The backslash behaviour is somehow unpredictable with the current
parser. But you can use the "poor man's escaping":
#set($dol='$')
$dol{FOO:?Foo is not set}
Claude
Le mercredi 13 février 2008 à 20:34 -0800, Bryan Castillo a écrit :
> I am trying to generate some shell scripts with a parameter expansion
> of the the form ${parameter:?word}.
>
> For a test case, I tried to get Velocity to generate a String with the
> content:
>
> ${FOO:?Foo is not set}
>
>
> I tried the following templates:
>
> ${FOO:?Foo is not set} -> Produces an exception.
> \${FOO:?Foo is not set} -> Also produces an exception.
> $\{FOO:?Foo is not set} -> Produces: $\{FOO:?Foo is not
> set} (Why is the backslash still there?)
>
>
>
> When I run the template \$FOO I still get the output \$FOO. I
> thought that I would get $FOO.
>
>
>
> If anyone could help me out with this, I would appreciate it.
> Thanks.
>
>
> Test Code:
>
>
>
> package com.amazonaws.mturk.build;
>
> import java.io.StringWriter;
>
> import org.apache.velocity.VelocityContext;
> import org.apache.velocity.app.VelocityEngine;
>
>
> public class TestVelocityShellConstruct {
>
> public static void main(String[] args) {
> String[] templates = new String[] {
> "${FOO:?Foo is not set}",
> "\\${FOO:?Foo is not set}",
> "$\\{FOO:?Foo is not set}"
> };
> String expected = "${FOO:?Foo is not set}";
>
> VelocityEngine engine = new VelocityEngine();
> for (String template : templates) {
>
> System.out.println("-----------------------------------------------");
> System.out.println("Executing template:");
> System.out.println("-------------------");
> System.out.println(template);
> System.out.println();
> System.out.println("Output:");
> System.out.println("-------");
> try {
> StringWriter out = new StringWriter();
> engine.evaluate(new VelocityContext(), out,
> "velocity", template);
> System.out.println(out);
> if (!expected.equals(out.toString())) {
> System.out.println("DOES NOT MATCH EXPECTED OUTPUT.");
> }
> }
> catch (Exception e) {
> e.printStackTrace(System.out);
> }
> }
>
> }
>
> }
>
>
>
> Output:
>
>
>
> -----------------------------------------------
> Executing template:
> -------------------
> ${FOO:?Foo is not set}
>
> Output:
> -------
> org.apache.velocity.exception.ParseErrorException: Encountered ":?Foo
> is not set}" at line 1, column 6 of velocity
> Was expecting one of:
> "}" ...
> <DOT> ...
>
> at
> org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:311)
> at
> org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:228)
> at
> com.amazonaws.mturk.build.TestVelocityShellConstruct.main(TestVelocityShellConstruct.java:30)
> -----------------------------------------------
> Executing template:
> -------------------
> \${FOO:?Foo is not set}
>
> Output:
> -------
> org.apache.velocity.exception.ParseErrorException: Encountered ":?Foo
> is not set}" at line 1, column 7 of velocity
> Was expecting one of:
> "}" ...
> <DOT> ...
>
> at
> org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:311)
> at
> org.apache.velocity.app.VelocityEngine.evaluate(VelocityEngine.java:228)
> at
> com.amazonaws.mturk.build.TestVelocityShellConstruct.main(TestVelocityShellConstruct.java:30)
> -----------------------------------------------
> Executing template:
> -------------------
> $\{FOO:?Foo is not set}
>
> Output:
> -------
> $\{FOO:?Foo is not set}
> DOES NOT MATCH EXPECTED OUTPUT.
>
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