feat: extract CC
This commit is contained in:
gosangam
@@ -0,0 +1,467 @@
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#!/usr/bin/env python3
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"""Fix Bengali font encoding in cc.html.
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When textutil converts the CC RTF to HTML, it sees that the Inben* fonts
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are declared with \fcharset2 (Symbol encoding). It then maps the raw bytes
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(0x20–0xFF) through the Apple Symbol encoding table to Unicode codepoints
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like ℘ (U+2118), ⇓ (U+21D3), ∈ (U+2208), etc.
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But the Inben* fonts actually have their glyphs in the Private Use Area at
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U+F020–U+F0FF (i.e., U+F000 + original_byte). So the browser can't find
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the glyphs and falls back to system fonts, showing math symbols and Apple
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logos instead of Bengali script.
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This script:
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1. Identifies all CSS classes that use Inben* fonts
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2. Finds all <p> tags with those classes
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3. Remaps the incorrectly-encoded Unicode codepoints back to the PUA range
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that the font actually uses
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4. Writes the fixed HTML back to disk
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Usage:
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python3 scripts/fix-bengali-encoding.py
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"""
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import os
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import re
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import sys
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# ---------------------------------------------------------------------------
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# Apple Symbol encoding table: byte → Unicode codepoint
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# This is the mapping that textutil applied when converting the RTF.
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# Source: https://unicode.org/Public/MAPPINGS/VENDORS/APPLE/SYMBOL.TXT
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# ---------------------------------------------------------------------------
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APPLE_SYMBOL_BYTE_TO_UNICODE = {
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0x20: 0x0020, # SPACE
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0x21: 0x0021, # EXCLAMATION MARK
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0x22: 0x2200, # FOR ALL
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0x23: 0x0023, # NUMBER SIGN
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0x24: 0x2203, # THERE EXISTS
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0x25: 0x0025, # PERCENT SIGN
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0x26: 0x0026, # AMPERSAND
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0x27: 0x220D, # SMALL CONTAINS AS MEMBER
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0x28: 0x0028, # LEFT PARENTHESIS
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0x29: 0x0029, # RIGHT PARENTHESIS
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0x2A: 0x2217, # ASTERISK OPERATOR
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0x2B: 0x002B, # PLUS SIGN
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0x2C: 0x002C, # COMMA
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0x2D: 0x2212, # MINUS SIGN
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0x2E: 0x002E, # FULL STOP
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0x2F: 0x002F, # SOLIDUS
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0x30: 0x0030, # DIGIT ZERO
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0x31: 0x0031, # DIGIT ONE
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0x32: 0x0032, # DIGIT TWO
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0x33: 0x0033, # DIGIT THREE
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0x34: 0x0034, # DIGIT FOUR
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0x35: 0x0035, # DIGIT FIVE
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0x36: 0x0036, # DIGIT SIX
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0x37: 0x0037, # DIGIT SEVEN
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0x38: 0x0038, # DIGIT EIGHT
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0x39: 0x0039, # DIGIT NINE
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0x3A: 0x003A, # COLON
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0x3B: 0x003B, # SEMICOLON
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0x3C: 0x003C, # LESS-THAN SIGN
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0x3D: 0x003D, # EQUALS SIGN
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0x3E: 0x003E, # GREATER-THAN SIGN
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0x3F: 0x003F, # QUESTION MARK
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0x40: 0x2245, # APPROXIMATELY EQUAL TO
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0x41: 0x0391, # GREEK CAPITAL LETTER ALPHA
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0x42: 0x0392, # GREEK CAPITAL LETTER BETA
