Aegisub/aegisub/src/auto4_lua_assfile.cpp

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// Copyright (c) 2006, Niels Martin Hansen
// 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 the Aegisub Group 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.
//
// Aegisub Project http://www.aegisub.org/
//
// $Id$
/// @file auto4_lua_assfile.cpp
/// @brief Lua 5.1-based scripting engine (interface to subtitle files)
/// @ingroup scripting
///
#include "config.h"
#ifdef WITH_AUTO4_LUA
#ifndef AGI_PRE
#include <assert.h>
#include <algorithm>
#include <wx/log.h>
#endif
#include <libaegisub/exception.h>
#include <libaegisub/log.h>
#include <libaegisub/scoped_ptr.h>
#include "ass_dialogue.h"
#include "ass_file.h"
#include "ass_karaoke.h"
#include "ass_override.h"
#include "ass_style.h"
#include "auto4_lua.h"
#include "utils.h"
// This must be below the headers above.
#ifdef __WINDOWS__
#include "../../contrib/lua51/src/lualib.h"
#include "../../contrib/lua51/src/lauxlib.h"
#else
#include <lua.hpp>
#endif
namespace {
void set_field(lua_State *L, const char *name, wxString const& value)
{
lua_pushstring(L, value.utf8_str());
lua_setfield(L, -2, name);
}
void set_field(lua_State *L, const char *name, const char *value)
{
lua_pushstring(L, value);
lua_setfield(L, -2, name);
}
// Userdata object must be just above the target table
void set_field(lua_State *L, const char *name, lua_CFunction value)
{
assert(lua_type(L, -2) == LUA_TUSERDATA);
lua_pushvalue(L, -2);
lua_pushcclosure(L, value, 1);
lua_setfield(L, -2, name);
}
void set_field(lua_State *L, const char *name, bool value)
{
lua_pushboolean(L, value);
lua_setfield(L, -2, name);
}
void set_field(lua_State *L, const char *name, double value)
{
lua_pushnumber(L, value);
lua_setfield(L, -2, name);
}
void set_field(lua_State *L, const char *name, int value)
{
lua_pushinteger(L, value);
lua_setfield(L, -2, name);
}
DEFINE_SIMPLE_EXCEPTION_NOINNER(BadField, Automation4::MacroRunError, "automation/macro/bad_field")
BadField bad_field(const char *expected_type, const char *name, const char *line_clasee)
{
return BadField(std::string("Invalid or missing field '") + name + "' in '" + line_clasee + "' class subtitle line (expected " + expected_type + ")");
}
wxString get_string_field(lua_State *L, const char *name, const char *line_class)
{
lua_getfield(L, -1, name);
if (!lua_isstring(L, -1))
throw bad_field("string", name, line_class);
wxString ret(lua_tostring(L, -1), wxConvUTF8);
lua_pop(L, 1);
return ret;
}
double get_double_field(lua_State *L, const char *name, const char *line_class)
{
lua_getfield(L, -1, name);
if (!lua_isnumber(L, -1))
throw bad_field("number", name, line_class);
double ret = lua_tonumber(L, -1);
lua_pop(L, 1);
return ret;
}
int get_int_field(lua_State *L, const char *name, const char *line_class)
{
lua_getfield(L, -1, name);
if (!lua_isnumber(L, -1))
throw bad_field("number", name, line_class);
int ret = lua_tointeger(L, -1);
lua_pop(L, 1);
return ret;
}
bool get_bool_field(lua_State *L, const char *name, const char *line_class)
{
lua_getfield(L, -1, name);
if (!lua_isboolean(L, -1))
throw bad_field("boolean", name, line_class);
bool ret = !!lua_toboolean(L, -1);
lua_pop(L, 1);
return ret;
}
using namespace Automation4;
template<int (LuaAssFile::*closure)(lua_State *)>
int closure_wrapper(lua_State *L)
{
return (LuaAssFile::GetObjPointer(L, lua_upvalueindex(1))->*closure)(L);
}
template<void (LuaAssFile::*closure)(lua_State *)>
int closure_wrapper_v(lua_State *L)
{
(LuaAssFile::GetObjPointer(L, lua_upvalueindex(1))->*closure)(L);
return 0;
}
int modification_mask(AssEntry *e)
{
switch (e->GetType())
{
case ENTRY_DIALOGUE: return AssFile::COMMIT_DIAG_ADDREM;
case ENTRY_STYLE: return AssFile::COMMIT_STYLES;
case ENTRY_ATTACHMENT: return AssFile::COMMIT_ATTACHMENT;
