Class: Calyx::Production::NonTerminal

Inherits:

Object

• Object
• Calyx::Production::NonTerminal

Defined in:

lib/calyx/production/non_terminal.rb

Overview

A type of production rule that represents a non-terminal expansion, linking one rule to another.

Instance Method Summary

• #evaluate(rng) ⇒ Array

  Evaluate the non-terminal, using the registry to handle the expansion.

• #initialize(symbol, registry) ⇒ NonTerminal constructor

  Construct a non-terminal node, given the symbol to lookup and the registry to look it up in.

Constructor Details

#initialize(symbol, registry) ⇒ NonTerminal

Construct a non-terminal node, given the symbol to lookup and the registry to look it up in.

Parameters:

• symbol (Symbol)
• registry (Calyx::Registry)

# File 'lib/calyx/production/non_terminal.rb', line 11

def initialize(symbol, registry)
  @symbol = symbol.to_sym
  @registry = registry
end

Instance Method Details

#evaluate(rng) ⇒ Array

Evaluate the non-terminal, using the registry to handle the expansion.

Returns:

• (Array)

# File 'lib/calyx/production/non_terminal.rb', line 19

def evaluate(rng)
  [@symbol, @registry.expand(@symbol).evaluate(rng)]
end