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package com.oracle.js.parser;

Handles JavaScript error reporting.
/**
 * Handles JavaScript error reporting.
 */
public abstract class ErrorManager {
    // TODO - collect and sort/collapse error messages.
    // TODO - property based error messages.
    
Error count. /** Error count. */
    private int errors;

    
Warning count /** Warning count */
    private int warnings;

    
Limit of the number of messages. /** Limit of the number of messages. */
    private int limit;

    
Treat warnings as errors. /** Treat warnings as errors. */
    private boolean warningsAsErrors;

    
First thrown ParserException. /** First thrown ParserException. */
    private ParserException parserException;

    
Constructor
/**
     * Constructor
     */
    protected ErrorManager() {
        this.limit = 100;
        this.warningsAsErrors = false;
    }

    
Check to see if number of errors exceed limit.
/**
     * Check to see if number of errors exceed limit.
     */
    private void checkLimit() {
        int count = errors;

        if (warningsAsErrors) {
            count += warnings;
        }

        if (limit != 0 && count > limit) {
            // throw rangeError("too.many.errors", Integer.toString(limit));
            throw new RuntimeException("too many errors");
        }
    }

    
Format an error message to include source and line information.
Params:
message – Error message string.
source – Source file information.
line – Source line number.
column – Source column number.
token – Offending token descriptor.
Returns:
formatted string/**
     * Format an error message to include source and line information.
     *
     * @param message Error message string.
     * @param source Source file information.
     * @param line Source line number.
     * @param column Source column number.
     * @param token Offending token descriptor.
     * @return formatted string
     */
    public static String format(final String message, final Source source, final int line, final int column, final long token) {
        final String eoln = System.lineSeparator();
        final int position = Token.descPosition(token);
        final StringBuilder sb = new StringBuilder();

        // Source description and message.
        sb.append(source.getName()).append(':').append(line).append(':').append(column).append(' ').append(message).append(eoln);

        // Source content.
        final CharSequence sourceLine = source.getSourceLine(position);
        sb.append(sourceLine).append(eoln);

        // Pointer to column.
        for (int i = 0; i < column; i++) {
            if (sourceLine.charAt(i) == '\t') {
                sb.append('\t');
            } else {
                sb.append(' ');
            }
        }

        sb.append('^');
        // Use will append eoln.
        // buffer.append(eoln);

        return sb.toString();
    }

    
Report an error or warning message.
Params:
message – Error message string./**
     * Report an error or warning message.
     *
     * @param message Error message string.
     */
    protected void message(final String message) {
    }

    
Report an error using information provided by the ParserException
Params:
e – ParserException object/**
     * Report an error using information provided by the ParserException
     *
     * @param e ParserException object
     */

    public void error(final ParserException e) {
        if (this.parserException == null) {
            this.parserException = e;
        }
        error(e.getMessage());
    }

    
Report an error message provided
Params:
message – Error message string./**
     * Report an error message provided
     *
     * @param message Error message string.
     */
    public void error(final String message) {
        message(message);
        errors++;
        checkLimit();
    }

    
Report a warning using information provided by the ParserException
Params:
e – ParserException object/**
     * Report a warning using information provided by the ParserException
     *
     * @param e ParserException object
     */
    public void warning(final ParserException e) {
        warning(e.getMessage());
    }

    
Report a warning message provided
Params:
message – Error message string./**
     * Report a warning message provided
     *
     * @param message Error message string.
     */
    public void warning(final String message) {
        message(message);
        warnings++;
        checkLimit();
    }

    
Test to see if errors have occurred.
Returns:
True if errors./**
     * Test to see if errors have occurred.
     *
     * @return True if errors.
     */
    public boolean hasErrors() {
        return errors != 0;
    }

    
Get the message limit
Returns:
max number of messages/**
     * Get the message limit
     *
     * @return max number of messages
     */
    public int getLimit() {
        return limit;
    }

    
Set the message limit
Params:
limit – max number of messages/**
     * Set the message limit
     *
     * @param limit max number of messages
     */
    public void setLimit(final int limit) {
        this.limit = limit;
    }

    
Check whether warnings should be treated like errors
Returns:
true if warnings should be treated like errors/**
     * Check whether warnings should be treated like errors
     *
     * @return true if warnings should be treated like errors
     */
    public boolean isWarningsAsErrors() {
        return warningsAsErrors;
    }

    
Set warnings to be treated as errors
Params:
warningsAsErrors – true if warnings should be treated as errors, false otherwise/**
     * Set warnings to be treated as errors
     *
     * @param warningsAsErrors true if warnings should be treated as errors, false otherwise
     */
    public void setWarningsAsErrors(final boolean warningsAsErrors) {
        this.warningsAsErrors = warningsAsErrors;
    }

    
Get the number of errors
Returns:
number of errors/**
     * Get the number of errors
     *
     * @return number of errors
     */
    public int getNumberOfErrors() {
        return errors;
    }

    
Get number of warnings
Returns:
number of warnings/**
     * Get number of warnings
     *
     * @return number of warnings
     */
    public int getNumberOfWarnings() {
        return warnings;
    }

    public ParserException getParserException() {
        return parserException;
    }

    
ErrorManager that reports to a StringBuilder. /**
     * {@link ErrorManager} that reports to a {@link StringBuilder}.
     */
    public static class StringBuilderErrorManager extends ErrorManager {
        private final StringBuilder buffer = new StringBuilder(0);

        public StringBuilderErrorManager() {
        }

        @Override
        protected void message(String message) {
            buffer.append(message).append('\n');
        }

        public String getOutput() {
            return buffer.toString();
        }
    }

    
ThrowErrorManager that throws ParserException upon error conditions.
/**
     * ThrowErrorManager that throws ParserException upon error conditions.
     */
    public static class ThrowErrorManager extends ErrorManager {
        @Override
        public void error(final String message) {
            throw new ParserException(message);
        }

        @Override
        public void error(final ParserException e) {
            throw e;
        }

        @Override
        protected void message(String message) {
            System.err.println(message);
        }
    }
}