dartfmt pkg/compiler

pkg/compiler/lib/src/string_validator.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.
 
 // Check the validity of string literals.
 
 library stringvalidator;
 
 import 'dart:collection';
 
 import 'common.dart';
 import 'tokens/token.dart' show Token;
 import 'tree/tree.dart';
 import 'util/characters.dart';
 
 class StringValidator {
   final DiagnosticReporter reporter;
 
   StringValidator(this.reporter);
 
   DartString validateInterpolationPart(Token token, StringQuoting quoting,
-                                       {bool isFirst: false,
-                                        bool isLast: false}) {
+      {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);
+    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.
     if (source.moveNext() && source.current == quoteChar && source.moveNext()) {
       int code = source.current;
-      assert(code == quoteChar);  // If not, there is a bug in the parser.
+      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
@@ skipping 38 matching lines @@
 
   void stringParseError(String message, Token token, int offset) {
     reporter.reportErrorMessage(
         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) {
+  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);
+    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);
+          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);
+              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) {
           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);
+                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);
+              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);
+                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
@@ skipping 16 matching lines @@
       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);
   }
 }