/*
 * Copyright (C)2005-2017 Haxe Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

@:buildXml('<include name="${HXCPP}/src/hx/libs/regexp/Build.xml"/>')
@:coreApi class EReg {

	var r : Dynamic;
	var last : String;
	var global : Bool;

	public function new( r : String, opt : String ) : Void {
			var a = opt.split("g");
			global = a.length > 1;
			if( global )
				opt = a.join("");
			this.r = _hx_regexp_new_options(r, opt);
	}

	public function match( s : String ) : Bool {
			var p = _hx_regexp_match(r,s,0,s.length);
			if( p )
				last = s;
			else
				last = null;
			return p;
	}

	public function matched( n : Int ) : String {
			var m = _hx_regexp_matched(r,n);
			return m;
	}

	public function matchedLeft() : String {
			var p = _hx_regexp_matched_pos(r,0);
			return last.substr(0,p.pos);
	}

	public function matchedRight() : String {
			var p = _hx_regexp_matched_pos(r,0);
			var sz = p.pos+p.len;
			return last.substr(sz,last.length-sz);
	}

	public function matchedPos() : { pos : Int, len : Int } {
			return _hx_regexp_matched_pos(r,0);
	}

	public function matchSub( s : String, pos : Int, len : Int = -1):Bool {
			var p = _hx_regexp_match(r, s, pos, len < 0 ? s.length - pos : len);
			if (p)
				last = s;
			else
				last = null;
			return p;
	}

	public function split( s : String ) : Array<String> {
			var pos = 0;
			var len = s.length;
			var a = new Array();
			var first = true;
			do {
				if( !_hx_regexp_match(r,s,pos,len) )
					break;
				var p = _hx_regexp_matched_pos(r,0);
				if( p.len == 0 && !first ) {
					if( p.pos == s.length )
						break;
					p.pos += 1;
				}
				a.push(s.substr(pos,p.pos - pos));
				var tot = p.pos + p.len - pos;
				pos += tot;
				len -= tot;
				first = false;
			} while( global );
			a.push(s.substr(pos,len));
			return a;
	}

	public function replace( s : String, by : String ) : String {
			var b = new StringBuf();
			var pos = 0;
			var len = s.length;
			var a = by.split("$");
			var first = true;
			do {
				if( !_hx_regexp_match(r,s,pos,len) )
					break;
				var p = _hx_regexp_matched_pos(r,0);
				if( p.len == 0 && !first ) {
					if( p.pos == s.length )
						break;
					p.pos += 1;
				}
				b.addSub(s,pos,p.pos-pos);
				if( a.length > 0 )
					b.add(a[0]);
				var i = 1;
				while( i < a.length ) {
					var k = a[i];
					var c = k.charCodeAt(0);
					// 1...9
					if( c >= 49 && c <= 57 ) {
						var p = try _hx_regexp_matched_pos(r,Std.int(c)-48) catch( e : String ) null;
						if( p == null ){
							b.add("$");
							b.add(k);
						}else{
						b.addSub(s,p.pos,p.len);
						b.addSub(k,1,k.length - 1);
						}
					} else if( c == null ) {
						b.add("$");
						i++;
						var k2 = a[i];
						if( k2 != null && k2.length > 0 )
							b.add(k2);
					} else
						b.add("$"+k);
					i++;
				}
				var tot = p.pos + p.len - pos;
				pos += tot;
				len -= tot;
				first = false;
			} while( global );
			b.addSub(s,pos,len);
			return b.toString();
	}

	public function map( s : String, f : EReg -> String ) : String {
		var offset = 0;
		var buf = new StringBuf();
		do {
			if (offset >= s.length)
				break;
			else if (!matchSub(s, offset)) {
				buf.add(s.substr(offset));
				break;
			}
			var p = _hx_regexp_matched_pos(r,0);
			buf.add(s.substr(offset, p.pos - offset));
			buf.add(f(this));
			if (p.len == 0) {
				buf.add(s.substr(p.pos, 1));
				offset = p.pos + 1;
			}
			else
				offset = p.pos + p.len;
		} while (global);
		if (!global && offset > 0 && offset < s.length)
			buf.add(s.substr(offset));
		return buf.toString();
	}

	public static function escape( s : String ) : String {
		return escapeRegExpRe.map(s, function(r) return "\\" + r.matched(0));
	}
	static var escapeRegExpRe = ~/[\[\]{}()*+?.\\\^$|]/g;

   @:extern @:native("_hx_regexp_new_options")
	static function _hx_regexp_new_options(s:String, options:String) : Dynamic return null;

   @:extern @:native("_hx_regexp_match")
	static function _hx_regexp_match(handler: Dynamic, string:String, pos:Int, len:Int) : Bool return false;

   @:extern @:native("_hx_regexp_matched")
	static function _hx_regexp_matched(handle:Dynamic, pos:Int) : String return null;

   @:extern @:native("_hx_regexp_matched_pos")
	static function _hx_regexp_matched_pos(handle:Dynamic, match:Int) : {pos:Int, len:Int} return null;
}