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Add a ModifiableCssVisitor

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This lets us traverse a modifiable CSS tree while preserving the fact
that it's modifiable.
This commit is contained in:
Natalie Weizenbaum 2019-03-22 13:56:44 -07:00
parent 14787d86e0
commit 511e525619
20 changed files with 72 additions and 21 deletions
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3
lib/src/ast/css/at_rule.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import 'node.dart';
import 'value.dart';
@ -18,4 +19,6 @@ abstract class CssAtRule extends CssParentNode {
/// This implies `children.isEmpty`, but the reverse is not true—for a rule
/// like `@foo {}`, [children] is empty but [isChildless] is `false`.
bool get isChildless;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssAtRule(this);
}

3
lib/src/ast/css/comment.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import 'node.dart';
/// A plain CSS comment.
@ -14,4 +15,6 @@ abstract class CssComment extends CssNode {
/// Whether this comment starts with `/*!` and so should be preserved even in
/// compressed mode.
bool get isPreserved;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssComment(this);
}

3
lib/src/ast/css/declaration.dart
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@ -5,6 +5,7 @@
import 'package:source_span/source_span.dart';
import '../../value.dart';
import '../../visitor/interface/css.dart';
import 'node.dart';
import 'value.dart';
@ -22,4 +23,6 @@ abstract class CssDeclaration extends CssNode {
/// where that variable was declared whereas [value.span] is the span where
/// the variable was used. Otherwise, this is identical to [value.span].
FileSpan get valueSpanForMap;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssDeclaration(this);
}

3
lib/src/ast/css/import.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import 'media_query.dart';
import 'node.dart';
import 'value.dart';
@ -18,4 +19,6 @@ abstract class CssImport extends CssNode {
/// The media query attached to this import.
List<CssMediaQuery> get media;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssImport(this);
}

3
lib/src/ast/css/keyframe_block.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import 'node.dart';
import 'value.dart';
@ -11,4 +12,6 @@ import 'value.dart';
abstract class CssKeyframeBlock extends CssParentNode {
/// The selector for this block.
CssValue<List<String>> get selector;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssKeyframeBlock(this);
}

3
lib/src/ast/css/media_rule.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import 'media_query.dart';
import 'node.dart';
@ -11,4 +12,6 @@ abstract class CssMediaRule extends CssParentNode {
///
/// This is never empty.
List<CssMediaQuery> get queries;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssMediaRule(this);
}

4
lib/src/ast/css/modifiable/at_rule.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../at_rule.dart';
import '../value.dart';
import 'node.dart';
@ -20,7 +20,7 @@ class ModifiableCssAtRule extends ModifiableCssParentNode implements CssAtRule {
{bool childless = false, this.value})
: isChildless = childless;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssAtRule(this);
T accept<T>(ModifiableCssVisitor<T> visitor) => visitor.visitCssAtRule(this);
ModifiableCssAtRule copyWithoutChildren() =>
ModifiableCssAtRule(name, span, childless: isChildless, value: value);

4
lib/src/ast/css/modifiable/comment.dart
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@ -5,7 +5,7 @@
import 'package:charcode/charcode.dart';
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../comment.dart';
import 'node.dart';
@ -18,5 +18,5 @@ class ModifiableCssComment extends ModifiableCssNode implements CssComment {
ModifiableCssComment(this.text, this.span);
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssComment(this);
T accept<T>(ModifiableCssVisitor<T> visitor) => visitor.visitCssComment(this);
}

5
lib/src/ast/css/modifiable/declaration.dart
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@ -5,7 +5,7 @@
import 'package:source_span/source_span.dart';
import '../../../value.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../declaration.dart';
import '../value.dart';
import 'node.dart';
@ -22,5 +22,6 @@ class ModifiableCssDeclaration extends ModifiableCssNode
{FileSpan valueSpanForMap})
: valueSpanForMap = valueSpanForMap ?? span;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssDeclaration(this);
T accept<T>(ModifiableCssVisitor<T> visitor) =>
visitor.visitCssDeclaration(this);
}

4
lib/src/ast/css/modifiable/import.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../import.dart';
import '../media_query.dart';
import '../value.dart';
@ -29,5 +29,5 @@ class ModifiableCssImport extends ModifiableCssNode implements CssImport {
{this.supports, Iterable<CssMediaQuery> media})
: media = media == null ? null : List.unmodifiable(media);
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssImport(this);
T accept<T>(ModifiableCssVisitor<T> visitor) => visitor.visitCssImport(this);
}

5
lib/src/ast/css/modifiable/keyframe_block.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../keyframe_block.dart';
import '../value.dart';
import 'node.dart';
@ -17,7 +17,8 @@ class ModifiableCssKeyframeBlock extends ModifiableCssParentNode
ModifiableCssKeyframeBlock(this.selector, this.span);
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssKeyframeBlock(this);
T accept<T>(ModifiableCssVisitor<T> visitor) =>
visitor.visitCssKeyframeBlock(this);
ModifiableCssKeyframeBlock copyWithoutChildren() =>
ModifiableCssKeyframeBlock(selector, span);

