| 1 |
tim |
770 |
#ifndef INC_TokenStreamSelector_hpp__ |
| 2 |
|
|
#define INC_TokenStreamSelector_hpp__ |
| 3 |
|
|
|
| 4 |
|
|
/* ANTLR Translator Generator |
| 5 |
|
|
* Project led by Terence Parr at http://www.jGuru.com |
| 6 |
|
|
* Software rights: http://www.antlr.org/license.html |
| 7 |
|
|
* |
| 8 |
gezelter |
1442 |
* $Id$ |
| 9 |
tim |
770 |
*/ |
| 10 |
|
|
|
| 11 |
|
|
#include <antlr/config.hpp> |
| 12 |
|
|
#include <antlr/TokenStream.hpp> |
| 13 |
|
|
#include <map> |
| 14 |
|
|
#include <stack> |
| 15 |
|
|
|
| 16 |
|
|
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
| 17 |
|
|
namespace antlr { |
| 18 |
|
|
#endif |
| 19 |
|
|
|
| 20 |
|
|
/** A token stream MUX (multiplexor) knows about n token streams |
| 21 |
|
|
* and can multiplex them onto the same channel for use by token |
| 22 |
|
|
* stream consumer like a parser. This is a way to have multiple |
| 23 |
|
|
* lexers break up the same input stream for a single parser. |
| 24 |
|
|
* Or, you can have multiple instances of the same lexer handle |
| 25 |
|
|
* multiple input streams; this works great for includes. |
| 26 |
|
|
*/ |
| 27 |
|
|
class ANTLR_API TokenStreamSelector : public TokenStream { |
| 28 |
|
|
protected: |
| 29 |
|
|
/** The set of inputs to the MUX */ |
| 30 |
|
|
#ifdef OS_NO_ALLOCATOR |
| 31 |
|
|
typedef ANTLR_USE_NAMESPACE(std)less<ANTLR_USE_NAMESPACE(std)string> lessp; |
| 32 |
|
|
typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,TokenStream*,lessp> inputStreamNames_coll; |
| 33 |
|
|
#else |
| 34 |
|
|
typedef ANTLR_USE_NAMESPACE(std)map<ANTLR_USE_NAMESPACE(std)string,TokenStream*> inputStreamNames_coll; |
| 35 |
|
|
#endif |
| 36 |
|
|
inputStreamNames_coll inputStreamNames; |
| 37 |
|
|
|
| 38 |
|
|
/** The currently-selected token stream input */ |
| 39 |
|
|
TokenStream* input; |
| 40 |
|
|
|
| 41 |
|
|
/** Used to track stack of input streams */ |
| 42 |
|
|
#ifdef OS_NO_ALLOCATOR |
| 43 |
|
|
typedef ANTLR_USE_NAMESPACE(std)stack<TokenStream*, ANTLR_USE_NAMESPACE(std)deque<TokenStream*> > streamStack_coll; |
| 44 |
|
|
#else |
| 45 |
|
|
typedef ANTLR_USE_NAMESPACE(std)stack<TokenStream*> streamStack_coll; |
| 46 |
|
|
#endif |
| 47 |
|
|
streamStack_coll streamStack; |
| 48 |
|
|
|
| 49 |
|
|
public: |
| 50 |
|
|
TokenStreamSelector(); |
| 51 |
|
|
~TokenStreamSelector(); |
| 52 |
|
|
|
| 53 |
|
|
void addInputStream(TokenStream* stream, const ANTLR_USE_NAMESPACE(std)string& key); |
| 54 |
|
|
|
| 55 |
|
|
/// Return the stream from which tokens are being pulled at the moment. |
| 56 |
|
|
TokenStream* getCurrentStream() const; |
| 57 |
|
|
|
| 58 |
|
|
TokenStream* getStream(const ANTLR_USE_NAMESPACE(std)string& sname) const; |
| 59 |
|
|
|
| 60 |
|
|
RefToken nextToken(); |
| 61 |
|
|
|
| 62 |
|
|
TokenStream* pop(); |
| 63 |
|
|
|
| 64 |
|
|
void push(TokenStream* stream); |
| 65 |
|
|
|
| 66 |
|
|
void push(const ANTLR_USE_NAMESPACE(std)string& sname); |
| 67 |
|
|
|
| 68 |
|
|
/** Abort recognition of current Token and try again. |
| 69 |
|
|
* A stream can push a new stream (for include files |
| 70 |
|
|
* for example, and then retry(), which will cause |
| 71 |
|
|
* the current stream to abort back to this.nextToken(). |
| 72 |
|
|
* this.nextToken() then asks for a token from the |
| 73 |
|
|
* current stream, which is the new "substream." |
| 74 |
|
|
*/ |
| 75 |
|
|
void retry(); |
| 76 |
|
|
|
| 77 |
|
|
/** Set the stream without pushing old stream */ |
| 78 |
|
|
void select(TokenStream* stream); |
| 79 |
|
|
|
| 80 |
|
|
void select(const ANTLR_USE_NAMESPACE(std)string& sname); |
| 81 |
|
|
}; |
| 82 |
|
|
|
| 83 |
|
|
#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE |
| 84 |
|
|
} |
| 85 |
|
|
#endif |
| 86 |
|
|
|
| 87 |
|
|
#endif //INC_TokenStreamSelector_hpp__ |
