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Return a slice of the source.

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This commit is contained in:
Rob Rix 2017-04-21 13:31:40 -04:00
parent fdde8b0255
commit 94452afacc
1 changed files with 4 additions and 3 deletions
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7
src/Data/Syntax/Assignment.hs
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@ -23,7 +23,8 @@ import Data.Record
import Data.Text (unpack)
import qualified Info
import Prologue hiding (Alt, get)
import Source (Source())
import Range (offsetRange)
import Source (Source(), slice, sourceText)
import Text.Parser.TreeSitter.Language
import Text.Show hiding (show)
@ -102,9 +103,9 @@ runAssignment :: (Symbol grammar, Eq grammar, Show grammar) => Assignment (Node
runAssignment = iterFreer (\ assignment yield offset source nodes -> case (assignment, dropAnonymous nodes) of
-- Nullability: some rules, e.g. 'pure a' and 'many a', should match at the end of input. Either side of an alternation may be nullable, ergo Alt can match at the end of input.
(Alt a b, nodes) -> yield a offset source nodes <|> yield b offset source nodes -- FIXME: Symbol `Alt` Symbol `Alt` Symbol is inefficient, should build and match against an IntMap instead.
(assignment, subtree@(Rose node children) : rest) -> case assignment of
(assignment, subtree@(Rose node@(_ :. range :. _) children) : rest) -> case assignment of
Get -> yield node offset source nodes
Source -> yield "" offset source rest
Source -> yield (sourceText (slice (offsetRange range offset) source)) offset source rest
Children childAssignment -> do
c <- assignAllFrom childAssignment offset source children
yield c offset source rest