From bb271180fd1126204bb6c775df6cb88fdbfc9f4e Mon Sep 17 00:00:00 2001
From: Alfi Maulana <alfi.maulana.f@gmail.com>
Date: Wed, 29 May 2024 14:44:54 +0700
Subject: [PATCH] refactor: separate assertion functions based on arguments

---
 cmake/Assertion.cmake | 180 ++++++++++++++++++++++++++++++------------
 1 file changed, 130 insertions(+), 50 deletions(-)

diff --git a/cmake/Assertion.cmake b/cmake/Assertion.cmake
index dfff286..797ac48 100644
--- a/cmake/Assertion.cmake
+++ b/cmake/Assertion.cmake
@@ -144,63 +144,143 @@ endmacro()
 
 # Asserts whether the given condition is true.
 #
-# This function performs an assertion on the given condition. It will output a
-# fatal error message if the assertion fails.
+# Arguments:
+#   - ARG0: The first argument.
+macro(_assert_internal_assert_1 ARG0)
+  if("${ARG0}" STREQUAL NOT)
+    # Do nothing on an empty condition.
+  else()
+    if(NOT "${ARG0}")
+      message(FATAL_ERROR "expected '${ARG0}' to resolve to true")
+    endif()
+  endif()
+endmacro()
+
+# Asserts whether the given condition is false.
 #
-# Refer to the documentation of the 'if' function for supported conditions to
-# perform the assertion.
-function(assert)
-  list(LENGTH ARGN ARGUMENTS_LENGTH)
-  if(ARGUMENTS_LENGTH GREATER 0)
-    set(ARGUMENTS ${ARGN})
+# Arguments:
+#   - ARG0: The first argument.
+macro(_assert_internal_assert_1_not ARG0)
+  if("${ARG0}")
+    message(FATAL_ERROR "expected '${ARG0}' to resolve to false")
+  endif()
+endmacro()
 
-    # Determines whether the given arguments start with 'NOT'.
-    list(GET ARGUMENTS 0 ARGUMENTS_0)
-    if(ARGUMENTS_0 STREQUAL NOT)
-      list(REMOVE_AT ARGUMENTS 0)
-      set(HAS_NOT TRUE)
-      set(WITH_NOT _not)
+# Asserts whether the given unary condition is true.
+#
+# Arguments:
+#   - ARG0: The first argument.
+#   - ARG1: The second argument.
+macro(_assert_internal_assert_2 ARG0 ARG1)
+  if("${ARG0}" STREQUAL NOT)
+    _assert_internal_assert_1_not("${ARG1}")
+  else()
+    string(TOLOWER "${ARG0}" OPERATOR)
+    if(COMMAND "_assert_internal_assert_2_${OPERATOR}")
+      cmake_language(
+        CALL "_assert_internal_assert_2_${OPERATOR}" "${ARG1}"
+      )
     else()
-      set(HAS_NOT FALSE)
-      set(WITH_NOT "")
+      message(FATAL_ERROR "unsupported condition: ${ARG0} ${ARG1}")
     endif()
+  endif()
+endmacro()
 
