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.



2227
2228
2229
2230
 
# File 'lib/migr8.rb', line 2227

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.



2232
2233
2234
 
# File 'lib/migr8.rb', line 2232

def src
  @src
end

Instance Method Details

#convert(input) ⇒ Object 



2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
 
# File 'lib/migr8.rb', line 2250

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 



2239
2240
2241
2242
2243
2244
2245
2246
 
# File 'lib/migr8.rb', line 2239

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