5
lib/src/ast/css/modifiable/media_rule.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../media_query.dart';
import '../media_rule.dart';
import 'node.dart';
@ -22,7 +22,8 @@ class ModifiableCssMediaRule extends ModifiableCssParentNode
}
}
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssMediaRule(this);
T accept<T>(ModifiableCssVisitor<T> visitor) =>
visitor.visitCssMediaRule(this);
ModifiableCssMediaRule copyWithoutChildren() =>
ModifiableCssMediaRule(queries, span);

4
lib/src/ast/css/modifiable/node.dart
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@ -4,7 +4,7 @@
import 'dart:collection';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../at_rule.dart';
import '../node.dart';
import '../style_rule.dart';
@ -57,7 +57,7 @@ abstract class ModifiableCssNode extends CssNode {
}
}
T accept<T>(CssVisitor<T> visitor);
T accept<T>(ModifiableCssVisitor<T> visitor);
/// Removes [this] from [parent]'s child list.
///

5
lib/src/ast/css/modifiable/style_rule.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../../selector.dart';
import '../style_rule.dart';
import 'node.dart';
@ -28,7 +28,8 @@ class ModifiableCssStyleRule extends ModifiableCssParentNode
: selector = selector,
originalSelector = originalSelector ?? selector.value;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssStyleRule(this);
T accept<T>(ModifiableCssVisitor<T> visitor) =>
visitor.visitCssStyleRule(this);
ModifiableCssStyleRule copyWithoutChildren() =>
ModifiableCssStyleRule(selector, span,

5
lib/src/ast/css/modifiable/stylesheet.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../stylesheet.dart';
import 'node.dart';
@ -15,7 +15,8 @@ class ModifiableCssStylesheet extends ModifiableCssParentNode
ModifiableCssStylesheet(this.span);
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssStylesheet(this);
T accept<T>(ModifiableCssVisitor<T> visitor) =>
visitor.visitCssStylesheet(this);
ModifiableCssStylesheet copyWithoutChildren() =>
ModifiableCssStylesheet(span);

5
lib/src/ast/css/modifiable/supports_rule.dart
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@ -4,7 +4,7 @@
import 'package:source_span/source_span.dart';
import '../../../visitor/interface/css.dart';
import '../../../visitor/interface/modifiable_css.dart';
import '../supports_rule.dart';
import '../value.dart';
import 'node.dart';
@ -17,7 +17,8 @@ class ModifiableCssSupportsRule extends ModifiableCssParentNode
ModifiableCssSupportsRule(this.condition, this.span);
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssSupportsRule(this);
T accept<T>(ModifiableCssVisitor<T> visitor) =>
visitor.visitCssSupportsRule(this);
ModifiableCssSupportsRule copyWithoutChildren() =>
ModifiableCssSupportsRule(condition, span);

3
lib/src/ast/css/style_rule.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import '../selector.dart';
import 'node.dart';
import 'value.dart';
@ -14,4 +15,6 @@ import 'value.dart';
abstract class CssStyleRule extends CssParentNode {
/// The selector for this rule.
CssValue<SelectorList> get selector;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssStyleRule(this);
}

3
lib/src/ast/css/supports_rule.dart
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@ -2,6 +2,7 @@
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../visitor/interface/css.dart';
import 'node.dart';
import 'value.dart';
@ -9,4 +10,6 @@ import 'value.dart';
abstract class CssSupportsRule extends CssParentNode {
/// The supports condition.
CssValue<String> get condition;
T accept<T>(CssVisitor<T> visitor) => visitor.visitCssSupportsRule(this);
}

3
lib/src/visitor/interface/css.dart
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@ -3,11 +3,12 @@
// https://opensource.org/licenses/MIT.
import '../../ast/css.dart';
import 'modifiable_css.dart';
/// An interface for [visitors][] that traverse CSS statements.
///
/// [visitors]: https://en.wikipedia.org/wiki/Visitor_pattern
abstract class CssVisitor<T> {
abstract class CssVisitor<T> implements ModifiableCssVisitor<T> {
T visitCssAtRule(CssAtRule node);
T visitCssComment(CssComment node);
T visitCssDeclaration(CssDeclaration node);

20
lib/src/visitor/interface/modifiable_css.dart Normal file
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@ -0,0 +1,20 @@
// Copyright 2019 Google Inc. Use of this source code is governed by an
// MIT-style license that can be found in the LICENSE file or at
// https://opensource.org/licenses/MIT.
import '../../ast/css/modifiable.dart';
/// An interface for [visitors][] that traverse CSS statements.
///
/// [visitors]: https://en.wikipedia.org/wiki/Visitor_pattern
abstract class ModifiableCssVisitor<T> {
T visitCssAtRule(ModifiableCssAtRule node);
T visitCssComment(ModifiableCssComment node);
T visitCssDeclaration(ModifiableCssDeclaration node);
T visitCssImport(ModifiableCssImport node);
T visitCssKeyframeBlock(ModifiableCssKeyframeBlock node);
T visitCssMediaRule(ModifiableCssMediaRule node);
T visitCssStyleRule(ModifiableCssStyleRule node);
T visitCssStylesheet(ModifiableCssStylesheet node);
T visitCssSupportsRule(ModifiableCssSupportsRule node);
}