Class: Bespoke::Export::Filter::FunctionCall

Inherits:
Object
  • Object
show all
Defined in:
lib/bespoke/export/filter/function_call.rb

Constant Summary collapse

EXTRACTION_REGEXP = 
/\A(?<function>[^\(]+)\((?<args>[^\)]*)\)\z/
DEFAULT_CUSTOM_FUNCTIONS = 
{
  'random_str' => ->(args) { "LOWER(HEX(RANDOMBLOB(#{ args[0].to_i })))" },
}.with_indifferent_access

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string, custom_functions = {}) ⇒ FunctionCall

Returns a new instance of FunctionCall.



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# File 'lib/bespoke/export/filter/function_call.rb', line 23

def initialize(string, custom_functions={})
  @string = string.strip
  @custom_functions = DEFAULT_CUSTOM_FUNCTIONS.merge(custom_functions)
end

Instance Attribute Details

#custom_functions ⇒ Object (readonly)

Returns the value of attribute custom_functions.



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# File 'lib/bespoke/export/filter/function_call.rb', line 13

def custom_functions
  @custom_functions
end

Class Method Details

.extract_from(string, custom_functions = {}) ⇒ Object 



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# File 'lib/bespoke/export/filter/function_call.rb', line 19

def self.extract_from(string, custom_functions={})
  new(string, custom_functions).extract
end

.match?(string) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/bespoke/export/filter/function_call.rb', line 15

def self.match?(string)
  !!EXTRACTION_REGEXP.match(string.strip)
end

Instance Method Details

#arguments ⇒ Object

TODO: Make this type cast integers, booleans and possibly identifiers



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# File 'lib/bespoke/export/filter/function_call.rb', line 41

def arguments
  @arguments ||= call_parts[:args].split(',').map(&:strip)
end

#extract ⇒ Object 



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# File 'lib/bespoke/export/filter/function_call.rb', line 28

def extract
  if custom_function?
    Sequel.lit(compile_custom_function)
  else
    Sequel.function(function.upcase, *arguments)
  end
end

#function ⇒ Object 



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# File 'lib/bespoke/export/filter/function_call.rb', line 36

def function
  call_parts[:function]
end