org.sc3d.apt.sss.v3
Class Lex

java.lang.Object
  org.sc3d.apt.sss.v3.Lex

public class Lex
extends java.lang.Object

Represents a lexical analysis of a Sentence. The analysis recognises comments, keywords (including punctuation strings and separator characters), constants, identifers, numbers and strings, which it wraps up as Tokens with appropriate types. All white-space is discarded.

Field Summary

int	numTokens The number of lexographic Tokens found in 'sentence'.
Sentence	sentence The Sentence of which this is the lexical analysis.

Constructor Summary

Lex(Sentence sentence)
Constructs a Lex representing the lexical structure of 'sentence'.

Method Summary

Token	getToken(int index) Returns one of the lexographic Tokens.
static void	main(java.lang.String[] args) Takes one argument: a filename.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

sentence

public final Sentence sentence

The Sentence of which this is the lexical analysis.

numTokens

public final int numTokens

The number of lexographic Tokens found in 'sentence'.

Constructor Detail

Lex

public Lex(Sentence sentence)

Constructs a Lex representing the lexical structure of 'sentence'. Attaches error messages to 'sentence' if appropriate.

Method Detail

getToken

public Token getToken(int index)

Returns one of the lexographic Tokens.

Parameters:

index - the index of the Token, from '0' to 'numTokens-1'.

main

public static void main(java.lang.String[] args)
                 throws java.io.IOException

Takes one argument: a filename. Reads the file and lexes it. If there are errors, prints an error report. Otherwise lists the Tokens.

Throws:

java.io.IOException