#1803: Include qCurrentLoc in the Quasi class
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Reporter: guest | Owner:
Type: feature request | Status: closed
Priority: normal | Milestone: _|_
Component: Template Haskell | Version: 6.6.1
Resolution: fixed | Keywords:
Testcase: | Blockedby:
Difficulty: Unknown | Os: Unknown/Multiple
Blocking: | Architecture: Unknown/Multiple
Failure: None/Unknown |
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Changes (by reinerp):
* status: new => closed
* failure: => None/Unknown
* resolution: => fixed
Comment:
This was implemented when quasi-quotation was introduced:
{{{
commit 3202618f6aefdd0921b4e8e94754cef7ddda720f
Author: [email protected] <unknown>
Date: Fri Jan 18 15:10:16 2008 +0000
Support code for quasi-quotation feature
This patch supports the quasi-quotation feature. Here's the relevant
parts from the message in the big compiler patch:
Fri Jan 18 14:55:03 GMT 2008 [email protected]
* Add quasi-quotation, courtesy of Geoffrey Mainland
This patch adds quasi-quotation, as described in
"Nice to be Quoted: Quasiquoting for Haskell"
(Geoffrey Mainland, Haskell Workshop 2007)
Implemented by Geoffrey and polished by Simon.
...snip...
* There is an accompanying patch to the template-haskell library.
This
involves one interface change:
currentModule :: Q String
is replaced by
location :: Q Loc
where Loc is a data type defined in TH.Syntax thus:
data Loc
= Loc { loc_filename :: String
, loc_package :: String
, loc_module :: String
, loc_start :: CharPos
, loc_end :: CharPos }
type CharPos = (Int, Int) -- Line and character position
So you get a lot more info from 'location' than from
'currentModule'.
The location you get is the location of the splice.
This works in Template Haskell too of course, and lets a TH
program
generate much better error messages.
* There's also a new module in the template-haskell package called
Language.Haskell.TH.Quote, which contains support code for the
quasi-quoting feature.
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1803#comment:7>
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