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122 lines
6.6 KiB
122 lines
6.6 KiB
#pragma once
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// Code generated by muli-line pre-processor macros is hard to read after
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// pre-processing.
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//
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// When you want to check pre-processed code, e.g. for debugging or
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// to understand what's going on, do the following:
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//
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// 1) Add the compiler command line definition
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// -DKALEIDOSCOPE_ENABLE_MACRO_NEWLINE_SUBSTITUTION
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// This prevents the __NL__ macro being defined below.
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// 2) Generate the preprocessed code (it will contain a lot of __NL__ definitions).
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// 3) Open the pre-processed code in your favorite editor.
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// 3.1) Replace all __NL__ with newline characters.
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// In vim the command would be ':%s/__NL__/\r/g'.
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// 3.2) Autocorrect code-indenting to improve readability. This is necessary
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// as pre-processor macros remove all whitespaces at the beginning of lines.
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// With vim, the command gg=G helps (just type the characters one after
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// the other).
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// 4) Don't forget to remove the
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// -DKALEIDOSCOPE_ENABLE_MACRO_NEWLINE_SUBSTITUTION
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// from your compiler command line. Else the code won't compile.
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#ifndef KALEIDOSCOPE_ENABLE_MACRO_NEWLINE_SUBSTITUTION
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#define __NL__
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#endif
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#define __NN__
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// Some auxiliary macros
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//
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#define __STRINGIZE(S) #S
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#define STRINGIZE(S) __STRINGIZE(S)
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// Allow for the creation of verbose messages in static_asserts
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//
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#define VERBOSE_STATIC_ASSERT_HEADER \
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"\n" __NL__ \
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"\n***************************************************************" __NL__ \
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"\n******************** READ THIS CAREFULLY! *********************" __NL__ \
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"\n***************************************************************" __NL__ \
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"\n"
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#define VERBOSE_STATIC_ASSERT_FOOTER \
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"\n" __NL__ \
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"\n***************************************************************" __NL__ \
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"\n***************************************************************" __NL__ \
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"\n***************************************************************" __NL__ \
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"\n"
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#define VERBOSE_FILE_INFO \
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"\nFile: " __FILE__ __NL__
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#define VERBOSE_LINE_INFO \
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"\nLine: " STRINGIZE(__LINE__) __NL__
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// The macro function RESTRICT_ARGS_COUNT can be used to generate more
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// verbose error messages when users supply an insuitable number of arguments
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// to a macro.
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//
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// For a macro it is used wherever one of the arguments A, B, C might
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// be used, e.g.
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//
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#if 0 // This is just so that A_MACRO is not actually defined
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#define A_MACRO(A, B, C, ...) \
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(void)RESTRICT_ARGS_COUNT(0, 3, A_MACRO, ##__VA_ARGS__); \
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int a = A; \
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int b = B; \
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int c = C;
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#endif
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//
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// Note that RESTRICT_ARGS_COUNT can also be invoked wherever one of the macro
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// arguments is used, e.g.
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//
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#if 0 // This is just so that B_MACRO is not actually defined
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#define B_MACRO(A, B, C, ...)
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int array[] = { A, B, RESTRICT_ARGS_COUNT(C, 3, B_MACRO, ##__VA_ARGS__) };
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#endif
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//
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#define RESTRICT_ARGS_COUNT(B, \
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NUM_EXPECTED_ARGS, \
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ORIGINAL_MACRO, \
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...) \
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( __NL__ \
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[]{ /* Here we are in the body of a dummy lambda function. */ __NL__ \
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/* []{} is, BTW, the shortest way to write a lambda. */ __NL__ \
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/* It is only used to hold the static_assert that cannot be */ __NL__ \
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/* defined directly in the keymap initializer list. By using the */ __NL__ \
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/* comma operator ((A, B) always evaluates to b), we ensure */ __NL__ \
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/* that not the lambda but B is what ASSERT_ARGS_COUNT */ __NL__ \
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/* finally evaluates to. */ __NL__ \
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/* Please not that passing B through this macro is a must */ __NL__ \
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/* as we need it for the comma operator to work. */ __NL__ \
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static_assert(sizeof(const char) == sizeof(#__VA_ARGS__ ), __NL__ \
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/* sizeof(const char) == sizeof(#__VA_ARGS__ ) checks the quoted */ __NL__ \
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/* list of additional arguments. If there are none, then the */ __NL__ \
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/* length of #__VA_ARGS__ is a single char as it contains '\0'. */ __NL__ \
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/* This check is not able to find the corner case of a single */ __NL__ \
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/* superfluous comma at the end of the macro arguments as this */ __NL__ \
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/* causes #__VA_ARGS__ being empty (only '\0'). */ __NL__ \
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VERBOSE_STATIC_ASSERT_HEADER __NL__ \
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__NL__ \
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VERBOSE_FILE_INFO __NL__ \
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VERBOSE_LINE_INFO __NL__ \
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"\n" __NL__ \
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"\nStrange arguments found in invocation of " #ORIGINAL_MACRO "." __NL__ \
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"\n" __NL__ \
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"\nPlease make sure to pass exactly " #NUM_EXPECTED_ARGS __NL__ \
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" macro arguments to" __NL__ \
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"\n" #ORIGINAL_MACRO ". Also make sure that there are no dangling" __NL__ \
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"\ncommas at the end of the argument list." __NL__ \
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"\n" __NL__ \
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"\nThis is the superfluous part at the end of the macro" __NL__ \
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"\narguments list: \'" #__VA_ARGS__ "\'" __NL__ \
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__NL__ \
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VERBOSE_STATIC_ASSERT_FOOTER __NL__ \
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); __NL__ \
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__NL__ \
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}, /* End of dummy lambda, the comma operator's A operand. */ __NL__ \
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B /* The overall ASSERT_ARGS_COUNT evaluates to B. */ __NL__ \
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)
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