Unicode codepoint flags for custom regexs (#7245)

* Replace CODEPOINT_TYPE_* with codepoint_flags
* Update and bugfix brute force random test
* Deterministic brute force random test
* Unicode normalization NFD
* Get rid of BOM

1 files changed, 116 insertions, 46 deletions

diff --git a/scripts/gen-unicode-data.py b/scripts/gen-unicode-data.py
index 37d1e396..744873c2 100644
--- a/scripts/gen-unicode-data.py
+++ b/scripts/gen-unicode-data.py
@@ -1,64 +1,134 @@
 import regex
+import ctypes
+import unicodedata
 
 
-def get_matches(regex_expr):
-    regex_expr_compiled = regex.compile(regex_expr)
-    unicode_ranges = []
-    current_range = None
+class CoodepointFlags (ctypes.Structure):
+    _fields_ = [  # see definition in unicode.h
+        ("is_undefined",   ctypes.c_uint16, 1),
+        ("is_number",      ctypes.c_uint16, 1),  # regex: \p{N}
+        ("is_letter",      ctypes.c_uint16, 1),  # regex: \p{L}
+        ("is_separator",   ctypes.c_uint16, 1),  # regex: \p{Z}
+        ("is_accent_mark", ctypes.c_uint16, 1),  # regex: \p{M}
+        ("is_punctuation", ctypes.c_uint16, 1),  # regex: \p{P}
+        ("is_symbol",      ctypes.c_uint16, 1),  # regex: \p{S}
+        ("is_control",     ctypes.c_uint16, 1),  # regex: \p{C}
+    ]
 
-    for codepoint in range(0x110000):
-        char = chr(codepoint)
-        if regex_expr_compiled.match(char):
-            if current_range is None:
-                current_range = [codepoint, codepoint]
-            else:
-                current_range[1] = codepoint
-        elif current_range is not None:
-            unicode_ranges.append(tuple(current_range))
-            current_range = None
 
-    if current_range is not None:
-        unicode_ranges.append(tuple(current_range))
+assert (ctypes.sizeof(CoodepointFlags) == 2)
 
-    return unicode_ranges
 
+MAX_CODEPOINTS = 0x110000
 
-def print_cat(mode, cat, ranges):
-    if mode == "range":
-        print("const std::vector<std::pair<uint32_t, uint32_t>> unicode_ranges_{} = {{".format(cat)) # noqa: NP100
-    if mode == "map":
-        print("const std::map<uint32_t, uint32_t> unicode_map_{} = {{".format(cat)) # noqa: NP100
-    for i, values in enumerate(ranges):
-        end = ",\n" if (i % 4 == 3 or i + 1 == len(ranges)) else ", "
-        values = ["0x%08X" % value for value in values]
-        print("{" + ", ".join(values) + "}", end=end) # noqa: NP100
-    print("};") # noqa: NP100
-    print("") # noqa: NP100
+regex_number      = regex.compile(r'\p{N}')
+regex_letter      = regex.compile(r'\p{L}')
+regex_separator   = regex.compile(r'\p{Z}')
+regex_accent_mark = regex.compile(r'\p{M}')
+regex_punctuation = regex.compile(r'\p{P}')
+regex_symbol      = regex.compile(r'\p{S}')
+regex_control     = regex.compile(r'\p{C}')
+regex_whitespace  = regex.compile(r'\s')
 
+codepoint_flags = (CoodepointFlags * MAX_CODEPOINTS)()
+table_whitespace = []
+table_lowercase = []
+table_uppercase = []
+table_nfd = []
 
-print_cat("range", "number",      get_matches(r'\p{N}'))
-print_cat("range", "letter",      get_matches(r'\p{L}'))
-print_cat("range", "separator",   get_matches(r'\p{Z}'))
-print_cat("range", "accent_mark", get_matches(r'\p{M}'))
-print_cat("range", "punctuation", get_matches(r'\p{P}'))
-print_cat("range", "symbol",      get_matches(r'\p{S}'))
-print_cat("range", "control",     get_matches(r'\p{C}'))
+for codepoint in range(MAX_CODEPOINTS):
+    # convert codepoint to unicode character
+    char = chr(codepoint)
 