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0x43: 0x03A7, # GREEK CAPITAL LETTER CHI
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0x44: 0x0394, # GREEK CAPITAL LETTER DELTA
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0x45: 0x0395, # GREEK CAPITAL LETTER EPSILON
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0x46: 0x03A6, # GREEK CAPITAL LETTER PHI
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0x47: 0x0393, # GREEK CAPITAL LETTER GAMMA
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0x48: 0x0397, # GREEK CAPITAL LETTER ETA
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0x49: 0x0399, # GREEK CAPITAL LETTER IOTA
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0x4A: 0x03D1, # GREEK THETA SYMBOL
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0x4B: 0x039A, # GREEK CAPITAL LETTER KAPPA
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0x4C: 0x039B, # GREEK CAPITAL LETTER LAMDA
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0x4D: 0x039C, # GREEK CAPITAL LETTER MU
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0x4E: 0x039D, # GREEK CAPITAL LETTER NU
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0x4F: 0x039F, # GREEK CAPITAL LETTER OMICRON
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0x50: 0x03A0, # GREEK CAPITAL LETTER PI
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0x51: 0x0398, # GREEK CAPITAL LETTER THETA
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0x52: 0x03A1, # GREEK CAPITAL LETTER RHO
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0x53: 0x03A3, # GREEK CAPITAL LETTER SIGMA
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0x54: 0x03A4, # GREEK CAPITAL LETTER TAU
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0x55: 0x03A5, # GREEK CAPITAL LETTER UPSILON
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0x56: 0x03C2, # GREEK SMALL LETTER FINAL SIGMA
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0x57: 0x03A9, # GREEK CAPITAL LETTER OMEGA
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0x58: 0x039E, # GREEK CAPITAL LETTER XI
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0x59: 0x03A8, # GREEK CAPITAL LETTER PSI
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0x5A: 0x0396, # GREEK CAPITAL LETTER ZETA
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0x5B: 0x005B, # LEFT SQUARE BRACKET
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0x5C: 0x2234, # THEREFORE
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0x5D: 0x005D, # RIGHT SQUARE BRACKET
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0x5E: 0x22A5, # UP TACK
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0x5F: 0x005F, # LOW LINE
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0x60: 0xF8E5, # RADICAL EXTENDER (Apple PUA)
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0x61: 0x03B1, # GREEK SMALL LETTER ALPHA
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0x62: 0x03B2, # GREEK SMALL LETTER BETA
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0x63: 0x03C7, # GREEK SMALL LETTER CHI
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0x64: 0x03B4, # GREEK SMALL LETTER DELTA
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0x65: 0x03B5, # GREEK SMALL LETTER EPSILON
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0x66: 0x03C6, # GREEK SMALL LETTER PHI
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0x67: 0x03B3, # GREEK SMALL LETTER GAMMA
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0x68: 0x03B7, # GREEK SMALL LETTER ETA
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0x69: 0x03B9, # GREEK SMALL LETTER IOTA
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0x6A: 0x03D5, # GREEK PHI SYMBOL
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0x6B: 0x03BA, # GREEK SMALL LETTER KAPPA
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0x6C: 0x03BB, # GREEK SMALL LETTER LAMDA
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0x6D: 0x03BC, # GREEK SMALL LETTER MU
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0x6E: 0x03BD, # GREEK SMALL LETTER NU
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0x6F: 0x03BF, # GREEK SMALL LETTER OMICRON
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0x70: 0x03C0, # GREEK SMALL LETTER PI
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0x71: 0x03B8, # GREEK SMALL LETTER THETA
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0x72: 0x03C1, # GREEK SMALL LETTER RHO
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0x73: 0x03C3, # GREEK SMALL LETTER SIGMA
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0x74: 0x03C4, # GREEK SMALL LETTER TAU
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0x75: 0x03C5, # GREEK SMALL LETTER UPSILON
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0x76: 0x03D6, # GREEK PI SYMBOL
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0x77: 0x03C9, # GREEK SMALL LETTER OMEGA
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0x78: 0x03BE, # GREEK SMALL LETTER XI
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0x79: 0x03C8, # GREEK SMALL LETTER PSI
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0x7A: 0x03B6, # GREEK SMALL LETTER ZETA
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0x7B: 0x007B, # LEFT CURLY BRACKET
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0x7C: 0x007C, # VERTICAL LINE
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0x7D: 0x007D, # RIGHT CURLY BRACKET
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0x7E: 0x223C, # TILDE OPERATOR
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0xA0: 0x20AC, # EURO SIGN
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0xA1: 0x03D2, # GREEK UPSILON WITH HOOK SYMBOL
