Class: Newstile::Parser::Html::ElementConverter
Overview
Converts HTML elements to native elements if possible.
Constant Summary
collapse
- REMOVE_TEXT_CHILDREN =
%w{html head hgroup ol ul dl table colgroup tbody thead tfoot tr select optgroup}
- WRAP_TEXT_CHILDREN =
%w{body section nav article aside header footer address div li dd blockquote figure
figcaption fieldset form}
- REMOVE_WHITESPACE_CHILDREN =
%w{body section nav article aside header footer address
div li dd blockquote figure figcaption td th fieldset form}
- STRIP_WHITESPACE =
%w{address article aside blockquote body caption dd div dl dt fieldset figcaption form footer
header h1 h2 h3 h4 h5 h6 legend li nav p section td th}
- SIMPLE_ELEMENTS =
%w{em strong blockquote hr br img p thead tbody tfoot tr td th ul ol dl li dl dt dd}
Utils::Entities::ENTITY_MAP, Utils::Entities::ENTITY_TABLE
Constants included
from Constants
Constants::HTML_ATTRIBUTE_RE, Constants::HTML_BLOCK_ELEMENTS, Constants::HTML_COMMENT_RE, Constants::HTML_DOCTYPE_RE, Constants::HTML_ELEMENTS_WITHOUT_BODY, Constants::HTML_ENTITY_RE, Constants::HTML_INSTRUCTION_RE, Constants::HTML_PARSE_AS, Constants::HTML_PARSE_AS_BLOCK, Constants::HTML_PARSE_AS_RAW, Constants::HTML_PARSE_AS_SPAN, Constants::HTML_SPAN_ELEMENTS, Constants::HTML_TAG_CLOSE_RE, Constants::HTML_TAG_RE
Instance Method Summary
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-
#convert_a(el) ⇒ Object
-
#convert_b(el) ⇒ Object
-
#convert_code(el) ⇒ Object
(also: #convert_pre)
-
#convert_div(el) ⇒ Object
(also: #convert_span)
-
#convert_h1(el) ⇒ Object
-
#convert_i(el) ⇒ Object
-
#convert_table(el) ⇒ Object
-
#extract_text(el, raw) ⇒ Object
-
#handle_math_tag(el) ⇒ Object
-
#initialize(doc) ⇒ ElementConverter
constructor
A new instance of ElementConverter.
-
#is_math_tag?(el) ⇒ Boolean
-
#is_simple_table?(el) ⇒ Boolean
-
#process(el, do_conversion = true, preserve_text = false, parent = nil) ⇒ Object
Convert the element el
and its children.
-
#process_children(el, do_conversion = true, preserve_text = false) ⇒ Object
-
#process_html_element(el, do_conversion = true, preserve_text = false) ⇒ Object
-
#process_text(raw, preserve = false) ⇒ Object
Process the HTML text raw
: compress whitespace (if preserve
is false
) and convert entities in entity elements.
-
#remove_text_children(el) ⇒ Object
-
#remove_whitespace_children(el) ⇒ Object
-
#set_basics(el, type, category, opts = {}) ⇒ Object
-
#strip_whitespace(el) ⇒ Object
-
#wrap_text_children(el) ⇒ Object
entity
Constructor Details
Returns a new instance of ElementConverter.
