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/** @file
	Parser: string class. @see untalength_t.C.

	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

static const char* IDENT_STRING_C="$Date: 2003/07/24 11:31:24 $";

#include "pcre.h"

#include "pa_string.h"
#include "pa_exception.h"
#include "pa_table.h"
#include "pa_dictionary.h"
#include "pa_charset.h"

// helpers

/// String::match uses this as replace & global search table columns

const int MAX_MATCH_GROUPS=100;

class String_match_table_template_columns: public ArrayString {
public:
	String_match_table_template_columns() {
		*this+=new String("prematch");
		*this+=new String("match");
		*this+=new String("postmatch");
		for(int i=0; i<MAX_MATCH_GROUPS; i++) {
			*this+=new String(StringBody::Format(1+i), String::L_CLEAN);
		}
	}
};

Table string_match_table_template(new String_match_table_template_columns);

// String::ArrayFragment methods

void String::ArrayFragment::append_positions(const ArrayFragment& src, 
					     size_t substr_begin, size_t substr_end) {
	if(substr_begin==substr_end)
		return;

//	FILE *err=fopen("append.log", "wt");

	size_t fragment_begin=0;
	size_t fragment_end;
	for(Array_iterator<element_type> i(src); ; fragment_begin=fragment_end) {
		const Fragment fragment=i.next();
		fragment_end=fragment_begin+fragment.length;		
		//fprintf(err, "1end=%u\n", fragment_end);fflush(err);

		// not reached fragments which may include 'substr'?
		if(!(substr_begin>=fragment_begin && substr_begin<fragment_end))
			continue;

		// found first fragment including piece of 'substr'
		if(substr_end<=fragment_end) // fits into first fragment?
			*this+=Fragment(fragment.lang, substr_end-substr_begin);
		else { // spans more then one fragment
			*this+=Fragment(fragment.lang, fragment_end-substr_begin);
			while(true) {
				const Fragment fragment=i.next();
				fragment_end=(fragment_begin=fragment_end)+fragment.length;
				//fprintf(err, "2end=%u\n", fragment_end);fflush(err);

				if(substr_end>fragment_end) // are there still more?
					append(Fragment(fragment.lang, fragment.length)); // appending whole fragment
				else { // no, it was last
					append(Fragment(fragment.lang, substr_end-fragment_begin));
					//fclose(err);
					return;
				}
			}
		}

		break;
	}
	//fclose(err);
}

// StringBody methods

StringBody StringBody::Format(int value) {
	char local[MAX_NUMBER];
	size_t length=snprintf(local, MAX_NUMBER, "%d", value);
	return StringBody(pa_strdup(local, length), length);
}

static int CORD_batched_iter_fn_generic_hash_code(char c, void * client_data) {
	uint& result=*static_cast<uint*>(client_data);
	generic_hash_code(result, c);
	return 0;
}
static int CORD_batched_iter_fn_generic_hash_code(const char*  s, void * client_data) {
	uint& result=*static_cast<uint*>(client_data);
	generic_hash_code(result, s);
	return 0;
};
uint StringBody::hash_code() const {
	uint result=0;
	CORD_iter5(body, 0,
		CORD_batched_iter_fn_generic_hash_code, 
		CORD_batched_iter_fn_generic_hash_code, &result);
	return result;
}

// String methods

String::String(const char* cstr, size_t helper_length, bool tainted): body(CORD_EMPTY) {
	append_help_length(cstr, helper_length, tainted?L_TAINTED:L_CLEAN);
}
String::String(const String::C cstr, bool tainted): body(CORD_EMPTY) {
	append_know_length(cstr.str, cstr.length, tainted?L_TAINTED:L_CLEAN);
}

String::String(const String& src): body(src.body) {
	fragments.append(src.fragments);
	ASSERT_STRING_INVARIANT(*this);
}

String& String::append_know_length(const char* str, size_t known_length, Language lang) {
	if(!known_length)
		return *this;

	body.append_know_length(str, known_length);
	fragments+=Fragment(lang, known_length);

