| // Copyright 2010-2015, Google Inc. |
| // All rights reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following disclaimer |
| // in the documentation and/or other materials provided with the |
| // distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "rewriter/unicode_rewriter.h" |
| |
| #include <cctype> |
| #include <string> |
| |
| #include "base/logging.h" |
| #include "base/number_util.h" |
| #include "base/util.h" |
| #include "composer/composer.h" |
| #include "converter/conversion_request.h" |
| #include "converter/converter_interface.h" |
| #include "converter/segments.h" |
| |
| namespace mozc { |
| |
| UnicodeRewriter::UnicodeRewriter(const ConverterInterface *parent_converter) |
| : parent_converter_(parent_converter) { |
| DCHECK(parent_converter_); |
| } |
| |
| UnicodeRewriter::~UnicodeRewriter() {} |
| |
| namespace { |
| |
| // Checks given string is ucs4 expression or not. |
| bool IsValidUCS4Expression(const string &input) { |
| if (input.size() < 3 || input.size() > 8) { |
| return false; |
| } |
| |
| if (!Util::StartsWith(input, "U+")) { |
| return false; |
| } |
| |
| const string hexcode(input, 2, input.npos); |
| |
| for (size_t i = 0; i < hexcode.size(); ++i) { |
| if (!::isxdigit(hexcode.at(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // Converts given string to 32bit unsigned integer. |
| bool UCS4ExpressionToInteger(const string &input, uint32 *ucs4) { |
| DCHECK(ucs4); |
| const string hexcode(input, 2, input.npos); |
| return NumberUtil::SafeHexStrToUInt32(hexcode, ucs4); |
| } |
| |
| // Checks if given ucs4 value is acceptable or not. |
| bool IsAcceptableUnicode(const uint32 ucs4) { |
| // Unicode character should be less than 0x10FFFF. |
| if (ucs4 > 0x10FFFF) { |
| return false; |
| } |
| |
| // Control characters are not acceptable. 0x7F is DEL. |
| if (ucs4 < 0x20 || (0x7F <= ucs4 && ucs4 <= 0x9F)) { |
| return false; |
| } |
| |
| // Bidirectional text control are not acceptable. |
| // See: http://en.wikipedia.org/wiki/Unicode_control_characters |
| if (ucs4 == 0x200E || ucs4 == 0x200F || (0x202A <= ucs4 && ucs4 <= 0x202E)) { |
| return false; |
| } |
| |
| return true; |
| } |
| |
| void AddCandidate( |
| const string &key, const string &value, int index, Segment *segment) { |
| DCHECK(segment); |
| |
| if (index > segment->candidates_size()) { |
| index = segment->candidates_size(); |
| } |
| |
| Segment::Candidate *candidate = segment->insert_candidate(index); |
| DCHECK(candidate); |
| |
| candidate->Init(); |
| segment->set_key(key); |
| candidate->key = key; |
| candidate->value = value; |
| candidate->content_value = value; |
| // "Unicode 変換(" + key + ")" |
| candidate->description = "Unicode \xE5\xA4\x89\xE6\x8F\x9B (" + key + ")"; |
| candidate->attributes |= (Segment::Candidate::NO_LEARNING | |
| Segment::Candidate::NO_VARIANTS_EXPANSION); |
| } |
| } // namespace |
| |
| // If the key is a single unicode character, the correspoinding |
| // Unicode "U+xxxx" format is added. (ex. "A" -> "U+0041"). This is |
| // triggered on reverse conversion only. |
| bool UnicodeRewriter::RewriteToUnicodeCharFormat( |
| const ConversionRequest &request, |
| Segments *segments) const { |
| if (!request.has_composer()) { |
| return false; |
| } |
| |
| if (request.composer().source_text().empty() || |
| segments->conversion_segments_size() != 1) { |
| return false; |
| } |
| |
| const string &source_text = request.composer().source_text(); |
| const size_t source_text_size = Util::CharsLen(source_text); |
| if (source_text_size != 1) { |
| return false; |
| } |
| |
| const string &source_char = request.composer().source_text(); |
| size_t mblen = 0; |
| const char32 ucs4 = Util::UTF8ToUCS4(source_char.data(), |
| source_char.data() + source_char.size(), |
| &mblen); |
| const string value = Util::StringPrintf("U+%04X", ucs4); |
| |
| const string &key = segments->conversion_segment(0).key(); |
| Segment *segment = segments->mutable_conversion_segment(0); |
| AddCandidate(key, value, 5, segment); |
| return true; |
| } |
| |
| // If the key is in the "U+xxxx" format, the corresponding Unicode |
| // character is added. (ex. "U+0041" -> "A"). |
| bool UnicodeRewriter::RewriteFromUnicodeCharFormat( |
| const ConversionRequest &request, |
| Segments *segments) const { |
| string key; |
| for (size_t i = 0; i < segments->conversion_segments_size(); ++i) { |
| key += segments->conversion_segment(i).key(); |
| } |
| |
| if (!IsValidUCS4Expression(key)) { |
| return false; |
| } |
| |
| uint32 ucs4 = 0; |
| if (!UCS4ExpressionToInteger(key, &ucs4)) { |
| return false; |
| } |
| |
| if (!IsAcceptableUnicode(ucs4)) { |
| return false; |
| } |
| |
| string value; |
| Util::UCS4ToUTF8(ucs4, &value); |
| if (value.empty()) { |
| return false; |
| } |
| |
| if (segments->conversion_segments_size() > 1) { |
| if (segments->resized()) { |
| // The given segments are resized by user so don't modify anymore. |
| return false; |
| } |
| |
| const uint32 resize_len = Util::CharsLen(key) - |
| Util::CharsLen(segments->conversion_segment(0).key()); |
| if (!parent_converter_->ResizeSegment(segments, request, 0, resize_len)) { |
| return false; |
| } |
| } |
| DCHECK_EQ(1, segments->conversion_segments_size()); |
| |
| Segment *segment = segments->mutable_conversion_segment(0); |
| AddCandidate(key, value, 0, segment); |
| return true; |
| } |
| |
| bool UnicodeRewriter::Rewrite(const ConversionRequest &request, |
| Segments *segments) const { |
| DCHECK(segments); |
| // "A" -> "U+0041" (Reverse conversion only). |
| if (RewriteToUnicodeCharFormat(request, segments)) { |
| return true; |
| } |
| |
| // "U+0041" -> "A" |
| if (RewriteFromUnicodeCharFormat(request, segments)) { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| } // namespace mozc |