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ruby--ruby/range.c
Jeremy Evans 8900a25581
Fix Range#{max,minmax} for range with integer beginning and non-integer end 
Previously, for inclusive ranges, the max would show up as the
end of the range, even though the end was not an integer and would
not be the maximum value.  For exclusive ranges, max/minmax would
previously raise a TypeError, even though it is possible to get the
correct maximum.

This change to max/minmax also uncovered a similar error in cover?,
which calls max in certain cases, so adjust the code there so that
cover? still works as expected.

Fixes [Bug #17017]
2020-07-13 10:09:38 -07:00

1844 lines
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/**********************************************************************
range.c -
$Author$
created at: Thu Aug 19 17:46:47 JST 1993
Copyright (C) 1993-2007 Yukihiro Matsumoto
**********************************************************************/
#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_beg, id_end, id_excl;
#define id_cmp idCmp
#define id_succ idSucc
#define id_min idMin
#define id_max idMax
static VALUE r_cover_p(VALUE, VALUE, VALUE, VALUE);
#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))
#define RBOOL(v) ((v) ? Qtrue : Qfalse)
#define EXCL(r) RTEST(RANGE_EXCL(r))
static void
range_init(VALUE range, VALUE beg, VALUE end, VALUE exclude_end)
{
if ((!FIXNUM_P(beg) || !FIXNUM_P(end)) && !NIL_P(beg) && !NIL_P(end)) {
VALUE v;
v = rb_funcall(beg, id_cmp, 1, end);
if (NIL_P(v))
rb_raise(rb_eArgError, "bad value for range");
}
RANGE_SET_EXCL(range, exclude_end);
RANGE_SET_BEG(range, beg);
RANGE_SET_END(range, end);
}
VALUE
rb_range_new(VALUE beg, VALUE end, int exclude_end)
{
VALUE range = rb_obj_alloc(rb_cRange);
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(begin, end, exclude_end=false) -> rng
*
* Constructs a range using the given +begin+ and +end+. If the +exclude_end+
* parameter is omitted or is <code>false</code>, the range will include
* the end object; otherwise, it will be excluded.
*/
static VALUE
range_initialize(int argc, VALUE *argv, VALUE range)
{
VALUE beg, end, flags;
rb_scan_args(argc, argv, "21", &beg, &end, &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 the range excludes its end value.
*
* (1..5).exclude_end? #=> false
* (1...5).exclude_end? #=> true
*/
static VALUE
range_exclude_end_p(VALUE range)
{
return EXCL(range) ? Qtrue : Qfalse;
}
static VALUE
recursive_equal(VALUE range, VALUE obj, int recur)
{
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;
if (EXCL(range) != EXCL(obj))
return Qfalse;
return Qtrue;
}
/*
* call-seq:
* rng == obj -> true or false
*
* Returns <code>true</code> only if +obj+ is a Range, has equivalent
* begin and end items (by comparing them with <code>==</code>), and has
* the same #exclude_end? setting as the range.
*
* (0..2) == (0..2) #=> true
* (0..2) == Range.new(0,2) #=> true
* (0..2) == (0...2) #=> false
*
*/
static VALUE
range_eq(VALUE range, VALUE obj)
{
if (range == obj)
return Qtrue;
if (!rb_obj_is_kind_of(obj, rb_cRange))
return Qfalse;
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_less(VALUE a, VALUE b)
{
VALUE r = rb_funcall(a, id_cmp, 1, b);
if (NIL_P(r))
return INT_MAX;
return rb_cmpint(r, a, b);
}
static VALUE
recursive_eql(VALUE range, VALUE obj, int recur)
{
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 (EXCL(range) != EXCL(obj))
return Qfalse;
return Qtrue;
}
/*
* call-seq:
* rng.eql?(obj) -> true or false
*
* Returns <code>true</code> only if +obj+ is a Range, has equivalent
* begin and end items (by comparing them with <code>eql?</code>),
* and has the same #exclude_end? setting as the range.
*
* (0..2).eql?(0..2) #=> true
* (0..2).eql?(Range.new(0,2)) #=> true
* (0..2).eql?(0...2) #=> false
*
*/
static VALUE
range_eql(VALUE range, VALUE obj)
{
if (range == obj)
return Qtrue;
if (!rb_obj_is_kind_of(obj, rb_cRange))
return Qfalse;
return rb_exec_recursive_paired(recursive_eql, range, obj, obj);
}
/*
* call-seq:
* rng.hash -> integer
*
* Compute a hash-code for this range. Two ranges with equal
* begin and end points (using <code>eql?</code>), and the same
* #exclude_end? value will generate the same hash-code.