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# File 'lib/newstile/parser/html.rb', line 175
def initialize(doc)
@doc = doc
end
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Instance Method Details
#convert_a(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 315
def convert_a(el)
if el.attr['href']
set_basics(el, :a, :span)
process_children(el)
else
process_html_element(el, false)
end
end
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#convert_b(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 324
def convert_b(el)
set_basics(el, :strong, :span)
process_children(el)
end
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#convert_code(el) ⇒ Object
Also known as:
convert_pre
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# File 'lib/newstile/parser/html.rb', line 343
def convert_code(el)
raw = ''
(el, raw)
result = process_text(raw, true)
begin
str = result.inject('') do |mem, c|
if c.type == :text
mem << c.value
elsif c.type == :entity
if RUBY_VERSION >= '1.9'
mem << c.value.char.encode(@doc.parse_infos[:encoding])
elsif [60, 62, 34, 38].include?(c.value.code_point)
mem << c.value.code_point.chr
end
elsif c.type == :smart_quote || c.type == :typographic_sym
mem << entity(c.value.to_s).char.encode(@doc.parse_infos[:encoding])
else
raise "Bug - please report"
end
end
result.clear
result << Element.new(:text, str)
rescue
end
if result.length > 1 || result.first.type != :text
process_html_element(el, false, true)
else
if el.value == 'code'
set_basics(el, :codespan, :span)
else
set_basics(el, :codeblock, :block)
end
el.value = result.first.value
el.children.clear
end
end
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#convert_div(el) ⇒ Object
Also known as:
convert_span
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# File 'lib/newstile/parser/html.rb', line 430
def convert_div(el)
if !is_math_tag?(el)
process_html_element(el)
else
handle_math_tag(el)
end
end
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#convert_h1(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 334
def convert_h1(el)
set_basics(el, :header, :block, :level => el.value[1..1].to_i)
(el, el.options[:raw_text] = '')
process_children(el)
end
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#convert_i(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 329
def convert_i(el)
set_basics(el, :em, :span)
process_children(el)
end
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#convert_table(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 381
def convert_table(el)
if !is_simple_table?(el)
process_html_element(el, false)
return
end
process_children(el)
set_basics(el, :table, :block)
el.options[:alignment] = []
calc_alignment = lambda do |c|
if c.type == :tr && el.options[:alignment].empty?
el.options[:alignment] = [:default] * c.children.length
break
else
c.children.each {|cc| calc_alignment.call(cc)}
end
end
calc_alignment.call(el)
if el.children.first.type == :tr
tbody = Element.new(:tbody, nil, nil, :category => :block)
tbody.children = el.children
el.children = [tbody]
end
end
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# File 'lib/newstile/parser/html.rb', line 310
def (el, raw)
raw << el.value.to_s if el.type == :text
el.children.each {|c| (c, raw)}
end
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#handle_math_tag(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 444
def handle_math_tag(el)
set_basics(el, :math, (el.value == 'div' ? :block : :span))
el.value = el.children.shift.value
if el.attr['class'] =~ /^\s*math\s*$/
el.attr.delete('class')
else
el.attr['class'].sub!(/\s?math/, '')
end
el.value.gsub!(/&(amp|quot|gt|lt);/) do |m|
case m
when '&' then '&'
when '"' then '"'
when '>' then '>'
when '<' then '<'
end
end
end
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#is_math_tag?(el) ⇒ Boolean
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# File 'lib/newstile/parser/html.rb', line 439
def is_math_tag?(el)
el.attr['class'].to_s =~ /\bmath\b/ &&
el.children.size == 1 && el.children.first.type == :text
end
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#is_simple_table?(el) ⇒ Boolean
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# File 'lib/newstile/parser/html.rb', line 405
def is_simple_table?(el)
only_phrasing_content = lambda do |c|
c.children.all? do |cc|
(cc.type == :text || !HTML_BLOCK_ELEMENTS.include?(cc.value)) && only_phrasing_content.call(cc)
end
end
check_cells = Proc.new do |c|
if c.value == 'th' || c.value == 'td'
return false if !only_phrasing_content.call(c)
else
c.children.each {|cc| check_cells.call(cc)}
end
end
check_cells.call(el)
check_rows = lambda do |t, type|
t.children.all? {|r| (r.value == 'tr' || r.type == :text) && r.children.all? {|c| c.value == type || c.type == :text}}
end
check_rows.call(el, 'td') ||
(el.children.all? do |t|
t.type == :text || (t.value == 'thead' && check_rows.call(t, 'th')) ||
((t.value == 'tfoot' || t.value == 'tbody') && check_rows.call(t, 'td'))
end && el.children.any? {|t| t.value == 'tbody'})
end
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#process(el, do_conversion = true, preserve_text = false, parent = nil) ⇒ Object
Convert the element el
and its children.
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# File 'lib/newstile/parser/html.rb', line 180
def process(el, do_conversion = true, preserve_text = false, parent = nil)
case el.type
when :xml_comment, :xml_pi, :html_doctype
ptype = if parent.nil?
