OSX/libsecurity_codesigning/antlr2/antlr/TokenStreamSelector.hpp

   1 #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  * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/TokenStreamSelector.hpp#2 $
   9  */
  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__