diff options
| author | hallgren <hallgren@chalmers.se> | 2015-12-01 15:14:27 +0000 |
|---|---|---|
| committer | hallgren <hallgren@chalmers.se> | 2015-12-01 15:14:27 +0000 |
| commit | 5bb792be5e3416a2229d549d57f02b54829c470b (patch) | |
| tree | b5ec6bcfbbc289a4670a125f0afdec116c011e2b /src/compiler/GF/Data/Str.hs | |
| parent | d6ae5e811b7d61ab714b2cab1437af2c350aefb6 (diff) | |
GF.Data.Str: change matchPrefix to agree with the GF book and the run-time system
The matchPrefix function is used in str2strings and the partial evaluator to
compute pre{...} tokens. But unlike the description in the GF book and
the implementation in the run-time system, matchPrefix looked at
the concatenation(!) of all following tokens and not just the next token
when deciding how to compute a pre{...} token.
This is a backwards incompatible change, but it is subtle and probably won't
cause any problems. In particular, the example grammars are unaffected.
Diffstat (limited to 'src/compiler/GF/Data/Str.hs')
| -rw-r--r-- | src/compiler/GF/Data/Str.hs | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/compiler/GF/Data/Str.hs b/src/compiler/GF/Data/Str.hs index 7b79add0a..7f1f4db75 100644 --- a/src/compiler/GF/Data/Str.hs +++ b/src/compiler/GF/Data/Str.hs @@ -44,8 +44,8 @@ type Ss = [String] -- matching functions in both ways matchPrefix :: Ss -> [(Ss,[String])] -> [String] -> Ss -matchPrefix s vs t = - head $ [u | let t' = concat (unmarkup t), +matchPrefix s vs t = + head $ [u | t':_ <- [unmarkup t], (u,as) <- vs, any (`isPrefixOf` t') as] ++ [s] |