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Size: 1.17 KB
Versions: 67
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Stored size: 1.17 KB
Contents
require 'parslet'
module ExpressTemplates
class Interpolator < Parslet::Parser
rule(:lbrace) { str('{{') }
rule(:rbrace) { str('}}') }
rule(:delim) { lbrace | rbrace }
rule(:lpart) { (lbrace.absnt? >> any).repeat.as(:lpart) }
rule(:rpart) { (rbrace.absnt? >> any).repeat.as(:rpart) }
rule(:expression) { (text_with_interpolations).as(:expression) }
rule(:interpolation) { (lbrace>>expression>>rbrace).as(:interpolation) }
rule(:text) { (delim.absnt? >> any).repeat(1) }
rule(:text_with_interpolations) { (text.as(:text) | interpolation).repeat }
root(:text_with_interpolations)
def self.transform(s)
begin
Transformer.new.apply(new.parse(s)).flatten.join
rescue Parslet::ParseFailed => failure
puts s
puts failure.cause.ascii_tree
raise failure
end
end
end
class Transformer < Parslet::Transform
rule(:interpolation => simple(:expression)) {
'#{'+expression+'}'
}
rule(:expression => sequence(:exp)) do
exp.map(&:to_s).join.gsub('\\"', '"')
end
rule(:text => simple(:s)) { s.to_s }
end
end
Version data entries
67 entries across 67 versions & 2 rubygems