	ASSERT_STRING_INVARIANT(*this);
	return *this;
}
String& String::append_help_length(const char* str, size_t helper_length, Language lang) {
	if(!str)
		return *this;
	size_t known_length=helper_length?helper_length:strlen(str);
	if(!known_length)
		return *this;

	return append_know_length(str, known_length, lang);
}
String& String::append_strdup(const char* str, size_t helper_length, Language lang) {
	size_t known_length=helper_length?helper_length:strlen(str);
	if(!known_length)
		return *this;

	body.append_strdup_know_length(str, known_length);
	fragments+=Fragment(lang, known_length);

	ASSERT_STRING_INVARIANT(*this);
	return *this;
}

/// @todo check in doc: whether it documents NOW bad situation "abc".mid(-1, 3) =were?="ab"
String& String::mid(size_t substr_begin, size_t substr_end) const {
	String& result=*new String;

	size_t self_length=length();
	substr_begin=min(substr_begin, self_length);
	substr_end=min(max(substr_end, substr_begin), self_length);
	if(substr_begin==substr_end)
		return result;

	// first: letters themselves
	result.body=body.mid(substr_begin, substr_end-substr_begin);

	// next: their langs
	result.fragments.append_positions(fragments, substr_begin, substr_end);

//	SAPI::log("piece of '%s' from %d to %d is '%s'",
		//cstr(), substr_begin, substr_end, result.cstr());
	ASSERT_STRING_INVARIANT(result);
	return result;
}

size_t String::pos(const StringBody substr, 
		   size_t this_offset, Language lang) const {
	// first: letters themselves
	size_t substr_begin=body.pos(substr, this_offset);
	if(substr_begin==CORD_NOT_FOUND)
		return STRING_NOT_FOUND;

	// next: check the lang when specified

	if(lang==L_UNSPECIFIED) // ignore lang?
		return substr_begin;

	// substr must be in one fragment, and fragments' lang must = lang
	size_t substr_end=substr_begin+substr.length();
	size_t fragment_begin=0;
	size_t fragment_end;
	for(Array_iterator<ArrayFragment::element_type> i(fragments); i.has_next(); fragment_begin=fragment_end) {
		const Fragment fragment=i.next();
		fragment_end=fragment_begin+fragment.length;

		if(substr_begin<fragment_begin) // not reached fragments which may include 'result'?
			continue;
		if(substr_begin>=fragment_end) // begin of substr OUT of current fragment?
			continue;
		
		if(substr_end>fragment_end) // end of substr OUT of current fragment?
			throw Exception(0, // (*) see below
				this,
				"searching for '%s' starting from %ud problem: found begin in one fragment, but end in another",
					substr.cstr(), this_offset);

		if(fragment.lang<=lang)
			return substr_begin;
		else { // bad lang...
			/// WARNING: this possibly skips assert (*), but it's fast
			substr_begin=body.pos(substr, fragment_end/*...search AFTER for more*/);
			if(substr_begin==CORD_NOT_FOUND)
				return STRING_NOT_FOUND;

			size_t substr_end=substr_begin+substr.length();
			// and continuing with next fragment
		}
	}	

	return STRING_NOT_FOUND;
}

size_t String::pos(const String& substr, 
				size_t this_offset, Language lang) const {
	return pos(substr.body, this_offset, lang);
}

void String::split(ArrayString& result, 
		   size_t& pos_after, 
		   const char* delim, 
		   Language lang, int limit) const {
	size_t self_length=length();
	if(size_t delim_length=strlen(delim)) {
		int pos_before;
		// while we have 'delim'...
		for(; (pos_before=pos(delim, pos_after, lang))!=STRING_NOT_FOUND && limit; limit--) {
			result+=&mid(pos_after, pos_before);
			pos_after=pos_before+delim_length;
		}
		// last piece
		if(pos_after<self_length && limit) {
			result+=&mid(pos_after, self_length);
			pos_after=self_length;
		}
	} else { // empty delim
		result+=this;
		pos_after+=self_length;
	}
}

