Class: DrgDSL::AstBuilder

Inherits:

Parslet::Transform

• Object
• Parslet::Transform
• DrgDSL::AstBuilder

Defined in:

lib/drgdsl/ast_builder.rb

Class Method Summary

• .broken_ast?(ast) ⇒ Boolean

  Did we manage to build a correct AST?.

• .build(cst) ⇒ Node

  AST.

Class Method Details

.broken_ast?(ast) ⇒ Boolean

Did we manage to build a correct AST?

Returns:

• (Boolean)

# File 'lib/drgdsl/ast_builder.rb', line 51

def self.broken_ast?(ast)
  !ast.is_a?(Ast::Node)
end

.build(cst) ⇒ Node

Returns AST.

Parameters:

• cst (Hash) —

  CST-ish hash obtained from DrgParser.

Returns:

• (Node) —

  AST

Raises:

• (UnknownCstError) —

  when CST could not be converted to a correct AST.

# File 'lib/drgdsl/ast_builder.rb', line 42

def self.build(cst)
  ast = new.apply(cst)
  raise UnknownCstError.new(cst, ast) if broken_ast?(ast)
  ast
end