Add toString() method to all classes in the AST.

examples/squares.tb

@@ -0,0 +1,5 @@
+10 LET X = 1
+20 PRINT X * X
+30 LET X = X + 1
+40 IF X > 10 THEN END
+50 GOTO 20

src/main/java/com/grahamedgecombe/tinybasic/TinyBasicCompiler.java

@@ -1,9 +1,25 @@
 package com.grahamedgecombe.tinybasic;
 
-public final class TinyBasicCompiler {
+import com.grahamedgecombe.tinybasic.ast.Program;
+import com.grahamedgecombe.tinybasic.parser.Parser;
+import com.grahamedgecombe.tinybasic.tokenizer.Tokenizer;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
 
-    public static void main(String[] args) {
+public final class TinyBasicCompiler {
 
+    public static void main(String[] args) throws IOException {
+        Path path = Paths.get(args[0]);
+        try (Tokenizer tokenizer = new Tokenizer(Files.newBufferedReader(path, StandardCharsets.UTF_8))) {
+            try (Parser parser = new Parser(tokenizer)) {
+                Program program = parser.parse();
+                System.out.println(program.toString().trim());
+            }
+        }
     }
 
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/BinaryExpression.java

@@ -44,4 +44,9 @@ public int hashCode() {
         return Objects.hash(operator, leftExpression, rightExpression);
     }
 
+    @Override
+    public String toString() {
+        return "(" + leftExpression + " " + operator + " " + rightExpression + ")";
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/BinaryOperator.java

@@ -1,5 +1,15 @@
 package com.grahamedgecombe.tinybasic.ast;
 
 public enum BinaryOperator {
-    PLUS, MINUS, MULT, DIV
+    PLUS('+'), MINUS('-'), MULT('*'), DIV('/');
+
+    private final char character;
+
+    private BinaryOperator(char character) {
+        this.character = character;
+    }
+
+    public String toString() {
+        return String.valueOf(character);
+    }
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/BranchStatement.java

@@ -38,4 +38,9 @@ public int hashCode() {
         return Objects.hash(type, target);
     }
 
+    @Override
+    public String toString() {
+        return type + " " + target;
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/EndStatement.java

@@ -15,4 +15,9 @@ public int hashCode() {
         return 0;
     }
 
+    @Override
+    public String toString() {
+        return "END";
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/IfStatement.java

@@ -51,4 +51,9 @@ public int hashCode() {
         return Objects.hash(operator, leftExpression, rightExpression, statement);
     }
 
+    @Override
+    public String toString() {
+        return "IF " + leftExpression + " " + operator + " " + rightExpression + " THEN " + statement;
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/ImmediateExpression.java

@@ -29,4 +29,9 @@ public int hashCode() {
         return value;
     }
 
+    @Override
+    public String toString() {
+        return Integer.toString(value);
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/ImmediateString.java

@@ -29,4 +29,9 @@ public int hashCode() {
         return value.hashCode();
     }
 
+    @Override
+    public String toString() {
+        return "\"" + value + "\"";
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/InputStatement.java

@@ -38,4 +38,15 @@ public int hashCode() {
         return names.hashCode();
     }
 
+    @Override
+    public String toString() {
+        StringBuilder buf = new StringBuilder("INPUT ");
+        for (int i = 0; i < names.size(); i++) {
+            buf.append(names.get(i));
+            if (i != (names.size() - 1))
+                buf.append(", ");
+        }
+        return buf.toString();
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/LetStatement.java

@@ -38,4 +38,9 @@ public int hashCode() {
         return Objects.hash(name, value);
     }
 
+    @Override
+    public String toString() {
+        return "LET " + name + " = " + value;
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/Line.java

@@ -38,4 +38,9 @@ public int hashCode() {
         return Objects.hash(number, statement);
     }
 
+    @Override
+    public String toString() {
+        return number + " " + statement;
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/PrintStatement.java

@@ -38,4 +38,15 @@ public int hashCode() {
         return values.hashCode();
     }
 
+    @Override
+    public String toString() {
+        StringBuilder buf = new StringBuilder("PRINT ");
+        for (int i = 0; i < values.size(); i++) {
+            buf.append(values.get(i));
+            if (i != (values.size() - 1))
+                buf.append(", ");
+        }
+        return buf.toString();
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/Program.java

@@ -38,4 +38,13 @@ public int hashCode() {
         return lines.hashCode();
     }
 
+    @Override
+    public String toString() {
+        StringBuilder buf = new StringBuilder();
+        for (Line line : lines) {
+            buf.append(line).append("\n");
+        }
+        return buf.toString();
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/RelationalOperator.java

@@ -1,5 +1,15 @@
 package com.grahamedgecombe.tinybasic.ast;
 
 public enum RelationalOperator {
-    EQ, NE, GT, GTE, LT, LTE
+    EQ("="), NE("<>"), GT(">"), GTE(">="), LT("<"), LTE("<=");
+
+    private final String string;
+
+    private RelationalOperator(String string) {
+        this.string = string;
+    }
+
+    public String toString() {
+        return string;
+    }
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/ReturnStatement.java

@@ -15,4 +15,9 @@ public int hashCode() {
         return 0;
     }
 
+    @Override
+    public String toString() {
+        return "RETURN";
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/UnaryExpression.java

@@ -38,4 +38,9 @@ public int hashCode() {
         return Objects.hash(operator, expression);
     }
 
+    @Override
+    public String toString() {
+        return "(" + operator + expression + ")";
+    }
+
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/UnaryOperator.java

@@ -1,5 +1,15 @@
 package com.grahamedgecombe.tinybasic.ast;
 
 public enum UnaryOperator {
-    PLUS, MINUS
+    PLUS('+'), MINUS('-');
+
+    private final char character;
+
+    private UnaryOperator(char character) {
+        this.character = character;
+    }
+
+    public String toString() {
+        return String.valueOf(character);
+    }
 }

src/main/java/com/grahamedgecombe/tinybasic/ast/VariableExpression.java

@@ -29,4 +29,9 @@ public int hashCode() {
         return name.hashCode();
     }
 
+    @Override
+    public String toString() {
+        return name;
+    }
+
 }