Class: BlueCloth

Inherits:
Object
  • Object
show all
Defined in:
lib/bluecloth.rb,
ext/bluecloth.c

Overview

Bluecloth is a Ruby implementation of Markdown, a text-to-HTML conversion tool.

Authors

Contributors

This product includes software developed by David Loren Parsons <www.pell.portland.or.us/~orc>.

Version

$Id: bluecloth.rb,v 20ece393cda0 2011/02/10 01:37:48 ged $

License

:include: LICENSE – Please see the LICENSE file included in the distribution for copyright and licensing details.

Constant Summary collapse

VERSION =

Release Version

'2.0.11'
DEFAULT_OPTIONS =

The defaults for all supported options.

{
  :alphalists       => true,
  :auto_links       => false,
  :definition_lists => false,
  :divquotes        => false,
  :escape_html      => false,
  :expand_tabs      => true,
  :header_labels    => false,
  :mdtest_1_compat  => false,
  :pandoc_headers   => false,
  :pseudoprotocols  => false,
  :relaxed          => false,
  :remove_images    => false,
  :remove_links     => false,
  :safe_links       => false,
  :smartypants      => true,
  :strict_mode      => true,
  :strikethrough    => true,
  :superscript      => false,
  :tables           => false,
  :tagtext_mode     => false,
  :xml_cdata        => false,
}.freeze
INSPECT_TEXT_LENGTH =

The number of characters of the original markdown source to include in the output of #inspect

50

INT2FIX(MKD_NOLINKS)
MKD_NOIMAGE =

Do not process ‘![]’ and remove IMG tags from the output.

INT2FIX(MKD_NOIMAGE)
MKD_NOPANTS =

Do not do Smartypants-style mangling of quotes, dashes, or ellipses.

INT2FIX(MKD_NOPANTS)
MKD_NOHTML =

Escape all opening angle brackets in the input text instead of allowing block-level HTML

INT2FIX(MKD_NOHTML)
MKD_STRICT =

disable SUPERSCRIPT, RELAXED_EMPHASIS

INT2FIX(MKD_STRICT)
MKD_TAGTEXT =

process text inside an html tag; no <em>, no <bold>, no html or [] expansion

INT2FIX(MKD_TAGTEXT)
MKD_NO_EXT =

don’t allow pseudo-protocols

INT2FIX(MKD_NO_EXT)
MKD_CDATA =

Generate code for xml ![CDATA]

INT2FIX(MKD_CDATA)
MKD_NOSUPERSCRIPT =

Don’t use superscript extension

INT2FIX(MKD_NOSUPERSCRIPT)
MKD_NORELAXED =

Relaxed emphasis – emphasis happens everywhere

INT2FIX(MKD_NORELAXED)
MKD_NOTABLES =

disallow tables

INT2FIX(MKD_NOTABLES)
MKD_NOSTRIKETHROUGH =

forbid ~~strikethrough~~

INT2FIX(MKD_NOSTRIKETHROUGH)
MKD_TOC =

do table-of-contents processing

INT2FIX(MKD_TOC)
MKD_1_COMPAT =

MarkdownTest 1.0 Compatibility Mode

INT2FIX(MKD_1_COMPAT)
MKD_EMBED =

MKD_NOLINKS|MKD_NOIMAGE|MKD_TAGTEXT

INT2FIX(MKD_EMBED)

INT2FIX(MKD_AUTOLINK)

INT2FIX(MKD_SAFELINK)
MKD_NOHEADER =

don’t process header blocks

INT2FIX(MKD_NOHEADER)
MKD_TABSTOP =

Expand tabs to 4 spaces

INT2FIX(MKD_TABSTOP)
MKD_NODIVQUOTE =

Forbid ‘>%class%’ blocks

INT2FIX(MKD_NODIVQUOTE)
MKD_NOALPHALIST =

Forbid alphabetic lists

INT2FIX(MKD_NOALPHALIST)
MKD_NODLIST =

Forbid definition lists

INT2FIX(MKD_NODLIST)

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#new(string = '', options = DEFAULT_OPTIONS) ⇒ Object

Create a new BlueCloth object that will process the given string. The options argument is a Hash that can be used to control the generated markup, and to enable/disable extensions. The supported options are:

:remove_links

Ignore links in Markdown, and escape A tags in the output. Defaults to false.

