sdk files reorganization to make dart2js a proper package

sdk/lib/_internal/compiler/js_lib/string_helper.dart

-// 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;
-
-stringIndexOfStringUnchecked(receiver, other, startIndex) {
-  return JS('int', '#.indexOf(#, #)', receiver, other, startIndex);
-}
-
-substring1Unchecked(receiver, startIndex) {
-  return JS('String', '#.substring(#)', receiver, startIndex);
-}
-
-substring2Unchecked(receiver, startIndex, endIndex) {
-  return JS('String', '#.substring(#, #)', receiver, startIndex, endIndex);
-}
-
-stringContainsStringUnchecked(receiver, other, startIndex) {
-  return stringIndexOfStringUnchecked(receiver, other, startIndex) >= 0;
-}
-
-class StringMatch implements Match {
-  const StringMatch(int this.start,
-                    String this.input,
-                    String this.pattern);
-
-  int get end => start + pattern.length;
-  String operator[](int g) => group(g);
-  int get groupCount => 0;
-
-  String group(int group_) {
-    if (group_ != 0) {
-      throw new RangeError.value(group_);
-    }
-    return pattern;
-  }
-
-  List<String> groups(List<int> groups_) {
-    List<String> result = new List<String>();
-    for (int g in groups_) {
-      result.add(group(g));
-    }
-    return result;
-  }
-
-  final int start;
-  final String input;
-  final String pattern;
-}
-
-List<Match> allMatchesInStringUnchecked(String pattern, String string,
-                                        int startIndex) {
-  // Copied from StringBase.allMatches in
-  // /runtime/lib/string_base.dart
-  List<Match> result = new List<Match>();
-  int length = string.length;
-  int patternLength = pattern.length;
-  while (true) {
-    int position = stringIndexOfStringUnchecked(string, pattern, startIndex);
-    if (position == -1) {
-      break;
-    }
-    result.add(new StringMatch(position, string, pattern));
-    int endIndex = position + patternLength;
-    if (endIndex == length) {
-      break;
-    } else if (position == endIndex) {
-      ++startIndex;  // empty match, advance and restart
-    } else {
-      startIndex = endIndex;
-    }
-  }
-  return result;
-}
-
-stringContainsUnchecked(receiver, other, startIndex) {
-  if (other is String) {
-    return stringContainsStringUnchecked(receiver, other, startIndex);
-  } else if (other is JSSyntaxRegExp) {
-    return other.hasMatch(receiver.substring(startIndex));
-  } else {
-    var substr = receiver.substring(startIndex);
-    return other.allMatches(substr).isNotEmpty;
-  }
-}
-
-stringReplaceJS(receiver, replacer, replacement) {
-  // The JavaScript String.replace method recognizes replacement
-  // patterns in the replacement string. Dart does not have that
-  // behavior.
-  replacement = JS('String', r'#.replace(/\$/g, "$$$$")', replacement);
-  return JS('String', r'#.replace(#, #)', receiver, replacer, replacement);
-}
-
-stringReplaceFirstRE(receiver, regexp, replacement, startIndex) {
-  var match = regexp._execGlobal(receiver, startIndex);
-  if (match == null) return receiver;
-  var start = match.start;
-  var end = match.end;
-  return stringReplaceRangeUnchecked(receiver, start, end, replacement);
-}
-
-const String ESCAPE_REGEXP = r'[[\]{}()*+?.\\^$|]';
-
-stringReplaceAllUnchecked(receiver, pattern, replacement) {
-  checkString(replacement);
-  if (pattern is String) {
-    if (pattern == "") {
-      if (receiver == "") {
-        return replacement;
-      } else {
-        StringBuffer result = new StringBuffer();
-        int length = receiver.length;
-        result.write(replacement);
-        for (int i = 0; i < length; i++) {
-          result.write(receiver[i]);
-          result.write(replacement);
-        }
-        return result.toString();
-      }
-    } else {
-      var quoter = JS('', "new RegExp(#, 'g')", ESCAPE_REGEXP);
-      var quoted = JS('String', r'#.replace(#, "\\$&")', pattern, quoter);
-      var replacer = JS('', "new RegExp(#, 'g')", quoted);
-      return stringReplaceJS(receiver, replacer, replacement);
-    }
-  } else if (pattern is JSSyntaxRegExp) {
-    var re = regExpGetGlobalNative(pattern);
-    return stringReplaceJS(receiver, re, replacement);
-  } else {
-    checkNull(pattern);
-    // TODO(floitsch): implement generic String.replace (with patterns).
