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LibPDF: Parse graphics commands

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Matthew Olsson 2021-05-10 10:39:19 -07:00 committed by Andreas Kling
parent 03649f85e2
commit 101639e526
Notes: sideshowbarker 2024-07-18 17:51:26 +09:00 
Author: https://github.com/mattco98
Commit: https://github.com/SerenityOS/serenity/commit/101639e5262
Pull-request: https://github.com/SerenityOS/serenity/pull/7018
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/bcoles
Reviewed-by: https://github.com/tomuta
3 changed files with 190 additions and 0 deletions
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137
Userland/Libraries/LibPDF/Command.h Normal file
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@ -0,0 +1,137 @@
/*
* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Format.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <LibPDF/Value.h>
#define ENUMERATE_COMMANDS(V) \
V(SaveState, save_state, q) \
V(RestoreState, restore_state, Q) \
V(ConcatenateMatrix, concatenate_matrix, cm) \
V(SetLineWidth, set_line_width, w) \
V(SetLineCap, set_line_cap, J) \
V(SetLineJoin, set_line_join, j) \
V(SetMiterLimit, set_miter_limit, M) \
V(SetDashPattern, set_dash_pattern, d) \
V(PathBegin, path_begin, m) \
V(PathEnd, path_end, n) \
V(PathLine, path_line, l) \
V(PathClose, path_close, h) \
V(PathAppendRect, path_append_rect, re) \
V(PathStroke, path_stroke, S) \
V(PathCloseAndStroke, path_close_and_stroke, s) \
V(PathFillNonZero, path_fill_nonzero, f) \
V(PathFillNonZeroDeprecated, path_fill_nonzero_deprecated, F) \
V(PathFillEvenOdd, path_fill_evenodd, f*) \
V(PathFillStrokeNonZero, path_fill_stroke_nonzero, B) \
V(PathFillStrokeEvenOdd, path_fill_stroke_evenodd, B*) \
V(PathCloseFillStrokeNonZero, path_close_fill_stroke_nonzero, b) \
V(PathCloseFillStrokeEvenOdd, path_close_fill_stroke_evenodd, b*) \
V(TextSetCharSpace, text_set_char_space, Tc) \
V(TextSetWordSpace, text_set_word_space, Tw) \
V(TextSetHorizontalScale, text_set_horizontal_scale, Tz) \
V(TextSetLeading, text_set_leading, TL) \
V(TextSetFont, text_set_font, Tf) \
V(TextSetRenderingMode, text_set_rendering_mode, Tr) \
V(TextSetRise, text_set_rise, Ts) \
V(TextBegin, text_begin, BT) \
V(TextEnd, text_end, ET) \
V(TextNextLineOffset, text_next_line_offset, Td) \
V(TextNextLineAndSetLeading, text_next_line_and_set_leading, TD) \
V(TextSetMatrixAndLineMatrix, text_set_matrix_and_line_matrix, Tm) \
V(TextNextLine, text_next_line, T*) \
V(TextShowString, text_show_string, Tj)
namespace PDF {
enum class CommandType {
#define V(name, snake_name, symbol) name,
ENUMERATE_COMMANDS(V)
#undef V
TextNextLineShowString,
};
class Command {
public:
static CommandType command_type_from_symbol(const StringView& symbol_string)
{
#define V(name, snake_name, symbol) \
if (symbol_string == #symbol) \
return CommandType::name;
ENUMERATE_COMMANDS(V)
#undef V
if (symbol_string == "'")
return CommandType::TextNextLineShowString;
dbgln("unsupported graphics symbol {}", symbol_string);
VERIFY_NOT_REACHED();
}
static const char* command_name(CommandType command_name)
{
#define V(name, snake_name, symbol) \
if (command_name == CommandType::name) \
return #name;
ENUMERATE_COMMANDS(V)
#undef V
if (command_name == CommandType::TextNextLineShowString)
return "TextNextLineShowString";
VERIFY_NOT_REACHED();
}
static const char* command_symbol(CommandType command_name)
{
#define V(name, snake_name, symbol) \
if (command_name == CommandType::name) \
return #symbol;
ENUMERATE_COMMANDS(V)
#undef V
if (command_name == CommandType::TextNextLineShowString)
return "'";
VERIFY_NOT_REACHED();
}
Command(CommandType command_type, Vector<Value> arguments)
: m_command_type(command_type)
, m_arguments(move(arguments))
{
}
[[nodiscard]] ALWAYS_INLINE CommandType command_type() const { return m_command_type; }
[[nodiscard]] ALWAYS_INLINE const Vector<Value>& arguments() const { return m_arguments; }
private:
CommandType m_command_type;
Vector<Value> m_arguments;
};
}
namespace AK {
template<>
struct Formatter<PDF::Command> : Formatter<StringView> {
void format(FormatBuilder& format_builder, const PDF::Command& command)
{
StringBuilder builder;
builder.appendff("{} [ ", PDF::Command::command_name(command.command_type()));
for (auto& argument : command.arguments())
builder.appendff(" {}", argument);
builder.append(" ]");
Formatter<StringView>::format(format_builder, builder.to_string());
}
};
}

