--- parser3/src/include/pa_string.h	2001/03/13 14:28:50	1.34
+++ parser3/src/include/pa_string.h	2003/03/21 13:42:29	1.144.2.28.2.17
@@ -1,151 +1,286 @@
-/*
-	Parser
-	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
-	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
+/** @file
+	Parser: string class decl.
 
-	$Id: pa_string.h,v 1.34 2001/03/13 14:28:50 paf Exp $
+	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 */
 
-/*
+#ifndef PA_STRING_H
+#define PA_STRING_H
 
-	String				Chunk0
-	======				========
-	head--------------->[ptr, size, ...]
-	append_here-------->[ptr, size, ...]
-						.
-						.
-						[ptr, size, ...]
-	link_row----------->[link to the next chunk]
+static const char* IDENT_STRING_H="$Date: 2003/03/21 13:42:29 $";
 
+// includes
+
+#include "pa_types.h"
+#include "pa_array.h"
+
+extern "C" { // cord's author forgot to do that
+#include "cord.h"
+};
+
+// forwards
+
+class Charset;
+class Table;
+class SQL_Connection;
+class Dictionary;
+class Request_charsets;
+class String;
+typedef Array<const String*> ArrayString;
+
+// helpers
+/*
+/// appends clean piece to String @see String::append
+#define APPEND_CLEAN(src, length) append(src, length, String::L_CLEAN)
+/// appends piece to String as-is @see String::append
+#define APPEND_AS_IS(src, length) append(src, length, String::L_AS_IS)
+/// appends tainted piece to String  @see String::append
+#define APPEND_TAINTED(src, length) append(src, length, String::L_TAINTED)
+/// handy: appends const char* piece to String  @see String::append
+#define	APPEND_CONST(src) APPEND_AS_IS(src, 0)
 */
+/// this is result of pos functions which mean that substr were not found
+#define STRING_NOT_FOUND ((size_t)-1)
 
-#ifndef PA_STRING_H
-#define PA_STRING_H
+class StringBody {
 
-#ifdef HAVE_CONFIG_H
-#include "pa_config.h"
-#endif
+	CORD body;
 
-#include <stddef.h>
+public:
 
-#include "pa_pool.h"
-#include "pa_types.h"
+	StringBody(): body(CORD_EMPTY) {}
+	StringBody(CORD abody): body(abody) {}
 
-#define UNTAINT_TIMES_BIGGER 10
+	void clear() { body=CORD_EMPTY; }
 
-#ifndef NO_STRING_ORIGIN
-#	define STRING_APPEND_PARAMS \
-		const char *src, size_t size,  \
-		bool tainted, \
-		const char *file, uint line
-#	define APPEND(src, size, file, line) real_append(src, size, false, file, line)
-#	define APPEND_TAINTED(src, size, file, line) real_append(src, size, true, file, line)
-#else
-#	define STRING_APPEND_PARAMS \
-		const char *src, \
-		size_t size, \
-		bool tainted
-#	define APPEND(src, size, file, line) real_append(src, size, false)
-#	define APPEND_TAINTED(src, size, file, line) real_append(src, size, true)
-#endif
-#define	APPEND_CONST(src) APPEND(src, 0, 0, 0)
+	uint hash_code() const;
+
+	size_t length() const { return CORD_len(body); }
+
+	bool is_empty() const { return body==CORD_EMPTY; }
+
+	void append(const char *str, size_t length) {
+		CORD_cat_char_star(body, str, length);
+	}
+	void append(char c) { CORD_cat_char(body, c); }
+
+	// could not figure out why this operator is needed [should do this chain: string->simple->==]
+	bool operator < (const StringBody& src) const { return CORD_cmp(body, src.body)<0; }
+	bool operator > (const StringBody& src) const { return CORD_cmp(body, src.body)>0; }
+	bool operator <= (const StringBody& src) const { return CORD_cmp(body, src.body)<=0; }
+	bool operator >= (const StringBody& src) const { return CORD_cmp(body, src.body)>=0; }
+	bool operator != (const StringBody& src) const { return CORD_cmp(body, src.body)!=0; }
+	bool operator == (const StringBody& src) const { return CORD_cmp(body, src.body)==0; }
+
+//	bool operator == (const char* y) const { return CORD_cmp(body, y)==0; }
+//	bool operator != (const char* y) const { return CORD_cmp(body, y)!=0; }
+
+	int ncmp(size_t x_begin, const StringBody y, size_t y_begin, size_t size) const {
+		return CORD_ncmp(body, x_begin, y.body, y_begin, size);
+	}
+
+	char fetch(size_t index) const { return CORD_fetch(body, index); }
+
+};
+
+/** 
+	String which knows the language of all it's fragments.
+
+	All pieces remember 
+	- whether they are tainted or not, 
+	  and the language which should be used to detaint them
+*/
+class String: public PA_Object {
+
+	friend class StringBody;
 
