Class: Function

Inherits:
Object
  • Object
show all
Defined in:
lib/yodel/models/core/functions/function.rb

Constant Summary collapse

CALL_TOKEN =

Compilation

'.'
START_PARAMS_TOKEN = 
'('
END_PARAMS_TOKEN = 
')'
START_HASH_TOKEN = 
'{'
END_HASH_TOKEN = 
'}'
PARAM_DELIM_TOKEN = 
','
HASH_DELIM_TOKEN = 
':'
ENTRY_FLAG = 
'!'
DOUBLE_QUOTE_TOKEN = 
'"'
SINGLE_QUOTE_TOKEN = 
"'"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(param) ⇒ Function

Returns a new instance of Function.



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# File 'lib/yodel/models/core/functions/function.rb', line 4

def initialize(param)
  if param.is_a?(String)
    @source = param
    @instructions = compile(param)
  else
    @instructions = param
  end
end

Instance Attribute Details

#instructions ⇒ Object

Returns the value of attribute instructions.



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# File 'lib/yodel/models/core/functions/function.rb', line 2

def instructions
  @instructions
end

#source ⇒ Object

Returns the value of attribute source.



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# File 'lib/yodel/models/core/functions/function.rb', line 2

def source
  @source
end

Instance Method Details

#compile(source) ⇒ Object 



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# File 'lib/yodel/models/core/functions/function.rb', line 43

def compile(source)
  tokens = source.scan(/[\w\-\+]+|\.|\(|\)|\{|\}|:|,|"(?:[^"\\]|\\.)*"|'(?:[^'\\]|\\.)*'/)
  parse(tokens)
end

#execute(context, instruction = nil, parent_context = nil) ⇒ Object

Execution



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# File 'lib/yodel/models/core/functions/function.rb', line 107

def execute(context, instruction=nil, parent_context=nil)
  instruction ||= self.instructions.first
  name, *params = instruction
  parent_context ||= context

  case name
  when 'chain'
    chain(context, parent_context, params)
  when 'field'
    get_field(context, parent_context, params.first)
  when 'find'
    find_record(context, parent_context, params[0], params[1])
  when 'changed'
    changed(context, parent_context, params.first)
  when 'previous_value'
    previous_value(context, parent_context, params.first)
  when 'collect'
    collect(context, parent_context, params.first)
  when 'flatten'
    flatten(context)
  when 'majority'
    majority(context, parent_context, params.first)
  when 'count'
    count(context, parent_context, params.first)
  when 'invert'
    invert(context)
  when 'unique'
    unique(context, parent_context, params.first)
  when 'average'
    average(context, parent_context, params)
  when 'as_a_percentage_of'
    as_a_percentage_of(context, parent_context, params.first)
  when 'present'
    present(context)
  when 'blank'
    blank(context)
  when 'sum'
    sum(context, parent_context, params)
  when 'subtract'
    subtract(context, parent_context, params)
  when 'multiply'
    multiply(context, parent_context, params)
  when 'round'
    round(context)
  when 'if'
    binary_if(context, parent_context, params[0], params[1], params[2])
  when 'greater_than'
    greater_than(context, parent_context, params.first)
  when 'greater_than_or_equal_to'
    greater_than_or_equal_to(context, parent_context, params.first)
  when 'less_than'
    less_than(context, parent_context, params.first)
  when 'less_than_or_equal_to'
    less_than_or_equal_to(context, parent_context, params.first)
  when 'not_equal'
    not_equal(context, parent_context, params.first)
  when 'and'
    binary_and(context, parent_context, params[0], params[1])
  when 'or'
    binary_or(context, parent_context, params[0], params[1])
  when 'include'
    set_include(context, parent_context, params.first)
  when 'strip'
    strip(context)
  when 'format'
    format(context, parent_context, params.first)
  when 'set'
    set_field(context, parent_context, params[0], params[1])
  when 'update'
    update_field(context, parent_context, params[0], params[1])
  when 'min'
    min(context, parent_context, params[0], params[1])
  when 'max'
    max(context, parent_context, params[0], params[1])
  when 'increment'
    increment(context, parent_context, params[0], params[1])
  when 'complement'
    complement(context, parent_context, params[0], params[1])
  when 'each'
    each(context, parent_context, params.first)
  when 'deliver'
    deliver_email(context, parent_context, params[0], params[1])
  when 'call_api'
    call_api(context, parent_context, params[0], params[1])
    
  # literals
  when 'string'
    params.first
  when 'int'
    params.first.to_i
  when 'hash'
    Hash[params.collect {|entry| execute(context, entry, parent_context)}]
  when 'entry'
    [execute(context, params.first, parent_context), execute(context, params.last, parent_context)]
  end
end

#inspect(instruction = nil) ⇒ Object 



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# File 'lib/yodel/models/core/functions/function.rb', line 13

def inspect(instruction=nil)
  instruction ||= self.instructions
  
  name = instruction.shift
  parameters = instruction.collect do |parameter|
    if parameter.is_a?(Array)
      inspect(parameter)
    else
      parameter
    end
  end

  "#{name}(#{parameters.join(', ')})"
end

#parse(tokens) ⇒ Object 



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# File 'lib/yodel/models/core/functions/function.rb', line 48

def parse(tokens)
  params = false
  chain  = false
  hash   = false
  instructions = []

  until tokens.empty?
    token = tokens.shift
    case token[0]
    when CALL_TOKEN
      chain = true
    when START_PARAMS_TOKEN
      params = true
      instructions += parse(tokens)
    when END_PARAMS_TOKEN
      tokens.unshift(END_PARAMS_TOKEN) unless params
      break
    when ENTRY_FLAG
      hash = true
      instructions << ['entry'] + parse(tokens)
    when START_HASH_TOKEN
      tokens.unshift(ENTRY_FLAG)
      instructions << ['hash'] + parse(tokens)
    when END_HASH_TOKEN
      tokens.unshift(END_HASH_TOKEN) if hash
      break
    when HASH_DELIM_TOKEN
      instructions += parse(tokens)
    when PARAM_DELIM_TOKEN
      if params || hash
        tokens.unshift(ENTRY_FLAG) if hash
        instructions += parse(tokens)
      else
        tokens.unshift(PARAM_DELIM_TOKEN)
        break
      end
    when DOUBLE_QUOTE_TOKEN, SINGLE_QUOTE_TOKEN
      instructions << ['string', token[1...-1]]
    else
      if tokens.first == START_PARAMS_TOKEN
        instructions << [token] + parse(tokens)
      elsif token.to_i.to_s == token
        instructions << ['int', token]
      else
        instructions << ['field', token]
      end
    end
  end

  if chain
    [['chain'] + instructions]
  else
    instructions
  end
end