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Edit File : scalar_scanner.rb \| Size : 4.01 KB
require 'strscan' module Psych ### # Scan scalars for built in types class ScalarScanner # Taken from http://yaml.org/type/timestamp.html TIME = /^\d{4}-\d{1,2}-\d{1,2}([Tt]\|\s+)\d{1,2}:\d\d:\d\d(\.\d)?(\sZ\|[-+]\d{1,2}(:\d\d)?)?/ # Taken from http://yaml.org/type/float.html FLOAT = /^(?:[-+]?([0-9][0-9_,])?\.[0-9]([eE][-+][0-9]+)?(?# base 10) \|[-+]?[0-9][0-9_,](:[0-5]?[0-9])+\.[0-9_](?# base 60) \|[-+]?\.(inf\|Inf\|INF)(?# infinity) \|\.(nan\|NaN\|NAN)(?# not a number))$/x # Taken from http://yaml.org/type/int.html INTEGER = /^(?:[-+]?0b[0-1_]+ (?# base 2) \|[-+]?0[0-7_]+ (?# base 8) \|[-+]?(?:0\|[1-9][0-9_]) (?# base 10) \|[-+]?0x[0-9a-fA-F_]+ (?# base 16))$/x # Create a new scanner def initialize @string_cache = {} @symbol_cache = {} end # Tokenize +string+ returning the ruby object def tokenize string return nil if string.empty? return string if @string_cache.key?(string) return @symbol_cache[string] if @symbol_cache.key?(string) case string # Check for a String type, being careful not to get caught by hash keys, hex values, and # special floats (e.g., -.inf). when /^[^\d\.:-]?[A-Za-z_\s!@#\$%\^&\\(\)\{\}\<\>\\|\/\\~;=]+/ if string.length > 5 @string_cache[string] = true return string end case string when /^[^ytonf~]/i @string_cache[string] = true string when '~', /^null$/i nil when /^(yes\|true\|on)$/i true when /^(no\|false\|off)$/i false else @string_cache[string] = true string end when TIME begin parse_time string rescue ArgumentError string end when /^\d{4}-(?:1[012]\|0\d\|\d)-(?:[12]\d\|3[01]\|0\d\|\d)$/ require 'date' begin Date.strptime(string, '%Y-%m-%d') rescue ArgumentError string end when /^\.inf$/i Float::INFINITY when /^-\.inf$/i -Float::INFINITY when /^\.nan$/i Float::NAN when /^:./ if string =~ /^:(["'])(.)\1/ @symbol_cache[string] = $2.sub(/^:/, '').to_sym else @symbol_cache[string] = string.sub(/^:/, '').to_sym end when /^[-+]?[0-9][0-9_](:[0-5]?[0-9])+$/ i = 0 string.split(':').each_with_index do \|n,e\| i += (n.to_i * 60 ** (e - 2).abs) end i when /^[-+]?[0-9][0-9_](:[0-5]?[0-9])+\.[0-9_]$/ i = 0 string.split(':').each_with_index do \|n,e\| i += (n.to_f * 60 ** (e - 2).abs) end i when FLOAT if string == '.' @string_cache[string] = true string else Float(string.gsub(/[,_]\|\.$/, '')) end else int = parse_int string.gsub(/[,_]/, '') return int if int @string_cache[string] = true string end end ### # Parse and return an int from +string+ def parse_int string return unless INTEGER === string Integer(string) end ### # Parse and return a Time from +string+ def parse_time string date, time = (string.split(/[ tT]/, 2)) (yy, m, dd) = date.split('-').map { \|x\| x.to_i } md = time.match(/(\d+:\d+:\d+)(?:\.(\d))?\s(Z\|[-+]\d+(:\d\d)?)?/) (hh, mm, ss) = md[1].split(':').map { \|x\| x.to_i } us = (md[2] ? Rational("0.#{md[2]}") : 0) 1000000 time = Time.utc(yy, m, dd, hh, mm, ss, us) return time if 'Z' == md[3] return Time.at(time.to_i, us) unless md[3] tz = md[3].match(/^([+\-]?\d{1,2})\:?(\d{1,2})?$/)[1..-1].compact.map { \|digit\| Integer(digit, 10) } offset = tz.first * 3600 if offset < 0 offset -= ((tz[1] \|\| 0) * 60) else offset += ((tz[1] \|\| 0) * 60) end Time.at((time - offset).to_i, us) end end end Back

Edit File : scalar_scanner.rb | Size : 4.01 KB

require 'strscan'

module Psych
  ###
  # Scan scalars for built in types
  class ScalarScanner
    # Taken from http://yaml.org/type/timestamp.html
    TIME = /^\d{4}-\d{1,2}-\d{1,2}([Tt]|\s+)\d{1,2}:\d\d:\d\d(\.\d*)?(\s*Z|[-+]\d{1,2}(:\d\d)?)?/

