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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "char_utils.h"
     18 #include "binary_format.h"
     19 #include "defines.h"
     20 #include "digraph_utils.h"
     21 
     22 namespace latinime {
     23 
     24 const DigraphUtils::digraph_t DigraphUtils::GERMAN_UMLAUT_DIGRAPHS[] =
     25         { { 'a', 'e', 0x00E4 }, // U+00E4 : LATIN SMALL LETTER A WITH DIAERESIS
     26         { 'o', 'e', 0x00F6 },   // U+00F6 : LATIN SMALL LETTER O WITH DIAERESIS
     27         { 'u', 'e', 0x00FC } }; // U+00FC : LATIN SMALL LETTER U WITH DIAERESIS
     28 const DigraphUtils::digraph_t DigraphUtils::FRENCH_LIGATURES_DIGRAPHS[] =
     29         { { 'a', 'e', 0x00E6 }, // U+00E6 : LATIN SMALL LETTER AE
     30         { 'o', 'e', 0x0153 } }; // U+0153 : LATIN SMALL LIGATURE OE
     31 const DigraphUtils::DigraphType DigraphUtils::USED_DIGRAPH_TYPES[] =
     32         { DIGRAPH_TYPE_GERMAN_UMLAUT, DIGRAPH_TYPE_FRENCH_LIGATURES };
     33 
     34 /* static */ bool DigraphUtils::hasDigraphForCodePoint(
     35         const int dictFlags, const int compositeGlyphCodePoint) {
     36     const DigraphUtils::DigraphType digraphType = getDigraphTypeForDictionary(dictFlags);
     37     if (DigraphUtils::getDigraphForDigraphTypeAndCodePoint(digraphType, compositeGlyphCodePoint)) {
     38         return true;
     39     }
     40     return false;
     41 }
     42 
     43 // Returns the digraph type associated with the given dictionary.
     44 /* static */ DigraphUtils::DigraphType DigraphUtils::getDigraphTypeForDictionary(
     45         const int dictFlags) {
     46     if (BinaryFormat::REQUIRES_GERMAN_UMLAUT_PROCESSING & dictFlags) {
     47         return DIGRAPH_TYPE_GERMAN_UMLAUT;
     48     }
     49     if (BinaryFormat::REQUIRES_FRENCH_LIGATURES_PROCESSING & dictFlags) {
     50         return DIGRAPH_TYPE_FRENCH_LIGATURES;
     51     }
     52     return DIGRAPH_TYPE_NONE;
     53 }
     54 
     55 // Retrieves the set of all digraphs associated with the given dictionary flags.
     56 // Returns the size of the digraph array, or 0 if none exist.
     57 /* static */ int DigraphUtils::getAllDigraphsForDictionaryAndReturnSize(
     58         const int dictFlags, const DigraphUtils::digraph_t **const digraphs) {
     59     const DigraphUtils::DigraphType digraphType = getDigraphTypeForDictionary(dictFlags);
     60     return getAllDigraphsForDigraphTypeAndReturnSize(digraphType, digraphs);
     61 }
     62 
     63 // Returns the digraph codepoint for the given composite glyph codepoint and digraph codepoint index
     64 // (which specifies the first or second codepoint in the digraph).
     65 /* static */ int DigraphUtils::getDigraphCodePointForIndex(const int compositeGlyphCodePoint,
     66         const DigraphCodePointIndex digraphCodePointIndex) {
     67     if (digraphCodePointIndex == NOT_A_DIGRAPH_INDEX) {
     68         return NOT_A_CODE_POINT;
     69     }
     70     const DigraphUtils::digraph_t *const digraph =
     71             DigraphUtils::getDigraphForCodePoint(compositeGlyphCodePoint);
     72     if (!digraph) {
     73         return NOT_A_CODE_POINT;
     74     }
     75     if (digraphCodePointIndex == FIRST_DIGRAPH_CODEPOINT) {
     76         return digraph->first;
     77     } else if (digraphCodePointIndex == SECOND_DIGRAPH_CODEPOINT) {
     78         return digraph->second;
     79     }
     80     ASSERT(false);
     81     return NOT_A_CODE_POINT;
     82 }
     83 
     84 // Retrieves the set of all digraphs associated with the given digraph type.
     85 // Returns the size of the digraph array, or 0 if none exist.
     86 /* static */ int DigraphUtils::getAllDigraphsForDigraphTypeAndReturnSize(
     87         const DigraphUtils::DigraphType digraphType,
     88         const DigraphUtils::digraph_t **const digraphs) {
     89     if (digraphType == DigraphUtils::DIGRAPH_TYPE_GERMAN_UMLAUT) {
     90         *digraphs = GERMAN_UMLAUT_DIGRAPHS;
     91         return NELEMS(GERMAN_UMLAUT_DIGRAPHS);
     92     }
     93     if (digraphType == DIGRAPH_TYPE_FRENCH_LIGATURES) {
     94         *digraphs = FRENCH_LIGATURES_DIGRAPHS;
     95         return NELEMS(FRENCH_LIGATURES_DIGRAPHS);
     96     }
     97     return 0;
     98 }
     99 
    100 /**
    101  * Returns the digraph for the input composite glyph codepoint, or 0 if none exists.
    102  * compositeGlyphCodePoint: the method returns the digraph corresponding to this codepoint.
    103  */
    104 /* static */ const DigraphUtils::digraph_t *DigraphUtils::getDigraphForCodePoint(
    105         const int compositeGlyphCodePoint) {
    106     for (size_t i = 0; i < NELEMS(USED_DIGRAPH_TYPES); i++) {
    107         const DigraphUtils::digraph_t *const digraph = getDigraphForDigraphTypeAndCodePoint(
    108                 USED_DIGRAPH_TYPES[i], compositeGlyphCodePoint);
    109         if (digraph) {
    110             return digraph;
    111         }
    112     }
    113     return 0;
    114 }
    115 
    116 /**
    117  * Returns the digraph for the input composite glyph codepoint, or 0 if none exists.
    118  * digraphType: the type of digraphs supported.
    119  * compositeGlyphCodePoint: the method returns the digraph corresponding to this codepoint.
    120  */
    121 /* static */ const DigraphUtils::digraph_t *DigraphUtils::getDigraphForDigraphTypeAndCodePoint(
    122         const DigraphUtils::DigraphType digraphType, const int compositeGlyphCodePoint) {
    123     const DigraphUtils::digraph_t *digraphs = 0;
    124     const int compositeGlyphLowerCodePoint = toLowerCase(compositeGlyphCodePoint);
    125     const int digraphsSize =
    126             DigraphUtils::getAllDigraphsForDictionaryAndReturnSize(digraphType, &digraphs);
    127     for (int i = 0; i < digraphsSize; i++) {
    128         if (digraphs[i].compositeGlyph == compositeGlyphLowerCodePoint) {
    129             return &digraphs[i];
    130         }
    131     }
    132     return 0;
    133 }
    134 
    135 } // namespace latinime
    136