tests: Add variable expansion tests

There are some corner cases in variable expansion which would be nice to
capture before going and rewriting the variable expansion code. The
majority of these are related to configuring files and strings with '@'
in them in conjunction with @ONLY being specified. Another is testing
for '(' usage inside of ENV variable references based on whether it is
quoted or not.

Tests/RunCMake/Syntax/AtWithVariable-stderr.txt

@@ -0,0 +1 @@
+-->wrong<--

Tests/RunCMake/Syntax/AtWithVariable.cmake

@@ -0,0 +1,9 @@
+set(right "wrong")
+set(var "\${right}")
+# Expanded here.
+set(ref "@var@")
+
+# 'right' is dereferenced because 'var' was dereferenced when
+# assigning to 'ref' above.
+string(CONFIGURE "${ref}" output)
+message("-->${output}<--")

Tests/RunCMake/Syntax/AtWithVariableAtOnly-stderr.txt

@@ -0,0 +1 @@
+-->\${right}<--

Tests/RunCMake/Syntax/AtWithVariableAtOnly.cmake

@@ -0,0 +1,8 @@
+set(right "wrong")
+set(var "\${right}")
+# Expanded here.
+set(ref "@var@")
+
+# No dereference done at all.
+string(CONFIGURE "${ref}" output @ONLY)
+message("-->${output}<--")

Tests/RunCMake/Syntax/AtWithVariableAtOnlyFile-stderr.txt

@@ -0,0 +1,5 @@
+-->==>\${right}<==
+==><==
+==>\${var}<==
+==>\${empty}<==
+<--

Tests/RunCMake/Syntax/AtWithVariableAtOnlyFile.cmake

@@ -0,0 +1,9 @@
+set(right "wrong")
+set(var "\${right}")
+
+configure_file(
+  "${CMAKE_CURRENT_SOURCE_DIR}/atfile.txt.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/atfile.txt"
+  @ONLY)
+file(READ "${CMAKE_CURRENT_BINARY_DIR}/atfile.txt" output)
+message("-->${output}<--")

Tests/RunCMake/Syntax/AtWithVariableEmptyExpansion-stderr.txt

@@ -0,0 +1 @@
+-->\${right}<--

Tests/RunCMake/Syntax/AtWithVariableEmptyExpansion.cmake

@@ -0,0 +1,8 @@
+# Literal since 'var' is not defined.
+set(ref "@var@")
+set(right "wrong")
+set(var "\${right}")
+
+# 'var' is dereferenced here.
+string(CONFIGURE "${ref}" output)
+message("-->${output}<--")

Tests/RunCMake/Syntax/AtWithVariableEmptyExpansionAtOnly-stderr.txt

@@ -0,0 +1 @@
+-->\${right}<--

Tests/RunCMake/Syntax/AtWithVariableEmptyExpansionAtOnly.cmake

@@ -0,0 +1,8 @@
+# Literal since 'var' is not defined.
+set(ref "@var@")
+set(right "wrong")
+set(var "\${right}")
+
+# 'var' is dereferenced, but now 'right'
+string(CONFIGURE "${ref}" output @ONLY)
+message("-->${output}<--")

Tests/RunCMake/Syntax/AtWithVariableFile-stderr.txt

@@ -0,0 +1,5 @@
+-->==>\${right}<==
+==><==
+==>\${right}<==
+==><==
+<--

Tests/RunCMake/Syntax/AtWithVariableFile.cmake

@@ -0,0 +1,8 @@
+set(right "wrong")
+set(var "\${right}")
+
+configure_file(
+  "${CMAKE_CURRENT_SOURCE_DIR}/atfile.txt.in"
+  "${CMAKE_CURRENT_BINARY_DIR}/atfile.txt")
+file(READ "${CMAKE_CURRENT_BINARY_DIR}/atfile.txt" output)
+message("-->${output}<--")

