Safe Haskell	None
Language	Haskell98

SrcLoc

Contents

SrcLoc
- Constructing SrcLoc
- Unsafely deconstructing SrcLoc
SrcSpan
Located

Description

This module contains types that relate to the positions of things in source files, and allow tagging of those things with locations

Synopsis

SrcLoc

data RealSrcLoc Source

Represents a single point within a file

Instances

Eq RealSrcLoc
Ord RealSrcLoc
Show RealSrcLoc
Outputable RealSrcLoc

data SrcLoc Source

Constructors

RealSrcLoc !RealSrcLoc
UnhelpfulLoc FastString

Instances

Eq SrcLoc
Ord SrcLoc
Outputable SrcLoc

Constructing SrcLoc

mkSrcLoc :: FastString -> Int -> Int -> SrcLoc Source

mkRealSrcLoc :: FastString -> Int -> Int -> RealSrcLoc Source

mkGeneralSrcLoc :: FastString -> SrcLoc Source

Creates a "bad" SrcLoc that has no detailed information about its location

noSrcLoc :: SrcLoc Source

Built-in "bad" SrcLoc values for particular locations

generatedSrcLoc :: SrcLoc Source

Built-in "bad" SrcLoc values for particular locations

interactiveSrcLoc :: SrcLoc Source

Built-in "bad" SrcLoc values for particular locations

advanceSrcLoc :: RealSrcLoc -> Char -> RealSrcLoc Source

Move the SrcLoc down by one line if the character is a newline, to the next 8-char tabstop if it is a tab, and across by one character in any other case

Unsafely deconstructing SrcLoc

srcLocFile :: RealSrcLoc -> FastString Source

Gives the filename of the RealSrcLoc

srcLocLine :: RealSrcLoc -> Int Source

Raises an error when used on a "bad" SrcLoc

srcLocCol :: RealSrcLoc -> Int Source

Raises an error when used on a "bad" SrcLoc

SrcSpan

data RealSrcSpan Source

A SrcSpan delimits a portion of a text file. It could be represented by a pair of (line,column) coordinates, but in fact we optimise slightly by using more compact representations for single-line and zero-length spans, both of which are quite common.

The end position is defined to be the column after the end of the span. That is, a span of (1,1)-(1,2) is one character long, and a span of (1,1)-(1,1) is zero characters long.

Instances

Eq RealSrcSpan
Data RealSrcSpan
Show RealSrcSpan
Outputable RealSrcSpan
Typeable * RealSrcSpan

data SrcSpan Source

Constructors

RealSrcSpan !RealSrcSpan
UnhelpfulSpan !FastString

Instances

Eq SrcSpan
Data SrcSpan
Ord SrcSpan
Show SrcSpan
Outputable SrcSpan
Typeable * SrcSpan

Constructing SrcSpan

mkGeneralSrcSpan :: FastString -> SrcSpan Source

Create a "bad" SrcSpan that has not location information

mkSrcSpan :: SrcLoc -> SrcLoc -> SrcSpan Source

Create a SrcSpan between two points in a file

mkRealSrcSpan :: RealSrcLoc -> RealSrcLoc -> RealSrcSpan Source

Create a SrcSpan between two points in a file

noSrcSpan :: SrcSpan Source

Built-in "bad" SrcSpans for common sources of location uncertainty

wiredInSrcSpan :: SrcSpan Source

Built-in "bad" SrcSpans for common sources of location uncertainty

srcLocSpan :: SrcLoc -> SrcSpan Source

Create a SrcSpan corresponding to a single point

realSrcLocSpan :: RealSrcLoc -> RealSrcSpan Source

combineSrcSpans :: SrcSpan -> SrcSpan -> SrcSpan Source

Combines two SrcSpan into one that spans at least all the characters within both spans. Assumes the "file" part is the same in both inputs

Deconstructing SrcSpan

srcSpanStart :: SrcSpan -> SrcLoc Source

Returns the location at the start of the SrcSpan or a "bad" SrcSpan if that is unavailable

srcSpanEnd :: SrcSpan -> SrcLoc Source

Returns the location at the end of the SrcSpan or a "bad" SrcSpan if that is unavailable

realSrcSpanStart :: RealSrcSpan -> RealSrcLoc Source

realSrcSpanEnd :: RealSrcSpan -> RealSrcLoc Source

srcSpanFileName_maybe :: SrcSpan -> Maybe FastString Source

Obtains the filename for a SrcSpan if it is "good"

showUserSpan :: Bool -> SrcSpan -> String Source

Unsafely deconstructing SrcSpan

srcSpanFile :: RealSrcSpan -> FastString Source

srcSpanStartLine :: RealSrcSpan -> Int Source

srcSpanEndLine :: RealSrcSpan -> Int Source

srcSpanStartCol :: RealSrcSpan -> Int Source

srcSpanEndCol :: RealSrcSpan -> Int Source

Predicates on SrcSpan

isGoodSrcSpan :: SrcSpan -> Bool Source

Test if a SrcSpan is "good", i.e. has precise location information

isOneLineSpan :: SrcSpan -> Bool Source

True if the span is known to straddle only one line. For "bad" SrcSpan, it returns False

Located

type Located e = GenLocated SrcSpan eSource

type RealLocated e = GenLocated RealSrcSpan eSource

data GenLocated l eSource

We attach SrcSpans to lots of things, so let's have a datatype for it.

Constructors

L l e

Instances

Functor (GenLocated l)
(Eq l, Eq e) => Eq (GenLocated l e)
(Data l, Data e) => Data (GenLocated l e)
(Ord l, Ord e) => Ord (GenLocated l e)
(Outputable l, Outputable e) => Outputable (GenLocated l e)
Typeable (* -> * -> *) GenLocated