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| author |  Adam Chlipala <adamc@hcoop.net> | 2010-06-03 13:04:37 -0400 |
|---|---|---|
| committer | Adam Chlipala <adamc@hcoop.net> | 2010-06-03 13:04:37 -0400 |
| commit | 63f77395df8d7e78c21437876ce585b01517f0cc (patch) | |
| tree | 370066a96da7c7aff61371c96f82804cde02fa75 /lib/ur/string.ur | |
| parent | 4c67cd1d61cb79224bbe90dbdb229e0d9b58d3c9 (diff) | |
Some serious bug-fix work to get HTML example to compile; this includes fixing a bug with 'val' patterns in Unnest and the need for more local reduction in Especialize
Diffstat (limited to 'lib/ur/string.ur')
| -rw-r--r-- | lib/ur/string.ur | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/lib/ur/string.ur b/lib/ur/string.ur index f19ce174..f7781e01 100644 --- a/lib/ur/string.ur +++ b/lib/ur/string.ur @@ -11,7 +11,15 @@ val suffix = Basis.strsuffix val index = Basis.strindex val atFirst = Basis.strchr -fun mindex {Haystack = s, Needle = chs} = Basis.strcspn s chs +fun mindex {Haystack = s, Needle = chs} = + let + val n = Basis.strcspn s chs + in + if n >= length s then + None + else + Some n + end fun substring s {Start = start, Len = len} = Basis.substring s start len |