Class: Migr8::Util::Template

Inherits:
Object
  • Object
show all
Defined in:
lib/migr8.rb

Constant Summary collapse

EMBED_REXP = 
/(^[ \t]*)?<%(==?|\#)?(.*?)%>([ \t]*\r?\n)?/m

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(input = "") ⇒ Template

Returns a new instance of Template.



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# File 'lib/migr8.rb', line 2229

def initialize(input="")
  #; [!6z4kp] converts input string into ruby code.
  self.src = convert(input)
end

Instance Attribute Details

#src ⇒ Object

Returns the value of attribute src.



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# File 'lib/migr8.rb', line 2234

def src
  @src
end

Instance Method Details

#convert(input) ⇒ Object 



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# File 'lib/migr8.rb', line 2252

def convert(input)
  #; [!118pw] converts template string into ruby code.
  #; [!7ht59] escapes '`' and '\\' characters.
  src = "_buf = '';"       # preamble
  pos = 0
  input.scan(EMBED_REXP) do |lspace, ch, code, rspace|
    match = Regexp.last_match
    text  = input[pos...match.begin(0)]
    pos   = match.end(0)
    src << _t(text)
    #; [!u93y5] wraps expression by 'escape()' when <%= %>.
    #; [!auj95] leave expression as it is when <%== %>.
    if ch == '='           # expression (escaping)
      src << _t(lspace) << " _buf << (escape(#{code})).to_s;" << _t(rspace)
    elsif ch == '=='       # expression (without escaping)
      src << _t(lspace) << " _buf << (#{code}).to_s;" << _t(rspace)
    elsif ch == '#'        # comment
      src << _t(lspace) << ("\n" * code.count("\n")) << _t(rspace)
    else                   # statement
      if lspace && rspace
        src << "#{lspace}#{code}#{rspace};"
      else
        src << _t(lspace) << code << ';' << _t(rspace)
      end
    end
  end
  #; [!b10ns] generates ruby code correctly even when no embedded code.
  rest = $' || input
  src << _t(rest)
  src << "\n_buf.to_s\n"   # postamble
  return src
end

#render(context = {}) ⇒ Object 



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# File 'lib/migr8.rb', line 2241

def render(context={})
  #; [!umsfx] takes hash object as context variables.
  #; [!p0po0] context argument can be null.
  ctx = TemplateContext.new(context)
  #; [!48pfc] returns rendered string.
  #; [!1i0v8] escapes "'" into "''" when '<%= %>', and not when '<%== %>'.
  return ctx.instance_eval(&@_proc)
end