class Slim::Interpolation

Perform interpolation of #{var_name} in the expressions `[:slim, :interpolate, string]`.

@api private

Public Instance Methods

on_slim_interpolate(string) click to toggle source

Handle interpolate expression `[:slim, :interpolate, string]`

@param [String] string Static interpolate @return [Array] Compiled temple expression

# File lib/slim/interpolation.rb, line 11
def on_slim_interpolate(string)
  # Interpolate variables in text (#{variable}).
  # Split the text into multiple dynamic and static parts.
  block = [:multi]
  begin
    case string
    when /\A\#\{/
      # Escaped interpolation
      block << [:static, '#{']
      string = $'
    when /\A#\{/
      # Interpolation
      string, code = parse_expression($')
      escape = code !~ /\A\{.*\}\Z/
      block << [:slim, :output, escape, escape ? code : code[1..-2], [:multi]]
    when /\A([#\]|[^#\]*)/
      # Static text
      block << [:static, $&]
      string = $'
    end
  end until string.empty?
  block
end

Protected Instance Methods

parse_expression(string) click to toggle source
# File lib/slim/interpolation.rb, line 37
def parse_expression(string)
  count, i = 1, 0
  while i < string.size && count != 0
    if string[i] == ?{
      count += 1
    elsif string[i] == ?}
      count -= 1
    end
    i += 1
  end

  raise(Temple::FilterError, "Text interpolation: Expected closing }") if count != 0

  return string[i..-1], string[0, i-1]
end