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Microbe.g4
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Microbe.g4
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grammar Microbe;
@header {
import java.util.LinkedList;
import Nucleus.*;
import SymbolScope.*;
import AST.*;
}
@members {
public SymbolScopeTree sst = new SymbolScopeTree();
}
// implicitly instantiates SymbolScope.SymbolScopeTree: sst
program: PROGRAM id BEGIN pgm_body END ;
id: IDENTIFIER ;
pgm_body: decl func_declarations ;
decl: string_decl decl | var_decl decl | ;
/* Global String Declaration */
string_decl: STRING id ASSIGN str SEMICOLON
{
sst.currentScope.addString($id.text, $str.text);
};
str: STRINGLITERAL ;
/* Variable Declaration */
var_decl: var_type id_list SEMICOLON
{
sst.currentScope.addVariables($var_type.text, $id_list.ids);
};
var_type: FLOAT | INT ;
any_type: var_type | VOID ;
id_list returns [List<String> ids]: id id_tail
{
$ids = $id_tail.ids;
$ids.add(0, $id.text);
};
id_tail returns [List<String> ids]:
COMMA id
t = id_tail
{
$ids = $t.ids;
$ids.add(0, $id.text);
}
|
{
// base case
$ids = new LinkedList<String>();
}
;
/* Function Paramater List */
param_decl_list: param_decl param_decl_tail | ;
param_decl: var_type id
{
((FunctionScopeNode)sst.currentScope).addParameter($var_type.text, $id.text);
};
param_decl_tail: COMMA param_decl param_decl_tail | ;
/* Function Declarations */
func_declarations: func_decl func_declarations | ;
func_decl:
FUNCTION any_type id
{
sst.enterScope($any_type.text, $id.text);
}
OPAREN param_decl_list CPAREN
BEGIN
func_body
END
{
sst.exitScope();
}
;
func_body: decl stmt_list
{
sst.currentScope.statements = $stmt_list.stmts;
};
/* Complex Statements and Condition */
if_stmt returns [AstNode node]:
IF OPAREN cond CPAREN
{
sst.enterScope();
$node = new IfAstNode(sst.currentScope.name, $cond.node, null);
}
decl
stmt_list
{
sst.currentScope.statements = $stmt_list.stmts;
sst.exitScope();
}
else_part
ENDIF
{
((IfAstNode)$node).otherwise = $else_part.node;
}
;
else_part returns [IfAstNode node]:
ELSE
{
sst.enterScope();
$node = new IfAstNode(sst.currentScope.name, null, null);
}
decl
stmt_list
{
sst.currentScope.statements = $stmt_list.stmts;
sst.exitScope();
}
| ;
while_stmt returns [AstNode node]:
WHILE OPAREN cond CPAREN
{
sst.enterScope();
$node = new WhileAstNode(sst.currentScope.name, $cond.node);
}
decl
stmt_list
{
sst.currentScope.statements = $stmt_list.stmts;
}
ENDWHILE
{
sst.exitScope();
}
;
cond returns [AstNode node]: t1 = expr compop t2 = expr
{
AstNode left = $t1.node;
AstNode right = $t2.node;
$node = new ConditionOpAstNode($compop.optype, left, right);
};
compop returns [ConditionOpAstNode.OpType optype]:
GT
{
$optype = ConditionOpAstNode.OpType.GT;
}
|
LT
{
$optype = ConditionOpAstNode.OpType.LT;
}
|
EQUALS
{
$optype = ConditionOpAstNode.OpType.EQ;
}
|
NEQUALS
{
$optype = ConditionOpAstNode.OpType.NE;
}
|
GTE
{
$optype = ConditionOpAstNode.OpType.GE;
}
|
LTE
{
$optype = ConditionOpAstNode.OpType.LE;
}
;
/* Statement List */
stmt_list returns [List<AstNode> stmts]:
stmt t = stmt_list
{
$stmts = $t.stmts;
$stmts.add(0, $stmt.ast_root_node);
}
|
{
// base case
$stmts = new LinkedList<AstNode>();
}
;
stmt returns [AstNode ast_root_node]:
base_stmt
{
$ast_root_node = $base_stmt.node;
}
|
if_stmt
{
$ast_root_node = $if_stmt.node;
}
|
while_stmt
{
$ast_root_node = $while_stmt.node;
}
;
base_stmt returns [AstNode node]:
assign_stmt
{
$node = $assign_stmt.node;
}
|
read_stmt
{
$node = $read_stmt.node;
}
|
write_stmt
{
$node = $write_stmt.node;
}
|
return_stmt
{
$node = $return_stmt.node;
}
;
/* Basic Statements */
assign_stmt returns [AstNode node]:
assign_expr
{
$node = $assign_expr.node;