default: return AssFile::COMMIT_SCRIPTINFO;
}
}
}
namespace Automation4 {
void LuaAssFile::CheckAllowModify()
{
if (!can_modify)
luaL_error(L, "Attempt to modify subtitles in read-only feature context.");
}
void LuaAssFile::AssEntryToLua(lua_State *L, AssEntry *e)
{
lua_newtable(L);
wxString raw(e->GetEntryData());
set_field(L, "section", e->group);
set_field(L, "raw", raw);
if (StringEmptyOrWhitespace(raw)) {
set_field(L, "class", "clear");
}
else if (raw[0] == ';') {
// "text" field, same as "raw" but with semicolon stripped
set_field(L, "text", raw.Mid(1));
set_field(L, "class", "comment");
}
else if (raw[0] == '[') {
set_field(L, "class", "head");
}
else if (e->group.Lower() == "[script info]") {
set_field(L, "key", raw.BeforeFirst(':'));
set_field(L, "value", raw.AfterFirst(':'));
set_field(L, "class", "info");
}
else if (raw.Left(7).Lower() == "format:") {
// TODO: parse the format line; just use a tokenizer
set_field(L, "class", "format");
}
else if (AssDialogue *dia = dynamic_cast<AssDialogue*>(e)) {
set_field(L, "comment", dia->Comment);
set_field(L, "layer", dia->Layer);
set_field(L, "start_time", dia->Start);
set_field(L, "end_time", dia->End);
set_field(L, "style", dia->Style);
set_field(L, "actor", dia->Actor);
set_field(L, "effect", dia->Effect);
set_field(L, "margin_l", dia->Margin[0]);
set_field(L, "margin_r", dia->Margin[1]);
set_field(L, "margin_t", dia->Margin[2]);
set_field(L, "margin_b", dia->Margin[3]);
set_field(L, "text", dia->Text);
set_field(L, "class", "dialogue");
}
else if (AssStyle *sty = dynamic_cast<AssStyle*>(e)) {
set_field(L, "name", sty->name);
set_field(L, "fontname", sty->font);
set_field(L, "fontsize", sty->fontsize);
set_field(L, "color1", sty->primary.GetASSFormatted(true));
set_field(L, "color2", sty->secondary.GetASSFormatted(true));
set_field(L, "color3", sty->outline.GetASSFormatted(true));
set_field(L, "color4", sty->shadow.GetASSFormatted(true));
set_field(L, "bold", sty->bold);
set_field(L, "italic", sty->italic);
set_field(L, "underline", sty->underline);
set_field(L, "strikeout", sty->strikeout);
set_field(L, "scale_x", sty->scalex);
set_field(L, "scale_y", sty->scaley);
set_field(L, "spacing", sty->spacing);
set_field(L, "angle", sty->angle);
set_field(L, "borderstyle", sty->borderstyle);
set_field(L, "outline", sty->outline_w);
set_field(L, "shadow", sty->shadow_w);
set_field(L, "align", sty->alignment);
set_field(L, "margin_l", sty->Margin[0]);
set_field(L, "margin_r", sty->Margin[1]);
set_field(L, "margin_t", sty->Margin[2]);
set_field(L, "margin_b", sty->Margin[3]);
set_field(L, "encoding", sty->encoding);
set_field(L, "relative_to", 2);// From STS.h: "0: window, 1: video, 2: undefined (~window)"
set_field(L, "class", "style");
}
else {
set_field(L, "class", "unknown");
}
}
AssEntry *LuaAssFile::LuaToAssEntry(lua_State *L)
{
// assume an assentry table is on the top of the stack
// convert it to a real AssEntry object, and pop the table from the stack
if (!lua_istable(L, -1))
luaL_error(L, "Can't convert a non-table value to AssEntry");
lua_getfield(L, -1, "class");
if (!lua_isstring(L, -1))
luaL_error(L, "Table lacks 'class' field, can't convert to AssEntry");
wxString lclass(lua_tostring(L, -1), wxConvUTF8);
lclass.MakeLower();
lua_pop(L, 1);
AssEntry *result = 0;
try {
wxString section = get_string_field(L, "section", "common");
if (lclass == "clear")
result = new AssEntry("", "");
else if (lclass == "comment")
result = new AssEntry(";" + get_string_field(L, "text", "comment"), section);
else if (lclass == "head")
result = new AssEntry(section, section);
else if (lclass == "info") {
result = new AssEntry(wxString::Format("%s: %s", get_string_field(L, "key", "info"), get_string_field(L, "value", "info")), "[Script Info]");
}
else if (lclass == "format") {
// ohshi- ...
