Module: MilkTea::SexprParser

Defined in:
lib/milk_tea/tooling/sexpr_parser.rb

Defined Under Namespace

Classes: Token

Class Method Summary collapse

Class Method Details

._construct_ast_object(type_name, fields) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 215

def _construct_ast_object(type_name, fields)
  name = type_name.split("::").last
  klass = MilkTea::AST.const_get(name)
  sym_fields = fields.transform_keys(&:to_sym)
  klass.new(**sym_fields)
rescue NameError
  _construct_generic(type_name, fields)
end

._construct_generic(type_name, fields) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 392

def _construct_generic(type_name, fields)
  klass = begin
    name_parts = type_name.split("::")
    if name_parts.length > 1
      top = Object.const_get(name_parts.first)
      rest = name_parts[1..].join("::")
      top.const_get(rest)
    else
      Object.const_get(type_name)
    end
  rescue NameError
    nil
  end

  if klass && klass.respond_to?(:members)
    sym_fields = fields.transform_keys(&:to_sym)
    klass.new(**sym_fields)
  else
    fields
  end
end

._construct_ir_object(type_name, fields) ⇒ Object

── object constructors ───────────────────────────────────────────



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 206

def _construct_ir_object(type_name, fields)
  name = type_name.split("::").last
  klass = MilkTea::IR.const_get(name)
  sym_fields = fields.transform_keys(&:to_sym)
  klass.new(**sym_fields)
rescue NameError
  _construct_generic(type_name, fields)
end

._construct_standalone_type(short, fields) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 302

def _construct_standalone_type(short, fields)
  case short
  when "TypeType"
    Types::TypeType.new
  when "Error"
    Types::Error.new
  when "Subscription"
    Types::Subscription.new
  when "Handle"
    Types::Handle.new
  when "Struct"
    Types::Struct.new(
      fields[:name],
      module_name: fields[:module_name],
      external: false,
      packed: false,
      alignment: nil,
      linkage_name: nil,
      lifetime_params: [],
    )
  when "Variant"
    Types::Variant.new(fields[:name], module_name: fields[:module_name])
  when "Union"
    Types::Union.new(
      fields[:name],
      module_name: fields[:module_name],
      external: false,
      packed: false,
      alignment: nil,
      linkage_name: nil,
      lifetime_params: [],
    )
  when "Opaque"
    Types::Opaque.new(fields[:name], module_name: fields[:module_name], external: false, linkage_name: nil)
  when "Enum"
    Types::Enum.new(fields[:name], module_name: fields[:module_name], external: false)
  when "Flags"
    Types::Flags.new(fields[:name], module_name: fields[:module_name], external: false)
  when "Event"
    Types::Event.new(
      fields[:name],
      capacity: fields[:capacity],
      payload_type: fields[:payload_type],
      module_name: nil,
      visibility: :private,
      owner_type_name: nil,
    )
  when "StringView"
    Types::Registry.string_view
  else
    _construct_types_fallback(short, fields)
  end
end

._construct_types_fallback(short, fields) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 356

def _construct_types_fallback(short, fields)
  klass = begin
    Types.const_get(short)
  rescue NameError
    return fields
  end

  begin
    sym_fields = fields.transform_keys(&:to_sym)
    klass.new(**sym_fields)
  rescue StandardError
    begin
      args = fields.values
      klass.new(*args)
    rescue StandardError
      begin
        obj = klass.allocate
        fields.each do |k, v|
          ivar = "@#{k}"
          obj.instance_variable_set(ivar, v) if obj.instance_variable_defined?(ivar) || obj.respond_to?(:"#{k}=")
        rescue StandardError
          nil
        end
        begin
          obj.instance_variable_set(:@hash, obj.object_id.hash)
        rescue StandardError
          nil
        end
        obj
      rescue StandardError
        fields
      end
    end
  end
end

