Class: Psych::ScalarScanner
Overview
Scan scalars for built in types
Constant Summary collapse
- TIME =
Taken from yaml.org/type/timestamp.html
/^\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)?)?/
- FLOAT =
Taken from yaml.org/type/float.html
/^(?:[-+]?([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))$/x
Instance Method Summary collapse
-
#initialize ⇒ ScalarScanner
constructor
Create a new scanner.
-
#parse_time(string) ⇒ Object
Parse and return a Time from
string
. -
#tokenize(string) ⇒ Object
Tokenize
string
returning the ruby object.
Constructor Details
#initialize ⇒ ScalarScanner
Create a new scanner
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# File 'lib/psych/scalar_scanner.rb', line 17 def initialize @string_cache = {} end |
Instance Method Details
#parse_time(string) ⇒ Object
Parse and return a Time from string
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# File 'lib/psych/scalar_scanner.rb', line 93 def parse_time string date, time = *(string.split(/[ tT]/, 2)) (yy, m, dd) = date.split('-').map { |x| x.to_i } md = time.match(/(\d+:\d+:\d+)(?:\.(\d*))?\s*(Z|[-+]\d+(:\d\d)?)?/) (hh, mm, ss) = md[1].split(':').map { |x| x.to_i } us = (md[2] ? Rational("0.#{md[2]}") : 0) * 1000000 time = Time.utc(yy, m, dd, hh, mm, ss, us) return time if 'Z' == md[3] return Time.at(time.to_i, us) unless md[3] tz = md[3].match(/^([+\-]?\d{1,2})\:?(\d{1,2})?$/)[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) ⇒ Object
Tokenize string
returning the ruby object
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# File 'lib/psych/scalar_scanner.rb', line 22 def tokenize string return nil if string.empty? return string if @string_cache.key?(string) case string when /^[A-Za-z~]/ 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)$/i false else @string_cache[string] = true string end when TIME parse_time string when /^\d{4}-\d{1,2}-\d{1,2}$/ require 'date' Date.strptime(string, '%Y-%m-%d') when /^\.inf$/i 1 / 0.0 when /^-\.inf$/i -1 / 0.0 when /^\.nan$/i 0.0 / 0.0 when /^:./ if string =~ /^:(["'])(.*)\1/ $2.sub(/^:/, '').to_sym else string.sub(/^:/, '').to_sym end when /^[-+]?[1-9][0-9_]*(:[0-5]?[0-9])+$/ 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 return Float(string.gsub(/[,_]/, '')) rescue ArgumentError @string_cache[string] = true string else if string.count('.') < 2 return Integer(string.gsub(/[,_]/, '')) rescue ArgumentError end @string_cache[string] = true string end end |