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Unified Diff: sdk/lib/_internal/lib/regexp_helper.dart

Issue 538513002: Move js library back into compiler directory. (Closed) Base URL: https://dart.googlecode.com/svn/branches/bleeding_edge/dart
Patch Set: Created 6 years, 3 months ago
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Index: sdk/lib/_internal/lib/regexp_helper.dart
diff --git a/sdk/lib/_internal/lib/regexp_helper.dart b/sdk/lib/_internal/lib/regexp_helper.dart
deleted file mode 100644
index 7f930ebf170db0e25da4322808c609eb09090e11..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/lib/regexp_helper.dart
+++ /dev/null
@@ -1,218 +0,0 @@
-// Copyright (c) 2012, 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.
-
-part of _js_helper;
-
-// Helper method used by internal libraries.
-regExpGetNative(JSSyntaxRegExp regexp) => regexp._nativeRegExp;
-
-/**
- * Returns a native version of the RegExp with the global flag set.
- *
- * The RegExp's `lastIndex` property is zero when it is returned.
- *
- * The returned regexp is shared, and its `lastIndex` property may be
- * modified by other uses, so the returned regexp must be used immediately
- * when it's returned, with no user-provided code run in between.
- */
-regExpGetGlobalNative(JSSyntaxRegExp regexp) {
- var nativeRegexp = regexp._nativeGlobalVersion;
- JS("void", "#.lastIndex = 0", nativeRegexp);
- return nativeRegexp;
-}
-
-class JSSyntaxRegExp implements RegExp {
- final String pattern;
- final _nativeRegExp;
- var _nativeGlobalRegExp;
- var _nativeAnchoredRegExp;
-
-
- JSSyntaxRegExp(String source,
- { bool multiLine: false,
- bool caseSensitive: true })
- : this.pattern = source,
- this._nativeRegExp =
- makeNative(source, multiLine, caseSensitive, false);
-
- get _nativeGlobalVersion {
- if (_nativeGlobalRegExp != null) return _nativeGlobalRegExp;
- return _nativeGlobalRegExp = makeNative(pattern,
- _isMultiLine,
- _isCaseSensitive,
- true);
- }
-
- get _nativeAnchoredVersion {
- if (_nativeAnchoredRegExp != null) return _nativeAnchoredRegExp;
- // An "anchored version" of a regexp is created by adding "|()" to the
- // source. This means that the regexp always matches at the first position
- // that it tries, and you can see if the original regexp matched, or it
- // was the added zero-width match that matched, by looking at the last
- // capture. If it is a String, the match participated, otherwise it didn't.
- return _nativeAnchoredRegExp = makeNative("$pattern|()",
- _isMultiLine,
- _isCaseSensitive,
- true);
- }
-
- bool get _isMultiLine => JS("bool", "#.multiline", _nativeRegExp);
- bool get _isCaseSensitive => JS("bool", "!#.ignoreCase", _nativeRegExp);
-
- static makeNative(
- String source, bool multiLine, bool caseSensitive, bool global) {
- checkString(source);
- String m = multiLine ? 'm' : '';
- String i = caseSensitive ? '' : 'i';
- String g = global ? 'g' : '';
- // We're using the JavaScript's try catch instead of the Dart one
- // to avoid dragging in Dart runtime support just because of using
- // RegExp.
- var regexp = JS('',
- '(function() {'
- 'try {'
- 'return new RegExp(#, # + # + #);'
- '} catch (e) {'
- 'return e;'
- '}'
- '})()', source, m, i, g);
- if (JS('bool', '# instanceof RegExp', regexp)) return regexp;
- // The returned value is the JavaScript exception. Turn it into a
- // Dart exception.