46
Userland/Libraries/LibPDF/Parser.cpp
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@ -19,11 +19,22 @@ static NonnullRefPtr<T> make_object(Args... args) requires(IsBaseOf<Object, T>)
return adopt_ref(*new T(forward<Args>(args)...));
}
Vector<Command> Parser::parse_graphics_commands(const ReadonlyBytes& bytes)
{
Parser parser(bytes);
return parser.parse_graphics_commands();
}
Parser::Parser(Badge<Document>, const ReadonlyBytes& bytes)
: m_reader(bytes)
{
}
Parser::Parser(const ReadonlyBytes& bytes)
: m_reader(bytes)
{
}
bool Parser::perform_validation()
{
return !sloppy_is_linearized() && parse_header();
@ -650,6 +661,41 @@ NonnullRefPtr<StreamObject> Parser::parse_stream(NonnullRefPtr<DictObject> dict)
return make_object<StreamObject>(dict, bytes);
}
Vector<Command> Parser::parse_graphics_commands()
{
Vector<Command> commands;
Vector<Value> command_args;
constexpr static auto is_command_char = [](char ch) {
return isalpha(ch) || ch == '*' || ch == '\'';
};
while (!m_reader.done()) {
auto ch = m_reader.peek();
if (is_command_char(ch)) {
auto command_start = m_reader.offset();
while (is_command_char(ch)) {
consume();
if (m_reader.done())
break;
ch = m_reader.peek();
}
auto command_string = StringView(m_reader.bytes().slice(command_start, m_reader.offset() - command_start));
auto command_type = Command::command_type_from_symbol(command_string);
commands.append(Command(command_type, move(command_args)));
command_args = Vector<Value>();
consume_whitespace();
continue;
}
command_args.append(parse_value());
}
return commands;
}
bool Parser::matches_eol() const
{
return m_reader.matches_any(0xa, 0xd);

7
Userland/Libraries/LibPDF/Parser.h
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@ -7,6 +7,7 @@
#pragma once
#include <AK/NonnullRefPtrVector.h>
#include <LibPDF/Command.h>
#include <LibPDF/Object.h>
#include <LibPDF/Reader.h>
#include <LibPDF/XRefTable.h>
@ -17,6 +18,8 @@ class Document;
class Parser {
public:
static Vector<Command> parse_graphics_commands(const ReadonlyBytes&);
Parser(Badge<Document>, const ReadonlyBytes&);
void set_document(RefPtr<Document> document) { m_document = document; }
@ -34,6 +37,8 @@ public:
RefPtr<DictObject> conditionally_parse_page_tree_node_at_offset(size_t offset);
private:
explicit Parser(const ReadonlyBytes&);
bool parse_header();
XRefTable parse_xref_table();
NonnullRefPtr<DictObject> parse_file_trailer();
@ -64,6 +69,8 @@ private:
NonnullRefPtr<DictObject> parse_dict();
NonnullRefPtr<StreamObject> parse_stream(NonnullRefPtr<DictObject> dict);
Vector<Command> parse_graphics_commands();
bool matches_eol() const;
bool matches_whitespace() const;
bool matches_number() const;