.
+ * - Positive if +a+ is larger than +b+.
+ *
+ * The block is called <tt>self.size</tt> times to compare elements;
+ * returns a 2-element Array containing the minimum and maximum values from +self+,
+ * per the block:
+ *
+ * (1..4).minmax {|a, b| -(a <=> b) } # => [4, 1]
+ *
+ * Returns <tt>[nil, nil]</tt> if:
+ *
+ * - The begin value of the range is larger than the end value:
+ *
+ * (4..1).minmax # => [nil, nil]
+ * (4..1).minmax {|a, b| -(a <=> b) } # => [nil, nil]
+ *
+ * - The begin value of an exclusive range is equal to the end value:
+ *
+ * (1...1).minmax # => [nil, nil]
+ * (1...1).minmax {|a, b| -(a <=> b) } # => [nil, nil]
+ *
+ * Raises an exception if +self+ is a beginless or an endless range.
+ *
+ * Related: Range#min, Range#max.
+ *
+ */
+
+static VALUE
+range_minmax(VALUE range)
+{
+ if (rb_block_given_p()) {
+ return rb_call_super(0, NULL);
+ }
+ return rb_assoc_new(
+ rb_funcall(range, id_min, 0),
+ rb_funcall(range, id_max, 0)
+ );
+}
+
+int
+rb_range_values(VALUE range, VALUE *begp, VALUE *endp, int *exclp)
+{
+ VALUE b, e;
+ int excl;
+
+ if (rb_obj_is_kind_of(range, rb_cRange)) {
+ b = RANGE_BEG(range);
+ e = RANGE_END(range);
+ excl = EXCL(range);
+ }
+ else if (RTEST(rb_obj_is_kind_of(range, rb_cArithSeq))) {
+ return (int)Qfalse;
+ }
+ else {
+ VALUE x;
+ b = rb_check_funcall(range, id_beg, 0, 0);
+ if (b == Qundef) return (int)Qfalse;
+ e = rb_check_funcall(range, id_end, 0, 0);
+ if (e == Qundef) return (int)Qfalse;
+ x = rb_check_funcall(range, rb_intern("exclude_end?"), 0, 0);
+ if (x == Qundef) return (int)Qfalse;
+ excl = RTEST(x);
+ }
+ *begp = b;
+ *endp = e;
+ *exclp = excl;
+ return (int)Qtrue;
+}
+
+/* Extract the components of a Range.
+ *
+ * You can use +err+ to control the behavior of out-of-range and exception.
+ *
+ * When +err+ is 0 or 2, if the begin offset is greater than +len+,
+ * it is out-of-range. The +RangeError+ is raised only if +err+ is 2,
+ * in this case. If +err+ is 0, +Qnil+ will be returned.
+ *
+ * When +err+ is 1, the begin and end offsets won't be adjusted even if they
+ * are greater than +len+. It allows +rb_ary_aset+ extends arrays.
+ *
+ * If the begin component of the given range is negative and is too-large
+ * abstract value, the +RangeError+ is raised only +err+ is 1 or 2.
+ *
+ * The case of <code>err = 0</code> is used in item accessing methods such as
+ * +rb_ary_aref+, +rb_ary_slice_bang+, and +rb_str_aref+.
+ *
+ * The case of <code>err = 1</code> is used in Array's methods such as
+ * +rb_ary_aset+ and +rb_ary_fill+.
+ *
+ * The case of <code>err = 2</code> is used in +rb_str_aset+.
+ */
+VALUE
+rb_range_component_beg_len(VALUE b, VALUE e, int excl,
+ long *begp, long *lenp, long len, int err)
+{
+ long beg, end;
+
+ beg = NIL_P(b) ? 0 : NUM2LONG(b);
+ end = NIL_P(e) ? -1 : NUM2LONG(e);
+ if (NIL_P(e)) excl = 0;
if (beg < 0) {
- beg += len;
- if (beg < 0) goto out_of_range;
+ beg += len;
+ if (beg < 0)
+ goto out_of_range;
}
+ if (end < 0)
+ end += len;
+ if (!excl)
+ end++; /* include end point */
if (err == 0 || err == 2) {
- if (beg > len) goto out_of_range;
- if (end > len) end = len;
+ if (beg > len)
+ goto out_of_range;
+ if (end > len)
+ end = len;
}
- if (end < 0) end += len;
- if (!EXCL(range)) end++; /* include end point */
len = end - beg;
- if (len < 0) len = 0;
+ if (len < 0)
+ len = 0;
*begp = beg;
*lenp = len;
return Qtrue;
out_of_range:
- if (err) {
- rb_raise(rb_eRangeError, "%ld..%s%ld out of range",
- b, EXCL(range)? "." : "", e);
- }
return Qnil;
}
+VALUE
+rb_range_beg_len(VALUE range, long *begp, long *lenp, long len, int err)
+{
+ VALUE b, e;
+ int excl;
+
+ if (!rb_range_values(range, &b, &e, &excl))
+ return Qfalse;
+
+ VALUE res = rb_range_component_beg_len(b, e, excl, begp, lenp, len, err);
+ if (NIL_P(res) && err) {
+ rb_raise(rb_eRangeError, "%+"PRIsVALUE" out of range", range);
+ }
+
+ return res;
+}
+
/*
* call-seq:
- * rng.to_s => string
+ * to_s -> string
+ *
+ * Returns a string representation of +self+,
+ * including <tt>begin.to_s</tt> and <tt>end.to_s</tt>:
+ *
+ * (1..4).to_s # => "1..4"
+ * (1...4).to_s # => "1...4"
+ * (1..).to_s # => "1.."
