[gnome-characters/wip/exalm/unistring: 8/15] lib: Add a script for generating blocks

[Alexander Mikhaylenko <alexm src gnome org>]

commit 710f60d80a401dbb5e65169ddd9a4505dd1474d8
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Fri Nov 26 04:36:18 2021 +0500

    lib: Add a script for generating blocks
    
    We'll need this too.

 lib/gen-blocks.py | 54 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
---
diff --git a/lib/gen-blocks.py b/lib/gen-blocks.py
new file mode 100755
index 0000000..2c2181a
--- /dev/null
+++ b/lib/gen-blocks.py
@@ -0,0 +1,54 @@
+#!/usr/bin/python3
+
+# Input: https://www.unicode.org/Public/UNIDATA/Blocks.txt
+
+import io
+import re
+
+class Builder(object):
+    def __init__(self):
+        pass
+
+    def read(self, infile):
+        names = []
+        for line in infile:
+            if line.startswith('#'):
+                continue
+            line = line.strip()
+            if len(line) == 0:
+                continue
+            range, name = line.split(';', 2)
+            start, end = range.split('..')
+            name = name.lstrip()
+
+            names.append((start, end, name))
+
+        return names
+
+    def write(self, data):
+        print('''\
+struct Block
+{
+  gunichar start;
+  gunichar end;
+  const char *name;
+};''')
+        print('static const struct Block all_blocks[] =\n  {')
+        s = ''
+        offset = 0
+        for start, end, name in data:
+            print('    {{ 0x{0}, 0x{1}, "{2}" }},'.format(start, end, name))
+        print('  };')
+
+if __name__ == '__main__':
+    import argparse
+
+    parser = argparse.ArgumentParser(description='build')
+    parser.add_argument('infile', type=argparse.FileType('r'),
+                        help='input file')
+    args = parser.parse_args()
+
+    builder = Builder()
+    # FIXME: argparse.FileType(encoding=...) is available since Python 3.4
+    data = builder.read(io.open(args.infile.name, encoding='utf_8_sig'))
+    builder.write(data)