Generic Interpreter 0.9
Protected API

gi
Class Grammar

java.lang.Object
  |
  +--gi.Lexicon
        |
        +--gi.Grammar
Direct Known Subclasses:
LL1_Grammar, LR0_Grammar

public class Grammar
extends Lexicon

This class implements a Grammar.

Version:
0.9
Author:
© 1999-2000 Craig A. Rich <carich@acm.org>
See Also:
Source code

Inner Class Summary
protected static class Grammar.ParseTree
          This class implements a ParseTree constructed by interpreting a source stream.
protected static class Grammar.Semantics
          This class implements Semantics embedded in productions and evaluated when interpreting.
 
Inner classes inherited from class gi.Lexicon
Lexicon.Concatenation, Lexicon.Exception, Lexicon.Match, Lexicon.NonMatch, Lexicon.PosixClass, Lexicon.Range, Lexicon.Repetition, Lexicon.Singleton, Lexicon.UnicodeCategory, Lexicon.Union
 
Fields inherited from class gi.Lexicon
END_OF_SOURCE
 
Constructor Summary
protected Grammar()
          Constructs an empty Grammar.
 
Method Summary
 Object grab(BufferedReader source)
          Grabs terminals from a source character stream using this Grammar.
 Grammar.ParseTree interpret()
          Interprets the standard input stream using this Grammar.
 Grammar.ParseTree interpret(File source)
          Interprets a source file using this Grammar.
 Grammar.ParseTree interpret(InputStream source)
          Interprets a source byte stream using this Grammar.
 Grammar.ParseTree interpret(PipedWriter source)
          Interprets a source pipe using this Grammar.
 Grammar.ParseTree interpret(Reader source)
          Interprets a source character stream using this Grammar.
 Grammar.ParseTree interpret(String source)
          Interprets a source string using this Grammar.
 Grammar.ParseTree interpret(String[] argv)
          Interprets by command-line arguments using this Grammar.
protected  void put(Object nonterminal, Object[] phrase)
          Puts a production into this Grammar.
protected  void put(Object nonterminal, Object[][] phrases)
          Puts productions into this Grammar.
 
Methods inherited from class gi.Lexicon
expression, put, word
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

Grammar

protected Grammar()

Constructs an empty Grammar.

Method Detail

grab

public Object grab(BufferedReader source)
            throws Lexicon.Exception

Grabs terminals from a source character stream using this Grammar. Invokes Lexicon.grab(source) until it returns a terminal occurring in a phrase of this Grammar or end of source. Blocks until a character is available, an I/O error occurs, or the end of the source stream is reached.

Overrides:
grab in class Lexicon
Parameters:
source - the source character stream.
Returns:
the first terminal occurring in a phrase of this Grammar.
Throws:
Lexicon.Exception - if an I/O or lexical error occurs.

interpret

public Grammar.ParseTree interpret()
                            throws Lexicon.Exception

Interprets the standard input stream using this Grammar.

Returns:
the ParseTree constructed by interpreting the standard input stream.
Throws:
Lexicon.Exception - if an I/O, lexical, syntax or semantic error occurs.

interpret

public Grammar.ParseTree interpret(File source)
                            throws FileNotFoundException,
                                   Lexicon.Exception

Interprets a source file using this Grammar.

Parameters:
source - the source file.
Returns:
the ParseTree constructed by interpreting source.
Throws:
FileNotFoundException - if the source file cannot be found.
Lexicon.Exception - if an I/O, lexical, syntax or semantic error occurs.

interpret

public Grammar.ParseTree interpret(InputStream source)
                            throws Lexicon.Exception

Interprets a source byte stream using this Grammar.

Parameters:
source - the source byte stream.
Returns:
the ParseTree constructed by interpreting source.
Throws:
Lexicon.Exception - if an I/O, lexical, syntax or semantic error occurs.

interpret

public Grammar.ParseTree interpret(PipedWriter source)
                            throws IOException,
                                   Lexicon.Exception

Interprets a source pipe using this Grammar.

Parameters:
source - the source pipe.
Returns:
the ParseTree constructed by interpreting source.
Throws:
IOException - if the source pipe cannot be connected.
Lexicon.Exception - if an I/O, lexical, syntax or semantic error occurs.

interpret

public Grammar.ParseTree interpret(Reader source)
                            throws Lexicon.Exception

Interprets a source character stream using this Grammar.

Parameters:
source - the source character stream.
Returns:
the ParseTree constructed by interpreting source.
Throws:
Lexicon.Exception - if an I/O, lexical, syntax or semantic error occurs.

interpret

public Grammar.ParseTree interpret(String source)
                            throws Lexicon.Exception

Interprets a source string using this Grammar.

Parameters:
source - the source string.
Returns:
the ParseTree constructed by interpreting source.
Throws:
Lexicon.Exception - if an I/O, lexical, syntax or semantic error occurs.

interpret

public Grammar.ParseTree interpret(String[] argv)

Interprets by command-line arguments using this Grammar. When interpreting, the parser used will be (in order):

  • The parser most recently constructed by preceding command-line arguments.
  • The parser originally around this Grammar.
  • An LR(1) parser.
The first I/O, lexical, syntax or semantic error that occurs when interpreting is printed to the standard error stream. If requested, each ParseTree is printed to the standard error stream after interpreting.

Parameters:
argv - the command-line arguments controlling the interpreter.
The following arguments may appear zero or more times, are processed in order, and have the following effects:
-tree
Print each ParseTree subsequently constructed by interpreting a source stream.
-ll1
Construct an LL(1) parser around this Grammar.
-lr0
Construct an LR(0) parser around this Grammar.
-slr1
Construct an SLR(1) parser around this Grammar.
-lr1
Construct an LR(1) parser around this Grammar.
-
Interpret the standard input stream using this Grammar.
filename
Interpret source file filename using this Grammar.
If no filename arguments are given, the standard input stream is interpreted.
Returns:
the last ParseTree constructed by interpreting a source stream.

put

protected void put(Object nonterminal,
                   Object[] phrase)

Puts a production into this Grammar. The start symbol is the first nonterminal put in this Grammar.

Parameters:
nonterminal - the nonterminal to be added to this Grammar.
phrase - the phrase produced by nonterminal. phrase may contain nonterminals, terminals, and Semantics.

put

protected void put(Object nonterminal,
                   Object[][] phrases)

Puts productions into this Grammar. The productions are successively added using put(nonterminal, phrase).

Parameters:
nonterminal - the nonterminal on the left-hand side of the production.
phrases - the phrases produced by nonterminal. Each phrase in phrases may contain nonterminals, terminals, and Semantics.

 

© 1999-2000 Craig A. Rich <carich@acm.org>