Class: FormatEngine::FormatSet

Inherits:
Object
  • Object
show all
Defined in:
lib/format_engine/format_spec/set.rb

Overview

A format engine set specification.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(format) ⇒ FormatSet

Setup a variable format specification.



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# File 'lib/format_engine/format_spec/set.rb', line 18

def initialize(format)
  @raw = format

  if format =~ /(\d+)(?=\[)/
    qualifier = "{1,#{$MATCH}}"
    @format   = $PREMATCH + "["
    set       = $POSTMATCH
  elsif format =~ /\[/
    qualifier = "+"
    @format   = $PREMATCH + $MATCH
    set       = $MATCH + $POSTMATCH
  else
    fail "Invalid set string #{format}"
  end

  @regex = Regexp.new("#{set}#{qualifier}")
end

Instance Attribute Details

#format ⇒ Object (readonly)

The fixed part of this set specification.



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# File 'lib/format_engine/format_spec/set.rb', line 7

def format
  @format
end

#regex ⇒ Object (readonly)

The regular expression part of this set specification.



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# File 'lib/format_engine/format_spec/set.rb', line 10

def regex
  @regex
end

Instance Method Details

#do_format(spec_info) ⇒ Object

Format onto the output string



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# File 'lib/format_engine/format_spec/set.rb', line 43

def do_format(spec_info)
  fail "The tag %{@raw} may not be used in formatting."
end

#do_parse(spec_info) ⇒ Object

Parse from the input string



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# File 'lib/format_engine/format_spec/set.rb', line 48

def do_parse(spec_info)
  spec_info.instance_exec(&spec_info.engine[self.format])
end

#inspect ⇒ Object

Inspect for debugging.



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# File 'lib/format_engine/format_spec/set.rb', line 53

def inspect
  "Set(#{format.inspect}, #{regex.inspect})"
end

#validate(engine) ⇒ Object

Is this variable supported by the engine?



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# File 'lib/format_engine/format_spec/set.rb', line 37

def validate(engine)
  fail "Unsupported tag = #{format.inspect}" unless engine[format]
  self
end

#width ⇒ Object

The width parameter. Handled internally so this is always zero.



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# File 'lib/format_engine/format_spec/set.rb', line 13

def width
  0
end