// *FIXME* maybe ignore the actual data and just put some default stuff based on section?
result = new AssEntry("Format: Auto4,Is,Broken", section);
}
else if (lclass == "style") {
AssStyle *sty = new AssStyle;
result = sty;
sty->name = get_string_field(L, "name", "style");
sty->font = get_string_field(L, "fontname", "style");
sty->fontsize = get_double_field(L, "fontsize", "style");
sty->primary.Parse(get_string_field(L, "color1", "style"));
sty->secondary.Parse(get_string_field(L, "color2", "style"));
sty->outline.Parse(get_string_field(L, "color3", "style"));
sty->shadow.Parse(get_string_field(L, "color4", "style"));
sty->bold = get_bool_field(L, "bold", "style");
sty->italic = get_bool_field(L, "italic", "style");
sty->underline = get_bool_field(L, "underline", "style");
sty->strikeout = get_bool_field(L, "strikeout", "style");
sty->scalex = get_double_field(L, "scale_x", "style");
sty->scaley = get_double_field(L, "scale_y", "style");
sty->spacing = get_double_field(L, "spacing", "style");
sty->angle = get_double_field(L, "angle", "style");
sty->borderstyle = get_int_field(L, "borderstyle", "style");
sty->outline_w = get_double_field(L, "outline", "style");
sty->shadow_w = get_double_field(L, "shadow", "style");
sty->alignment = get_int_field(L, "align", "style");
sty->Margin[0] = get_int_field(L, "margin_l", "style");
sty->Margin[1] = get_int_field(L, "margin_r", "style");
sty->Margin[2] = get_int_field(L, "margin_t", "style");
sty->Margin[3] = get_int_field(L, "margin_b", "style");
sty->encoding = get_int_field(L, "encoding", "style");
sty->UpdateData();
}
else if (lclass == "dialogue") {
AssDialogue *dia = new AssDialogue;
result = dia;
dia->Comment = get_bool_field(L, "comment", "dialogue");
dia->Layer = get_int_field(L, "layer", "dialogue");
dia->Start = get_int_field(L, "start_time", "dialogue");
dia->End = get_int_field(L, "end_time", "dialogue");
dia->Style = get_string_field(L, "style", "dialogue");
dia->Actor = get_string_field(L, "actor", "dialogue");
dia->Margin[0] = get_int_field(L, "margin_l", "dialogue");
dia->Margin[1] = get_int_field(L, "margin_r", "dialogue");
dia->Margin[2] = get_int_field(L, "margin_t", "dialogue");
dia->Margin[3] = get_int_field(L, "margin_b", "dialogue");
dia->Effect = get_string_field(L, "effect", "dialogue");
dia->Text = get_string_field(L, "text", "dialogue");
}
else {
luaL_error(L, "Found line with unknown class: %s", lclass.utf8_str().data());
return 0;
}
return result;
}
catch (agi::Exception const& e) {
delete result;
luaL_error(L, e.GetMessage().c_str());
return 0;
}
}
void LuaAssFile::SeekCursorTo(int n)
{
if (n <= 0 || n > (int)lines.size())
luaL_error(L, "Requested out-of-range line from subtitle file: %d", n);
if (n < last_entry_id - n) {
// fastest to search from start
last_entry_ptr = lines.begin();
last_entry_id = 1;
}
else if ((int)lines.size() - last_entry_id < abs(last_entry_id - n)) {
// fastest to search from end
last_entry_ptr = lines.end();
last_entry_id = lines.size() + 1;
}
// otherwise fastest to search from cursor
advance(last_entry_ptr, n - last_entry_id);
last_entry_id = n;
}
int LuaAssFile::ObjectIndexRead(lua_State *L)
{
switch (lua_type(L, 2)) {
case LUA_TNUMBER:
// read an indexed AssEntry
SeekCursorTo(lua_tointeger(L, 2));
AssEntryToLua(L, *last_entry_ptr);
return 1;
case LUA_TSTRING:
{
// either return n or a function doing further stuff
const char *idx = lua_tostring(L, 2);
if (strcmp(idx, "n") == 0) {
// get number of items
lua_pushnumber(L, lines.size());
return 1;
}
lua_pushvalue(L, 1);
if (strcmp(idx, "delete") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectDelete>, 1);
else if (strcmp(idx, "deleterange") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectDeleteRange>, 1);
else if (strcmp(idx, "insert") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectInsert>, 1);
else if (strcmp(idx, "append") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectAppend>, 1);
else {
// idiot
lua_pop(L, 1);
return luaL_error(L, "Invalid indexing in Subtitle File object: '%s'", idx);
}
return 1;
}
default:
// crap, user is stupid!