void String::split(ArrayString& result, 
		   size_t& pos_after, 
		   const String& delim, Language lang, 
		   int limit) const {
	if(!delim.is_empty()) {
		int pos_before;
		// while we have 'delim'...
		for(; (pos_before=pos(delim, pos_after, lang))!=STRING_NOT_FOUND && limit; limit--) {
			result+=&mid(pos_after, pos_before);
			pos_after=pos_before+delim.length();
		}
		// last piece
		if(pos_after<length() && limit) {
			result+=&mid(pos_after, length());
			pos_after=length();
		}
	} else { // empty delim
		result+=this;
		pos_after+=length();
	}
}

static void regex_options(const String* options, int *result, bool& need_pre_post_match){
    struct Regex_option {
		const char* keyL;
		const char* keyU;
		int clear, set;
		int *result;
		bool *flag;
    } regex_option[]={
		{"i", "I", 0, PCRE_CASELESS, result}, // a=A
		{"s", "S", 0, PCRE_DOTALL, result}, // \n\n$ [default]
		{"x", "U", 0, PCRE_EXTENDED, result}, // whitespace in regex ignored
		{"m", "M", PCRE_DOTALL, PCRE_MULTILINE, result}, // ^aaa\n$^bbb\n$
		{"g", "G", 0, true, result+1}, // many rows
		{"'", 0, 0, 0, 0, &need_pre_post_match},
		{0}
    };
	result[0]=PCRE_EXTRA | PCRE_DOTALL | PCRE_DOLLAR_ENDONLY;
	result[1]=0;

    if(options && !options->is_empty()) 
		for(Regex_option *o=regex_option; o->keyL; o++) 
			if(options->pos(o->keyL)!=STRING_NOT_FOUND
				|| (o->keyU && options->pos(o->keyU)!=STRING_NOT_FOUND)) {
				if(o->flag)
					*o->flag=true;
				else { // result
					*o->result &= ~o->clear;
					*o->result |= o->set;
				}
			}
}

Table* String::match(Charset& source_charset,
		     const String& regexp, 
		     const String* options,
		     Row_action row_action, void *info,
		     bool& just_matched) const { 
	if(regexp.is_empty())
		throw Exception(0,
			0,
			"regexp is empty");

	const char* pattern=regexp.cstr();
	const char* errptr;
	int erroffset;
	bool need_pre_post_match=false;
	int option_bits[2]={0};  regex_options(options, option_bits, need_pre_post_match);
	bool global=option_bits[1]!=0;
	pcre *code=pcre_compile(pattern, option_bits[0], 
		&errptr, &erroffset,
		source_charset.pcre_tables);

	if(!code)
		throw Exception(0,
			&regexp.mid(erroffset, regexp.length()),
			"regular expression syntax error - %s", errptr);
	
	int subpatterns=pcre_info(code, 0, 0);
	if(subpatterns<0) {
		pcre_free(code);
		throw Exception(0,
			&regexp,
			"pcre_info error (%d)", 
				subpatterns);
	}

	const char* subject=cstr();
	size_t subject_length=strlen(subject);
	const int oveclength=(1/*match*/+MAX_MATCH_GROUPS)*3;
	int ovector[oveclength];

