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improved simplecpp::TokenList constructors#599

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Merged
firewave merged 2 commits into from
Dec 16, 2025
Merged

improved simplecpp::TokenList constructors #599

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097f9c7
added `simplecpp::View` to be able to write portable `simplecpp::Toke…
firewave Dec 8, 2025
c482be2
make `simplecpp::TokenList` constructors which take an array always a…
firewave Dec 10, 2025
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51 changes: 44 additions & 7 deletions simplecpp.h
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Original file line numberDiff line numberDiff line change
Expand Up@@ -69,6 +69,46 @@ namespace simplecpp {
enum cppstd_t : std::int8_t { CPPUnknown=-1, CPP03, CPP11, CPP14, CPP17, CPP20, CPP23, CPP26 };

using TokenString = std::string;

#if defined(__cpp_lib_string_view) && !defined(__cpp_lib_span)
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danmar marked this conversation as resolved.
using View = std::string_view;
#else
struct View
{
// cppcheck-suppress noExplicitConstructor
View(const char* data)
: mData(data)
, mSize(strlen(data))
{}

// only provide when std::span is not available so using untyped initilization won't use View
#if !defined(__cpp_lib_span)
View(const char* data, std::size_t size)
: mData(data)
, mSize(size)
{}

// cppcheck-suppress noExplicitConstructor
View(const std::string& str)
: mData(str.data())
, mSize(str.size())
{}
#endif // !defined(__cpp_lib_span)

const char* data() const {
return mData;
}

std::size_t size() const {
return mSize;
}

private:
const char* mData;
std::size_t mSize;
};
#endif // defined(__cpp_lib_string_view) && !defined(__cpp_lib_span)

class Macro;

/**
Expand DownExpand Up@@ -217,7 +257,6 @@ namespace simplecpp {
explicit TokenList(std::vector<std::string> &filenames);
/** generates a token list from the given std::istream parameter */
TokenList(std::istream &istr, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr);
#ifdef SIMPLECPP_TOKENLIST_ALLOW_PTR
/** generates a token list from the given buffer */
template<size_t size>
TokenList(const char (&data)[size], std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
Expand All@@ -228,7 +267,7 @@ namespace simplecpp {
TokenList(const unsigned char (&data)[size], std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
: TokenList(data, size-1, filenames, filename, outputList, 0)
{}

#ifdef SIMPLECPP_TOKENLIST_ALLOW_PTR
/** generates a token list from the given buffer */
TokenList(const unsigned char* data, std::size_t size, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
: TokenList(data, size, filenames, filename, outputList, 0)
Expand All@@ -237,13 +276,11 @@ namespace simplecpp {
TokenList(const char* data, std::size_t size, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
: TokenList(reinterpret_cast<const unsigned char*>(data), size, filenames, filename, outputList, 0)
{}
#endif
#if defined(__cpp_lib_string_view) && !defined(__cpp_lib_span)
#endif // SIMPLECPP_TOKENLIST_ALLOW_PTR
/** generates a token list from the given buffer */
TokenList(std::string_view data, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
TokenList(View data, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
: TokenList(reinterpret_cast<const unsigned char*>(data.data()), data.size(), filenames, filename, outputList, 0)
{}
#endif
#ifdef __cpp_lib_span
/** generates a token list from the given buffer */
TokenList(std::span<const char> data, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
Expand All@@ -254,7 +291,7 @@ namespace simplecpp {
TokenList(std::span<const unsigned char> data, std::vector<std::string> &filenames, const std::string &filename=std::string(), OutputList *outputList = nullptr)
: TokenList(data.data(), data.size(), filenames, filename, outputList, 0)
{}
#endif
#endif // __cpp_lib_span

/** generates a token list from the given filename parameter */
TokenList(const std::string &filename, std::vector<std::string> &filenames, OutputList *outputList = nullptr);
Expand Down
94 changes: 85 additions & 9 deletions test.cpp
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Original file line numberDiff line numberDiff line change
Expand Up@@ -3299,20 +3299,97 @@ static void preprocess_files()
}
}

static void safe_api()
static void tokenlist_api()
{
// this test is to make sure the safe APIs are compiling
#if defined(__cpp_lib_string_view) || defined(__cpp_lib_span)
std::vector<std::string> filenames;
# if defined(__cpp_lib_string_view)
# if !defined(__cpp_lib_string_view) && !defined(__cpp_lib_span)
// sized array + size
{
char input[] = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList(input,sizeof(input),filenames,"");
}
{
const char input[] = "code";
simplecpp::TokenList(input,sizeof(input),filenames,"");
}
{
unsigned char input[] = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList(input,sizeof(input),filenames,"");
}
{
const unsigned char input[] = "code";
simplecpp::TokenList(input,sizeof(input),filenames,"");
}
#endif // !defined(__cpp_lib_string_view) && !defined(__cpp_lib_span)
// pointer via View
{
const char * const input = "code";
simplecpp::TokenList({input},filenames,"");
}
// sized array via View
{
char input[] = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList(simplecpp::View{input},filenames,"");
}
{
const char input[] = "code";
simplecpp::TokenList(simplecpp::View{input},filenames,"");
}
// sized array + size via View/std::span
{
char input[] = "code"; // NOLINT(misc-const-correctness)

@firewavefirewaveDec 10, 2025•
edited
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This is not actually reported but pre-emptively added in case it is detected in the future. I added a comment about it upstream: llvm/llvm-project#56758 (comment)

simplecpp::TokenList({input,sizeof(input)},filenames,"");
}
{
const char input[] = "code";
simplecpp::TokenList({input,sizeof(input)},filenames,"");
}
// sized array
{
char input[] = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList(input,filenames,"");
}
{
const char input[] = "code";
simplecpp::TokenList(input,filenames,"");
}
{
unsigned char input[] = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList(input,filenames,"");
}
{
const unsigned char input[] = "code";
simplecpp::TokenList(input,filenames,"");
}
// std::string via View/std::span (implicit)
{
std::string input = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList(input,filenames,"");
}
{
const std::string input = "code";
simplecpp::TokenList(input,filenames,"");
}
// std::string via View/std::span (explicit)
{
std::string input = "code"; // NOLINT(misc-const-correctness)
simplecpp::TokenList({input},filenames,"");
}
{
const std::string input = "code";
simplecpp::TokenList({input},filenames,"");
}

// this test is to make sure the safe APIs are compiling
#ifdef __cpp_lib_string_view
{
const char input[] = "code";
const std::string_view sv = input;
// std::string_view can be implicitly converted into a std::span
simplecpp::TokenList(sv,filenames,"");
}
# endif
#ifdef __cpp_lib_span
#endif // __cpp_lib_string_view
#ifdef __cpp_lib_span
{
char input[] = "code";
const std::span sp = input;
Expand All@@ -3333,8 +3410,7 @@ static void safe_api()
const std::span sp = input;
simplecpp::TokenList(sp,filenames,"");
}
# endif
#endif
#endif // __cpp_lib_span
}

static void isAbsolutePath() {
Expand DownExpand Up@@ -3660,7 +3736,7 @@ int main(int argc, char **argv)

TEST_CASE(preprocess_files);

TEST_CASE(safe_api);
TEST_CASE(tokenlist_api);

TEST_CASE(isAbsolutePath);

Expand Down