-- Copyright 2020 United States Government as represented by the Administrator
-- of the National Aeronautics and Space Administration. All Rights Reserved.
--
-- Disclaimers
--
-- Licensed under the Apache License, Version 2.0 (the "License"); you may
-- not use this file except in compliance with the License. You may obtain a
-- copy of the License at
--
-- https://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-- WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-- License for the specific language governing permissions and limitations
-- under the License.
--
-- Simplified grammar of Lustre boolean expressions.
entrypoints BoolSpec;
-- Boolean Expressions
_ . BoolSpec ::= BoolSpec ";" ;
BoolSpecPar. BoolSpec ::= "(" BoolSpec ")" ;
BoolSpecConstI. BoolSpec ::= Integer ;
BoolSpecConstD. BoolSpec ::= Double ;
BoolSpecConstB. BoolSpec ::= BoolConst ;
BoolSpecSignal. BoolSpec ::= Ident ;
BoolSpecOp1Pre. BoolSpec ::= Op1Pre BoolSpec ;
BoolSpecOp2In. BoolSpec ::= BoolSpec Op2In BoolSpec ;
BoolSpecOp2Pre. BoolSpec ::= Op2Pre "(" BoolSpec "," BoolSpec ")" ;
BoolSpecOp2OT. BoolSpec ::= "OT" "(" NumExpr "," NumExpr "," BoolSpec ")" ;
BoolSpecOp2HT. BoolSpec ::= "HT" "(" NumExpr "," NumExpr "," BoolSpec ")" ;
BoolSpecOp2ST. BoolSpec ::= "ST" "(" NumExpr "," NumExpr "," BoolSpec "," BoolSpec ")" ;
-- Boolean Operators
Op1Once. Op1Pre ::= "O" ;
Op1Pre. Op1Pre ::= "pre" ;
Op1YtoPre. Op1Pre ::= "YtoPre" ;
Op1ZtoPre. Op1Pre ::= "ZtoPre" ;
Op1Hist. Op1Pre ::= "H" ;
Op1Y. Op1Pre ::= "Y" ;
Op1Not. Op1Pre ::= "not" ;
Op1Bang. Op1Pre ::= "!" ;
Op2And. Op2In ::= "and" ;
Op2Amp. Op2In ::= "&" ;
Op2Or. Op2In ::= "or" ;
Op2Impl. Op2In ::= "=>" ;
Op2NumOp . Op2In ::= NumOp2In ;
Op2NumCmp . Op2In ::= BoolNumOp ;
Op2InPre. Op2In ::= "->" ;
Op2SI. Op2Pre ::= "SI" ;
Op2OT. Op2Pre ::= "OT" ;
-- Numeric Expressions
NumExprNum. NumExpr ::= Integer ;
NumExprId. NumExpr ::= Ident ;
NumExprPar. NumExpr ::= "(" NumExpr ")" ;
NumExprOp2In. NumExpr ::= NumExpr NumOp2In NumExpr ;
-- Numeric Operators
NumOp2Plus. NumOp2In ::= "+" ;
NumOp2Minus. NumOp2In ::= "-" ;
NumOp2Mult . NumOp2In ::= "*" ;
BoolNumOp2Eq . BoolNumOp ::= "=" ;
BoolNumOp2Ne . BoolNumOp ::= "<>" ;
BoolNumOp2Le . BoolNumOp ::= "<=" ;
BoolNumOp2Lt . BoolNumOp ::= "<" ;
BoolNumOp2Gt . BoolNumOp ::= ">" ;
BoolNumOp2Ge . BoolNumOp ::= ">=" ;
-- Basic types
BoolConstTrue. BoolConst ::= "true" ;
BoolConstFalse. BoolConst ::= "false" ;
BoolConstFTP. BoolConst ::= "FTP" ;