Aegisub/libaegisub/ass/dialogue_parser.cpp

219 lines
6.1 KiB
C++

// Copyright (c) 2012, Thomas Goyne <plorkyeran@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Aegisub Project http://www.aegisub.org/
#include "libaegisub/ass/dialogue_parser.h"
#include "libaegisub/spellchecker.h"
#include <boost/locale/boundary/index.hpp>
#include <boost/locale/boundary/segment.hpp>
#include <boost/locale/boundary/types.hpp>
namespace {
typedef std::vector<agi::ass::DialogueToken> TokenVec;
using namespace agi::ass;
namespace dt = DialogueTokenType;
namespace ss = SyntaxStyle;
class SyntaxHighlighter {
TokenVec ranges;
std::string const& text;
agi::SpellChecker *spellchecker;
void SetStyling(size_t len, int type) {
if (ranges.size() && ranges.back().type == type)
ranges.back().length += len;
else
ranges.push_back(DialogueToken{type, len});
}
public:
SyntaxHighlighter(std::string const& text, agi::SpellChecker *spellchecker)
: text(text)
, spellchecker(spellchecker)
{ }
TokenVec Highlight(TokenVec const& tokens) {
if (tokens.empty()) return ranges;
size_t pos = 0;
for (auto tok : tokens) {
switch (tok.type) {
case dt::KARAOKE_TEMPLATE: SetStyling(tok.length, ss::KARAOKE_TEMPLATE); break;
case dt::KARAOKE_VARIABLE: SetStyling(tok.length, ss::KARAOKE_VARIABLE); break;
case dt::LINE_BREAK: SetStyling(tok.length, ss::LINE_BREAK); break;
case dt::ERROR: SetStyling(tok.length, ss::ERROR); break;
case dt::ARG: SetStyling(tok.length, ss::PARAMETER); break;
case dt::COMMENT: SetStyling(tok.length, ss::COMMENT); break;
case dt::DRAWING: SetStyling(tok.length, ss::DRAWING); break;
case dt::TEXT: SetStyling(tok.length, ss::NORMAL); break;
case dt::TAG_NAME: SetStyling(tok.length, ss::TAG); break;
case dt::OPEN_PAREN: case dt::CLOSE_PAREN: case dt::ARG_SEP: case dt::TAG_START:
SetStyling(tok.length, ss::PUNCTUATION);
break;
case dt::OVR_BEGIN: case dt::OVR_END:
SetStyling(tok.length, ss::OVERRIDE);
break;
case dt::WHITESPACE:
if (ranges.size() && ranges.back().type == ss::PARAMETER)
SetStyling(tok.length, ss::PARAMETER);
else
SetStyling(tok.length, ss::NORMAL);
break;
case dt::WORD:
if (spellchecker && !spellchecker->CheckWord(text.substr(pos, tok.length)))
SetStyling(tok.length, ss::SPELLING);
else
SetStyling(tok.length, ss::NORMAL);
break;
}
pos += tok.length;
}
return ranges;
}
};
class WordSplitter {
std::string const& text;
std::vector<DialogueToken> &tokens;
size_t pos = 0;
void SwitchTo(size_t &i, int type, size_t len) {
auto old = tokens[i];
tokens[i].type = type;
tokens[i].length = len;
if (old.length != (size_t)len) {
tokens.insert(tokens.begin() + i + 1, DialogueToken{old.type, old.length - len});
++i;
}
}
void SplitText(size_t &i) {
using namespace boost::locale::boundary;
ssegment_index map(word, text.begin() + pos, text.begin() + pos + tokens[i].length);
for (auto const& segment : map) {
auto len = static_cast<size_t>(distance(begin(segment), end(segment)));
if (segment.rule() & word_letters)
SwitchTo(i, dt::WORD, len);
else
SwitchTo(i, dt::TEXT, len);
}
}
public:
WordSplitter(std::string const& text, std::vector<DialogueToken> &tokens)
: text(text)
, tokens(tokens)
{ }
void SplitWords() {
if (tokens.empty()) return;
for (size_t i = 0; i < tokens.size(); ++i) {
size_t len = tokens[i].length;
if (tokens[i].type == dt::TEXT)
SplitText(i);
pos += len;
}
}
};
}
namespace agi {
namespace ass {
std::vector<DialogueToken> SyntaxHighlight(std::string const& text, std::vector<DialogueToken> const& tokens, SpellChecker *spellchecker) {
return SyntaxHighlighter(text, spellchecker).Highlight(tokens);
}
void MarkDrawings(std::string const& str, std::vector<DialogueToken> &tokens) {
if (tokens.empty()) return;
size_t last_ovr_end = 0;
for (size_t i = tokens.size(); i > 0; --i) {
if (tokens[i - 1].type == dt::OVR_END) {
last_ovr_end = i;
break;
}
}
size_t pos = 0;
bool in_drawing = false;
for (size_t i = 0; i < last_ovr_end; ++i) {
size_t len = tokens[i].length;
switch (tokens[i].type) {
case dt::TEXT:
if (in_drawing)
tokens[i].type = dt::DRAWING;
break;
case dt::TAG_NAME:
if (len != 1 || i + 1 >= tokens.size() || str[pos] != 'p')
break;
in_drawing = false;
if (i + 1 == last_ovr_end || tokens[i + 1].type != dt::ARG)
break;
for (size_t j = pos + len; j < pos + len + tokens[i + 1].length; ++j) {
char c = str[j];
// I have no idea why one would use leading zeros for
// the scale, but vsfilter allows it
if (c >= '1' && c <= '9')
in_drawing = true;
else if (c != '0')
break;
}
break;
default: break;
}
pos += len;
}
// VSFilter treats unclosed override blocks as plain text, so merge all
// the tokens after the last override block into a single TEXT (or DRAWING)
// token
for (size_t i = last_ovr_end; i < tokens.size(); ++i) {
switch (tokens[i].type) {
case dt::KARAOKE_TEMPLATE: break;
case dt::KARAOKE_VARIABLE: break;
case dt::LINE_BREAK: break;
default:
tokens[i].type = in_drawing ? dt::DRAWING : dt::TEXT;
if (i > 0 && tokens[i - 1].type == tokens[i].type) {
tokens[i - 1].length += tokens[i].length;
tokens.erase(tokens.begin() + i);
--i;
}
}
}
}
void SplitWords(std::string const& str, std::vector<DialogueToken> &tokens) {
MarkDrawings(str, tokens);
WordSplitter(str, tokens).SplitWords();
}
}
}