BEGIN LICENSE BLOCK *****
Version: EPL 2.0/GPL 2.0/LGPL 2.1
The contents of this file are subject to the Eclipse Public
License Version 2.0 (the "License"); you may not use this file
except in compliance with the License. You may obtain a copy of
the License at http://www.eclipse.org/legal/epl-v20.html
Software distributed under the License is distributed on an "AS
IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
implied. See the License for the specific language governing
rights and limitations under the License.
Copyright (C) 2016 The JRuby Team
Alternatively, the contents of this file may be used under the terms of
either of the GNU General Public License Version 2 or later (the "GPL"),
or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
in which case the provisions of the GPL or the LGPL are applicable instead
of those above. If you wish to allow use of your version of this file only
under the terms of either the GPL or the LGPL, and not to allow others to
use your version of this file under the terms of the EPL, indicate your
decision by deleting the provisions above and replace them with the notice
and other provisions required by the GPL or the LGPL. If you do not delete
the provisions above, a recipient may use your version of this file under
the terms of any one of the EPL, the GPL or the LGPL.
END LICENSE BLOCK /***** BEGIN LICENSE BLOCK *****
 * Version: EPL 2.0/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Eclipse Public
 * License Version 2.0 (the "License"); you may not use this file
 * except in compliance with the License. You may obtain a copy of
 * the License at http://www.eclipse.org/legal/epl-v20.html
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * Copyright (C) 2016 The JRuby Team
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the EPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the EPL, the GPL or the LGPL.
 ***** END LICENSE BLOCK *****/

package org.jruby.javasupport.ext;

import org.jruby.*;
import org.jruby.anno.JRubyClass;
import org.jruby.anno.JRubyMethod;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;

import static org.jruby.javasupport.JavaUtil.convertJavaToUsableRubyObject;
import static org.jruby.javasupport.JavaUtil.unwrapJavaObject;

Java::JavaLangReflect package extensions.
Author:
kares/**
 * Java::JavaLangReflect package extensions.
 *
 * @author kares
 */
public abstract class JavaUtilRegex {

    public static void define(final Ruby runtime) {
        JavaExtensions.put(runtime, java.util.regex.Pattern.class, (proxyClass) -> Pattern.define(runtime, (RubyClass) proxyClass));
        JavaExtensions.put(runtime, java.util.regex.Matcher.class, (proxyClass) -> Matcher.define(runtime, (RubyClass) proxyClass));
    }

    @JRubyClass(name = "Java::JavaUtilRegex::Pattern")
    public static class Pattern {

        static RubyClass define(final Ruby runtime, final RubyClass proxy) {
            proxy.defineAnnotatedMethods(Pattern.class);
            return proxy;
        }

        @JRubyMethod(name = "=~", required = 1)
        public static IRubyObject op_match(final ThreadContext context, final IRubyObject self, IRubyObject str) {
            final java.util.regex.Matcher matcher = matcher(self, str);
            return matcher.find() ? context.runtime.newFixnum(matcher.start()) : context.nil;
        }

        @JRubyMethod(name = "match", required = 1)
        public static IRubyObject match(final ThreadContext context, final IRubyObject self, IRubyObject str) {
            final java.util.regex.Matcher matcher = matcher(self, str);
            if ( ! matcher.find() ) return context.nil;
            final RubyObject matcherProxy = (RubyObject) convertJavaToUsableRubyObject(context.runtime, matcher);
            matcherProxy.setInternalVariable("str", str); // matcher.str = str
            return matcherProxy;
        }

        @JRubyMethod(name = "===", required = 1)
        public static IRubyObject eqq(final ThreadContext context, final IRubyObject self, IRubyObject str) {
            return RubyBoolean.newBoolean(context,  matcher(self, str).find() );
        }

        @JRubyMethod(name = "casefold?")
        public static IRubyObject casefold_p(final ThreadContext context, final IRubyObject self) {
            final java.util.regex.Pattern regex = unwrapJavaObject(self);
            boolean i = ( regex.flags() & java.util.regex.Pattern.CASE_INSENSITIVE ) != 0;
            return RubyBoolean.newBoolean(context, i);
        }

        private static java.util.regex.Matcher matcher(final IRubyObject self, final IRubyObject str) {
            final java.util.regex.Pattern regex = unwrapJavaObject(self);
            return regex.matcher((CharSequence) str.toJava(CharSequence.class));
        }

    }

    @JRubyClass(name = "Java::JavaUtilRegex::Matcher")
    public static class Matcher {

        static RubyClass define(final Ruby runtime, final RubyClass proxy) {
            proxy.defineAnnotatedMethods(Matcher.class);
            return (RubyClass) proxy;
        }