return luaL_error(L, "Attempt to index a Subtitle File object with value of type '%s'.", lua_typename(L, lua_type(L, 2)));
}
assert(false);
return 0;
}
void LuaAssFile::ObjectIndexWrite(lua_State *L)
{
// instead of implementing everything twice, just call the other modification-functions from here
// after modifying the stack to match their expectations
CheckAllowModify();
int n = luaL_checkint(L, 2);
if (n < 0) {
// insert line so new index is n
lua_remove(L, 1);
lua_pushinteger(L, -n);
lua_replace(L, 1);
ObjectInsert(L);
}
else if (n == 0) {
// append line to list
lua_remove(L, 1);
lua_remove(L, 1);
ObjectAppend(L);
}
else {
// replace line at index n or delete
if (!lua_isnil(L, 3)) {
// insert
AssEntry *e = LuaToAssEntry(L);
modification_type |= modification_mask(e);
SeekCursorTo(n);
lines_to_delete.push_back(*last_entry_ptr);
*last_entry_ptr = e;
}
else {
// delete
lua_remove(L, 1);
lua_remove(L, 1);
ObjectDelete(L);
}
}
}
int LuaAssFile::ObjectGetLen(lua_State *L)
{
lua_pushnumber(L, lines.size());
return 1;
}
void LuaAssFile::ObjectDelete(lua_State *L)
{
CheckAllowModify();
// get number of items to delete
int itemcount = lua_gettop(L);
std::vector<int> ids;
ids.reserve(itemcount);
while (itemcount > 0) {
int n = luaL_checkint(L, itemcount);
luaL_argcheck(L, n > 0 && n <= (int)lines.size(), itemcount, "Out of range line index");
ids.push_back(n);
--itemcount;
}
// sort the item id's so we can delete from last to first to preserve original numbering
sort(ids.begin(), ids.end());
// now delete the id's backwards
SeekCursorTo(ids.back());
for (size_t i = ids.size(); i > 0; --i) {
while (last_entry_id > ids[i - 1]) {
--last_entry_ptr;
--last_entry_id;
}
modification_type |= modification_mask(*last_entry_ptr);
lines_to_delete.push_back(*last_entry_ptr);
lines.erase(last_entry_ptr++);
}
}
void LuaAssFile::ObjectDeleteRange(lua_State *L)
{
CheckAllowModify();
int a = std::max<int>(luaL_checkinteger(L, 1), 1);
int b = std::min<int>(luaL_checkinteger(L, 2), lines.size());
SeekCursorTo(a);
while (a++ <= b) {
modification_type |= modification_mask(*last_entry_ptr);
lines_to_delete.push_back(*last_entry_ptr);
lines.erase(last_entry_ptr++);
}
}
void LuaAssFile::ObjectAppend(lua_State *L)
{
CheckAllowModify();
int n = lua_gettop(L);
if (last_entry_ptr != lines.begin()) {
last_entry_ptr--;
last_entry_id--;
}
for (int i = 1; i <= n; i++) {
lua_pushvalue(L, i);
AssEntry *e = LuaToAssEntry(L);
modification_type |= modification_mask(e);
// Find the appropriate place to put it
std::list<AssEntry*>::iterator it = lines.end();
if (!lines.empty()) {
do {
--it;
}
while (it != lines.begin() && (*it)->group != e->group);
}
if (it == lines.end() || (*it)->group != e->group) {
// The new entry belongs to a group that doesn't exist yet, so
// create it at the end of the file
if (e->GetEntryData() != e->group) {
// Add the header if the entry being added isn't a header
lines.push_back(new AssEntry(e->group, e->group));
}
lines.push_back(e);
}
else {
// Append the entry to the end of the existing group
++it;
lines.insert(it, e);
}
}
// If last_entry_ptr is end, the file was empty but no longer is, so
// last_entry_id is wrong
if (last_entry_ptr == lines.end())
last_entry_id = lines.size() + 1;
}
void LuaAssFile::ObjectInsert(lua_State *L)
{
CheckAllowModify();
int before = luaL_checkinteger(L, 1);
// + 1 to allow appending at the end of the file
luaL_argcheck(L, before > 0 && before <= (int)lines.size() + 1, 1,
"Out of range line index");
if (before == (int)lines.size() + 1) {
lua_remove(L, 1);
ObjectAppend(L);
return;
}
SeekCursorTo(before);
int n = lua_gettop(L);
for (int i = 2; i <= n; i++) {
lua_pushvalue(L, i);
AssEntry *e = LuaToAssEntry(L);
