module Malady::Reader

Public Instance Methods

parse_string(string) click to toggle source
# File lib/malady/reader.rb, line 4
def parse_string(string)
  read_str(string)
end
read_atom(token) click to toggle source
# File lib/malady/reader.rb, line 35
def read_atom(token)
  case token
  when /^-?\d+$/
    [:integer, token.to_i]
  when 'true'
    [:boolean, :true]
  when 'false'
    [:boolean, :false]
  when /^\D+$/
    [:symbol, token]
  else
    raise 'Reader error: Unknown token'
  end
end
read_form(tokens) click to toggle source
# File lib/malady/reader.rb, line 13
def read_form(tokens)
  if tokens.first =~ /(\(|\[)/
    read_list(tokens)
  else
    read_atom(tokens.shift)
  end
end
read_list(tokens) click to toggle source
# File lib/malady/reader.rb, line 21
def read_list(tokens)
  raise 'Reader error: read_list called on non-list' if tokens.shift !~ /(\(|\[)/
  list = [:list]

  while tokens.first !~ /(\)|\])/
    raise 'Reader error: Unmatched parens' if tokens.empty?
    list << read_form(tokens)
  end

  tokens.shift # pop our closing paren

  list
end
read_str(string) click to toggle source
# File lib/malady/reader.rb, line 8
def read_str(string)
  tokens = tokenizer(string)
  read_form(tokens)
end
tokenizer(string) click to toggle source
# File lib/malady/reader.rb, line 50
def tokenizer(string)
  pos = 0
  re = /[\s,]*(~@|[\[\]{}()'`~^@]|"(?:\\.|[^\\"])*"|;.*|[^\s\[\]{}('"`,;)]*)/
  result = []
  while (m = re.match(string, pos)) && pos < string.size
    result << m.to_s.strip
    pos = m.end(0)
  end
  result
end