:remove_images

Ignore images in Markdown, and escape IMG tags in the output. Defaults to false.

:smartypants

Do Smartypants-style mangling of quotes, dashes, or ellipses. Defaults to true.

:pseudoprotocols

Support Discount’s pseudo-protocol links. Defaults to false.

:pandoc_headers

Support the extraction of Pandoc headers, which can be fetched as a Hash via the #header method. Defaults to false.

:header_labels

Generate ID attributes for all headers. Defaults to false.

:escape_html

Escape all HTML in the input string. Defaults to false.

:strict_mode

Disables Discount’s relaxed emphasis (ignores underscores in the middle of words) and superscript notation. Defaults to true.



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# File 'ext/bluecloth.c', line 184

static VALUE
bluecloth_initialize( int argc, VALUE *argv, VALUE self ) {
  if ( !bluecloth_check_ptr(self) ) {
    MMIOT *document;
    VALUE text, optflags, fullhash, opthash = Qnil;
    int flags = 0;
    VALUE utf8text = Qnil;

    rb_scan_args( argc, argv, "02", &text, &opthash );

    /* Default empty string and options */
    if ( argc == 0 ) {
      text = rb_str_new( "", 0 );
    }

    /* One arg could be either the text or the opthash, so shift the args if appropriate */
    else if ( argc == 1 && (TYPE(text) == T_HASH || TYPE(text) == T_FIXNUM) ) {
      opthash = text;
      text = rb_str_new( "", 0 );
    }
    else {
      text = rb_obj_dup( rb_obj_as_string(text) );
    }

    /* Merge the options hash with the defaults and turn it into a flags int */
    if ( NIL_P(opthash) ) opthash = rb_hash_new();
    optflags = rb_funcall( bluecloth_cBlueCloth, rb_intern("flags_from_opthash"), 1, opthash );
    fullhash = rb_funcall( bluecloth_cBlueCloth, rb_intern("opthash_from_flags"), 1, optflags );

    flags = NUM2INT( optflags );

#ifdef M17N_SUPPORTED
    bluecloth_debug( "Bytes before utf8ification: %s",
      RSTRING_PTR(rb_funcall(text, rb_intern("dump"), 0, Qnil)) );
    utf8text = rb_str_export_to_enc( rb_str_dup(text), rb_utf8_encoding() );
    DATA_PTR( self ) = document = bluecloth_alloc( utf8text, flags );
#else
    DATA_PTR( self ) = document = bluecloth_alloc( text, flags );
#endif /* M17N_SUPPORTED */

    if ( !mkd_compile(document, flags) )
      rb_raise( rb_eRuntimeError, "Failed to compile markdown" );

    OBJ_FREEZE( text );
    rb_iv_set( self, "@text", text );
    OBJ_FREEZE( fullhash );
    rb_iv_set( self, "@options", fullhash );

    OBJ_INFECT( self, text );
  }

  return self;
}

Instance Attribute Details

#options ⇒ Object (readonly)

The options hash that describes the options in effect when the object was created

#text ⇒ Object (readonly)

The original Markdown text the object was constructed with

Class Method Details

.discount_version ⇒ String

Return the version string of the Discount library BlueCloth was built on.

Returns:

  • (String) 


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# File 'ext/bluecloth.c', line 146

static VALUE
bluecloth_s_discount_version( VALUE klass ) {
  return rb_str_new2( markdown_version );
}

.flags_from_opthash(opthash = {}) ⇒ Object

Convert the specified opthash into a flags bitmask. If it’s already a Fixnum (e.g., if someone passed in an ORed flags argument instead of an opthash), just return it as-is.



