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Unified Diff: utils/css/treebase.dart

Issue 9695048: Template parser (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Siggi's comments Created 8 years, 9 months ago
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Index: utils/css/treebase.dart
diff --git a/utils/css/treebase.dart b/utils/css/treebase.dart
new file mode 100644
index 0000000000000000000000000000000000000000..c5d517add1db9bae71607d3ee5bd1f31866fe2fa
--- /dev/null
+++ b/utils/css/treebase.dart
@@ -0,0 +1,124 @@
+// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+/**
+ * The base type for all nodes in a dart abstract syntax tree.
+ */
+class ASTNode {
+ /** The source code this [ASTNode] represents. */
+ SourceSpan span;
+
+ ASTNode(this.span) {}
+
+ /** Classic double-dispatch visitor for implementing passes. */
+ abstract visit(TreeVisitor visitor);
+
+ /** A multiline string showing the node and its children. */
+ String toDebugString() {
+ var to = new TreeOutput();
+ var tp = new TreePrinter(to);
+ this.visit(tp);
+ return to.buf.toString();
+ }
+}
+
+/** The base type for expressions. */
+// TODO(terry): Should be abstract class; but frog doesn't support abstract.
+class Expression extends ASTNode {
+ Expression(SourceSpan span): super(span);
+
+ visit(TreeVisitor visitor) {} // TODO(terry): remove when abstract.
+}
+
+/** The base type for a reference to a [Type]. */
+// TODO(terry): Should be abstract class; but frog doesn't support abstract.
+class TypeReference extends ASTNode {
+ TypeReference(SourceSpan span): super(span);
+
+ visit(TreeVisitor visitor) {} // TODO(terry): remove when abstract.
+}
+
+// TODO(jimhug): Clean-up and factor out of core.
+/** Simple class to provide a textual dump of trees for debugging. */
+class TreeOutput {
+ int depth;
+ StringBuffer buf;
+
+ var printer;
+
+ static void dump(ASTNode node) {
+ var o = new TreeOutput();
+ node.visit(new TreePrinter(o));
+ print(o.buf);
+ }
+
+ TreeOutput(): this.depth = 0, this.buf = new StringBuffer() {
+ }
+
+ void write(String s) {
+ for (int i=0; i < depth; i++) {
+ buf.add(' ');
+ }
+ buf.add(s);
+ }
+
+ void writeln(String s) {
+ write(s);
+ buf.add('\n');
+ }
+
+ void heading(String name, span) {
+ write(name);
+ buf.add(' (${span.locationText})');
+ buf.add('\n');
+ }
+
+ String toValue(value) {
+ if (value == null) return 'null';
+ else if (value is Identifier) return value.name;
+ else return value.toString();
+ }
+
+ void writeNode(String label, ASTNode node) {
+ write(label + ': ');
+ depth += 1;
+ if (node != null) node.visit(printer);
+ else writeln('null');
+ depth -= 1;
+ }
+
+ void writeValue(String label, value) {
+ var v = toValue(value);
+ writeln('${label}: ${v}');
+ }
+
+ void writeList(String label, List list) {
+ write(label + ': ');
+ if (list == null) {
+ buf.add('null');
+ buf.add('\n');
+ } else {
+ for (var item in list) {
+ buf.add(item.toString());
+ buf.add(', ');
+ }
+ buf.add('\n');
+ }
+ }
+
+ void writeNodeList(String label, List list) {
+ writeln('${label} [');
+ if (list != null) {
+ depth += 1;
+ for (var node in list) {
+ if (node != null) {
+ node.visit(printer);
+ } else {
+ writeln('null');
+ }
+ }
+ depth -= 1;
+ writeln(']');
+ }
+ }
+}
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