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157 lines
3.3 KiB
157 lines
3.3 KiB
#ifndef INC_LexerSharedInputState_h__
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#define INC_LexerSharedInputState_h__
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/* ANTLR Translator Generator
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* Project led by Terence Parr at http://www.jGuru.com
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* Software rights: http://www.antlr.org/license.html
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*
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* $Id$
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*/
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#include <antlr/config.h>
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#include <antlr/InputBuffer.h>
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#include <antlr/RefCount.h>
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#include <antlr/CharBuffer.h>
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#include <string>
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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namespace antlr {
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#endif
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/** This object contains the data associated with an
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* input stream of characters. Multiple lexers
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* share a single LexerSharedInputState to lex
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* the same input stream.
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*/
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class ANTLR_API LexerInputState {
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public:
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/** Construct a new LexerInputState
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* @param inbuf the InputBuffer to read from. The object is deleted together
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* with the LexerInputState object.
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*/
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LexerInputState(InputBuffer* inbuf)
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: column(1)
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, line(1)
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, tokenStartColumn(1)
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, tokenStartLine(1)
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, guessing(0)
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, filename("")
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, input(inbuf)
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, inputResponsible(true)
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{
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}
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/** Construct a new LexerInputState
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* @param inbuf the InputBuffer to read from.
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*/
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LexerInputState(InputBuffer& inbuf)
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: column(1)
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, line(1)
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, tokenStartColumn(1)
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, tokenStartLine(1)
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, guessing(0)
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, filename("")
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, input(&inbuf)
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, inputResponsible(false)
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{
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}
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/** Construct a new LexerInputState
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* @param in an istream to read from.
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* @see antlr.CharBuffer
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*/
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LexerInputState(ANTLR_USE_NAMESPACE(std)istream& in)
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: column(1)
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, line(1)
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, tokenStartColumn(1)
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, tokenStartLine(1)
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, guessing(0)
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, filename("")
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, input(new CharBuffer(in))
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, inputResponsible(true)
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{
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}
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/** Reset the LexerInputState with a specified stream and filename.
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* This method is a hack, dunno what I was thinking when I added it.
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* This should actually be done in a subclass.
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* @deprecated
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*/
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virtual void initialize( ANTLR_USE_NAMESPACE(std)istream& in, const char* file = "" )
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{
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column = 1;
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line = 1;
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tokenStartColumn = 1;
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tokenStartLine = 1;
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guessing = 0;
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filename = file;
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if( input && inputResponsible )
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delete input;
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input = new CharBuffer(in);
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inputResponsible = true;
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}
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/** Reset the LexerInputState to initial state.
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* The underlying InputBuffer is also reset.
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*/
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virtual void reset( void )
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{
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column = 1;
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line = 1;
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tokenStartColumn = 1;
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tokenStartLine = 1;
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guessing = 0;
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input->reset();
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}
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/** Set the file position of the SharedLexerInputState.
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* @param line_ line number to be set
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* @param column_ column number to be set
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*/
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void setPosition( int line_, int column_ )
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{
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line = line_;
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column = column_;
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}
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virtual ~LexerInputState()
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{
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if (inputResponsible)
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delete input;
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}
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int column;
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int line;
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int tokenStartColumn;
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int tokenStartLine;
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int guessing;
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/** What file (if known) caused the problem? */
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ANTLR_USE_NAMESPACE(std)string filename;
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InputBuffer& getInput();
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private:
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/// Input buffer we use
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InputBuffer* input;
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/// Who is responsible for cleaning up the InputBuffer?
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bool inputResponsible;
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// we don't want these:
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LexerInputState(const LexerInputState&);
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LexerInputState& operator=(const LexerInputState&);
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};
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inline InputBuffer& LexerInputState::getInput()
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{
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return *input;
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}
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/// A reference counted LexerInputState object
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typedef RefCount<LexerInputState> LexerSharedInputState;
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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}
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#endif
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#endif //INC_LexerSharedInputState_h__
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