Class: Mxrb::Runtime::Native::Expression

Inherits:
Object
  • Object
show all
Defined in:
lib/mxrb/runtime/native.rb

Overview

Deliberately small Mendix-expression evaluator. Unsupported syntax is rejected rather than guessed, preserving deterministic test semantics.

Constant Summary collapse

COMPARISONS = 
{
  '=' => ->(left, right) { left == right },
  '!=' => ->(left, right) { left != right },
  '>' => ->(left, right) { left > right },
  '<' => ->(left, right) { left < right },
  '>=' => ->(left, right) { left >= right },
  '<=' => ->(left, right) { left <= right }
}.freeze

Instance Method Summary collapse

Instance Method Details

#evaluate(source, variables, node: nil) ⇒ Object 



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# File 'lib/mxrb/runtime/native.rb', line 60

def evaluate(source, variables, node: nil)
  text = strip_outer_parentheses(unwrap(source).strip)
  return nil if text.empty? || text == 'empty'
  return true if text.casecmp?('true')
  return false if text.casecmp?('false')
  return text[1...-1].gsub("''", "'") if quoted?(text)
  return Integer(text) if text.match?(/\A-?\d+\z/)
  return Float(text) if text.match?(/\A-?\d+\.\d+\z/)
  return variable(text, variables) if text.match?(%r{\A\$[A-Za-z_]\w*(?:/[A-Za-z_][\w.]*)?\z})
  return node_member(text, node) if node && bare_reference?(text)

  logical(text, variables) { |part| evaluate(part, variables, node:) }
rescue ArgumentError, TypeError
  raise NativeRuntimeError, "unsupported Mendix expression: #{source.inspect}"
end