Class: SpotFeel::Dmn::LiteralExpression

Inherits:
Object
  • Object
show all
Defined in:
lib/spot_feel/dmn/literal_expression.rb

Direct Known Subclasses

UnaryTests

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id: nil, text:) ⇒ LiteralExpression

Returns a new instance of LiteralExpression.



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 12

def initialize(id: nil, text:)
  @id = id
  @text = text&.strip
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 6

def id
  @id
end

#text ⇒ Object (readonly)

Returns the value of attribute text.



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 6

def text
  @text
end

Class Method Details

.builtin_functions ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 84

def self.builtin_functions
  HashWithIndifferentAccess.new({
    # Conversion functions
    "string": ->(from) { 
      return if from.nil?
      from.to_s 
    },
    "number": ->(from) { 
      return if from.nil?
      from.include?(".") ? from.to_f : from.to_i 
    },
    # Boolean functions
    # "not": ->(value) { value == true ? false : true },
    "is defined": ->(value) { 
      return if value.nil?
      !value.nil? 
    },
    "get or else": ->(value, default) { 
      value.nil? ? default : value 
    },
    # String functions
    "substring": ->(string, start, length) { 
      return if string.nil? || start.nil?
      return "" if length.nil?
      string[start - 1, length] 
    },
    "substring before": ->(string, match) { 
      return if string.nil? || match.nil?
      string.split(match).first 
    },
    "substring after": ->(string, match) { 
      return if string.nil? || match.nil?
      string.split(match).last 
    },
    "string length": ->(string) { 
      return if string.nil?
      string.length 
    },
    "upper case": ->(string) { 
      return if string.nil?
      string.upcase
    },
    "lower case": -> (string) { 
      return if string.nil?
      string.downcase 
    },
    "contains": ->(string, match) { 
      return if string.nil? || match.nil?
      string.include?(match) 
    },
    "starts with": ->(string, match) { 
      return if string.nil? || match.nil?
      string.start_with?(match) 
    },
    "ends with": ->(string, match) { 
      return if string.nil? || match.nil?
      string.end_with?(match) 
    },
    "matches": ->(string, match) { 
      return if string.nil? || match.nil?
      string.match?(match) 
    },
    "replace": ->(string, match, replacement) { 
      return if string.nil? || match.nil? || replacement.nil?
      string.gsub(match, replacement) 
    },
    "split": ->(string, match) { 
      return if string.nil? || match.nil?
      string.split(match) 
    },
    "strip": -> (string) { 
      return if string.nil?
      string.strip 
    },
    "extract": -> (string, pattern) {
      return if string.nil? || pattern.nil?
      string.match(pattern).captures 
    },
    # Numeric functions
    "decimal": ->(n, scale) { 
      return if n.nil? || scale.nil?
      n.round(scale) 
    },
    "floor": ->(n) {
      return if n.nil?
      n.floor 
    },
    "ceiling": ->(n) { 
      return if n.nil?
      n.ceil 
    },
    "round up": ->(n) { 
      return if n.nil?
      n.ceil 
    },
    "round down": ->(n) { 
      return if n.nil?
      n.floor 
    },
    "abs": ->(n) { 
      return if n.nil?
      n.abs 
    },
    "modulo": ->(n, divisor) { 
      return if n.nil? || divisor.nil?
      n % divisor 
    },
    "sqrt": ->(n) { 
      return if n.nil?
      Math.sqrt(n) 
    },
    "log": ->(n) { 
      return if n.nil?
      Math.log(n) 
    },
    "exp": ->(n) { 
      return if n.nil?
      Math.exp(n) 
    },
    "odd": ->(n) { 
      return if n.nil?
      n.odd? 
    },
    "even": ->(n) { 
      return if n.nil?
      n.even? 
    },
    "random number": ->(n) { 
      return if n.nil?
      rand(n) 
    },
    # List functions
    "list contains": ->(list, match) { 
      return if list.nil?
      return false if match.nil?
      list.include?(match) 
    },
    "count": ->(list) { 
      return if list.nil?
      return 0 if list.empty?
      list.length 
    },
    "min": ->(list) { 
      return if list.nil?
      list.min 
    },
    "max": ->(list) { 
      return if list.nil?
      list.max 
    },
    "sum": ->(list) { 
      return if list.nil?
      list.sum 
    },
    "product": ->(list) { 
      return if list.nil?
      list.inject(:*) 
    },
    "mean": ->(list) {
      return if list.nil?
      list.sum / list.length 
    },
    "median": ->(list) {
      return if list.nil?
      list.sort[list.length / 2] 
    },
    "stddev": ->(list) {
      return if list.nil?
      mean = list.sum / list.length.to_f
      Math.sqrt(list.map { |n| (n - mean)**2 }.sum / list.length)
    },
    "mode": ->(list) { 
      return if list.nil?
      list.group_by(&:itself).values.max_by(&:size).first 
    },
    "all": ->(list) {
      return if list.nil?
      list.all? 
    },
    "any": ->(list) {
      return if list.nil?
      list.any? 
    },
    "sublist": ->(list, start, length) { 
      return if list.nil? || start.nil?
      return [] if length.nil?
      list[start - 1, length] 
    },
    "append": ->(list, item) { 
      return if list.nil?
      list + [item] 
    },
    "concatenate": ->(list1, list2) { 
      return [nil, nil] if list1.nil? && list2.nil?
      return [nil] + list2 if list1.nil?
      return list1 + [nil] if list2.nil? 
      Array.wrap(list1) + Array.wrap(list2)
    },
    "insert before": ->(list, position, item) { 
      return if list.nil? || position.nil?
      list.insert(position - 1, item) 
    },
    "remove": ->(list, position) { 
      return if list.nil? || position.nil?
      list.delete_at(position - 1); list 
    },
    "reverse": ->(list) { 
      return if list.nil?
      list.reverse 
    },
    "index of": ->(list, match) { 
      return if list.nil?
      return [] if match.nil?
      list.index(match) + 1 
    },
    "union": ->(list1, list2) { 
      return if list1.nil? || list2.nil?
      list1 | list2 
    },
    "distinct values": ->(list) { 
      return if list.nil?
      list.uniq 
    },
    "duplicate values": ->(list) { 
      return if list.nil?
      list.select { |e| list.count(e) > 1 }.uniq 
    },
    "flatten": ->(list) { 
      return if list.nil?
      list.flatten 
    },
    "sort": ->(list) { 
      return if list.nil?
      list.sort 
    },
    "string join": ->(list, separator) { 
      return if list.nil?
      list.join(separator) 
    },
    # Context functions
    "get value": ->(context, name) { 
      return if context.nil? || name.nil?
      context[name] 
    },
    "context put": ->(context, name, value) { 
      return if context.nil? || name.nil?
      context[name] = value; context 
    },
    "context merge": ->(context1, context2) { 
      return if context1.nil? || context2.nil?
      context1.merge(context2) 
    },
    "get entries": ->(context) { 
      return if context.nil?
      context.entries 
    },
    # Temporal functions
    "now": ->() { Time.now },
    "today": ->() { Date.today },
    "day of week": ->(date) { 
      return if date.nil?
      date.wday 
    },
    "day of year": ->(date) { 
      return if date.nil?
      date.yday 
    },
    "week of year": ->(date) { 
      return if date.nil?
      date.cweek 
    },
    "month of year": ->(date) { 
      return if date.nil?
      date.month 
    },
  })
end

