Template parser

utils/template/tool.dart

+// 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.
+
+#library('templatetool');
+
+#import('dart:io');
+#import('template.dart');
+#import('../../frog/file_system.dart');
+#import('../../frog/file_system_vm.dart');
+
+
+FileSystem files;
+
+/** Invokes [callback] and returns how long it took to execute in ms. */
+num time(callback()) {
+  final watch = new Stopwatch();
+  watch.start();
+  callback();
+  watch.stop();
+  return watch.elapsedInMs();
+}
+
+// Color constants used for generating messages.
+String _GREEN_COLOR = '\u001b[32m';
+String _NO_COLOR = '\u001b[0m';
+
+printStats(String phase, num elapsed, [String filename = '']) {
+  print('${phase}${_GREEN_COLOR} ${filename}${_NO_COLOR} in ${elapsed} msec.');
+}
+
+/**
+ * Run from the `utils/css` directory.
+ */
+void main() {
+  // argument 0 - sourcefile full path
+  // argument 1 - outputfile full path
+  var optionArgs = new Options().arguments;
+
+  String sourceFullFn = optionArgs[0];
+  String outputFullFn = optionArgs[1];
+
+  String sourcePath;
+  String sourceFilename;
+  int idxBeforeFilename = sourceFullFn.lastIndexOf('/');
+  if (idxBeforeFilename >= 0) {
+    sourcePath = sourceFullFn.substring(0, idxBeforeFilename + 1);
+    sourceFilename = sourceFullFn.substring(idxBeforeFilename + 1);
+  }
+
+  String outPath;
+  String outFilename;
+  idxBeforeFilename = outputFullFn.lastIndexOf('/');
+  if (idxBeforeFilename >= 0) {
+    outPath = outputFullFn.substring(0, idxBeforeFilename + 1);
+    outFilename = outputFullFn.substring(idxBeforeFilename + 1);
+  }
+
+  if (sourceFilename.length == 0 || outFilename.length == 0) {
+    print("Unknown command:\r");
+    print("    Format: sourcefile outputfile [--options]");
+    print("      outputfile - template file filename.tmpl");
+    print("      outputfile - generated dart source file filename.dart");
+    return;
+  }
+
+//  files = new NodeFileSystem();
+  files = new VMFileSystem();
+
+  // TODO(terry): Cleanup options handling need common options between template
+  //              and CSS parsers also cleanup above cruft.
+
+  // TODO(terry): Pass on switches.
+  var args = [];
+  parseOptions(args, files);
+
+  initHtmlWorld(false);
+
+  if (!files.fileExists(sourceFullFn)) {
+    // Display colored error message if file is missing.
+    print(world.fatal("CSS source file missing - ${sourceFullFn}"));
+  } else {
+
+    String source = files.readAll(sourceFullFn);
+
+    List<Template> templates;
+    final parsedElapsed = time(() {
+      templates = templateParseAndValidate(source);
+    });
+
+    StringBuffer code = new StringBuffer();
+
+    num codegenElapsed;
+    if (world.errors == 0) {
+      // Generate the Dart class(es) for all template(s).
+      codegenElapsed = time(() {
+        code.add(Codegen.generate(templates, outFilename));
+      });
+    }
+
+    printStats("Parsed", parsedElapsed, sourceFullFn);
+    printStats("Codegen", codegenElapsed, sourceFullFn);
+
+    final outputElapsed = time(() {
+      files.writeString(outputFullFn, code.toString());
+    });
+
+    printStats("Wrote file", codegenElapsed, outputFullFn);
+  }
+}