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package info.bliki.wiki.tags.code;

import java.util.HashMap;

/**
 * Syntax highlighting support for JavaScript source codes
 *
 */
public class JavaScriptCodeFilter extends AbstractCPPBasedCodeFilter implements SourceCodeFormatter {

    private static HashMap KEYWORD_SET = new HashMap<>();

    private static final String[] KEYWORDS = { "abstract", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
            "continue", "debugger", "default", "delete", "do", "double", "else", "enum", "export", "extends", "false", "final",
            "finally", "float", "for", "function", "goto", "if", "implements", "import", "in", "instanceof", "int", "interface", "long",
            "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static", "super", "switch",
            "synchronized", "this", "throw", "throws", "transient", "true", "try", "typeof", "var", "void", "volatile", "while", "with" };

    private static HashMap OBJECT_SET = new HashMap<>();

    static {
        for (int i = 0; i < KEYWORDS.length; i++) {
            createHashMap(KEYWORD_SET, KEYWORDS[i]);
        }
    }

    public JavaScriptCodeFilter() {
    }

    @Override
    public String filter(String input) {
        char[] source = input.toCharArray();
        int currentPosition = 0;
        int identStart = 0;
        char currentChar = ' ';

        HashMap keywordsSet = getKeywordSet();
        HashMap objectsSet = getObjectSet();
        StringBuilder result = new StringBuilder(input.length() + input.length() / 4);
        boolean identFound = false;
        // result.append("");
        try {
            while (true) {
                currentChar = source[currentPosition++];
                if ((currentChar >= 'A' && currentChar <= 'Z') || (currentChar == '_') || (currentChar >= 'a' && currentChar <= 'z')) {
                    identStart = currentPosition - 1;
                    identFound = true;
                    // start of identifier ?
                    while ((currentChar >= 'a' && currentChar <= 'z') || (currentChar >= 'A' && currentChar <= 'Z') || currentChar == '_') {
                        currentChar = source[currentPosition++];
                    }
                    currentPosition = appendIdentifier(input, identStart, currentPosition, keywordsSet, objectsSet, result);
                    identFound = false;
                    continue; // while loop
                } else if (currentChar == '\"') { // strings
                    result.append(FONT_STRINGS);
                    appendChar(result, currentChar);
                    while (currentPosition < input.length()) {
                        currentChar = source[currentPosition++];
                        appendChar(result, currentChar);
                        if (currentChar == '\\') {
                            currentChar = source[currentPosition++];
                            appendChar(result, currentChar);
                            continue;
                        }
                        if (currentChar == '\"') {
                            break;
                        }
                    }
                    result.append(FONT_END);
                    continue;
                } else if (currentChar == '\'') { // strings
                    result.append(FONT_STRINGS);
                    appendChar(result, currentChar);
                    while (currentPosition < input.length()) {
                        currentChar = source[currentPosition++];
                        appendChar(result, currentChar);
                        if (currentChar == '\\') {
                            currentChar = source[currentPosition++];
                            appendChar(result, currentChar);
                            continue;
                        }
                        if (currentChar == '\'') {
                            break;
                        }
                    }
                    result.append(FONT_END);
                    continue;
                } else if (currentChar == '/' && currentPosition < input.length() && source[currentPosition] == '/') {
                    // line comment
                    result.append(FONT_COMMENT);
                    appendChar(result, currentChar);
                    appendChar(result, source[currentPosition++]);
                    while (currentPosition < input.length()) {
                        currentChar = source[currentPosition++];
                        appendChar(result, currentChar);
                        if (currentChar == '\n') {
                            break;
                        }
                    }
                    result.append(FONT_END);
                    continue;
                } else if (currentChar == '/' && currentPosition < input.length() && source[currentPosition] == '*') {
                    if (currentPosition < (input.length() - 1) && source[currentPosition + 1] == '*') {
                        // javadoc style
                        result.append(FONT_JAVADOC);
                    } else {
                        // multiline comment
                        result.append(FONT_COMMENT);
                    }
                    appendChar(result, currentChar);
                    appendChar(result, source[currentPosition++]);
                    while (currentPosition < input.length()) {
                        currentChar = source[currentPosition++];
                        appendChar(result, currentChar);
                        if (currentChar == '/' && source[currentPosition - 2] == '*') {
                            break;
                        }
                    }
                    result.append(FONT_END);
                    continue;
                }
                appendChar(result, currentChar);

            }
        } catch (IndexOutOfBoundsException e) {
            if (identFound) {
                currentPosition = appendIdentifier(input, identStart, currentPosition, keywordsSet, null, result);
            }
        }
        // result.append(FONT_END);
        return result.toString();
    }

    /**
     * @return Returns the KEYWORD_SET.
     */
    @Override
    public HashMap getKeywordSet() {
        return KEYWORD_SET;
    }

    /**
     * @return Returns the OBJECT_SET.
     */
    @Override
    public HashMap getObjectSet() {
        return OBJECT_SET;
    }

}