Class: Luoma::UnifiedParser

Inherits:
Parser
  • Object
show all
Defined in:
lib/luoma/parser_unified.rb,
sig/luoma/parser_unified.rbs

Defined Under Namespace

Classes: Precedence

Constant Summary collapse

PRECEDENCES =

Returns:

  • (Hash[t_token_kind, Integer]) 
{
  token_or_else: Precedence::COALESCE,
  token_or: Precedence::LOGICAL_OR,
  token_and: Precedence::LOGICAL_AND,
  token_not: Precedence::LOGICAL_NOT,
  token_eq: Precedence::COMPARISON,
  token_ne: Precedence::COMPARISON,
  token_lt: Precedence::COMPARISON,
  token_le: Precedence::COMPARISON,
  token_gt: Precedence::COMPARISON,
  token_ge: Precedence::COMPARISON,
  token_in: Precedence::MEMBERSHIP,
  token_contains: Precedence::MEMBERSHIP,
  token_add: Precedence::ADD,
  token_sub: Precedence::ADD,
  token_mul: Precedence::MUL,
  token_div: Precedence::MUL,
  token_mod: Precedence::MUL,
  token_pipe: Precedence::PIPE
}.freeze
INFIX_OPERATORS =

Signature:

  • Hash[t_token_kind, Integer]

Returns:

  • (Hash[t_token_kind, untyped]) 
{
  token_or_else: CoalesceExpression,
  token_or: OrExpression,
  token_and: AndExpression,
  token_eq: EqExpression,
  token_ne: NeExpression,
  token_lt: LtExpression,
  token_le: LeExpression,
  token_gt: GtExpression,
  token_ge: GeExpression,
  token_in: InExpression,
  token_contains: ContainsExpression,
  token_add: AddExpression,
  token_sub: SubExpression,
  token_mul: MulExpression,
  token_div: DivExpression,
  token_mod: ModExpression,
  token_pipe: nil
}.freeze
TERMINATE_EXPRESSION =

Signature:

  • Hash[t_token_kind, untyped]

Returns:

  • (Set[t_token_kind]) 
Set[
  :token_wc,
  :token_out_end,
  :token_tag_end,
  :token_text,
  :token_if,
  :token_else,
  :token_rparen,
  :token_eoi,
  :token_interpolation_end,
  :token_comma
].freeze
TERMINATE_FILTER =

Signature:

  • Set[t_token_kind]

Returns:

  • (Set[t_token_kind]) 
Set[
    :token_wc,
    :token_out_end,
    :token_tag_end,
    :token_text,
    :token_if,
    :token_else,
    :token_rparen,
    :token_rbracket,
    :token_rbrace,
    :token_pipe,
    :token_eoi,
    :token_interpolation_end,
    :token_or_else,
    :token_or,
    :token_and,
    :token_eq,
    :token_ne,
    :token_lt,
    :token_le,
    :token_gt,
    :token_ge,
    :token_in,
    :token_contains
].freeze
PATH_PUNCTUATION =

Signature:

  • Set[t_token_kind]

Returns:

  • (Set[t_token_kind]) 
Set[
    :token_dot,
    :token_lbracket
].freeze
STRING_LITERAL_KINDS =

Signature:

  • Set[t_token_kind]

Returns:

  • (Set[t_token_kind]) 
Set[
  :token_single_escaped,
  :token_single_quoted,
  :token_double_escaped,
  :token_double_quoted
].freeze
PATH_SEGMENT_KINDS =

Signature:

  • Set[t_token_kind]

Returns:

  • (Set[t_token_kind]) 
Set[
  :token_ident,
  :token_false,
  :token_true,
  :token_null,
  :token_nil,
  :token_and,
  :token_or,
  :token_orElse,
  :token_not,
  :token_in,
  :token_contains
].freeze
KEYWORD_ARGUMENT_DELIMITERS =

Signature:

  • Set[t_token_kind]

Returns:

  • (Set[t_token_kind]) 
Set[
  :token_colon,
  :token_assign
].freeze
RE_SLASH_U =

Signature:

  • Set[t_token_kind]

Returns:

  • (::Regexp) 
/\\u([0-9a-fA-F]{4})/
RE_ESCAPE_INTERPOLATION =

Returns:

