Zero-dependency civil-date / RFC3339 timestamp parsing shared by the accounting transcript parser and the MCP LCM session handlers. This is the stricter of the two parsers it consolidates: it requires an explicit timezone (`Z` or `±HH:MM`), validates calendar ranges (month/day/leap years) and rejects trailing garbage, while still supporting fractional seconds (which are truncated). Parses a timez
(value: &str)
| 12 | /// Returns `None` for missing/invalid timezone suffixes, out-of-range |
| 13 | /// calendar or clock fields, or timestamps before the epoch. |
| 14 | pub fn parse_rfc3339_timestamp(value: &str) -> Option<i64> { |
| 15 | let bytes = value.as_bytes(); |
| 16 | if bytes.len() < 20 |
| 17 | || bytes.get(4) != Some(&b'-') |
| 18 | || bytes.get(7) != Some(&b'-') |
| 19 | || !matches!(bytes.get(10), Some(b'T' | b't' | b' ')) |
| 20 | || bytes.get(13) != Some(&b':') |
| 21 | || bytes.get(16) != Some(&b':') |
| 22 | { |
| 23 | return None; |
| 24 | } |
| 25 | |
| 26 | let year = parse_fixed_i32(value, 0, 4)?; |
| 27 | let month = parse_fixed_u32(value, 5, 7)?; |
| 28 | let day = parse_fixed_u32(value, 8, 10)?; |
| 29 | let hour = parse_fixed_u32(value, 11, 13)?; |
| 30 | let minute = parse_fixed_u32(value, 14, 16)?; |
| 31 | let second = parse_fixed_u32(value, 17, 19)?; |
| 32 | if !(1..=12).contains(&month) |
| 33 | || hour > 23 |
| 34 | || minute > 59 |
| 35 | || second > 59 |
| 36 | || day == 0 |
| 37 | || day > days_in_month(year, month) |
| 38 | { |
| 39 | return None; |
| 40 | } |
| 41 | |
| 42 | let mut zone_pos = 19; |
| 43 | if bytes.get(zone_pos) == Some(&b'.') { |
| 44 | zone_pos += 1; |
| 45 | let fraction_start = zone_pos; |
| 46 | while matches!(bytes.get(zone_pos), Some(b'0'..=b'9')) { |
| 47 | zone_pos += 1; |
| 48 | } |
| 49 | if zone_pos == fraction_start { |
| 50 | return None; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | let offset_seconds = match bytes.get(zone_pos)? { |
| 55 | b'Z' | b'z' => { |
| 56 | if zone_pos + 1 != bytes.len() { |
| 57 | return None; |
| 58 | } |
| 59 | 0 |
| 60 | } |
| 61 | b'+' | b'-' => { |
| 62 | if zone_pos + 6 != bytes.len() || bytes.get(zone_pos + 3) != Some(&b':') { |
| 63 | return None; |
| 64 | } |
| 65 | let offset_hours = parse_fixed_i32(value, zone_pos + 1, zone_pos + 3)?; |
| 66 | let offset_minutes = parse_fixed_i32(value, zone_pos + 4, zone_pos + 6)?; |
| 67 | if offset_hours > 23 || offset_minutes > 59 { |
| 68 | return None; |
| 69 | } |
| 70 | let offset = offset_hours * 3600 + offset_minutes * 60; |
| 71 | if bytes[zone_pos] == b'+' { |
no test coverage detected