Documentation

src/main/java/edu/kit/formal/proofscriptparser/ASTChanger.java

@@ -19,8 +19,8 @@ public class ASTChanger extends DefaultASTVisitor<ASTNode> {
     }
 
     @Override public AssignmentStatement visit(AssignmentStatement assign) {
-        assign.setRhs((Variable) assign.getRhs().accept(this));
-        assign.setLhs((Expression) assign.getLhs().accept(this));
+        assign.setRhs((Expression) assign.getRhs().accept(this));
+        assign.setLhs((Variable) assign.getLhs().accept(this));
         return assign;
     }
 

src/main/java/edu/kit/formal/proofscriptparser/PrettyPrinter.java

 package edu.kit.formal.proofscriptparser;
 
 import edu.kit.formal.proofscriptparser.ast.*;
+import lombok.Getter;
+import lombok.Setter;
 
 import java.util.Iterator;
 import java.util.Map;
 
 /**
+ * Pretty printer for ASTs.
+ *
  * @author Alexander Weigl
  * @version 1 (28.04.17)
  */
 public class PrettyPrinter extends DefaultASTVisitor<Void> {
-    private static final int MAX_WIDTH = 80;
+
+    @Getter
+    @Setter
+    private int maxWidth = 80;
+
+    @Getter
+    @Setter
     private boolean unicode = true;
+
     private final StringBuilder s = new StringBuilder();
     private int indentation = 0;
 
-    @Override public String toString() {
+    @Override
+    public String toString() {
         return s.toString();
     }
 
-    @Override public Void visit(ProofScript proofScript) {
+    @Override
+    public Void visit(ProofScript proofScript) {
         s.append("script");
         s.append(proofScript.getName());
         s.append(" (");
@@ -31,7 +44,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(Signature sig) {
+    @Override
+    public Void visit(Signature sig) {
         Iterator<Map.Entry<Variable, Type>> iter = sig.entrySet().iterator();
         while (iter.hasNext()) {
             Map.Entry<Variable, Type> next = iter.next();
@@ -43,7 +57,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(AssignmentStatement assign) {
+    @Override
+    public Void visit(AssignmentStatement assign) {
         assign.getRhs().accept(this);
         s.append(" := ");
         assign.getLhs().accept(this);
@@ -51,7 +66,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(BinaryExpression e) {
+    @Override
+    public Void visit(BinaryExpression e) {
         boolean left = e.getPrecedence() < e.getLeft().getPrecedence();
         boolean right = e.getPrecedence() < e.getRight().getPrecedence();
 
@@ -75,7 +91,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return super.visit(e);
     }
 
-    @Override public Void visit(MatchExpression match) {
+    @Override
+    public Void visit(MatchExpression match) {
         s.append("match ");
         String prefix = getWhitespacePrefix();
         if (match.getTerm() != null) {
@@ -84,10 +101,9 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
 
         if (!match.getSignature().isEmpty()) {
 
-            if (getCurrentLineLength() > MAX_WIDTH) {
+            if (getCurrentLineLength() > maxWidth) {
                 s.append("\n").append(prefix);
-            }
-            else {
+            } else {
                 s.append(" ");
             }
 
@@ -99,7 +115,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(CasesStatement casesStatement) {
+    @Override
+    public Void visit(CasesStatement casesStatement) {
         s.append("cases {");
         incrementIndent();
         nl();
@@ -130,7 +147,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         nl();
     }
 
-    @Override public Void visit(CaseStatement caseStatement) {
+    @Override
+    public Void visit(CaseStatement caseStatement) {
         s.append("case ");
         caseStatement.getGuard().accept(this);
         s.append(" {");
@@ -140,34 +158,40 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return super.visit(caseStatement);
     }
 
-    @Override public Void visit(CallStatement call) {
+    @Override
+    public Void visit(CallStatement call) {
         s.append(call.getCommand()).append(' ');
         call.getParameters().accept(this);
         s.append(";");
         return null;
     }
 
-    @Override public Void visit(TermLiteral termLiteral) {
+    @Override
+    public Void visit(TermLiteral termLiteral) {
         s.append(String.format("`%s`", termLiteral.getText()));
         return super.visit(termLiteral);
     }
 
-    @Override public Void visit(StringLiteral stringLiteral) {
+    @Override
+    public Void visit(StringLiteral stringLiteral) {
         s.append(String.format("\"%s\"", stringLiteral.getText()));
         return super.visit(stringLiteral);
     }
 
-    @Override public Void visit(Variable variable) {
+    @Override
+    public Void visit(Variable variable) {
         s.append(variable.getIdentifier());
         return super.visit(variable);
     }
 
