stable/freqtrade/configuration/timerange.py

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"""
This module contains the argument manager class
"""
import logging
import re
from typing import Optional
import arrow
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logger = logging.getLogger(__name__)
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class TimeRange:
"""
object defining timerange inputs.
[start/stop]type defines if [start/stop]ts shall be used.
if *type is None, don't use corresponding startvalue.
"""
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def __init__(self, starttype: Optional[str] = None, stoptype: Optional[str] = None,
startts: int = 0, stopts: int = 0):
self.starttype: Optional[str] = starttype
self.stoptype: Optional[str] = stoptype
self.startts: int = startts
self.stopts: int = stopts
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def __eq__(self, other):
"""Override the default Equals behavior"""
return (self.starttype == other.starttype and self.stoptype == other.stoptype
and self.startts == other.startts and self.stopts == other.stopts)
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def subtract_start(self, seconds: int) -> None:
"""
Subtracts <seconds> from startts if startts is set.
:param seconds: Seconds to subtract from starttime
:return: None (Modifies the object in place)
"""
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if self.startts:
self.startts = self.startts - seconds
def adjust_start_if_necessary(self, timeframe_secs: int, startup_candles: int,
min_date: arrow.Arrow) -> None:
"""
Adjust startts by <startup_candles> candles.
Applies only if no startup-candles have been available.
:param timeframe_secs: Timeframe in seconds e.g. `timeframe_to_seconds('5m')`
:param startup_candles: Number of candles to move start-date forward
:param min_date: Minimum data date loaded. Key kriterium to decide if start-time
has to be moved
:return: None (Modifies the object in place)
"""
if (not self.starttype or (startup_candles
and min_date.int_timestamp >= self.startts)):
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# If no startts was defined, or backtest-data starts at the defined backtest-date
logger.warning("Moving start-date by %s candles to account for startup time.",
startup_candles)
self.startts = (min_date.int_timestamp + timeframe_secs * startup_candles)
self.starttype = 'date'
@staticmethod
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def parse_timerange(text: Optional[str]) -> 'TimeRange':
"""
Parse the value of the argument --timerange to determine what is the range desired
:param text: value from --timerange
:return: Start and End range period
"""
if text is None:
return TimeRange(None, None, 0, 0)
syntax = [(r'^-(\d{8})$', (None, 'date')),
(r'^(\d{8})-$', ('date', None)),
(r'^(\d{8})-(\d{8})$', ('date', 'date')),
(r'^-(\d{10})$', (None, 'date')),
(r'^(\d{10})-$', ('date', None)),
(r'^(\d{10})-(\d{10})$', ('date', 'date')),
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(r'^-(\d{13})$', (None, 'date')),
(r'^(\d{13})-$', ('date', None)),
(r'^(\d{13})-(\d{13})$', ('date', 'date')),
]
for rex, stype in syntax:
# Apply the regular expression to text
match = re.match(rex, text)
if match: # Regex has matched
rvals = match.groups()
index = 0
start: int = 0
stop: int = 0
if stype[0]:
starts = rvals[index]
if stype[0] == 'date' and len(starts) == 8:
start = arrow.get(starts, 'YYYYMMDD').int_timestamp
elif len(starts) == 13:
start = int(starts) // 1000
else:
start = int(starts)
index += 1
if stype[1]:
stops = rvals[index]
if stype[1] == 'date' and len(stops) == 8:
stop = arrow.get(stops, 'YYYYMMDD').int_timestamp
elif len(stops) == 13:
stop = int(stops) // 1000
else:
stop = int(stops)
if start > stop > 0:
raise Exception('Start date is after stop date for timerange "%s"' % text)
return TimeRange(stype[0], stype[1], start, stop)
raise Exception('Incorrect syntax for timerange "%s"' % text)