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0xA2: 0x2032, # PRIME
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0xA3: 0x2264, # LESS-THAN OR EQUAL TO
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0xA4: 0x2044, # FRACTION SLASH
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0xA5: 0x221E, # INFINITY
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0xA6: 0x0192, # LATIN SMALL LETTER F WITH HOOK
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0xA7: 0x2663, # BLACK CLUB SUIT
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0xA8: 0x2666, # BLACK DIAMOND SUIT
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0xA9: 0x2665, # BLACK HEART SUIT
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0xAA: 0x2660, # BLACK SPADE SUIT
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0xAB: 0x2194, # LEFT RIGHT ARROW
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0xAC: 0x2190, # LEFTWARDS ARROW
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0xAD: 0x2191, # UPWARDS ARROW
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0xAE: 0x2192, # RIGHTWARDS ARROW
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0xAF: 0x2193, # DOWNWARDS ARROW
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0xB0: 0x00B0, # DEGREE SIGN
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0xB1: 0x00B1, # PLUS-MINUS SIGN
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0xB2: 0x2033, # DOUBLE PRIME
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0xB3: 0x2265, # GREATER-THAN OR EQUAL TO
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0xB4: 0x00D7, # MULTIPLICATION SIGN
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0xB5: 0x221D, # PROPORTIONAL TO
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0xB6: 0x2202, # PARTIAL DIFFERENTIAL
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0xB7: 0x2022, # BULLET
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0xB8: 0x00F7, # DIVISION SIGN
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0xB9: 0x2260, # NOT EQUAL TO
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0xBA: 0x2261, # IDENTICAL TO
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0xBB: 0x2248, # ALMOST EQUAL TO
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0xBC: 0x2026, # HORIZONTAL ELLIPSIS
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0xBD: 0x23D0, # VERTICAL LINE EXTENSION
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0xBE: 0x23AF, # HORIZONTAL LINE EXTENSION
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0xBF: 0x21B5, # DOWNWARDS ARROW WITH CORNER LEFTWARDS
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0xC0: 0x2135, # ALEF SYMBOL
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0xC1: 0x2111, # BLACK-LETTER CAPITAL I
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0xC2: 0x211C, # BLACK-LETTER CAPITAL R
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0xC3: 0x2118, # SCRIPT CAPITAL P (Weierstrass)
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0xC4: 0x2297, # CIRCLED TIMES
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0xC5: 0x2295, # CIRCLED PLUS
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0xC6: 0x2205, # EMPTY SET
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0xC7: 0x2229, # INTERSECTION
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0xC8: 0x222A, # UNION
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0xC9: 0x2283, # SUPERSET OF
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0xCA: 0x2287, # SUPERSET OF OR EQUAL TO
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0xCB: 0x2284, # NOT A SUBSET OF
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0xCC: 0x2282, # SUBSET OF
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0xCD: 0x2286, # SUBSET OF OR EQUAL TO
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0xCE: 0x2208, # ELEMENT OF
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0xCF: 0x2209, # NOT AN ELEMENT OF
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0xD0: 0x2220, # ANGLE
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0xD1: 0x2207, # NABLA
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0xD2: 0x00AE, # REGISTERED SIGN (also at 0xE2)
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0xD3: 0x00A9, # COPYRIGHT SIGN (also at 0xE3)
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0xD4: 0x2122, # TRADE MARK SIGN (also at 0xE4)
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0xD5: 0x220F, # N-ARY PRODUCT
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0xD6: 0x221A, # SQUARE ROOT
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0xD7: 0x22C5, # DOT OPERATOR
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0xD8: 0x00AC, # NOT SIGN
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0xD9: 0x2227, # LOGICAL AND
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0xDA: 0x2228, # LOGICAL OR
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0xDB: 0x21D4, # LEFT RIGHT DOUBLE ARROW
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0xDC: 0x21D0, # LEFTWARDS DOUBLE ARROW
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0xDD: 0x21D1, # UPWARDS DOUBLE ARROW
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0xDE: 0x21D2, # RIGHTWARDS DOUBLE ARROW
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0xDF: 0x21D3, # DOWNWARDS DOUBLE ARROW
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0xE0: 0x25CA, # LOZENGE
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0xE1: 0x3008, # LEFT ANGLE BRACKET
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0xE2: 0x00AE, # REGISTERED SIGN (duplicate)
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0xE3: 0x00A9, # COPYRIGHT SIGN (duplicate)