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# File 'lib/bluecloth.rb', line 71

def self::flags_from_opthash( opthash={} )
  return opthash if opthash.is_a?( Integer )

  # Support BlueCloth1-style options
  if opthash == :filter_html || opthash == [:filter_html]
    opthash = { :escape_html => true }
  elsif opthash == :filter_styles
    opthash = {}
  elsif !opthash.is_a?( Hash )
    raise ArgumentError, "option %p not supported" % [ opthash ]
  end

  flags = 0

  if   opthash[:remove_links]     then flags |= MKD_NOLINKS;         end
  if   opthash[:remove_images]    then flags |= MKD_NOIMAGE;         end
  if ! opthash[:smartypants]      then flags |= MKD_NOPANTS;         end
  if   opthash[:escape_html]      then flags |= MKD_NOHTML;          end
  if   opthash[:strict_mode]      then flags |= MKD_STRICT;          end
  if   opthash[:tagtext_mode]     then flags |= MKD_TAGTEXT;         end
  if ! opthash[:pseudoprotocols]  then flags |= MKD_NO_EXT;          end
  if   opthash[:xml_cdata]        then flags |= MKD_CDATA;           end
  if ! opthash[:superscript]      then flags |= MKD_NOSUPERSCRIPT;   end
  if ! opthash[:relaxed]          then flags |= MKD_NORELAXED;       end
  if ! opthash[:tables]           then flags |= MKD_NOTABLES;        end
  if ! opthash[:strikethrough]    then flags |= MKD_NOSTRIKETHROUGH; end
  if   opthash[:header_labels]    then flags |= MKD_TOC;             end
  if   opthash[:mdtest_1_compat]  then flags |= MKD_1_COMPAT;        end
  if   opthash[:auto_links]       then flags |= MKD_AUTOLINK;        end
  if   opthash[:safe_links]       then flags |= MKD_SAFELINK;        end
  if ! opthash[:pandoc_headers]   then flags |= MKD_NOHEADER;        end
  if   opthash[:expand_tabs]      then flags |= MKD_TABSTOP;         end
  if ! opthash[:divquotes]        then flags |= MKD_NODIVQUOTE;      end
  if ! opthash[:alphalists]       then flags |= MKD_NOALPHALIST;     end
  if ! opthash[:definition_lists] then flags |= MKD_NODLIST;         end

  return flags
end

.opthash_from_flags(flags = 0) ⇒ Object

Returns a Hash that reflects the settings from the specified flags Integer.



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# File 'lib/bluecloth.rb', line 112

def self::opthash_from_flags( flags=0 )
  flags = flags.to_i

  opthash = {}
  if  ( flags & MKD_NOLINKS         ).nonzero? then opthash[:remove_links]     = true; end
  if  ( flags & MKD_NOIMAGE         ).nonzero? then opthash[:remove_images]    = true; end
  if !( flags & MKD_NOPANTS         ).nonzero? then opthash[:smartypants]      = true; end
  if  ( flags & MKD_NOHTML          ).nonzero? then opthash[:escape_html]      = true; end
  if  ( flags & MKD_STRICT          ).nonzero? then opthash[:strict_mode]      = true; end
  if  ( flags & MKD_TAGTEXT         ).nonzero? then opthash[:tagtext_mode]     = true; end
  if !( flags & MKD_NO_EXT          ).nonzero? then opthash[:pseudoprotocols]  = true; end
  if  ( flags & MKD_CDATA           ).nonzero? then opthash[:xml_cdata]        = true; end
  if !( flags & MKD_NOSUPERSCRIPT   ).nonzero? then opthash[:superscript]      = true; end
  if !( flags & MKD_NORELAXED       ).nonzero? then opthash[:relaxed]          = true; end
  if !( flags & MKD_NOTABLES        ).nonzero? then opthash[:tables]           = true; end
  if !( flags & MKD_NOSTRIKETHROUGH ).nonzero? then opthash[:strikethrough]    = true; end
  if  ( flags & MKD_TOC             ).nonzero? then opthash[:header_labels]    = true; end
  if  ( flags & MKD_1_COMPAT        ).nonzero? then opthash[:mdtest_1_compat]  = true; end
  if  ( flags & MKD_AUTOLINK        ).nonzero? then opthash[:auto_links]       = true; end
  if  ( flags & MKD_SAFELINK        ).nonzero? then opthash[:safe_links]       = true; end
  if !( flags & MKD_NOHEADER        ).nonzero? then opthash[:pandoc_headers]   = true; end
  if  ( flags & MKD_TABSTOP         ).nonzero? then opthash[:expand_tabs]      = true; end
  if !( flags & MKD_NODIVQUOTE      ).nonzero? then opthash[:divquotes]        = true; end
  if !( flags & MKD_NOALPHALIST     ).nonzero? then opthash[:alphalists]       = true; end
  if !( flags & MKD_NODLIST         ).nonzero? then opthash[:definition_lists] = true; end

  return opthash
end

Instance Method Details

#filter_html ⇒ Object

Backward-compatible method: return true if the object’s :escape_html option was set.



