Re: Defining functions in text processed by the StreamingTemplateEngine

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
>
>