eval and inline expressions

[Johannes]

Hello Forum,

I try to replace a part of a string by using an inline expression and the eval function. I'm not sure, if this should work at all, but when I run the following script:

gpx_metadata = '"<metadata>\n<name>{gpslogger_file}</name></metadata>"';
log(eval(gpx_metadata));

I get this error:

13.12.2014 13:19:27.160 [recordLocation] Action 'Script: log(eval(gpx_metadata));'
ch.gridvision.ppam.androidautomagic.simplelang.a.d: Could not evaluate expression '"<metadata>
<name>{gpslogger_file}</name></metadata>"' due to errors: [Unclosed string[0-11], ';' expected[35], expression expected[35], ';' expected[35], arithmetic additive expression expected[35], arithmetic additive expression expected[41], ';' expected[42], expression expected[42], ';' expected[42], arithmetic additive expression expected[42], Unclosed string[52-53]]
at ch.gridvision.ppam.androidautomagic.simplelang.a.k.a(SourceFile:838)
at ch.gridvision.ppam.androidautomagic.simplelang.a.k.a(SourceFile:808)
at ch.gridvision.ppam.androidautomagic.simplelang.a.c.a(SourceFile:2152)
at ch.gridvision.ppam.androidautomagic.simplelang.a.b.a(SourceFile:659)
at ch.gridvision.ppam.androidautomagic.simplelang.c.ae.b(SourceFile:49)
at ch.gridvision.ppam.androidautomagic.simplelang.c.b.a(SourceFile:40)
at ch.gridvision.ppam.androidautomagic.simplelang.a.b.a(SourceFile:95)
at ch.gridvision.ppam.androidautomagic.simplelang.c.t.b(SourceFile:22)
at ch.gridvision.ppam.androidautomagic.simplelang.a.b.a(SourceFile:656)
at ch.gridvision.ppam.androidautomagic.simplelang.c.ae.b(SourceFile:49)
at ch.gridvision.ppam.androidautomagic.simplelang.c.b.a(SourceFile:40)
at ch.gridvision.ppam.androidautomagic.simplelang.a.b.a(SourceFile:95)
at ch.gridvision.ppam.androidautomagic.simplelang.c.t.b(SourceFile:22)
at ch.gridvision.ppam.androidautomagic.simplelang.a.b.a(SourceFile:675)
at ch.gridvision.ppam.androidautomagic.simplelang.c.v.b(SourceFile:42)
at ch.gridvision.ppam.androidautomagic.simplelang.c.b.a(SourceFile:40)
at ch.gridvision.ppam.androidautomagic.simplelang.a.b.a(SourceFile:102)
at ch.gridvision.ppam.androidautomagic.simplelang.c.ai.b(SourceFile:33)
at ch.gridvision.ppam.androidautomagic.simplelang.a.k.a(SourceFile:827)
at ch.gridvision.ppam.androidautomagic.simplelang.a.k.a(SourceFile:808)
at ch.gridvision.ppam.androidautomagic.d.a.dx$1.d(SourceFile:132)
at ch.gridvision.ppam.androidautomagic.d.a.dx$1.a(SourceFile:121)
at ch.gridvision.ppam.androidautomagic.util.hb$1.run(SourceFile:39)
at java.lang.Thread.run(Thread.java:841)

13.12.2014 13:19:27.174 [recordLocation] End executing action 'Script: log(eval(gpx_metadata));' and exception Could not evaluate expression '"<metadata>
<name>{gpslogger_file}</name></metadata>"' due to errors: [Unclosed string[0-11], ';' expected[35], expression expected[35], ';' expected[35], arithmetic additive expression expected[35], arithmetic additive expression expected[41], ';' expected[42], expression expected[42], ';' expected[42], arithmetic additive expression expected[42], Unclosed string[52-53]]


Obviously metadata is part of an xml file and my intention is to declare some template variables, which will be expanded by real values later on. Hopefully someone can give me a hint what I'm doing wrong.

Best Regards,

Johannes

[kintrupf]

I try to replace a part of a string by using an inline expression and the eval function.

If you want to replace a part of a string, why don't you use the Replace function?

String replace(String s, String search, String replace)
Returns a modified string by replacing all occurrences of search with replace in string s.

[Martin]

Hi,

The single quotes only prevent Automagic from interpreting inline expressions in curly braces but will not prevent the new line (\n) to be applied to the string.
This means that the string '"<metadata>\n<name>{gpslogger_file}</name></metadata>"' will look like this when passed to the eval-function:
"<metadata>
<name>{gpslogger_file}</name></metadata>"

This is not a valid script since the first line opens a string literal but does not close the string literal.

You could either use the replace-function as proposed by kintrupf or use one more backslash to escape the new line: '"<metadata>\\n<name>{gpslogger_file}</name></metadata>"' so that eval sees "<metadata>\n<name>{gpslogger_file}</name></metadata>".

Regards,
Martin