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package bjc.dicelang;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import bjc.dicelang.dice.DiceBox;
import bjc.dicelang.tokens.DiceToken;
import bjc.dicelang.tokens.FloatToken;
import bjc.dicelang.tokens.Token;
import bjc.funcdata.FunctionalMap;
import bjc.funcdata.MapEx;
import bjc.utils.funcutils.StringUtils;
import bjc.utils.parserutils.TokenUtils;
import static bjc.dicelang.Errors.ErrorKey.*;
import static bjc.dicelang.tokens.Token.Type.*;
/**
* Converts strings into tokens.
*/
public class Tokenizer {
/* Literal tokens for tokenization */
private static final MapEx<String, Token.Type> litTokens;
private final DiceLangEngine eng;
private int nextSym = 0;
static {
litTokens = new FunctionalMap<>();
litTokens.put("+", ADD);
litTokens.put("-", SUBTRACT);
litTokens.put("*", MULTIPLY);
litTokens.put("/", DIVIDE);
litTokens.put("//", IDIVIDE);
litTokens.put("sd", DICESCALAR);
litTokens.put("df", DICEFUDGE);
litTokens.put("dg", DICEGROUP);
litTokens.put("dc", DICECONCAT);
litTokens.put("dl", DICELIST);
litTokens.put("=>", LET);
litTokens.put(":=", BIND);
litTokens.put(".+.", STRCAT);
litTokens.put(".*.", STRREP);
litTokens.put(",", GROUPSEP);
litTokens.put("crc", COERCE);
}
/**
* Create a new tokenizer.
*
* @param engine
* The engine to use.
*/
public Tokenizer(final DiceLangEngine engine) {
eng = engine;
}
/**
* Lex a token.
*
* @param token
* The string to lex.
* @param stringLts
* The set of string literals.
*
* @return A lexed token.
*/
public Token lexToken(final String token, final MapEx<String, String> stringLts) {
if (token.equals("")) {
return null;
}
Token tk = Token.NIL_TOKEN;
if (litTokens.containsKey(token)) {
tk = new Token(litTokens.get(token).get());
} else {
switch (token.charAt(0)) {
case '(':
case ')':
case '[':
case ']':
case '{':
case '}':
tk = tokenizeGrouping(token);
break;
default:
tk = tokenizeLiteral(token, stringLts);
}
}
return tk;
}
private static Token tokenizeGrouping(final String token) {
Token tk = Token.NIL_TOKEN;
if (StringUtils.containsOnly(token, "\\" + token.charAt(0))) {
/* Handle multiple-grouped delimiters. */
switch (token.charAt(0)) {
case '(':
tk = new Token(OPAREN, token.length());
break;
case ')':
tk = new Token(CPAREN, token.length());
break;
case '[':
tk = new Token(OBRACKET, token.length());
break;
case ']':
tk = new Token(CBRACKET, token.length());
break;
case '{':
tk = new Token(OBRACE, token.length());
break;
case '}':
tk = new Token(CBRACE, token.length());
break;
default:
Errors.inst.printError(EK_TOK_UNGROUP, token);
break;
}
}
return tk;
}
/* Patterns for matching. */
private final Pattern hexadecimalMatcher = Pattern.compile("\\A[\\-\\+]?0x[0-9A-Fa-f]+\\Z");
private final Pattern flexadecimalMatcher = Pattern.compile("\\A[\\-\\+]?[0-9][0-9A-Za-z]+B\\d{1,2}\\Z");
private final Pattern stringLitMatcher = Pattern.compile("\\AstringLiteral(\\d+)\\Z");
/* Tokenize a literal value. */
private Token tokenizeLiteral(final String rtoken, final MapEx<String, String> stringLts) {
Token tk = Token.NIL_TOKEN;
String token = rtoken.trim();
if (TokenUtils.isInt(token)) {
tk = new Token(INT_LIT, Long.parseLong(token));
} else if (hexadecimalMatcher.matcher(token).matches()) {
final String newToken = token.substring(0, 1) + token.substring(token.indexOf('x'));
tk = new Token(INT_LIT, Long.parseLong(newToken.substring(2).toUpperCase(), 16));
} else if (flexadecimalMatcher.matcher(token).matches()) {
final int parseBase = Integer.parseInt(token.substring(token.lastIndexOf('B') + 1));
if (parseBase < Character.MIN_RADIX || parseBase > Character.MAX_RADIX) {
Errors.inst.printError(EK_TOK_INVBASE, Integer.toString(parseBase));
return Token.NIL_TOKEN;
}
final String flexNum = token.substring(0, token.lastIndexOf('B'));
try {
tk = new Token(INT_LIT, Long.parseLong(flexNum, parseBase));
} catch (final NumberFormatException nfex) {
Errors.inst.printError(EK_TOK_INVFLEX, flexNum, Integer.toString(parseBase));
return Token.NIL_TOKEN;
}
} else if (TokenUtils.isDouble(token)) {
tk = new FloatToken(Double.parseDouble(token));
} else if (DiceBox.isValidExpression(token)) {
tk = new DiceToken(DiceBox.parseExpression(token));
} else {
final Matcher stringLit = stringLitMatcher.matcher(token);
if (stringLit.matches()) {
final int litNum = Integer.parseInt(stringLit.group(1));
eng.addStringLiteral(litNum, stringLts.get(token).get());
tk = new Token(STRING_LIT, litNum);
} else {
/* Everything else is a symbol */
eng.symTable.put(nextSym++, token);
tk = new Token(VREF, nextSym - 1);
}
}
return tk;
}
}
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