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# -*- coding: utf-8 -*-
#
#--
# Copyright (C) 2009-2012 Thomas Leitner <t_leitner@gmx.at>
#
# This file is part of kramdown.
#
# kramdown is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#++
#
require 'yaml'
module Kramdown
# This module defines all options that are used by parsers and/or converters as well as providing
# methods to deal with the options.
module Options
# Helper class introducing a boolean type for specifying boolean values (+true+ and +false+) as
# option types.
class Boolean
# Return +true+ if +other+ is either +true+ or +false+
def self.===(other)
FalseClass === other || TrueClass === other
end
end
# ----------------------------
# :section: Option definitions
#
# This sections describes the methods that can be used on the Options module.
# ----------------------------
# Struct class for storing the definition of an option.
Definition = Struct.new(:name, :type, :default, :desc, :validator)
# Allowed option types.
ALLOWED_TYPES = [String, Integer, Float, Symbol, Boolean, Object]
@options = {}
# Define a new option called +name+ (a Symbol) with the given +type+ (String, Integer, Float,
# Symbol, Boolean, Object), default value +default+ and the description +desc+. If a block is
# specified, it should validate the value and either raise an error or return a valid value.
#
# The type 'Object' should only be used for complex types for which none of the other types
# suffices. A block needs to be specified when using type 'Object' and it has to cope with
# a value given as string and as the opaque type.
def self.define(name, type, default, desc, &block)
raise ArgumentError, "Option name #{name} is already used" if @options.has_key?(name)
raise ArgumentError, "Invalid option type #{type} specified" if !ALLOWED_TYPES.include?(type)
raise ArgumentError, "Invalid type for default value" if !(type === default) && !default.nil?
raise ArgumentError, "Missing validator block" if type == Object && block.nil?
@options[name] = Definition.new(name, type, default, desc, block)
end
# Return all option definitions.
def self.definitions
@options
end
# Return +true+ if an option called +name+ is defined.
def self.defined?(name)
@options.has_key?(name)
end
# Return a Hash with the default values for all options.
def self.defaults
temp = {}
@options.each {|n, o| temp[o.name] = o.default}
temp
end
# Merge the #defaults Hash with the *parsed* options from the given Hash, i.e. only valid option
# names are considered and their value is run through the #parse method.
def self.merge(hash)
temp = defaults
hash.each do |k,v|
next unless @options.has_key?(k)
temp[k] = parse(k, v)
end
temp
end
# Parse the given value +data+ as if it was a value for the option +name+ and return the parsed
# value with the correct type.
#
# If +data+ already has the correct type, it is just returned. Otherwise it is converted to a
# String and then to the correct type.
def self.parse(name, data)
raise ArgumentError, "No option named #{name} defined" if !@options.has_key?(name)
if !(@options[name].type === data)
data = data.to_s
data = if @options[name].type == String
data
elsif @options[name].type == Integer
Integer(data) rescue raise Kramdown::Error, "Invalid integer value for option '#{name}': '#{data}'"
elsif @options[name].type == Float
Float(data) rescue raise Kramdown::Error, "Invalid float value for option '#{name}': '#{data}'"
elsif @options[name].type == Symbol
data.strip!
data = data[1..-1] if data[0] == ?:
(data.empty? || data == 'nil' ? nil : data.to_sym)
elsif @options[name].type == Boolean
data.downcase.strip != 'false' && !data.empty?
end
end
data = @options[name].validator[data] if @options[name].validator
data
end
# ----------------------------
# :section: Option Validators
#
# This sections contains all pre-defined option validators.
# ----------------------------
# Ensures that the option value +val+ for the option called +name+ is a valid array. The
# parameter +val+ can be
#
# - a comma separated string which is split into an array of values
# - or an array.
#
# Additionally, the array is checked for the correct size.
def self.simple_array_validator(val, name, size)
if String === val
val = val.split(/,/)
elsif !(Array === val)
raise Kramdown::Error, "Invalid type #{val.class} for option #{name}"
end
if val.size != size
raise Kramdown::Error, "Option #{name} needs exactly #{size} values"
end
val
end
# ----------------------------
# :section: Option Definitions
#
# This sections contains all option definitions that are used by the included
# parsers/converters.
# ----------------------------
define(:template, String, '', <<EOF)
The name of an ERB template file that should be used to wrap the output
This is used to wrap the output in an environment so that the output can
be used as a stand-alone document. For example, an HTML template would
provide the needed header and body tags so that the whole output is a
valid HTML file. If no template is specified, the output will be just
the converted text.
