class Psych::ScalarScanner
Scan scalars for built in types
Constants
- FLOAT
Taken from yaml.org/type/float.html
- INTEGER
Taken from yaml.org/type/int.html
- TIME
Taken from yaml.org/type/timestamp.html
Public Class Methods
new()
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Create a new scanner
# File ext/psych/lib/psych/scalar_scanner.rb, line 23 def initialize @string_cache = {} @symbol_cache = {} end
Public Instance Methods
parse_int(string)
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Parse and return an int from string
# File ext/psych/lib/psych/scalar_scanner.rb, line 112 def parse_int string return unless INTEGER === string Integer(string) end
parse_time(string)
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Parse and return a Time from string
# File ext/psych/lib/psych/scalar_scanner.rb, line 119 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
tokenize(string)
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Tokenize string
returning the ruby object
# File ext/psych/lib/psych/scalar_scanner.rb, line 29 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