Re: Defining functions in text processed by the StreamingTemplateEngine

Even better! Thank you!


On 7/23/22 23:55, Paul King wrote:
> The SimpleTemplateEngine supports methods (and imports and even local 
> class definitions):
>
> def text ="""\ <% import java.time.LocalDate import java.time.format.TextStyle 
> def now = LocalDate.now() def dayName(theDate) { 
> theDate.dayOfWeek.getDisplayName(TextStyle.FULL, Locale.default) } 
> class Const { static days = 3 } %> # Hello Today (<%= dayName(now) %>) 
> is <%= now %>. The weather in next <%= Const.days %> days will be: <% 
> def weather = [ "Sunny", "Rainy", "Cloudy", "Windy" ] Const.days.times 
> { out.println "- " + dayName(now + it) + ": " + weather.shuffled()[0] 
> } %> """.stripIndent()
>
> def engine =new groovy.text.SimpleTemplateEngine()
> def template =engine.createTemplate(text)
> printlntemplate.make()
> Cheers, Paul.
>
>
> On Sun, Jul 24, 2022 at 6:35 AM Per Nyfelt <[email protected]> wrote:
>
>     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
>>
>>