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283 lines
10 KiB
C++
283 lines
10 KiB
C++
#ifndef _C4_YML_COMMON_HPP_
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#define _C4_YML_COMMON_HPP_
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#include <cstddef>
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#include <c4/substr.hpp>
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#include <c4/yml/export.hpp>
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#ifndef RYML_USE_ASSERT
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# define RYML_USE_ASSERT C4_USE_ASSERT
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#endif
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#if RYML_USE_ASSERT
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# define RYML_ASSERT(cond) RYML_CHECK(cond)
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# define RYML_ASSERT_MSG(cond, msg) RYML_CHECK_MSG(cond, msg)
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#else
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# define RYML_ASSERT(cond)
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# define RYML_ASSERT_MSG(cond, msg)
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#endif
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#if defined(NDEBUG) || defined(C4_NO_DEBUG_BREAK)
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# define RYML_DEBUG_BREAK()
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#else
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# define RYML_DEBUG_BREAK() \
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{ \
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if(c4::get_error_flags() & c4::ON_ERROR_DEBUGBREAK) \
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{ \
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C4_DEBUG_BREAK(); \
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} \
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}
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#endif
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#define RYML_CHECK(cond) \
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do { \
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if(!(cond)) \
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{ \
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RYML_DEBUG_BREAK() \
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c4::yml::error("check failed: " #cond, c4::yml::Location(__FILE__, __LINE__, 0)); \
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} \
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} while(0)
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#define RYML_CHECK_MSG(cond, msg) \
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do \
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{ \
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if(!(cond)) \
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{ \
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RYML_DEBUG_BREAK() \
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c4::yml::error(msg ": check failed: " #cond, c4::yml::Location(__FILE__, __LINE__, 0)); \
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} \
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} while(0)
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#if C4_CPP >= 14
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# define RYML_DEPRECATED(msg) [[deprecated(msg)]]
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#else
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# if defined(_MSC_VER)
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# define RYML_DEPRECATED(msg) __declspec(deprecated(msg))
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# else // defined(__GNUC__) || defined(__clang__)
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# define RYML_DEPRECATED(msg) __attribute__((deprecated(msg)))
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# endif
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#endif
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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namespace c4 {
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namespace yml {
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C4_SUPPRESS_WARNING_GCC_CLANG_WITH_PUSH("-Wold-style-cast")
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enum : size_t {
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/** a null position */
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npos = size_t(-1),
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/** an index to none */
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NONE = size_t(-1)
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};
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//-----------------------------------------------------------------------------
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//! holds a position into a source buffer
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struct RYML_EXPORT LineCol
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{
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//! number of bytes from the beginning of the source buffer
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size_t offset;
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//! line
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size_t line;
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//! column
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size_t col;
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LineCol() : offset(), line(), col() {}
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//! construct from line and column
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LineCol(size_t l, size_t c) : offset(0), line(l), col(c) {}
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//! construct from offset, line and column
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LineCol(size_t o, size_t l, size_t c) : offset(o), line(l), col(c) {}
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};
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//! a source file position
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struct RYML_EXPORT Location : public LineCol
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{
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csubstr name;
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operator bool () const { return !name.empty() || line != 0 || offset != 0; }
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Location() : LineCol(), name() {}
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Location( size_t l, size_t c) : LineCol{ l, c}, name( ) {}
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Location( csubstr n, size_t l, size_t c) : LineCol{ l, c}, name(n) {}
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Location( csubstr n, size_t b, size_t l, size_t c) : LineCol{b, l, c}, name(n) {}
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Location(const char *n, size_t l, size_t c) : LineCol{ l, c}, name(to_csubstr(n)) {}
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Location(const char *n, size_t b, size_t l, size_t c) : LineCol{b, l, c}, name(to_csubstr(n)) {}
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};
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//-----------------------------------------------------------------------------
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/** the type of the function used to report errors. This function must
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* interrupt execution, either by raising an exception or calling
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* std::abort().
