Module: Clojure::StringParser

Included in:
Parser
Defined in:
lib/str_parse.rb

Overview

Taken from the JSON parser at flori.github.com/json/

Constant Summary collapse

STRING = 
/" ((?:[^\x0-\x1f"\\] |
  # escaped special characters:
  \\["\\\/bfnrt] |
  \\u[0-9a-fA-F]{4} |
  # match all but escaped special characters:
  \\[\x20-\x21\x23-\x2e\x30-\x5b\x5d-\x61\x63-\x65\x67-\x6d\x6f-\x71\x73\x75-\xff])*)
"/nx
EMPTY_8BIT_STRING = 
''
UNESCAPE_MAP = 
Hash.new { |h, k| h[k] = k.chr }

Instance Method Summary collapse

Instance Method Details

#parse_string ⇒ Object 



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# File 'lib/str_parse.rb', line 14

def parse_string
  if scan(STRING)
    return '' if self[1].empty?

    string = self[1].gsub(%r((?:\\[\\bfnrt"/]|(?:\\u(?:[A-Fa-f\d]{4}))+|\\[\x20-\xff]))n) do |c|
      if u = UNESCAPE_MAP[$&[1]]
        u
      else # \uXXXX
        bytes = EMPTY_8BIT_STRING.dup
        i = 0
        while c[6 * i] == ?\\ && c[6 * i + 1] == ?u
          bytes << c[6 * i + 2, 2].to_i(16) << c[6 * i + 4, 2].to_i(16)
          i += 1
        end
    
        Iconv.iconv('utf-8', 'utf-16be', bytes)
      end
    end

    if string.respond_to?(:force_encoding)
      string.force_encoding(::Encoding::UTF_8)
    end

    string
  else
    :no_string
  end
rescue => e
  raise ParserError, "Caught #{e.class} at '#{peek(20)}': #{e}"
end