Revert "Move dart2js from sdk/lib/_internal/compiler to pkg/compiler"

pkg/compiler/lib/src/string_validator.dart

Index: pkg/compiler/lib/src/string_validator.dart
diff --git a/pkg/compiler/lib/src/string_validator.dart b/pkg/compiler/lib/src/string_validator.dart
deleted file mode 100644
index d967e44799ccca757a2ae93acca71b2888500869..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/string_validator.dart
+++ /dev/null
@@ -1,235 +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.
-
-// Check the validity of string literals.
-
-library stringvalidator;
-
-import "dart:collection";
-
-import "dart2jslib.dart";
-import "tree/tree.dart";
-import "util/characters.dart";
-import "scanner/scannerlib.dart" show Token;
-
-class StringValidator {
-  final DiagnosticListener listener;
-
-  StringValidator(this.listener);
-
-  DartString validateInterpolationPart(Token token, StringQuoting quoting,
-                                       {bool isFirst: false,
-                                        bool isLast: false}) {
-    String source = token.value;
-    int leftQuote = 0;
-    int rightQuote = 0;
-    if (isFirst) leftQuote = quoting.leftQuoteLength;
-    if (isLast) rightQuote = quoting.rightQuoteLength;
-    String content = copyWithoutQuotes(source, leftQuote, rightQuote);
-    return validateString(token,
-                          token.charOffset + leftQuote,
-                          content,
-                          quoting);
-  }
-
-  static StringQuoting quotingFromString(String sourceString) {
-    Iterator<int> source = sourceString.codeUnits.iterator;
-    bool raw = false;
-    int leftQuoteLength = 1;
-    source.moveNext();
-    int quoteChar = source.current;
-    if (quoteChar == $r) {
-      raw = true;
-      source.moveNext();
-      quoteChar = source.current;
-    }
-    assert(quoteChar == $SQ || quoteChar == $DQ);
-    // String has at least one quote. Check it if has three.
-    // If it only has two, the string must be an empty string literal,
-    // and end after the second quote.
-    bool multiline = false;
-    if (source.moveNext() && source.current == quoteChar && source.moveNext()) {
-      int code = source.current;
-      assert(code == quoteChar);  // If not, there is a bug in the parser.
-      leftQuoteLength = 3;
-
-      // Check if a multiline string starts with optional whitespace followed by
-      // a newline (CR, LF or CR+LF).
-      // We also accept if the these characters are escaped by a backslash.
-      int newLineLength = 1;
-      while (true) {
-        // Due to string-interpolations we are not guaranteed to see the
-        // trailing quoting characters. The invocations to `moveNext()` may
-        // therefore return false and the `current`-getter return `null`. The
-        // code does not need to handle this specially (as it will not find the
-        // newline characters).
-        source.moveNext();
-        code = source.current;
-        if (code == $BACKSLASH) {
-          newLineLength++;
-          source.moveNext();
-          code = source.current;
-        }
-        if (code == $TAB || code == $SPACE) {
-          newLineLength++;
-          continue;
-        }
-        if (code == $CR) {
-          if (source.moveNext() && source.current == $LF) {
-            newLineLength++;
-          }
-          leftQuoteLength += newLineLength;
-        } else if (code == $LF) {
-          leftQuoteLength += newLineLength;
-        }
-        break;
-      }
-    }
-    return StringQuoting.getQuoting(quoteChar, raw, leftQuoteLength);
-  }
-
-  /**
-   * Return the string [string] witout its [initial] first and [terminal] last
-   * characters. This is intended to be used to remove quotes from string
-   * literals (including an initial 'r' for raw strings).
-   */
-  String copyWithoutQuotes(String string, int initial, int terminal) {
-    assert(0 <= initial);
-    assert(0 <= terminal);
-    assert(initial + terminal <= string.length);
-    return string.substring(initial, string.length - terminal);
-  }
-
-  void stringParseError(String message, Token token, int offset) {
-    listener.reportFatalError(
-        token, MessageKind.GENERIC, {'text': "$message @ $offset"});
-  }
-
-  /**
-   * Validates the escape sequences and special characters of a string literal.
