/
range.fs
executable file
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/
range.fs
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// Copyright (c) Microsoft Open Technologies, Inc. All Rights Reserved. Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
/// Anything to do with special names of identifiers and other lexical rules
module (*internal*) Microsoft.FSharp.Compiler.Range
open System.IO
open System.Collections.Generic
open Microsoft.FSharp.Core.Printf
open Internal.Utilities
open Microsoft.FSharp.Compiler.AbstractIL
open Microsoft.FSharp.Compiler.AbstractIL.Internal
open Microsoft.FSharp.Compiler.AbstractIL.Internal.Library
open Microsoft.FSharp.Compiler
open Microsoft.FSharp.Compiler.Lib
open Microsoft.FSharp.Compiler.Lib.Bits
type FileIndex = int32
[<Literal>]
let columnBitCount = 9
[<Literal>]
let lineBitCount = 16
let posBitCount = lineBitCount + columnBitCount
let _ = assert (posBitCount <= 32)
let posColumnMask = mask32 0 columnBitCount
let lineColumnMask = mask32 columnBitCount lineBitCount
let inline (lsr) (x:int) (y:int) = int32 (uint32 x >>> y)
[<Struct; CustomEquality; NoComparison>]
[<System.Diagnostics.DebuggerDisplay("{Line},{Column}")>]
type pos(code:int32) =
new (l,c) =
let l = max 0 l
let c = max 0 c
let p = ( c &&& posColumnMask)
||| ((l <<< columnBitCount) &&& lineColumnMask)
pos p
member p.Line = (code lsr columnBitCount)
member p.Column = (code &&& posColumnMask)
member r.Encoding = code
static member EncodingSize = posBitCount
static member Decode (code:int32) : pos = pos code
override p.Equals(obj) = match obj with :? pos as p2 -> code = p2.Encoding | _ -> false
override p.GetHashCode() = hash code
[<Literal>]
let fileIndexBitCount = 14
[<Literal>]
let startLineBitCount = lineBitCount
[<Literal>]
let startColumnBitCount = columnBitCount
[<Literal>]
let heightBitCount = 15 // If necessary, could probably deduct one or two bits here without ill effect.
[<Literal>]
let endColumnBitCount = columnBitCount
[<Literal>]
let isSyntheticBitCount = 1
#if DEBUG
let _ = assert (fileIndexBitCount + startLineBitCount + startColumnBitCount + heightBitCount + endColumnBitCount + isSyntheticBitCount = 64)
#endif
[<Literal>]
let fileIndexShift = 0
[<Literal>]
let startLineShift = 14
[<Literal>]
let startColumnShift = 30
[<Literal>]
let heightShift = 39
[<Literal>]
let endColumnShift = 54
[<Literal>]
let isSyntheticShift = 63
[<Literal>]
let fileIndexMask = 0b0000000000000000000000000000000000000000000000000011111111111111L
[<Literal>]
let startLineMask = 0b0000000000000000000000000000000000111111111111111100000000000000L
[<Literal>]
let startColumnMask = 0b0000000000000000000000000111111111000000000000000000000000000000L
[<Literal>]
let heightMask = 0b0000000000111111111111111000000000000000000000000000000000000000L
[<Literal>]
let endColumnMask = 0b0111111111000000000000000000000000000000000000000000000000000000L
[<Literal>]
let isSyntheticMask = 0b1000000000000000000000000000000000000000000000000000000000000000L
#if DEBUG
let _ = assert (startLineShift = fileIndexShift + fileIndexBitCount)
let _ = assert (startColumnShift = startLineShift + startLineBitCount)
let _ = assert (heightShift = startColumnShift + startColumnBitCount)
let _ = assert (endColumnShift = heightShift + heightBitCount)