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0xE4: 0x2122, # TRADE MARK SIGN (duplicate)
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0xE5: 0x2211, # N-ARY SUMMATION
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0xE6: 0x239B, # LEFT PARENTHESIS UPPER HOOK
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0xE7: 0x239C, # LEFT PARENTHESIS EXTENSION
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0xE8: 0x239D, # LEFT PARENTHESIS LOWER HOOK
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0xE9: 0x23A1, # LEFT SQUARE BRACKET UPPER CORNER
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0xEA: 0x23A2, # LEFT SQUARE BRACKET EXTENSION
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0xEB: 0x23A3, # LEFT SQUARE BRACKET LOWER CORNER
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0xEC: 0x23A7, # LEFT CURLY BRACKET UPPER HOOK
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0xED: 0x23A8, # LEFT CURLY BRACKET MIDDLE PIECE
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0xEE: 0x23A9, # LEFT CURLY BRACKET LOWER HOOK
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0xEF: 0x23AA, # CURLY BRACKET EXTENSION
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0xF0: 0xF8FF, # Apple logo (Apple PUA)
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0xF1: 0x3009, # RIGHT ANGLE BRACKET
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0xF2: 0x222B, # INTEGRAL
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0xF3: 0x2320, # TOP HALF INTEGRAL
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0xF4: 0x23AE, # INTEGRAL EXTENSION
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0xF5: 0x2321, # BOTTOM HALF INTEGRAL
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0xF6: 0x239E, # RIGHT PARENTHESIS UPPER HOOK
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0xF7: 0x239F, # RIGHT PARENTHESIS EXTENSION
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0xF8: 0x23A0, # RIGHT PARENTHESIS LOWER HOOK
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0xF9: 0x23A4, # RIGHT SQUARE BRACKET UPPER CORNER
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0xFA: 0x23A5, # RIGHT SQUARE BRACKET EXTENSION
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0xFB: 0x23A6, # RIGHT SQUARE BRACKET LOWER CORNER
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0xFC: 0x23AB, # RIGHT CURLY BRACKET UPPER HOOK
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0xFD: 0x23AC, # RIGHT CURLY BRACKET MIDDLE PIECE
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0xFE: 0x23AD, # RIGHT CURLY BRACKET LOWER HOOK
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0xFF: 0x23AF, # HORIZONTAL LINE EXTENSION (duplicate of 0xBE)
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}
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# Some codepoints in the Apple Symbol table map to the same Unicode value
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# (e.g., 0xD2 and 0xE2 both map to U+00AE). When building the reverse
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# mapping we can't distinguish them, but the font has separate glyphs at
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# both PUA positions. For the duplicates (0xD2/0xE2, 0xD3/0xE3, 0xD4/0xE4,
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# 0xBE/0xFF), textutil seems to always produce the Unicode codepoint, so
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# we'll map it to the lower byte position (0xD2, 0xD3, 0xD4, 0xBE).
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# If the higher position glyph is needed, the font's fallback will handle it.
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def build_unicode_to_pua_map():
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"""Build the reverse mapping: Unicode codepoint → PUA codepoint (U+F0xx).
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For each byte value in the Symbol encoding, the font stores its glyph at
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U+F000 + byte. textutil converted byte → Unicode via the Symbol table.
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We reverse that: Unicode → U+F000 + byte.
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"""
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unicode_to_pua = {}
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for byte_val, unicode_cp in APPLE_SYMBOL_BYTE_TO_UNICODE.items():
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pua_cp = 0xF000 + byte_val
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# For duplicates, prefer the lower byte (first occurrence wins)
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if unicode_cp not in unicode_to_pua:
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unicode_to_pua[unicode_cp] = pua_cp
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# Also handle U+F87F which appears in some files — this is Apple PUA for
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# the "delete" character (byte 0x7F), which isn't in the standard Symbol
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# table but textutil sometimes emits it
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unicode_to_pua[0xF87F] = 0xF07F
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# U+F8E5 (radical extender) maps to byte 0x60
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unicode_to_pua[0xF8E5] = 0xF060
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return unicode_to_pua
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def find_inben_classes(html: str) -> set:
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"""Find all CSS class names that reference Inben* fonts."""