        @JRubyMethod
        public static IRubyObject regexp(final ThreadContext context, final IRubyObject self) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            return convertJavaToUsableRubyObject(context.runtime, matcher.pattern());
        }

        @JRubyMethod
        public static IRubyObject begin(final ThreadContext context, final IRubyObject self, final IRubyObject idx) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            if ( idx instanceof RubySymbol ) {
                return context.runtime.newFixnum( matcher.start(idx.toString()) );
            }
            final int group = idx.convertToInteger().getIntValue();
            return context.runtime.newFixnum( matcher.start(group) );
        }

        @JRubyMethod
        public static IRubyObject end(final ThreadContext context, final IRubyObject self, final IRubyObject idx) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            if ( idx instanceof RubySymbol ) {
                return context.runtime.newFixnum( matcher.end(idx.toString()) );
            }
            final int group = idx.convertToInteger().getIntValue();
            return context.runtime.newFixnum(matcher.end(group));
        }

        @JRubyMethod
        public static IRubyObject offset(final ThreadContext context, final IRubyObject self, final IRubyObject idx) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            final IRubyObject beg; final IRubyObject end;
            if ( idx instanceof RubySymbol ) {
                beg = context.runtime.newFixnum( matcher.start(idx.toString()) );
                end = context.runtime.newFixnum( matcher.end(idx.toString()) );
            }
            else {
                final int group = idx.convertToInteger().getIntValue();
                beg = context.runtime.newFixnum( matcher.start(group) );
                end = context.runtime.newFixnum( matcher.end(group) );
            }
            return RubyArray.newArray(context.runtime, beg, end);
        }

        @JRubyMethod(name = { "length", "size" })
        public static RubyFixnum size(final ThreadContext context, final IRubyObject self) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            return context.runtime.newFixnum(matcher.groupCount() + 1); // the Ruby way!
        }

        @JRubyMethod
        public static RubyString string(final ThreadContext context, final IRubyObject self) {
            return str(context, self);
        }

        private static RubyString str(final ThreadContext context, final IRubyObject self) {
            final IRubyObject str = (IRubyObject) self.getInternalVariables().getInternalVariable("str");
            return /* str == null ? string(context, self) : */ str.convertToString();
        }

        @JRubyMethod // str[ 0..start(0) ]
        public static IRubyObject pre_match(final ThreadContext context, final IRubyObject self) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            return str(context, self).substr(context.runtime, 0, matcher.start(0));
        }

        @JRubyMethod // str[ end(0)..-1 ]
        public static IRubyObject post_match(final ThreadContext context, final IRubyObject self) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            final RubyString str = str(context, self);
            final int offset = matcher.end(0);
            return str.substr(context.runtime, offset, str.size() - offset);
        }

        @JRubyMethod
        public static RubyArray to_a(final ThreadContext context, final IRubyObject self) {
            return RubyArray.newArrayMayCopy(context.runtime, groups(context, self, 0));
        }

        @JRubyMethod
        public static RubyArray captures(final ThreadContext context, final IRubyObject self) {
            return RubyArray.newArrayMayCopy(context.runtime, groups(context, self, 1));
        }

        private static IRubyObject[] groups(final ThreadContext context, final IRubyObject self, final int off) {
            final Ruby runtime = context.runtime;
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            final IRubyObject[] arr = new IRubyObject[ matcher.groupCount() - off + 1 ];
            for ( int i = 0; i < arr.length; i++ ) {
                if ( matcher.start(i + off) == -1 ) {
                    arr[i] = context.nil;
                }
                else {
                    arr[i] = runtime.newString(matcher.group(i + off));
                }
            }
            return arr;
        }

        @JRubyMethod(name = "[]", required = 1)
        public static IRubyObject aref(final ThreadContext context, final IRubyObject self, final IRubyObject idx) {
            final java.util.regex.Matcher matcher = unwrapJavaObject(self);
            if ( idx instanceof RubySymbol || idx instanceof RubyString ) {
                return context.runtime.newString( matcher.group(idx.toString()) );
            }
            if ( idx instanceof RubyInteger ) {
                final int group = ((RubyInteger) idx).getIntValue();
                return context.runtime.newString( matcher.group(group) );
            }
            return to_a(context, self).aref(idx); // Range
        }

        @JRubyMethod(name = "[]", required = 2)
        public static IRubyObject aref(final ThreadContext context, final IRubyObject self,
            final IRubyObject arg0, final IRubyObject arg1) {
            return to_a(context, self).aref(arg0, arg1);
        }

        @JRubyMethod(rest = true)
        public static IRubyObject values_at(final ThreadContext context, final IRubyObject self, final IRubyObject[] args) {
            return to_a(context, self).values_at(args);
        }

    }

}