When resolving the template file, the given template name is used first.
If such a file is not found, the converter extension is appended. If the
file still cannot be found, the templates name is interpreted as a
template name that is provided by kramdown (without the converter
extension).
kramdown provides a default template named 'document' for each converter.
Default: ''
Used by: all converters
EOF
define(:vietnamese_ids, Boolean, true, <<EOF)
Support Vietnamsese when generating header ID
If this option is `true` (and when `auto_ids` is true) ID values in
Vietnamese will be converted to a readable form (non-accent version
of the origin text).
This option should be used only if `auto_ids` is true.
Example: "Đây-là-ví-dụ" will generate new ID `day-la-vi-du` which is very
readable by Vietnamese. When this option is `false`, its ID should be
`y-l-v-d` which is unreadable (non-sense ID).
Default: true
Used by: HTML/Latex convertor
EOF
define(:auto_ids, Boolean, true, <<EOF)
Use automatic header ID generation
If this option is `true`, ID values for all headers are automatically
generated if no ID is explicitly specified.
Default: true
Used by: HTML/Latex converter
EOF
define(:auto_id_prefix, String, '', <<EOF)
Prefix used for automatically generated heaer IDs
This option can be used to set a prefix for the automatically generated
header IDs so that there is no conflict when rendering multiple kramdown
documents into one output file separately. The prefix should only
contain characters that are valid in an ID!
Default: ''
Used by: HTML/Latex converter
EOF
define(:parse_block_html, Boolean, false, <<EOF)
Process kramdown syntax in block HTML tags
If this option is `true`, the kramdown parser processes the content of
block HTML tags as text containing block-level elements. Since this is
not wanted normally, the default is `false`. It is normally better to
selectively enable kramdown processing via the markdown attribute.
Default: false
Used by: kramdown parser
EOF
define(:parse_span_html, Boolean, true, <<EOF)
Process kramdown syntax in span HTML tags
If this option is `true`, the kramdown parser processes the content of
span HTML tags as text containing span-level elements.
Default: true
Used by: kramdown parser
EOF
define(:html_to_native, Boolean, false, <<EOF)
Convert HTML elements to native elements
If this option is `true`, the parser converts HTML elements to native
elements. For example, when parsing `<em>hallo</em>` the emphasis tag
would normally be converted to an `:html` element with tag type `:em`.
If `html_to_native` is `true`, then the emphasis would be converted to a
native `:em` element.
This is useful for converters that cannot deal with HTML elements.
Default: false
Used by: kramdown parser
EOF
define(:link_defs, Object, {}, <<EOF) do |val|
Pre-defines link definitions
This option can be used to pre-define link definitions. The value needs
to be a Hash where the keys are the link identifiers and the values are
two element Arrays with the link URL and the link title.
If the value is a String, it has to contain a valid YAML hash and the
hash has to follow the above guidelines.
Default: {}
Used by: kramdown parser
EOF
if String === val
begin
val = YAML.load(val)
rescue RuntimeError, ArgumentError, SyntaxError
raise Kramdown::Error, "Invalid YAML value for option link_defs"
end
end
raise Kramdown::Error, "Invalid type #{val.class} for option #{name}" if !(Hash === val)
val.each do |k,v|
if !(Array === v) || v.size > 2 || v.size < 1
raise Kramdown::Error, "Invalid structure for hash value of option #{name}"
end
v << nil if v.size == 1
end
val
end
define(:footnote_nr, Integer, 1, <<EOF)
The number of the first footnote
This option can be used to specify the number that is used for the first
footnote.
Default: 1
Used by: HTML converter
EOF
define(:enable_coderay, Boolean, true, <<EOF)
Use coderay for syntax highlighting
If this option is `true`, coderay is used by the HTML converter for
syntax highlighting the content of code spans and code blocks.
Default: true
Used by: HTML converter
EOF
define(:coderay_wrap, Symbol, :div, <<EOF)
Defines how the highlighted code should be wrapped
The possible values are :span, :div or nil.
Default: :div
Used by: HTML converter
EOF
define(:coderay_line_numbers, Symbol, :inline, <<EOF)
Defines how and if line numbers should be shown
The possible values are :table, :inline or nil. If this option is
nil, no line numbers are shown.