-   * Returns a DartString if valid, and null if not.
-   */
-  DartString validateString(Token token,
-                            int startOffset,
-                            String string,
-                            StringQuoting quoting) {
-    // We need to check for invalid x and u escapes, for line
-    // terminators in non-multiline strings, and for invalid Unicode
-    // scalar values (either directly or as u-escape values).  We also check
-    // for unpaired UTF-16 surrogates.
-    int length = 0;
-    int index = startOffset;
-    bool containsEscape = false;
-    bool previousWasLeadSurrogate = false;
-    bool invalidUtf16 = false;
-    var stringIter = string.codeUnits.iterator;
-    for(HasNextIterator<int> iter = new HasNextIterator(stringIter);
-        iter.hasNext;
-        length++) {
-      index++;
-      int code = iter.next();
-      if (code == $BACKSLASH) {
-        if (quoting.raw) continue;
-        containsEscape = true;
-        if (!iter.hasNext) {
-          stringParseError("Incomplete escape sequence",token, index);
-          return null;
-        }
-        index++;
-        code = iter.next();
-        if (code == $x) {
-          for (int i = 0; i < 2; i++) {
-            if (!iter.hasNext) {
-              stringParseError("Incomplete escape sequence", token, index);
-              return null;
-            }
-            index++;
-            code = iter.next();
-            if (!isHexDigit(code)) {
-              stringParseError("Invalid character in escape sequence",
-                               token, index);
-              return null;
-            }
-          }
-          // A two-byte hex escape can't generate an invalid value.
-          continue;
-        } else if (code == $u) {
-          int escapeStart = index - 1;
-          index++;
-          code = iter.hasNext ? iter.next() : 0;
-          int value = 0;
-          if (code == $OPEN_CURLY_BRACKET) {
-            // expect 1-6 hex digits.
-            int count = 0;
-            while (iter.hasNext) {
-              code = iter.next();
-              index++;
-              if (code == $CLOSE_CURLY_BRACKET) {
-                break;
-              }
-              if (!isHexDigit(code)) {
-                stringParseError("Invalid character in escape sequence",
-                                 token, index);
-                return null;
-              }
-              count++;
-              value = value * 16 + hexDigitValue(code);
-            }
-            if (code != $CLOSE_CURLY_BRACKET || count == 0 || count > 6) {
-              int errorPosition = index - count;
-              if (count > 6) errorPosition += 6;
-              stringParseError("Invalid character in escape sequence",
-                               token, errorPosition);
-              return null;
-            }
-          } else {
-            // Expect four hex digits, including the one just read.
-            for (int i = 0; i < 4; i++) {
-              if (i > 0) {
-                if (iter.hasNext) {
-                  index++;
-                  code = iter.next();
-                } else {
-                  code = 0;
-                }
-              }
-              if (!isHexDigit(code)) {
-                stringParseError("Invalid character in escape sequence",
-                                 token, index);
-                return null;
-              }
-              value = value * 16 + hexDigitValue(code);
-            }
-          }
-          code = value;
-        }
-      }
-      if (code >= 0x10000) length++;
-      // This handles both unescaped characters and the value of unicode
-      // escapes.
-      if (previousWasLeadSurrogate) {
-        if (!isUtf16TrailSurrogate(code)) {
-          invalidUtf16 = true;
-          break;
-        }
-        previousWasLeadSurrogate = false;
-      } else if (isUtf16LeadSurrogate(code)) {
-        previousWasLeadSurrogate = true;
-      } else if (!isUnicodeScalarValue(code)) {
-        invalidUtf16 = true;
-        break;
-      }
-    }
-    if (previousWasLeadSurrogate || invalidUtf16) {
-      stringParseError("Invalid Utf16 surrogate", token, index);
-      return null;
-    }
-    // String literal successfully validated.
-    if (quoting.raw || !containsEscape) {
-      // A string without escapes could just as well have been raw.
-      return new DartString.rawString(string, length);
-    }
-    return new DartString.escapedString(string, length);
-  }
-}