+ * (..4).to_s # => "..4"
+ *
+ * Note that returns from #to_s and #inspect may differ:
+ *
+ * ('a'..'d').to_s # => "a..d"
+ * ('a'..'d').inspect # => "\"a\"..\"d\""
+ *
+ * Related: Range#inspect.
*
- * Convert this range object to a printable form.
*/
static VALUE
-range_to_s(range)
- VALUE range;
+range_to_s(VALUE range)
{
VALUE str, str2;
- str = rb_obj_as_string(rb_ivar_get(range, id_beg));
- str2 = rb_obj_as_string(rb_ivar_get(range, id_end));
+ str = rb_obj_as_string(RANGE_BEG(range));
+ str2 = rb_obj_as_string(RANGE_END(range));
str = rb_str_dup(str);
- rb_str_cat(str, "...", EXCL(range)?3:2);
+ rb_str_cat(str, "...", EXCL(range) ? 3 : 2);
rb_str_append(str, str2);
- OBJ_INFECT(str, str2);
+
+ return str;
+}
+
+static VALUE
+inspect_range(VALUE range, VALUE dummy, int recur)
+{
+ VALUE str, str2 = Qundef;
+
+ if (recur) {
+ return rb_str_new2(EXCL(range) ? "(... ... ...)" : "(... .. ...)");
+ }
+ if (!NIL_P(RANGE_BEG(range)) || NIL_P(RANGE_END(range))) {
+ str = rb_str_dup(rb_inspect(RANGE_BEG(range)));
+ }
+ else {
+ str = rb_str_new(0, 0);
+ }
+ rb_str_cat(str, "...", EXCL(range) ? 3 : 2);
+ if (NIL_P(RANGE_BEG(range)) || !NIL_P(RANGE_END(range))) {
+ str2 = rb_inspect(RANGE_END(range));
+ }
+ if (str2 != Qundef) rb_str_append(str, str2);
return str;
}
/*
* call-seq:
- * rng.inspect => string
+ * inspect -> string
+ *
+ * Returns a string representation of +self+,
+ * including <tt>begin.inspect</tt> and <tt>end.inspect</tt>:
+ *
+ * (1..4).inspect # => "1..4"
+ * (1...4).inspect # => "1...4"
+ * (1..).inspect # => "1.."
+ * (..4).inspect # => "..4"
+ *
+ * Note that returns from #to_s and #inspect may differ:
+ *
+ * ('a'..'d').to_s # => "a..d"
+ * ('a'..'d').inspect # => "\"a\"..\"d\""
+ *
+ * Related: Range#to_s.
*
- * Convert this range object to a printable form (using
- * <code>inspect</code> to convert the start and end
- * objects).
*/
static VALUE
-range_inspect(range)
- VALUE range;
+range_inspect(VALUE range)
{
- VALUE str, str2;
+ return rb_exec_recursive(inspect_range, range, 0);
+}
- str = rb_inspect(rb_ivar_get(range, id_beg));
- str2 = rb_inspect(rb_ivar_get(range, id_end));
- str = rb_str_dup(str);
- rb_str_cat(str, "...", EXCL(range)?3:2);
- rb_str_append(str, str2);
- OBJ_INFECT(str, str2);
+static VALUE range_include_internal(VALUE range, VALUE val, int string_use_cover);
- return str;
+/*
+ * call-seq:
+ * self === object -> true or false
+ *
+ * Returns +true+ if +object+ is between <tt>self.begin</tt> and <tt>self.end</tt>.
+ * +false+ otherwise:
+ *
+ * (1..4) === 2 # => true
+ * (1..4) === 5 # => false
+ * (1..4) === 'a' # => false
+ * (1..4) === 4 # => true
+ * (1...4) === 4 # => false
+ * ('a'..'d') === 'c' # => true
+ * ('a'..'d') === 'e' # => false
+ *
+ * A case statement uses method <tt>===</tt>, and so:
+ *
+ * case 79
+ * when (1..50)
+ * "low"
+ * when (51..75)
+ * "medium"
+ * when (76..100)
+ * "high"
+ * end # => "high"
+ *
+ * case "2.6.5"
+ * when ..."2.4"
+ * "EOL"
+ * when "2.4"..."2.5"
+ * "maintenance"
+ * when "2.5"..."3.0"
+ * "stable"
+ * when "3.1"..