  • (::Regexp) 
/\\\$\{/

Instance Attribute Summary

Attributes inherited from Parser

#env, #source, #template_name

Instance Method Summary collapse

Methods inherited from Parser

#carry_whitespace_control, #current, #current_value, #eat, #eat_empty_tag, #eat_one_of, #eat_tag, #expect_expression, #initialize, #kind, #next, parse, #peek, #peek_tag_name, #peek_whitespace_control, #skip_whitespace_control, #tag?, #tags

Constructor Details

This class inherits a constructor from Luoma::Parser

Instance Method Details

#high_surrogate?(code_point) ⇒ Boolean

Signature:

  • (Integer) -> bool

Parameters:

  • code_point (Integer)

Returns:

  • (Boolean) 


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# File 'lib/luoma/parser_unified.rb', line 970

def high_surrogate?(code_point)
  code_point.between?(0xD800, 0xDBFF)
end

#low_surrogate?(code_point) ⇒ Boolean

Signature:

  • (Integer) -> bool

Parameters:

  • code_point (Integer)

Returns:

  • (Boolean) 


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# File 'lib/luoma/parser_unified.rb', line 975

def low_surrogate?(code_point)
  code_point.between?(0xDC00, 0xDFFF)
end

#parse_arguments(require_commas: nil) ⇒ Array[Expression | KeywordArgument]

(?require_commas: bool?) -> Array[Expression | KeywordArgument]

Parameters:

  • require_commas: (Boolean, nil) (defaults to: nil)

Returns:



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# File 'lib/luoma/parser_unified.rb', line 135

def parse_arguments(require_commas: nil)
  args = [] #: Array[Expression | KeywordArgument]

  loop do
    kind_ = kind
    break if TERMINATE_EXPRESSION.include?(kind_)

    if kind_ == :token_ident && KEYWORD_ARGUMENT_DELIMITERS.include?(peek.first)
      # A named argument
      name = parse_ident
      eat_one_of(KEYWORD_ARGUMENT_DELIMITERS)
      args << KeywordArgument.new(name.token, name, parse_expression)
    else
      args << parse_expression
    end

    kind_ = kind
    if require_commas && !TERMINATE_EXPRESSION.include?(kind_)
      eat(:token_comma)
    elsif kind_ == :token_comma
      @pos += 1
    end
  end

  args
end

#parse_array_or_path ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 564

def parse_array_or_path
  start_pos = @pos
  token = eat(:token_lbracket)

  case kind
  when :token_rbracket
    # Empty array.
    ArrayLiteral.new(token, []).with(eat(:token_rbracket))
  when :token_triple_dot
    # An array with a spread operator before the first item.
    parse_partial_array(token, Spread.new(self.next, parse_expression))
  else
    expr = parse_expression

    if kind != :token_comma && expr.is_a?(StringLiteral)
      # A path, backtrack.
      @pos = start_pos
      parse_path
    else
      parse_partial_array(token, expr)
    end
  end
end

#parse_block(stop: nil) ⇒ t_block

(?stop: Set?) -> t_block

Parameters:

  • stop: (Set[String], nil) (defaults to: nil)

Returns:

  • (t_block) 


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# File 'lib/luoma/parser_unified.rb', line 163

def parse_block(stop: nil)
  nodes = [] #: t_block

  loop do
    token = self.next

    case token.first
    when :token_text
      nodes << @env.trim(
        Luoma.get_token_value(token, @source),
        @whitespace_control_carry,
        peek_whitespace_control
      )
    when :token_out_start
      nodes << parse_output
    when :token_tag_start
      if stop&.include?(peek_tag_name)
        @pos -= 1
        break
      end

      nodes << parse_tag
    when :token_comment_start
      nodes << parse_comment
    when :token_eoi
      break
    else
      raise TemplateSyntaxError.new(
        "unexpected #{Luoma::TOKEN_KIND_MAP[token.first].inspect}",
        token,
        @source,
        @template_name
      )
    end
  end

  nodes
end

#parse_bracketed_segment ⇒ t_path_segment

() -> t_path_segment

Returns:

  • (t_path_segment) 