._construct_types_object(type_name, fields) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 224

def _construct_types_object(type_name, fields)
  short = type_name.sub(/\ATypes::/, "")
  case short
  when "Primitive"
    Types::Registry.primitive(fields[:name])
  when "Null"
    Types::Null.new(fields[:target_type])
  when "Nullable"
    Types::Registry.nullable(fields[:base])
  when "Generic"
    Types::Registry.generic_instance(fields[:name], fields[:arguments])
  when "Span"
    Types::Registry.span(fields[:element_type])
  when "Task"
    rt = fields[:result_type] || Types::Registry.primitive("void")
    Types::Registry.task(rt)
  when "Function"
    Types::Registry.function(
      fields[:name],
      params: fields[:params] || [],
      return_type: fields[:return_type],
      receiver_type: fields[:receiver_type],
      receiver_editable: fields[:receiver_editable] || false,
      variadic: fields[:variadic] || false,
      external: fields[:external] || false,
    )
  when "Proc"
    Types::Registry.proc(params: fields[:params] || [], return_type: fields[:return_type])
  when "Tuple"
    Types::Registry.tuple(
      fields.fetch(:element_types, []),
      field_names: fields[:field_names],
    )
  when "Vector"
    Types::Registry.generic_instance(fields[:name], [Types::LiteralTypeArg.new(fields[:name].delete_prefix("vec").to_i)])
  when "Matrix"
    Types::Registry.generic_instance(fields[:name], [Types::LiteralTypeArg.new(fields[:name].delete_prefix("mat").to_i)])
  when "Quaternion"
    Types::Registry.generic_instance("quat", [])
  when "SoA"
    Types::Registry.soa(fields[:element_type], count: fields[:count])
  when "Simd"
    Types::Registry.simd(fields[:element_type], lane_count: fields[:lane_count])
  when "StringView"
    Types::Registry.string_view
  when "Parameter"
    Types::Registry.parameter(
      fields[:name],
      fields[:type],
      mutable: fields[:mutable] || false,
      passing_mode: fields[:passing_mode]&.to_sym || :plain,
      boundary_type: fields[:boundary_type],
    )
  when "LiteralTypeArg"
    Types::LiteralTypeArg.new(fields[:value])
  when "TypeVar"
    Types::TypeVar.new(fields[:name])
  when "LifetimeRef"
    Types::LifetimeRef.new(fields[:name])
  when "Dyn"
    interface_binding = MilkTea::SemanticAnalyzer::InterfaceBinding.new(
      name: fields[:interface_name],
      methods: [],
      ast: nil,
      module_name: nil,
    )
    Types::Registry.dyn(interface_binding, fields.fetch(:type_arguments, []))
  when "Struct", "StructInstance", "Union", "Variant", "VariantInstance",
       "VariantArmPayload", "Enum", "Flags", "Opaque", "Event", "Subscription", "Handle",
       "TypeType", "Error", "DynVtable", "ReflectionHandleType", "StructHandle",
       "FieldHandle", "CallableHandle", "AttributeHandle", "MemberHandle",
       "GenericStructDefinition", "GenericVariantDefinition"
    _construct_standalone_type(short, fields)
  else
    _construct_standalone_type(short, fields)
  end
end

._parse_list(tokens, index) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 136

def _parse_list(tokens, index)
  index[0] += 1 # skip "("
  if tokens[index[0]]&.kind == ")"
    index[0] += 1 # skip ")"
    return []
  end

  first = _parse_value(tokens, index)

  if first.is_a?(String) && first.match?(/\A[A-Z]/)
    _parse_typed_node(tokens, index, first, first)
  else
    # plain array — first element was the first value
    result = [first]
    while tokens[index[0]]&.kind != ")"
      result << _parse_value(tokens, index)
    end
    index[0] += 1 # skip ")"
    result
  end
end

._parse_typed_node(tokens, index, first_token, first_str) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 158

def _parse_typed_node(tokens, index, first_token, first_str)
  type_name = _resolve_type_name(first_str)

  # Collect keyword-value pairs
  fields = {}
  while tokens[index[0]]&.kind == "keyword"
    kw = tokens[index[0]].text.gsub("-", "_").to_sym
    index[0] += 1 # skip keyword
    val = _parse_value(tokens, index)
    fields[kw] = val
  end

  index[0] += 1 # skip ")"

  if type_name.start_with?("Types::")
    _construct_types_object(type_name, fields)
  elsif type_name.start_with?("IR::")
    _construct_ir_object(type_name, fields)
  elsif type_name.start_with?("AST::")
    _construct_ast_object(type_name, fields)
  else
    _construct_generic(type_name, fields)
  end
end

