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ModelCC is a model-based parser generator (a.k.a. compiler compiler) that decouples language specification from language processing, avoiding some of the problems caused by grammar-driven parser generators. ModelCC receives a conceptual model as input, along with constraints that annotate it. It is then able to create a parser for the desired textual language and the generated parser fully automates the instantiation of the language conceptual model. ModelCC also includes a built-in reference resolution mechanism that results in abstract syntax graphs, rather than mere abstract syntax trees.

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/*
 * ModelCC, distributed under ModelCC Shared Software License, www.modelcc.org
 */

package org.modelcc.lexer.recognizer.regexp;

/**
 * Common regular expressions.
 * 
 * @author Luis Quesada ([email protected]) & Fernando Berzal ([email protected])
 */
public abstract class RegExps
{
    /**
     * Regular expression for double-precision floating-point numbers (in scientific notation), i.e. double.
     */
    public static final String DOUBLE="(-|\\+)?[0-9]+(\\.[0-9]*)?((e|E)(|-|\\+)?[0-9]+)?";

    /**
     * Regular expression for simple-precision floating-point numbers (in scientific notation), i.e. float.
     */
    public static final String FLOAT="(-|\\+)?[0-9]+(\\.[0-9]*)?((e|E)(|-|\\+)?[0-9]+)?";

    /**
     * Regular expression for long integers, i.e. long.
     */
    public static final String LONG="(-|\\+)?[0-9]+";

    /**
     * Regular expression for integers, i.e. int.
     */
    public static final String INT="(-|\\+)?[0-9]+";

    /**
     * Regular expression for short integers, i.e. short.
     */
    public static final String SHORT="(-|\\+)?[0-9]+";

    /**
     * Regular expression for Boolean values.
     */
    public static final String BOOLEAN="true|false";

    /**
     * Regular expression for Java comments.
     */
    public static final String COMMENT="/\\*(?:.|[\\n\\r])*?\\*/";

    /**
     * Regular expression for single-line comments.
     */
    public static final String SINGLE_LINE_COMMENT="(//.*)";

    /**
     * Tab regular expression.
     */
    public static final String TAB="\\t";

    /**
     * Space regular expression.
     */
    public static final String SPACE=" ";

    /**
     * New-line regular expression.
     */
    public static final String NEW_LINE="\\n|\\r";

    /**
     * Whitespace regular expression.
     */
    public static final String WHITESPACE="("+TAB+"|"+SPACE+"|"+NEW_LINE+")+";


    /**
     * Gets the regular expression of the specified Java primitive type.
     * @param c Java primitive type.
     * @return Regular expression of the corresponding Java primitive type.
     */
    public static final String getRegularExpression (Class c) 
    {
        if (c.equals(double.class)) return DOUBLE;
        if (c.equals(Double.class)) return DOUBLE;
        if (c.equals(float.class)) return FLOAT;
        if (c.equals(Float.class)) return FLOAT;
        if (c.equals(long.class)) return LONG;
        if (c.equals(Long.class)) return LONG;
        if (c.equals(int.class)) return INT;
        if (c.equals(Integer.class)) return INT;
        if (c.equals(short.class)) return SHORT;
        if (c.equals(Short.class)) return SHORT;
        if (c.equals(boolean.class)) return BOOLEAN;
        if (c.equals(Boolean.class)) return BOOLEAN;
        return null;
    }

    
}