[cfe] Implement toText for Binary/Unary/ParenthesizedExpression

Change-Id: Ic3585081aa8910a75c54fadb8e8e583445d0d532
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155328
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>

Author: johnniwinther

pkg/front_end/lib/src/fasta/kernel/internal_ast.dart

@@ -3555,6 +3555,16 @@ class BinaryExpression extends InternalExpression {
   String toString() {
     return "BinaryExpression(${toStringInternal()})";
   }
+
+  @override
+  int get precedence => Precedence.binaryPrecedence[binaryName.name];
+
+  @override
+  void toTextInternal(AstPrinter printer) {
+    printer.writeExpression(left, minimumPrecedence: precedence);
+    printer.write(' ${binaryName.name} ');
+    printer.writeExpression(right, minimumPrecedence: precedence);
+  }
 }
 
 /// Internal expression for a unary expression.
@@ -3588,10 +3598,23 @@ class UnaryExpression extends InternalExpression {
     }
   }
 
+  @override
+  int get precedence => Precedence.PREFIX;
+
   @override
   String toString() {
     return "UnaryExpression(${toStringInternal()})";
   }
+
+  @override
+  void toTextInternal(AstPrinter printer) {
+    if (unaryName == unaryMinusName) {
+      printer.write('-');
+    } else {
+      printer.write('${unaryName.name}');
+    }
+    printer.writeExpression(expression, minimumPrecedence: precedence);
+  }
 }
 
 /// Internal expression for a parenthesized expression.
@@ -3624,10 +3647,20 @@ class ParenthesizedExpression extends InternalExpression {
     }
   }
 
+  @override
+  int get precedence => Precedence.CALLEE;
+
   @override
   String toString() {
     return "ParenthesizedExpression(${toStringInternal()})";
   }
+
+  @override
+  void toTextInternal(AstPrinter printer) {
+    printer.write('(');
+    printer.writeExpression(expression);
+    printer.write(')');
+  }
 }
 
 /// Creates a [Let] of [variable] with the given [body] using

pkg/front_end/test/text_representation/internal_ast_text_representation_test.dart

@@ -644,11 +644,59 @@ void _testEqualsExpression() {
 0 != 1''');
 }
 
-void _testBinaryExpression() {}
+void _testBinaryExpression() {
+  testExpression(
+      new BinaryExpression(new IntLiteral(0), new Name('+'), new IntLiteral(1)),
+      '''
+0 + 1''');
+  testExpression(
+      new BinaryExpression(
+          new BinaryExpression(
+              new IntLiteral(0), new Name('-'), new IntLiteral(1)),
+          new Name('+'),
+          new BinaryExpression(
+              new IntLiteral(2), new Name('-'), new IntLiteral(3))),
+      '''
+0 - 1 + 2 - 3''');
+  testExpression(
+      new BinaryExpression(
+          new BinaryExpression(
+              new IntLiteral(0), new Name('*'), new IntLiteral(1)),
+          new Name('+'),
+          new BinaryExpression(
+              new IntLiteral(2), new Name('/'), new IntLiteral(3))),
+      '''
+0 * 1 + 2 / 3''');
+  testExpression(
+      new BinaryExpression(
+          new BinaryExpression(
+              new IntLiteral(0), new Name('+'), new IntLiteral(1)),
+          new Name('*'),
+          new BinaryExpression(
+              new IntLiteral(2), new Name('-'), new IntLiteral(3))),
+      '''
+(0 + 1) * (2 - 3)''');
+}
 
-void _testUnaryExpression() {}
+void _testUnaryExpression() {
+  testExpression(new UnaryExpression(new Name('unary-'), new IntLiteral(0)), '''
+-0''');
+  testExpression(new UnaryExpression(new Name('~'), new IntLiteral(0)), '''
+~0''');
 
-void _testParenthesizedExpression() {}
+  testExpression(
+      new UnaryExpression(
+          new Name('unary-'),
+          new BinaryExpression(
+              new IntLiteral(0), new Name('+'), new IntLiteral(1))),
+      '''
+-(0 + 1)''');
+}
+
+void _testParenthesizedExpression() {
+  testExpression(new ParenthesizedExpression(new IntLiteral(0)), '''
+(0)''');
+}
 
 void _testSpreadElement() {
   testExpression(new SpreadElement(new IntLiteral(0), false), '''