annotate src/prim.sml @ 220:2b665e822e9a

SQL boolean operators
author Adam Chlipala <adamc@hcoop.net>
date Sat, 16 Aug 2008 17:35:28 -0400
parents c0ea24dcb86f
children ed4af33681d8
rev   line source
adamc@14 1 (* Copyright (c) 2008, Adam Chlipala
adamc@14 2 * All rights reserved.
adamc@14 3 *
adamc@14 4 * Redistribution and use in source and binary forms, with or without
adamc@14 5 * modification, are permitted provided that the following conditions are met:
adamc@14 6 *
adamc@14 7 * - Redistributions of source code must retain the above copyright notice,
adamc@14 8 * this list of conditions and the following disclaimer.
adamc@14 9 * - Redistributions in binary form must reproduce the above copyright notice,
adamc@14 10 * this list of conditions and the following disclaimer in the documentation
adamc@14 11 * and/or other materials provided with the distribution.
adamc@14 12 * - The names of contributors may not be used to endorse or promote products
adamc@14 13 * derived from this software without specific prior written permission.
adamc@14 14 *
adamc@14 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
adamc@14 16 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
adamc@14 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
adamc@14 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
adamc@14 19 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
adamc@14 20 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
adamc@14 21 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
adamc@14 22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
adamc@14 23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
adamc@14 24 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
adamc@14 25 * POSSIBILITY OF SUCH DAMAGE.
adamc@14 26 *)
adamc@14 27
adamc@14 28 structure Prim :> PRIM = struct
adamc@14 29
adamc@14 30 datatype t =
adamc@14 31 Int of Int64.int
adamc@14 32 | Float of Real64.real
adamc@14 33 | String of string
adamc@14 34
adamc@14 35 open Print.PD
adamc@14 36 open Print
adamc@14 37
adamc@14 38 fun p_t t =
adamc@14 39 case t of
adamc@14 40 Int n => string (Int64.toString n)
adamc@14 41 | Float n => string (Real64.toString n)
adamc@95 42 | String s => box [string "\"", string (String.toString s), string "\""]
adamc@14 43
adamc@183 44 fun equal x =
adamc@183 45 case x of
adamc@183 46 (Int n1, Int n2) => n1 = n2
adamc@183 47 | (Float n1, Float n2) => Real64.== (n1, n2)
adamc@183 48 | (String s1, String s2) => s1 = s2
adamc@183 49
adamc@183 50 | _ => false
adamc@183 51
adamc@14 52 end