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  1. JDK
  2. JDK-4163964

line terminator written with Unicode escapes

    Details

    • Subcomponent:
    • CPU:
      x86, sparc
    • OS:
      solaris_2.5.1, windows_nt

      Description



      Name: laC46010 Date: 08/06/98



      All javac versions (jdk1.0.2-jdk1.2fcsD) incorrectly report an error
      on \u000D\u000A sequence in source file. However JLS p.13-14 explicitely
      allows to use CR LF sequence as a line terminator:

      "3.4 Line Terminators

      Java implementations next divide the sequence of Unicode input
      characters into lines by recognizing line terminators. This definition
      of lines determines the line numbers produced by a Java compiler or
      other Java system component. It also specifies the termination of the
      // form of a comment (3.7).

      LineTerminator:
      the ASCII LF character, also known as "newline"
      the ASCII CR character, also known as "return"
      the ASCII CR character followed by the ASCII LF character

      InputCharacter:
      UnicodeInputCharacter but not CR or LF

      Lines are terminated by the ASCII characters CR, or LF, or CR LF. The
      two characters CR immediately followed by LF are counted as one line
      terminator, not two. The result is a sequence of line terminators and
      input characters, which are the terminal symbols for the third step in
      the tokenization process."

      As result of this bug, JDK fails the following JCK12beta4 test case:

      lang/LEX/lex005/lex00591m4/lex00591m4.html

      Note that fix of #4112770 has allowed to use single \u000D and \u000A as line separators
      but the third case (\u000D\u000A) is not implemented yet.

      See source and logs below.

      ------------------lex00591m4.java---------------------
      /* Ident: @(#)lex00591m4.java generated from: @(#)lex00591m.jmpp 1.5 98/04/28 */
      /* Copyright 8/3/98 Sun Microsystems, Inc. All Rights Reserved */

      package javasoft.sqe.tests.lang.lex005.lex00591m4;

      import java.io.PrintStream;
        
      public class lex00591m4 {
      public static void main(String argv[]) {
      System.exit(run(argv, System.out) + 95/*STATUS_TEMP*/);
      }

      public static int run(String argv[],PrintStream out) {
      /*--- Line terminator `the ASCII CR character followed by the ASCII LF character` as Unicode-escape. ---*/
      int a; \u000D\u000A
      return 0/*STATUS_PASSED*/;
      }
      }
      ------------------------------------------------------

      > /export/ld14/java/dest/jdk1.2fcsD/solaris/bin/javac -d /tmp lex00591m4.java
      lex00591m4.java:16: Invalid expression statement.
      int a; \u000D\u000A
      ^
      lex00591m4.java:16: ';' expected.
      int a; \u000D\u000A
      ^
      2 errors

      > /export/ld14/java/dest/jdk1.1.7A/solaris/bin/javac -d /tmp lex00591m4.java
      lex00591m4.java:15: Invalid character in input.
      int a; \u000D\u000A
      ^
      1 error

      > /export/ld14/java/dest/jdk1.1/solaris/bin/javac -d /tmp lex00591m4.java
      lex00591m4.java:15: Invalid character in input.
      int a; \u000D\u000A
      ^
      1 error

      > /export/ld14/java/dest/jdk1.0.2/solaris/bin/javac -d /tmp lex00591m4.java
      lex00591m4.java:15: Invalid character in input.
      int a; \u000D\u000A
      ^
      1 error


      ======================================================================

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            • Assignee:
              iris Iris Clark
              Reporter:
              leosunw Leo Leo (Inactive)
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                Updated:
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