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Contents
module Hamlit
module Concerns
module StringInterpolation
def string_literal(str)
unescape_interpolation(str)
end
def contains_interpolation?(str)
/#[\{$@]/ === str
end
private
def unescape_interpolation(str)
res = ''
rest = handle_interpolation(str.inspect) do |scan|
escapes = (scan[2].size - 1) / 2
res << scan.matched[0...-3 - escapes]
if escapes % 2 == 1
res << '#{'
else
content = eval('"' + balance(scan, ?{, ?}, 1)[0][0...-1] + '"')
res << '#{' + content + '}'
end
end
res + rest
end
def handle_interpolation(str)
scan = StringScanner.new(str)
yield scan while scan.scan(/(.*?)(\\*)\#\{/)
scan.rest
end
def balance(scanner, start, finish, count = 0)
str = ''
scanner = StringScanner.new(scanner) unless scanner.is_a? StringScanner
regexp = Regexp.new("(.*?)[\\#{start.chr}\\#{finish.chr}]", Regexp::MULTILINE)
while scanner.scan(regexp)
str << scanner.matched
count += 1 if scanner.matched[-1] == start
count -= 1 if scanner.matched[-1] == finish
return [str.strip, scanner.rest] if count == 0
end
end
end
end
end
Version data entries
52 entries across 52 versions & 1 rubygems