Module: Slim::Compiler

Includes:
Optimizer
Included in:
Engine
Defined in:
lib/slim/compiler.rb

Constant Summary collapse

AUTOCLOSED = 
%w(meta img link br hr input area param col base)
REGEX = 
/^(\s*)(!?`?\|?-?=?\w*)(\s*\w*=".+")?(.*)/

Instance Method Summary collapse

Methods included from Optimizer

#optimize

Instance Method Details

#compile ⇒ Object 



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# File 'lib/slim/compiler.rb', line 12

def compile
  @_buffer = ["_buf = [];"]

  @in_text = false

  text_indent = last_indent = -1; enders = []

  @template.each_line do |line|
    line.chomp!; line.rstrip!

    if line.length == 0
      @_buffer << "_buf << \"<br/>\";" if @in_text
      next 
    end

    line    =~ REGEX

    indent  =   $1.to_s.length

    if @in_text && indent > text_indent
      spaces = indent - text_indent
      @_buffer << "_buf << \"#{(' '*(spaces - 1)) + line.lstrip}\";"
      next
    end

    marker        =   $2
    attrs         =   $3
    string        =   $4 

    line_type     = case marker
                    when '`', '|' then :text
                    when '-' then :control_code
                    when '=' then :output_code
                    when '!' then :declaration
                    else :markup
                    end

    if line_type != :text
      @in_text    = false
      text_indent = -1
    end

    if attrs
      attrs.gsub!('"', '\"') 
    end

    if string
      string.strip!
      string    = nil unless string.strip.length > 0
    end

    unless indent > last_indent
      begin
        break if enders.empty?
        continue_closing = true
        ender, ender_indent = enders.pop

        if ender_indent >= indent
          unless ender == 'end;' && line_type == :control_code && ender_indent == indent
            @_buffer << ender
          end
        else
          enders << [ender, ender_indent] 
          continue_closing = false
        end
      end while continue_closing == true
    end

    last_indent = indent

    case line_type
    when :markup
      if AUTOCLOSED.include?(marker)
        @_buffer << "_buf << \"<#{marker}#{attrs || ''}/>\";"
      else
        enders << ["_buf << \"</#{marker}>\";", indent]
        @_buffer << "_buf << \"<#{marker}#{attrs || ''}>\";"
      end

      if string
        string.lstrip!
        if string =~ /^=(.*)/
          @_buffer << "_buf << #{$1.strip};"
        else
          @_buffer << "_buf << \"#{string}\";"
        end
      end
    when :text
      @in_text = true
      text_indent = indent
      
      @_buffer << "_buf << \"#{string}\";" if string.to_s.length > 0
    when :control_code
      unless enders.detect{|e| e[0] == 'end;' && e[1] == indent}
        enders << ['end;', indent]
      end
      @_buffer << "#{string};"
    when :output_code
      @_buffer << "_buf << #{string};"
    when :declaration
      @_buffer << "_buf << \"<!#{string}>\";"
    else
      raise NotImplementedError.new("Don't know how to parse line: #{line}")
    end
  end # template iterator

  enders.reverse_each do |t|
    @_buffer << t[0].to_s
  end

  @_buffer << "_buf.join;"

  @compiled = @_buffer.join

  optimize

  return nil
end