I figured it out. although functions (methods) cannot be defined, a
closure works fine:
def text = """\ <% def now = java.time.LocalDate.now() def dayName = {
theDate -> return
theDate.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault()) } %> # Hello Today (<%= dayName(now) %>)
is <%= now %>. The weather in next 3 days will be: <% def weather = [
"Sunny", "Rainy", "Cloudy", "Windy" ] for (i = 1; i < 4; i++) { def day
= now.plusDays(i) Collections.shuffle weather out.println "- " +
dayName(day) + ": " + weather.first() } %> """.stripIndent() def engine = new StreamingTemplateEngine() def template =
engine.createTemplate(text) println template.make()
On 7/23/22 19:59, Per Nyfelt wrote:
Hi,
I am trying to use the StreamingTemplateEngine to create dynamic
markdown (similarly to the rmd (r markdown,
https://rmarkdown.rstudio.com/authoring_quick_tour.html) but I've
encountered a snag:
Simple usage such as the following works fine using the
StreamingTemplateEngine:
def text = """\ <% def now = java.time.LocalDate.now() %> # Hello
Today (<%=
now.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault()) %>) is <%= java.time.LocalDate.now()
%>. The weather in next 3 days will be: <% def weather = [ "Sunny",
"Rainy", "Cloudy", "Windy" ] for (i = 1; i < 4; i++) { def day =
now.plusDays(i) def dayName =
day.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault()) Collections.shuffle weather out.println
"- " + dayName + ": " + weather.first() } %> """.stripIndent() def engine = new StreamingTemplateEngine() def template
= engine.createTemplate(text) println template.make()
But if if want to define a function to simplify the code e.g.
def text = """\ <% def now = java.time.LocalDate.now() def
dayName(java.time.LocalDate theDate) { return
theDate.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault()) } %> # Hello Today (<%= dayName(now)
%>) is <%= now %>. The weather in next 3 days will be: <% def weather
= [ "Sunny", "Rainy", "Cloudy", "Windy" ] for (i = 1; i < 4; i++) {
def day = now.plusDays(i) Collections.shuffle weather out.println "- "
+ dayName(day) + ": " + weather.first() } %> """.stripIndent() def engine = new StreamingTemplateEngine() def template
= engine.createTemplate(text) println template.make()
...the StreamingTemplateEngine does not accept the function definition:
Template parse error 'Unexpected input: '(' ' at line 4, column 12
3:
--> 4: def dayName(java.time.LocalDate theDate) {
5: return
theDate.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault())
groovy.text.TemplateParseException: Template parse error 'Unexpected
input: '(' ' at line 4, column 12
3:
--> 4: def dayName(java.time.LocalDate theDate) {
5: return
theDate.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault())
If there a way to define function in the text processed that would
work with the StreamingTemplateEngine?
The code works fine "the other way around" i.e from Groovy code:
def now = java.time.LocalDate.now()
def dayName(java.time.LocalDate theDate) {
return
theDate.getDayOfWeek().getDisplayName(java.time.format.TextStyle.FULL,
java.util.Locale.getDefault())
}
println "# Hello"
println "Today ${dayName(now)}) is ${now}."
println "The weather in next 3 days will be:"
def weather = [ "Sunny", "Rainy", "Cloudy", "Windy" ]
for (i = 1; i < 4; i++) {
def day = now.plusDays(i)
Collections.shuffle weather
println "- " + dayName(day) + ": " + weather.first()
}
But I would like a "Markdown first" kind of experience rather than a
"Groovy first" since in the "normal" case, the amount of text vastly
outnumbers the amount of code.
Best regards,
Per