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# File 'lib/luoma/parser_unified.rb', line 529

def parse_bracketed_segment
  eat(:token_lbracket)
  token = self.next

  case token.first
  when :token_int
    IndexSelector.new(
      token, Luoma.get_token_value(token, @source).to_i
    ).with(eat(:token_rbracket))
  when :token_ident, :token_false, :token_true, :token_null, :token_nil, :token_not, :token_and, :token_or
    @pos -= 1
    path = parse_path
    eat(:token_rbracket)
    path
  when :token_double_quote, :token_single_quote
    @pos -= 1
    parse_string_literal.with(eat(:token_rbracket))
  when :token_rbracket
    raise TemplateSyntaxError.new(
      "empty bracketed segment",
      token,
      @source,
      @template_name
    )
  else
    raise TemplateSyntaxError.new(
      "expected an integer, identifier or string",
      token,
      @source,
      @template_name
    )
  end
end

#parse_comment ⇒ Markup

() -> Markup

Returns:



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# File 'lib/luoma/parser_unified.rb', line 440

def parse_comment
  skip_whitespace_control
  token = eat(:token_comment)
  carry_whitespace_control
  eat(:token_comment_end)
  Comment.new(token, Luoma.get_token_value(token, @source))
end

#parse_expression(precedence: Precedence::LOWEST) ⇒ Object

Signature:

  • (?precedence: Integer) -> Expression



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# File 'lib/luoma/parser_unified.rb', line 203

def parse_expression(precedence: Precedence::LOWEST)
  expr = parse_primary(precedence: precedence)
  expr = parse_ternary(expr) if kind == :token_if
  expr
end

#parse_false_literal ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 749

def parse_false_literal
  token = self.next
  if PATH_PUNCTUATION.include?(kind)
    @pos -= 1
    parse_path
  else
    BooleanLiteral.new(token, false)
  end
end

#parse_filter(token, left) ⇒ FilteredExpression

(t_token, Expression) -> FilteredExpression

Parameters:

Returns:



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# File 'lib/luoma/parser_unified.rb', line 783

def parse_filter(token, left)
  name = parse_path

  if TERMINATE_FILTER.include?(kind) || kind == :token_comma
    # No arguments
    return FilteredExpression.new(
      token,
      left,
      Filter.new(
        name.token,
        name,
        [],
        []
      )
    )
  end

  eat(:token_colon, message: "missing colon or pipe")
  args = [] #: Array[Expression]
  kwargs = [] #: Array[KeywordArgument]

  loop do
    kind_ = kind
    break if TERMINATE_FILTER.include?(kind_)

    if kind_ == :token_ident
      peek_kind = peek.first
      if KEYWORD_ARGUMENT_DELIMITERS.include?(peek_kind)
        # A keyword argument
        param = parse_ident
        eat_one_of(KEYWORD_ARGUMENT_DELIMITERS)
        value = parse_expression(precedence: Precedence::FILTER_ARG)
        kwargs << KeywordArgument.new(param.token, param, value)
      elsif peek_kind == :token_arrow
        # A positional argument that is an arrow function with a single
        # parameter.
        args << parse_lambda(precedence: Precedence::FILTER_ARG)
      else
        # A positional argument that is a variable or path
        args << parse_expression(precedence: Precedence::FILTER_ARG)
      end
    else
      break if TERMINATE_FILTER.include?(kind_)

      args << parse_expression(precedence: Precedence::FILTER_ARG)
    end

    break if TERMINATE_FILTER.include?(kind)

    eat(:token_comma, message: "missing comma or pipe")
  end

  FilteredExpression.new(
    token,
    left,
    Filter.new(
      name.token,
      name,
      args,
      kwargs
    )
  )
end

#parse_float_literal ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 777

def parse_float_literal
  token = self.next
  FloatLiteral.new(token, Float(Luoma.get_token_value(token, @source)))
end

#parse_ident ⇒ Name

() -> Name

Returns:



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# File 'lib/luoma/parser_unified.rb', line 210

def parse_ident
  token = eat(:token_ident)

  if PATH_PUNCTUATION.include?(kind)
    raise TemplateSyntaxError.new(
      "expected an identifier, found a path",
      token,
      @source,
      @template_name
    )
  end

  Name.new(token, Luoma.get_token_value(token, @source))
end

#parse_infix(left) ⇒ Expression

(Expression) -> Expression

Parameters:

Returns:



