Module: Pray::Literal

Defined in:
lib/pray/literal.rb

Defined Under Namespace

Classes: LiteralValue, Parser

Class Method Summary collapse

Class Method Details

.find_top_level(input, token) ⇒ Object 



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# File 'lib/pray/literal.rb', line 56

def find_top_level(input, token)
  depth = 0
  quote = nil
  escaped = false
  index = 0

  while index < input.length
    character = input[index]
    if quote
      if escaped
        escaped = false
      elsif character == "\\"
        escaped = true
      elsif character == quote
        quote = nil
      end
      index += 1
      next
    end

    case character
    when '"', "'"
      quote = character
    when "[", "{", "("
      depth += 1
    when "]", "}", ")"
      depth -= 1
    else
      return index if depth.zero? && input[index..].start_with?(token)
    end
    index += 1
  end
  nil
end

.is_balanced?(input) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pray/literal.rb', line 91

def is_balanced?(input)
  depth = 0
  quote = nil
  escaped = false

  input.each_char do |character|
    if quote
      if escaped
        escaped = false
      elsif character == "\\"
        escaped = true
      elsif character == quote
        quote = nil
      end
      next
    end

    case character
    when '"', "'"
      quote = character
    when "[", "{", "("
      depth += 1
    when "]", "}", ")"
      depth -= 1
    end
  end

  depth.zero? && quote.nil?
end

.parse_literal(input) ⇒ Object 



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# File 'lib/pray/literal.rb', line 121

def parse_literal(input)
  parser = Parser.new(input)
  value = parser.parse_value
  parser.skip_whitespace
  unless parser.finished?
    raise Error.parse("literal", "unexpected trailing input near #{parser.remaining.inspect}")
  end
  value
end

.parse_literal_array(input) ⇒ Object 



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# File 'lib/pray/literal.rb', line 138

def parse_literal_array(input)
  value = parse_literal(input)
  raise Error.parse("literal", "expected array literal, found #{value.inspect}") unless value.kind == :array

  value.value
end

.parse_literal_map(input) ⇒ Object 



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# File 'lib/pray/literal.rb', line 131

def parse_literal_map(input)
  value = parse_literal(input)
  raise Error.parse("literal", "expected map literal, found #{value.inspect}") unless value.kind == :map

  value.value
end

.prepare_parser_line(line) ⇒ Object 



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# File 'lib/pray/literal.rb', line 149

def prepare_parser_line(line)
  strip_line_comment(line).rstrip
end

.prepare_parser_lines(text) ⇒ Object 



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# File 'lib/pray/literal.rb', line 145

def prepare_parser_lines(text)
  text.lines.map { |line| prepare_parser_line(line) }
end

.split_top_level(input, separator) ⇒ Object 



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# File 'lib/pray/literal.rb', line 16

def split_top_level(input, separator)
  output = []
  start = 0
  depth = 0
  quote = nil
  escaped = false

  input.each_char.with_index do |character, index|
    if quote
      if escaped
        escaped = false
      elsif character == "\\"
        escaped = true
      elsif character == quote
        quote = nil
      end
      next
    end

    case character
    when '"', "'"
      quote = character
    when "[", "{", "("
      depth += 1
    when "]", "}", ")"
      depth -= 1
    else
      if character == separator && depth.zero?
        segment = input[start...index].strip
        output << segment unless segment.empty?
        start = index + 1
      end
    end
  end

  tail = input[start..].strip
  output << tail unless tail.empty?
  output
end

.strip_line_comment(line) ⇒ Object 



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# File 'lib/pray/literal.rb', line 153

def strip_line_comment(line)
  quote = nil
  escaped = false
  line.each_char.with_index do |character, index|
    if quote
      if escaped
        escaped = false
      elsif character == "\\"
        escaped = true
      elsif character == quote
        quote = nil
      end
      next
    end

    case character
    when '"', "'"
      quote = character
    when "#"
      return line[0...index]
    end
  end
  line
end