+ * "upcoming"
+ * end # => "stable"
+ *
+ */
+
+static VALUE
+range_eqq(VALUE range, VALUE val)
+{
+ VALUE ret = range_include_internal(range, val, 1);
+ if (ret != Qundef) return ret;
+ return r_cover_p(range, RANGE_BEG(range), RANGE_END(range), val);
}
+
/*
* call-seq:
- * rng === obj => true or false
- * rng.member?(val) => true or false
- * rng.include?(val) => true or false
- *
- * Returns <code>true</code> if <i>obj</i> is an element of
- * <i>rng</i>, <code>false</code> otherwise. Conveniently,
- * <code>===</code> is the comparison operator used by
- * <code>case</code> statements.
- *
- * case 79
- * when 1..50 then print "low\n"
- * when 51..75 then print "medium\n"
- * when 76..100 then print "high\n"
- * end
- *
- * <em>produces:</em>
- *
- * high
+ * include?(object) -> true or false
+ *
+ * Returns +true+ if +object+ is an element of +self+, +false+ otherwise:
+ *
+ * (1..4).include?(2) # => true
+ * (1..4).include?(5) # => false
+ * (1..4).include?(4) # => true
+ * (1...4).include?(4) # => false
+ * ('a'..'d').include?('b') # => true
+ * ('a'..'d').include?('e') # => false
+ * ('a'..'d').include?('B') # => false
+ * ('a'..'d').include?('d') # => true
+ * ('a'...'d').include?('d') # => false
+ *
+ * If begin and end are numeric, #include? behaves like #cover?
+ *
+ * (1..3).include?(1.5) # => true
+ * (1..3).cover?(1.5) # => true
+ *
+ * But when not numeric, the two methods may differ:
+ *
+ * ('a'..'d').include?('cc') # => false
+ * ('a'..'d').cover?('cc') # => true
+ *
+ * Related: Range#cover?.
+ *
+ * Range#member? is an alias for Range#include?.
*/
static VALUE
-range_include(range, val)
- VALUE range, val;
+range_include(VALUE range, VALUE val)
{
- VALUE beg, end;
+ VALUE ret = range_include_internal(range, val, 0);
+ if (ret != Qundef) return ret;
+ return rb_call_super(1, &val);
+}
- beg = rb_ivar_get(range, id_beg);
- end = rb_ivar_get(range, id_end);
- if (r_le(beg, val)) {
- if (EXCL(range)) {
- if (r_lt(val, end)) return Qtrue;
- }
- else {
- if (r_le(val, end)) return Qtrue;
+static VALUE
+range_include_internal(VALUE range, VALUE val, int string_use_cover)
+{
+ VALUE beg = RANGE_BEG(range);
+ VALUE end = RANGE_END(range);
+ int nv = FIXNUM_P(beg) || FIXNUM_P(end) ||
+ linear_object_p(beg) || linear_object_p(end);
+
+ if (nv ||
+ !NIL_P(rb_check_to_integer(beg, "to_int")) ||
+ !NIL_P(rb_check_to_integer(end, "to_int"))) {
+ return r_cover_p(range, beg, end, val);
+ }
+ else if (RB_TYPE_P(beg, T_STRING) || RB_TYPE_P(end, T_STRING)) {
+ if (RB_TYPE_P(beg, T_STRING) && RB_TYPE_P(end, T_STRING)) {
+ if (string_use_cover) {
+ return r_cover_p(range, beg, end, val);
+ }
+ else {
+ VALUE rb_str_include_range_p(VALUE beg, VALUE end, VALUE val, VALUE exclusive);
+ return rb_str_include_range_p(beg, end, val, RANGE_EXCL(range));
+ }
+ }
+ else if (NIL_P(beg)) {
+ VALUE r = rb_funcall(val, id_cmp, 1, end);
+ if (NIL_P(r)) return Qfalse;
+ return RBOOL(rb_cmpint(r, val, end) <= 0);
+ }
+ else if (NIL_P(end)) {
+ VALUE r = rb_funcall(beg, id_cmp, 1, val);
+ if (NIL_P(r)) return Qfalse;
+ return RBOOL(rb_cmpint(r, beg, val) <= 0);
}
}
+ return Qundef;
+}
+
+static int r_cover_range_p(VALUE range, VALUE beg, VALUE end, VALUE val);
+
+/*
+ * call-seq:
+ * cover?(object) -> true or false
+ * cover?(range) -> true or false
+ *
+ * Returns +true+ if the given argument is within +self+, +false+ otherwise.
