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Fix Issue 17525 - std.algorithm.skipOver should have a single argument with pred version

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RazvanN7 2017-07-05 11:35:06 +03:00
parent 232380647b
commit 1d1b42f413
1 changed files with 29 additions and 4 deletions
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33
std/algorithm/searching.d
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@ -3894,7 +3894,8 @@ if (isInputRange!Range && !isInfinite!Range &&
/**
Skip over the initial portion of the first given range that matches the second
range, or do nothing if there is no match.
range, or if no second range is given skip over the elements that fullfil pred.
Do nothing if there is no match.
Params:
pred = The predicate that determines whether elements from each respective
@ -3905,9 +3906,9 @@ Params:
representing the initial segment of $(D r1) to skip over.
Returns:
true if the initial segment of $(D r1) matches $(D r2), and $(D r1) has been
advanced to the point past this segment; otherwise false, and $(D r1) is left
in its original position.
true if the initial segment of $(D r1) matches $(D r2) or $(D pred) evaluates to true,
and $(D r1) has been advanced to the point past this segment; otherwise false, and
$(D r1) is left in its original position.
*/
bool skipOver(R1, R2)(ref R1 r1, R2 r2)
if (isForwardRange!R1 && isInputRange!R2
@ -3953,6 +3954,20 @@ if (is(typeof(binaryFun!pred(r1.front, r2.front))) &&
return r2.empty;
}
/// Ditto
bool skipOver(alias pred, R)(ref R r1)
if (isForwardRange!R &&
ifTestable!(typeof(r1.front), unaryFun!pred))
{
if (r1.empty || !unaryFun!pred(r1.front))
return false;
do
r1.popFront();
while (!r1.empty && unaryFun!pred(r1.front));
return true;
}
///
@safe unittest
{
@ -3969,6 +3984,16 @@ if (is(typeof(binaryFun!pred(r1.front, r2.front))) &&
assert(r1 == ["abc", "def", "hij"]);
assert(skipOver!((a, b) => a.equal(b))(r1, r2));
assert(r1 == ["def", "hij"]);
import std.ascii : isWhite;
import std.range.primitives : empty;
auto s2 = "\t\tvalue";
auto s3 = "";
auto s4 = "\t\t\t";
assert(s2.skipOver!isWhite && s2 == "value");
assert(!s3.skipOver!isWhite);
assert(s4.skipOver!isWhite && s3.empty);
}
/**