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114 lines
3.5 KiB
Plaintext
114 lines
3.5 KiB
Plaintext
//========================================================================
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//
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// Lexer.h
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//
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// Copyright 1996-2003 Glyph & Cog, LLC
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//
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//========================================================================
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//========================================================================
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//
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// Modified under the Poppler project - http://poppler.freedesktop.org
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//
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// All changes made under the Poppler project to this file are licensed
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// under GPL version 2 or later
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//
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// Copyright (C) 2006, 2007, 2010, 2013, 2017-2019 Albert Astals Cid <aacid@kde.org>
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// Copyright (C) 2006 Krzysztof Kowalczyk <kkowalczyk@gmail.com>
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// Copyright (C) 2013 Adrian Johnson <ajohnson@redneon.com>
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// Copyright (C) 2013 Thomas Freitag <Thomas.Freitag@alfa.de>
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// Copyright (C) 2019 Adam Reichold <adam.reichold@t-online.de>
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//
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// To see a description of the changes please see the Changelog file that
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// came with your tarball or type make ChangeLog if you are building from git
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//
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//========================================================================
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#ifndef LEXER_H
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#define LEXER_H
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#include "Object.h"
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#include "Stream.h"
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class XRef;
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#define tokBufSize 128 // size of token buffer
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//------------------------------------------------------------------------
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// Lexer
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//------------------------------------------------------------------------
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class POPPLER_PRIVATE_EXPORT Lexer
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{
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public:
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// Construct a lexer for a single stream. Deletes the stream when
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// lexer is deleted.
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Lexer(XRef *xrefA, Stream *str);
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// Construct a lexer for a stream or array of streams (assumes obj
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// is either a stream or array of streams).
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Lexer(XRef *xrefA, Object *obj);
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// Destructor.
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~Lexer();
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Lexer(const Lexer &) = delete;
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Lexer &operator=(const Lexer &) = delete;
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// Get the next object from the input stream.
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Object getObj(int objNum = -1);
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Object getObj(const char *cmdA, int objNum);
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template<typename T>
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Object getObj(T) = delete;
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// Skip to the beginning of the next line in the input stream.
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void skipToNextLine();
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// Skip over one character.
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void skipChar() { getChar(); }
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// Get stream.
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Stream *getStream() { return curStr.isStream() ? curStr.getStream() : nullptr; }
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// Get current position in file. This is only used for error
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// messages.
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Goffset getPos() const { return curStr.isStream() ? curStr.getStream()->getPos() : -1; }
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// Set position in file.
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void setPos(Goffset pos)
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{
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if (curStr.isStream()) {
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curStr.getStream()->setPos(pos);
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}
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}
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// Returns true if <c> is a whitespace character.
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static bool isSpace(int c);
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// often (e.g. ~30% on PDF Refernce 1.6 pdf file from Adobe site) getChar
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// is called right after lookChar. In order to avoid expensive re-doing
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// getChar() of underlying stream, we cache the last value found by
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// lookChar() in lookCharLastValueCached. A special value
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// LOOK_VALUE_NOT_CACHED that should never be part of stream indicates
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// that no value was cached
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static const int LOOK_VALUE_NOT_CACHED = -3;
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int lookCharLastValueCached;
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XRef *getXRef() const { return xref; }
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bool hasXRef() const { return xref != nullptr; }
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private:
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int getChar(bool comesFromLook = false);
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int lookChar();
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Array *streams; // array of input streams
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int strPtr; // index of current stream
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Object curStr; // current stream
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bool freeArray; // should lexer free the streams array?
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char tokBuf[tokBufSize]; // temporary token buffer
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XRef *xref;
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};
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#endif
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