+ *
+ * With non-range argument +object+, evaluates with <tt><=</tt> and <tt><</tt>.
+ *
+ * For range +self+ with included end value (<tt>#exclude_end? == false</tt>),
+ * evaluates thus:
+ *
+ * self.begin <= object <= self.end
+ *
+ * Examples:
+ *
+ * r = (1..4)
+ * r.cover?(1) # => true
+ * r.cover?(4) # => true
+ * r.cover?(0) # => false
+ * r.cover?(5) # => false
+ * r.cover?('foo') # => false
+
+ * r = ('a'..'d')
+ * r.cover?('a') # => true
+ * r.cover?('d') # => true
+ * r.cover?(' ') # => false
+ * r.cover?('e') # => false
+ * r.cover?(0) # => false
+ *
+ * For range +r+ with excluded end value (<tt>#exclude_end? == true</tt>),
+ * evaluates thus:
+ *
+ * r.begin <= object < r.end
+ *
+ * Examples:
+ *
+ * r = (1...4)
+ * r.cover?(1) # => true
+ * r.cover?(3) # => true
+ * r.cover?(0) # => false
+ * r.cover?(4) # => false
+ * r.cover?('foo') # => false
+
+ * r = ('a'...'d')
+ * r.cover?('a') # => true
+ * r.cover?('c') # => true
+ * r.cover?(' ') # => false
+ * r.cover?('d') # => false
+ * r.cover?(0) # => false
+ *
+ * With range argument +range+, compares the first and last
+ * elements of +self+ and +range+:
+ *
+ * r = (1..4)
+ * r.cover?(1..4) # => true
+ * r.cover?(0..4) # => false
+ * r.cover?(1..5) # => false
+ * r.cover?('a'..'d') # => false
+
+ * r = (1...4)
+ * r.cover?(1..3) # => true
+ * r.cover?(1..4) # => false
+ *
+ * If begin and end are numeric, #cover? behaves like #include?
+ *
+ * (1..3).cover?(1.5) # => true
+ * (1..3).include?(1.5) # => true
+ *
+ * But when not numeric, the two methods may differ:
+ *
+ * ('a'..'d').cover?('cc') # => true
+ * ('a'..'d').include?('cc') # => false
+ *
+ * Returns +false+ if either:
+ *
+ * - The begin value of +self+ is larger than its end value.
+ * - An internal call to <tt><=></tt> returns +nil+;
+ * that is, the operands are not comparable.
+ *
+ * Beginless ranges cover all values of the same type before the end,
+ * excluding the end for exclusive ranges. Beginless ranges cover
+ * ranges that end before the end of the beginless range, or at the
+ * end of the beginless range for inclusive ranges.
+ *
+ * (..2).cover?(1) # => true
+ * (..2).cover?(2) # => true
+ * (..2).cover?(3) # => false
+ * (...2).cover?(2) # => false
+ * (..2).cover?("2") # => false
+ * (..2).cover?(..2) # => true
+ * (..2).cover?(...2) # => true
+ * (..2).cover?(.."2") # => false
+ * (...2).cover?(..2) # => false
+ *
+ * Endless ranges cover all values of the same type after the
+ * beginning. Endless exclusive ranges do not cover endless
+ * inclusive ranges.
+ *
+ * (2..).cover?(1) # => false
+ * (2..).cover?(3) # => true
+ * (2...).cover?(3) # => true
+ * (2..).cover?(2) # => true
+ * (2..).cover?("2") # => false
+ * (2..).cover?(2..) # => true
+ * (2..).cover?(2...) # => true
+ * (2..).cover?("2"..) # => false
+ * (2...).cover?(2..) # => false
+ * (2...).cover?(3...) # => true
+ * (2...).cover?(3..) # => false
+ * (3..).cover?(2..) # => false
+ *
+ * Ranges that are both beginless and endless cover all values and
+ * ranges, and return true for all arguments, with the exception that
+ * beginless and endless exclusive ranges do not cover endless
+ * inclusive ranges.
+ *
+ * (nil...).cover?(Object.new) # => true
+ * (nil...).cover?(nil...) # => true
+ * (nil..).cover?(nil...) # => true
+ * (nil...).cover?(nil..) # => false
+ * (nil...).cover?(1..) # => false
+ *
+ * Related: Range#include?.
