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package bjc.dicelang.expr;
import java.util.LinkedList;
import java.util.List;
import bjc.utils.funcdata.IList;
import bjc.utils.parserutils.splitter.ConfigurableTokenSplitter;
/**
* Implements the lexer for simple expression operations.
*
* @author Ben Culkin
*/
public class Lexer {
/*
* Splitter we use.
*/
private final ConfigurableTokenSplitter split;
/**
* Create a new expression lexer.
*/
public Lexer() {
split = new ConfigurableTokenSplitter(true);
split.addSimpleDelimiters("(", ")");
split.addSimpleDelimiters("+", "-", "*", "/");
}
/**
* Convert a string from a input command to a series of infix tokens.
*
* @param inp
* The input command.
*
* @param tks
* The token state.
*
* @return A series of infix tokens representing the command.
*/
public Token[] lexString(final String inp, final Tokens tks) {
final String[] spacedTokens = inp.split("[ \t]");
final List<Token> tokens = new LinkedList<>();
for (final String spacedToken : spacedTokens) {
final IList<String> splitTokens = split.split(spacedToken);
final IList<Token> rawTokens = splitTokens.map(tok -> tks.lexToken(tok, spacedToken));
rawTokens.forEach(tokens::add);
}
return tokens.toArray(new Token[0]);
}
}
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