Tests/RunCMake/Syntax/EscapeQuotes-stderr.txt

@@ -0,0 +1 @@
+-->"<--

Tests/RunCMake/Syntax/EscapeQuotes.cmake

@@ -0,0 +1,9 @@
+set(var "\"")
+set(ref "@var@")
+set(rref "\${var}")
+
+string(CONFIGURE "${ref}" output ESCAPE_QUOTES)
+message("-->${output}<--")
+
+string(CONFIGURE "${rref}" output ESCAPE_QUOTES)
+message("-->${output}<--")

Tests/RunCMake/Syntax/EscapedAt-stderr.txt

@@ -0,0 +1 @@
+-->\\n<--

Tests/RunCMake/Syntax/EscapedAt.cmake

@@ -0,0 +1,5 @@
+set(var "n")
+set(ref "\\@var@")
+
+string(CONFIGURE "${ref}" output)
+message("-->${output}<--")

Tests/RunCMake/Syntax/ExpandInAt-stderr.txt

@@ -0,0 +1 @@
+-->@foo@<--

Tests/RunCMake/Syntax/ExpandInAt.cmake

@@ -0,0 +1,6 @@
+set("\${varname}" bar)
+set(var foo)
+set(ref "@\${var}@")
+
+string(CONFIGURE "${ref}" output)
+message("-->${output}<--")

Tests/RunCMake/Syntax/ParenInENV-result.txt

@@ -0,0 +1 @@
+1

Tests/RunCMake/Syntax/ParenInENV-stderr.txt

@@ -0,0 +1,20 @@
+CMake Warning \(dev\) at CMakeLists.txt:3 \(include\):
+  Syntax Warning in cmake code at
+
+    .*/Tests/RunCMake/Syntax/ParenInENV.cmake:2:21
+
+  Argument not separated from preceding token by whitespace.
+This warning is for project developers.  Use -Wno-dev to suppress it.
+
+CMake Error at ParenInENV.cmake:2 \(message\):
+  Syntax error in cmake code at
+
+    .*/Tests/RunCMake/Syntax/ParenInENV.cmake:2
+
+  when parsing string
+
+    -->\$ENV{e
+
+  syntax error, unexpected \$end, expecting } \(9\)
+Call Stack \(most recent call first\):
+  CMakeLists.txt:3 \(include\)

Tests/RunCMake/Syntax/ParenInENV.cmake

@@ -0,0 +1,2 @@
+set("ENV{e(x)}" value)
+message(-->$ENV{e(x)}<--)

Tests/RunCMake/Syntax/ParenInQuotedENV-stderr.txt

@@ -0,0 +1 @@
+-->value<--

Tests/RunCMake/Syntax/ParenInQuotedENV.cmake

@@ -0,0 +1,2 @@
+set("ENV{e(x)}" value)
+message("-->$ENV{e(x)}<--")

Tests/RunCMake/Syntax/RunCMakeTest.cmake

@@ -52,3 +52,16 @@ run_cmake(UnterminatedString)
 run_cmake(UnterminatedBracket0)
 run_cmake(UnterminatedBracket1)
 run_cmake(UnterminatedBracketComment)
+
+# Variable expansion tests
+run_cmake(ExpandInAt)
+run_cmake(EscapedAt)
+run_cmake(EscapeQuotes)
+run_cmake(AtWithVariable)
+run_cmake(AtWithVariableEmptyExpansion)
+run_cmake(AtWithVariableAtOnly)
+run_cmake(AtWithVariableEmptyExpansionAtOnly)
+run_cmake(AtWithVariableFile)
+run_cmake(AtWithVariableAtOnlyFile)
+run_cmake(ParenInENV)
+run_cmake(ParenInQuotedENV)

Tests/RunCMake/Syntax/atfile.txt.in

@@ -0,0 +1,4 @@
+==>@var@<==
+==>@empty@<==
+==>${var}<==
+==>${empty}<==