Recent changes to bugs

#6 Nonstandard Getline behavior

Peter — Fri, 16 Aug 2013 09:13:10 -0000

I have a fix resolving the issue. How can I contribute to the source?

#4 Escaped '/' in regexp throws exception

Terrot Francois — Thu, 06 Jun 2013 15:44:25 -0000

Hi
I have also experimented this issue.
Please find here after the description of the "ugly" patch I did on my side:
In readRegexp() from AwkParser.java I just add a check to make sure an escaped / is taken into account (lines FIXME: are the one I added)

private void readRegexp()
   throws IOException {

// should only contain nothing or =, depending on whether
// starting with /... or /=...
assert regexp.length()==0 || regexp.length()==1;
while(c >= 0 && c != '/' && c != '\n') {
    /* FIXME:Just to be able to to include / in the pattern 
     * FIXME:In case of \ force to read the one character more:
     * FIXME:- if second is not /, append the two characters to regexp buffer
     * FIXME:- if a / is read, only the / is append. */
    if (c== '\\') {                          /* FIXME: */
        c = reader.read();               /* FIXME: */
        if (c!='/') regexp.append('\\'); /* FIXME: */
    }                                        /* FIXME: */
    regexp.append((char)c);
    c = reader.read();
    // completely bypass \r's
    while(c == '\r') c = reader.read();
}
if (c < 0 || c == '\n')
    throw new LexerException("Unterminated regular expression: "+regexp);
c = reader.read();
// completely bypass \r's
while(c == '\r') c = reader.read();
  }

Awk Error Not Reported (& Caught)

aplatypus — Tue, 16 Apr 2013 11:57:56 -0000

Hi ...

The problem is that the jawk interpreter fails on the attached script -- The script is a mess with cut-n-pastes from old scripts to build a new script.

Jawk just crashes. The same script runs to completion with gnu gawk (latest version). and the code itself is quite old. So if there's a typo, etc gawk should catch it too.

Stack dump:

org.jawk.frontend.AwkParser$AST$SemanticException: function org.jawk.frontend.AwkParser$FunctionProxy@57102fab (RESET) not defined (line: 449)
at org.jawk.frontend.AwkParser$FunctionCall_AST.semanticAnalysis(AwkParser.java:3016)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1844)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1844)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1844)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.frontend.AwkParser$AST.semanticAnalysis(AwkParser.java:1845)
at org.jawk.Awk.invoke(Awk.java:164)
at org.jawk.Awk.main(Awk.java:105)

Nonstandard Getline behavior

yanlend — Sat, 16 Feb 2013 12:40:55 -0000

getline function changes variables that it should not according to http://www.gnu.org/software/gawk/manual/html_node/Getline-Summary.html#Getline-Summary
I used the function in the form
command | getline var
but at least FILENAME and NF were changed. For my application of the type
/pattern/ {
cmd = "wget -t 1 -nv " $1 " 2>&1"
while ( (cmd | getline line) > 0 )
result = result " " line
close(cmd)
}
it had the consequence of stopping the awk script after processing one line of the input file instead of processing each line. The script works correctly with Gawk.

Bracket not taken into account in math expression

Anonymous — Tue, 18 Nov 2008 23:00:49 -0000

The mathematic expression:

a=(i-j)/(k*m)

with i=206
j=6
k=7
m=2

gives 57.1429 but it should be 14.2857

Bracket are not taken into account for operation priority.

Thanks

millette_jocelyn@hotmail.com

Escaped '/' in regexp throws exception

Anonymous — Wed, 16 Jan 2008 14:33:38 -0000

To match a '/' in a regexp in AWK you have to escape it as follows:
\/

But doing so causes Jawk to throw an exception.

eg the following AWK script (which is looking for /cgi):

/\/cgi/ { print }

causes this:

Exception in thread "main" org.jawk.frontend.AwkParser$ParserException: Expecting an ID. Got (299): { (line 0)
at org.jawk.frontend.AwkParser.SYMBOL(AwkParser.java:1173)
at org.jawk.frontend.AwkParser.FACTOR(AwkParser.java:1097)
at org.jawk.frontend.AwkParser.FACTOR_FOR_INCDEC(AwkParser.java:1016)
at org.jawk.frontend.AwkParser.FACTOR_FOR_IN(AwkParser.java:983)
at org.jawk.frontend.AwkParser.FACTOR_FOR_GETLINE(AwkParser.java:967)
at org.jawk.frontend.AwkParser.TERM(AwkParser.java:939)
at org.jawk.frontend.AwkParser.TERM(AwkParser.java:947)
at org.jawk.frontend.AwkParser.EXPRESSION(AwkParser.java:871)
at org.jawk.frontend.AwkParser.COMPARISON_EXPRESSION(AwkParser.java:853)
at org.jawk.frontend.AwkParser.LE2_EXPRESSION(AwkParser.java:833)
at org.jawk.frontend.AwkParser.LE1_EXPRESSION(AwkParser.java:816)
at org.jawk.frontend.AwkParser.TERTIARY_EXPRESSION(AwkParser.java:802)
at org.jawk.frontend.AwkParser.CONCAT_EXPRESSION(AwkParser.java:785)
at org.jawk.frontend.AwkParser.CONCAT_EXPRESSION(AwkParser.java:788)
at org.jawk.frontend.AwkParser.COMMA_EXPRESSION(AwkParser.java:768)
at org.jawk.frontend.AwkParser.ASSIGNMENT_EXPRESSION(AwkParser.java:749)
at org.jawk.frontend.AwkParser.RULE(AwkParser.java:683)
at org.jawk.frontend.AwkParser.RULE_LIST(AwkParser.java:615)
at org.jawk.frontend.AwkParser.SCRIPT(AwkParser.java:599)
at org.jawk.frontend.AwkParser.parse(AwkParser.java:237)
at org.jawk.Awk.invoke(Awk.java:114)
at org.jawk.Awk.main(Awk.java:83)

Regards,

Stephen Summerfield
stephen@netality.com

umberFormatException

Camilo Vasquez — Fri, 06 Jul 2007 23:51:46 -0000

NumberFormatException thrown in file AwkParser, line 3719, Class AwkSymbolTable:

AST addINTEGER(String integer) { return new Integer_AST(Integer.decode(integer)); }

The value of the integer String is "09", causing Integer.decode to interpret it as octal.

I supose the correct line must be:

AST addINTEGER(String integer) { return new Integer_AST(Integer.parseInt(integer)); }

mail cvasquez2@hotmail.com

Number Format Exeption

Anonymous — Fri, 06 Jul 2007 23:44:24 -0000

NumberFromatException thrown in file AwkParser, line 3719, Class AwkSymbolTable:

AST addINTEGER(String integer) { return new Integer_AST(Integer.decode(integer)); }

The value of the integer String is "09", causing Integer.decode to interpret it as octal.

I supose the correct line must be:

AST addINTEGER(String integer) { return new Integer_AST(Integer.parseInt(integer)); }

Problem with \r, \n, \t characters in strings.

ddaglas — Tue, 28 Feb 2006 12:08:17 -0000

The interpreter processes \r, \n, and \t in strings as
regular r, n, and t characters, respectively. A
workaround is to use character types:

Instead of "Hello there\n", use "Hello there" '\n'.