.from_json(json) ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 8

def self.from_json(json)
  LiteralExpression.new(id: json[:id], text: json[:text])
end

Instance Method Details

#as_json ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 362

def as_json
  {
    id: id,
    text: text,
  }
end

#evaluate(variables = {}) ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 26

def evaluate(variables = {})
  tree.eval(functions.merge(variables))
end

#functions ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 30

def functions
  builtins = LiteralExpression.builtin_functions
  custom = (SpotFeel.config.functions || {})
  ActiveSupport::HashWithIndifferentAccess.new(builtins.merge(custom))
end

#named_functions ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 36

def named_functions
  # Initialize a set to hold the qualified names
  function_names = Set.new

  # Define a lambda for the recursive function
  walk_tree = lambda do |node|
    # If the node is a qualified name, add it to the set
    if node.is_a?(SpotFeel::FunctionInvocation)
      function_names << node.fn_name.text_value
    end

    # Recursively walk the child nodes
    node.elements&.each do |child|
      walk_tree.call(child)
    end
  end

  # Start walking the tree from the root
  walk_tree.call(tree)

  # Return the array of functions
  function_names.to_a
end

#named_variables ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 60

def named_variables
  # Initialize a set to hold the qualified names
  qualified_names = Set.new

  # Define a lambda for the recursive function
  walk_tree = lambda do |node|
    # If the node is a qualified name, add it to the set
    if node.is_a?(SpotFeel::QualifiedName)
      qualified_names << node.text_value
    end

    # Recursively walk the child nodes
    node.elements&.each do |child|
      walk_tree.call(child)
    end
  end

  # Start walking the tree from the root
  walk_tree.call(tree)

  # Return the array of qualified names
  qualified_names.to_a
end

#tree ⇒ Object 



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# File 'lib/spot_feel/dmn/literal_expression.rb', line 17

def tree
  @tree ||= SpotFeel::Parser.parse(text)
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/spot_feel/dmn/literal_expression.rb', line 21

def valid?
  return false if text.blank?
  tree.present?
end