let _ = assert (isSyntheticShift = endColumnShift + endColumnBitCount)
let _ = assert (fileIndexMask = mask64 0 fileIndexBitCount)
let _ = assert (startLineMask = mask64 startLineShift startLineBitCount)
let _ = assert (startColumnMask = mask64 startColumnShift startColumnBitCount)
let _ = assert (heightMask = mask64 heightShift heightBitCount)
let _ = assert (endColumnMask = mask64 endColumnShift endColumnBitCount)
let _ = assert (isSyntheticMask = mask64 isSyntheticShift isSyntheticBitCount)
#endif
// This is just a standard unique-index table
type FileIndexTable() =
let indexToFileTable = new ResizeArray<_>(11)
let fileToIndexTable = new Dictionary<string,int>(11)
member t.FileToIndex f =
let mutable res = 0
let ok = fileToIndexTable.TryGetValue(f,&res)
if ok then res
else
lock fileToIndexTable (fun () ->
let mutable res = 0 in
let ok = fileToIndexTable.TryGetValue(f,&res) in
if ok then res
else
let n = indexToFileTable.Count in
indexToFileTable.Add(f)
fileToIndexTable.[f] <- n
n)
member t.IndexToFile n =
(if n < 0 then failwithf "fileOfFileIndex: negative argument: n = %d\n" n)
(if n >= indexToFileTable.Count then failwithf "fileOfFileIndex: invalid argument: n = %d\n" n)
indexToFileTable.[n]
let maxFileIndex = pown32 fileIndexBitCount
// ++GLOBAL MUTBALE STATE
// WARNING: Global Mutable State, holding a mapping between integers and filenames
let fileIndexTable = new FileIndexTable()
// Note if we exceed the maximum number of files we'll start to report incorrect file names
let fileIndexOfFile f = fileIndexTable.FileToIndex(f) % maxFileIndex
let fileOfFileIndex n = fileIndexTable.IndexToFile(n)
let mkPos l c = pos (l,c)
[<Struct; CustomEquality; NoComparison>]
[<System.Diagnostics.DebuggerDisplay("({StartLine},{StartColumn}-{EndLine},{EndColumn}) {FileName} IsSynthetic={IsSynthetic}")>]
type range(code:int64) =
static member Zero = range(0L)
new (fidx,bl,bc,el,ec) =
range( int64 fidx
||| (int64 bl <<< startLineShift)
||| (int64 bc <<< startColumnShift)
||| (int64 (el-bl) <<< heightShift)
||| (int64 ec <<< endColumnShift) )
new (fidx, b:pos, e:pos) = range(fidx,b.Line,b.Column,e.Line,e.Column)
member r.StartLine = int32((code &&& startLineMask) >>> startLineShift)
member r.StartColumn = int32((code &&& startColumnMask) >>> startColumnShift)
member r.EndLine = int32((code &&& heightMask) >>> heightShift) + r.StartLine
member r.EndColumn = int32((code &&& endColumnMask) >>> endColumnShift)
member r.IsSynthetic = int32((code &&& isSyntheticMask) >>> isSyntheticShift) <> 0
member r.Start = pos (r.StartLine, r.StartColumn)
member r.End = pos (r.EndLine, r.EndColumn)
member r.FileIndex = int32(code &&& fileIndexMask)
member m.StartRange = range (m.FileIndex, m.Start, m.Start)
member m.EndRange = range (m.FileIndex, m.End, m.End)
member r.FileName = fileOfFileIndex r.FileIndex
member r.MakeSynthetic() = range(code ||| isSyntheticMask)
override r.ToString() = sprintf "%s (%d,%d--%d,%d) IsSynthetic=%b" r.FileName r.StartLine r.StartColumn r.EndLine r.EndColumn r.IsSynthetic
member r.ToShortString() = sprintf "(%d,%d--%d,%d)" r.StartLine r.StartColumn r.EndLine r.EndColumn
member r.Code = code
override r.Equals(obj) = match obj with :? range as r2 -> code = r2.Code | _ -> false
override r.GetHashCode() = hash code