+ *
+ */
+
+static VALUE
+range_cover(VALUE range, VALUE val)
+{
+ VALUE beg, end;
+
+ beg = RANGE_BEG(range);
+ end = RANGE_END(range);
+
+ if (rb_obj_is_kind_of(val, rb_cRange)) {
+ return RBOOL(r_cover_range_p(range, beg, end, val));
+ }
+ return r_cover_p(range, beg, end, val);
+}
+
+static VALUE
+r_call_max(VALUE r)
+{
+ return rb_funcallv(r, rb_intern("max"), 0, 0);
+}
+
+static int
+r_cover_range_p(VALUE range, VALUE beg, VALUE end, VALUE val)
+{
+ VALUE val_beg, val_end, val_max;
+ int cmp_end;
+
+ val_beg = RANGE_BEG(val);
+ val_end = RANGE_END(val);
+
+ if (!NIL_P(end) && NIL_P(val_end)) return FALSE;
+ if (!NIL_P(beg) && NIL_P(val_beg)) return FALSE;
+ if (!NIL_P(val_beg) && !NIL_P(val_end) && r_less(val_beg, val_end) > (EXCL(val) ? -1 : 0)) return FALSE;
+ if (!NIL_P(val_beg) && !r_cover_p(range, beg, end, val_beg)) return FALSE;
+
+
+ if (!NIL_P(val_end) && !NIL_P(end)) {
+ VALUE r_cmp_end = rb_funcall(end, id_cmp, 1, val_end);
+ if (NIL_P(r_cmp_end)) return FALSE;
+ cmp_end = rb_cmpint(r_cmp_end, end, val_end);
+ }
+ else {
+ cmp_end = r_less(end, val_end);
+ }
+
+
+ if (EXCL(range) == EXCL(val)) {
+ return cmp_end >= 0;
+ }
+ else if (EXCL(range)) {
+ return cmp_end > 0;
+ }
+ else if (cmp_end >= 0) {
+ return TRUE;
+ }
+
+ val_max = rb_rescue2(r_call_max, val, 0, Qnil, rb_eTypeError, (VALUE)0);
+ if (NIL_P(val_max)) return FALSE;
+
+ return r_less(end, val_max) >= 0;
+}
+
+static VALUE
+r_cover_p(VALUE range, VALUE beg, VALUE end, VALUE val)
+{
+ if (NIL_P(beg) || r_less(beg, val) <= 0) {
+ int excl = EXCL(range);
+ if (NIL_P(end) || r_less(val, end) <= -excl)
+ return Qtrue;
+ }
return Qfalse;
}
+static VALUE
+range_dumper(VALUE range)
+{
+ VALUE v = rb_obj_alloc(rb_cObject);
+
+ rb_ivar_set(v, id_excl, RANGE_EXCL(range));
+ rb_ivar_set(v, id_beg, RANGE_BEG(range));
+ rb_ivar_set(v, id_end, RANGE_END(range));
+ return v;
+}
+
+static VALUE
+range_loader(VALUE range, VALUE obj)
+{
+ VALUE beg, end, excl;
+
+ if (!RB_TYPE_P(obj, T_OBJECT) || RBASIC(obj)->klass != rb_cObject) {
+ rb_raise(rb_eTypeError, "not a dumped range object");
+ }
+
+ range_modify(range);
+ beg = rb_ivar_get(obj, id_beg);
+ end = rb_ivar_get(obj, id_end);
+ excl = rb_ivar_get(obj, id_excl);
+ if (!NIL_P(excl)) {
+ range_init(range, beg, end, RBOOL(RTEST(excl)));
+ }
+ return range;
+}
+
+static VALUE
+range_alloc(VALUE klass)
+{
+ /* rb_struct_alloc_noinit itself should not be used because
+ * rb_marshal_define_compat uses equality of allocation function */
+ return rb_struct_alloc_noinit(klass);
+}
-/* A <code>Range</code> represents an interval---a set of values with a
- * start and an end. Ranges may be constructed using the
- * <em>s</em><code>..</code><em>e</em> and
- * <em>s</em><code>...</code><em>e</em> literals, or with
- * <code>Range::new</code>. Ranges constructed using <code>..</code>
- * run from the start to the end inclusively. Those created using
- * <code>...</code> exclude the end value. When used as an iterator,
- * ranges return each value in the sequence.
- *
- * (-1..-5).to_a #=> []
- * (-5..-1).to_a #=> [-5, -4, -3, -2, -1]
- * ('a'..'e').to_a #=> ["a", "b", "c", "d", "e"]
- * ('a'...'e').to_a #=> ["a", "b", "c", "d"]
- *
- * Ranges can be constructed using objects of any type, as long as the
- * objects can be compared using their <code><=></code> operator and
- * they support the <code>succ</code> method to return the next object
- * in sequence.
