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)
println template.make()
Cheers, Paul.
On Sun, Jul 24, 2022 at 6:35 AM Per Nyfelt <p...@alipsa.se> 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())}%># HelloToday (<%= 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
>
>
>