-    list(LENGTH ARGUMENTS ARGUMENTS_LENGTH)
-    if(ARGUMENTS_LENGTH EQUAL 0)
-      # Do nothing on an empty condition.
-    elseif(ARGUMENTS_LENGTH EQUAL 1)
-      list(GET ARGUMENTS 0 VALUE)
-      if(HAS_NOT AND "${VALUE}")
-        message(FATAL_ERROR "expected '${VALUE}' to resolve to false")
-      elseif(NOT HAS_NOT AND NOT "${VALUE}")
-        message(FATAL_ERROR "expected '${VALUE}' to resolve to true")
-      endif()
-    elseif(ARGUMENTS_LENGTH EQUAL 2)
-      list(GET ARGUMENTS 0 OPERATOR)
-      string(TOLOWER "${OPERATOR}" OPERATOR)
-      if(COMMAND "_assert_internal_assert_2${WITH_NOT}_${OPERATOR}")
-        list(GET ARGUMENTS 1 VALUE)
-        cmake_language(CALL "_assert_internal_assert_2${WITH_NOT}_${OPERATOR}" "${VALUE}")
-      else()
-        string(REPLACE ";" " " ARGUMENTS "${ARGUMENTS}")
-        message(FATAL_ERROR "unsupported condition: ${ARGUMENTS}")
-      endif()
-    elseif(ARGUMENTS_LENGTH EQUAL 3)
-      list(GET ARGUMENTS 1 OPERATOR)
-      string(TOLOWER "${OPERATOR}" OPERATOR)
-      if(COMMAND "_assert_internal_assert_3${WITH_NOT}_${OPERATOR}")
-        list(GET ARGUMENTS 0 LEFT_VALUE)
-        list(GET ARGUMENTS 2 RIGHT_VALUE)
-        cmake_language(CALL "_assert_internal_assert_3${WITH_NOT}_${OPERATOR}" "${LEFT_VALUE}" "${RIGHT_VALUE}")
-      else()
-        string(REPLACE ";" " " ARGUMENTS "${ARGUMENTS}")
-        message(FATAL_ERROR "unsupported condition: ${ARGUMENTS}")
-      endif()
-    elseif(ARGUMENTS_LENGTH GREATER 1)
-      string(REPLACE ";" " " ARGUMENTS "${ARGUMENTS}")
-      message(FATAL_ERROR "unsupported condition: ${ARGUMENTS}")
+# Asserts whether the given unary condition is false.
+#
+# Arguments:
+#   - ARG0: The first argument.
+#   - ARG1: The second argument.
+macro(_assert_internal_assert_2_not ARG0 ARG1)
+  string(TOLOWER "${ARG0}" OPERATOR)
+  if(COMMAND "_assert_internal_assert_2_not_${OPERATOR}")
+    cmake_language(
+      CALL "_assert_internal_assert_2_not_${OPERATOR}" "${ARG1}"
+    )
+  else()
+    message(FATAL_ERROR "unsupported condition: ${ARG0} ${ARG1}")
+  endif()
+endmacro()
+
+# Asserts whether the given binary condition is true.
+#
+# Arguments:
+#   - ARG0: The first argument.
+#   - ARG1: The second argument.
+#   - ARG2: The third argument.
+macro(_assert_internal_assert_3 ARG0 ARG1 ARG2)
+  if("${ARG0}" STREQUAL NOT)
+    _assert_internal_assert_2_not("${ARG1}" "${ARG2}")
+  else()
+    string(TOLOWER "${ARG1}" OPERATOR)
+    if(COMMAND "_assert_internal_assert_3_${OPERATOR}")
+      cmake_language(
+        CALL "_assert_internal_assert_3_${OPERATOR}" "${ARG0}" "${ARG2}"
+      )
+    else()
+      message(FATAL_ERROR "unsupported condition: ${ARG0} ${ARG1} ${ARG2}")
     endif()
   endif()
+endmacro()
+
+# Asserts whether the given binary condition is false.
+#
+# Arguments:
+#   - ARG0: The first argument.
+#   - ARG1: The second argument.
+#   - ARG2: The third argument.
+macro(_assert_internal_assert_3_not ARG0 ARG1 ARG2)
+  string(TOLOWER "${ARG1}" OPERATOR)
+  if(COMMAND "_assert_internal_assert_3_not_${OPERATOR}")
+    cmake_language(
+      CALL "_assert_internal_assert_3_not_${OPERATOR}" "${ARG0}" "${ARG2}"
+    )
+  else()
+    message(FATAL_ERROR "unsupported condition: ${ARG0} ${ARG1} ${ARG2}")
+  endif()
+endmacro()
+
+# Asserts whether the given condition is true.
+#
+# Arguments:
+#   - ARG0: The first argument.
+#   - ARG1: The second argument.
+#   - ARG2: The third argument.
+#   - ARG3: The fourth argument.
+macro(_assert_internal_assert_4 ARG0 ARG1 ARG2 ARG3)
+  if("${ARG0}" STREQUAL NOT)
+    _assert_internal_assert_3_not("${ARG1}" "${ARG2}" "${ARG3}")
+  else()
+    message(FATAL_ERROR "unsupported condition: ${ARG0} ${ARG1} ${ARG2} ${ARG3}")
+  endif()
+endmacro()
+
+# Asserts the given condition.
+#
+# This function performs an assertion on the given condition. It will output a
+# fatal error message if the assertion fails.
+#
+# Refer to the documentation of the 'if' function for supported conditions to
+# perform the assertion.
+function(assert)
+  if(ARGC EQUAL 0)
+    # Do nothing on an empty condition.
+  elseif(ARGC EQUAL 1)
+    _assert_internal_assert_1("${ARGV0}")
+  elseif(ARGC EQUAL 2)
+    _assert_internal_assert_2("${ARGV0}" "${ARGV1}")
+  elseif(ARGC EQUAL 3)
+    _assert_internal_assert_3("${ARGV0}" "${ARGV1}" "${ARGV2}")
+  elseif(ARGC EQUAL 4)
+    _assert_internal_assert_4("${ARGV0}" "${ARGV1}" "${ARGV2}" "${ARGV3}")
+  else()
+    set(ARGS "${ARGV0} ${ARGV1} ${ARGV2} ${ARGV3}")
+    math(EXPR STOP "${ARGC} - 1")
+    foreach(I RANGE 4 STOP)
+      set(ARGS "${ARGS} ${ARGV${I}}")
+    endforeach()
+    message(FATAL_ERROR "unsupported condition: ${ARGS}")
+  endif()
 endfunction()
 
 # Begins a scope for mocking the 'message' function.