- *
- * class Xs # represent a string of 'x's
- * include Comparable
- * attr :length
- * def initialize(n)
- * @length = n
- * end
- * def succ
- * Xs.new(@length + 1)
- * end
- * def <=>(other)
- * @length <=> other.length
- * end
- * def to_s
- * sprintf "%2d #{inspect}", @length
- * end
- * def inspect
- * 'x' * @length
- * end
+/*
+ * call-seq:
+ * count -> integer
+ * count(object) -> integer
+ * count {|element| ... } -> integer
+ *
+ * Returns the count of elements, based on an argument or block criterion, if given.
+ *
+ * With no argument and no block given, returns the number of elements:
+ *
+ * (1..4).count # => 4
+ * (1...4).count # => 3
+ * ('a'..'d').count # => 4
+ * ('a'...'d').count # => 3
+ * (1..).count # => Infinity
+ * (..4).count # => Infinity
+ *
+ * With argument +object+, returns the number of +object+ found in +self+,
+ * which will usually be zero or one:
+ *
+ * (1..4).count(2) # => 1
+ * (1..4).count(5) # => 0
+ * (1..4).count('a') # => 0
+ *
+ * With a block given, calls the block with each element;
+ * returns the number of elements for which the block returns a truthy value:
+ *
+ * (1..4).count {|element| element < 3 } # => 2
+ *
+ * Related: Range#size.
+ */
+static VALUE
+range_count(int argc, VALUE *argv, VALUE range)
+{
+ if (argc != 0) {
+ /* It is odd for instance (1...).count(0) to return Infinity. Just let
+ * it loop. */
+ return rb_call_super(argc, argv);
+ }
+ else if (rb_block_given_p()) {
+ /* Likewise it is odd for instance (1...).count {|x| x == 0 } to return
+ * Infinity. Just let it loop. */
+ return rb_call_super(argc, argv);
+ }
+ else if (NIL_P(RANGE_END(range))) {
+ /* We are confident that the answer is Infinity. */
+ return DBL2NUM(HUGE_VAL);
+ }
+ else if (NIL_P(RANGE_BEG(range))) {
+ /* We are confident that the answer is Infinity. */
+ return DBL2NUM(HUGE_VAL);
+ }
+ else {
+ return rb_call_super(argc, argv);
+ }
+}
+
+/* A \Range object represents a collection of values
+ * that are between given begin and end values.
+ *
+ * You can create an \Range object explicitly with:
+ *
+ * - A {range literal}[doc/syntax/literals_rdoc.html#label-Range+Literals]:
+ *
+ * # Ranges that use '..' to include the given end value.
+ * (1..4).to_a # => [1, 2, 3, 4]
+ * ('a'..'d').to_a # => ["a", "b", "c", "d"]
+ * # Ranges that use '...' to exclude the given end value.
+ * (1...4).to_a # => [1, 2, 3]
+ * ('a'...'d').to_a # => ["a", "b", "c"]
+ *
+ * A range may be created using method Range.new:
+ *
+ * # Ranges that by default include the given end value.
+ * Range.new(1, 4).to_a # => [1, 2, 3, 4]
+ * Range.new('a', 'd').to_a # => ["a", "b", "c", "d"]
+ * # Ranges that use third argument +exclude_end+ to exclude the given end value.
+ * Range.new(1, 4, true).to_a # => [1, 2, 3]
+ * Range.new('a', 'd', true).to_a # => ["a", "b", "c"]
+ *
+ * == Beginless Ranges
+ *
+ * A _beginless_ _range_ has a definite end value, but a +nil+ begin value.
+ * Such a range includes all values up to the end value.
+ *
+ * r = (..4) # => nil..4
+ * r.begin # => nil
+ * r.include?(-50) # => true
+ * r.include?(4) # => true
+ *
+ * r = (...4) # => nil...4
+ * r.include?(4) # => false
+ *
+ * Range.new(nil, 4) # => nil..4
+ * Range.new(nil, 4, true) # => nil...4
+ *
+ * A beginless range may be used to slice an array:
+ *
+ * a = [1, 2, 3, 4]
+ * r = (..2) # => nil...2
+ * a[r] # => [1, 2]
+ *
+ * \Method +each+ for a beginless range raises an exception.
+ *
+ * == Endless Ranges
+ *
+ * An _endless_ _range_ has a definite begin value, but a +nil+ end value.
+ * Such a range includes all values from the begin value.
+ *
+ * r = (1..) # => 1..
+ * r.end # => nil
+ * r.include?(50) # => true
+ *
+ * Range.new(1, nil) # => 1..
+ *
+ * The literal for an endless range may be written with either two dots
+ * or three.
+ * The range has the same elements, either way.
+ * But note that the two are not equal:
+ *
+ * r0 = (1..) # => 1..
+ * r1 = (1...) # => 1...
+ * r0.begin == r1.begin # => true
+ * r0.end == r1.end # => true
+ * r0 == r1 # => false
+ *
+ * An endless range may be used to slice an array:
+ *
+ * a = [1, 2, 3, 4]
+ * r = (2..) # => 2..
