updated from Atlas

04-text-byte/sanitize.py

@@ -0,0 +1,87 @@
+
+"""
+Radical folding and text sanitizing.
+
+Handling a string with `cp1252` symbols:
+
+    >>> order = '“Herr Voß: • ½ cup of Œtker™ caffè latte • bowl of açaí.”'
+    >>> shave_marks(order)
+    '“Herr Voß: • ½ cup of Œtker™ caffe latte • bowl of acai.”'
+    >>> shave_marks_latin(order)
+    '“Herr Voß: • ½ cup of Œtker™ caffe latte • bowl of acai.”'
+    >>> dewinize(order)
+    '"Herr Voß: - ½ cup of OEtker(TM) caffè latte - bowl of açaí."'
+    >>> asciize(order)
+    '"Herr Voss: - 1⁄2 cup of OEtker(TM) caffe latte - bowl of acai."'
+
+Handling a string with Greek and Latin accented characters:
+
+    >>> greek = 'Ζέφυρος, Zéfiro'
+    >>> shave_marks(greek)
+    'Ζεφυρος, Zefiro'
+    >>> shave_marks_latin(greek)
+    'Ζέφυρος, Zefiro'
+    >>> dewinize(greek)
+    'Ζέφυρος, Zéfiro'
+    >>> asciize(greek)
+    'Ζέφυρος, Zefiro'
+
+"""
+
+# BEGIN SHAVE_MARKS
+import unicodedata
+import string
+
+
+def shave_marks(txt):
+    """Remove all diacritic marks"""
+    norm_txt = unicodedata.normalize('NFD', txt)  # <1>
+    shaved = ''.join(c for c in norm_txt
+                     if not unicodedata.combining(c))  # <2>
+    return unicodedata.normalize('NFC', shaved)  # <3>
+# END SHAVE_MARKS
+
+# BEGIN SHAVE_MARKS_LATIN
+def shave_marks_latin(txt):
+    """Remove all diacritic marks from Latin base characters"""
+    norm_txt = unicodedata.normalize('NFD', txt)  # <1>
+    latin_base = False
+    keepers = []
+    for c in norm_txt:
+        if unicodedata.combining(c) and latin_base:   # <2>
+            continue  # ignore diacritic on Latin base char
+        keepers.append(c)                             # <3>
+        # if it isn't combining char, it's a new base char
+        if not unicodedata.combining(c):              # <4>
+            latin_base = c in string.ascii_letters
+    shaved = ''.join(keepers)
+    return unicodedata.normalize('NFC', shaved)   # <5>
+# END SHAVE_MARKS_LATIN
+
+# BEGIN ASCIIZE
+single_map = str.maketrans("""‚ƒ„†ˆ‹‘’“”•–—˜›""",  # <1>
+                           """'f"*^<''""---~>""")
+
+multi_map = str.maketrans({  # <2>
+    '€': '<euro>',
+    '…': '...',
+    'Œ': 'OE',
+    '™': '(TM)',
+    'œ': 'oe',
+    '‰': '<per mille>',
+    '‡': '**',
+})
+
+multi_map.update(single_map)  # <3>
+
+
+def dewinize(txt):
+    """Replace Win1252 symbols with ASCII chars or sequences"""
+    return txt.translate(multi_map)  # <4>
+
+
+def asciize(txt):
+    no_marks = shave_marks_latin(dewinize(txt))     # <5>
+    no_marks = no_marks.replace('ß', 'ss')          # <6>
+    return unicodedata.normalize('NFKC', no_marks)  # <7>
+# END ASCIIZE