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# File 'lib/luoma/parser_unified.rb', line 856

def parse_infix(left)
  op_token = self.next
  kind_ = op_token.first

  return parse_filter(op_token, left) if kind_ == :token_pipe

  right = parse_expression(precedence: PRECEDENCES[kind_] || Precedence::LOWEST)
  INFIX_OPERATORS[kind_].new(op_token, left, right)
end

#parse_int_literal ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 771

def parse_int_literal
  token = self.next
  IntegerLiteral.new(token, Luoma.get_token_value(token, @source).to_i)
end

#parse_keyword_arguments(require_commas: nil) ⇒ Array[KeywordArgument]

(?require_commas: bool?) -> Array

Parameters:

  • require_commas: (Boolean, nil) (defaults to: nil)

Returns:



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# File 'lib/luoma/parser_unified.rb', line 226

def parse_keyword_arguments(require_commas: nil)
  args = [] #: Array[KeywordArgument]

  loop do
    kind_ = kind
    break if TERMINATE_EXPRESSION.include?(kind_)

    name = parse_ident
    eat_one_of(KEYWORD_ARGUMENT_DELIMITERS)
    args << KeywordArgument.new(name.token, name, parse_expression)

    kind_ = kind
    if require_commas && !TERMINATE_EXPRESSION.include?(kind_)
      eat(:token_comma)
    elsif kind_ == :token_comma
      @pos += 1
    end
  end

  args
end

#parse_lambda(precedence:) ⇒ Lambda

(precedence: Integer) -> Lambda

Parameters:

  • precedence: (Integer)

Returns:



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# File 'lib/luoma/parser_unified.rb', line 849

def parse_lambda(precedence:)
  param = parse_ident
  eat(:token_arrow)
  Lambda.new(param.token, [param], parse_expression(precedence: precedence))
end

#parse_lambda_range_or_group(precedence:) ⇒ Expression

(precedence: Integer) -> Expression

Parameters:

  • precedence: (Integer)

Returns:



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# File 'lib/luoma/parser_unified.rb', line 645

def parse_lambda_range_or_group(precedence:)
  token = eat(:token_lparen)
  expr = parse_expression

  case kind
  when :token_double_dot
    # A range literal
    @pos += 1
    stop = parse_expression
    eat(:token_rparen, message: "expected a closing bracket")
    RangeLiteral.new(token, expr, stop)
  when :token_triple_dot
    raise TemplateSyntaxError.new(
      "too many dots",
      current,
      @source,
      @template_name
    )
  when :token_comma
    # A lambda expression, but we've already consumed the first parameter.
    parse_partial_lambda(expr, precedence: precedence)
  else
    if peek.first == :token_arrow && kind == :token_rparen
      # A lambda expression with a single parameter surrounded by parens.
      parse_partial_lambda(expr, precedence: precedence)
    else
      closing_token = eat(:token_rparen, message: "unbalanced brackets")
      segments = PATH_PUNCTUATION.include?(kind) ? parse_path_segments : [] #: Array[t_path_segment]
      GroupExpression.new(token, expr, segments).with(closing_token)
    end
  end
end

#parse_name ⇒ Name

Parse an identifier, possibly surrounded by quotes. () -> Name

Returns:



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# File 'lib/luoma/parser_unified.rb', line 250

def parse_name
  case kind
  when :token_ident
    parse_ident
  when :token_single_quote, :token_double_quote
    expr = parse_string_literal

    if expr.segments.length > 1 || !expr.segments.first.is_a?(String)
      raise TemplateSyntaxError.new(
        "expected a string or identifier",
        current,
        @source,
        @template_name
      )
    end

    Name.new(expr.token, expr.segments[0]) # steep:ignore
  else
    raise TemplateSyntaxError.new(
      "expected a string or identifier",
      current,
      @source,
      @template_name
    )
  end
end

#parse_null_literal ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 760

def parse_null_literal
  token = self.next
  if PATH_PUNCTUATION.include?(kind)
    @pos -= 1
    parse_path
  else
    NullLiteral.new(token)
  end
end

#parse_object_item ⇒ Item, Spread

() -> Item | Spread

Returns:



