Aegisub/src/ass_parser.cpp

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// 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.
#include "ass_parser.h"
#include "ass_attachment.h"
#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_info.h"
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#include "ass_style.h"
#include "string_codec.h"
#include "subtitle_format.h"
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#include <libaegisub/ass/uuencode.h>
#include <libaegisub/make_unique.h>
#include <libaegisub/util.h>
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#include <algorithm>
#include <boost/algorithm/string/case_conv.hpp>
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/trim.hpp>
#include <boost/lexical_cast.hpp>
#include <boost/regex.hpp>
#include <boost/variant.hpp>
#include <unordered_map>
class AssParser::HeaderToProperty {
using field = boost::variant<
std::string ProjectProperties::*,
int ProjectProperties::*,
double ProjectProperties::*
>;
std::unordered_map<std::string, field> fields;
public:
HeaderToProperty()
: fields({
{"Automation Scripts", &ProjectProperties::automation_scripts},
{"Export Filters", &ProjectProperties::export_filters},
{"Export Encoding", &ProjectProperties::export_encoding},
{"Last Style Storage", &ProjectProperties::style_storage},
{"Audio URI", &ProjectProperties::audio_file},
{"Audio File", &ProjectProperties::audio_file},
{"Video File", &ProjectProperties::video_file},
{"Timecodes File", &ProjectProperties::timecodes_file},
{"Keyframes File", &ProjectProperties::keyframes_file},
{"Video Zoom Percent", &ProjectProperties::video_zoom},
{"Scroll Position", &ProjectProperties::scroll_position},
{"Active Line", &ProjectProperties::active_row},
{"Video Position", &ProjectProperties::video_position},
{"Video AR Mode", &ProjectProperties::ar_mode},
{"Video AR Value", &ProjectProperties::ar_value},
{"Aegisub Video Zoom Percent", &ProjectProperties::video_zoom},
{"Aegisub Scroll Position", &ProjectProperties::scroll_position},
{"Aegisub Active Line", &ProjectProperties::active_row},
{"Aegisub Video Position", &ProjectProperties::video_position}
})
{
}
bool ProcessProperty(AssFile *target, std::string const& key, std::string const& value) {
auto it = fields.find(key);
if (it != end(fields)) {
using namespace agi::util;
struct {
using result_type = void;
ProjectProperties &obj;
std::string const& value;
void operator()(std::string ProjectProperties::*f) const { obj.*f = value; }
void operator()(int ProjectProperties::*f) const { try_parse(value, &(obj.*f)); }
void operator()(double ProjectProperties::*f) const { try_parse(value, &(obj.*f)); }
} visitor {target->Properties, value};
boost::apply_visitor(visitor, it->second);
return true;
}
if (boost::starts_with(key, "Automation Settings ")) {
target->Properties.automation_settings[key.substr(strlen("Automation Settings"))] = value;
return true;
}
return false;
}
};
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AssParser::AssParser(AssFile *target, int version)
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: property_handler(agi::make_unique<HeaderToProperty>())
, target(target)
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, version(version)
, state(&AssParser::ParseScriptInfoLine)
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{
}
AssParser::~AssParser() {
}
void AssParser::ParseAttachmentLine(std::string const& data) {
bool is_filename = boost::starts_with(data, "fontname: ") || boost::starts_with(data, "filename: ");
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bool valid_data = data.size() > 0 && data.size() <= 80;
for (auto byte : data) {
if (byte < 33 || byte >= 97) {
valid_data = false;
break;
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}
}
// Data is over, add attachment to the file
if (!valid_data || is_filename) {
target->Attachments.push_back(*attach.release());
AddLine(data);
}
else {
attach->AddData(data);
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// Done building
if (data.size() < 80)
target->Attachments.push_back(*attach.release());
}
}
void AssParser::ParseScriptInfoLine(std::string const& data) {
if (boost::starts_with(data, ";")) {
// Skip stupid comments added by other programs
// Of course, we'll add our own in place later... ;)
return;
}