*
* See also Object#hash.
*/
static VALUE
range_hash(VALUE range)
{
st_index_t hash = EXCL(range);
VALUE v;
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);
return ST2FIX(hash);
}
static void
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_less(v, e) < 0) {
if ((*func)(v, arg)) break;
v = rb_funcallv(v, id_succ, 0, 0);
}
}
else {
while ((c = r_less(v, e)) <= 0) {
if ((*func)(v, arg)) break;
if (!c) break;
v = rb_funcallv(v, id_succ, 0, 0);
}
}
}
static int
sym_step_i(VALUE i, VALUE arg)
{
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)) {
rb_yield(rb_str_intern(i));
iter[0] = iter[1];
}
return 0;
}
static int
step_i(VALUE i, VALUE arg)
{
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)) {
rb_yield(i);
iter[0] = iter[1];
}
return 0;
}
static int
discrete_object_p(VALUE obj)
{
if (rb_obj_is_kind_of(obj, rb_cTime)) return FALSE; /* until Time#succ removed */
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;
}
/*
* Document-method: Range#step
* Document-method: Range#%
* call-seq:
* rng.step(n=1) {| obj | block } -> rng
* rng.step(n=1) -> an_enumerator
* rng.step(n=1) -> an_arithmetic_sequence
* rng % n -> an_enumerator
* rng % n -> an_arithmetic_sequence
*
* Iterates over the range, passing each <code>n</code>th element to the block.
* If begin and end are numeric, +n+ is added for each iteration.
* Otherwise #step invokes #succ to iterate through range elements.
*
* If no block is given, an enumerator is returned instead.
* Especially, the enumerator is an Enumerator::ArithmeticSequence
* if begin and end of the range are numeric.
*
* range = Xs.new(1)..Xs.new(10)
* range.step(2) {|x| puts x}
* puts
* 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
*
* See Range for the definition of class Xs.
*/
static VALUE
range_step(int argc, VALUE *argv, VALUE range)
{
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()) {
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);
}
step = check_step_domain(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, unit = FIX2LONG(step);
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 */
VALUE iter[2];
iter[0] = INT2FIX(1);
iter[1] = step;
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 {
tmp = rb_check_string_type(b);
if (!NIL_P(tmp)) {
VALUE iter[2];
b = tmp;
iter[0] = INT2FIX(1);
iter[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 {
VALUE args[2];
if (!discrete_object_p(b)) {
rb_raise(rb_eTypeError, "can't iterate from %s",
rb_obj_classname(b));
}
args[0] = INT2FIX(1);
args[1] = step;
range_each_func(range, step_i, (VALUE)args);
}
}
return range;
}
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 (v == Qfalse || v == Qnil) { \
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:
* rng.bsearch {|obj| block } -> value
*
* By using binary search, finds a value in range which meets the given
* condition in O(log n) where n is the size of the range.
*
* You can use this method in two use cases: a find-minimum mode and
* a find-any mode. In either case, the elements of the range must be
* monotone (or sorted) with respect to the block.
*
* In find-minimum mode (this is a good choice for typical use case),
* the block must return true or false, and there must be a value x
* so that:
*
* - the block returns false for any value which is less than x, and
* - the block returns true for any value which is greater than or
* equal to x.
*
* If x is within the range, this method returns the value x.
* Otherwise, it returns nil.
*
* ary = [0, 4, 7, 10, 12]
* (0...ary.size).bsearch {|i| ary[i] >= 4 } #=> 1
* (0...ary.size).bsearch {|i| ary[i] >= 6 } #=> 2
* (0...ary.size).bsearch {|i| ary[i] >= 8 } #=> 3
* (0...ary.size).bsearch {|i| ary[i] >= 100 } #=> nil
*
* (0.0...Float::INFINITY).bsearch {|x| Math.log(x) >= 0 } #=> 1.0
*
* In find-any mode (this behaves like libc's bsearch(3)), the block
* must return a number, and there must be two values x and y (x <= y)
* so that:
*
* - the block returns a positive number for v if v < x,
* - the block returns zero for v if x <= v < y, and
* - the block returns a negative number for v if y <= v.
*
* This method returns any value which is within the intersection of
* the given range and x...y (if any). If there is no value that
* satisfies the condition, it returns nil.
*
* ary = [0, 100, 100, 100, 200]
* (0..4).bsearch {|i| 100 - ary[i] } #=> 1, 2 or 3
* (0..4).bsearch {|i| 300 - ary[i] } #=> nil
* (0..4).bsearch {|i| 50 - ary[i] } #=> nil
*
* You must not mix the two modes at a time; the block must always
* return either true/false, or always return a number. It is
* undefined which value is actually picked up at each iteration.
