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Ranges (ie: for (int a in 0..<count) for (int i in 1…10))

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This commit is contained in:
Brian Fiete 2021-07-21 07:48:37 -07:00
parent e561a26695
commit 465050b81d
11 changed files with 418 additions and 18 deletions
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271
BeefLibs/corlib/src/Range.bf Normal file
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@ -0,0 +1,271 @@
using System.Collections;
using System.Diagnostics;
namespace System
{
interface RangeExpression
{
}
struct Range : RangeExpression, IEnumerable<int>
{
protected int mStart;
protected int mEnd;
public this()
{
mStart = 0;
mEnd = 0;
}
[Inline]
public this(int start, int end)
{
Debug.Assert(end >= start);
mStart = start;
mEnd = end;
}
public int Length
{
[Inline]
get
{
return mEnd - mStart;
}
[Inline]
set mut
{
mEnd = mStart + value;
}
}
public int Start
{
[Inline]
get
{
return mStart;
}
[Inline]
set mut
{
mStart = value;
}
}
public int End
{
[Inline]
get
{
return mEnd;
}
set mut
{
mEnd = value;
}
}
public bool IsEmpty
{
[Inline]
get
{
return mEnd == mStart;
}
}
public bool Contains(int idx)
{
return (idx >= mStart) && (idx < mStart);
}
public void Clear() mut
{
mStart = 0;
mEnd = 0;
}
[Inline]
public Enumerator GetEnumerator()
{
return Enumerator(this);
}
public override void ToString(String strBuffer)
{
strBuffer.AppendF($"{mStart}..<{mEnd}");
}
public struct Enumerator : IEnumerator<int>
{
private int mEnd;
private int mIndex;
[Inline]
public this(Range range)
{
mIndex = range.mStart - 1;
mEnd = range.mEnd;
}
public void Dispose()
{
}
public ref int Index
{
get mut
{
return ref mIndex;
}
}
public int End => mEnd;
[Inline]
public Result<int> GetNext() mut
{
if (mIndex + 1 >= mEnd)
return .Err;
return ++mIndex;
}
}
}
struct ClosedRange : RangeExpression, IEnumerable<int>
{
protected int mStart;
protected int mEnd;
public this()
{
mStart = 0;
mEnd = 0;
}
[Inline]
public this(int start, int end)
{
Debug.Assert(end >= start);
mStart = start;
mEnd = end;
}
public int Length
{
[Inline]
get
{
return mEnd - mStart;
}
[Inline]
set mut
{
mEnd = mStart + value;
}
}
public int Start
{
[Inline]
get
{
return mStart;
}
[Inline]
set mut
{
mStart = value;
}
}
public int End
{
[Inline]
get
{
return mEnd;
}
set mut
{
mEnd = value;
}
}
public bool IsEmpty
{
[Inline]
get
{
return mEnd == mStart;
}
}
public bool Contains(int idx)
{
return (idx >= mStart) && (idx < mStart);
}
public void Clear() mut
{
mStart = 0;
mEnd = 0;
}
[Inline]
public Enumerator GetEnumerator()
{
return Enumerator(this);
}
public override void ToString(String strBuffer)
{
strBuffer.AppendF($"{mStart}...{mEnd}");
}
public struct Enumerator : IEnumerator<int>
{
private int mEnd;
private int mIndex;
[Inline]
public this(ClosedRange range)
{
mIndex = range.mStart - 1;
mEnd = range.mEnd;
}
public void Dispose()
{
}
public ref int Index
{
get mut
{
return ref mIndex;
}
}
public int End => mEnd;
[Inline]
public Result<int> GetNext() mut
{
if (mIndex >= mEnd)
return .Err;
return ++mIndex;
}
}
}
}