-    @Override public Void visit(BooleanLiteral bool) {
+    @Override
+    public Void visit(BooleanLiteral bool) {
         s.append(bool.isValue());
         return super.visit(bool);
     }
 
-    @Override public Void visit(Statements statements) {
+    @Override
+    public Void visit(Statements statements) {
         if (statements.size() == 0)
             return null;
         incrementIndent();
@@ -179,12 +203,14 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return super.visit(statements);
     }
 
-    @Override public Void visit(IntegerLiteral integer) {
+    @Override
+    public Void visit(IntegerLiteral integer) {
         s.append(integer.getValue().toString());
         return null;
     }
 
-    @Override public Void visit(TheOnlyStatement theOnly) {
+    @Override
+    public Void visit(TheOnlyStatement theOnly) {
         s.append("theonly {");
         theOnly.getBody().accept(this);
         cl();
@@ -192,7 +218,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(ForeachStatement foreach) {
+    @Override
+    public Void visit(ForeachStatement foreach) {
         s.append("foreach {");
         foreach.getBody().accept(this);
         cl();
@@ -200,7 +227,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(RepeatStatement repeat) {
+    @Override
+    public Void visit(RepeatStatement repeat) {
         s.append("repeat");
         s.append("{");
         repeat.getBody().accept(this);
@@ -210,7 +238,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
 
     }
 
-    @Override public Void visit(Parameters parameters) {
+    @Override
+    public Void visit(Parameters parameters) {
         int nl = getLastNewline();
         String indention = getWhitespacePrefix();
         Iterator<Map.Entry<Variable, Expression>> iter = parameters.entrySet().iterator();
@@ -222,10 +251,9 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
             entry.getValue().accept(this);
             if (iter.hasNext()) {
                 int currentLineLength = getCurrentLineLength();
-                if (currentLineLength > MAX_WIDTH) {
+                if (currentLineLength > maxWidth) {
                     s.append("\n").append(indention);
-                }
-                else {
+                } else {
                     s.append(" ");
                 }
             }
@@ -233,7 +261,8 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
         return null;
     }
 
-    @Override public Void visit(UnaryExpression e) {
+    @Override
+    public Void visit(UnaryExpression e) {
         s.append(unicode ? e.getOperator().unicode() : e.getOperator().symbol());
         if (e.getPrecedence() < e.getExpression().getPrecedence())
             s.append("(");
@@ -277,22 +306,4 @@ public class PrettyPrinter extends DefaultASTVisitor<Void> {
 
     //endregion
 
-    /**
-     * Flag for indicating, that the unicode operation symbols should be used.
-     *
-     * @return
-     */
-    public boolean isUnicode() {
-        return unicode;
-    }
-
-    /**
-     * @param unicode
-     * @return
-     * @see #isUnicode()
-     */
-    public PrettyPrinter setUnicode(boolean unicode) {
-        this.unicode = unicode;
-        return this;
-    }
 }

src/main/java/edu/kit/formal/proofscriptparser/TransformAst.java

@@ -75,8 +75,8 @@ public class TransformAst implements ScriptLanguageVisitor<Object> {
     public Object visitAssignment(ScriptLanguageParser.AssignmentContext ctx) {
         AssignmentStatement assign = new AssignmentStatement();
         assign.setRuleContext(ctx);
-        assign.setRhs(new Variable(ctx.variable));
-        assign.setLhs((Expression) ctx.expression().accept(this));
+        assign.setLhs(new Variable(ctx.variable));
+        assign.setRhs((Expression) ctx.expression().accept(this));
         return assign;
     }
 
@@ -159,7 +159,7 @@ public class TransformAst implements ScriptLanguageVisitor<Object> {
 
     @Override
     public Object visitExprLineOperators(ScriptLanguageParser.ExprLineOperatorsContext ctx) {
-        return createBinaryExpression(ctx, ctx.expression(), findOperator(ctx.op.getText()));
+            return createBinaryExpression(ctx, ctx.expression(), findOperator(ctx.op.getText()));
 
     }
 

src/main/java/edu/kit/formal/proofscriptparser/Visitable.java

 package edu.kit.formal.proofscriptparser;
 
 /**
+ * An interface for all classes that can be visited by {@link Visitor}.
+ *
  * @author Alexander Weigl
  * @version 1 (27.04.17)
  */

src/main/java/edu/kit/formal/proofscriptparser/ast/ASTNode.java

 package edu.kit.formal.proofscriptparser.ast;
 
