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package com.redhat.ceylon.common;

import java.util.HashSet;

public class JVMModuleUtil {
    /** Quote the given name by prefixing it with a dollar ($) */
    public static String quote(String name) {
        return "$"+name;
    }

    /** Removes dollar ($) prefix from the given name if it exists */
    public static String unquote(String name) {
        if (!name.isEmpty() && name.charAt(0) == '$') {
            return name.substring(1);
        }
        return name;
    }
    
    private static final HashSet tokens;
    private static final String[] tokensArray =         new String[]{
        "abstract",
        "assert",
        "boolean",
        "break",
        "byte",
        "case",
        "catch",
        "char",
        "class",
        "const",
        "continue",
        "default",
        "do",
        "double",
        "else",
        "enum",
        "extends",
        "final",
        "finally",
        "float",
        "for",
        "goto",
        "if",
        "implements",
        "import",
        "instanceof",
        "int",
        "interface",
        "long",
        "native",
        "new",
        "package",
        "private",
        "protected",
        "public",
        "return",
        "short",
        "static",
        "strictfp",
        "super",
        "switch",
        "synchronized",
        "this",
        "throw",
        "throws",
        "transient",
        "try",
        "void",
        "volatile",
        "while",
        "true",
        "false",
        "null",
    };
    static {
        tokens = new HashSet();
        for (String token : tokensArray) {
            tokens.add(token);
        }
    }
    
    /** Determines whether the given name is a Java keyword */
    public static boolean isJavaKeyword(String name) {
        return tokens.contains(name);
    }

    /** Determines whether the given name is a Java keyword */
    public static boolean isJavaKeyword(String string, int start, int end) {
        int length = end - start;
        OUTER:
        for(int i=0;i 0) {
            firstChar = ceylonRunnableName.charAt(lastDot + 1);
            String lastPart = ceylonRunnableName.substring(lastDot+1);
            String pkgPart = ceylonRunnableName.substring(0, lastDot);
            // only quote the package parts
            ceylonRunnableName = JVMModuleUtil.quoteJavaKeywords(pkgPart) + "." + lastPart;
        }
        // if we have no package part, we don't need quoting
        // we add _ to run class
        return Character.isLowerCase(firstChar) ? ceylonRunnableName + "_" : ceylonRunnableName;
    }
}