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parser.cr
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parser.cr
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struct Time::Format
# :nodoc:
struct Parser
include Pattern
# :nodoc:
RFC_2822_LOCATIONS = {
"UT" => Location::UTC,
"GMT" => Location::UTC,
"EST" => Location.fixed("EST", -5 * 3600),
"EDT" => Location.fixed("EDT", -4 * 3600),
"CST" => Location.fixed("CST", -6 * 3600),
"CDT" => Location.fixed("CDT", -5 * 3600),
"MST" => Location.fixed("MST", -7 * 3600),
"MDT" => Location.fixed("MDT", -6 * 3600),
"PST" => Location.fixed("PST", -8 * 3600),
"PDT" => Location.fixed("PDT", -7 * 3600),
}
@unix_seconds : Int64?
@location : Location?
@calendar_week_week : Int32?
@calendar_week_year : Int32?
@day_of_week : Time::DayOfWeek?
def initialize(string)
@reader = Char::Reader.new(string)
@year = 1
@month = 1
@day = 1
@hour = 0
@minute = 0
@second = 0
@nanosecond = 0
@pm = false
@nanosecond_offset = 0_i64
end
def time(location : Location? = nil)
@hour += 12 if @pm
if unix_seconds = @unix_seconds
return Time.unix(unix_seconds)
end
location = @location || location
if location.nil?
raise "Time format did not include time zone and no default location provided", pos: false
end
if (calendar_week_week = @calendar_week_week) && (calendar_week_year = @calendar_week_year) && (day_of_week = @day_of_week)
# If all components of a week date are available, they are used to create a Time instance
time = Time.week_date calendar_week_year, calendar_week_week, day_of_week, @hour, @minute, @second, nanosecond: @nanosecond, location: location
else
time = Time.local @year, @month, @day, @hour, @minute, @second, nanosecond: @nanosecond, location: location
end
time = time.shift 0, @nanosecond_offset
time
end
def year
@year = consume_number(4)
end
def year_modulo_100
year = consume_number(2)
if 69 <= year <= 99
@year = year + 1900
elsif 0 <= year
@year = year + 2000
else
raise "Invalid year"
end
end
def year_divided_by_100
@year = consume_number(2) * 100
end
def full_or_short_year
@year = case year = consume_number(4)
when 0..49
year + 2000
when 50..999
year + 1900
else
year
end
end
def calendar_week_year
@calendar_week_year = consume_number(4)
end
def calendar_week_year_modulo100
@calendar_week_year = consume_number(2)
end
def month
@month = consume_number(2)
end
def month_zero_padded
month
end
def month_blank_padded
@month = consume_number_blank_padded(2)
end
def month_name
string = consume_string
if string.size < 3
raise "Invalid month"
end
string = string.capitalize
index = MONTH_NAMES.index &.starts_with?(string)
if index
@month = 1 + index
else
raise "Invalid month"
end
end
def month_name_upcase
month_name
end
def short_month_name
string = consume_string
if string.size != 3
raise "Invalid month"
end
string = string.capitalize
index = MONTH_NAMES.index &.starts_with?(string)
if index
@month = 1 + index
else
raise "Invalid month"
end
end
def short_month_name_upcase
month_name
end
def calendar_week_week
@calendar_week_week = consume_number(2)
end
def day_of_month
@day = consume_number(2)
end
def day_of_month_zero_padded
@day = consume_number(2)
end
def day_of_month_blank_padded
@day = consume_number_blank_padded(2)
end
def day_name
string = consume_string
if string.size < 3
raise "Invalid day name"
end
string = string.capitalize
index = DAY_NAMES.index &.starts_with?(string)
unless index
raise "Invalid day name"
end
end
def day_name_upcase
day_name
end
def short_day_name
day_name
end
def short_day_name_upcase
day_name
end
def short_day_name_with_comma?
return unless current_char.ascii_letter?
short_day_name
char ','
whitespace
end
def day_of_year_zero_padded
# TODO
consume_number(3)
end
def hour_24_zero_padded
@hour = consume_number(2)
end
def hour_24_blank_padded
@hour = consume_number_blank_padded(2)
end
def hour_12_zero_padded
hour_24_zero_padded
end
def hour_12_blank_padded
@hour = consume_number_blank_padded(2)
end
def minute
@minute = consume_number(2)
end
def second
@second = consume_number(2)
end
def milliseconds
second_decimals 3
end
def microseconds
second_decimals 6
end
def nanoseconds
second_decimals 9
end
def second_fraction
second_decimals 9
# consume trailing numbers
while current_char.ascii_number?
next_char
end
end
private def second_decimals(precision)
pos = @reader.pos
# Consume at most *precision* digits as i64
decimals = consume_number_i64(precision)
# Multiply the parsed value if does not match the expected precision
digits = @reader.pos - pos
precision_shift = digits < precision ? precision - digits : 0
# Adjust to nanoseconds
nanoseconds_shift = 9 - precision
@nanosecond = (decimals * 10 ** (precision_shift + nanoseconds_shift)).to_i
end
def second_fraction?(fraction_digits = nil)
if current_char == '.'