-    throw "String.replaceAll(Pattern) UNIMPLEMENTED";
-  }
-}
-
-String _matchString(Match match) => match[0];
-String _stringIdentity(String string) => string;
-
-stringReplaceAllFuncUnchecked(receiver, pattern, onMatch, onNonMatch) {
-  if (onMatch == null) onMatch = _matchString;
-  if (onNonMatch == null) onNonMatch = _stringIdentity;
-  if (pattern is String) {
-    return stringReplaceAllStringFuncUnchecked(receiver, pattern,
-                                               onMatch, onNonMatch);
-  }
-  // Placing the Pattern test here is indistingishable from placing it at the
-  // top of the method but it saves an extra check on the `pattern is String`
-  // path.
-  if (pattern is! Pattern) {
-    throw new ArgumentError.value(pattern, 'pattern', 'is not a Pattern');
-  }
-  StringBuffer buffer = new StringBuffer();
-  int startIndex = 0;
-  for (Match match in pattern.allMatches(receiver)) {
-    buffer.write(onNonMatch(receiver.substring(startIndex, match.start)));
-    buffer.write(onMatch(match));
-    startIndex = match.end;
-  }
-  buffer.write(onNonMatch(receiver.substring(startIndex)));
-  return buffer.toString();
-}
-
-stringReplaceAllEmptyFuncUnchecked(receiver, onMatch, onNonMatch) {
-  // Pattern is the empty string.
-  StringBuffer buffer = new StringBuffer();
-  int length = receiver.length;
-  int i = 0;
-  buffer.write(onNonMatch(""));
-  while (i < length) {
-    buffer.write(onMatch(new StringMatch(i, receiver, "")));
-    // Special case to avoid splitting a surrogate pair.
-    int code = receiver.codeUnitAt(i);
-    if ((code & ~0x3FF) == 0xD800 && length > i + 1) {
-      // Leading surrogate;
-      code = receiver.codeUnitAt(i + 1);
-      if ((code & ~0x3FF) == 0xDC00) {
-        // Matching trailing surrogate.
-        buffer.write(onNonMatch(receiver.substring(i, i + 2)));
-        i += 2;
-        continue;
-      }
-    }
-    buffer.write(onNonMatch(receiver[i]));
-    i++;
-  }
-  buffer.write(onMatch(new StringMatch(i, receiver, "")));
-  buffer.write(onNonMatch(""));
-  return buffer.toString();
-}
-
-stringReplaceAllStringFuncUnchecked(receiver, pattern, onMatch, onNonMatch) {
-  int patternLength = pattern.length;
-  if (patternLength == 0) {
-    return stringReplaceAllEmptyFuncUnchecked(receiver, onMatch, onNonMatch);
-  }
-  int length = receiver.length;
-  StringBuffer buffer = new StringBuffer();
-  int startIndex = 0;
-  while (startIndex < length) {
-    int position = stringIndexOfStringUnchecked(receiver, pattern, startIndex);
-    if (position == -1) {
-      break;
-    }
-    buffer.write(onNonMatch(receiver.substring(startIndex, position)));
-    buffer.write(onMatch(new StringMatch(position, receiver, pattern)));
-    startIndex = position + patternLength;
-  }
-  buffer.write(onNonMatch(receiver.substring(startIndex)));
-  return buffer.toString();
-}
-
-
-stringReplaceFirstUnchecked(receiver, pattern, replacement, int startIndex) {
-  if (pattern is String) {
-    int index = stringIndexOfStringUnchecked(receiver, pattern, startIndex);
-    if (index < 0) return receiver;
-    int end = index + pattern.length;
-    return stringReplaceRangeUnchecked(receiver, index, end, replacement);
-  }
-  if (pattern is JSSyntaxRegExp) {
-    return startIndex == 0
-        ? stringReplaceJS(receiver, regExpGetNative(pattern), replacement)
-        : stringReplaceFirstRE(receiver, pattern, replacement, startIndex);
-  }
-  checkNull(pattern);
-  Iterator<Match> matches = pattern.allMatches(receiver, startIndex).iterator;
-  if (!matches.moveNext()) return receiver;
-  Match match = matches.current;
-  return receiver.replaceRange(match.start, match.end, replacement);
-}
-
-stringReplaceFirstMappedUnchecked(receiver, pattern, replace,
-                                  int startIndex) {
-  Iterator<Match> matches = pattern.allMatches(receiver, startIndex).iterator;
-  if (!matches.moveNext()) return receiver;
-  Match match = matches.current;
-  String replacement = "${replace(match)}";
-  return receiver.replaceRange(match.start, match.end, replacement);
-}
-
-stringJoinUnchecked(array, separator) {
-  return JS('String', r'#.join(#)', array, separator);
-}
-
-String stringReplaceRangeUnchecked(String receiver,
-                                   int start, int end, String replacement) {
-  var prefix = JS('String', '#.substring(0, #)', receiver, start);
-  var suffix = JS('String', '#.substring(#)', receiver, end);
-  return "$prefix$replacement$suffix";
-}