+ * a[r] # => [3, 4]
+ *
+ * \Method +each+ for an endless range calls the given block indefinitely:
+ *
+ * a = []
+ * r = (1..)
+ * r.each do |i|
+ * a.push(i) if i.even?
+ * break if i > 10
+ * end
+ * a # => [2, 4, 6, 8, 10]
+ *
+ * == Ranges and Other Classes
+ *
+ * An object may be put into a range if its class implements
+ * instance method <tt><=></tt>.
+ * Ruby core classes that do so include Array, Complex, File::Stat,
+ * Float, Integer, Kernel, Module, Numeric, Rational, String, Symbol, and Time.
+ *
+ * Example:
+ *
+ * t0 = Time.now # => 2021-09-19 09:22:48.4854986 -0500
+ * t1 = Time.now # => 2021-09-19 09:22:56.0365079 -0500
+ * t2 = Time.now # => 2021-09-19 09:23:08.5263283 -0500
+ * (t0..t2).include?(t1) # => true
+ * (t0..t1).include?(t2) # => false
+ *
+ * A range can be iterated over only if its elements
+ * implement instance method +succ+.
+ * Ruby core classes that do so include Integer, String, and Symbol
+ * (but not the other classes mentioned above).
+ *
+ * Iterator methods include:
+ *
+ * - In \Range itself: #each, #step, and #%
+ * - Included from module Enumerable: #each_entry, #each_with_index,
+ * #each_with_object, #each_slice, #each_cons, and #reverse_each.
+ *
+ * Example:
+ *
+ * a = []
+ * (1..4).each {|i| a.push(i) }
+ * a # => [1, 2, 3, 4]
+ *
+ * == Ranges and User-Defined Classes
+ *
+ * A user-defined class that is to be used in a range
+ * must implement instance <tt><=></tt>;
+ * see {Integer#<=>}[Integer.html#label-method-i-3C-3D-3E].
+ * To make iteration available, it must also implement
+ * instance method +succ+; see Integer#succ.
+ *
+ * The class below implements both <tt><=></tt> and +succ+,
+ * and so can be used both to construct ranges and to iterate over them.
+ * Note that the Comparable module is included
+ * so the <tt>==</tt> method is defined in terms of <tt><=></tt>.
+ *
+ * # Represent a string of 'X' characters.
+ * class Xs
+ * include Comparable
+ * attr_accessor :length
+ * def initialize(n)
+ * @length = n
+ * end
+ * def succ
+ * Xs.new(@length + 1)
+ * end
+ * def <=>(other)
+ * @length <=> other.length
* end
- *
- * r = Xs.new(3)..Xs.new(6) #=> xxx..xxxxxx
- * r.to_a #=> [xxx, xxxx, xxxxx, xxxxxx]
- * r.member?(Xs.new(5)) #=> true
- *
- * In the previous code example, class <code>Xs</code> includes the
- * <code>Comparable</code> module. This is because
- * <code>Enumerable#member?</code> checks for equality using
- * <code>==</code>. Including <code>Comparable</code> ensures that the
- * <code>==</code> method is defined in terms of the <code><=></code>
- * method implemented in <code>Xs</code>.
- *
+ * def to_s
+ * sprintf "%2d #{inspect}", @length
+ * end
+ * def inspect
+ * 'X' * @length
+ * end
+ * end
+ *
+ * r = Xs.new(3)..Xs.new(6) #=> XXX..XXXXXX
+ * r.to_a #=> [XXX, XXXX, XXXXX, XXXXXX]
+ * r.include?(Xs.new(5)) #=> true
+ * r.include?(Xs.new(7)) #=> false
+ *
+ * == What's Here
+ *
+ * First, what's elsewhere. \Class \Range:
+ *
+ * - Inherits from {class Object}[Object.html#class-Object-label-What-27s+Here].
+ * - Includes {module Enumerable}[Enumerable.html#module-Enumerable-label-What-27s+Here],
+ * which provides dozens of additional methods.
+ *
+ * Here, class \Range provides methods that are useful for:
+ *
+ * - {Creating a Range}[#class-Range-label-Methods+for+Creating+a+Range]
+ * - {Querying}[#class-Range-label-Methods+for+Querying]
+ * - {Comparing}[#class-Range-label-Methods+for+Comparing]
+ * - {Iterating}[#class-Range-label-Methods+for+Iterating]
+ * - {Converting}[#class-Range-label-Methods+for+Converting]
+ *
+ * === Methods for Creating a \Range
+ *
+ * - ::new:: Returns a new range.
+ *
+ * === Methods for Querying
+ *
+ * - #begin:: Returns the begin value given for +self+.
+ * - #bsearch:: Returns an element from +self+ selected by a binary search.
+ * - #count:: Returns a count of elements in +self+.