*/
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_TYPE_P(beg, T_FLOAT) || RB_TYPE_P(end, T_FLOAT)) {
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)
{
rb_yield(rb_str_intern(v));
return 0;
}
/*
* call-seq:
* rng.size -> num
*
* Returns the number of elements in the range. Both the begin and the end of
* the Range must be Numeric, otherwise nil is returned.
*
* (10..20).size #=> 11
* ('a'..'z').size #=> nil
* (-Float::INFINITY..Float::INFINITY).size #=> Infinity
*/
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:
* rng.to_a -> array
* rng.entries -> array
*
* Returns an array containing the items in the range.
*
* (1..7).to_a #=> [1, 2, 3, 4, 5, 6, 7]
* (1..).to_a #=> RangeError: cannot convert endless range to an array
*/
static VALUE
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:
* rng.each {| i | block } -> rng
* rng.each -> an_enumerator
*
* Iterates over the elements of range, passing each in turn to the
* block.
*
* The +each+ method can only be used if the begin object of the range
* supports the +succ+ method. A TypeError is raised if the object
* does not have +succ+ method defined (like Float).
*
* If no block is given, an enumerator is returned instead.
*
* (10..15).each {|n| print n, ' ' }
* # prints: 10 11 12 13 14 15
*
* (2.5..5).each {|n| print n, ' ' }
* # raises: TypeError: can't iterate from Float
*/
static VALUE
range_each(VALUE range)
{
VALUE beg, end;
long i;
RETURN_SIZED_ENUMERATOR(range, 0, 0, range_enum_size);
beg = RANGE_BEG(range);
end = RANGE_END(range);
if (FIXNUM_P(beg) && NIL_P(end)) {
range_each_fixnum_endless(beg);
}
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 (!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);
}
}
return range;
}
/*
* call-seq:
* rng.begin -> obj
*
* Returns the object that defines the beginning of the range.
*
* (1..10).begin #=> 1
*/
static VALUE
range_begin(VALUE range)
{
return RANGE_BEG(range);
}
/*
* call-seq:
* rng.end -> obj
*
* Returns the object that defines the end of the range.
*
* (1..10).end #=> 10
* (1...10).end #=> 10
*/
static VALUE
range_end(VALUE range)
{
return RANGE_END(range);
}
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:
* rng.first -> obj
* rng.first(n) -> an_array
*
* Returns the first object in the range, or an array of the first +n+
* elements.
*
* (10..20).first #=> 10
* (10..20).first(3) #=> [10, 11, 12]
*/
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 (FIXNUM_ZERO_P(len_1) || rb_num_negative_p(len_1)) {
return rb_ary_new_capa(0);
}
if (x) {
e = rb_int_minus(e, ONE);
len = len_1;
}
else {
len = rb_int_plus(len_1, ONE);
}
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.last -> obj
* rng.last(n) -> an_array
*
* Returns the last object in the range,
* or an array of the last +n+ elements.
*
* Note that with no arguments +last+ will return the object that defines
* the end of the range even if #exclude_end? is +true+.
*
* (10..20).last #=> 20
* (10...20).last #=> 20
* (10..20).last(3) #=> [18, 19, 20]
* (10...20).last(3) #=> [17, 18, 19]
*/
static VALUE
range_last(int argc, VALUE *argv, VALUE range)
{
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.min -> obj
* rng.min {| a,b | block } -> obj
* rng.min(n) -> array
* rng.min(n) {| a,b | block } -> array
*
* Returns the minimum value in the range. Returns +nil+ if the begin
* value of the range is larger than the end value. Returns +nil+ if
* the begin value of an exclusive range is equal to the end value.
*
* Can be given an optional block to override the default comparison
* method <code>a <=> b</code>.
*
* (10..20).min #=> 10
*/
static VALUE
range_min(int argc, VALUE *argv, VALUE range)
{
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;
}
}
/*
* call-seq:
* rng.max -> obj
* rng.max {| a,b | block } -> obj
* rng.max(n) -> obj
* rng.max(n) {| a,b | block } -> obj
*
* Returns the maximum value in the range. Returns +nil+ if the begin
* value of the range larger than the end value. Returns +nil+ if
* the begin value of an exclusive range is equal to the end value.
*
* Can be given an optional block to override the default comparison
* method <code>a <=> b</code>.
