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package submit;
import parser.CminusBaseVisitor;
import parser.CminusParser;
import submit.ast.*;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Logger;
import java.util.stream.Collectors;
public class ASTVisitor extends CminusBaseVisitor<Node> {
private final Logger LOGGER;
private SymbolTable symbolTable;
public ASTVisitor(Logger LOGGER) {
this.LOGGER = LOGGER;
}
private VarType getVarType(CminusParser.TypeSpecifierContext ctx) {
final String t = ctx.getText();
return (t.equals("int")) ? VarType.INT : (t.equals("bool")) ? VarType.BOOL : VarType.CHAR;
}
@Override
public Node visitProgram(CminusParser.ProgramContext ctx) {
symbolTable = new SymbolTable();
List<Declaration> decls = new ArrayList<>();
for (CminusParser.DeclarationContext d : ctx.declaration())
decls.add((Declaration) visitDeclaration(d));
return new Program(decls);
}
@Override
public Node visitVarDeclaration(CminusParser.VarDeclarationContext ctx) {
VarType type = getVarType(ctx.typeSpecifier());
List<String> ids = new ArrayList<>();
List<Integer> arraySizes = new ArrayList<>();
for (CminusParser.VarDeclIdContext v : ctx.varDeclId()) {
String id = v.ID().getText();
ids.add(id);
symbolTable.addSymbol(id, new SymbolInfo(id, type, false));
if (v.NUMCONST() != null)
arraySizes.add(Integer.parseInt(v.NUMCONST().getText()));
else
arraySizes.add(-1);
}
final boolean isStatic = false;
return new VarDeclaration(type, ids, arraySizes, isStatic);
}
@Override
public Node visitReturnStmt(CminusParser.ReturnStmtContext ctx) {
if (ctx.expression() != null)
return new Return((Expression) visitExpression(ctx.expression()));
return new Return(null);
}
@Override
public Node visitConstant(CminusParser.ConstantContext ctx) {
final Node node;
if (ctx.NUMCONST() != null)
node = new NumConstant(Integer.parseInt(ctx.NUMCONST().getText()));
else if (ctx.CHARCONST() != null)
node = new CharConstant(ctx.CHARCONST().getText().charAt(0));
else if (ctx.STRINGCONST() != null)
node = new StringConstant(ctx.STRINGCONST().getText());
else
node = new BoolConstant(ctx.getText().equals("true"));
return node;
}
@Override
public Node visitFunDeclaration(CminusParser.FunDeclarationContext ctx) {
VarType rType = VarType.VOID;
if (ctx.typeSpecifier() != null)
rType = VarType.fromString(ctx.typeSpecifier().getText());
String id = ctx.ID().getText();
symbolTable.addSymbol(id, new SymbolInfo(id, rType, true));
symbolTable = symbolTable.createChild();
List<Param> params = ctx.param().stream().map(pCtx -> (Param) visitParam(pCtx)).collect(Collectors.toList());
Statement statement = (Statement) visitStatement(ctx.statement());
symbolTable = symbolTable.getParent();
return new FunctionDeclaration(rType, id, params, statement);
}
@Override
public Node visitParam(CminusParser.ParamContext ctx) {
VarType pType = getVarType(ctx.typeSpecifier());
String pId = ctx.paramId().getText();
Boolean isArray = pId.endsWith("[]");
if (isArray)
pId = pId.substring(0, pId.length() - 2);
symbolTable.addSymbol(pId, new SymbolInfo(pId, pType, false));
return new Param(pType, pId, isArray);
}
@Override
public Node visitStatement(CminusParser.StatementContext ctx) {
if (ctx.expressionStmt() != null)
return new ExpressionStatement((Expression) visitExpression(ctx.expressionStmt().expression()));
if (ctx.compoundStmt() != null) {
CminusParser.CompoundStmtContext cCtx = ctx.compoundStmt();
symbolTable = symbolTable.createChild();
List<VarDeclaration> varDecls = cCtx.varDeclaration().stream()
.map(declCtx -> (VarDeclaration) visitVarDeclaration(declCtx)).collect(Collectors.toList());
List<Statement> statements = cCtx.statement().stream().map(stmtCtx -> (Statement) visitStatement(stmtCtx))
.collect(Collectors.toList());
symbolTable = symbolTable.getParent();
return new CompoundStatement(varDecls, statements);
}
if (ctx.ifStmt() != null) {
List<Statement> statements = ctx.ifStmt().statement().stream()
.map(stmtCtx -> (Statement) visitStatement(stmtCtx)).collect(Collectors.toList());
return new IfStatement((Expression) visitSimpleExpression(ctx.ifStmt().simpleExpression()), statements);
}
if (ctx.whileStmt() != null)
return new WhileStatement((Expression) visitSimpleExpression(ctx.whileStmt().simpleExpression()),
