Move the status file parser into its own package.

tools/testing/dart/status_file.dart

Index: tools/testing/dart/status_file.dart
diff --git a/tools/testing/dart/status_file.dart b/tools/testing/dart/status_file.dart
deleted file mode 100644
index df64025ba03e3a67f922954f6c305aef7e3a2c99..0000000000000000000000000000000000000000
--- a/tools/testing/dart/status_file.dart
+++ /dev/null
@@ -1,198 +0,0 @@
-// Copyright (c) 2017, 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.
-
-import 'dart:io';
-
-import 'environment.dart';
-import 'expectation.dart';
-import 'path.dart';
-import 'status_expression.dart';
-
-/// Matches the header that begins a new section, like:
-///
-///     [ $compiler == dart2js && $minified ]
-final _sectionPattern = new RegExp(r"^\[(.+?)\]");
-
-/// Matches an entry that defines the status for a path in the current section,
-/// like:
-///
-///     some/path/to/some_test: Pass || Fail
-final _entryPattern = new RegExp(r"^([^:#]+):(.*)");
-
-/// Matches an issue number in a comment, like:
-///
-///     blah_test: Fail # Issue 1234
-///                       ^^^^
-final _issuePattern = new RegExp(r"[Ii]ssue (\d+)");
-
-/// A parsed status file, which describes how a collection of tests are
-/// expected to behave under various configurations and conditions.
-///
-/// Each status file is made of a series of sections. Each section begins with
-/// a header, followed by a series of entries. A header is enclosed in square
-/// brackets and contains a Boolean expression. That expression is evaluated in
-/// an environment. If it evaluates to true, then the entries after the header
-/// take effect.
-///
-/// Each entry is a glob-like file path followed by a colon and then a
-/// comma-separated list of [Expectation]s. The path may point to an individual
-/// file, or a directory, in which case it applies to all files under that path.
-///
-/// Entries may also appear before any section header, in which case they
-/// always apply.
-class StatusFile {
-  final String _path;
-  final List<StatusSection> sections = [];
-
-  /// Parses the status file at [_path].
-  StatusFile.read(this._path) {
-    var lines = new File(_path).readAsLinesSync();
-
-    // The current section whose rules are being parsed.
-    StatusSection section;
-
-    var lineNumber = 0;
-
-    for (var line in lines) {
-      lineNumber++;
-
-      fail(String message, [List<String> errors]) {
-        print('$message in "$_shortPath" line $lineNumber:\n$line');
-
-        if (errors != null) {
-          for (var error in errors) {
-            print("- ${error.replaceAll('\n', '\n  ')}");
-          }
-        }
-        exit(1);
-      }
-
-      // Strip off the comment and whitespace.
-      var source = line;
-      var comment = "";
-      var hashIndex = line.indexOf('#');
-      if (hashIndex >= 0) {
-        source = line.substring(0, hashIndex);
-        comment = line.substring(hashIndex);
-      }
-      source = source.trim();
-
-      // Ignore empty (or comment-only) lines.
-      if (source.isEmpty) continue;
-
-      // See if we are starting a new section.
-      var match = _sectionPattern.firstMatch(source);
-      if (match != null) {
-        try {
-          var condition = Expression.parse(match[1].trim());
-
-          var errors = <String>[];
-          condition.validate(errors);
-
-          if (errors.isNotEmpty) {
-            var s = errors.length > 1 ? "s" : "";
-            fail('Validation error$s', errors);
-          }
-
-          section = new StatusSection(condition);
-          sections.add(section);
-        } on FormatException {
-          fail("Status expression syntax error");
-        }
-        continue;
-      }
-
-      // Otherwise, it should be a new entry under the current section.
-      match = _entryPattern.firstMatch(source);
-      if (match != null) {
-        var path = match[1].trim();
-        // TODO(whesse): Handle test names ending in a wildcard (*).
-        var expectations = <Expectation>[];
-        for (var name in match[2].split(",")) {
-          name = name.trim();
-          try {
-            expectations.add(Expectation.find(name));
-          } on ArgumentError {
-            fail('Unrecognized test expectation "$name"');
-          }
-        }
-
-        var issue = _issueNumber(comment);
-
-        // If we haven't found a section header yet, create an implicit section
-        // that matches everything.
-        if (section == null) {
-          section = new StatusSection(null);
-          sections.add(section);
-        }
-
-        section.entries.add(new StatusEntry(path, expectations, issue));
-        continue;
-      }
-
-      fail("Unrecognized input");
-    }
-  }
-
-  /// Gets the path to this status file relative to the Dart repo root.
-  String get _shortPath {
-    var repoRoot = new Path(Platform.script
-            .toFilePath(windows: Platform.operatingSystem == "windows"))
-        .join(new Path("../../../../"));
-    return new Path(_path).relativeTo(repoRoot).toString();
-  }
-
-  /// Returns the issue number embedded in [comment] or `null` if there is none.
-  int _issueNumber(String comment) {
-    var match = _issuePattern.firstMatch(comment);
-    if (match == null) return null;
-
-    return int.parse(match[1]);
-  }
-
-  String toString() {
-    var buffer = new StringBuffer();
-    for (var section in sections) {
-      buffer.writeln("[${section._condition}]");
-
-      for (var entry in section.entries) {
-        buffer.write("${entry.path}: ${entry.expectations.join(', ')}");
-        if (entry.issue != null) buffer.write(" # Issue ${entry.issue}");
-        buffer.writeln();
-      }
-
-      buffer.writeln();
-    }
-
-    return buffer.toString();
-  }
-}
-
-/// One section in a status file.
-///
-/// Contains the condition from the header that begins the section, then all of
-/// the entries within the section.
-class StatusSection {
-  /// The expression that determines when this section is applied.
-  ///
-  /// May be `null` for paths that appear before any section header in the file.
-  /// In that case, the section always applies.
-  final Expression _condition;
-  final List<StatusEntry> entries = [];
-
-  /// Returns true if this section should apply in the given [environment].
-  bool isEnabled(Environment environment) =>
-      _condition == null || _condition.evaluate(environment);
-
-  StatusSection(this._condition);
-}
-
-/// Describes the test status of the file or files at a given path.
-class StatusEntry {
-  final String path;
-  final List<Expectation> expectations;
-  final int issue;
-
-  StatusEntry(this.path, this.expectations, this.issue);
-}