*
* (10..20).max #=> 20
*/
static VALUE
range_max(int argc, VALUE *argv, VALUE range)
{
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_block_given_p() || (EXCL(range) && !nm) || argc) {
if (NIL_P(RANGE_BEG(range))) {
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 };
VALUE b = RANGE_BEG(range);
int c = OPTIMIZED_CMP(b, e, cmp_opt);
if (c > 0)
return Qnil;
if (EXCL(range)) {
if (RB_INTEGER_TYPE_P(b) && !RB_INTEGER_TYPE_P(e)) {
VALUE end = e;
e = rb_funcall(e, rb_intern("floor"), 0);
if (!RTEST(rb_funcall(e, rb_intern("=="), 1, end))) {
return e;
}
}
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));
}
if (RB_INTEGER_TYPE_P(b) && !RB_INTEGER_TYPE_P(e)) {
e = rb_funcall(e, rb_intern("floor"), 0);
}
return e;
}
}
/*
* call-seq:
* rng.minmax -> [obj, obj]
* rng.minmax {| a,b | block } -> [obj, obj]
*
* Returns a two element array which contains the minimum and the
* maximum value in the range.
*
* Can be given an optional block to override the default comparison
* method <code>a <=> b</code>.
*/
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;
}
VALUE
rb_range_beg_len(VALUE range, long *begp, long *lenp, long len, int err)
{
long beg, end, origbeg, origend;
VALUE b, e;
int excl;
if (!rb_range_values(range, &b, &e, &excl))
return Qfalse;
beg = NIL_P(b) ? 0 : NUM2LONG(b);
end = NIL_P(e) ? -1 : NUM2LONG(e);
if (NIL_P(e)) excl = 0;
origbeg = beg;
origend = end;
if (beg < 0) {
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;
}
len = end - beg;
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",
origbeg, excl ? "." : "", origend);
}
return Qnil;
}
/*
* call-seq:
* rng.to_s -> string
*
* Convert this range object to a printable form (using #to_s to convert the
* begin and end objects).
*/
static VALUE
range_to_s(VALUE range)
{
VALUE str, str2;
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_append(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
*
* Convert this range object to a printable form (using #inspect to
* convert the begin and end objects).
*/
static VALUE
range_inspect(VALUE range)
{
return rb_exec_recursive(inspect_range, range, 0);
}
static VALUE range_include_internal(VALUE range, VALUE val, int string_use_cover);
/*
* call-seq:
* rng === obj -> true or false
*
* Returns <code>true</code> if +obj+ is between begin and end of range,
* <code>false</code> otherwise (same as #cover?). Conveniently,
* <code>===</code> is the comparison operator used by <code>case</code>
* statements.
*
* case 79
* when 1..50 then puts "low"
* when 51..75 then puts "medium"
* when 76..100 then puts "high"
* end
* # Prints "high"
*
* case "2.6.5"
* when ..."2.4" then puts "EOL"
* when "2.4"..."2.5" then puts "maintenance"
* when "2.5"..."2.7" then puts "stable"
* when "2.7".. then puts "upcoming"
* end
* # Prints "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.member?(obj) -> true or false
* rng.include?(obj) -> true or false
*
* Returns <code>true</code> if +obj+ is an element of
* the range, <code>false</code> otherwise.
*
* ("a".."z").include?("g") #=> true
* ("a".."z").include?("A") #=> false
* ("a".."z").include?("cc") #=> false
*
* If you need to ensure +obj+ is between +begin+ and +end+, use #cover?
*
* ("a".."z").cover?("cc") #=> true
*
* If begin and end are numeric, #include? behaves like #cover?
*
* (1..3).include?(1.5) # => true
*/
static VALUE
range_include(VALUE range, VALUE val)
{
VALUE ret = range_include_internal(range, val, 0);
if (ret != Qundef) return ret;
return rb_call_super(1, &val);
}
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;
if (rb_cmpint(r, val, end) <= 0) return Qtrue;
return Qfalse;
}
else if (NIL_P(end)) {
VALUE r = rb_funcall(beg, id_cmp, 1, val);
if (NIL_P(r)) return Qfalse;
if (rb_cmpint(r, beg, val) <= 0) return Qtrue;
return Qfalse;
}
}
return Qundef;
}
static int r_cover_range_p(VALUE range, VALUE beg, VALUE end, VALUE val);
/*
* call-seq:
* rng.cover?(obj) -> true or false
* rng.cover?(range) -> true or false
*
* Returns <code>true</code> if +obj+ is between the begin and end of
* the range.
*
* This tests <code>begin <= obj <= end</code> when #exclude_end? is +false+
* and <code>begin <= obj < end</code> when #exclude_end? is +true+.