- String errorMessage = JS('String', r'String(#)', regexp);
- throw new FormatException(
- "Illegal RegExp pattern: $source, $errorMessage");
- }
-
- Match firstMatch(String string) {
- List<String> m = JS('JSExtendableArray|Null',
- r'#.exec(#)',
- _nativeRegExp,
- checkString(string));
- if (m == null) return null;
- return new _MatchImplementation(this, m);
- }
-
- bool hasMatch(String string) {
- return JS('bool', r'#.test(#)', _nativeRegExp, checkString(string));
- }
-
- String stringMatch(String string) {
- var match = firstMatch(string);
- if (match != null) return match.group(0);
- return null;
- }
-
- Iterable<Match> allMatches(String string, [int start = 0]) {
- checkString(string);
- checkInt(start);
- if (start < 0 || start > string.length) {
- throw new RangeError.range(start, 0, string.length);
- }
- return new _AllMatchesIterable(this, string, start);
- }
-
- Match _execGlobal(String string, int start) {
- Object regexp = _nativeGlobalVersion;
- JS("void", "#.lastIndex = #", regexp, start);
- List match = JS("JSExtendableArray|Null", "#.exec(#)", regexp, string);
- if (match == null) return null;
- return new _MatchImplementation(this, match);
- }
-
- Match _execAnchored(String string, int start) {
- Object regexp = _nativeAnchoredVersion;
- JS("void", "#.lastIndex = #", regexp, start);
- List match = JS("JSExtendableArray|Null", "#.exec(#)", regexp, string);
- if (match == null) return null;
- // If the last capture group participated, the original regexp did not
- // match at the start position.
- if (match[match.length - 1] != null) return null;
- match.length -= 1;
- return new _MatchImplementation(this, match);
- }
-
- Match matchAsPrefix(String string, [int start = 0]) {
- if (start < 0 || start > string.length) {
- throw new RangeError.range(start, 0, string.length);
- }
- return _execAnchored(string, start);
- }
-
- bool get isMultiLine => _isMultiLine;
- bool get isCaseSensitive => _isCaseSensitive;
-}
-
-class _MatchImplementation implements Match {
- final Pattern pattern;
- // Contains a JS RegExp match object.
- // It is an Array of String values with extra "index" and "input" properties.
- final List<String> _match;
-
- _MatchImplementation(this.pattern, this._match) {
- assert(JS("var", "#.input", _match) is String);
- assert(JS("var", "#.index", _match) is int);
- }
-
- String get input => JS("String", "#.input", _match);
- int get start => JS("int", "#.index", _match);
- int get end => start + _match[0].length;
-
- String group(int index) => _match[index];
- String operator [](int index) => group(index);
- int get groupCount => _match.length - 1;
-
- List<String> groups(List<int> groups) {
- List<String> out = [];
- for (int i in groups) {
- out.add(group(i));
- }
- return out;
- }
-}
-
-class _AllMatchesIterable extends IterableBase<Match> {
- final JSSyntaxRegExp _re;
- final String _string;
- final int _start;
-
- _AllMatchesIterable(this._re, this._string, this._start);
-
- Iterator<Match> get iterator => new _AllMatchesIterator(_re, _string, _start);
-}
-
-class _AllMatchesIterator implements Iterator<Match> {
- final JSSyntaxRegExp _regExp;
- String _string;
- int _nextIndex;
- Match _current;
-
- _AllMatchesIterator(this._regExp, this._string, this._nextIndex);
-
- Match get current => _current;
-
- bool moveNext() {
- if (_string == null) return false;
- if (_nextIndex <= _string.length) {
- var match = _regExp._execGlobal(_string, _nextIndex);
- if (match != null) {
- _current = match;
- int nextIndex = match.end;
- if (match.start == nextIndex) {
- nextIndex++;
- }
- _nextIndex = nextIndex;
- return true;
- }
- }
- _current = null;
- _string = null; // Marks iteration as ended.
- return false;
- }
-}
-
-/** Find the first match of [regExp] in [string] at or after [start]. */
-Match firstMatchAfter(JSSyntaxRegExp regExp, String string, int start) {
- return regExp._execGlobal(string, start);
-}
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