# Taken from http://yaml.org/type/float.html
    FLOAT = /^(?:[-+]?([0-9][0-9_,]*)?\.[0-9]*([eE][-+][0-9]+)?(?# base 10)
              |[-+]?[0-9][0-9_,]*(:[0-5]?[0-9])+\.[0-9_]*(?# base 60)
              |[-+]?\.(inf|Inf|INF)(?# infinity)
              |\.(nan|NaN|NAN)(?# not a number))$/x

# Taken from http://yaml.org/type/int.html
    INTEGER = /^(?:[-+]?0b[0-1_]+          (?# base 2)
                  |[-+]?0[0-7_]+           (?# base 8)
                  |[-+]?(?:0|[1-9][0-9_]*) (?# base 10)
                  |[-+]?0x[0-9a-fA-F_]+    (?# base 16))$/x

# Create a new scanner
    def initialize
      @string_cache = {}
      @symbol_cache = {}
    end

# Tokenize +string+ returning the ruby object
    def tokenize string
      return nil if string.empty?
      return string if @string_cache.key?(string)
      return @symbol_cache[string] if @symbol_cache.key?(string)

case string
      # Check for a String type, being careful not to get caught by hash keys, hex values, and
      # special floats (e.g., -.inf).
      when /^[^\d\.:-]?[A-Za-z_\s!@#\$%\^&\*\{\}\<\>\|\/\\~;=]+/
        if string.length > 5
          @string_cache[string] = true
          return string
        end

case string
        when /^[^ytonf~]/i
          @string_cache[string] = true
          string
        when '~', /^null$/i
          nil
        when /^(yes|true|on)$/i
          true
        when /^(no|false|off)$/i
          false
        else
          @string_cache[string] = true
          string
        end
      when TIME
        begin
          parse_time string
        rescue ArgumentError
          string
        end
      when /^\d{4}-(?:1[012]|0\d|\d)-(?:[12]\d|3[01]|0\d|\d)$/
        require 'date'
        begin
          Date.strptime(string, '%Y-%m-%d')
        rescue ArgumentError
          string
        end
      when /^\.inf$/i
        Float::INFINITY
      when /^-\.inf$/i
        -Float::INFINITY
      when /^\.nan$/i
        Float::NAN
      when /^:./
        if string =~ /^:(["'])(.*)\1/
          @symbol_cache[string] = $2.sub(/^:/, '').to_sym
        else
          @symbol_cache[string] = string.sub(/^:/, '').to_sym
        end
      when /^[-+]?[0-9][0-9_]*(:[0-5]?[0-9])+$/
        i = 0
        string.split(':').each_with_index do |n,e|
          i += (n.to_i * 60 ** (e - 2).abs)
        end
        i
      when /^[-+]?[0-9][0-9_]*(:[0-5]?[0-9])+\.[0-9_]*$/
        i = 0
        string.split(':').each_with_index do |n,e|
          i += (n.to_f * 60 ** (e - 2).abs)
        end
        i
      when FLOAT
        if string == '.'
          @string_cache[string] = true
          string
        else
          Float(string.gsub(/[,_]|\.$/, ''))
        end
      else
        int = parse_int string.gsub(/[,_]/, '')
        return int if int

@string_cache[string] = true
        string
      end
    end

###
    # Parse and return an int from +string+
    def parse_int string
      return unless INTEGER === string
      Integer(string)
    end

###
    # Parse and return a Time from +string+
    def parse_time string
      date, time = *(string.split(/[ tT]/, 2))
      (yy, m, dd) = date.split('-').map { |x| x.to_i }
      md = time.match(/(\d+:\d+:\d+)(?:\.(\d*))?\s*(Z|[-+]\d+(:\d\d)?)?/)

(hh, mm, ss) = md[1].split(':').map { |x| x.to_i }
      us = (md[2] ? Rational("0.#{md[2]}") : 0) * 1000000

time = Time.utc(yy, m, dd, hh, mm, ss, us)

return time if 'Z' == md[3]
      return Time.at(time.to_i, us) unless md[3]

tz = md[3].match(/^([+\-]?\d{1,2})\:?(\d{1,2})?$/)[1..-1].compact.map { |digit| Integer(digit, 10) }
      offset = tz.first * 3600

if offset < 0
        offset -= ((tz[1] || 0) * 60)
      else
        offset += ((tz[1] || 0) * 60)
      end

Time.at((time - offset).to_i, us)
    end
  end
end

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