/*********************                                                        */
/** parser_state.cpp
 ** Original author: cconway
 ** Major contributors: dejan, mdeters
 ** Minor contributors (to current version): none
 ** This file is part of the CVC4 prototype.
 ** Copyright (c) 2009, 2010  The Analysis of Computer Systems Group (ACSys)
 ** Courant Institute of Mathematical Sciences
 ** New York University
 ** See the file COPYING in the top-level source directory for licensing
 ** information.
 **
 ** Parser state implementation.
 **/

#include <iostream>
#include <fstream>
#include <stdint.h>

#include "input.h"
#include "expr/command.h"
#include "expr/expr.h"
#include "expr/kind.h"
#include "expr/type.h"
#include "util/output.h"
#include "util/Assert.h"
#include "parser/parser_exception.h"
#include "parser/symbol_table.h"
#include "parser/cvc/cvc_input.h"
#include "parser/smt/smt_input.h"

using namespace std;
using namespace CVC4::kind;

namespace CVC4 {
namespace parser {

ParserState::ParserState(ExprManager* exprManager, const std::string& filename, Input* input) :
  d_exprManager(exprManager),
  d_input(input),
  d_filename(filename),
  d_done(false),
  d_checksEnabled(true) {
}

Expr ParserState::getSymbol(const std::string& name, SymbolType type) {
  Assert( isDeclared(name, type) );


  switch( type ) {

  case SYM_VARIABLE: // Functions share var namespace
    return d_varTable.getObject(name);

  default:
    Unhandled(type);
  }
}


Expr ParserState::getVariable(const std::string& name) {
  return getSymbol(name, SYM_VARIABLE);
}

Type*
ParserState::getType(const std::string& var_name,
                     SymbolType type) {
  Assert( isDeclared(var_name, type) );
  Type* t = getSymbol(var_name,type).getType();
  return t;
}

Type* ParserState::getSort(const std::string& name) {
  Assert( isDeclared(name, SYM_SORT) );
  Type* t = d_sortTable.getObject(name);
  return t;
}

/* Returns true if name is bound to a boolean variable. */
bool ParserState::isBoolean(const std::string& name) {
  return isDeclared(name, SYM_VARIABLE) && getType(name)->isBoolean();
}

/* Returns true if name is bound to a function. */
bool ParserState::isFunction(const std::string& name) {
  return isDeclared(name, SYM_VARIABLE) && getType(name)->isFunction();
}

/* Returns true if name is bound to a function returning boolean. */
bool ParserState::isPredicate(const std::string& name) {
  return isDeclared(name, SYM_VARIABLE) && getType(name)->isPredicate();
}

Expr 
ParserState::mkVar(const std::string& name, Type* type) {
  Debug("parser") << "mkVar(" << name << "," << *type << ")" << std::endl;
  Expr expr = d_exprManager->mkVar(name, type);
  defineVar(name,expr);
  return expr;
}

const std::vector<Expr>
ParserState::mkVars(const std::vector<std::string> names,
                    Type* type) {
  std::vector<Expr> vars;
  for(unsigned i = 0; i < names.size(); ++i) {
    vars.push_back(mkVar(names[i],type));
  }
  return vars;
}

void
ParserState::defineVar(const std::string& name, const Expr& val) {
  Assert(!isDeclared(name));
  d_varTable.bindName(name,val);
  Assert(isDeclared(name));
}

void
ParserState::undefineVar(const std::string& name) {
  Assert(isDeclared(name));
  d_varTable.unbindName(name);
  Assert(!isDeclared(name));
}

void
ParserState::setLogic(const std::string& name) {
  if( name == "QF_UF" ) {
    mkSort("U");
  } else {
    Unhandled(name);
  }
}

Type*
ParserState::mkSort(const std::string& name) {
  Debug("parser") << "newSort(" << name << ")" << std::endl;
  Assert( !isDeclared(name, SYM_SORT) ) ;
  Type* type = d_exprManager->mkSort(name);
  d_sortTable.bindName(name, type);
  Assert( isDeclared(name, SYM_SORT) ) ;
  return type;
}

const std::vector<Type*>
ParserState::mkSorts(const std::vector<std::string>& names) {
  std::vector<Type*> types;
  for(unsigned i = 0; i < names.size(); ++i) {
    types.push_back(mkSort(names[i]));
  }
  return types;
}

bool ParserState::isDeclared(const std::string& name, SymbolType type) {
  switch(type) {
  case SYM_VARIABLE:
    return d_varTable.isBound(name);
  case SYM_SORT:
    return d_sortTable.isBound(name);
  default:
    Unhandled(type);
  }
}

void ParserState::checkDeclaration(const std::string& varName,
                                   DeclarationCheck check,
                                   SymbolType type)
    throw (ParserException) {
  if(!d_checksEnabled) {
    return;
  }

  switch(check) {
  case CHECK_DECLARED:
    if( !isDeclared(varName, type) ) {
      parseError("Symbol " + varName + " not declared");
    }
    break;

  case CHECK_UNDECLARED:
    if( isDeclared(varName, type) ) {
      parseError("Symbol " + varName + " previously declared");
    }
    break;

  case CHECK_NONE:
    break;

  default:
    Unhandled(check);
  }
}

void ParserState::checkFunction(const std::string& name)
  throw (ParserException) {
  if( d_checksEnabled && !isFunction(name) ) {
    parseError("Expecting function symbol, found '" + name + "'");
  }
}

void ParserState::checkArity(Kind kind, unsigned int numArgs)
  throw (ParserException) {
  if(!d_checksEnabled) {
    return;
  }

  unsigned int min = d_exprManager->minArity(kind);
  unsigned int max = d_exprManager->maxArity(kind);

  if( numArgs < min || numArgs > max ) {
    stringstream ss;
    ss << "Expecting ";
    if( numArgs < min ) {
      ss << "at least " << min << " ";
    } else {
      ss << "at most " << max << " ";
    }
    ss << "arguments for operator '" << kind << "', ";
    ss << "found " << numArgs;
    parseError(ss.str());
  }
}

void ParserState::enableChecks() {
  d_checksEnabled = true;
}

void ParserState::disableChecks() {
  d_checksEnabled = false;
}


}/* CVC4::parser namespace */
}/* CVC4 namespace */