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Unified Diff: sdk/lib/_internal/pub_generated/lib/src/preprocess.dart

Issue 937243002: Revert "Revert "Use native async/await support in pub."" (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 5 years, 10 months ago
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Index: sdk/lib/_internal/pub_generated/lib/src/preprocess.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/preprocess.dart b/sdk/lib/_internal/pub_generated/lib/src/preprocess.dart
deleted file mode 100644
index bf05f89fae1cdd0e320db0f7379a006b4987c423..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/preprocess.dart
+++ /dev/null
@@ -1,144 +0,0 @@
-// Copyright (c) 2014, 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 pub.preprocess;
-
-import 'package:pub_semver/pub_semver.dart';
-import 'package:string_scanner/string_scanner.dart';
-
-/// Runs a simple preprocessor over [input] to remove sections that are
-/// incompatible with the available barback version.
-///
-/// [versions] are the available versions of each installed package, and
-/// [sourceUrl] is a [String] or [Uri] indicating where [input] came from. It's
-/// used for error reporting.
-///
-/// For the most part, the preprocessor leaves text in the source document
-/// alone. However, it handles two types of lines specially. Lines that begin
-/// with `//>` are uncommented by the preprocessor, and lines that begin with
-/// `//#` are operators.
-///
-/// The preprocessor currently supports one top-level operator, "if":
-///
-/// //# if barback >=0.14.1
-/// ...
-/// //# else
-/// ...
-/// //# end
-///
-/// If can check against any package installed in the current package. It can
-/// check the version of the package, as above, or (if the version range is
-/// omitted) whether the package exists at all. If the condition is true,
-/// everything within the first block is included in the output and everything
-/// within the second block is removed; otherwise, the first block is removed
-/// and the second block is included. The `else` block is optional.
-///
-/// It's important that the preprocessor syntax also be valid Dart code, because
-/// pub loads the source files before preprocessing and runs them against the
-/// version of barback that was compiled into pub. This is why the `//>` syntax
-/// exists: so that code can be hidden from the running pub process but still be
-/// visible to the barback isolate. For example:
-///
-/// //# if barback >= 0.14.1
-/// ClassMirror get aggregateClass => reflectClass(AggregateTransformer);
-/// //# else
-/// //> ClassMirror get aggregateClass => null;
-/// //# end
-String preprocess(String input, Map<String, Version> versions, sourceUrl) {
- // Short-circuit if there are no preprocessor directives in the file.
- if (!input.contains(new RegExp(r"^//[>#]", multiLine: true))) return input;
- return new _Preprocessor(input, versions, sourceUrl).run();
-}
-
-/// The preprocessor class.
-class _Preprocessor {
- /// The scanner over the input string.
- final StringScanner _scanner;
-
- final Map<String, Version> _versions;
-
- /// The buffer to which the output is written.
- final _buffer = new StringBuffer();
-
- _Preprocessor(String input, this._versions, sourceUrl)
- : _scanner = new StringScanner(input, sourceUrl: sourceUrl);
-
- /// Run the preprocessor and return the processed output.
- String run() {
- while (!_scanner.isDone) {
- if (_scanner.scan(new RegExp(r"//#[ \t]*"))) {
- _if();
- } else {
- _emitText();
- }
- }
-
- _scanner.expectDone();
- return _buffer.toString();
- }
-
- /// Emit lines of the input document directly until an operator is
- /// encountered.
- void _emitText() {
- while (!_scanner.isDone && !_scanner.matches("//#")) {
- if (_scanner.scan("//>")) {
- if (!_scanner.matches("\n")) _scanner.expect(" ");
- }
-
- _scanner.scan(new RegExp(r"[^\n]*\n?"));
- _buffer.write(_scanner.lastMatch[0]);
- }
- }
-
- /// Move through lines of the input document without emitting them until an
- /// operator is encountered.
- void _ignoreText() {
- while (!_scanner.isDone && !_scanner.matches("//#")) {
- _scanner.scan(new RegExp(r"[^\n]*\n?"));
- }
- }
-
- /// Handle an `if` operator.
- void _if() {
- _scanner.expect(new RegExp(r"if[ \t]+"), name: "if statement");
- _scanner.expect(new RegExp(r"[a-zA-Z0-9_]+"), name: "package name");
- var package = _scanner.lastMatch[0];
-
- _scanner.scan(new RegExp(r"[ \t]*"));
- var constraint = VersionConstraint.any;
- if (_scanner.scan(new RegExp(r"[^\n]+"))) {
- try {
- constraint = new VersionConstraint.parse(_scanner.lastMatch[0]);
- } on FormatException catch (error) {
- _scanner.error("Invalid version constraint: ${error.message}");
- }
- }
- _scanner.expect("\n");
-
- var allowed =
- _versions.containsKey(package) &&
- constraint.allows(_versions[package]);
- if (allowed) {
- _emitText();
- } else {
- _ignoreText();
- }
-
- _scanner.expect("//#");
- _scanner.scan(new RegExp(r"[ \t]*"));
- if (_scanner.scan("else")) {
- _scanner.expect("\n");
- if (allowed) {
- _ignoreText();
- } else {
- _emitText();
- }
- _scanner.expect("//#");
- _scanner.scan(new RegExp(r"[ \t]*"));
- }
-
- _scanner.expect("end");
- if (!_scanner.isDone) _scanner.expect("\n");
- }
-}
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