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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 attr_reader :class_loader # Create a new scanner def initialize class_loader @string_cache = {} @symbol_cache = {} @class_loader = class_loader 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 class_loader.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] = class_loader.symbolize($2.sub(/^:/, '')) else @symbol_cache[string] = class_loader.symbolize(string.sub(/^:/, '')) end when /^[-+]?[0-9][0-9_]*(:[0-5]?[0-9])+$/ 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 klass = class_loader.load 'Time' 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 = klass.utc(yy, m, dd, hh, mm, ss, us) return time if 'Z' == md[3] return klass.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 klass.at((time - offset).to_i, us) end end end
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