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# Match class definitions in <style> like: p.p29 {...font: 18.0px Inbenr...}
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classes = set()
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for m in re.finditer(r"p\.(p\d+)\s*\{[^}]*font:\s*[^}]*Inben[a-z]*[^}]*\}", html):
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classes.add(m.group(1))
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return classes
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def find_inben_span_classes(html: str) -> set:
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"""Find all span CSS class names that reference Inben* fonts."""
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classes = set()
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for m in re.finditer(
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r"span\.(s\d+)\s*\{[^}]*font:\s*[^}]*Inben[a-z]*[^}]*\}", html
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):
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classes.add(m.group(1))
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return classes
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def remap_text(text: str, unicode_to_pua: dict) -> str:
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"""Remap Symbol-encoded Unicode codepoints to PUA codepoints."""
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result = []
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for ch in text:
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cp = ord(ch)
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if cp in unicode_to_pua:
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result.append(chr(unicode_to_pua[cp]))
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else:
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result.append(ch)
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return "".join(result)
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def fix_bengali_encoding(html: str) -> str:
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"""Fix Bengali font encoding in the HTML by remapping codepoints.
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Strategy: We can't use BeautifulSoup because it would re-serialize the
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entire HTML and potentially break formatting. Instead, we use regex to
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find <p> and <span> tags with Bengali font classes and remap only their
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text content, preserving all HTML tags and attributes inside them.
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"""
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unicode_to_pua = build_unicode_to_pua_map()
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inben_p_classes = find_inben_classes(html)
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inben_s_classes = find_inben_span_classes(html)
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if not inben_p_classes and not inben_s_classes:
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print("WARNING: No Inben* font classes found in CSS!")
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return html
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print(f"Found Bengali font <p> classes: {sorted(inben_p_classes)}")
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print(f"Found Bengali font <span> classes: {sorted(inben_s_classes)}")
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# Build a regex pattern that matches <p class="pXX"> ... </p> for Bengali classes
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# We need to handle nested tags (like <br>, <span>, <b>, <i>) inside the <p>.
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# The approach: match the opening tag, then remap characters in the content
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# while preserving HTML tags.
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p_class_pattern = "|".join(re.escape(c) for c in sorted(inben_p_classes))
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s_class_pattern = (
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"|".join(re.escape(c) for c in sorted(inben_s_classes))
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if inben_s_classes
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else None
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)
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total_remapped = 0
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def remap_tag_content(m):
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"""Remap text content inside a tag, preserving inner HTML tags."""
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nonlocal total_remapped
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full_match = m.group(0)
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opening_tag = m.group(1)
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inner = m.group(2)
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closing_tag = m.group(3)
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# Remap only text nodes (not HTML tags)
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def remap_text_nodes(inner_html):
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nonlocal total_remapped
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parts = re.split(r"(<[^>]+>)", inner_html)
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result = []
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for part in parts:
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if part.startswith("<"):
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# HTML tag — preserve as-is
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result.append(part)
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else:
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# Text node — remap codepoints
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remapped = remap_text(part, unicode_to_pua)
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if remapped != part:
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total_remapped += sum(
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1 for a, b in zip(part, remapped) if a != b
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)
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result.append(remapped)
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return "".join(result)
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new_inner = remap_text_nodes(inner)
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return f"{opening_tag}{new_inner}{closing_tag}"
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# Fix <p class="pXX"> tags
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if p_class_pattern:
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pattern = re.compile(
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rf"(<p\s+class=\"(?:{p_class_pattern})\"[^>]*>)(.*?)(</p>)",
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||||
re.DOTALL,
|
||||
)
|
||||
html = pattern.sub(remap_tag_content, html)
|
||||
|
||||
# Fix <span class="sXX"> tags with Bengali fonts
|
||||
if s_class_pattern:
|
||||
pattern = re.compile(
|
||||
rf"(<span\s+class=\"(?:{s_class_pattern})\"[^>]*>)(.*?)(</span>)",
|
||||
re.DOTALL,
|
||||
)
|
||||
html = pattern.sub(remap_tag_content, html)
|
||||
|
||||
print(f"Remapped {total_remapped} characters")
|
||||
return html
|
||||
|
||||
|
||||
def main():
|
||||
base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
|
||||
html_path = os.path.join(base_dir, "public", "html", "cc.html")
|
||||
|
||||
if not os.path.exists(html_path):
|
||||
print(f"ERROR: {html_path} not found!")