let mkRange f b e = range (fileIndexOfFile f, b, e)
let mkFileIndexRange fi b e = range (fi, b, e)
(* end representation, start derived ops *)
let posOrder = Order.orderOn (fun (p:pos) -> p.Line, p.Column) (Pair.order (Int32.order,Int32.order))
(* rangeOrder: not a total order, but enough to sort on ranges *)
let rangeOrder = Order.orderOn (fun (r:range) -> r.FileName, r.Start) (Pair.order (String.order,posOrder))
let outputPos (os:TextWriter) (m:pos) = fprintf os "(%d,%d)" m.Line m.Column
let outputRange (os:TextWriter) (m:range) = fprintf os "%s%a-%a" m.FileName outputPos m.Start outputPos m.End
let boutputPos os (m:pos) = bprintf os "(%d,%d)" m.Line m.Column
let boutputRange os (m:range) = bprintf os "%s%a-%a" m.FileName boutputPos m.Start boutputPos m.End
let posGt (p1:pos) (p2:pos) = (p1.Line > p2.Line || (p1.Line = p2.Line && p1.Column > p2.Column))
let posEq (p1:pos) (p2:pos) = (p1.Line = p2.Line && p1.Column = p2.Column)
let posGeq p1 p2 = posEq p1 p2 || posGt p1 p2
let posLt p1 p2 = posGt p2 p1
// Note, this is deliberately written in an allocation-free way, i.e. m1.Start, m1.End etc. are not called
let unionRanges (m1:range) (m2:range) =
if m1.FileIndex <> m2.FileIndex then m2 else
let b =
if (m1.StartLine > m2.StartLine || (m1.StartLine = m2.StartLine && m1.StartColumn > m2.StartColumn)) then m2
else m1
let e =
if (m1.EndLine > m2.EndLine || (m1.EndLine = m2.EndLine && m1.EndColumn > m2.EndColumn)) then m1
else m2
range (m1.FileIndex, b.StartLine, b.StartColumn, e.EndLine, e.EndColumn)
let rangeContainsRange (m1:range) (m2:range) =
m1.FileIndex = m2.FileIndex &&
posGeq m2.Start m1.Start &&
posGeq m1.End m2.End
let rangeContainsPos (m1:range) p =
posGeq p m1.Start &&
posGeq m1.End p
let rangeBeforePos (m1:range) p =
posGeq p m1.End
let rangeN filename line = mkRange filename (mkPos line 0) (mkPos line 80)
let pos0 = mkPos 1 0
let range0 = rangeN "unknown" 1
let rangeStartup = rangeN "startup" 1
let rangeCmdArgs = rangeN "commandLineArgs" 0
let trimRangeToLine (r:range) =
let startL,startC = r.StartLine,r.StartColumn
let endL ,_endC = r.EndLine,r.EndColumn
if endL <= startL then
r
else
let endL,endC = startL+1,0 (* Trim to the start of the next line (we do not know the end of the current line) *)
range (r.FileIndex, startL, startC, endL, endC)
(* For Diagnostics *)
let stringOfPos (pos:pos) = sprintf "(%d,%d)" pos.Line pos.Column
let stringOfRange (r:range) = sprintf "%s%s-%s" r.FileName (stringOfPos r.Start) (stringOfPos r.End)
#if CHECK_LINE0_TYPES // turn on to check that we correctly transform zero-based line counts to one-based line counts
// Visual Studio uses line counts starting at 0, F# uses them starting at 1
[<Measure>] type ZeroBasedLineAnnotation
type Line0 = int<ZeroBasedLineAnnotation>
#else
type Line0 = int
#endif
type Pos01 = Line0 * int
type Range01 = Pos01 * Pos01
module Line =
// Visual Studio uses line counts starting at 0, F# uses them starting at 1
let fromZ (line:Line0) = int line+1
let toZ (line:int) : Line0 = LanguagePrimitives.Int32WithMeasure(line - 1)
module Pos =
let fromZ (line:Line0) idx = mkPos (Line.fromZ line) idx
let toZ (p:pos) = (Line.toZ p.Line, p.Column)
module Range =
let toZ (m:range) = Pos.toZ m.Start, Pos.toZ m.End
let toFileZ (m:range) = m.FileName, toZ m