Class: TracLang::Expression

Inherits:
Object
  • Object
show all
Defined in:
lib/trac_lang/expression.rb

Overview

Model of TRAC neutral string expression. An expression is an array of strings, corresponding to the arguments of a TRAC expression. Expressions are active if they were called by #(…) and not active (neutral) if they were called by ##(…).

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Expression

Creates new active expression.



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# File 'lib/trac_lang/expression.rb', line 21

def initialize
  @args = ['']
  @active = true
end

Instance Attribute Details

#active ⇒ Object Also known as: active?

Flag to tell if this expression is active or neutral. The result of active expressions are copied to the active string, while the result of neutral expressions are copied to the enclosing expression.



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# File 'lib/trac_lang/expression.rb', line 13

def active
  @active
end

#args ⇒ Object

List of arguments for this expression.



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# File 'lib/trac_lang/expression.rb', line 16

def args
  @args
end

Instance Method Details

#command ⇒ Object

Command for TRAC processor.



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# File 'lib/trac_lang/expression.rb', line 27

def command
  @args[0].downcase.to_sym
end

#concat(str) ⇒ Object

Adds a string to current argument of the expression.



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# File 'lib/trac_lang/expression.rb', line 37

def concat(str)
  @args.last.concat str
end

#newarg ⇒ Object

Signals a new argument is starting.



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# File 'lib/trac_lang/expression.rb', line 42

def newarg
  @args.push ''
end

#size ⇒ Object

Returns current number of arguments in expression.



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# File 'lib/trac_lang/expression.rb', line 47

def size
  @args.size
end

#to_s ⇒ Object

String version of expression, used when trace is on



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# File 'lib/trac_lang/expression.rb', line 52

def to_s
  (@active ? '#/' : '##/') + @args.join('*') + '/'
end

#trac_args ⇒ Object

Arguments for TRAC command.



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# File 'lib/trac_lang/expression.rb', line 32

def trac_args
  @args[1..-1]
end