Class: ERB::Compiler::TrimScanner

Inherits:
Scanner
  • Object
show all
Defined in:
lib/erb.rb

Overview

:nodoc:

Constant Summary collapse

TrimSplitRegexp = 
/(<%%)|(%%>)|(<%=)|(<%#)|(<%)|(%>\n)|(%>)|(\n)/
ExplicitTrimRegexp = 
/(^[ \t]*<%-)|(-%>\n?\z)|(<%-)|(-%>)|(<%%)|(%%>)|(<%=)|(<%#)|(<%)|(%>)|(\n)/
ERB_STAG = 
%w(<%= <%# <%)

Constants inherited from Scanner

Scanner::SplitRegexp

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Scanner

default_scanner=, make_scanner, regist_scanner

Constructor Details

#initialize(src, trim_mode, percent) ⇒ TrimScanner

Returns a new instance of TrimScanner.



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# File 'lib/erb.rb', line 288

def initialize(src, trim_mode, percent)
  super
  @trim_mode = trim_mode
  @percent = percent
  if @trim_mode == '>'
    @scan_line = self.method(:trim_line1)
  elsif @trim_mode == '<>'
    @scan_line = self.method(:trim_line2)
  elsif @trim_mode == '-'
    @scan_line = self.method(:explicit_trim_line)
  else
    @scan_line = self.method(:scan_line)
  end
end

Instance Attribute Details

#stag ⇒ Object

Returns the value of attribute stag.



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# File 'lib/erb.rb', line 302

def stag
  @stag
end

Instance Method Details

#explicit_trim_line(line) ⇒ Object 



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# File 'lib/erb.rb', line 369

def explicit_trim_line(line)
  line.split(ExplicitTrimRegexp).each do |token|
    next if token.empty?
    if @stag.nil? && /[ \t]*<%-/ =~ token
      yield('<%')
    elsif @stag && /-%>\n/ =~ token
      yield('%>')
      yield(:cr)
    elsif @stag && token == '-%>'
      yield('%>')
    else
      yield(token)
    end
  end
end

#is_erb_stag?(s) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/erb.rb', line 386

def is_erb_stag?(s)
  ERB_STAG.member?(s)
end

#percent_line(line, &block) ⇒ Object 



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# File 'lib/erb.rb', line 318

def percent_line(line, &block)
  if @stag || line[0] != ?%
    return @scan_line.call(line, &block)
  end

  line[0] = ''
  if line[0] == ?%
    @scan_line.call(line, &block)
  else
    yield(PercentLine.new(line.chomp))
  end
end

#scan(&block) ⇒ Object 



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# File 'lib/erb.rb', line 304

def scan(&block)
  @stag = nil
  if @percent
    @src.each do |line|
      percent_line(line, &block)
    end
  else
    @src.each do |line|
      @scan_line.call(line, &block)
    end
  end
  nil
end

#scan_line(line) ⇒ Object 



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# File 'lib/erb.rb', line 331

def scan_line(line)
  line.split(SplitRegexp).each do |token|
    next if token.empty?
    yield(token)
  end
end

#trim_line1(line) ⇒ Object 



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# File 'lib/erb.rb', line 338

def trim_line1(line)
  line.split(TrimSplitRegexp).each do |token|
    next if token.empty?
    if token == "%>\n"
      yield('%>')
      yield(:cr)
      break
    end
    yield(token)
  end
end

#trim_line2(line) ⇒ Object 



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# File 'lib/erb.rb', line 350

def trim_line2(line)
  head = nil
  line.split(TrimSplitRegexp).each do |token|
    next if token.empty?
    head = token unless head
    if token == "%>\n"
      yield('%>')
      if  is_erb_stag?(head)
 yield(:cr)
      else
 yield("\n")
      end
      break
    end
    yield(token)
  end
end