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/**
 * BSD-style license; for more info see http://pmd.sourceforge.net/license.html
 */
package net.sourceforge.pmd.cpd;

import net.sourceforge.pmd.lang.ast.TokenMgrError;
import net.sourceforge.pmd.lang.swift.antlr4.SwiftLexer;

import org.antlr.v4.runtime.ANTLRInputStream;
import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.Lexer;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;
import org.antlr.v4.runtime.Token;

/**
 * The Swift Tokenizer
 */
public class SwiftTokenizer implements Tokenizer {

    @Override
    public void tokenize(SourceCode sourceCode, Tokens tokenEntries) {
        StringBuilder buffer = sourceCode.getCodeBuffer();

        try {
            ANTLRInputStream ais = new ANTLRInputStream(buffer.toString());
            SwiftLexer lexer = new SwiftLexer(ais);

            lexer.removeErrorListeners();
            lexer.addErrorListener(new ErrorHandler());
            Token token = lexer.nextToken();

            while (token.getType() != Token.EOF) {
                if (token.getChannel() != Lexer.HIDDEN) {
                    TokenEntry tokenEntry =
                            new TokenEntry(token.getText(), sourceCode.getFileName(), token.getLine());

                    tokenEntries.add(tokenEntry);
                }
                token = lexer.nextToken();
            }
        } catch (ANTLRSyntaxError err) {
            // Wrap exceptions of the Swift tokenizer in a TokenMgrError, so they are correctly handled
            // when CPD is executed with the '--skipLexicalErrors' command line option
            throw new TokenMgrError(
                    "Lexical error in file " + sourceCode.getFileName() + " at line " +
                    err.getLine() + ", column " + err.getColumn() + ".  Encountered: " + err.getMessage(),
                    TokenMgrError.LEXICAL_ERROR);
        } finally {
            tokenEntries.add(TokenEntry.getEOF());
        }
    }

    private static class ErrorHandler extends BaseErrorListener {
        @Override
        public void syntaxError(Recognizer recognizer, Object offendingSymbol, int line,
                int charPositionInLine, String msg, RecognitionException ex) {
            throw new ANTLRSyntaxError(msg, line, charPositionInLine, ex);
        }
    }

    private static class ANTLRSyntaxError extends RuntimeException {
        private static final long serialVersionUID = 1L;
        private final int line;
        private final int column;

        public ANTLRSyntaxError (String msg, int line, int column, RecognitionException cause) {
            super(msg, cause);
            this.line = line;
            this.column = column;
        }

        public int getLine() {
            return line;
        }

        public int getColumn() {
            return column;
        }
    }
}