Source Code Cross Referenced for Lexer.java in  » Parser » runcc » fri » patterns » interpreter » parsergenerator » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Parser » runcc » fri.patterns.interpreter.parsergenerator 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package fri.patterns.interpreter.parsergenerator;
02:
03:        import java.util.List;
04:        import java.util.Map;
05:        import java.io.PrintStream;
06:        import java.io.IOException;
07:
08:        /**
09:         A Lexer reads input bytes (InputStream) or characters (Reader), until
10:         one of its terminals is fulfilled. This happens when the Parser calls 
11:         <i>getNextToken()</i>. The terminals will be set by the Parser on init.
12:         <p>
13:         Usage:
14:         <pre>
15:         SyntaxSeparation separation = new SyntaxSeparation(new Syntax(myRules));
16:         LexerBuilder builder = new LexerBuilder(separation.getLexerSyntax(), separation.getIgnoredSymbols());
17:         Lexer lexer = builder.getLexer(inputStream);
18:         lexer.setTerminals(separation.getTokenSymbols());
19:         Token token;
20:         do	{
21:         token = lexer.getNextToken(null);
22:         System.err.println("token.symbol="+token.symbol+", text >"+token.text+"<");
23:         }
24:         while (token.symbol != null && Token.isEpsilon(token) == false);
25:         boolean error = token.symbol == null;
26:         </pre>
27:
28:         @see fri.patterns.interpreter.parsergenerator.lexer.LexerImpl
29:         @author (c) 2000, Fritz Ritzberger
30:         */
31:
32:        public interface Lexer {
33:            /**
34:            	Set the input to be processed by the Lexer.
35:            	@param text can be String, StringBuffer, File, InputStream, Reader.
36:             */
37:            public void setInput(Object text) throws IOException;
38:
39:            /**
40:            	Tells the Lexer the terminals (tokens) to scan, called on init. Every terminal is a String
41:            	that satisfies the facts defined in <i>Token.isTerminal()</i> (EPSILON or delimited by quotes).
42:            	@param terminals List of String containing all terminals of the parser syntax.
43:             */
44:            public void setTerminals(List terminals);
45:
46:            /**
47:            	Returns the next token from input. This is done trying to satisy the parser hints, or
48:            	by using contained character consumers, which are obtained by the lexer strategy.
49:            	@param tokenSymbols a Map that contains token symbols (in "key" field) expected by the Parser, can be null (slower).
50:            	@return a Token with a terminal symbol and its instance text, or a Token with null symbol for error.
51:             */
52:            public Token getNextToken(Map tokenSymbols) throws IOException;
53:
54:            /** Reset the Lexer for another pass. */
55:            public void clear();
56:
57:            /**
58:             * A way to receive every parsing syntax Token the Lexer reads, even it is ignored.
59:             * The implementer can install itself by calling <i>addTokenListener()</i>.
60:             */
61:            public interface TokenListener {
62:                /**
63:                 * The implementer receives every token the lexer reads, even if it is ignored.
64:                 * @param token the Token that was successfully scanned from input.
65:                 * @param ignored true when this Token will be thrown away (not passed to Parser), else false.
66:                 */
67:                public void tokenReceived(Token token, boolean ignored);
68:            }
69:
70:            /**
71:             * Installs a TokenListener that wants to know about every read Token, even it is ignored.
72:             * @param listener the Lexer.Listener implementation to install.
73:             */
74:            public void addTokenListener(Lexer.TokenListener listener);
75:
76:            /**
77:             * Removes a TokenListener from this Lexer.
78:             * @param listener the Lexer.Listener implementation to remove.
79:             */
80:            public void removeTokenListener(Lexer.TokenListener listener);
81:
82:            // debug methods
83:
84:            /** Dump the current text and the scan position. */
85:            public void dump(PrintStream out);
86:
87:            /** Turn on and off debug mode. */
88:            public void setDebug(boolean debug);
89:
90:        }
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