Default: :inline
Used by: HTML converter
EOF
define(:coderay_line_number_start, Integer, 1, <<EOF)
The start value for the line numbers
Default: 1
Used by: HTML converter
EOF
define(:coderay_tab_width, Integer, 8, <<EOF)
The tab width used in highlighted code
Used by: HTML converter
EOF
define(:coderay_bold_every, Integer, 10, <<EOF)
Defines how often a line number should be made bold
Default: 10
Used by: HTML converter
EOF
define(:coderay_css, Symbol, :style, <<EOF)
Defines how the highlighted code gets styled
Possible values are :class (CSS classes are applied to the code
elements, one must supply the needed CSS file) or :style (default CSS
styles are directly applied to the code elements).
Default: style
Used by: HTML converter
EOF
define(:coderay_default_lang, Symbol, nil, <<EOF)
Sets the default language for highlighting code blocks
If no language is set for a code block, the default language is used
instead. The value has to be one of the languages supported by coderay
or nil if no default language should be used.
Default: nil
Used by: HTML converter
EOF
define(:entity_output, Symbol, :as_char, <<EOF)
Defines how entities are output
The possible values are :as_input (entities are output in the same
form as found in the input), :numeric (entities are output in numeric
form), :symbolic (entities are output in symbolic form if possible) or
:as_char (entities are output as characters if possible, only available
on Ruby 1.9).
Default: :as_char
Used by: HTML converter, kramdown converter
EOF
define(:toc_levels, Object, (1..6).to_a, <<EOF) do |val|
Defines the levels that are used for the table of contents
The individual levels can be specified by separating them with commas
(e.g. 1,2,3) or by using the range syntax (e.g. 1..3). Only the
specified levels are used for the table of contents.
Default: 1..6
Used by: HTML/Latex converter
EOF
if String === val
if val =~ /^(\d)\.\.(\d)$/
val = Range.new($1.to_i, $2.to_i).to_a
elsif val =~ /^\d(?:,\d)*$/
val = val.split(/,/).map {|s| s.to_i}.uniq
else
raise Kramdown::Error, "Invalid syntax for option toc_levels"
end
elsif Array === val
val = val.map {|s| s.to_i}.uniq
else
raise Kramdown::Error, "Invalid type #{val.class} for option toc_levels"
end
if val.any? {|i| !(1..6).include?(i)}
raise Kramdown::Error, "Level numbers for option toc_levels have to be integers from 1 to 6"
end
val
end
define(:line_width, Integer, 72, <<EOF)
Defines the line width to be used when outputting a document
Default: 72
Used by: kramdown converter
EOF
define(:latex_headers, Object, %w{section subsection subsubsection paragraph subparagraph subparagraph}, <<EOF) do |val|
Defines the LaTeX commands for different header levels
The commands for the header levels one to six can be specified by
separating them with commas.
Default: section,subsection,subsubsection,paragraph,subparagraph,subparagraph
Used by: Latex converter
EOF
simple_array_validator(val, :latex_headers, 6)
end
define(:smart_quotes, Object, %w{lsquo rsquo ldquo rdquo}, <<EOF) do |val|
Defines the HTML entity names or code points for smart quote output
The entities identified by entity name or code point that should be
used for, in order, a left single quote, a right single quote, a left
double and a right double quote are specified by separating them with
commas.
Default: lsquo,rsquo,ldquo,rdquo
Used by: HTML/Latex converter
EOF
val = simple_array_validator(val, :smart_quotes, 4)
val.map! {|v| Integer(v) rescue v}
val
end
define(:remove_block_html_tags, Boolean, true, <<EOF)
Remove block HTML tags
If this option is `true`, the RemoveHtmlTags converter removes
block HTML tags.
Default: true
Used by: RemoveHtmlTags converter
EOF
define(:remove_span_html_tags, Boolean, false, <<EOF)
Remove span HTML tags
If this option is `true`, the RemoveHtmlTags converter removes
span HTML tags.
Default: false
Used by: RemoveHtmlTags converter
EOF
define(:header_offset, Integer, 0, <<EOF)
Sets the output offset for headers
If this option is c (may also be negative) then a header with level n
will be output as a header with level c+n. If c+n is lower than 1,
level 1 will be used. If c+n is greater than 6, level 6 will be used.
Default: 0
Used by: HTML converter, Kramdown converter, Latex converter
EOF
end
end
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