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# File 'lib/luoma/parser_unified.rb', line 635

def parse_object_item
  return Spread.new(self.next, parse_expression) if kind == :token_triple_dot

  key = parse_name
  eat(:token_colon)
  value = parse_expression
  Item.new(key.token, key, value)
end

#parse_object_literal ⇒ ObjectLiteral

() -> ObjectLiteral

Returns:



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# File 'lib/luoma/parser_unified.rb', line 614

def parse_object_literal
  token = eat(:token_lbrace)

  return ObjectLiteral.new(token, []).with(eat(:token_rbrace)) if kind == :token_rbrace

  items = [parse_object_item] #: Array[Item|Spread]

  loop do
    break if kind == :token_rbrace

    eat(:token_comma)
    break if kind == :token_rbrace # Trailing commas are OK.

    items << parse_object_item
  end

  eat(:token_rbrace)
  ObjectLiteral.new(token, items)
end

#parse_output ⇒ Markup

() -> Markup

Returns:



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# File 'lib/luoma/parser_unified.rb', line 420

def parse_output
  token = @tokens[@pos - 1]
  skip_whitespace_control
  expr = parse_expression
  carry_whitespace_control

  unless kind == :token_out_end
    raise TemplateSyntaxError.new(
      "bad expression or missing markup delimiter",
      expr.span,
      @source,
      @template_name
    )
  end

  eat(:token_out_end)
  OutputStatement.new(token, expr)
end

#parse_partial_array(token, first) ⇒ Expression

(t_token, Expression|Spread) -> Expression

Parameters:

Returns:



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# File 'lib/luoma/parser_unified.rb', line 590

def parse_partial_array(token, first)
  items = [first] #: Array[Expression|Spread]

  loop do
    break if kind == :token_rbracket

    eat(:token_comma)

    case kind
    when :token_rbracket
      # Trailing commas are OK.
      break
    when :token_triple_dot
      items << Spread.new(self.next, parse_expression)
    else
      items << parse_expression
    end
  end

  eat(:token_rbracket)
  ArrayLiteral.new(token, items)
end

#parse_partial_lambda(expr, precedence:) ⇒ Expression

(Expression, precedence: Integer) -> Lambda

Parameters:

Returns:



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# File 'lib/luoma/parser_unified.rb', line 681

def parse_partial_lambda(expr, precedence:)
  unless expr.is_a?(Variable) && expr.segments.empty? && expr.root.is_a?(Name)
    raise TemplateSyntaxError.new(
      "expected an identifier",
      expr.token,
      @source,
      @template_name
    )
  end

  params = [expr.root] #: Array[Name]
  @pos += 1 if kind == :token_comma

  loop do
    break if kind == :token_rparen

    params << parse_ident
    @pos += 1 if kind == :token_comma
  end

  eat(:token_rparen)
  eat(:token_arrow)
  Lambda.new(expr.token, params, parse_expression(precedence: precedence))
end

#parse_path ⇒ Variable

() -> Variable

Returns:



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# File 'lib/luoma/parser_unified.rb', line 468

def parse_path
  token = current

  root = if PATH_SEGMENT_KINDS.include?(token.first)
           @pos += 1
           Name.new(token, Luoma.get_token_value(token, @source))
         else
           eat(:token_lbracket)
           if kind == :token_ident
             path = parse_path
             eat(:token_rbracket)
             path
           else
             parse_string_literal.with(eat(:token_rbracket))
           end
         end

  Variable.new(token, root, parse_path_segments)
end

#parse_path_segments ⇒ Array[t_path_segment]

() -> Array

Returns:

  • (Array[t_path_segment]) 


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# File 'lib/luoma/parser_unified.rb', line 489

def parse_path_segments
  segments = [] #: Array[t_path_segment]

  loop do
    case kind
    when :token_lbracket
      segments << parse_bracketed_segment
    when :token_dot
      @pos += 1
      token = eat_one_of(PATH_SEGMENT_KINDS)

      if kind == :token_question
        @pos += 1
        segments << Predicate.new(
          token,
          Luoma.get_token_value(token, @source)
        )

        if PATH_PUNCTUATION.include?(kind)
          raise TemplateSyntaxError.new(
            "unexpected segment after predicate",
            current,
            @source,
            @template_name
          )
        end

        break
      end

      segments << Name.new(token, Luoma.get_token_value(token, @source))
    else
      break
    end
  end

  segments
end

#parse_positional_arguments(require_commas: nil) ⇒ Array[Expression]