+ * - #end:: Returns the end value given for +self+.
+ * - #exclude_end?:: Returns whether the end object is excluded.
+ * - #first:: Returns the first elements of +self+.
+ * - #hash:: Returns the integer hash code.
+ * - #last:: Returns the last elements of +self+.
+ * - #max:: Returns the maximum values in +self+.
+ * - #min:: Returns the minimum values in +self+.
+ * - #minmax:: Returns the minimum and maximum values in +self+.
+ * - #size:: Returns the count of elements in +self+.
+ *
+ * === Methods for Comparing
+ *
+ * - {#==}[#method-i-3D-3D]:: Returns whether a given object is equal to +self+
+ * (uses #==).
+ * - #===:: Returns whether the given object is between the begin and end values.
+ * - #cover?:: Returns whether a given object is within +self+.
+ * - #eql?:: Returns whether a given object is equal to +self+ (uses #eql?).
+ * - #include? (aliased as #member?):: Returns whether a given object
+ * is an element of +self+.
+ *
+ * === Methods for Iterating
+ *
+ * - #%:: Requires argument +n+; calls the block with each +n+-th element of +self+.
+ * - #each:: Calls the block with each element of +self+.
+ * - #step:: Takes optional argument +n+ (defaults to 1);
+ calls the block with each +n+-th element of +self+.
+ *
+ * === Methods for Converting
+ *
+ * - #inspect:: Returns a string representation of +self+ (uses #inspect).
+ * - #to_a (aliased as #entries):: Returns elements of +self+ in an array.
+ * - #to_s:: Returns a string representation of +self+ (uses #to_s).
+ *
*/
void
-Init_Range()
+Init_Range(void)
{
- rb_cRange = rb_define_class("Range", rb_cObject);
+ id_beg = rb_intern_const("begin");
+ id_end = rb_intern_const("end");
+ id_excl = rb_intern_const("excl");
+
+ rb_cRange = rb_struct_define_without_accessor(
+ "Range", rb_cObject, range_alloc,
+ "begin", "end", "excl", NULL);
+
rb_include_module(rb_cRange, rb_mEnumerable);
+ rb_marshal_define_compat(rb_cRange, rb_cObject, range_dumper, range_loader);
rb_define_method(rb_cRange, "initialize", range_initialize, -1);
+ rb_define_method(rb_cRange, "initialize_copy", range_initialize_copy, 1);
rb_define_method(rb_cRange, "==", range_eq, 1);
- rb_define_method(rb_cRange, "===", range_include, 1);
+ rb_define_method(rb_cRange, "===", range_eqq, 1);
rb_define_method(rb_cRange, "eql?", range_eql, 1);
rb_define_method(rb_cRange, "hash", range_hash, 0);
rb_define_method(rb_cRange, "each", range_each, 0);
rb_define_method(rb_cRange, "step", range_step, -1);
- rb_define_method(rb_cRange, "first", range_first, 0);
- rb_define_method(rb_cRange, "last", range_last, 0);
- rb_define_method(rb_cRange, "begin", range_first, 0);
- rb_define_method(rb_cRange, "end", range_last, 0);
+ rb_define_method(rb_cRange, "%", range_percent_step, 1);
+ rb_define_method(rb_cRange, "bsearch", range_bsearch, 0);
+ rb_define_method(rb_cRange, "begin", range_begin, 0);
+ rb_define_method(rb_cRange, "end", range_end, 0);
+ rb_define_method(rb_cRange, "first", range_first, -1);
+ rb_define_method(rb_cRange, "last", range_last, -1);
+ rb_define_method(rb_cRange, "min", range_min, -1);
+ rb_define_method(rb_cRange, "max", range_max, -1);
+ rb_define_method(rb_cRange, "minmax", range_minmax, 0);
+ rb_define_method(rb_cRange, "size", range_size, 0);
+ rb_define_method(rb_cRange, "to_a", range_to_a, 0);
+ rb_define_method(rb_cRange, "entries", range_to_a, 0);
rb_define_method(rb_cRange, "to_s", range_to_s, 0);
rb_define_method(rb_cRange, "inspect", range_inspect, 0);
@@ -666,10 +2355,6 @@ Init_Range()
rb_define_method(rb_cRange, "member?", range_include, 1);
rb_define_method(rb_cRange, "include?", range_include, 1);
-
- id_cmp = rb_intern("<=>");
- id_succ = rb_intern("succ");
- id_beg = rb_intern("begin");
- id_end = rb_intern("end");
- id_excl = rb_intern("excl");
+ rb_define_method(rb_cRange, "cover?", range_cover, 1);
+ rb_define_method(rb_cRange, "count", range_count, -1);
}
generated by cgit v1.2.3 (git 2.25.1) at 2026-06-04 22:38:49 +0000