Class: Metrocot::TextPattern

Inherits:

BasePattern

• Object
• BasePattern
• Metrocot::TextPattern

Defined in:

lib/metrocot.rb

Overview

Matches a certain text string or regex pattern

Instance Attribute Summary

Attributes inherited from BasePattern

#matched, #metrocot, #name, #node_scraper, #pattern_no, #pred, #source, #succ

Class Method Summary

• .parse(s) ⇒ Object

Instance Method Summary

• #description ⇒ Object
• #each_match(match_range, match_map) ⇒ Object
• #initialize(source, text) ⇒ TextPattern constructor

  A new instance of TextPattern.

• #priority ⇒ Object

Methods inherited from BasePattern

#default_scanner, #dump, #dump_match_map, #log, #log_match_data, #optional, #with_scanned_match_data

Constructor Details

#initialize(source, text) ⇒ TextPattern

Returns a new instance of TextPattern.

# File 'lib/metrocot.rb', line 565

def initialize( source, text )
	super(source)
	@text = text
end

Class Method Details

.parse(s) ⇒ Object

# File 'lib/metrocot.rb', line 574

def self.parse( s ) 

	if s.index("$") == 0
		return self.new( "$", /[\r\n]/ )
	end

	if s.index("/") == 0

		r_s = ""
		s = s[1..-1]
		src = "/"
		while !s.empty?

			if s.index("/") == 0
				s = s[1..-1]
				src << "/"
				break
			elsif s.index("\\/") == 0
				s = s[2..-1]
				r_s << "/"
				src << "\\/"
			else
				r_s << s[0..0]
				src << s[0..0]
				s = s[1..-1]
			end

		end

		regexp = Regexp.compile( r_s )
		return self.new( src, regexp )

	end

	if s.index("\"") == 0

		r_s = ""
		s = s[1..-1]
		src = "\""
		while !s.empty?

			if s.index("\"") == 0
				s = s[1..-1]
				src << "\""
				break
			elsif s.index("\\\"") == 0
				s = s[2..-1]
				r_s << "\""
				src << "\\\""
			else
				r_s << s[0..0]
				src << s[0..0]
				s = s[1..-1]
			end

		end

		return self.new( src, r_s )
	end

end

Instance Method Details

#description ⇒ Object

# File 'lib/metrocot.rb', line 570

def description
	"text \"#{@text}\""
end

#each_match(match_range, match_map) ⇒ Object

# File 'lib/metrocot.rb', line 652

def each_match( match_range, match_map )

	super(match_range, match_map)

	match_index = match_range.start_index
	match_offset = match_range.start_offset


	# consume rest of first text node  

	hnodes = match_range.hnodes

	actual_match = nil

	while match_index < match_range.end_index || (match_index == match_range.end_index && match_offset < match_range.end_offset)

		while (match_index < match_range.end_index || (match_index == match_range.end_index && match_offset < match_range.end_offset)) && ! hnodes[match_index].text?
			log( "not text: ##{match_index} #{hnodes[match_index].class}" )
			match_index += 1
			match_offset = 0
		end

		unless (match_index < match_range.end_index || (match_index == match_range.end_index && match_offset < match_range.end_offset)) && hnodes[match_index].text?
			log( "no match found" )
			return nil
		end

		hnode_text = if match_index == match_range.end_index
			hnodes[match_index].inner_text[0...match_range.end_offset]
		else
			hnodes[match_index].inner_text
		end

		log( "trying text match on: #{hnode_text[match_offset .. -1]}" )

		next_match_offset = hnode_text.index( @text, match_offset )

		if next_match_offset.nil?
			log( "no match found for #{@text}" )
			match_index += 1
			match_offset = 0
			next
		end

		actual_match = if @text.is_a? Regexp
			hnode_text[next_match_offset..-1][@text]
		else
			@text
		end

		log( "next text match at #{match_index}.#{next_match_offset}: #{actual_match}" )

		match_start_offset = next_match_offset
		match_end_offset = match_start_offset + actual_match.size
					
		if match_end_offset >= hnode_text.size
			log( "matched entire string of #{match_end_offset - match_start_offset} chars" )
		else
			log( "matched first #{match_end_offset - match_start_offset} chars" )
		end

		result = with_scanned_match_data( match_map, actual_match ) { |match_map|
			yield( match_range.crop( match_index, match_start_offset, match_index, match_end_offset), match_map ) 
		}
		
		return result if result

		match_offset = match_end_offset

	end

	return nil
	
end

#priority ⇒ Object

# File 'lib/metrocot.rb', line 636

def priority
	if name
		if @text.is_a?(String)
			-4
		else
			-5
		end
	else
		if @text.is_a?(String)
			-2
		else
			-3
		end
	end
end