Class: TextUtils::PageTemplate

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

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(tmpl) ⇒ PageTemplate

Returns a new instance of PageTemplate.



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# File 'lib/textutils/page.rb', line 102

def initialize( tmpl )
  @tmpl = tmpl.dup   # make a copy; just to be sure no one will change text
end

Class Method Details

.read(path) ⇒ Object 



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# File 'lib/textutils/page.rb', line 97

def self.read( path )
  self.new( File.read_utf8( path ) )
end

Instance Method Details

#cleanup_newlines(text) ⇒ Object 



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# File 'lib/textutils/page.rb', line 173

def cleanup_newlines( text )
  # remove all blank lines that go over three
  text.gsub( /\n{4,}/, "\n\n\n" )
end

#concat_lines(text) ⇒ Object 



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# File 'lib/textutils/page.rb', line 179

def concat_lines( text )
  #  lines ending with  ++  will get newlines get removed
  # e.g.
  # >|   hello1 ++
  # >1   hello2
  #  becomes
  # >|   hello1 hello2
  
  #
  # note: do NOT use \s - will include \n (newline) ??
  
  text.gsub( /[ \t]+\+{2}[ \t]*\n[ \t]*/, ' ' )  # note: replace with single space
end

#django_to_erb(text) ⇒ Object

filters

- use better names and make public for reuse!!!!



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# File 'lib/textutils/page.rb', line 130

def django_to_erb( text )
  ## convert django style markers to erb style marker e.g
  #  {% %} becomes <% %>  -- supports multi-line
  #  {{ }} becomes <%= %>  - does NOT support multi-line

  ## comments (support multi-line)
  text = text.gsub( /\{#(.+?)#\}/m ) do |_|
   "<%# #{1} %>"
  end

  text = text.gsub( /\{%(.+?)%\}/m ) do |_|
    ## note: also replace newlines w/  %>\n<%  to split
    #   multi-line stmts into single-line stmts
    # lets us use
    # {%
    #  %} will become
    # <%  %>
    # <%  %>
    "<% #{$1} %>".gsub( "\n", " %>\n<% " )
  end

  # note: for now {{ }} will NOT support multi-line
  text = text.gsub( /\{\{(.+?)\}\}/ ) do |_|
    "<%= #{$1} %>"
  end

  text
end

#remove_blanks(text) ⇒ Object 



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# File 'lib/textutils/page.rb', line 168

def remove_blanks( text )
  # remove lines only with  ..
  text.gsub( /^[ \t]*\.{2}[ \t]*\n/, '' )
end

#remove_html_comments(text) ⇒ Object 



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# File 'lib/textutils/page.rb', line 159

def remove_html_comments( text )
  text.gsub( /<!--.+?-->/, '' )
end

#remove_leading_spaces(text) ⇒ Object 



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# File 'lib/textutils/page.rb', line 163

def remove_leading_spaces( text )
  # remove leading spaces if less than four !!!
  text.gsub( /^[ \t]+(?![ \t])/, '' )    # use negative regex lookahead e.g. (?!)
end

#render(ctx) ⇒ Object 



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# File 'lib/textutils/page.rb', line 106

def render( ctx )
# note: erb offers the following trim modes:
#  1) <> omit newline for lines starting with <% and ending in %>
#  2)  >  omit newline for lines ending in %>
#  3)  omit blank lines ending in -%>
  ## run filters
  tmpl = remove_html_comments( @tmpl )
  tmpl = remove_blanks( tmpl )

  tmpl = django_to_erb( tmpl )  ## allow django/jinja style templates

  tmpl = remove_leading_spaces( tmpl )
  tmpl = concat_lines( tmpl )

  text = ERB.new( tmpl, nil, '<>' ).result( ctx )

  ### text = cleanup_newlines( text )
  text
end