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Account for dereferencing for numerical ops in [[ ]].

This commit is contained in:
Vidar Holen 2015-10-14 11:11:17 -07:00
parent 2488be7298
commit b9cb040128
1 changed files with 27 additions and 13 deletions
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40
ShellCheck/Analytics.hs
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@ -230,6 +230,7 @@ filterByAnnotation token =
any hasNum anns
where
hasNum (DisableComment ts) = num == ts
hasNum _ = False
shouldIgnoreFor _ (T_Include {}) = True -- Ignore included files
shouldIgnoreFor _ _ = False
parents = getParentTree token
@ -1128,9 +1129,9 @@ prop_checkNumberComparisons4 = verify checkNumberComparisons "[[ $foo > 2.72 ]]"
prop_checkNumberComparisons5 = verify checkNumberComparisons "[[ $foo -le 2.72 ]]"
prop_checkNumberComparisons6 = verify checkNumberComparisons "[[ 3.14 -eq $foo ]]"
prop_checkNumberComparisons7 = verifyNot checkNumberComparisons "[[ 3.14 == $foo ]]"
prop_checkNumberComparisons8 = verify checkNumberComparisons "[[ foo <= bar ]]"
prop_checkNumberComparisons8 = verify checkNumberComparisons "[ foo <= bar ]"
prop_checkNumberComparisons9 = verify checkNumberComparisons "[ foo \\>= bar ]"
prop_checkNumberComparisons11= verify checkNumberComparisons "[[ $foo -eq 'N' ]]"
prop_checkNumberComparisons11= verify checkNumberComparisons "[ $foo -eq 'N' ]"
prop_checkNumberComparisons12= verify checkNumberComparisons "[ x$foo -gt x${N} ]"
checkNumberComparisons params (TC_Binary id typ op lhs rhs) = do
if isNum lhs && not (isNonNum rhs)
@ -1152,7 +1153,8 @@ checkNumberComparisons params (TC_Binary id typ op lhs rhs) = do
when (op `elem` ["-lt", "-gt", "-le", "-ge", "-eq"]) $ do
mapM_ checkDecimals [lhs, rhs]
checkStrings [lhs, rhs]
when (typ == SingleBracket) $
checkStrings [lhs, rhs]
where
isLtGt = flip elem ["<", "\\<", ">", "\\>"]
@ -1172,8 +1174,8 @@ checkNumberComparisons params (TC_Binary id typ op lhs rhs) = do
return . not . all numChar $ s
numChar x = isDigit x || x `elem` "+-. "
stringError t = err (getId t) 2130 $
op ++ " is for integer comparisons. Use " ++ seqv op ++ " instead."
stringError t = err (getId t) 2170 $
"Numerical " ++ op ++ " does not dereference in [..]. Expand or use string operator."
isNum t =
case oversimplify t of
@ -1284,16 +1286,20 @@ checkGlobbedRegex _ _ = return ()
prop_checkConstantIfs1 = verify checkConstantIfs "[[ foo != bar ]]"
prop_checkConstantIfs2 = verify checkConstantIfs "[[ n -le 4 ]]"
prop_checkConstantIfs3 = verify checkConstantIfs "[[ $n -le 4 && n -ge 2 ]]"
prop_checkConstantIfs2a= verify checkConstantIfs "[ n -le 4 ]"
prop_checkConstantIfs2b= verifyNot checkConstantIfs "[[ n -le 4 ]]"
prop_checkConstantIfs3 = verify checkConstantIfs "[[ $n -le 4 && n != 2 ]]"
prop_checkConstantIfs4 = verifyNot checkConstantIfs "[[ $n -le 3 ]]"
prop_checkConstantIfs5 = verifyNot checkConstantIfs "[[ $n -le $n ]]"
checkConstantIfs _ (TC_Binary id typ op lhs rhs)
| op `elem` [ "==", "!=", "<=", ">=", "-eq", "-ne", "-lt", "-le", "-gt", "-ge", "=~", ">", "<", "="] =
when (isJust lLit && isJust rLit) $ warn id 2050 "This expression is constant. Did you forget the $ on a variable?"
where
lLit = getLiteralString lhs
rLit = getLiteralString rhs
checkConstantIfs _ (TC_Binary id typ op lhs rhs) | isStatic =
when (isJust lLit && isJust rLit) $
warn id 2050 "This expression is constant. Did you forget the $ on a variable?"
where
lLit = getLiteralString lhs
rLit = getLiteralString rhs
isStatic =
typ == SingleBracket ||
op `elem` [ "=", "==", "!=", "<=", ">=", "=~", ">", "<" ]
checkConstantIfs _ _ = return ()
prop_checkLiteralBreakingTest = verify checkLiteralBreakingTest "[[ a==$foo ]]"
@ -2376,6 +2382,10 @@ getReferencedVariables t =
TC_Unary id _ "-v" token -> getIfReference t token
TC_Unary id _ "-R" token -> getIfReference t token
TC_Binary id DoubleBracket op lhs rhs ->
if isDereferencing op
then concatMap (getIfReference t) [lhs, rhs]
else []
t@(T_FdRedirect _ ('{':var) op) -> -- {foo}>&- references and closes foo
[(t, t, takeWhile (/= '}') var) | isClosingFileOp op]
@ -2401,6 +2411,8 @@ getReferencedVariables t =
when (isDigit $ head str) $ fail "is a number"
return (context, token, getBracedReference str)
isDereferencing = (`elem` ["-eq", "-ne", "-lt", "-le", "-gt", "-ge"])
-- Try to get referenced variables from a literal string like "$foo"
-- Ignores tons of cases like arithmetic evaluation and array indices.
prop_getVariablesFromLiteral1 =
@ -2721,6 +2733,8 @@ prop_checkUnused23= verifyNotTree checkUnusedAssignments "a=1; [ -R a ]"
prop_checkUnused24= verifyNotTree checkUnusedAssignments "mapfile -C a b; echo ${b[@]}"
prop_checkUnused25= verifyNotTree checkUnusedAssignments "readarray foo; echo ${foo[@]}"
prop_checkUnused26= verifyNotTree checkUnusedAssignments "declare -F foo"
prop_checkUnused27= verifyTree checkUnusedAssignments "var=3; [ var -eq 3 ]"
prop_checkUnused28= verifyNotTree checkUnusedAssignments "var=3; [[ var -eq 3 ]]"
checkUnusedAssignments params t = execWriter (mapM_ warnFor unused)
where
flow = variableFlow params