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recursive_ast.dart
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recursive_ast.dart
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// 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 'package:meta/meta.dart';
import '../util/nullable.dart';
import '../ast/sass.dart';
import 'interface/expression.dart';
import 'recursive_statement.dart';
/// A visitor that recursively traverses each statement and expression in a Sass
/// AST.
///
/// This extends [RecursiveStatementVisitor] to traverse each expression in
/// addition to each statement. It adds even more protected methods:
///
/// * [visitArgumentInvocation]
/// * [visitSupportsCondition]
/// * [visitInterpolation]
///
/// {@category Visitor}
mixin RecursiveAstVisitor on RecursiveStatementVisitor
implements ExpressionVisitor<void> {
void visitAtRootRule(AtRootRule node) {
node.query.andThen(visitInterpolation);
super.visitAtRootRule(node);
}
void visitAtRule(AtRule node) {
visitInterpolation(node.name);
node.value.andThen(visitInterpolation);
super.visitAtRule(node);
}
void visitCalculationExpression(CalculationExpression node) {
for (var argument in node.arguments) {
argument.accept(this);
}
}
void visitContentRule(ContentRule node) {
visitArgumentInvocation(node.arguments);
}
void visitDebugRule(DebugRule node) {
visitExpression(node.expression);
}
void visitDeclaration(Declaration node) {
visitInterpolation(node.name);
node.value.andThen(visitExpression);
super.visitDeclaration(node);
}
void visitEachRule(EachRule node) {
visitExpression(node.list);
super.visitEachRule(node);
}
void visitErrorRule(ErrorRule node) {
visitExpression(node.expression);
}
void visitExtendRule(ExtendRule node) {
visitInterpolation(node.selector);
}
void visitForRule(ForRule node) {
visitExpression(node.from);
visitExpression(node.to);
super.visitForRule(node);
}
void visitIfRule(IfRule node) {
for (var clause in node.clauses) {
visitExpression(clause.expression);
for (var child in clause.children) {
child.accept(this);
}
}
node.lastClause.andThen((lastClause) {
for (var child in lastClause.children) {
child.accept(this);
}
});
}
void visitImportRule(ImportRule node) {
for (var import in node.imports) {
if (import is StaticImport) {
visitInterpolation(import.url);
import.modifiers.andThen(visitInterpolation);
}
}
}
void visitIncludeRule(IncludeRule node) {
visitArgumentInvocation(node.arguments);
super.visitIncludeRule(node);
}
void visitLoudComment(LoudComment node) {
visitInterpolation(node.text);
}
void visitMediaRule(MediaRule node) {
visitInterpolation(node.query);
super.visitMediaRule(node);
}
void visitMixinRule(MixinRule node) => visitCallableDeclaration(node);
void visitReturnRule(ReturnRule node) {
visitExpression(node.expression);
}
void visitStyleRule(StyleRule node) {
visitInterpolation(node.selector);
super.visitStyleRule(node);
}
void visitSupportsRule(SupportsRule node) {
visitSupportsCondition(node.condition);
super.visitSupportsRule(node);
}
void visitUseRule(UseRule node) {
for (var variable in node.configuration) {
variable.expression.accept(this);
}
}
void visitVariableDeclaration(VariableDeclaration node) {
visitExpression(node.expression);
}
void visitWarnRule(WarnRule node) {
visitExpression(node.expression);
}
void visitWhileRule(WhileRule node) {
visitExpression(node.condition);
super.visitWhileRule(node);
}
void visitExpression(Expression expression) {
expression.accept(this);
}
void visitBinaryOperationExpression(BinaryOperationExpression node) {
node.left.accept(this);
node.right.accept(this);
}
void visitBooleanExpression(BooleanExpression node) {}
void visitColorExpression(ColorExpression node) {}
void visitForwardRule(ForwardRule node) {
for (var variable in node.configuration) {
variable.expression.accept(this);
}
}
void visitFunctionExpression(FunctionExpression node) {
visitArgumentInvocation(node.arguments);
}
void visitInterpolatedFunctionExpression(
InterpolatedFunctionExpression node) {
visitInterpolation(node.name);
visitArgumentInvocation(node.arguments);
}
void visitIfExpression(IfExpression node) {
visitArgumentInvocation(node.arguments);
}
void visitListExpression(ListExpression node) {
for (var item in node.contents) {
item.accept(this);
}
}
void visitMapExpression(MapExpression node) {
for (var pair in node.pairs) {
pair.item1.accept(this);
pair.item2.accept(this);
}
}
void visitNullExpression(NullExpression node) {}
void visitNumberExpression(NumberExpression node) {}
void visitParenthesizedExpression(ParenthesizedExpression node) {
node.expression.accept(this);
}
void visitSelectorExpression(SelectorExpression node) {}
void visitStringExpression(StringExpression node) {
visitInterpolation(node.text);
}
void visitSupportsExpression(SupportsExpression node) {
visitSupportsCondition(node.condition);
}
void visitUnaryOperationExpression(UnaryOperationExpression node) {
node.operand.accept(this);
}
void visitValueExpression(ValueExpression node) {}
void visitVariableExpression(VariableExpression node) {}
@protected
void visitCallableDeclaration(CallableDeclaration node) {
for (var argument in node.arguments.arguments) {
argument.defaultValue.andThen(visitExpression);
}
super.visitCallableDeclaration(node);
}
/// Visits each expression in an [invocation].
///
/// The default implementation of the visit methods calls this to visit any
/// argument invocation in a statement.
@protected
void visitArgumentInvocation(ArgumentInvocation invocation) {
for (var expression in invocation.positional) {
visitExpression(expression);
}
for (var expression in invocation.named.values) {
visitExpression(expression);
}
invocation.rest.andThen(visitExpression);
invocation.keywordRest.andThen(visitExpression);
}
/// Visits each expression in [condition].
///
/// The default implementation of the visit methods call this to visit any
/// [SupportsCondition] they encounter.
@protected
void visitSupportsCondition(SupportsCondition condition) {
if (condition is SupportsOperation) {
visitSupportsCondition(condition.left);
visitSupportsCondition(condition.right);
} else if (condition is SupportsNegation) {
visitSupportsCondition(condition.condition);
} else if (condition is SupportsInterpolation) {
visitExpression(condition.expression);
} else if (condition is SupportsDeclaration) {
visitExpression(condition.name);
visitExpression(condition.value);
}
}
/// Visits each expression in an [interpolation].
///
/// The default implementation of the visit methods call this to visit any
/// interpolation in a statement.
@protected
void visitInterpolation(Interpolation interpolation) {
for (var node in interpolation.contents) {
if (node is Expression) visitExpression(node);
}
}
}