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// Copyright 2022 Google LLC
//
// 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.
grammar Commands;
import CEL;
// parser rules:
startCommand: command EOF;
command: help |
let |
declare |
delete |
simple |
compile |
exprCmd |
empty;
help: '%help' | '%?';
let: '%let' ( (var=varDecl '=') | (fn=fnDecl '->') ) e=expr;
declare: '%declare' (var=varDecl | fn=fnDecl);
varDecl: id=qualId (':' t=type)?;
fnDecl: id=qualId '(' (params+=param (',' params+=param)*)? ')' ':' rType=type;
param: pid=IDENTIFIER ':' t=type;
delete: '%delete' (var=varDecl | fn=fnDecl);
simple: cmd=COMMAND (args+=FLAG | args+=STRING)*;
empty: ;
compile: '%compile' e=expr;
exprCmd: '%eval'? e=expr;
qualId: leadingDot='.'? rid=IDENTIFIER ('.' qualifiers+=IDENTIFIER)*;
// type sublanguage
startType : t=type EOF;
type :
id=typeId params=typeParamList? ;
typeId :
leadingDot='.'? id=(IDENTIFIER|NUL) ('.' qualifiers+=IDENTIFIER )* ;
typeParamList:
'(' types+=type (',' types+=type)* ')' ;
// lexer rules:
COMMAND: '%' IDENTIFIER;
FLAG: '-'? '-' IDENTIFIER;
ARROW: '->';
EQUAL_ASSIGN: '=';
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