'div'
else
case parent.type
when :html_element then parent.value
when :code_span then 'code'
when :code_block then 'pre'
when :header then 'h1'
else parent.type.to_s
end
end
el.options = {:category => HTML_PARSE_AS_SPAN.include?(ptype) ? :span : :block}
return
when :html_element
else return
end
type = el.value
remove_text_children(el) if REMOVE_TEXT_CHILDREN.include?(type)
mname = "convert_#{el.value}"
if do_conversion && self.class.method_defined?(mname)
send(mname, el)
elsif do_conversion && SIMPLE_ELEMENTS.include?(type)
set_basics(el, type.intern, HTML_SPAN_ELEMENTS.include?(type) ? :span : :block)
process_children(el, do_conversion, preserve_text)
else
process_html_element(el, do_conversion, preserve_text)
end
strip_whitespace(el) if STRIP_WHITESPACE.include?(type)
remove_whitespace_children(el) if REMOVE_WHITESPACE_CHILDREN.include?(type)
wrap_text_children(el) if WRAP_TEXT_CHILDREN.include?(type)
end
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#process_children(el, do_conversion = true, preserve_text = false) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 218
def process_children(el, do_conversion = true, preserve_text = false)
el.children.map! do |c|
if c.type == :text
process_text(c.value, preserve_text)
else
process(c, do_conversion, preserve_text, el)
c
end
end.flatten!
end
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#process_html_element(el, do_conversion = true, preserve_text = false) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 254
def process_html_element(el, do_conversion = true, preserve_text = false)
el.options = {:category => HTML_SPAN_ELEMENTS.include?(el.value) ? :span : :block,
:parse_type => HTML_PARSE_AS[el.value]
}
process_children(el, do_conversion, preserve_text)
end
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#process_text(raw, preserve = false) ⇒ Object
Process the HTML text raw
: compress whitespace (if preserve
is false
) and convert entities in entity elements.
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# File 'lib/newstile/parser/html.rb', line 231
def process_text(raw, preserve = false)
raw.gsub!(/\s+/, ' ') unless preserve
src = StringScanner.new(raw)
result = []
while !src.eos?
if tmp = src.scan_until(/(?=#{HTML_ENTITY_RE})/)
result << Element.new(:text, tmp)
src.scan(HTML_ENTITY_RE)
val = src[1] || (src[2] && src[2].to_i) || src[3].hex
result << if %w{lsquo rsquo ldquo rdquo}.include?(val)
Element.new(:smart_quote, val.intern)
elsif %w{mdash ndash hellip laquo raquo}.include?(val)
Element.new(:typographic_sym, val.intern)
else
Element.new(:entity, entity(val), nil, :original => src.matched)
end
else
result << Element.new(:text, src.scan(/.*/m))
end
end
result
end
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#remove_text_children(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 261
def remove_text_children(el)
el.children.delete_if {|c| c.type == :text}
end
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#remove_whitespace_children(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 294
def remove_whitespace_children(el)
i = -1
el.children.delete_if do |c|
i += 1
c.type == :text && c.value.strip.empty? &&
(i == 0 || i == el.children.length - 1 || (el.children[i-1].options[:category] == :block &&
el.children[i+1].options[:category] == :block))
end
end
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#set_basics(el, type, category, opts = {}) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 304
def set_basics(el, type, category, opts = {})
el.type = type
el.options = {:category => category}.merge(opts)
el.value = nil
end
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#strip_whitespace(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 284
def strip_whitespace(el)
return if el.children.empty?
if el.children.first.type == :text
el.children.first.value.lstrip!
end
if el.children.last.type == :text
el.children.last.value.rstrip!
end
end
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#wrap_text_children(el) ⇒ Object
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# File 'lib/newstile/parser/html.rb', line 265
def wrap_text_children(el)
tmp = []
last_is_p = false
el.children.each do |c|
if c.options[:category] != :block || c.type == :text
if !last_is_p
tmp << Element.new(:p, nil, nil, :transparent => true)
last_is_p = true
end
tmp.last.children << c
tmp
else
tmp << c
last_is_p = false
end
end
el.children = tmp
end
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