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