Class: MountainBerryFields::Parser

Inherits:
Erubis::Eruby
  • Object
show all
Defined in:
lib/mountain_berry_fields/parser.rb

Overview

This class takes a document with erb in it It parses the erb and gives you back a file of source code When that source code is evaluated, you get the file out. The evaluation environment is expected to provide a ‘document` method or local variable, which is a string that the template will be appended to.

It differs from normal ERB in that you can pass it :visible and :invisible commands lists. Code inside of a block around an invisible command (method name) will not be added to the document. Any command invoked at the start of an erb block (<% and <%=) will be checked against the visible and invisible lists, if they are on either list, their block will return the text in the template that was written in the block.

Defined Under Namespace

Classes: Recording

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#invisible_commands ⇒ Object

Returns the value of attribute invisible_commands.



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# File 'lib/mountain_berry_fields/parser.rb', line 40

def invisible_commands
  @invisible_commands
end

#known_commands ⇒ Object

Returns the value of attribute known_commands.



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# File 'lib/mountain_berry_fields/parser.rb', line 40

def known_commands
  @known_commands
end

#recordings ⇒ Object

Returns the value of attribute recordings.



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# File 'lib/mountain_berry_fields/parser.rb', line 40

def recordings
  @recordings
end

#visible_commands ⇒ Object

Returns the value of attribute visible_commands.



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# File 'lib/mountain_berry_fields/parser.rb', line 40

def visible_commands
  @visible_commands
end

Instance Method Details

#add_expr_literal(src, code) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 85

def add_expr_literal(src, code)
  manage_recording src, code
  super
end

#add_postamble(src) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 54

def add_postamble(src)
  src << "#{@bufvar} << %(\\n) unless #{@bufvar}.end_with? %(\\n);"
  src << "document << #{@bufvar};"
end

#add_preamble(src) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 50

def add_preamble(src)
  super
end

#add_stmt(src, code) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 80

def add_stmt(src, code)
  manage_recording src, code
  super
end

#add_text(src, text) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 63

def add_text(src, text)
  recordings.last.record text
  super if recordings.last.visible?
end

#end_command?(code_with_command) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mountain_berry_fields/parser.rb', line 76

def end_command?(code_with_command)
  code_with_command =~ /\A\s*(end|})/
end

#init_generator(properties = {}) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 42

def init_generator(properties={})
  self.recordings         = [Recording.new(false)]
  self.visible_commands   = (properties.delete(:visible)   || []).map &:to_s
  self.invisible_commands = (properties.delete(:invisible) || []).map &:to_s
  self.known_commands     = visible_commands + invisible_commands
  super
end

#known_command?(code_with_command) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mountain_berry_fields/parser.rb', line 68

def known_command?(code_with_command)
  known_commands.include? code_with_command[/\w+/]
end

#manage_recording(src, code) ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 90

def manage_recording(src, code)
  if known_command? code
    recordings << Recording.new(true, visible_command?(code))
  elsif end_command? code
    recording = recordings.pop
    src << recording.recorded.inspect << ";" if recording.command?
  else
    recordings << Recording.new(false)
  end
end

#parse ⇒ Object 



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# File 'lib/mountain_berry_fields/parser.rb', line 59

def parse
  src
end

#visible_command?(code_with_command) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mountain_berry_fields/parser.rb', line 72

def visible_command?(code_with_command)
  visible_commands.include? code_with_command[/\w+/]
end