Replacement of internal RegEx with PCRE2

The pattern and replacement matching behaviour has been changed purely
due to the nature of switching to a standards-compliant library.

One mistake in the previous behaviour was that named groups didn't have
a number. This has been corrected.

As names are actually just an alias of numbered groups,
RegExMatch::get_name_dict() is now get_names() and is a dict
referring to the group number it represents.

Duplicate names are enabled and the with the first matching instance
used.

Due the lack of a suitable equivalent in PCRE2, RegExMatch::expand() was
removed.

1 files changed, 45 insertions, 2 deletions

diff --git a/modules/regex/SCsub b/modules/regex/SCsub
index 0882406761..0fbdf97620 100644
--- a/modules/regex/SCsub
+++ b/modules/regex/SCsub
@@ -1,7 +1,50 @@
 #!/usr/bin/env python
 
 Import('env')
+Import('env_modules')
 
-env.add_source_files(env.modules_sources, "*.cpp")
+env_regex = env_modules.Clone()
+env_regex.Append(CPPFLAGS=["-DPCRE2_CODE_UNIT_WIDTH=0"])
+env_regex.add_source_files(env.modules_sources, "*.cpp")
 
-Export('env')
+if (env['builtin_pcre2'] != 'no'):
+    thirdparty_dir = "#thirdparty/pcre2/src/"
+    thirdparty_flags = ["-DPCRE2_STATIC", "-DHAVE_CONFIG_H", "-DSUPPORT_JIT"]
+    thirdparty_sources = [
+        "pcre2_auto_possess.c",
+        "pcre2_chartables.c",
+        "pcre2_compile.c",
+        "pcre2_config.c",
+        "pcre2_context.c",
+        "pcre2_dfa_match.c",
+        "pcre2_error.c",
+        "pcre2_find_bracket.c",
+        "pcre2_jit_compile.c",
+        "pcre2_maketables.c",
+        "pcre2_match.c",
+        "pcre2_match_data.c",
+        "pcre2_newline.c",
+        "pcre2_ord2utf.c",
+        "pcre2_pattern_info.c",
+        "pcre2_serialize.c",
+        "pcre2_string_utils.c",
+        "pcre2_study.c",
+        "pcre2_substitute.c",
+        "pcre2_substring.c",
+        "pcre2_tables.c",
+        "pcre2_ucd.c",
+        "pcre2_valid_utf.c",
+        "pcre2_xclass.c",
+    ]
+    thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
+    env_regex.Append(CPPPATH=[thirdparty_dir])
+    env_regex.Append(CPPFLAGS=thirdparty_flags)
+    def pcre2_builtin(width):
+        env_pcre2 = env_modules.Clone()
+        env_pcre2["OBJSUFFIX"] = "_" + width + env_pcre2["OBJSUFFIX"]
+        env_pcre2.Append(CPPPATH=[thirdparty_dir])
+        env_pcre2.add_source_files(env.modules_sources, thirdparty_sources)
+        env_pcre2.Append(CPPFLAGS=thirdparty_flags)
+        env_pcre2.Append(CPPFLAGS=["-DPCRE2_CODE_UNIT_WIDTH=" + width])
+    pcre2_builtin("16")
+    pcre2_builtin("32")