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LexerAdapter.java
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LexerAdapter.java
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package syntax_analysis;
import lexical_analysis.Lexer;
import lexical_analysis.tokens.Token;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Field;
import java.util.List;
public class LexerAdapter implements Parser.Lexer {
final private List<Token> tokens;
private int currentTokenIndex;
private Token currentToken;
public LexerAdapter(FileReader fileReader) throws IOException {
Lexer lexer = new Lexer(fileReader);
lexer.tokenize();
tokens = lexer.getTokens();
currentTokenIndex = 0;
}
public List<Token> getTokens() {
return tokens;
}
@Override
public Token getLVal() {
return currentToken;
}
@Override
public int yylex() {
if (currentTokenIndex == tokens.size()) {
return YYEOF;
}
currentToken = tokens.get(currentTokenIndex++);
String tokenName = currentToken.getClass().getSimpleName();
int tokenCode = YYerror;
try {
Field field = Parser.Lexer.class.getDeclaredField(tokenName);
tokenCode = (Integer) field.get(Parser.Lexer.class);
} catch (NoSuchFieldException | IllegalAccessException e) {
e.printStackTrace();
}
return tokenCode;
}
@Override
public void yyerror(String msg) {
System.out.println(msg);
}
}