I'm using MarkupBuilder to render some HTML from a taglib like so (stripped down for clarity):
def formContainer = new MarkupBuilder(out)
formConainer.form() {
input() { }
input() { }
}
Now assume that somewhere inside the form() I want to pull in some elements specified by a user so in a file on the file system I have something like this (again, simplified)...
select() {
option()
option()
}
My question is, if I read that select in as a String, is there a way for the taglib to parse it as groovy and make it part of the MarkupBuilder instance?
def formContainer = new MarkupBuilder(out)
formConainer.form() {
input() { }
input() { }
// I want the select to render here
}
One method for doing this would be:
String externalMarkup = '''
select() {
option()
option()
}
'''
def out = new StringWriter()
def formContainer = new groovy.xml.MarkupBuilder( out )
formContainer.form() {
input()
input()
// Wrap the string in { -> ... } to make it a closure, and evaluate it
def extern = new GroovyShell().evaluate( "{ it-> ${externalMarkup} }" )
// Set the delegate of this closure to the MarkupWriter
extern.delegate = formContainer
// Then execute the closure
extern()
}
println out.toString()
However, this feels brittle to me...
A better method might be to use the GroovyTemplateEngine to inject your values into a formatted complete bit of markup
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