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hashfile.C

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

      Copyright (c) 2001-2005 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 1.44 2008-05-19 08:56:59 misha 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, HashStringValue&) { return new VHashfile(apool); }

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

// global variable

DECLARE_CLASS_VAR(hashfile, new MHashfile, 0);

// externs

extern String cycle_data_name;

// defines for statics

#define OPEN_DATA_NAME "HASHFILE-OPEN-DATA"

// methods

typedef Hash<const String::Body, bool> HashStringBool;

static void _open(Request& r, MethodParams& params) {
      HashStringBool* file_list=static_cast<HashStringBool*>(r.classes_conf.get(OPEN_DATA_NAME));
      if(!file_list) {
            file_list=new HashStringBool();
            r.classes_conf.put(OPEN_DATA_NAME, file_list);
      }

      const String& file_spec=r.absolute(params.as_string(0, FILE_NAME_MUST_BE_STRING));
      if(file_list->get(file_spec))
            throw Exception(PARSER_RUNTIME,
                  0,
                  "this hashfile is already opened, use existing variable");
      file_list->put(file_spec, true);

      VHashfile& self=GET_SELF(r, VHashfile);
      self.open(file_spec);
}

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.delete_files();
}

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

      StringOrValue sv_processed=info.r->process(*info.body_code);
      Request::Skip lskip=info.r->get_skip(); info.r->set_skip(Request::SKIP_NOTHING);

      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));
            else
                  info.need_delim=true;
      }

      info.r->write_pass_lang(sv_processed);

      return lskip==Request::SKIP_BREAK;
}
static void _foreach(Request& r, MethodParams& params) {
      Temp_hash_value<const String::Body, void*> 
            cycle_data_setter(r.classes_conf, cycle_data_name, /*any not null flag*/&r);

      const String& key_var_name=params.as_string(0, "key-var name must be string");
      const String& value_var_name=params.as_string(1, "value-var name must be string");

      Foreach_info info={
            &r,
            key_var_name.is_empty()? 0 : &key_var_name,
            value_var_name.is_empty()? 0 : &value_var_name,
            &params.as_junction(2, "body must be code"),
            /*delimiter*/params.count()>3 ? params.get(3) : 0,
            /*var_context*/r.get_method_frame()->caller(),
            /*vkey=*/new VString,
            /*vvalue=*/new VString,
            false
      };

      VHashfile& self=GET_SELF(r, VHashfile);
      self.for_each(one_foreach_cycle, &info);
}

static bool one_cleanup_cycle(const String::Body, const String&, void*) {
      return false;
}
static void _cleanup(Request& r, MethodParams&) {
      VHashfile& self=GET_SELF(r, VHashfile);

      self.for_each(one_cleanup_cycle, 0);
}

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

// constructor

MHashfile::MHashfile(): Methoded("hashfile") {
      // ^hashfile::open[filename]
      add_native_method("open", Method::CT_DYNAMIC, _open, 1, 1);
      // ^hashfile.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[] -- for backward compatibility. use .delete[] instead.
      add_native_method("clear", Method::CT_DYNAMIC, _clear, 0, 0);
      // ^hashfile.release[]
      add_native_method("release", Method::CT_DYNAMIC, _release, 0, 0);
      // ^hashfile.cleanup[]
      add_native_method("cleanup", Method::CT_DYNAMIC, _cleanup, 0, 0);
      add_native_method("defecate", Method::CT_DYNAMIC, _cleanup, 0, 0);
      // ^hashfile.foreach[key;value]{code}[delim]
      add_native_method("foreach", Method::CT_DYNAMIC, _foreach, 2+1, 2+1+1);
}

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