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/*
* Copyright (c) 2023, MacDue <macdue@dueutil.tech>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <AK/Utf8View.h>
#include <LibCore/ArgsParser.h>
#include <LibGfx/Font/OpenType/Font.h>
#include <LibGfx/Font/OpenType/Hinting/Opcodes.h>
#include <LibMain/Main.h>
using namespace OpenType::Hinting;
#define YELLOW "\e[33m"
#define CYAN "\e[36m"
#define PURPLE "\e[95m"
#define GREEN "\e[92m"
#define RESET "\e[0m"
#define GRAY "\e[90m"
struct InstructionPrinter : InstructionHandler {
InstructionPrinter(bool enable_highlighting)
: m_enable_highlighting(enable_highlighting)
{
}
void before_operation(InstructionStream& stream, Opcode opcode) override
{
if (opcode == Opcode::FDEF && stream.current_position() > 1 && m_indent_level == 1)
outln();
switch (opcode) {
case Opcode::EIF:
case Opcode::ELSE:
case Opcode::ENDF:
m_indent_level--;
break;
default:
break;
}
auto digits = int(AK::log10(float(stream.length()))) + 1;
if (m_enable_highlighting)
out(GRAY);
out("{:0{}}:", stream.current_position() - 1, digits);
if (m_enable_highlighting)
out(RESET);
out("{:{}}", ""sv, m_indent_level * 2);
}
void after_operation(InstructionStream&, Opcode opcode) override
{
switch (opcode) {
case Opcode::IF:
case Opcode::ELSE:
case Opcode::IDEF:
case Opcode::FDEF:
m_indent_level++;
break;
default:
break;
}
}
void print_number(u16 value)
{
if (m_enable_highlighting)
return out(GREEN " {}" RESET, value);
return out(" {}", value);
}
void print_bytes(ReadonlyBytes bytes, bool first = true)
{
for (auto value : bytes) {
if (!first)
out(",");
print_number(value);
first = false;
}
}
void print_words(ReadonlyBytes bytes, bool first = true)
{
for (size_t i = 0; i < bytes.size(); i += 2) {
if (!first)
out(",");
print_number(bytes[i] << 8 | bytes[i + 1]);
first = false;
}
}
void default_handler(Context context) override
{
auto instruction = context.instruction();
auto name = opcode_mnemonic(instruction.opcode());
if (m_enable_highlighting)
out(YELLOW);
out(name);
if (m_enable_highlighting)
out(CYAN);
out("[");
if (m_enable_highlighting)
out(PURPLE);
if (instruction.flag_bits() > 0)
out("{:0{}b}", to_underlying(instruction.opcode()) & ((1 << instruction.flag_bits()) - 1), instruction.flag_bits());
if (m_enable_highlighting)
out(CYAN);
out("]");
if (m_enable_highlighting)
out(RESET);
switch (instruction.opcode()) {
case Opcode::NPUSHB... Opcode::NPUSHB_MAX:
print_number(instruction.values().size());
print_bytes(instruction.values(), false);
break;
case Opcode::NPUSHW... Opcode::NPUSHW_MAX:
print_number(instruction.values().size() / 2);
print_words(instruction.values(), false);
break;
case Opcode::PUSHB... Opcode::PUSHB_MAX:
print_bytes(instruction.values());
break;
case Opcode::PUSHW... Opcode::PUSHW_MAX:
print_words(instruction.values());
break;
default:
break;
}
outln();
}
private:
bool m_enable_highlighting;
u32 m_indent_level { 1 };
};
static bool s_disassembly_attempted = false;
static void print_disassembly(StringView name, Optional<ReadonlyBytes> program, bool enable_highlighting, u32 code_point = 0)
{
s_disassembly_attempted = true;
if (!program.has_value()) {
out(name, code_point);
outln(": not found");
return;
}
out(name, code_point);
outln(": ({} bytes)\n", program->size());
InstructionPrinter printer { enable_highlighting };
InstructionStream stream { printer, *program };
while (!stream.at_end())
stream.process_next_instruction();
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
Core::ArgsParser args_parser;
StringView font_path;
bool no_color = false;
bool dump_font_program = false;
bool dump_prep_program = false;
StringView text;
args_parser.add_positional_argument(font_path, "Path to font", "FILE");
args_parser.add_option(dump_font_program, "Disassemble font program (fpgm table)", "disasm-fpgm", 'f');
args_parser.add_option(dump_prep_program, "Disassemble CVT program (prep table)", "disasm-prep", 'p');
args_parser.add_option(text, "Disassemble glyph programs", "disasm-glyphs", 'g', "text");
args_parser.add_option(no_color, "Disable syntax highlighting", "no-color", 'n');
args_parser.parse(arguments);
auto font = TRY(OpenType::Font::try_load_from_file(font_path));
if (dump_font_program)
print_disassembly("Font program"sv, font->font_program(), !no_color);
if (dump_prep_program) {
if (dump_font_program)
outln();
print_disassembly("CVT program"sv, font->control_value_program(), !no_color);
}
if (!text.is_empty()) {
Utf8View utf8_view { text };
bool first = !(dump_font_program || dump_prep_program);
for (u32 code_point : utf8_view) {
if (!first)
outln();
auto glyph_id = font->glyph_id_for_code_point(code_point);
print_disassembly("Glyph program for codepoint {}"sv, font->glyph_program(glyph_id), !no_color, code_point);
first = false;
}
}
if (!s_disassembly_attempted) {
args_parser.print_usage(stderr, arguments.strings[0]);
return 1;
}
return 0;
}
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