Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/ruby_sscanf.rb

Overview

The String class is monkey patched to support sscanf.

Constant Summary collapse

RSF_DECIMAL =

A regular expression for decimal integers.

/[+-]?\d+/
RSF_UNSIGNED =

A regular expression for unsigned decimal integers.

/[+]?\d+/
RSF_HEX_PARSE = 
lambda {parse(rsf_hex) ? dst << found.to_i(16) : :break}
RSF_HEX_SKIP = 
lambda {parse(rsf_hex) || :break}
RSF_OCTAL =

A regular expression for octal integers.

/[+-]?(0[oO])?[0-7]+/
RSF_BINARY =

A regular expression for binary integers.

/[+-]?(0[bB])?[01]+/
RSF_INTEGER =

A regular expression for flexible base integers.

/[+-]?((0[xX]\h+)|(0[bB][01]+)|(0[oO]?[0-7]*)|([1-9]\d*))/
RSF_FLOAT_PARSE = 
lambda {parse(rsf_float) ? dst << found.to_f : :break}
RSF_FLOAT_SKIP = 
lambda {parse(rsf_float) || :break}
RSF_RATIONAL =

A regular expression for rational numbers.

/[+-]?\d+\/\d+(r)?/
RSF_COMPLEX =

A regular expression for complex numbers.

%r{(?<num> \d+(\.\d+)?([eE][+-]?\d+)?){0}
 [+-]?\g<num>[+-]\g<num>[ij]
}x
RSF_STRING =

A regular expression for a string.

/\S+/
RSF_QUOTED =

A regular expression for quoted strings.

/("([^\\"]|\\.)*")|('([^\\']|\\.)*')/
RSF_RGX =

The standard handlers for formats with embedded regular expressions.

lambda {parse(fmt.regex) ? dst << found : :break}
RSF_RGX_SKIP = 
lambda {parse(fmt.regex) || :break}

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.get_parser_engine ⇒ Object

Get the parsing engine. This is cached on a per-thread basis. That is to say, each thread gets its own FormatEngine::Engine instance.



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# File 'lib/ruby_sscanf.rb', line 53

def self.get_parser_engine

  Thread.current[:ruby_sscanf_engine] ||= FormatEngine::Engine.new(
    "%a"  => RSF_FLOAT_PARSE,
    "%*a" => RSF_FLOAT_SKIP,

    "%A"  => RSF_FLOAT_PARSE,
    "%*A" => RSF_FLOAT_SKIP,

    "%b"  => lambda {parse(RSF_BINARY) ? dst << found.to_i(2) : :break},
    "%*b" => lambda {parse(RSF_BINARY) || :break},

    "%c"  => lambda {dst << grab},
    "%*c" => lambda {grab},

    "%d"  => lambda {parse(RSF_DECIMAL) ? dst << found.to_i : :break},
    "%*d" => lambda {parse(RSF_DECIMAL) || :break},

    "%e"  => RSF_FLOAT_PARSE,
    "%*e" => RSF_FLOAT_SKIP,

    "%E"  => RSF_FLOAT_PARSE,
    "%*E" => RSF_FLOAT_SKIP,

    "%f"  => RSF_FLOAT_PARSE,
    "%*f" => RSF_FLOAT_SKIP,

    "%F"  => RSF_FLOAT_PARSE,
    "%*F" => RSF_FLOAT_SKIP,

    "%g"  => RSF_FLOAT_PARSE,
    "%*g" => RSF_FLOAT_SKIP,

    "%G"  => RSF_FLOAT_PARSE,
    "%*G" => RSF_FLOAT_SKIP,

    "%i"  => lambda {parse(RSF_INTEGER) ? dst << found.to_i(0) : :break},
    "%*i" => lambda {parse(RSF_INTEGER) || :break},

    "%j"  => lambda {parse(RSF_COMPLEX) ? dst << Complex(found) : :break},
    "%*j" => lambda {parse(RSF_COMPLEX) || :break},

    "%o"  => lambda {parse(RSF_OCTAL) ? dst << found.to_i(8) : :break},
    "%*o" => lambda {parse(RSF_OCTAL) || :break},

    "%q"  => lambda do
      if parse(RSF_QUOTED)
        dst << found[1..-2].gsub(/\\./) {|seq| seq[-1]}
      else
        :break
      end
    end,

    "%*q" => lambda {parse(RSF_QUOTED) || :break},

    "%r"  => lambda {parse(RSF_RATIONAL) ? dst << found.to_r : :break},
    "%*r" => lambda {parse(RSF_RATIONAL) || :break},

    "%s"  => lambda {parse(RSF_STRING) ? dst << found : :break},
    "%*s" => lambda {parse(RSF_STRING) || :break},

    "%u"  => lambda {parse(RSF_UNSIGNED) ? dst << found.to_i : :break},
    "%*u" => lambda {parse(RSF_UNSIGNED) || :break},

    "%x"  => RSF_HEX_PARSE,
    "%*x" => RSF_HEX_SKIP,

    "%X"  => RSF_HEX_PARSE,
    "%*X" => RSF_HEX_SKIP,

    "%["  => RSF_RGX,
    "%*[" => RSF_RGX_SKIP,

    "%/"  => RSF_RGX,
    "%*/" => RSF_RGX_SKIP)
end

.sscanf_unparsed ⇒ Object

Get any unparsed text.



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# File 'lib/ruby_sscanf.rb', line 136

def self.sscanf_unparsed
  String.get_parser_engine.unparsed
end

Instance Method Details

#sscanf(format) ⇒ Object

Scan the formatted input.



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# File 'lib/ruby_sscanf.rb', line 131

def sscanf(format)
  String.get_parser_engine.do_parse(self, [], format)
end