(Statement) visitStatement(ctx.whileStmt().statement()));
if (ctx.returnStmt() != null) {
if (ctx.returnStmt().expression() != null)
return new Return((Expression) visitExpression(ctx.returnStmt().expression()));
return new Return(null);
}
if (ctx.breakStmt() != null)
return new Break();
return null;
}
@Override
public Node visitExpression(CminusParser.ExpressionContext ctx) {
if (ctx.mutable() != null && ctx.expression() != null)
return new ExpressionExpression((Mutable) visitMutable(ctx.mutable()),
(Expression) visitExpression(ctx.expression()), ctx.getChild(1).getText());
else if (ctx.mutable() != null)
return new ExpressionExpression((Mutable) visitMutable(ctx.mutable()), ctx.getChild(1).getText());
return visitSimpleExpression(ctx.simpleExpression());
}
@Override
public Node visitMutable(CminusParser.MutableContext ctx) {
String id = ctx.ID().getText();
if (symbolTable.find(id) == null)
LOGGER.warning("Undefined symbol on line " + ctx.getStart().getLine() + ": " + id);
return new Mutable(id,
ctx.expression() != null ? (Expression) visitExpression(ctx.expression()) : null);
}
@Override
public Node visitOrExpression(CminusParser.OrExpressionContext ctx) {
List<AndExpression> andExpressions = ctx.andExpression().stream().map(andExpression -> {
List<UnaryRelExpression> uRE = andExpression.unaryRelExpression().stream()
.map(unaryRelExpressionCtx -> (UnaryRelExpression) visitUnaryRelExpression(unaryRelExpressionCtx))
.collect(Collectors.toList());
return new AndExpression(uRE);
}).collect(Collectors.toList());
return new OrExpression(andExpressions);
}
@Override
public Node visitUnaryRelExpression(CminusParser.UnaryRelExpressionContext ctx) {
int bangs = ctx.BANG().size();
RelExpression relExpression = (RelExpression) visitRelExpression(ctx.relExpression());
return new UnaryRelExpression(bangs, relExpression);
}
@Override
public Node visitRelExpression(CminusParser.RelExpressionContext ctx) {
List<BinaryOperatorType> relOps = ctx.relop().stream()
.map(operatorContext -> BinaryOperatorType.fromString(operatorContext.getText()))
.collect(Collectors.toList());
List<SumExpression> sumExpressions = ctx.sumExpression().stream().map(sumExpressionCtx -> {
List<BinaryOperatorType> sumOps = sumExpressionCtx.sumop().stream()
.map(operatorContext -> BinaryOperatorType.fromString(operatorContext.getText()))
.collect(Collectors.toList());
List<TermExpression> termExprs = sumExpressionCtx.termExpression().stream()
.map(termExprCtx -> (TermExpression) visitTermExpression(termExprCtx)).collect(Collectors.toList());
return new SumExpression(sumOps, termExprs);
}).collect(Collectors.toList());
return new RelExpression(sumExpressions, relOps);
}
public Node visitTermExpression(CminusParser.TermExpressionContext ctx) {
List<BinaryOperatorType> mulOps = ctx.mulop().stream()
.map(operatorContext -> BinaryOperatorType.fromString(operatorContext.getText()))
.collect(Collectors.toList());
List<UnaryExpression> unaryExpressions = ctx.unaryExpression().stream().map(unaryExpressionCtx -> {
List<String> unaryOps = unaryExpressionCtx.unaryop().stream()
.map(operatorContext -> operatorContext.getText())
.collect(Collectors.toList());
Factor factor = (Factor) visitFactor(unaryExpressionCtx.factor());
return new UnaryExpression(unaryOps, factor);
}).collect(Collectors.toList());
return new TermExpression(unaryExpressions, mulOps);
}
public Node visitFactor(CminusParser.FactorContext ctx) {
if (ctx.immutable() != null)
return new Factor((Immutable) visitImmutable(ctx.immutable()));
return new Factor((Mutable) visitMutable(ctx.mutable()));
}
public Node visitImmutable(CminusParser.ImmutableContext ctx) {
if (ctx.constant() != null)
return new Immutable((Constant) visitConstant(ctx.constant()));
if (ctx.call() != null)
return new Immutable((Call) visitCall(ctx.call()), true);
return new Immutable((Expression) visitExpression(ctx.expression()));
}
public Node visitCall(CminusParser.CallContext ctx) {
String id = ctx.ID().getText();
if (symbolTable.find(id) == null)
LOGGER.warning("Undefined symbol on line " + ctx.getStart().getLine() + ": " + id);
return new Call(id, ctx.expression().stream()
.map(exprCtx -> (Expression) visitExpression(exprCtx)).collect(Collectors.toList()));
}
}
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