	// create table
	Table::Action_options table_options;
	Table& table=*new Table(string_match_table_template, table_options);

	int exec_option_bits=0;
	int prestart=0;
	int poststart=0;
	int postfinish=length();
	while(true) {
		int exec_substrings=pcre_exec(code, 0,
			subject, subject_length, prestart,
			exec_option_bits, ovector, oveclength);
		
		if(exec_substrings==PCRE_ERROR_NOMATCH) {
			pcre_free(code);
			row_action(table, 0/*last time, no raw*/, 0, 0, poststart, postfinish, info);
			if(global || subpatterns)
				return &table; // global or with subpatterns=true+result
			else {
				just_matched=false; return 0; // not global=no result
			}
		}

		if(exec_substrings<0) {
			pcre_free(code);
			throw Exception(0,
				&regexp,
				"regular expression execute error (%d)", 
					exec_substrings);
		}

		int prefinish=ovector[0];
		poststart=ovector[1];
		ArrayString* row=new ArrayString;
		if(need_pre_post_match) {
			*row+=&mid(0, prefinish); // .prematch column value
			*row+=&mid(prefinish, poststart); // .match
			*row+=&mid(poststart, postfinish); // .postmatch
		} else {
			*row+=0; // .prematch column value
			*row+=0; // .match
			*row+=0; // .postmatch
		}
		
		for(int i=1; i<exec_substrings; i++) {
			// -1:-1 case handled peacefully by mid() itself
			*row+=&mid(ovector[i*2+0], ovector[i*2+1]); // .i column value
		}
		
		row_action(table, row, prestart, prefinish, poststart, postfinish, info);

		if(!global || prestart==poststart) { // not global | going to hang
			pcre_free(code);
			row_action(table, 0/*last time, no row*/, 0, 0, poststart, postfinish, info);
			return &table;
		}
		prestart=poststart;

/*
		if(option_bits[0] & PCRE_MULTILINE)
			exec_option_bits|=PCRE_NOTBOL; // start of subject+startoffset not BOL
*/
	}
}

String& String::change_case(Charset& source_charset, Change_case_kind kind) const {
	String& result=*new String();
	if(is_empty())
		return result;

	const unsigned char *tables=source_charset.pcre_tables;

	const unsigned char *a;
	const unsigned char *b;
	switch(kind) {
	case CC_UPPER:
		a=tables+lcc_offset;
		b=tables+fcc_offset;
		break;
	case CC_LOWER:
		a=tables+lcc_offset;
		b=0;
		break;
	default:
		throw Exception(0, 
			this, 
			"unknown change case kind #%d", 
				static_cast<int>(kind)); // never
		a=b=0; // calm, compiler
		break; // never
	}	

	char* new_cstr=cstrm();
	char *dest=new_cstr;
	unsigned char index;
	for(const char* current=new_cstr; index=(unsigned char)*current; current++) {
		unsigned char c=a[index];
		if(b)
			c=b[c];

		*dest++=(char)c;
	}
	result.body=new_cstr;
	result.fragments.append(fragments);

	return result;
}

const String& String::replace(const Dictionary& dict) const {
	String& result=*new String();
	const char* old_cstr=cstr();
	const char* prematch_begin=old_cstr;

	const char* current=old_cstr;
	while(*current) {
		if(Table::element_type row=dict.first_that_begins(current)) {
			// prematch
			if(size_t prematch_length=current-prematch_begin) {
				result.body.append_strdup_know_length(prematch_begin, prematch_length);
				result.fragments.append_positions(fragments, prematch_begin-old_cstr, current-old_cstr);
			}

			// match

			const String* a=row->get(0);
			// skip 'a' in 'current'; move prematch_begin
			current+=a->length(); prematch_begin=current;

			if(row->count()>1) { // are there any b?
				const String* b=row->get(1);
				result<<*b;
			}
		} else // simply advance
			current++; 
	}

	// postmatch
	if(size_t postmatch_length=current-prematch_begin) {
		result.body.append_strdup_know_length(prematch_begin, postmatch_length);
		result.fragments.append_positions(fragments, prematch_begin-old_cstr, current-old_cstr);
	}