+import com.sun.xml.internal.ws.wsdl.writer.document.OpenAtts;
 import edu.kit.formal.proofscriptparser.Visitable;
 import edu.kit.formal.proofscriptparser.Visitor;
+import lombok.Data;
 import org.antlr.v4.runtime.ParserRuleContext;
 
 import java.util.Optional;
@@ -10,19 +12,20 @@ import java.util.Optional;
  * @author Alexander Weigl
  * @version 1 (27.04.17)
  */
-public abstract class ASTNode<T extends ParserRuleContext> implements Visitable, Cloneable {
-    private Optional<T> ruleContext;
-    private Position startPosition = new Position();
-    private Position endPosition = new Position();
+public abstract class ASTNode<T extends ParserRuleContext>
+        implements Visitable, Cloneable {
+    protected T ruleContext;
+    protected Position startPosition = new Position();
+    protected Position endPosition = new Position();
 
     public void setRuleContext(T c) {
         startPosition = Position.from(c.getStart());
         endPosition = Position.from(c.getStop());
-        ruleContext = Optional.of(c);
+        ruleContext = c;
     }
 
     public Optional<T> getRuleContext() {
-        return ruleContext;
+        return Optional.of(ruleContext);
     }
 
     public Position getStartPosition() {
@@ -47,6 +50,12 @@ public abstract class ASTNode<T extends ParserRuleContext> implements Visitable,
      */
     public abstract <T> T accept(Visitor<T> visitor);
 
-    @Override public abstract ASTNode<T> clone();
+    /**
+     * Deep copy of the AST hierarchy.
+     *
+     * @return a fresh substree of the AST that is equal to this.
+     */
+    @Override
+    public abstract ASTNode<T> clone();
 
 }

src/main/java/edu/kit/formal/proofscriptparser/ast/AssignmentStatement.java

@@ -5,38 +5,41 @@ import edu.kit.formal.proofscriptparser.Visitor;
 import lombok.*;
 
 /**
+ * An {@link AssignmentStatement} encapsulate the assigned variable
+ * {@link AssignmentStatement#getLhs()} and an expression {@link AssignmentStatement#getRhs()}.
+ *
  * @author Alexander Weigl
  * @version 1 (28.04.17)
  */
-@Data @ToString(includeFieldNames = true) @NoArgsConstructor @RequiredArgsConstructor() @AllArgsConstructor
+@Data
+@ToString(includeFieldNames = true)
+@NoArgsConstructor
+@RequiredArgsConstructor()
+@AllArgsConstructor
 public class AssignmentStatement
         extends Statement<ScriptLanguageParser.AssignmentContext> {
-    @NonNull private Variable rhs;
-    @NonNull private Expression lhs;
+    @NonNull
+    private Variable lhs;
+    @NonNull
+    private Expression rhs;
+
     private Type type;
 
-    @Override public <T> T accept(Visitor<T> visitor) {
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
         return visitor.visit(this);
     }
 
-    @Override public AssignmentStatement clone() {
-        return new AssignmentStatement(rhs.clone(), lhs.clone());
-    }
-
-    public void setRhs(Variable rhs) {
-        this.rhs = rhs;
-    }
-
-    public Variable getRhs() {
-        return rhs;
-    }
-
-    public void setLhs(Expression lhs) {
-        this.lhs = lhs;
+    @Override
+    public AssignmentStatement clone() {
+        return new AssignmentStatement(lhs.clone(), rhs.clone(), type);
     }
 
-    public Expression getLhs() {
-        return lhs;
+    /**
+     * Returns true, iff this assignment declares the assigned variable.
+     */
+    public boolean isDeclaration() {
+        return type != null;
     }
 
 }

src/main/java/edu/kit/formal/proofscriptparser/ast/BinaryExpression.java

@@ -28,13 +28,18 @@ public class BinaryExpression extends Expression<ParserRuleContext> {
         return visitor.visit(this);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public BinaryExpression clone() {
         BinaryExpression be = new BinaryExpression(left.clone(), operator, right.clone());
         return be;
     }
 
-
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public Type getType(Signature signature) throws NotWelldefinedException {
         if (operator.arity() != 2)
@@ -46,6 +51,9 @@ public class BinaryExpression extends Expression<ParserRuleContext> {
         return operator.returnType();
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public int getPrecedence() {
         return operator.precedence();

src/main/java/edu/kit/formal/proofscriptparser/ast/BooleanLiteral.java

@@ -8,6 +8,10 @@ import org.antlr.v4.runtime.Token;
 import java.util.Optional;
 
 /**
+ * Represents a boolean literal (ie. {@link #FALSE} or {@link #TRUE}).
+ * <p>
+ * Instantiating can be useful for setting a custom {@link #setToken(Token)} and position.
+ *
  * @author Alexander Weigl
  * @version 1 (28.04.17)
  */
@@ -22,27 +26,32 @@ public class BooleanLiteral extends Literal {
 
     public BooleanLiteral(boolean value, Token token) {
         this.value = value;
-        if (token != null)
-            this.token = Optional.of(token);
-        else
-            this.token = Optional.empty();
-
+        this.token = token;
     }
 
