Module: Serde::SerializerGenerator

Defined in:
lib/serde/serializer_generator.rb

Class Method Summary collapse

Class Method Details

.call(dir, klass) ⇒ Object

rubocop:disable Metrics/MethodLength, Metrics/AbcSize, Metrics/CyclomaticComplexity



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# File 'lib/serde/serializer_generator.rb', line 10

def call(dir, klass)
  FileUtils.cp_r(Dir.glob(File.expand_path('../../templates/extension/*', __dir__)), '.')

  schema = klass.instance_variable_get(:@schema)

  name = underscore(klass.name)
  fields = schema.map do |k, v|
    v = v.to_s
    type =
      case v
      when 'Integer' then 'i64'
      when 'Float' then 'f64'
      else v
      end
    ctype =
      case v
      when 'Integer' then 'int'
      when 'String' then 'char*'
      end
    cdecl =
      case v
      when 'Integer' then "int c_#{k} = NUM2INT(#{k});"
      when 'String' then "char* c_#{k} = StringValueCStr(#{k});"
      end
    rctype =
      case v
      when 'String' then '*const c_char'
      when 'Integer' then 'i64'
      when 'Float' then 'f64'
      else v
      end
    { name: k, type: type, rctype: rctype, cdecl: cdecl, ctype: ctype }
  end

  rust_extras = []

  schema.each do |k, v|
    next unless v.to_s == 'String'

    rust_extras.push(<<~RUST)
      let #{k} = unsafe {
        CStr::from_ptr(#{k}).to_string_lossy().into_owned()
      };
    RUST
  end

  serializer = {
    class_name: klass.name,
    name: name,
    fields: fields,
    joint_fields: fields.map do |field|
      "#{field[:name]}: #{field[:type]}"
    end.join(', '),
    joint_fields_rctype: fields.map do |field|
      "#{field[:name]}: #{field[:rctype]}"
    end.join(', '),
    joint_fields_c: fields.map do |field|
      "#{field[:ctype]} #{field[:name]}"
    end.join(', '),
    rust_extras: rust_extras,
  }

  mod_template = ERB.new(File.read(File.expand_path('../../templates/rust/mod.rs', __dir__)))
  compiled_template = mod_template.result(binding)

  File.write(File.expand_path("../../rust/src/#{name}.rs", __dir__), compiled_template)

  c_template = ERB.new(File.read(File.expand_path('../../templates/c/serde_rb.c', __dir__)))
  compiled_template = c_template.result(binding)

  File.write('./serde_rb/serde_rb.c', compiled_template)

  lib_template = ERB.new(File.read(File.expand_path('../../templates/rust/lib.rs', __dir__)))
  compiled_template = lib_template.result(binding)

  File.write(File.expand_path('../../rust/src/lib.rs', __dir__), compiled_template)
end