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88 lines
2.6 KiB
88 lines
2.6 KiB
#ifndef INC_TokenStreamSelector_h__
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#define INC_TokenStreamSelector_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/TokenStream.h>
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#include <map>
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#include <stack>
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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namespace antlr {
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#endif
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/** A token stream MUX (multiplexor) knows about n token streams
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* and can multiplex them onto the same channel for use by token
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* stream consumer like a parser. This is a way to have multiple
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* lexers break up the same input stream for a single parser.
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* Or, you can have multiple instances of the same lexer handle
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* multiple input streams; this works great for includes.
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*/
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class ANTLR_API TokenStreamSelector : public TokenStream {
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protected:
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/** The set of inputs to the MUX */
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#ifdef OS_NO_ALLOCATOR
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typedef ANTLR_USE_NAMESPACE(std)less<ANTLR_USE_NAMESPACE(std)string> lessp;
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typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,TokenStream*,lessp> inputStreamNames_coll;
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#else
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typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,TokenStream*> inputStreamNames_coll;
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#endif
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inputStreamNames_coll inputStreamNames;
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/** The currently-selected token stream input */
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TokenStream* input;
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/** Used to track stack of input streams */
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#ifdef OS_NO_ALLOCATOR
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typedef ANTLR_USE_NAMESPACE(std)stack<TokenStream*, ANTLR_USE_NAMESPACE(std)deque<TokenStream*> > streamStack_coll;
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#else
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typedef ANTLR_USE_NAMESPACE(std)stack<TokenStream*> streamStack_coll;
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#endif
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streamStack_coll streamStack;
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public:
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TokenStreamSelector();
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~TokenStreamSelector();
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void addInputStream(TokenStream* stream, const ANTLR_USE_NAMESPACE(std)string& key);
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/// Return the stream from which tokens are being pulled at the moment.
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TokenStream* getCurrentStream() const;
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TokenStream* getStream(const ANTLR_USE_NAMESPACE(std)string& sname) const;
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RefToken nextToken();
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TokenStream* pop();
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void push(TokenStream* stream);
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void push(const ANTLR_USE_NAMESPACE(std)string& sname);
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/** Abort recognition of current Token and try again.
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* A stream can push a new stream (for include files
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* for example, and then retry(), which will cause
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* the current stream to abort back to this.nextToken().
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* this.nextToken() then asks for a token from the
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* current stream, which is the new "substream."
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*/
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void retry();
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/** Set the stream without pushing old stream */
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void select(TokenStream* stream);
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void select(const ANTLR_USE_NAMESPACE(std)string& sname);
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};
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#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
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}
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#endif
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#endif //INC_TokenStreamSelector_h__
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