if (boost::starts_with(data, "ScriptType:")) {
std::string version_str = data.substr(11);
boost::trim(version_str);
boost::to_lower(version_str);
if (version_str == "v4.00")
version = 0;
else if (version_str == "v4.00+")
version = 1;
else
throw SubtitleFormatParseError("Unknown SSA file format version");
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}
// Nothing actually supports the Collisions property and malformed values
// crash VSFilter, so just remove it entirely
if (boost::starts_with(data, "Collisions:"))
return;
size_t pos = data.find(':');
if (pos == data.npos) return;
auto key = data.substr(0, pos);
auto value = data.substr(pos + 1);
boost::trim_left(value);
if (!property_handler->ProcessProperty(target, key, value))
target->Info.push_back(*new AssInfo(std::move(key), std::move(value)));
}
void AssParser::ParseMetadataLine(std::string const& data) {
size_t pos = data.find(':');
if (pos == data.npos) return;
auto key = data.substr(0, pos);
auto value = data.substr(pos + 1);
boost::trim_left(value);
property_handler->ProcessProperty(target, key, value);
}
void AssParser::ParseEventLine(std::string const& data) {
if (boost::starts_with(data, "Dialogue:") || boost::starts_with(data, "Comment:"))
target->Events.push_back(*new AssDialogue(data));
}
void AssParser::ParseStyleLine(std::string const& data) {
if (boost::starts_with(data, "Style:"))
target->Styles.push_back(*new AssStyle(data, version));
}
void AssParser::ParseFontLine(std::string const& data) {
if (boost::starts_with(data, "fontname: "))
attach = agi::make_unique<AssAttachment>(data, AssEntryGroup::FONT);
}
void AssParser::ParseGraphicsLine(std::string const& data) {
if (boost::starts_with(data, "filename: "))
attach = agi::make_unique<AssAttachment>(data, AssEntryGroup::GRAPHIC);
}
void AssParser::ParseExtradataLine(std::string const &data) {
static const boost::regex matcher("Data:[[:space:]]*(\\d+),([^,]+),(.)(.*)");
boost::match_results<std::string::const_iterator> mr;
if (boost::regex_match(data, mr, matcher)) {
auto id = boost::lexical_cast<uint32_t>(mr.str(1));
auto key = inline_string_decode(mr.str(2));
auto valuetype = mr.str(3);
auto value = mr.str(4);
if (valuetype == "e") {
// escaped/inline_string encoded
value = inline_string_decode(value);
} else if (valuetype == "u") {
// ass uuencoded
auto valuedata = agi::ass::UUDecode(value.c_str(), value.c_str() + value.size());
value = std::string(valuedata.begin(), valuedata.end());
} else {
// unknown, error?
value = "";
}
// ensure next_extradata_id is always at least 1 more than the largest existing id
target->next_extradata_id = std::max(id+1, target->next_extradata_id);
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target->Extradata.push_back(ExtradataEntry{id, std::move(key), std::move(value)});
}
}
void AssParser::AddLine(std::string const& data) {
// Special-case for attachments since a line could theoretically be both a
// valid attachment data line and a valid section header, and if an
// attachment is in progress it needs to be treated as that
if (attach.get()) {
ParseAttachmentLine(data);
return;
}
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if (data.empty()) return;
// Section header
if (data[0] == '[' && data.back() == ']') {
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// Ugly hacks to allow intermixed v4 and v4+ style sections
const std::string low = boost::to_lower_copy(data);
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if (low == "[v4 styles]") {
version = 0;
state = &AssParser::ParseStyleLine;
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}
else if (low == "[v4+ styles]") {
version = 1;
state = &AssParser::ParseStyleLine;
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}
else if (low == "[events]")
state = &AssParser::ParseEventLine;
else if (low == "[script info]")
state = &AssParser::ParseScriptInfoLine;
else if (low == "[aegisub project garbage]")
state = &AssParser::ParseMetadataLine;
else if (low == "[aegisub extradata]")
state = &AssParser::ParseExtradataLine;
else if (low == "[graphics]")
state = &AssParser::ParseGraphicsLine;
else if (low == "[fonts]")
state = &AssParser::ParseFontLine;
else
state = &AssParser::UnknownLine;
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return;
}
(this->*state)(data);
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}