-print_cat("range", "whitespace",  get_matches(r'\s'))
+    # regex categories
+    flags = codepoint_flags[codepoint]
+    flags.is_number      = bool(regex_number.match(char))
+    flags.is_letter      = bool(regex_letter.match(char))
+    flags.is_separator   = bool(regex_separator.match(char))
+    flags.is_accent_mark = bool(regex_accent_mark.match(char))
+    flags.is_punctuation = bool(regex_punctuation.match(char))
+    flags.is_symbol      = bool(regex_symbol.match(char))
+    flags.is_control     = bool(regex_control.match(char))
+    flags.is_undefined   = bytes(flags)[0] == 0
+    assert (not flags.is_undefined)
 
+    # whitespaces
+    if bool(regex_whitespace.match(char)):
+        table_whitespace.append(codepoint)
 
-map_lowercase = []
-map_uppercase = []
-for codepoint in range(0x110000):
-    char = chr(codepoint)
+    # lowercase conversion
     lower = ord(char.lower()[0])
-    upper = ord(char.upper()[0])
     if codepoint != lower:
-        map_lowercase.append((codepoint, lower))
+        table_lowercase.append((codepoint, lower))
+
+    # uppercase conversion
+    upper = ord(char.upper()[0])
     if codepoint != upper:
-        map_uppercase.append((codepoint, upper))
-print_cat("map", "lowercase", map_lowercase)
-print_cat("map", "uppercase", map_uppercase)
+        table_uppercase.append((codepoint, upper))
+
+    # NFD normalization
+    norm = ord(unicodedata.normalize('NFD', char)[0])
+    if codepoint != norm:
+        table_nfd.append((codepoint, norm))
+
+
+# group ranges with same flags
+ranges_flags = [(0, codepoint_flags[0])]  # start, flags
+for codepoint, flags in enumerate(codepoint_flags):
+    if bytes(flags) != bytes(ranges_flags[-1][1]):
+        ranges_flags.append((codepoint, flags))
+ranges_flags.append((MAX_CODEPOINTS, CoodepointFlags()))
+
+
+# group ranges with same nfd
+ranges_nfd = [(0, 0, 0)]  # start, last, nfd
+for codepoint, norm in table_nfd:
+    start = ranges_nfd[-1][0]
+    if ranges_nfd[-1] != (start, codepoint - 1, norm):
+        ranges_nfd.append(None)
+        start = codepoint
+    ranges_nfd[-1] = (start, codepoint, norm)
+
+
+# Generate 'unicode-data.cpp'
+
+
+def out(line=""):
+    print(line, end='\n')  # noqa
+
+
+out("""\
+// generated with scripts/gen-unicode-data.py
+
+#include "unicode-data.h"
+
+#include <cstdint>
+#include <vector>
+#include <unordered_map>
+#include <unordered_set>
+""")
+
+out("const std::vector<std::pair<uint32_t, uint16_t>> unicode_ranges_flags = {  // start, flags // last=next_start-1")
+for codepoint, flags in ranges_flags:
+    flags = int.from_bytes(bytes(flags), "little")
+    out("{0x%06X, 0x%04X}," % (codepoint, flags))
+out("};\n")
+
+out("const std::unordered_set<uint32_t> unicode_set_whitespace = {")
+out(", ".join("0x%06X" % cpt for cpt in table_whitespace))
+out("};\n")
+
+out("const std::unordered_map<uint32_t, uint32_t> unicode_map_lowercase = {")
+for tuple in table_lowercase:
+    out("{0x%06X, 0x%06X}," % tuple)
+out("};\n")
 
+out("const std::unordered_map<uint32_t, uint32_t> unicode_map_uppercase = {")
+for tuple in table_uppercase:
+    out("{0x%06X, 0x%06X}," % tuple)
+out("};\n")
 
-# TODO: generate unicode_map_nfd
+out("const std::vector<range_nfd> unicode_ranges_nfd = {  // start, last, nfd")
+for triple in ranges_nfd:
+    out("{0x%06X, 0x%06X, 0x%06X}," % triple)
+out("};\n")