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# File 'lib/bluecloth.rb', line 161

def filter_html
  return self.options[:escape_html]
end

#filter_html=(arg) ⇒ Object

Backward-compatible method: raises an appropriate error notifying the user that BlueCloth2 doesn’t support this option.

Raises:

  • (NotImplementedError) 


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# File 'lib/bluecloth.rb', line 168

def filter_html=( arg )
  raise NotImplementedError,
    "Sorry, this version of BlueCloth no longer supports toggling of HTML filtering" +
    "via #filter_html=. You now must create the BlueCloth object with the :escape_html" +
    "option set to true instead."
end

#header ⇒ Hash Also known as: pandoc_header

Return the hash of Pandoc-style headers from the parsed document. If there were no headers, or the BlueCloth object was not constructed with the :pandoc_headers option enabled, an empty Hash is returned.

markdown = "%title My Essay\n%author Me\n%date Today\n\nSome stuff..."
bc = BlueCloth.new( markdown, :pandoc_headers => true )
# =>
bc.header
# =>

Returns:

  • (Hash) 


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# File 'ext/bluecloth.c', line 296

static VALUE
bluecloth_header( VALUE self ) {
  MMIOT *document = bluecloth_get_ptr( self );
  char *field;
  VALUE fieldstring, headers = rb_hash_new();

  bluecloth_debug( "Fetching pandoc headers for document %p", document );

  if ( (field = mkd_doc_title(document)) ) {
    fieldstring = rb_str_new2( field );
    OBJ_INFECT( fieldstring, self );
    rb_hash_aset( headers, ID2SYM(rb_intern("title")), fieldstring );
  }
  if ( (field = mkd_doc_author(document)) ) {
    fieldstring = rb_str_new2( field );
    OBJ_INFECT( fieldstring, self );
    rb_hash_aset( headers, ID2SYM(rb_intern("author")), fieldstring );
  }
  if ( (field = mkd_doc_date(document)) ) {
    fieldstring = rb_str_new2( field );
    OBJ_INFECT( fieldstring, self );
    rb_hash_aset( headers, ID2SYM(rb_intern("date")), fieldstring );
  }

  return headers;
}

#inspect ⇒ Object

Return a human-readable representation of the object suitable for debugging.



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# File 'lib/bluecloth.rb', line 147

def inspect
  return "#<%s:0x%x text: %p; options: %p>" % [
    self.class.name,
    self.object_id / 2,
    self.text.length > INSPECT_TEXT_LENGTH ?
      self.text[ 0, INSPECT_TEXT_LENGTH - 5] + '[...]' :
      self.text,
    self.options,
  ]
end

#to_html ⇒ String

Transform the document into HTML.

Returns:

  • (String) 


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# File 'ext/bluecloth.c', line 246

static VALUE
bluecloth_to_html( VALUE self ) {
  MMIOT *document = bluecloth_get_ptr( self );
  char *output;
  int length;
  VALUE result = Qnil;

  bluecloth_debug( "Compiling document %p", document );

  if ( (length = mkd_document( document, &output )) != EOF ) {
#ifdef M17N_SUPPORTED
    VALUE orig_encoding = rb_obj_encoding( rb_iv_get(self, "@text") );
    VALUE utf8_result = rb_enc_str_new( output, strlen(output), rb_utf8_encoding() );
    result = rb_str_encode( utf8_result, orig_encoding, 0, Qnil );
    bluecloth_debug( "Bytes after un-utf8ification (if necessary): %s",
      RSTRING_PTR(rb_funcall(result, rb_intern("dump"), 0, Qnil)) );
#else
    result = rb_str_new2( output );
#endif /* M17N_SUPPORTED */

    OBJ_INFECT( result, self );

    return result;
  } else {
    return Qnil;
  }
}