(?require_commas: bool?) -> Array

Parameters:

  • require_commas: (Object, nil) (defaults to: nil)

Returns:



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# File 'lib/luoma/parser_unified.rb', line 278

def parse_positional_arguments(require_commas: nil)
  args = [] #: Array[Expression]

  loop do
    break if TERMINATE_EXPRESSION.include?(kind)

    args << parse_expression

    kind_ = kind
    if require_commas && !TERMINATE_EXPRESSION.include?(kind_)
      eat(:token_comma)
    elsif kind_ == :token_comma
      @pos += 1
    end
  end

  args
end

#parse_prefix ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 707

def parse_prefix
  token = self.next

  case token.first
  when :token_not
    NotExpression.new(token, parse_expression(precedence: Precedence::LOGICAL_NOT))
  when :token_add
    PosExpression.new(token, parse_expression(precedence: Precedence::NEG))
  when :token_sub
    NegExpression.new(token, parse_expression(precedence: Precedence::NEG))
  else
    raise TemplateSyntaxError.new(
      "unknown prefix operator",
      token,
      @source,
      @template_name
    )
  end
end

#parse_primary(precedence: Precedence::LOWEST) ⇒ Expression

(?precedence: Integer) -> Expression

Parameters:

  • precedence: (Integer) (defaults to: Precedence::LOWEST)

Returns:



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# File 'lib/luoma/parser_unified.rb', line 342

def parse_primary(precedence: Precedence::LOWEST)
  left = case kind
         when :token_single_quote, :token_double_quote
           parse_string_literal
         when :token_ident
           peek.first == :token_arrow ? parse_lambda(precedence: precedence) : parse_path
         when :token_lbracket
           parse_array_or_path
         when :token_lbrace
           parse_object_literal
         when :token_lparen
           parse_lambda_range_or_group(precedence: precedence)
         when :token_not
           PATH_PUNCTUATION.include?(peek.first) ? parse_path : parse_prefix
         when :token_add, :token_sub
           parse_prefix
         when :token_true
           PATH_PUNCTUATION.include?(peek.first) ? parse_path : parse_true_literal
         when :token_false
           PATH_PUNCTUATION.include?(peek.first) ? parse_path : parse_false_literal
         when :token_null, :token_nil
           PATH_PUNCTUATION.include?(peek.first) ? parse_path : parse_null_literal
         when :token_int
           parse_int_literal
         when :token_float
           parse_float_literal
         when :token_and, :token_or, :token_orElse, :token_contains, :token_in, :token_if, :token_else
           if PATH_PUNCTUATION.include?(peek.first) || TERMINATE_EXPRESSION.include?(peek.first)
             parse_path
           else
             token = current
             raise TemplateSyntaxError.new(
               "unexpected operator #{Luoma.get_token_value(token, @source).inspect}",
               token,
               @source,
               @template_name
             )
           end
         when :token_out_end, :token_wc, :token_tag_end
           raise TemplateSyntaxError.new(
             "unexpected empty expression",
             current,
             @source,
             @template_name
           )
         else
           token = current
           raise TemplateSyntaxError.new(
             "expected an expression, found #{Luoma::TOKEN_KIND_MAP[token.first].inspect}",
             token,
             @source,
             @template_name
           )
         end

  loop do
    kind_ = kind
    break if (PRECEDENCES[kind_] || Precedence::LOWEST) < precedence || !INFIX_OPERATORS.include?(kind_)

    left = parse_infix(left)
  end

  left
end

#parse_range_literal ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 728

def parse_range_literal
  token = eat(:token_lparen)
  start = parse_expression
  eat(:token_double_dot)
  stop = parse_expression
  eat(:token_rparen)
  RangeLiteral.new(token, start, stop)
end

#parse_string_literal ⇒ StringLiteral

() -> StringLiteral

Returns:



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# File 'lib/luoma/parser_unified.rb', line 298

def parse_string_literal
  token = self.next # quote
  segments = [] #: Array[String|Expression]

  loop do
    case kind
    when :token_single_quoted, :token_double_quoted
      segments << Luoma.get_token_value(self.next, @source)
    when :token_single_escaped, :token_double_escaped
      segments << unescape(self.next)
    when :token_interpolation_start
      start_token = self.next
      segments << parse_expression

      unless kind == :token_interpolation_end
        raise TemplateSyntaxError.new(
          "unclosed template string expression",
          Luoma.span(start_token, current),
          @source,
          @template_name
        )
      end

      eat(:token_interpolation_end)
    else
      break
    end
  end

  unless kind == token.first
    raise TemplateSyntaxError.new(
      "unclosed string literal",
      Luoma.span(token, @tokens[@pos - 1] || current),
      @source,
      @template_name
    )
  end

  StringLiteral.new(token, segments, eat(token.first))
end

#parse_tag ⇒ Markup

() -> Markup

Returns:



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# File 'lib/luoma/parser_unified.rb', line 449

def parse_tag
  skip_whitespace_control
  token = eat(:token_tag_name, message: "missing tag name")
  tag_name = Luoma.get_token_value(token, @source)
  tag = @env.tags[tag_name]

  unless tag
    raise TemplateSyntaxError.new(
      "unexpected tag #{Luoma.get_token_value(token, @source).inspect}",
      token,
      @source,
      @template_name
    )
  end

  tag.parse(token, tag_name, self)
end

#parse_ternary(consequence) ⇒ Expression

(Expression) -> Expression

Parameters:

Returns:



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# File 'lib/luoma/parser_unified.rb', line 408

def parse_ternary(consequence)
  eat(:token_if)
  condition = parse_primary
  alternative = if kind == :token_else
                  @pos += 1
                  parse_primary
                end

  TernaryExpression.new(consequence.token, consequence, condition, alternative)
end

#parse_true_literal ⇒ Expression

() -> Expression

Returns:



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# File 'lib/luoma/parser_unified.rb', line 738

def parse_true_literal
  token = self.next
  if PATH_PUNCTUATION.include?(kind)
    @pos -= 1
    parse_path
  else
    BooleanLiteral.new(token, true)
  end
end

#unescape(token) ⇒ String

Signature:

  • (t_token) -> String

Parameters:

  • token (t_token)

Returns:

  • (String) 


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# File 'lib/luoma/parser_unified.rb', line 867

def unescape(token)
  unescaped = [] # : Array[String]
  scanner = StringScanner.new(Luoma.get_token_value(token, @source))

  until scanner.eos?
    if scanner.scan(RE_SLASH_U)
      code_point = (scanner.captures&.first || raise).to_i(16)

      if low_surrogate?(code_point)
        raise TemplateSyntaxError.new(
          "unexpected low surrogate",
          token,
          @source,
          @template_name
        )
      end

      if high_surrogate?(code_point)
        unless scanner.scan(RE_SLASH_U)
          raise TemplateSyntaxError.new(
            "expected low surrogate",
            token,
            @source,
            @template_name
          )
        end

        low_surrogate = (scanner.captures&.first || raise).to_i(16)

        unless low_surrogate?(low_surrogate)
          raise TemplateSyntaxError.new(
            "expected low surrogate",
            token,
            @source,
            @template_name
          )
        end

        code_point = 0x10000 + (
          ((code_point & 0x03FF) << 10) | (low_surrogate & 0x03FF)
        )
      end

      unescaped << code_point.chr(Encoding::UTF_8)
      next
    end

    if scanner.scan(RE_ESCAPE_INTERPOLATION)
      unescaped << "${"
      next
    end

    ch = scanner.getch

    break if ch.nil?

    unless ch == "\\"
      unescaped << ch
      next
    end

    ch = scanner.getch

    case ch
    when "\""
      unescaped << "\""
    when "'"
      unescaped << "'"
    when "\\"
      unescaped << "\\"
    when "/"
      unescaped << "/"
    when "b"
      unescaped << "\x08"
    when "f"
      unescaped << "\x0c"
    when "n"
      unescaped << "\n"
    when "r"
      unescaped << "\r"
    when "t"
      unescaped << "\t"
    when nil
      raise TemplateSyntaxError.new(
        "incomplete escape sequence",
        token,
        @source,
        @template_name
      )
    else
      raise TemplateSyntaxError.new(
        "unknown escape sequence",
        token,
        @source,
        @template_name
      )
    end
  end

  unescaped.join
end