/** @file
	Parser: @b hashfile parser class.

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


static const char * const IDENT="$Id: hashfile.C,v 1.32 2003/11/20 16:34:23 paf Exp $";

#include "classes.h"

#include "pa_request.h"
#include "pa_vmethod_frame.h"
#include "pa_vhashfile.h"
#include "pa_vhash.h"

// class

class MHashfile : public Methoded {
public: // VStateless_class
	Value *create_new_value(Pool& apool) { return new VHashfile(apool); }

public:
	MHashfile();
public: // Methoded
	bool used_directly() { return true; }
};

// global variable

DECLARE_CLASS_VAR(hashfile, new MHashfile, 0);

// methods

static void _open(Request& r, MethodParams& params) {
	VHashfile& self=GET_SELF(r, VHashfile);
	
	self.open(r.absolute(params.as_string(0, "filename must be string")));
}

static void _hash(Request& r, MethodParams&) {
	VHashfile& self=GET_SELF(r, VHashfile);
	
	// write out result
	VHash& result=*new VHash(*self.get_hash());
	r.write_no_lang(result);
}

static void _delete(Request& r, MethodParams& params) {
	VHashfile& self=GET_SELF(r, VHashfile);
	
	if(!params.count()) {
		// ^hashfile.delete[] asked to delete hashfile itself
		self.delete_files();
		return;
	}
	// key
	const String &key=params.as_string(0, "key must be string");
	// remove
	self.remove(key);
}

static void _clear(Request& r, MethodParams&) {
	VHashfile& self=GET_SELF(r, VHashfile);
	self.clear();
}

#ifndef DOXYGEN
struct Foreach_info {
	Request* r;
	const String* key_var_name;
	const String* value_var_name;
	Value* body_code;
	Value* delim_maybe_code;

	Value* var_context;
	VString* vkey;
	VString* vvalue;
	bool need_delim;
};
#endif
static void one_foreach_cycle(const String::Body key, const String& value, void* ainfo) {
	Foreach_info& info=*static_cast<Foreach_info*>(ainfo);
	info.vkey->set_string(*new String(key, String::L_TAINTED));
	info.vvalue->set_string(value);
	info.var_context->put_element(*info.key_var_name, info.vkey, false);
	info.var_context->put_element(*info.value_var_name, info.vvalue, false);

	StringOrValue sv_processed=info.r->process(*info.body_code);
	const String* s_processed=sv_processed.get_string();
	if(info.delim_maybe_code && s_processed && s_processed->length()) { // delimiter set and we have body
		if(info.need_delim) // need delim & iteration produced string?
			info.r->write_pass_lang(info.r->process(*info.delim_maybe_code));
		info.need_delim=true;
	}
	info.r->write_pass_lang(sv_processed);
}
static void _foreach(Request& r, MethodParams& params) {
	VHashfile& self=GET_SELF(r, VHashfile);

	Foreach_info info;
	
	info.r=&r;
	info.key_var_name=&params.as_string(0, "key-var name must be string");
	info.value_var_name=&params.as_string(1, "value-var name must be string");
	info.body_code=&params.as_junction(2, "body must be code");
	info.delim_maybe_code=params.count()>3?params.get(3):0;

	info.var_context=info.body_code->get_junction()->wcontext;
	info.vkey=new VString;
	info.vvalue=new VString;

	info.need_delim=false;

	self.for_each(one_foreach_cycle, &info);
}

// constructor

MHashfile::MHashfile(): Methoded("hashfile") {
	// ^hashfile::open[db_home;filename]
	add_native_method("open", Method::CT_DYNAMIC, _open, 1, 1);
	// ^hash[]
	add_native_method("hash", Method::CT_DYNAMIC, _hash, 0, 0);
	// ^hashfile.delete[key]
	add_native_method("delete", Method::CT_DYNAMIC, _delete, 0, 1);
	// ^hashfile.clear[]
	add_native_method("clear", Method::CT_DYNAMIC, _clear, 0, 0);
	// ^hashfile.foreach[key;value]{code}[delim]
	add_native_method("foreach", Method::CT_DYNAMIC, _foreach, 2+1, 2+1+1);
}