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pascalscript_parser_v0.g4
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pascalscript_parser_v0.g4
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/*
This file is part of the PascalScript Pascal interpreter.
SPDX-FileCopyrightText: 2024 Christophe "CHiPs" Petit <chips44@gmail.com>
SPDX-License-Identifier: GPL-3.0-or-later
*/
/* ******************** PascalScript V0 ANTLR4 ******************** */
/*
npm i -g --save-dev antlr-format-cli
antlr-format -v pascalscript_parser_v0.g4
antlr4-parse pascalscript_parser_v0.g4 pascalscript_lexer_v0.g4 pascalFile -tokens -trace < examples/01-first.pas
antlr4 -o /tmp -long-messages -listener -visitor -Dlanguage=Cpp pascalscript_lexer_v0.g4 pascalscript_parser_v0.g4
*/
// $antlr-format alignTrailingComments true
// $antlr-format columnLimit 150
// $antlr-format minEmptyLines 1
// $antlr-format maxEmptyLinesToKeep 1
// $antlr-format reflowComments false
// $antlr-format useTab false
// $antlr-format allowShortRulesOnASingleLine true
// $antlr-format allowShortBlocksOnASingleLine true
// $antlr-format alignSemicolons ownLine
// $antlr-format alignColons hanging
parser grammar pascalscript_parser_v0;
options {
tokenVocab = pascalscript_lexer_v0;
// needs antlr4 >= 4.10
caseInsensitive = true;
}
/* ******************** PROGRAM ******************** */
pascalFile: pascalProgram;
pascalProgram: PROGRAM IDENTIFIER SEMI_COLON pascalHeader instructionBlock DOT EOF;
pascalHeader: pascalBlock*;
pascalBlock: constBlock | varBlock;
instructionBlock: BEGIN (instruction)* END;
instruction: assignment | procedureCall;
assignment: variableReference DOT_COLON expression SEMI_COLON;
procedureCall: (WRITE | WRITELN) (LEFT_PARENTHESIS parameterList RIGHT_PARENTHESIS)? SEMI_COLON;
parameterList: parameter (COMMA parameter)*;
parameter: expression | variableReference | constantReference;
/* ******************** CONSTANTS ******************** */
constBlock: CONST constantDeclaration+;
constantDeclaration: IDENTIFIER EQUAL expression SEMI_COLON;
/* ******************** VARIABLES ******************** */
varBlock: VAR variableDeclaration+;
variableDeclaration: identifierList COLON (REAL | INTEGER | CARDINAL) SEMI_COLON;
identifierList: IDENTIFIER (COMMA IDENTIFIER)*;
/* ******************** EXPRESSIONS ******************** */
expression
: unaryOperator expression
| expression multiplicativeOperator expression
| expression additiveOperator expression
| UNSIGNED_INTEGER_VALUE
| UNSIGNED_REAL_VALUE
| variableReference
| constantReference
| LEFT_PARENTHESIS expression RIGHT_PARENTHESIS
;
unaryOperator: PLUS | MINUS;
additiveOperator: PLUS | MINUS;
multiplicativeOperator: STAR | SLASH | DIV | MOD;
variableReference: IDENTIFIER;
constantReference: IDENTIFIER;
// EOF