}
SEMICOLON ;
assign_expr returns [AstNode node]: id ASSIGN expr
{
AstNode left = new IdentifierAstNode($id.text);
AstNode right = $expr.node;
$node = new BinaryOpAstNode(BinaryOpAstNode.OpType.ASSIGN, left, right);
};
read_stmt returns [AstNode node]: READ OPAREN id_list CPAREN SEMICOLON
{
$node = new SystemOpAstNode(SystemOpAstNode.OpType.READ, $id_list.ids);
};
write_stmt returns [AstNode node]: WRITE OPAREN id_list CPAREN SEMICOLON
{
$node = new SystemOpAstNode(SystemOpAstNode.OpType.WRITE, $id_list.ids);
};
return_stmt returns [AstNode node]: RETURN expr SEMICOLON
{
$node = new CallAstNode(CallAstNode.OpType.RET, $expr.node);;
};
/* Expressions */
expr returns [AstNode node]: expr_prefix factor
{
if($expr_prefix.node != null) {
((BinaryOpAstNode)($expr_prefix.node)).right = $factor.node;
$node = $expr_prefix.node;
}
else {
$node = $factor.node;
}
};
expr_prefix returns [AstNode node]: t = expr_prefix factor addop
{
if($t.node != null) {
((BinaryOpAstNode)($t.node)).right = $factor.node;
$node = new BinaryOpAstNode($addop.optype, $t.node, null);
}
else {
$node = new BinaryOpAstNode($addop.optype, $factor.node, null);
}
}
| ;
factor returns [AstNode node]: factor_prefix postfix_expr
{
if($factor_prefix.node != null) {
((BinaryOpAstNode)($factor_prefix.node)).right = $postfix_expr.node;
$node = $factor_prefix.node;
}
else {
$node = $postfix_expr.node;
}
};
factor_prefix returns [AstNode node]: t = factor_prefix postfix_expr mulop
{
if($t.node != null) {
((BinaryOpAstNode)($t.node)).right = $postfix_expr.node;
$node = new BinaryOpAstNode($mulop.optype, $t.node, null);
}
else {
$node = new BinaryOpAstNode($mulop.optype, $postfix_expr.node, null);
}
}
| ;
postfix_expr returns [AstNode node]:
primary
{
$node = $primary.node;
}
|
call_expr
{
$node = $call_expr.node;
}
;
call_expr returns [AstNode node]: id OPAREN expr_list CPAREN
{
$node = new CallAstNode(CallAstNode.OpType.CALL, $id.text, $expr_list.nodes);
};
expr_list returns [LinkedList<AstNode> nodes]:
expr expr_list_tail
{
$nodes = $expr_list_tail.nodes;
$nodes.add(0, $expr.node);
}
|
{
$nodes = new LinkedList<AstNode>();
};
expr_list_tail returns [LinkedList<AstNode> nodes]:
COMMA expr t = expr_list_tail
{
$nodes = $t.nodes;
$nodes.add(0, $expr.node);
}
|
{
$nodes = new LinkedList<AstNode>();
};
primary returns [AstNode node]:
OPAREN expr CPAREN
{
$node = $expr.node;
}
|
id
{
$node = new IdentifierAstNode($id.text);
}
|
INTLITERAL
{
$node = new LiteralAstNode(Operand.DataType.INT, $INTLITERAL.text);
}
|
FLOATLITERAL
{
$node = new LiteralAstNode(Operand.DataType.FLOAT, $FLOATLITERAL.text);
}
;
addop returns [BinaryOpAstNode.OpType optype]:
ADD
{
$optype = BinaryOpAstNode.OpType.ADD;
}
|
MINUS
{
$optype = BinaryOpAstNode.OpType.MINUS;
}
;
mulop returns [BinaryOpAstNode.OpType optype]:
MULTIPLY
{
$optype = BinaryOpAstNode.OpType.MULTIPLY;
}
|
DIVIDE
{
$optype = BinaryOpAstNode.OpType.DIVIDE;
}
;
ASSIGN: ':=' ;
SEMICOLON: ';' ;
ADD: '+' ;
MINUS: '-' ;
MULTIPLY: '*' ;
DIVIDE: '/' ;
LT: '<' ;
GT: '>' ;
LTE: '<=' ;
GTE: '>=' ;
EQUALS: '=' ;
NEQUALS: '!=' ;
OPAREN: '(' ;
CPAREN: ')' ;
COMMA: ',' ;
PROGRAM: 'PROGRAM' ;
BEGIN: 'BEGIN' ;
END: 'END' ;
FUNCTION: 'FUNCTION' ;
RETURN: 'RETURN' ;
IF: 'IF' ;
ELSE: 'ELSE' ;
ENDIF: 'ENDIF' ;
WHILE: 'WHILE' ;
CONTINUE: 'CONTINUE' ;
BREAK: 'BREAK' ;
ENDWHILE: 'ENDWHILE' ;
READ: 'READ' ;
WRITE: 'WRITE' ;
VOID: 'VOID' ;
INT: 'INT' ;
FLOAT: 'FLOAT' ;
STRING: 'STRING' ;
FLOATLITERAL: DIGIT* '.' DIGIT+;
INTLITERAL: DIGIT+;
STRINGLITERAL: '"' (~["\r\n])*? '"';
IDENTIFIER: CHAR (DIGIT | CHAR)*;
COMMENT: '--' ~[\r\n]*? '\r'? '\n' -> channel(HIDDEN) ;
WHITES: [ \r\n\t]+ -> channel(HIDDEN) ;
fragment CHAR: [a-zA-Z];
fragment DIGIT: [0-9];