next_char
nanoseconds
end
end
def am_pm
string = consume_string
case string.downcase
when "am"
# skip
when "pm"
@pm = true
else
raise "Invalid am/pm"
end
end
def am_pm_upcase
am_pm
end
def day_of_week_monday_1_7
@day_of_week = Time::DayOfWeek.from_value(consume_number(1))
end
def day_of_week_sunday_0_6
@day_of_week = Time::DayOfWeek.from_value(consume_number(1))
end
def unix_seconds
negative = false
case current_char
when '-'
negative = true
next_char
when '+'
next_char
end
@unix_seconds = consume_number_i64(19) * (negative ? -1 : 1)
end
def time_zone(with_seconds = false)
case char = current_char
when 'Z'
time_zone_z
when 'U'
if next_char == 'T' && next_char == 'C'
@location = Location::UTC
next_char
else
raise "Invalid timezone"
end
when '-', '+'
time_zone_offset
else
raise "Invalid timezone"
end
end
def time_zone_z_or_offset(**options)
case char = current_char
when 'Z', 'z'
time_zone_z
when '-', '+'
time_zone_offset(**options)
else
raise "Invalid timezone"
end
end
def time_zone_z
raise "Invalid timezone" unless {'Z', 'z'}.includes? current_char
@location = Location::UTC
next_char
end
def time_zone_offset(force_colon = false, allow_colon = true, format_seconds = false, parse_seconds = true, force_zero_padding = true, force_minutes = true)
case current_char
when '-'
sign = -1
when '+'
sign = 1
else
raise "Invalid timezone"
end
char = next_char
raise "Invalid timezone" unless char.ascii_number?
hours = char.to_i
char = next_char
if char.ascii_number?
hours = hours * 10 + char.to_i
char = next_char
elsif force_zero_padding
raise "Invalid timezone"
end
if char == ':'
raise "Invalid timezone" unless allow_colon
char = next_char
elsif force_colon
raise "Invalid timezone"
end
if char.ascii_number?
minutes = char.to_i
char = next_char
if char.ascii_number?
minutes = minutes * 10 + char.to_i
char = next_char
elsif force_zero_padding
raise "Invalid timezone"
end
elsif force_minutes
raise "Invalid timezone"
else
minutes = 0
end
seconds = 0
if @reader.has_next? && parse_seconds
pos = @reader.pos
if char == ':'
char = next_char
raise "Invalid timezone" unless char.ascii_number?
elsif force_colon && char.ascii_number?
raise "Invalid timezone"
end
if char.ascii_number?
seconds = char.to_i
char = next_char
raise "Invalid timezone" unless char.ascii_number?
seconds = seconds * 10 + char.to_i
next_char
else
@reader.pos = pos
end
end
@location = Location.fixed(sign * (3600 * hours + 60 * minutes + seconds))
end
def time_zone_colon
time_zone
end
def time_zone_colon_with_seconds
time_zone(with_seconds: true)
end
def time_zone_gmt
consume_string == "GMT" || raise "Invalid timezone"
@location = Location::UTC
end
def time_zone_rfc2822
case char = current_char
when '-', '+'
time_zone_offset(allow_colon: false)
else
zone = consume_string
@location = RFC_2822_LOCATIONS.fetch(zone, Location::UTC)
end
end
def time_zone_gmt_or_rfc2822(**options)
time_zone_rfc2822
end
def char?(char, *alternatives)
if current_char == char || alternatives.includes?(current_char)
next_char
true
else
false
end
end
def char(char, *alternatives)
unless char?(char, *alternatives)
raise "Unexpected char: #{current_char.inspect}"
end
end
def consume_number(max_digits)
consume_number_i64(max_digits).to_i
end
def consume_number?(max_digits)
consume_number_i64?(max_digits).try(&.to_i)
end
def consume_number_i64(max_digits)
consume_number_i64?(max_digits) || raise "Invalid number"
end
def consume_number_i64?(max_digits)
n = 0_i64
char = current_char
if char.ascii_number?
n = (char - '0').to_i64
char = next_char
else
return nil
end
max_digits -= 1
while max_digits > 0 && char.ascii_number?
n = n * 10 + (char - '0')
char = next_char
max_digits -= 1
end
n
end
def consume_number_blank_padded(max_digits)
if current_char.ascii_whitespace?
max_digits -= 1
next_char
end
consume_number(max_digits)
end
def consume_string
start_pos = @reader.pos
while current_char.ascii_letter?
next_char
end
@reader.string.byte_slice(start_pos, @reader.pos - start_pos)
end
def skip_space
next_char if current_char.ascii_whitespace?
end
def skip_spaces
while current_char.ascii_whitespace?
next_char
end
end
def whitespace
unless current_char.ascii_whitespace?
::raise "Unexpected char: #{current_char.inspect}"
end
next_char
end
def current_char
@reader.current_char
end
def next_char
@reader.next_char
end
def raise(message, pos = @reader.pos)
string = @reader.string
if pos.is_a?(Int)
string = "#{string.byte_slice(0, pos)}>>#{string.byte_slice(pos, string.bytesize - pos)}"
::raise Error.new("#{message} at #{@reader.pos}: #{string.inspect}")
else
::raise Error.new("#{message}: #{string.inspect}")
end
end
end
end