-class String : public Pooled {
 public:
-	enum {
-		CR_PREALLOCATED_COUNT=5,
-		CR_GROW_PERCENT=60
-	};
 
-	enum Untaint_lang {
-		UNKNOWN=0, // when get by name fails
-		NO, // clean
-		YES,  // tainted, untaint language as assigned later 
+	/** piece is tainted or not. the language to use when detaint
+		remember to change String_Untaint_lang_name @ untaint.C along
+	*/
+	enum Language {
+		L_UNSPECIFIED=0, ///< zero value handy for hash lookup @see untaint_lang_name2enum
+		// these two must go before others, there are checks for >L_AS_IS
+		L_CLEAN, ///< clean
+		L_AS_IS,     ///< leave all characters intact
+
+		L_PASS_APPENDED,
+			/**<
+				leave language built into string being appended.
+				just a flag, that value not stored
+			*/
+		L_TAINTED,  ///< tainted, untaint language as assigned later 
 		// untaint languages. assigned by ^untaint[lang]{...}
-		PASS_APPENDED,
-			// leave language built into string being appended
-			// just a flag, that value not stored
-		AS_IS,
-		TABLE,
-		SQL,
-		JS,
-		HTML,
-		HTML_TYPO
+		L_FILE_SPEC, ///< file specification
+		L_HTTP_HEADER,    ///< text in HTTP response header
+		L_MAIL_HEADER,    ///< text in mail header
+		L_URI,       ///< text in uri
+		L_TABLE,     ///< ^table:set body
+		L_SQL,       ///< ^table:sql body
+		L_JS,        ///< JavaScript code
+		L_XML,		///< ^dom:set xml
+		L_HTML,      ///< HTML code (for editing)
+		L_OPTIMIZE_BIT = 0x8000  ///< flag, requiring cstr whitespace optimization
 	};
 
-public:
+	struct Fragment { 
+		Language lang; ///< untaint flag, later untaint language
+		size_t length;  ///< length
+		Fragment(Language alang, size_t asize): lang(alang), length(asize) {}
+	};
 
-	String(Pool& apool);
-	String(const String& src);
-	size_t size() const { return fsize; }
-	int used_rows() const { return fused_rows; }
-	char *cstr() const;
-	String& real_append(STRING_APPEND_PARAMS);
-	int cmp (const String& src) const;
-	bool operator < (const String& src) const {	return cmp(src)<0; }
-	bool operator > (const String& src) const {	return cmp(src)>0; }
-	bool operator <= (const String& src) const { return cmp(src)<=0; }
-	bool operator >= (const String& src) const { return cmp(src)>=0; }
-	bool operator == (const String& src) const {
-		if(size()!=src.size()) // can speed up in trivial case
-			return false;
-		return cmp(src)==0;
-	}
-	bool operator != (const String& src) const { return cmp(src)!=0; }
+	class ArrayFragment: public Array<Fragment> {
+		void append(element_type src) {
+			*static_cast<Array<Fragment> *>(this)+=src;
+		}
+		/// hiding from accidental USE, use append_positions
+		void append(const ArrayFragment& src, int offset, int limit) { 
+			static_cast<Array<Fragment> *>(this)->append(src, offset, limit);
+		}
+	public:
+		ArrayFragment& operator += (element_type src) {
+			if(count()) { // not empty?
+				// try to join with last
+				Fragment& last=get(count()-1);
+				if(last.lang==src.lang) {
+					last.length+=src.length;
+					return *this;
+				}
+			}
+			append(src);
+			return *this;
+		}
+		void append(const ArrayFragment& src) { append(src, 0, 0); }
+		void append_positions(const ArrayFragment& src, size_t substr_begin, size_t substr_end);
+	};
 
-	bool operator == (const char* b_ptr) const;
-	String& append(const String& src, Untaint_lang lang);
+	struct C {
+		char *str;
+		size_t length;
+		operator char *() { return str; }
+		C(char *astr, size_t asize): str(astr), length(asize) {}
+	};
 
-	uint hash_code() const;
+private:
 
-	const Origin& origin() const { return head.rows[0].item.origin; }
+	StringBody body; ///< all characters of string
+	ArrayFragment fragments; ///< fragment language+length info
 
-private:
+public:
 
-	struct Chunk {
-		// the number of rows in chunk
-		int count;
-		union Row {
-			// fragment
-			struct { 
-				const char *ptr;  // pointer to the start
-				size_t size;  // length
-				Untaint_lang lang; // untaint flag, later untaint language
-#ifndef NO_STRING_ORIGIN
-				Origin origin;  // origin
-#endif
-			} item;
-			Chunk *link;  // link to the next chunk in chain
-		} rows[CR_PREALLOCATED_COUNT];
-		// next rows are here
-		Chunk *preallocated_link;
-	}
-		head;  // the head chunk of the chunk chain
-
-	// 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;
+	/// @todo check all places for length to be only HELPER length, and never be !=strlen(cstr)
+	explicit String(const char* cstr=0, size_t helper_length=0, bool tainted=false);
+	String(const String& src);
+	String(StringBody abody, Language alang): body(abody) {
+		fragments+=Fragment(alang, abody.length());
+	}
 