     BooleanLiteral(boolean b) {
         this(b, null);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public <T> T accept(Visitor<T> visitor) {
         return visitor.visit(this);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public BooleanLiteral clone() {
-        return new BooleanLiteral(value, token.orElse(null));
+        return new BooleanLiteral(value, token);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override
     public Type getType(Signature signature) throws NotWelldefinedException {
         return Type.BOOL;

src/main/java/edu/kit/formal/proofscriptparser/ast/CallStatement.java

@@ -5,6 +5,8 @@ import edu.kit.formal.proofscriptparser.Visitor;
 import lombok.*;
 
 /**
+ * A call to a subroutine or atomic function.
+ *
  * @author Alexander Weigl
  * @version 1 (28.04.17)
  */
@@ -13,14 +15,30 @@ import lombok.*;
 @RequiredArgsConstructor
 @AllArgsConstructor
 public class CallStatement extends Statement<ScriptLanguageParser.ScriptCommandContext> {
-    @NonNull private String command;
+    /**
+     * The name of the command.
+     */
+    @NonNull
+    private String command;
+
+    /**
+     * The list of parameters.
+     */
     private Parameters parameters = new Parameters();
 
-    @Override public <T> T accept(Visitor<T> visitor) {
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public <T> T accept(Visitor<T> visitor) {
         return visitor.visit(this);
     }
 
-    @Override public CallStatement clone() {
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public CallStatement clone() {
         return new CallStatement(command, parameters.clone());
     }
 }

src/main/java/edu/kit/formal/proofscriptparser/ast/CaseStatement.java

@@ -2,6 +2,7 @@ package edu.kit.formal.proofscriptparser.ast;
 
 import edu.kit.formal.proofscriptparser.ScriptLanguageParser;
 import edu.kit.formal.proofscriptparser.Visitor;
+import lombok.AllArgsConstructor;
 import lombok.Data;
 import lombok.NoArgsConstructor;
 
@@ -11,21 +12,21 @@ import lombok.NoArgsConstructor;
  */
 @Data
 @NoArgsConstructor
+@AllArgsConstructor
 public class CaseStatement extends Statement<ScriptLanguageParser.CasesListContext> {
     private Expression guard;
     private Statements body;
 
-
-    public CaseStatement(Expression guard, Statements body) {
-        this.guard = guard;
-        this.body = body;
-    }
-
-
+    /**
+     * {@inheritDoc}
+     */
     @Override public <T> T accept(Visitor<T> visitor) {
         return visitor.visit(this);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override public CaseStatement clone() {
         return new CaseStatement(guard.clone(), body.clone());
     }

src/main/java/edu/kit/formal/proofscriptparser/ast/CasesStatement.java

@@ -3,6 +3,7 @@ package edu.kit.formal.proofscriptparser.ast;
 import edu.kit.formal.proofscriptparser.ScriptLanguageParser;
 import edu.kit.formal.proofscriptparser.Visitor;
 import lombok.Data;
+import lombok.NonNull;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -13,26 +14,19 @@ import java.util.List;
  */
 @Data
 public class CasesStatement extends Statement<ScriptLanguageParser.CasesListContext> {
-    private List<CaseStatement> cases = new ArrayList<>();
-    private Statements defaultCase = new Statements();
-
-    public List<CaseStatement> getCases() {
-        return cases;
-    }
-
-    public Statements getDefaultCase() {
-        return defaultCase;
-    }
-
-    public CasesStatement setDefaultCase(Statements defaultCase) {
-        this.defaultCase = defaultCase;
-        return this;
-    }
+    @NonNull private final List<CaseStatement> cases = new ArrayList<>();
+    @NonNull private Statements defaultCase = new Statements();
 
+    /**
+     * {@inheritDoc}
+     */
     @Override public <T> T accept(Visitor<T> visitor) {
         return visitor.visit(this);
     }
 
+    /**
+     * {@inheritDoc}
+     */
     @Override public CasesStatement clone() {
         CasesStatement c = new CasesStatement();
         cases.forEach(caseStatement -> c.cases.add(caseStatement.clone()));

src/main/java/edu/kit/formal/proofscriptparser/ast/Expression.java

@@ -4,18 +4,39 @@ import edu.kit.formal.proofscriptparser.NotWelldefinedException;
 import org.antlr.v4.runtime.ParserRuleContext;
 
 /**
+ * Abstract representation of an expression.