Add Meson build

meson.build

@@ -0,0 +1,215 @@
+project(
+  'reflex',
+  'cpp',
+  version: '6.3.0',
+  license: 'BSD-3-Clause',
+  meson_version: '>= 1.5.0',
+  default_options: {
+    'cpp_std': 'c++11',
+  },
+)
+
+includes = include_directories('include')
+
+cpp = meson.get_compiler('cpp')
+msvc = cpp.get_argument_syntax() == 'msvc'
+
+flags = cpp.get_supported_arguments(['-Wno-non-virtual-dtor'])
+add_project_arguments(
+  flags,
+  language: 'cpp',
+)
+
+unicode_sources = files(
+  'unicode/block_scripts.cpp',
+  'unicode/composer.cpp',
+  'unicode/language_scripts.cpp',
+  'unicode/letter_case.cpp',
+  'unicode/letter_scripts.cpp',
+)
+
+libreflex_sources = files(
+  'lib/convert.cpp',
+  'lib/debug.cpp',
+  'lib/error.cpp',
+  'lib/input.cpp',
+  'lib/matcher.cpp',
+  'lib/pattern.cpp',
+  'lib/posix.cpp',
+  'lib/simd.cpp',
+  'lib/unicode.cpp',
+  'lib/utf8.cpp',
+)
+
+libreflexmin_sources = files(
+  'lib/debug.cpp',
+  'lib/error.cpp',
+  'lib/input.cpp',
+  'lib/matcher.cpp',
+  'lib/pattern.cpp',
+  'lib/simd.cpp',
+  'lib/utf8.cpp',
+)
+
+have_simd_sse2 = cpp.compiles(
+  '''
+  #include <emmintrin.h>
+  int main(int argc, char** argv) {
+    __m128i n = _mm_set1_epi8(42);
+  }
+  ''',
+  args: msvc ? '/arch:SSE2' : '-msse2',
+  name: 'cxx supports SSE2 intrinsics with options [\'-msse2\']',
+  required: get_option('sse2'),
+)
+
+have_simd_avx2 = cpp.compiles(
+  '''
+  #include <immintrin.h>
+  int main(int argc, char** argv) {
+    __m256i n = _mm256_set1_epi8(42);
+    (void)_mm256_movemask_epi8(_mm256_and_si256(n, n));
+  }
+  ''',
+  args: msvc ? '/arch:AVX2' : '-mavx2',
+  name: 'cxx supports AVX2 intrinsics with options [\'-mavx2\']',
+  required: get_option('avx2'),
+)
+
+have_simd_avx512bw = cpp.compiles(
+  '''
+  #include <immintrin.h>
+  int main(int argc, char** argv) {
+    __m512i n = _mm512_set1_epi8(42);
+    (void)_mm512_cmpeq_epi8_mask(n, n);
+  }
+  ''',
+  args: msvc ? '/arch:AVX512' : '-mavx512bw',
+  name: 'cxx supports AVX512BW intrinsics with options [\'-mavx512bw\']',
+  required: get_option('avx512bw'),
+)
+
+if have_simd_avx512bw
+  simd_args = [msvc ? '/arch:SSE2' : '-msse2']
+  simd_avx2_args = [msvc ? '/arch:AVX2' : '-mavx2']
+  simd_avx512bw_args = [msvc ? '/arch:AVX512' : '-mavx512bw']
+  add_project_arguments(
+    '-DHAVE_AVX512BW',
+    language: 'cpp',
+  )
+elif have_simd_avx2
+  simd_args = [msvc ? '/arch:SSE2' : '-msse2']
+  simd_avx2_args = [msvc ? '/arch:AVX2' : '-mavx2']
+  simd_avx512bw_args = []
+  add_project_arguments(
+    '-DHAVE_AVX2',
+    language: 'cpp',
+  )
+elif have_simd_sse2
+  simd_args = [msvc ? '/arch:SSE2' : '-msse2']
+  simd_avx2_args = []
+  simd_avx512bw_args = []
+  add_project_arguments(
+    '-DHAVE_SSE2',
+    language: 'cpp',
+  )
+else
+  simd_args = []
+  simd_avx2_args = []
+  simd_avx512bw_args = []
+endif
+
+neon_option = get_option('neon')
+have_neon = false
+if not neon_option.disabled()
+  foreach args : [[], ['-mfpu=neon'], ['-march=native', '-mfpu=neon']]
+    have_neon = cpp.compiles(
+      '''
+      #include <arm_neon.h>
+      int main(int argc, char** argv) {
+        uint64x2_t n;
+        uint64_t m = vgetq_lane_u64(n, 0);
+      }
+      ''',
+      args: args,
+      name: 'cxx supports NEON intrinsics with options @0@'.format(args),
+      required: false,
+    )
+    if have_neon
+      simd_args = args
+      add_project_arguments(
+        '-DHAVE_NEON',
+        language: 'cpp',
+      )
+      break
+    endif
+  endforeach
+endif
+
+if neon_option.enabled() and not have_neon
+  error('NEON support was enabled but the compiler does not support NEON intrinsics')
+endif
+
+libsimd_avx2 = static_library(
+  'libsimd_avx2',
+  'lib/matcher_avx2.cpp',
+  'lib/simd_avx2.cpp',
+  cpp_args: simd_avx2_args,
+  pic: true,
+  include_directories: includes,
+  build_by_default: false,
+)
+
+libsimd_avx512bw = static_library(
+  'libsimd_avx512bw',
+  'lib/matcher_avx512bw.cpp',
+  'lib/simd_avx512bw.cpp',
+  cpp_args: simd_avx512bw_args,
+  pic: true,
+  include_directories: includes,
+  build_by_default: false,
+  # clang 14.0 fails to compile this code at optimization levels higher than 0
+  override_options: cpp.get_id() == 'clang' and cpp.version() == '14.0.0' ? {
+    'optimization': '0',
+  } : {},
+)
+
+# No DLLEXPORT declarations, thus only static library supported with MSVC
+library = msvc ? 'static_library' : 'library'
+
+libreflexmin = build_target(
+  'reflexmin',
+  libreflexmin_sources,
+  include_directories: includes,
+  cpp_args: simd_args,
+  # Selected based on a runtime AVX2 AVX512BW check
+  link_whole: [libsimd_avx2, libsimd_avx512bw],
+  target_type: library,
+)
+
+libreflex = build_target(
+  'reflex',
+  libreflex_sources,
+  unicode_sources,
+  include_directories: includes,
+  cpp_args: simd_args,
+  # Selected based on a runtime AVX2 AVX512BW check
+  link_whole: [libsimd_avx2, libsimd_avx512bw],
+  target_type: library,
+)
+
+reflex = executable(
+  'reflex',
+  'src/reflex.cpp',
+  link_with: libreflex,
+  include_directories: includes,
+  install: true,
+  cpp_args: ['-DPLATFORM="@0@"'.format(host_machine.system())],
+)
+
+reflex_dep = declare_dependency(
+  link_with: libreflex,
+  include_directories: includes,
+)
+
+meson.override_find_program('reflex', reflex)

meson.options

@@ -0,0 +1,20 @@
+option(
+    'sse2',
+    type: 'feature',
+    value: 'auto',
+)
+option(
+    'avx2',
+    type: 'feature',
+    value: 'auto',
+)
+option(
+    'avx512bw',
+    type: 'feature',
+    value: 'auto',
+)
+option(
+    'neon',
+    type: 'feature',
+    value: 'auto',
+)