Module: TL1::AST

Defined in:
lib/tl1/ast.rb

Overview

Namespace for AST Nodes in input and output formats

Defined Under Namespace

Classes: ColonSeparatedVariables, CommaSeparatedKeywordVariables, CommaSeparatedVariables, Literal, Node, Variable

Constant Summary collapse

NODES_BY_NAME =

class Variable

[
  ColonSeparatedVariables,
  CommaSeparatedKeywordVariables,
  CommaSeparatedVariables,
  Literal,
  Variable
].map { |n| [n.to_s.split('::').last, n] }.to_h.freeze
NODES_BY_CLASS = 
NODES_BY_NAME.invert.freeze

Class Method Summary collapse

Class Method Details

.colon_separated_element(source) ⇒ Object 



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# File 'lib/tl1/ast.rb', line 11

module_function def colon_separated_element(source)
  return from_json(source) if source.is_a?(Hash)
  raise "Unparseable element #{source}" unless source.is_a?(String)

  if source.include?('=')
    CommaSeparatedKeywordVariables.parse(source)
  elsif source.include?(',')
    CommaSeparatedVariables.parse(source)
  elsif source.start_with?('<') && source.end_with?('>')
    Variable.parse(source)
  else
    Literal.parse(source)
  end
end

.from_json(source) ⇒ Object 



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# File 'lib/tl1/ast.rb', line 26

module_function def from_json(source)
  node = NODES_BY_NAME.fetch(source['node']) do
    raise "Unknown node type #{source['node']}"
  end

  node.parse(source['fields'])
end

.parse_message_format(source) ⇒ Object 



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# File 'lib/tl1/ast.rb', line 7

module_function def parse_message_format(source)
  ColonSeparatedVariables.parse(source)
end

.remove_quotes(string) ⇒ Object 



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# File 'lib/tl1/ast.rb', line 68

module_function def remove_quotes(string)
  if string.start_with?('"') && string.end_with?('"')
    string[1..-2]
  else
    string
  end
end

.split(string, delimiter) ⇒ Object 



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# File 'lib/tl1/ast.rb', line 34

module_function def split(string, delimiter)
  scanner = StringScanner.new(string)
  array = [String.new]

  loop do
    return array if scanner.eos?
    char = scanner.getch
    case char
    when delimiter
      array << String.new
    when '"'
      array.last << split_quoted(scanner)
    else
      array.last << char
    end
  end
end

.split_quoted(scanner) ⇒ Object 



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# File 'lib/tl1/ast.rb', line 52

module_function def split_quoted(scanner)
  string = String.new('"')

  loop do
    raise 'Unexpected end of quoted string' if scanner.eos?
    char = scanner.getch
    case char
    when '"'
      string << '"'
      return string
    else
      string << char
    end
  end
end