-private:
-	// last chunk
-	Chunk *last_chunk;
+	/// for convinient hash lookup
+	operator StringBody() const { return body; }
 
-	// string size
-	size_t fsize;
+	bool is_empty() const { return body.is_empty(); }
+	size_t length() const { return body.length(); }
 
-	// used rows in all chunks
-	int fused_rows;
+	/// convert to CORD. if 'lang' known, forcing 'lang' to it
+	CORD cstr_to_cord(Language lang=L_AS_IS, 
+		SQL_Connection* connection=0,
+		const Request_charsets *charsets=0) const;
+
+	/// convert to constant C string. if 'lang' known, forcing 'lang' to it
+	const char* cstr(Language lang=L_AS_IS, 
+		SQL_Connection* connection=0,
+		const Request_charsets *charsets=0) const {
+		return CORD_to_const_char_star(cstr_to_cord(lang, connection, charsets));
+	}
+	/// convert to Modifiable C string. if 'lang' known, forcing 'lang' to it
+	char *cstrm(Language lang=L_AS_IS, 
+		SQL_Connection* connection=0,
+		const Request_charsets *charsets=0) const {
+		return CORD_to_char_star(cstr_to_cord(lang, connection, charsets));
+	}
+	/// puts pieces to buf
+	C serialize(size_t prolog_size) const;
+	/// appends pieces from buf to self
+	bool deserialize(size_t prolog_size, void *buf, size_t buf_size, const char* file);
+	/** append fragment, 
+		@c helper_length can be zero, it will be autocalced
+		when length<strlen(str) makes heap copy of @c str piece
+	*/
+	String& append(const char* str, size_t helper_length, Language lang);
+
+	bool operator == (const char* y) const { return body==StringBody(y); }
+
+	/// this starts with y
+	bool starts_with(const char* y) const {
+		return body.ncmp(0/*x_begin*/, StringBody(y), 0/*y_begin*/, strlen(y))==0;
+	}
+	/// y starts with this
+	bool this_starts(const char* y) const {
+		return body.ncmp(0/*x_begin*/, StringBody(y), 0/*y_begin*/, strlen(y))==0;
+	}
 
-private:
+	String& append_to(String& dest, Language lang, bool forced) const;
+	String& append(const String& src, Language lang, bool forced=false) { 
+		return src.append_to(*this, lang, forced);
+	}
+	String& operator << (const String& src) { return append(src, L_PASS_APPENDED); }
+	String& operator << (const char* src) { return append(src, 0, L_AS_IS); }
 
-	bool chunk_is_full() {
-		return append_here == link_row;
+	/// extracts first char of a string, if any
+	char first_char() const {
+		return is_empty()?0:body.fetch(0);
 	}
-	void expand();
-	void set_lang(Chunk::Row *row, Untaint_lang lang, size_t size);
+
+	/// extracts [start, finish) piece of string
+	const String& mid(size_t substr_begin, size_t substr_end) const;
+
+	/** 
+		ignore lang if it's L_UNSPECIFIED
+		but when specified: look for substring that lies in ONE fragment in THAT lang
+		@return position of substr in string, -1 means "not found" [const char* version]
+	*/
+	size_t pos(CORD substr, 
+		size_t this_offset=0, Language lang=L_UNSPECIFIED) const;
+	/// String version of @see pos(const char*, int, Language)
+	size_t pos(const String& substr, 
+		size_t this_offset=0, Language lang=L_UNSPECIFIED) const;
+
+	void split(ArrayString& result, 
+		size_t& pos_after, 
+		const char* delim, 
+		Language lang=L_UNSPECIFIED, int limit=-1);
+	void split(ArrayString& result, 
+		size_t& pos_after, 
+		const String& delim, 
+		Language lang=L_UNSPECIFIED, int limit=-1) const;
+
+	typedef void (*Row_action)(Table* table, ArrayString* row, 
+		int prestart, int prefinish, 
+		int poststart, int postfinish,
+		void *info);
+	/**
+		@return table of found items, if any.
+		table format is defined and fixed[can be used by others]: 
+		@verbatim
+			prematch/match/postmatch/1/2/3/...
+		@endverbatim
+	*/
+	Table* match(Charset& source_charset,
+		const String& regexp, 
+		const String& options,
+		Row_action row_action, void *info,
+		bool& just_matched) const;
+	enum Change_case_kind {
+		CC_UPPER,
+		CC_LOWER
+	};
+	String& change_case(Charset& source_charset,
+		Change_case_kind kind);
+	const String& replace(const Dictionary& dict) const;
+	double as_double() const;
+	int as_int() const;
 
 private: //disabled
 
@@ -153,4 +288,9 @@ private: //disabled
 
 };
 
+/// simple hash code of string. used by Hash
+inline uint hash_code(const StringBody& self) {
+	return self.hash_code();
+}
+
 #endif