*
* If called with a Range argument, returns <code>true</code> when the
* given range is covered by the receiver,
* by comparing the begin and end values. If the argument can be treated as
* a sequence, this method treats it that way. In the specific case of
* <code>(a..b).cover?(c...d)</code> with <code>a <= c && b < d</code>,
* the end of the sequence must be calculated, which may exhibit poor
* performance if <code>c</code> is non-numeric.
* Returns <code>false</code> if the begin value of the
* range is larger than the end value. Also returns +false+ if one of the
* internal calls to <code><=></code> returns +nil+ (indicating the objects
* are not comparable).
*
* ("a".."z").cover?("c") #=> true
* ("a".."z").cover?("5") #=> false
* ("a".."z").cover?("cc") #=> true
* ("a".."z").cover?(1) #=> false
* (1..5).cover?(2..3) #=> true
* (1..5).cover?(0..6) #=> false
* (1..5).cover?(1...6) #=> true
*/
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;
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;
}
if (RB_INTEGER_TYPE_P(val_beg) && RB_INTEGER_TYPE_P(beg) &&
RB_INTEGER_TYPE_P(val_end) != RB_INTEGER_TYPE_P(end)) {
val_max = val_end;
}
else {
val_max = rb_rescue2(r_call_max, val, 0, Qnil, rb_eTypeError, (VALUE)0);
if (val_max == Qnil) 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;
NEWOBJ_OF(m, struct RObject, rb_cObject, T_OBJECT | (RGENGC_WB_PROTECTED_OBJECT ? FL_WB_PROTECTED : 1));
v = (VALUE)m;
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);
}
/*
* call-seq:
* range.count -> int
* range.count(item) -> int
* range.count { |obj| block } -> int
*
* Identical to Enumerable#count, except it returns Infinity for endless
* ranges.
*
*/
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 represents an interval---a set of values with a
* beginning 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
* Range::new. Ranges constructed using <code>..</code>
* run from the beginning 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"]
*
* == Beginless/Endless Ranges
*
* A "beginless range" and "endless range" represents a semi-infinite
* range. Literal notation for a beginless range is:
*
* (..1)
* # or
* (...1)
*
* Literal notation for an endless range is:
*
* (1..)
* # or similarly
* (1...)
*
* Which is equivalent to
*
* (1..nil) # or similarly (1...nil)
* Range.new(1, nil) # or Range.new(1, nil, true)
*
* Beginless/endless ranges are useful, for example, for idiomatic
* slicing of arrays:
*
* [1, 2, 3, 4, 5][...2] # => [1, 2]
* [1, 2, 3, 4, 5][2...] # => [3, 4, 5]
*
* Some implementation details:
*
* * +begin+ of beginless range and +end+ of endless range are +nil+;
* * +each+ of beginless range raises an exception;
* * +each+ of endless range enumerates infinite sequence (may be
* useful in combination with Enumerable#take_while or similar
* methods);
* * <code>(1..)</code> and <code>(1...)</code> are not equal,
* although technically representing the same sequence.
*
* == Custom Objects in Ranges
*
* Ranges can be constructed using any objects that can be compared
* using the <code><=></code> operator.
* Methods that treat the range as a sequence (#each and methods inherited
* from Enumerable) expect the begin object to implement a
* <code>succ</code> method to return the next object in sequence.
* The #step and #include? methods require the begin
* object to implement <code>succ</code> or to be numeric.
*
* In the <code>Xs</code> class below both <code><=></code> and
* <code>succ</code> are implemented so <code>Xs</code> can be used
* to construct ranges. Note that the Comparable module is included
* so the <code>==</code> method is defined in terms of <code><=></code>.
*
* 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
* end
*
* An example of using <code>Xs</code> to construct a range:
*
* r = Xs.new(3)..Xs.new(6) #=> xxx..xxxxxx
* r.to_a #=> [xxx, xxxx, xxxxx, xxxxxx]
* r.member?(Xs.new(5)) #=> true
*
*/
void
Init_Range(void)
{
#undef rb_intern
#define rb_intern(str) rb_intern_const(str)
id_beg = rb_intern("begin");
id_end = rb_intern("end");
id_excl = rb_intern("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_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, "%", 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);
rb_define_method(rb_cRange, "exclude_end?", range_exclude_end_p, 0);
rb_define_method(rb_cRange, "member?", range_include, 1);
rb_define_method(rb_cRange, "include?", range_include, 1);
rb_define_method(rb_cRange, "cover?", range_cover, 1);
rb_define_method(rb_cRange, "count", range_count, -1);
}
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