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Further fix for ISO8601 date parsing.

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Recognize versions of timestamps with 'T' as the date/time separator.
For example, compare:

    '2021-08-01 23:14:00-05:00'
    '2021-08-01T23:14:00-05:00'

This commit adds support for the second flavor (and it's variations).
This commit is contained in:
Jonathan Bernard 2021-08-01 23:14:18 -05:00
parent 2b78727356
commit d90372127b
2 changed files with 20 additions and 19 deletions
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2
fiber_orm.nimble
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@ -1,6 +1,6 @@
# Package
version = "0.3.2"
version = "0.3.3"
author = "Jonathan Bernard"
description = "Lightweight Postgres ORM for Nim."
license = "GPL-3.0"

37
src/fiber_orm/util.nim
View File

@ -67,37 +67,38 @@ proc parsePGDatetime*(val: string): DateTime =
const PG_TIMESTAMP_FORMATS = [
"yyyy-MM-dd HH:mm:ss",
"yyyy-MM-dd'T'HH:mm:ss",
"yyyy-MM-dd HH:mm:sszz",
"yyyy-MM-dd'T'HH:mm:sszz",
"yyyy-MM-dd HH:mm:ss'.'fff",
"yyyy-MM-dd HH:mm:ss'.'fffzz"
"yyyy-MM-dd'T'HH:mm:ss'.'fff",
"yyyy-MM-dd HH:mm:ss'.'fffzz",
"yyyy-MM-dd'T'HH:mm:ss'.'fffzz",
"yyyy-MM-dd HH:mm:ss'.'fffzzz",
"yyyy-MM-dd'T'HH:mm:ss'.'fffzzz",
]
let PG_PARTIAL_FORMAT_REGEX = re"(\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.)(\d{1,3})(\S+)?"
var errStr = ""
# Try to parse directly using known format strings.
for df in PG_TIMESTAMP_FORMATS:
try: return val.parse(df)
except: errStr &= "\n\t" & getCurrentExceptionMsg()
var correctedVal = val;
# PostgreSQL will truncate any trailing 0's in the millisecond value leading
# to values like `2020-01-01 16:42.3+00`. This cannot currently be parsed by
# the standard times format as it expects exactly three digits for
# millisecond values. So we have to detect this and pad out the millisecond
# value to 3 digits.
let PG_PARTIAL_FORMAT_REGEX = re"(\d{4}-\d{2}-\d{2}( |'T')\d{2}:\d{2}:\d{2}\.)(\d{1,2})(\S+)?"
let match = val.match(PG_PARTIAL_FORMAT_REGEX)
if match.isSome:
let c = match.get.captures
try:
if c.toSeq.len == 2:
let corrected = c[0] & alignLeft(c[1], 3, '0')
return corrected.parse(PG_TIMESTAMP_FORMATS[2])
else:
let corrected = c[0] & alignLeft(c[1], 3, '0') & c[2]
return corrected.parse(PG_TIMESTAMP_FORMATS[3])
except:
errStr &= "\n\t" & getCurrentExceptionMsg()
if c.toSeq.len == 2: correctedVal = c[0] & alignLeft(c[2], 3, '0')
else: correctedVal = c[0] & alignLeft(c[2], 3, '0') & c[3]
var errStr = ""
# Try to parse directly using known format strings.
for df in PG_TIMESTAMP_FORMATS:
try: return correctedVal.parse(df)
except: errStr &= "\n\t" & getCurrentExceptionMsg()
raise newException(ValueError, "Cannot parse PG date. Tried:" & errStr)