|
||||
sys.exit(1)
|
||||
|
||||
print(f"Reading {html_path}...")
|
||||
with open(html_path, "r", encoding="utf-8") as f:
|
||||
html = f.read()
|
||||
|
||||
print(f"File size: {len(html):,} bytes")
|
||||
print()
|
||||
|
||||
# --- Verify the font files exist and have PUA mappings ---
|
||||
fonts_dir = os.path.join(base_dir, "public", "fonts")
|
||||
for font_name in ["inbenr11.ttf", "inbeni11.ttf", "inbenb11.ttf", "inbeno11.ttf"]:
|
||||
font_path = os.path.join(fonts_dir, font_name)
|
||||
if os.path.exists(font_path):
|
||||
print(f" ✓ Font found: {font_name}")
|
||||
else:
|
||||
print(f" ✗ Font MISSING: {font_name}")
|
||||
|
||||
print()
|
||||
|
||||
# --- Fix the encoding ---
|
||||
fixed_html = fix_bengali_encoding(html)
|
||||
|
||||
# --- Verify the fix ---
|
||||
unicode_to_pua = build_unicode_to_pua_map()
|
||||
|
||||
# Count remaining Symbol-encoded chars in Bengali paragraphs
|
||||
inben_classes = find_inben_classes(fixed_html)
|
||||
remaining = 0
|
||||
for m in re.finditer(
|
||||
rf'<p\s+class="(?:{"|".join(inben_classes)})"[^>]*>(.*?)</p>',
|
||||
fixed_html,
|
||||
re.DOTALL,
|
||||
):
|
||||
inner = re.sub(r"<[^>]+>", "", m.group(1)) # strip tags
|
||||
for ch in inner:
|
||||
cp = ord(ch)
|
||||
if cp in unicode_to_pua and not (0xF000 <= cp <= 0xF0FF):
|
||||
remaining += 1
|
||||
|
||||
pua_count = 0
|
||||
for m in re.finditer(
|
||||
rf'<p\s+class="(?:{"|".join(inben_classes)})"[^>]*>(.*?)</p>',
|
||||
fixed_html,
|
||||
re.DOTALL,
|
||||
):
|
||||
inner = re.sub(r"<[^>]+>", "", m.group(1))
|
||||
for ch in inner:
|
||||
cp = ord(ch)
|
||||
if 0xF000 <= cp <= 0xF0FF:
|
||||
pua_count += 1
|
||||
|
||||
print(f"\nVerification:")
|
||||
print(f" PUA characters (correct): {pua_count:,}")
|
||||
print(f" Remaining Symbol-encoded (incorrect): {remaining:,}")
|
||||
|
||||
if remaining > 0:
|
||||
print(f"\n WARNING: {remaining} characters could not be remapped!")
|
||||
print(" These may be characters outside the Symbol encoding range.")
|
||||
|
||||
# --- Write the fixed HTML ---
|
||||
print(f"\nWriting fixed HTML to {html_path}...")
|
||||
with open(html_path, "w", encoding="utf-8") as f:
|
||||
f.write(fixed_html)
|
||||
|
||||
print("Done!")
|
||||
|
||||
# --- Quick visual check ---
|
||||
print("\n--- Sample Bengali text (first 3 paragraphs) ---")
|
||||
count = 0
|
||||
for m in re.finditer(
|
||||
rf'<p\s+class="(?:{"|".join(inben_classes)})"[^>]*>(.*?)</p>',
|
||||
fixed_html,
|
||||
re.DOTALL,
|
||||
):
|
||||
inner = re.sub(r"<[^>]+>", "", m.group(1)).strip()
|
||||
if inner and len(inner) > 10:
|
||||
# Show hex of first few chars to verify they're in PUA range
|
||||
hex_preview = " ".join(f"U+{ord(c):04X}" for c in inner[:10])
|
||||
print(f" Text: {inner[:60]}")
|
||||
print(f" Hex: {hex_preview}")
|
||||
print()
|
||||
count += 1
|
||||
if count >= 3:
|
||||
break
|
||||
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
Reference in New Issue
Block a user