adamc@14: (* Copyright (c) 2008, Adam Chlipala
adamc@14:  * All rights reserved.
adamc@14:  *
adamc@14:  * Redistribution and use in source and binary forms, with or without
adamc@14:  * modification, are permitted provided that the following conditions are met:
adamc@14:  *
adamc@14:  * - Redistributions of source code must retain the above copyright notice,
adamc@14:  *   this list of conditions and the following disclaimer.
adamc@14:  * - Redistributions in binary form must reproduce the above copyright notice,
adamc@14:  *   this list of conditions and the following disclaimer in the documentation
adamc@14:  *   and/or other materials provided with the distribution.
adamc@14:  * - The names of contributors may not be used to endorse or promote products
adamc@14:  *   derived from this software without specific prior written permission.
adamc@14:  *
adamc@14:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@14:  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@14:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@14:  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@14:  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
adamc@14:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@14:  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@14:  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@14:  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@14:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@14:  * POSSIBILITY OF SUCH DAMAGE.
adamc@14:  *)
adamc@14: 
adamc@14: structure Prim :> PRIM = struct
adamc@14: 
adamc@14: datatype t =
adamc@14:          Int of Int64.int
adamc@14:        | Float of Real64.real
adamc@14:        | String of string
adamc@14: 
adamc@14: open Print.PD
adamc@14: open Print
adamc@14: 
adamc@14: fun p_t t =
adamc@14:     case t of
adamc@14:         Int n => string (Int64.toString n)
adamc@14:       | Float n => string (Real64.toString n)
adamc@95:       | String s => box [string "\"", string (String.toString s), string "\""]
adamc@14: 
adamc@183: fun equal x =
adamc@183:     case x of
adamc@183:         (Int n1, Int n2) => n1 = n2
adamc@183:       | (Float n1, Float n2) => Real64.== (n1, n2)
adamc@183:       | (String s1, String s2) => s1 = s2
adamc@183: 
adamc@183:       | _ => false
adamc@183: 
adamc@14: end