Class: Expressir::Express::Builders::RuleDeclBuilder

Inherits:
Object
  • Object
show all
Defined in:
lib/expressir/express/builders/rule_decl_builder.rb

Overview

Builds rule declaration nodes.

Instance Method Summary collapse

Instance Method Details

#call(ast_data) ⇒ Object 



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# File 'lib/expressir/express/builders/rule_decl_builder.rb', line 8

def call(ast_data)
  head = ast_data[:rule_head]
  algorithm_head = ast_data[:algorithm_head]
  stmts = ast_data[:stmt]
  where_clause = ast_data[:where_clause]

  id = Builder.build_optional(head[:rule_id]) if head
  applies_to = build_applies_to(head)

  declarations = []
  if algorithm_head.is_a?(Hash)
    declarations = Builder.build_children(algorithm_head[:declaration])
  end

  types = declarations.grep(Expressir::Model::Declarations::Type)
  entities = declarations.grep(Expressir::Model::Declarations::Entity)
  subtype_constraints = declarations.grep(Expressir::Model::Declarations::SubtypeConstraint)
  functions = declarations.grep(Expressir::Model::Declarations::Function)
  procedures = declarations.grep(Expressir::Model::Declarations::Procedure)
  constants = if algorithm_head.is_a?(Hash) && algorithm_head[:constant_decl]
                build_constant_decl(algorithm_head[:constant_decl])
              else
                []
              end
  variables = if algorithm_head.is_a?(Hash) && algorithm_head[:local_decl]
                build_local_decl(algorithm_head[:local_decl])
              else
                []
              end
  statements = Builder.build_children(stmts)
  where_rules = where_clause ? Builder.build({ where_clause: where_clause }) : []

  Expressir::Model::Declarations::Rule.new(
    id: id,
    applies_to: Builder.ensure_array(applies_to),
    types: types,
    entities: entities,
    subtype_constraints: subtype_constraints,
    functions: functions,
    procedures: procedures,
    constants: constants,
    variables: variables,
    statements: statements.compact,
    where_rules: [where_rules].flatten,
  )
end