[5279] | 1 | /* |
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| 2 | * Copyright (c) 2017 International Characters. |
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| 3 | * This software is licensed to the public under the Open Software License 3.0. |
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| 4 | * icgrep is a trademark of International Characters. |
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| 5 | */ |
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| 6 | |
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| 7 | |
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| 8 | #include "alphabet.h" |
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| 9 | |
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| 10 | |
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| 11 | // Default implementation for simple Unicode subsets. The codepoint value |
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| 12 | // of the nth character is just the given value n, if it is in range. |
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| 13 | |
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| 14 | UCD::codepoint_t Alphabet::toUnicode(unsigned n) { |
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| 15 | UCD::codepoint_t cp = n; |
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| 16 | if (mCharSet.contains(cp)) return cp; |
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| 17 | throw std::runtime_error("toUnicode: n too large."); |
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| 18 | } |
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| 19 | |
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| 20 | // Default implementation for simple Unicode subsets. The ord value |
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| 21 | // of a Unicode codepoint is just the given codepoint, if it is in range. |
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| 22 | |
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| 23 | unsigned Alphabet::fromUnicode(UCD::codepoint_t codepoint) { |
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| 24 | if (mCharSet.contains(codepoint)) return codepoint; |
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| 25 | throw std::runtime_error("fromUnicode: codepoint not found in alphabet."); |
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| 26 | } |
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| 27 | |
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| 28 | |
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| 29 | template <class uint_t> ExtendedASCII<uint_t>::ExtendedASCII(std::string alphabetName, const uint_t (& extendedTable)[128]) { |
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| 30 | mAlphabetName = alphabetName; |
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| 31 | mExtendedCharacterTable = extendedTable; |
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| 32 | mCharSet = UCD::UnicodeSet(0, 127); |
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| 33 | for (unsigned i = 0; i < 128; i++) { |
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| 34 | mCharSet.insert(extendedTable[i]); |
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| 35 | } |
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| 36 | } |
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| 37 | |
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| 38 | template <class uint_t> UCD::codepoint_t ExtendedASCII<uint_t>::toUnicode(unsigned n) { |
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| 39 | // The first 128 characters are just ASCII. |
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| 40 | if (n < 128) return n; |
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| 41 | if (n < 256) return mExtendedCharacterTable[n-128]; |
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| 42 | throw std::runtime_error("toUnicode: n too large."); |
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| 43 | } |
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| 44 | |
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| 45 | template <class uint_t> unsigned ExtendedASCII<uint_t>::fromUnicode(UCD::codepoint_t codepoint) { |
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| 46 | if (codepoint < 128) return codepoint; |
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| 47 | for (unsigned i = 0; i < 128; i++) { |
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| 48 | if (mExtendedCharacterTable[i] == codepoint) return i + 128; |
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| 49 | } |
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| 50 | throw std::runtime_error("fromUnicode: codepoint not found in alphabet."); |
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| 51 | } |
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| 52 | |
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