modification_type |= modification_mask(e);
lines.insert(last_entry_ptr, e);
lua_pop(L, 1);
}
last_entry_id += n - 1;
}
void LuaAssFile::ObjectGarbageCollect(lua_State *L)
{
references--;
if (!references) delete this;
LOG_D("automation/lua") << "Garbage collected LuaAssFile";
}
int LuaAssFile::LuaParseKaraokeData(lua_State *L)
{
agi::scoped_ptr<AssEntry> e(LuaToAssEntry(L));
AssDialogue *dia = dynamic_cast<AssDialogue*>(e.get());
luaL_argcheck(L, dia, 1, "Subtitle line must be a dialogue line");
int idx = 0;
// 2.1.x stored everything before the first syllable at index zero
// There's no longer any such thing with the new parser, but scripts
// may rely on kara[0] existing so add an empty syllable
lua_newtable(L);
set_field(L, "duration", 0);
set_field(L, "start_time", 0);
set_field(L, "end_time", 0);
set_field(L, "tag", "");
set_field(L, "text", "");
set_field(L, "text_stripped", "");
lua_rawseti(L, -2, idx++);
AssKaraoke kara(dia, false, false);
for (AssKaraoke::iterator it = kara.begin(); it != kara.end(); ++it) {
lua_newtable(L);
set_field(L, "duration", it->duration);
set_field(L, "start_time", it->start_time - dia->Start);
set_field(L, "end_time", it->start_time + it->duration - dia->Start);
set_field(L, "tag", it->tag_type);
set_field(L, "text", it->GetText(false));
set_field(L, "text_stripped", it->text);
lua_rawseti(L, -2, idx++);
}
return 1;
}
void LuaAssFile::LuaSetUndoPoint(lua_State *L)
{
if (!can_set_undo)
luaL_error(L, "Attempt to set an undo point in a context where it makes no sense to do so.");
if (modification_type) {
pending_commits.push_back(PendingCommit());
PendingCommit& back = pending_commits.back();
back.modification_type = modification_type;
back.mesage = wxString(luaL_checkstring(L, 1), wxConvUTF8);
back.lines = lines;
modification_type = 0;
}
}
LuaAssFile *LuaAssFile::GetObjPointer(lua_State *L, int idx)
{
assert(lua_type(L, idx) == LUA_TUSERDATA);
void *ud = lua_touserdata(L, idx);
return *((LuaAssFile**)ud);
}
void LuaAssFile::ProcessingComplete(wxString const& undo_description)
{
// Apply any pending commits
for (std::deque<PendingCommit>::iterator it = pending_commits.begin(); it != pending_commits.end(); ++it) {
swap(ass->Line, it->lines);
ass->Commit(it->mesage, it->modification_type);
}
// Commit any changes after the last undo point was set
if (modification_type)
swap(ass->Line, lines);
if (modification_type && can_set_undo && !undo_description.empty())
ass->Commit(undo_description, modification_type);
delete_clear(lines_to_delete);
references--;
if (!references) delete this;
}
void LuaAssFile::Cancel()
{
references--;
if (!references) delete this;
}
LuaAssFile::LuaAssFile(lua_State *L, AssFile *ass, bool can_modify, bool can_set_undo)
: ass(ass)
, L(L)
, can_modify(can_modify)
, can_set_undo(can_set_undo)
, modification_type(0)
, references(2)
, lines(ass->Line)
, last_entry_ptr(lines.begin())
, last_entry_id(1)
{
// prepare userdata object
*static_cast<LuaAssFile**>(lua_newuserdata(L, sizeof(LuaAssFile**))) = this;
// make the metatable
lua_newtable(L);
set_field(L, "__index", closure_wrapper<&LuaAssFile::ObjectIndexRead>);
set_field(L, "__newindex", closure_wrapper_v<&LuaAssFile::ObjectIndexWrite>);
set_field(L, "__len", closure_wrapper<&LuaAssFile::ObjectGetLen>);
set_field(L, "__gc", closure_wrapper_v<&LuaAssFile::ObjectGarbageCollect>);
lua_setmetatable(L, -2);
// register misc functions
// assume the "aegisub" global table exists
lua_getglobal(L, "aegisub");
set_field(L, "parse_karaoke_data", closure_wrapper<&LuaAssFile::LuaParseKaraokeData>);
set_field(L, "set_undo_point", closure_wrapper_v<&LuaAssFile::LuaSetUndoPoint>);
lua_pop(L, 1); // pop "aegisub" table
// Leaves userdata object on stack
}
}
#endif // WITH_AUTO4_LUA