/**
* Process an input string through the tokenizer and then parser.
*
* <p>A sequence of <code>$x=(3+5)/2;</code> will return an IExpressionNode with a value of <code>
* 4.0</code>.
*
* @param sequence input to parse
* @return IExpressionNode result
* @throws ParserException
*/
public List<IExpressionNode> parse(String sequence) throws ParserException {
if (tokenizer == null) {
tokenizer = new Tokenizer();
initialiseTokenizer();
}
tokenizer.tokenize(sequence);
statementList = tokenizer.getStatementList();
return parse();
}
/** Add the set tokens for Parser's Tokenizer */
private void initialiseTokenizer() {
tokenizer.addToken("sin|cos|exp|ln|sqrt", FUNCTION);
tokenizer.addToken("\\(", LPAREN);
tokenizer.addToken("\\)", RPAREN);
tokenizer.addToken("[+-]", PLUSMINUS);
tokenizer.addToken("[*/]", MULTDIV);
tokenizer.addToken("\\<|\\>|\\<\\=|\\>\\=|\\!\\=", COMPARATOR);
tokenizer.addToken("\\^", RAISED);
tokenizer.addToken("[0-9]+", NUMBER);
tokenizer.addToken("\\$[a-zA-Z][a-zA-Z0-9_]*", VARIABLE);
tokenizer.addToken("\\=", EQUALS);
tokenizer.addToken("\\;", ITokens.SEMICOLON);
tokenizer.addToken("print", PRINT);
}