--- parser3/src/include/pa_string.h	2002/02/20 09:13:07	1.125
+++ parser3/src/include/pa_string.h	2002/02/20 12:40:24	1.129
@@ -4,7 +4,7 @@
 	Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
 	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 
-	$Id: pa_string.h,v 1.125 2002/02/20 09:13:07 paf Exp $
+	$Id: pa_string.h,v 1.129 2002/02/20 12:40:24 paf Exp $
 */
 
 #ifndef PA_STRING_H
@@ -109,6 +109,7 @@ public:
 
 	String(Pool& apool, const char *src=0, size_t src_size=0, bool tainted=false);
 	String(const String& src);
+	bool is_empty() const { return append_here==head.rows; }
 	size_t size() const;
 	/// convert to C string. if 'lang' known, forcing 'lang' to it
 	char *cstr(Untaint_lang lang=UL_AS_IS, 
@@ -225,10 +226,14 @@ public:
 	const Origin& origin() const;
 #endif
 
-public: // debug private:
+private:
 
-	/// several String fragments
-	struct Chunk {
+	/** several String fragments
+		
+		'mutable' because can write after it's end, after it was appended to somebody 
+		@see String::append
+	*/
+	mutable struct Chunk {
 		typedef uchar count_type;
 		count_type count; ///< the number of rows in chunk
 		/// string fragment or a link to next chunk union
@@ -247,28 +252,21 @@ public: // debug private:
 		} rows[CR_PREALLOCATED_COUNT];
 	}
 		head;  ///< the head chunk of the chunk chain
-	Chunk *head_link; ///< next rows are here must go right after 'head'
+	Chunk *initial_head_link; ///< next rows initially are here[can shrink! @see String::append]. must go right after 'head'
 
 	/// next append would write to this record
 	Chunk::Row *append_here;
 	
-	/** the address of place where lies address 
-		of the link to the next chunk to allocate
-	*/
-	Chunk::Row *link_row;
-
 private:
 	/// last chunk
 	mutable Chunk *last_chunk;
 
-public: //debug
-	uint used_rows() const;
 private:
 
 	bool chunk_is_full() {
-		return append_here == link_row;
+		return append_here == last_chunk->rows+last_chunk->count;
 	}
-	//uint used_rows() const;
+	uint used_rows() const;
 	void expand();
 	
 	Untaint_lang lang_of(size_t offset) const;