	ASSERT_STRING_INVARIANT(result);
	return result;
}

double String::as_double() const { 
	double result;
	const char *str=cstr();

	while(*str && isspace(*str))
		str++;
	if(!*str)
		return 0;

	char *error_pos;
	// 0xABC
	if(str[0]=='0')
		if(str[1]=='x' || str[1]=='X')
			result=(double)(unsigned long)strtol(str, &error_pos, 0);
		else
			result=(double)strtod(str+1/*skip leading 0*/, &error_pos);
	else
		result=(double)strtod(str, &error_pos);

	while(char c=*error_pos++)
		if(!isspace(c))
			throw Exception("number.format",
				this,
				"invalid number (double)");

	return result;
}
int String::as_int() const { 
	int result;
	const char *str=cstr();

	while(*str && isspace(*str))
		str++;
	if(!*str)
		return 0;

	char *error_pos;
	// 0xABC
	if(str[0]=='0')
		if(str[1]=='x' || str[1]=='X')
			result=(int)(unsigned long)strtol(str, &error_pos, 0);
		else
			result=(int)strtol(str+1/*skip leading 0*/, &error_pos, 0);
	else
		result=(int)strtol(str, &error_pos, 0);

	while(char c=*error_pos++)
		if(!isspace(c))
			throw Exception("number.format",
				this,
				"invalid number (int)");

	return result;
}

inline void uint2uchars(uint word, uchar *bytes) {
	bytes[0]=word&0xFF;
	bytes[1]=(word>>8)&0xFF;
	bytes[2]=(word>>16)&0xFF;
	bytes[3]=(word>>24)&0xFF;
}
inline uint uchars2uint(uchar *bytes) {
	return bytes[3]<<24
		| bytes[2]<<16
		| bytes[1]<<8
		| bytes[0];
}

static int serialize_body_piece(const char* s, char** cur) {
	size_t length=strlen(s);
	memcpy(*cur, s, length);  *cur+=length;
	return 0;
};
String::Cm String::serialize(size_t prolog_length) const {
	size_t buf_length=
		prolog_length
		+fragments.count()*(sizeof(Language)+sizeof(size_t))
		+length();
	String::Cm result(new(PointerFreeGC) char[buf_length], buf_length);

	// 1: prolog
	char *cur=result.str+prolog_length;


	// 2: fragments.count
	size_t fragments_count=fragments.count();
	memcpy(cur, &fragments_count, sizeof(fragments_count));  cur+=sizeof(fragments_count);

	// 3: lang info
	for(Array_iterator<ArrayFragment::element_type> i(fragments); i.has_next(); ) {
		const Fragment fragment=i.next();
		// lang
		memcpy(cur, &fragment.lang, sizeof(fragment.lang));  cur+=sizeof(fragment.lang);
		// length
		memcpy(cur, &fragment.length, sizeof(fragment.length));  cur+=sizeof(fragment.length);
	}

	// 4: letters
	body.for_each(serialize_body_piece, &cur);

	return result;
}
bool String::deserialize(size_t prolog_length, void *buf, size_t buf_length) {
	if(buf_length<=prolog_length)
		return false;
	buf_length-=prolog_length;

	// 1: prolog
	const char* cur=(const char* )buf+prolog_length;

	// 2: fragments.count
	if(buf_length<sizeof(size_t)) // fragments.count don't fit?
		return false;
	size_t fragments_count=*reinterpret_cast<const size_t*>(cur);  cur+=sizeof(size_t);
	buf_length-=sizeof(size_t);
	
	if(fragments_count) {
		// 3: lang info
		size_t total_length=0;
		for(size_t f=0; f<fragments_count; f++) {
			size_t piece_length=sizeof(Language)+sizeof(size_t);
			if(buf_length<piece_length) // lang+length
				return false;

			Language lang=*reinterpret_cast<const Language *>(cur);  cur+=sizeof(Language);
			size_t fragment_length=*reinterpret_cast<const size_t*>(cur);  cur+=sizeof(size_t);
			fragments+=Fragment(lang, fragment_length);
			total_length+=fragment_length;

			buf_length-=piece_length;
		}

		// 4: letters
		if(buf_length!=total_length)
			return false;

		body=StringBody(cur, buf_length);
	}

	ASSERT_STRING_INVARIANT(*this);
	return true;
}