class Psych::ScalarScanner
Scan scalars for built in types
Constants
- FLOAT
Taken from yaml.org/type/float.html Base 60, [-+]inf and NaN are handled separately
- INTEGER_LEGACY
Same as above, but allows commas. Not to YML spec, but kept for backwards compatibility
- INTEGER_STRICT
Taken from yaml.org/type/int.html
- TIME
Taken from yaml.org/type/timestamp.html
Attributes
class_loader[R]
Public Class Methods
new(class_loader, strict_integer: false)
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Create a new scanner
# File psych/lib/psych/scalar_scanner.rb, line 30 def initialize class_loader, strict_integer: false @symbol_cache = {} @class_loader = class_loader @strict_integer = strict_integer end
Public Instance Methods
parse_int(string)
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Parse and return an int from string
# File psych/lib/psych/scalar_scanner.rb, line 109 def parse_int string Integer(string.delete(',_')) end
parse_time(string)
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Parse and return a Time from string
# File psych/lib/psych/scalar_scanner.rb, line 115 def parse_time string klass = class_loader.load 'Time' date, time = *(string.split(/[ tT]/, 2)) (yy, m, dd) = date.match(/^(-?\d{4})-(\d{1,2})-(\d{1,2})/).captures.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})?$/)[1..-1].compact.map { |digit| Integer(digit, 10) } offset = tz.first * 3600 if offset < 0 offset -= ((tz[1] || 0) * 60) else offset += ((tz[1] || 0) * 60) end klass.new(yy, m, dd, hh, mm, ss+us/(1_000_000r), offset) end
tokenize(string)
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Tokenize string
returning the Ruby object
# File psych/lib/psych/scalar_scanner.rb, line 37 def tokenize string return nil if string.empty? return @symbol_cache[string] if @symbol_cache.key?(string) integer_regex = @strict_integer ? INTEGER_STRICT : INTEGER_LEGACY # Check for a String type, being careful not to get caught by hash keys, hex values, and # special floats (e.g., -.inf). if string.match?(%r{^[^\d.:-]?[[:alpha:]_\s!@#$%\^&*(){}<>|/\\~;=]+}) || string.match?(/\n/) return string if string.length > 5 if string.match?(/^[^ytonf~]/i) string elsif string == '~' || string.match?(/^null$/i) nil elsif string.match?(/^(yes|true|on)$/i) true elsif string.match?(/^(no|false|off)$/i) false else string end elsif string.match?(TIME) begin parse_time string rescue ArgumentError string end elsif string.match?(/^\d{4}-(?:1[012]|0\d|\d)-(?:[12]\d|3[01]|0\d|\d)$/) require 'date' begin class_loader.date.strptime(string, '%F', Date::GREGORIAN) rescue ArgumentError string end elsif string.match?(/^\+?\.inf$/i) Float::INFINITY elsif string.match?(/^-\.inf$/i) -Float::INFINITY elsif string.match?(/^\.nan$/i) Float::NAN elsif string.match?(/^:./) if string =~ /^:(["'])(.*)\1/ @symbol_cache[string] = class_loader.symbolize($2.sub(/^:/, '')) else @symbol_cache[string] = class_loader.symbolize(string.sub(/^:/, '')) end elsif string.match?(/^[-+]?[0-9][0-9_]*(:[0-5]?[0-9]){1,2}$/) i = 0 string.split(':').each_with_index do |n,e| i += (n.to_i * 60 ** (e - 2).abs) end i elsif string.match?(/^[-+]?[0-9][0-9_]*(:[0-5]?[0-9]){1,2}\.[0-9_]*$/) i = 0 string.split(':').each_with_index do |n,e| i += (n.to_f * 60 ** (e - 2).abs) end i elsif string.match?(FLOAT) if string.match?(/\A[-+]?\.\Z/) string else Float(string.delete(',_').gsub(/\.([Ee]|$)/, '\1')) end elsif string.match?(integer_regex) parse_int string else string end end