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/*
* Copyright (c) 2021, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/NonnullRefPtrVector.h>
#include <LibPDF/Command.h>
#include <LibPDF/Object.h>
#include <LibPDF/Reader.h>
#include <LibPDF/XRefTable.h>
namespace PDF {
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; }
bool perform_validation();
struct XRefTableAndTrailer {
XRefTable xref_table;
NonnullRefPtr<DictObject> trailer;
};
XRefTableAndTrailer parse_last_xref_table_and_trailer();
NonnullRefPtr<IndirectValue> parse_indirect_value_at_offset(size_t offset);
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();
bool navigate_to_before_eof_marker();
bool navigate_to_after_startxref();
// If the PDF is linearized, the first object will be the linearization
// parameter dictionary, and it will always occur within the first 1024 bytes.
// We do a very sloppy and context-free search for this object. A return value
// of true does not necessarily mean this PDF is linearized, but a return value
// of false does mean this PDF is not linearized.
// FIXME: false doesn't guarantee non-linearization, but we VERIFY the result!
bool sloppy_is_linearized();
String parse_comment();
Value parse_value();
Value parse_possible_indirect_value_or_ref();
NonnullRefPtr<IndirectValue> parse_indirect_value(int index, int generation);
NonnullRefPtr<IndirectValue> parse_indirect_value();
Value parse_number();
NonnullRefPtr<NameObject> parse_name();
NonnullRefPtr<StringObject> parse_string();
String parse_literal_string();
String parse_hex_string();
NonnullRefPtr<ArrayObject> parse_array();
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;
bool matches_delimiter() const;
bool matches_regular_character() const;
void consume_eol();
bool consume_whitespace();
char consume();
void consume(char);
Reader m_reader;
RefPtr<Document> m_document;
};
}
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