Module: Flexr::Generated

Defined in:
lib/flexr/generated.rb

Constant Summary collapse

ARTIFACT_SCHEMA_VERSION = 
1
RUNTIME_ABI_VERSION = 
1

Class Method Summary collapse

Class Method Details

.artifact_metadata ⇒ Object 



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# File 'lib/flexr/generated.rb', line 10

def artifact_metadata
  {
    schema_version: ARTIFACT_SCHEMA_VERSION,
    compiler_version: VERSION,
    runtime_abi_version: RUNTIME_ABI_VERSION,
    unicode_version: Unicode::VERSION
  }
end

.decode_array(encoded, nil_value: nil) ⇒ Object 



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# File 'lib/flexr/generated.rb', line 122

def decode_array(encoded, nil_value: nil)
  values = encoded.unpack1("m0").unpack("l<*")
  return values unless nil_value

  values.map { |value| value == nil_value ? nil : value }
end

.decode_packed(packed) ⇒ Object 



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# File 'lib/flexr/generated.rb', line 110

def decode_packed(packed)
  return packed unless packed.is_a?(Hash) && packed[:encoding]&.to_sym == :base64

  {
    base: decode_array(packed.fetch(:base)),
    default: decode_array(packed.fetch(:default), nil_value: -1),
    next: decode_array(packed.fetch(:next), nil_value: -1),
    check: decode_array(packed.fetch(:check), nil_value: -1),
    fallback: packed.key?(:fallback) ? decode_array(packed.fetch(:fallback), nil_value: -1) : nil
  }
end

.incompatible_artifact!(detail) ⇒ Object

Raises:



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# File 'lib/flexr/generated.rb', line 102

def incompatible_artifact!(detail)
  diagnostic = Diagnostics.error(
    "FLEXR-E020", "generated artifact is incompatible with this runtime",
    help: "regenerate the lexer with the installed flexr version", note: detail
  )
  raise CompileError.new(diagnostic.message, diagnostic: diagnostic)
end

.install!(klass, payload) ⇒ Object 



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# File 'lib/flexr/generated.rb', line 19

def install!(klass, payload)
  rules = payload.fetch(:rules)
  config = payload
  klass.__flexr_reset!
  klass.backend(config.fetch(:backend, :table))
  klass.token_kind(config.fetch(:token_kind, :array))
  klass.encoding(config.fetch(:encoding, Encoding::UTF_8))
  Array(config[:declared_tokens]).each { |token| klass.emits(token) }
  config.fetch(:options, {}).each do |option, value|
    if option == :accel
      klass.accel(value)
    elsif value == true
      klass.option(option)
    else
      klass.__flexr_config.options[option] = value
    end
  end
  Array(config[:states]).each do |state|
    klass.state(state, inclusive: config.fetch(:inclusive_states, {}).fetch(state.to_sym, false)) { nil }
  end
  rules.each do |definition|
    klass.__flexr_add_generated_rule(definition)
  end
  config.fetch(:eof_rules, {}).each do |state, action|
    klass.__flexr_add_generated_eof(state, action)
  end
  klass
end

.install_compiled!(klass, payload) ⇒ Object 



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# File 'lib/flexr/generated.rb', line 48

def install_compiled!(klass, payload)
  validate_artifact!(payload[:artifact])
  install!(klass, payload)
  machines = payload.fetch(:compiled).fetch(:machines).transform_values do |machine|
    dfa_data = machine.fetch(:dfa)
    packed = decode_packed(dfa_data[:packed])
    dfa = Automaton::DFA.new(
      transitions: dfa_data[:transitions],
      accepts: dfa_data.fetch(:accepts),
      ec: dfa_data.fetch(:ec),
      class_count: dfa_data.fetch(:class_count),
      start: dfa_data.fetch(:start),
      rule_ids: dfa_data.fetch(:rule_ids),
      packed: packed,
      direct: dfa_data[:direct],
      state_count: dfa_data.fetch(:state_count)
    )
    Automaton::Machine.new(dfa: dfa, state_name: machine.fetch(:state_name).to_sym)
  end
  compiled = Automaton::CompiledSpec.new(
    machines: machines,
    rules: klass.__flexr_rules,
    states: payload.fetch(:compiled).fetch(:states).map(&:to_sym),
    stats: payload.fetch(:compiled).fetch(:stats),
    diagnostics: payload.fetch(:compiled).fetch(:diagnostics, []).map do |diagnostic|
      Diagnostic.new(**diagnostic.transform_keys(&:to_sym))
    end
  )
  klass.__flexr_set_compiled!(compiled)
  klass.__flexr_mark_generated!
  klass
end

.validate_artifact!(artifact) ⇒ Object 



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# File 'lib/flexr/generated.rb', line 81

def validate_artifact!(artifact)
  return incompatible_artifact!("artifact metadata is missing") unless artifact.is_a?(Hash)

  expected = {
    schema_version: ARTIFACT_SCHEMA_VERSION,
    runtime_abi_version: RUNTIME_ABI_VERSION,
    unicode_version: Unicode::VERSION
  }
  mismatch = expected.find { |name, value| artifact[name] != value }
  compiler_version = artifact[:compiler_version]
  return if mismatch.nil? && compiler_version.is_a?(String) && !compiler_version.empty?

  detail = if mismatch
    name, value = mismatch
    "#{name}=#{artifact[name].inspect} (expected #{value.inspect})"
  else
    "compiler_version=#{compiler_version.inspect}"
  end
  incompatible_artifact!(detail)
end