._parse_value(tokens, index = [0]) ⇒ Object

── parser ────────────────────────────────────────────────────────



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 104

def _parse_value(tokens, index = [0])
  token = tokens[index[0]]
  return nil unless token

  case token.kind
  when "("
    _parse_list(tokens, index)
  when "string"
    index[0] += 1
    token.text
  when "integer"
    index[0] += 1
    Integer(token.text)
  when "float"
    index[0] += 1
    Float(token.text)
  when "keyword"
    index[0] += 1
    token.text.gsub("-", "_").to_sym
  when "atom"
    index[0] += 1
    case token.text
    when "nil"  then nil
    when "true" then true
    when "false" then false
    else token.text
    end
  else
    raise "unexpected token: #{token.inspect}"
  end
end

._resolve_type_name(str) ⇒ Object

── type name resolution ──────────────────────────────────────────



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 185

def _resolve_type_name(str)
  # Already fully qualified ("Types::Primitive", "IR::Program")
  return str if str.include?("::")

  # Try common prefixes
  [
    "MilkTea::IR::#{str}",
    "MilkTea::AST::#{str}",
    "MilkTea::Types::#{str}",
  ].each do |candidate|
    begin
      return candidate if Object.const_get(candidate)
    rescue NameError
      nil
    end
  end
  str
end

._unescape(str) ⇒ Object

── helpers ───────────────────────────────────────────────────────



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 416

def _unescape(str)
  str.gsub("\\n", "\n").gsub("\\t", "\t").gsub("\\r", "\r").gsub('\\"', '"').gsub("\\\\", "\\")
end

.parse_ast(sexpr) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 14

def parse_ast(sexpr)
  tokens = tokenize(sexpr)
  _parse_value(tokens)
end

.parse_ir(sexpr) ⇒ Object

── public API ────────────────────────────────────────────────────



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 9

def parse_ir(sexpr)
  tokens = tokenize(sexpr)
  _parse_value(tokens)
end

.parse_tokens(sexpr) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 19

def parse_tokens(sexpr)
  tokens = tokenize(sexpr)
  _parse_value(tokens)
end

.tokenize(source) ⇒ Object 



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# File 'lib/milk_tea/tooling/sexpr_parser.rb', line 28

def tokenize(source)
  tokens = []
  i = 0
  len = source.length
  line = 1
  col = 1
  while i < len
    ch = source[i]
    case ch
    when "(", ")"
      tokens << Token.new(kind: ch, text: ch, line:, column: col)
      i += 1
      col += 1
    when '"'
      j = i + 1
      chars = +""
      while j < len
        if source[j] == "\\" && j + 1 < len
          case source[j + 1]
          when "n"  then chars << "\n"
          when "t"  then chars << "\t"
          when "r"  then chars << "\r"
          when '"'  then chars << '"'
          when "\\" then chars << "\\"
          else chars << source[j + 1]
          end
          j += 2
        elsif source[j] == '"'
          j += 1
          break
        else
          chars << source[j]
          j += 1
        end
      end
      tokens << Token.new(kind: "string", text: chars, line:, column: col)
      col += j - i
      i = j
    when ":", "-", "0".."9"
      # keyword, negative number, or number
      j = i
      j += 1 while j < len && source[j] != " " && source[j] != "\n" && source[j] != "(" && source[j] != ")" && source[j] != '"'
      text = source[i...j]
      if text.start_with?(":")
        tokens << Token.new(kind: "keyword", text: text[1..], line:, column: col)
      elsif text.match?(/\A-?[0-9]+\.[0-9]+([eE][+-]?[0-9]+)?\z/) || text.match?(/\A-?[0-9]+\.[0-9]*([eE][+-]?[0-9]+)?\z/)
        tokens << Token.new(kind: "float", text:, line:, column: col)
      elsif text.match?(/\A-?[0-9]+\z/)
        tokens << Token.new(kind: "integer", text:, line:, column: col)
      else
        tokens << Token.new(kind: "atom", text:, line:, column: col)
      end
      col += j - i
      i = j
    when /\s/
      if ch == "\n"
        line += 1
        col = 0
      end
      i += 1
      col += 1
    else
      # atom (identifier, true, false, nil)
      j = i
      j += 1 while j < len && source[j] != " " && source[j] != "\n" && source[j] != "(" && source[j] != ")" && source[j] != '"'
      text = source[i...j]
      tokens << Token.new(kind: "atom", text:, line:, column: col)
      col += j - i
      i = j
    end
  end
  tokens
end