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*
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* @warning the error callback must never return: it must either abort
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* or throw an exception. Otherwise, the parser will enter into an
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* infinite loop, or the program may crash. */
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using pfn_error = void (*)(const char* msg, size_t msg_len, Location location, void *user_data);
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/** the type of the function used to allocate memory */
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using pfn_allocate = void* (*)(size_t len, void* hint, void *user_data);
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/** the type of the function used to free memory */
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using pfn_free = void (*)(void* mem, size_t size, void *user_data);
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/** trigger an error: call the current error callback. */
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RYML_EXPORT void error(const char *msg, size_t msg_len, Location loc);
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/** @overload error */
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inline void error(const char *msg, size_t msg_len)
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{
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error(msg, msg_len, Location{});
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}
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/** @overload error */
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template<size_t N>
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inline void error(const char (&msg)[N], Location loc)
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{
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error(msg, N-1, loc);
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}
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/** @overload error */
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template<size_t N>
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inline void error(const char (&msg)[N])
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{
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error(msg, N-1, Location{});
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}
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//-----------------------------------------------------------------------------
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/** a c-style callbacks class
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*
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* @warning the error callback must never return: it must either abort
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* or throw an exception. Otherwise, the parser will enter into an
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* infinite loop, or the program may crash. */
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struct RYML_EXPORT Callbacks
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{
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void * m_user_data;
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pfn_allocate m_allocate;
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pfn_free m_free;
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pfn_error m_error;
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Callbacks();
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Callbacks(void *user_data, pfn_allocate alloc, pfn_free free, pfn_error error_);
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bool operator!= (Callbacks const& that) const { return !operator==(that); }
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bool operator== (Callbacks const& that) const
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{
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return (m_user_data == that.m_user_data &&
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m_allocate == that.m_allocate &&
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m_free == that.m_free &&
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m_error == that.m_error);
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}
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};
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/** set the global callbacks.
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*
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* @warning the error callback must never return: it must either abort
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* or throw an exception. Otherwise, the parser will enter into an
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* infinite loop, or the program may crash. */
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RYML_EXPORT void set_callbacks(Callbacks const& c);
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/// get the global callbacks
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RYML_EXPORT Callbacks const& get_callbacks();
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/// set the global callbacks back to their defaults
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RYML_EXPORT void reset_callbacks();
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/// @cond dev
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#define _RYML_CB_ERR(cb, msg_literal) \
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do \
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{ \
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const char msg[] = msg_literal; \
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RYML_DEBUG_BREAK() \
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(cb).m_error(msg, sizeof(msg), c4::yml::Location(__FILE__, 0, __LINE__, 0), (cb).m_user_data); \
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} while(0)
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#define _RYML_CB_CHECK(cb, cond) \
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do \
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{ \
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if(!(cond)) \
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{ \
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const char msg[] = "check failed: " #cond; \
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RYML_DEBUG_BREAK() \
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(cb).m_error(msg, sizeof(msg), c4::yml::Location(__FILE__, 0, __LINE__, 0), (cb).m_user_data); \
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} \
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} while(0)
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#ifdef RYML_USE_ASSERT
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#define _RYML_CB_ASSERT(cb, cond) _RYML_CB_CHECK((cb), (cond))
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#else
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#define _RYML_CB_ASSERT(cb, cond) do {} while(0)
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#endif
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#define _RYML_CB_ALLOC_HINT(cb, T, num, hint) (T*) (cb).m_allocate((num) * sizeof(T), (hint), (cb).m_user_data)
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#define _RYML_CB_ALLOC(cb, T, num) _RYML_CB_ALLOC_HINT((cb), (T), (num), nullptr)
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#define _RYML_CB_FREE(cb, buf, T, num) \
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do { \
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(cb).m_free((buf), (num) * sizeof(T), (cb).m_user_data); \
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(buf) = nullptr; \
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} while(0)
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namespace detail {
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template<int8_t signedval, uint8_t unsignedval>
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struct _charconstant_t
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: public std::conditional<std::is_signed<char>::value,
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std::integral_constant<int8_t, signedval>,
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std::integral_constant<uint8_t, unsignedval>>::type
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{};
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#define _RYML_CHCONST(signedval, unsignedval) ::c4::yml::detail::_charconstant_t<INT8_C(signedval), UINT8_C(unsignedval)>::value
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} // namespace detail
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namespace detail {
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struct _SubstrWriter
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{
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substr buf;
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size_t pos;
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_SubstrWriter(substr buf_, size_t pos_=0) : buf(buf_), pos(pos_) {}
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void append(csubstr s)
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{
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C4_ASSERT(!s.overlaps(buf));
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if(pos + s.len <= buf.len)
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memcpy(buf.str + pos, s.str, s.len);
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pos += s.len;
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}
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void append(char c)
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{
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if(pos < buf.len)
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buf.str[pos] = c;
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++pos;
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}
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void append_n(char c, size_t numtimes)
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{
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if(pos + numtimes < buf.len)
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memset(buf.str + pos, c, numtimes);
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pos += numtimes;
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}
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size_t slack() const { return pos <= buf.len ? buf.len - pos : 0; }
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size_t excess() const { return pos > buf.len ? pos - buf.len : 0; }
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//! get the part written so far
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csubstr curr() const { return pos <= buf.len ? buf.first(pos) : buf; }
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//! get the part that is still free to write to (the remainder)
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substr rem() { return pos < buf.len ? buf.sub(pos) : buf.last(0); }
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size_t advance(size_t more) { pos += more; return pos; }
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};
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} // namespace detail
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/// @endcond
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C4_SUPPRESS_WARNING_GCC_CLANG_POP
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} // namespace yml
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} // namespace c4
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#endif /* _C4_YML_COMMON_HPP_ */
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