Module: Parslet::Toml::Merge

Defined in:
lib/parslet/toml/merge/provider.rb,
lib/parslet/toml/merge.rb,
lib/parslet/toml/merge/version.rb,
sig/parslet/toml/merge.rbs

Overview

Parslet-backed TOML structural merge provider integration.

Defined Under Namespace

Modules: Version Classes: Provider, SmartMerger

Constant Summary collapse

PACKAGE_NAME = 
'parslet-toml-merge'
BACKEND = 
TreeHaver::PARSLET_BACKEND
BACKEND_REGISTRY = 
Struct.new(:registered, :mutex).new(false, Mutex.new)
VERSION =

Current gem version exposed at the traditional constant location.

Returns:

  • (String) 
Version::VERSION

Class Method Summary collapse

Class Method Details

.available_toml_backends ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 35

def available_toml_backends
  [BACKEND]
end

.match_toml_owners(template, destination) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 71

def match_toml_owners(template, destination)
  ::Toml::Merge.match_toml_owners(template, destination)
end

.merge_provider ⇒ Provider

Returns:



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# File 'lib/parslet/toml/merge/provider.rb', line 18

def merge_provider
  @merge_provider ||= Provider.new
end

.merge_toml(template_source, destination_source, dialect, backend: nil) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 75

def merge_toml(template_source, destination_source, dialect, backend: nil)
  requested = backend.to_s.empty? ? BACKEND.id : backend.to_s
  return unsupported_feature_result("Unsupported TOML backend #{requested}.") unless requested == BACKEND.id

  return unsupported_feature_result("Unsupported TOML dialect #{dialect}.") unless dialect == 'toml'

  template_parse = parse_toml(template_source, dialect, backend: BACKEND.id)
  return provider_parse_failure(:template_parse_error, template_parse) unless template_parse[:ok]

  destination_parse = parse_toml(destination_source, dialect, backend: BACKEND.id)
  return provider_parse_failure(:destination_parse_error, destination_parse) unless destination_parse[:ok]

  output = SmartMerger.new(
    template_source,
    destination_source,
    preference: :destination,
    add_template_only_nodes: true
  ).merge_result.to_toml

  {
    ok: true,
    diagnostics: [],
    output: output,
    policies: [::Toml::Merge::DESTINATION_WINS_ARRAY_POLICY]
  }
rescue ::Toml::Merge::TemplateParseError => e
  { ok: false, diagnostics: [{ severity: 'error', category: 'template_parse_error', message: e.message }],
    policies: [] }
rescue ::Toml::Merge::DestinationParseError => e
  { ok: false, diagnostics: [{ severity: 'error', category: 'destination_parse_error', message: e.message }],
    policies: [] }
rescue StandardError => e
  { ok: false, diagnostics: [{ severity: 'error', category: 'merge_error', message: e.message }], policies: [] }
end

.parse_toml(source, dialect, backend: nil) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 63

def parse_toml(source, dialect, backend: nil)
  requested = backend.to_s.empty? ? BACKEND.id : backend.to_s
  return unsupported_feature_result("Unsupported TOML backend #{requested}.") unless requested == BACKEND.id
  return unsupported_feature_result("Unsupported TOML dialect #{dialect}.") unless dialect == 'toml'

  TreeHaver.with_backend(BACKEND.id) { ::Toml::Merge.analyze_toml_source(source, dialect) }
end

.provider_parse_failure(category, parse_result) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 118

def provider_parse_failure(category, parse_result)
  diagnostics = Array(parse_result[:diagnostics])
  message = diagnostics.map { |diagnostic| diagnostic[:message] || diagnostic['message'] }.compact.join('; ')
  message = 'provider parse failed' if message.empty?
  { ok: false, diagnostics: [{ severity: 'error', category: category.to_s, message: message }], policies: [] }
end

.register_backend! ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 17

def register_backend!
  BACKEND_REGISTRY.mutex.synchronize do
    return if BACKEND_REGISTRY.registered

    TreeHaver.register_language(
      :toml,
      grammar_class: TOML::Parslet,
      gem_name: 'toml'
    )

    BACKEND_REGISTRY.registered = true
  end
end

.register_provider!(replace: false) ⇒ Object

Parameters:

  • replace: (Boolean) (defaults to: false)

Returns:

  • (Object) 


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# File 'lib/parslet/toml/merge/provider.rb', line 22

def register_provider!(replace: false)
  Ast::Merge.register_provider(merge_provider, replace: replace)
end

.toml_backend_feature_profile(backend: nil) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 39

def toml_backend_feature_profile(backend: nil)
  requested = backend.to_s.empty? ? BACKEND.id : backend.to_s
  return unsupported_feature_result("Unsupported TOML backend #{requested}.") unless requested == BACKEND.id

  toml_feature_profile.merge(
    backend: BACKEND.id,
    backend_ref: BACKEND.to_h
  )
end

.toml_feature_profile ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 31

def toml_feature_profile
  ::Toml::Merge.toml_feature_profile
end

.toml_plan_context(backend: nil) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 49

def toml_plan_context(backend: nil)
  profile = toml_backend_feature_profile(backend: backend)
  return profile if profile[:ok] == false

  {
    family_profile: toml_feature_profile,
    feature_profile: {
      backend: profile[:backend],
      supports_dialects: false,
      supported_policies: profile[:supported_policies]
    }
  }
end

.unsupported_feature_result(message) ⇒ Object 



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# File 'lib/parslet/toml/merge.rb', line 110

def unsupported_feature_result(message)
  {
    ok: false,
    diagnostics: [{ severity: 'error', category: 'unsupported_feature', message: message }],
    policies: []
  }
end