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//! Basic types used by the library.

use std::io ;
use std::fmt ;

use errors::* ;


/// A symbol printable in the SMT Lib 2 standard given some info.
pub trait Sym2Smt<Info> {
  /// Prints a symbol to a writer given some info.
  fn sym_to_smt2<Writer>(& self, & mut Writer, Info) -> SmtRes<()>
  where Writer: io::Write ;
}

/// An expression printable in the SMT Lib 2 standard given some info.
pub trait Expr2Smt<Info> {
  /// Prints an expression to a writer given some info.
  fn expr_to_smt2<Writer>(& self, & mut Writer, Info) -> SmtRes<()>
  where Writer: io::Write ;
}

/// A sort printable in the SMT Lib 2 standard.
pub trait Sort2Smt {
  /// Prints a sort to a writer info.
  fn sort_to_smt2<Writer>(& self, & mut Writer) -> SmtRes<()>
  where Writer: io::Write ;
}

/// Writes a string.
#[inline(always)]
pub fn write_str(
  w: & mut io::Write, s: & str
) -> SmtRes<()> {
  w.write_all( s.as_bytes() ) ? ;
  Ok(())
}

impl<'a, T> Sym2Smt<T> for & 'a str {
  fn sym_to_smt2<Writer>(
    & self, writer: & mut Writer, _: T
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}
impl<'a, T> Expr2Smt<T> for & 'a str {
  fn expr_to_smt2<Writer>(
    & self, writer: & mut Writer, _: T
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}
impl<'a> Sort2Smt for & 'a str {
  fn sort_to_smt2<Writer>(
    & self, writer: & mut Writer
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}

impl<T> Sym2Smt<T> for str {
  fn sym_to_smt2<Writer>(
    & self, writer: & mut Writer, _: T
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}
impl<T> Expr2Smt<T> for str {
  fn expr_to_smt2<Writer>(
    & self, writer: & mut Writer, _: T
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}
impl Sort2Smt for str {
  fn sort_to_smt2<Writer>(
    & self, writer: & mut Writer
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}

impl<T> Sym2Smt<T> for String {
  fn sym_to_smt2<Writer>(
    & self, writer: & mut Writer, _: T
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}
impl<T> Expr2Smt<T> for String {
  fn expr_to_smt2<Writer>(
    & self, writer: & mut Writer, _: T
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}
impl Sort2Smt for String {
  fn sort_to_smt2<Writer>(
    & self, writer: & mut Writer
  ) -> SmtRes<()> where Writer: io::Write {
    write_str(writer, self)
  }
}




/// SMT Lib 2 logics.
#[allow(non_camel_case_types)]
#[derive(Clone, Copy)]
pub enum Logic {
  /// Quantifier-free uninterpreted functions.
  QF_UF,
  /// Quantifier-free linear integer arithmetic.
  QF_LIA,
  /// Quantifier-free non-linear integer arithmetic.
  QF_NIA,
  /// Quantifier-free linear real arithmetic.
  QF_LRA,
  /** Quantifier-free arrays, uninterpreted functions, linear integer
  arithmetic. */
  QF_AUFLIA,
  /** Quantifier-free arrays, uninterpreted functions, linear integer
  arithmetic. */
  AUFLIA,
  /// Arrays, uninterpreted functions, linear integer/real arithmetic.
  AUFLIRA,
  /// arrays, uninterpreted functions, non-linear integer/real arithmetic.
  AUFNIRA,
  /// Linear real arithmetic.
  LRA,
}
impl fmt::Display for Logic {
  fn fmt(& self, fmt: & mut fmt::Formatter) -> fmt::Result {
    use self::Logic::* ;
    match * self {
      QF_UF => write!(fmt, "QF_UF"),
      QF_LIA => write!(fmt, "QF_LIA"),
      QF_NIA => write!(fmt, "QF_NIA"),
      QF_LRA => write!(fmt, "QF_LRA"),
      QF_AUFLIA => write!(fmt, "QF_AUFLIA"),
      AUFLIA => write!(fmt, "AUFLIA"),
      AUFLIRA => write!(fmt, "AUFLIRA"),
      AUFNIRA => write!(fmt, "AUFNIRA"),
      LRA => write!(fmt, "LRA"),
    }
  }
}
impl Logic {
  /// Prints the logic in a writer in SMT Lib 2 format.
  pub fn to_smt2(& self, writer: & mut io::Write, _: ()) -> SmtRes<()> {
    write!(writer, "{}", self) ? ;
    Ok(())
  }
}

#[test]
fn logic() {
  use conf::SolverConf ;
  use { Logic, Kid, solver, Solver } ;

  let conf = SolverConf::z3() ;

  let mut kid = Kid::new(conf).expect("kid") ;

  let mut solver = solver(& mut kid, ()).expect("solver") ;

  solver.set_logic(Logic::QF_UF).expect("QF_UF") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::QF_LIA).expect("QF_LIA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::QF_NIA).expect("QF_NIA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::QF_LRA).expect("QF_LRA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::QF_AUFLIA).expect("QF_AUFLIA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::AUFLIA).expect("AUFLIA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::AUFLIRA).expect("AUFLIRA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::AUFNIRA).expect("AUFNIRA") ;
  solver.reset().expect("reset") ;
  solver.set_logic(Logic::LRA).expect("LRA") ;
  solver.reset().expect("reset") ;
}