[PLUG] gawk switch statement syntax errors

[Russell Senior]

First off, I don't have your book and have no idea what you are trying to
do.

Second, I think you want NF, not NR.

Thirdly, I think you want to just write matching rules (mawk manpage didn't
mention switch), e.g.:

  NF == 38 { print stuff }
  NR == 37 { print other stuff }

Lastly, if the vertical bars are significant, you should maybe parse on
that character to harmonize the input to a subsequent stage ... but that's
just a guess, since I don't know wtf you are doing.

On Mon, Jul 23, 2018 at 11:02 AM, Rich Shepard <rshepard at appl-ecosys.com>
wrote:

>   gawk-4.1.3 is installed here. According to Arnold Robbins' 'Effective awk
> Programming, 4th Ed',  page 154, the syntax for the switch statement is
> used
> in this code:
>
> # Get line length (number of fields)
> switch (NR) {
> case 36: # No shifts present.
>     { print $1, $6, $7, $8, $9, $10, $11, $12, $13, $18, $19, $20, $21,
> $22, $23, $24, $25, $29, $30, $31, $32, $33, $34, $35, $36 }
>     break
> case 37: # 1 shift present.
>     { print $1, $6, $7, $8, $9, $10, $11, $12, $13, $19, $20, $21, $22,
> $23, $24, $25, $26, $30, $31, $32, $33, $34, $35, $36, $37 }
>     break
> case 38: # 2 shifts present.
>     { print $1, $7, $8, $9, $10, $11, $12, $13, $14, $20, $21, $22, $23,
> $24, $25, $26, $27, $31, $32, $33, $34, $35, $36, $37, $38 }
>     break
> case ?:
>     break
> }
>
>   Running this code on data results in syntax errors:
>
> $ gawk -f trim-fields.awk test.dat > out
> gawk: trim-fields.awk:13: switch (NR) {
> gawk: trim-fields.awk:13: ^ syntax error
> gawk: trim-fields.awk:14: case 36: # No shifts present.
> gawk: trim-fields.awk:14: ^ syntax error
> gawk: trim-fields.awk:17: case 37: # 1 shift present.
> gawk: trim-fields.awk:17: ^ syntax error
> gawk: trim-fields.awk:20: case 38: # 2 shifts present.
> gawk: trim-fields.awk:20: ^ syntax error
> gawk: trim-fields.awk:23: case ?:
> gawk: trim-fields.awk:23: ^ syntax error
>
>   I'm sure it's a simple error on my part but I'm just not seeing the
> problem.
>
>   Test data set (test.dat) has lines with each length:
>
> 11/24/07 0400 12.12 |0400 2090 0.01| 12.10 12.10 12.04 12.08 12.12 12.12
> 12.10 12.06 1200 12.00 |1200 1930 0.01| 12.08 12.06 12.07 12.04 12.00 12.04
> 12.03 12.03 12.05 | 2000 2000 | 12.03 12.06 12.04 12.01 12.00 12.02 12.00
> 12.01
> 11/25/07 0000 12.01 |0000 1950 0.01| 12.01 12.01 11.99 11.97 11.97 11.98
> 11.96 11.96 2400 11.87 |2400 1770 0.00| 11.97 11.95 11.95 11.95 11.93 11.91
> 11.93 11.93 11.95 | 1860 1860 | 11.96 11.97 11.93 11.93 11.91 11.89 11.89
> 11.90
> 11/26/07 1830 11.97 |1830 1890 | 11.87 11.87 11.90 11.90 11.89 11.86 11.87
> 11.81 0800 11.78 |0800 1680 0.00| 11.78 11.88 11.86 11.79 11.81 11.89 11.81
> 11.82 11.87 | 1770 1770 | 11.80 11.79 11.92 11.92 11.94 11.92 11.95 11.93
> 11/27/07 0230 12.05 |0230 1990 | 11.94 11.99 12.04 12.04 12.04 12.04 12.04
> 12.03 2230 11.93 |2230 1840 | 12.03 12.02 12.02 11.98 11.95 11.97 11.96
> 11.95 11.98 | 1900 1900 | 11.94 11.94 11.94 11.96 11.97 11.97 11.94 11.93
> 11/28/07 2000 12.02 |2000 1950 | 11.94 11.92 11.91 11.92 11.90 11.88 11.88
> 11.86 1430 11.81 |1430 1710 | 11.85 11.85 11.86 11.86 11.85 11.82 11.82
> 11.83 11.89 | 1790 1790 | 11.86 11.86 11.87 11.90 12.02 12.00 11.90 11.91
>
>   I'm stuck (again) and I don't think this is a white space issue or an
> improper newline placement.
>
> Rich
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