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-rw-r--r--src/Codec/Pesto/Lint.lhs27
1 files changed, 27 insertions, 0 deletions
diff --git a/src/Codec/Pesto/Lint.lhs b/src/Codec/Pesto/Lint.lhs
index e398c09..1cce87c 100644
--- a/src/Codec/Pesto/Lint.lhs
+++ b/src/Codec/Pesto/Lint.lhs
@@ -281,6 +281,30 @@ should we allow this? it does not make sense imo
- reject loops
- reject multiple results/alternatives with the same name
+Ranges
+++++++
+
+The first amount of a range ratio must be strictly smaller than the second.
+This limitation is not enforced for ranges containing strings.
+
+> rangeFromLargerThanTo nodes edges = foldl f [] nodes
+> where
+> f xs n@(nodeid, Ingredient q) | not $ rangeOk q =
+> LintResult RangeFromLargerThanTo [nodeid]:xs
+> f xs n@(nodeid, Reference q) | not $ rangeOk q =
+> LintResult RangeFromLargerThanTo [nodeid]:xs
+> f xs _ = xs
+> rangeOk (Quantity (Range (AmountRatio a) (AmountRatio b)) _ _) = a < b
+> rangeOk _ = True
+
+> testRangeFromLargerThanTo = [
+> cmpLint "+2-3 l water >bar" []
+> , cmpLint "+3-2 l water >bar" [LintResult RangeFromLargerThanTo [0]]
+> , cmpLint "+2/3-1/3 l water >bar" [LintResult RangeFromLargerThanTo [0]]
+> , cmpLint "+some-many _ eggs >bar" []
+> , cmpLint "+1-\"a few\" _ eggs >bar" []
+> ]
+
Appendix
++++++++
@@ -297,6 +321,7 @@ Appendix
> | UnknownMetadataKey
> | InvalidMetadata
> | InvalidNode
+> | RangeFromLargerThanTo
> deriving (Show, Eq, Ord)
> lintTests = [
@@ -308,6 +333,7 @@ Appendix
> , timeAnnotatesAction
> , wellKnownUnit
> , rootAnnotations
+> , rangeFromLargerThanTo
> ]
> cmpLint doc expect = doc ~: sort (lint nodes edges) ~?= sort expect
@@ -325,5 +351,6 @@ Appendix
> , testTimeAnnotatesAction
> , testLintTwoAlternatives
> , testLintResultNonempty
+> , testRangeFromLargerThanTo
> ]