Phase 1: Refactor DateParser structure

- Create DateParser struct with configurable base time and week start
- Add placeholder methods for new parsing features
- Implement time-of-day parsing foundation (splitDateTime, parseTimeOfDay)
- Maintain backward compatibility with existing ParseDate() function
- Update tests to use new DateParser API
- All 33 existing tests passing
This commit is contained in:
2026-01-05 09:54:58 +01:00
parent a68d701d14
commit b37e2dfc39
3 changed files with 256 additions and 19 deletions
+224 -17
View File
@@ -2,34 +2,199 @@ package engine
import (
"fmt"
"strconv"
"strings"
"time"
)
// ParseDate parses date strings with smart interpretation
// Supports: ISO dates, relative (tomorrow, today), weekdays (sun, monday)
func ParseDate(s string) (time.Time, error) {
s = strings.ToLower(strings.TrimSpace(s))
now := timeNow()
// DateParser handles all date/time/duration parsing with configurable options
type DateParser struct {
base time.Time
weekStart time.Weekday
}
// NewDateParser creates a new DateParser with the given base time and week start
func NewDateParser(base time.Time, weekStart time.Weekday) *DateParser {
return &DateParser{
base: base,
weekStart: weekStart,
}
}
// NewDefaultDateParser creates a DateParser with current time and Monday week start
func NewDefaultDateParser() *DateParser {
return &DateParser{
base: timeNow(),
weekStart: time.Monday,
}
}
// ParseDate is the main entry point for date parsing
// Handles: ISO dates, weekdays, month names, day+month, period boundaries, durations, time of day
func (p *DateParser) ParseDate(s string) (time.Time, error) {
s = strings.ToLower(strings.TrimSpace(s))
// Check for time of day component (e.g., "mon:15:35" or "21jan:0800")
if dateStr, timeStr, hasTime := p.splitDateTime(s); hasTime {
dateVal, err := p.parseDateOnly(dateStr)
if err != nil {
return time.Time{}, err
}
return p.parseTimeOfDay(dateVal, timeStr)
}
return p.parseDateOnly(s)
}
// parseDateOnly parses just the date component without time
func (p *DateParser) parseDateOnly(s string) (time.Time, error) {
// Try ISO format first
if t, err := time.Parse("2006-01-02", s); err == nil {
return t, nil
}
// Relative dates
switch s {
case "today":
return time.Date(now.Year(), now.Month(), now.Day(), 0, 0, 0, 0, now.Location()), nil
case "tomorrow":
tomorrow := now.AddDate(0, 0, 1)
return time.Date(tomorrow.Year(), tomorrow.Month(), tomorrow.Day(), 0, 0, 0, 0, tomorrow.Location()), nil
case "yesterday":
yesterday := now.AddDate(0, 0, -1)
return time.Date(yesterday.Year(), yesterday.Month(), yesterday.Day(), 0, 0, 0, 0, yesterday.Location()), nil
if t, ok := p.parseRelative(s); ok {
return t, nil
}
// Weekday names
if t, ok := p.parseWeekday(s); ok {
return t, nil
}
// Month names (jan, january, feb, etc.)
if t, ok := p.parseMonthName(s); ok {
return t, nil
}
// Day+month format (21jan, Jan21, etc.)
if t, ok := p.parseDayMonth(s); ok {
return t, nil
}
// Period boundaries (sod, eod, sow, eow, etc.)
if t, ok := p.parsePeriodBoundary(s); ok {
return t, nil
}
// Special keywords (later, someday)
if t, ok := p.parseSpecialKeyword(s); ok {
return t, nil
}
// Duration as date offset (2d, 3w, etc.)
if t, ok := p.parseDurationAsDate(s); ok {
return t, nil
}
return time.Time{}, fmt.Errorf("unable to parse date: %s", s)
}
// splitDateTime checks if the string contains a time component
// Returns dateStr, timeStr, hasTime
func (p *DateParser) splitDateTime(s string) (string, string, bool) {
// Look for time patterns: HH:MM or HHMM at the end
// Examples: "mon:15:35", "21jan:0800", "15:35" (just time)
parts := strings.Split(s, ":")
if len(parts) < 2 {
return s, "", false
}
// Check last part for time pattern (2-4 digits)
lastPart := parts[len(parts)-1]
if len(lastPart) == 2 || len(lastPart) == 4 {
// Could be minutes (HH:MM) or HHMM format
if _, err := strconv.Atoi(lastPart); err == nil {
// Last part is numeric, could be time
if len(parts) == 2 {
// Format: "15:35" (just time, no date)
return "", s, true
} else if len(parts) >= 3 {
// Format: "mon:15:35" or similar
secondLast := parts[len(parts)-2]
if _, err := strconv.Atoi(secondLast); err == nil {
// HH:MM format
dateStr := strings.Join(parts[:len(parts)-2], ":")
timeStr := secondLast + ":" + lastPart
return dateStr, timeStr, true
} else if len(lastPart) == 4 {
// HHMM format
dateStr := strings.Join(parts[:len(parts)-1], ":")
return dateStr, lastPart, true
}
}
}
}
return s, "", false
}
// parseTimeOfDay applies time to a date
func (p *DateParser) parseTimeOfDay(date time.Time, timeStr string) (time.Time, error) {
var hour, minute int
var err error
if strings.Contains(timeStr, ":") {
// HH:MM format
parts := strings.Split(timeStr, ":")
if len(parts) != 2 {
return time.Time{}, fmt.Errorf("invalid time format: %s", timeStr)
}
hour, err = strconv.Atoi(parts[0])
if err != nil {
return time.Time{}, fmt.Errorf("invalid hour: %s", parts[0])
}
minute, err = strconv.Atoi(parts[1])
if err != nil {
return time.Time{}, fmt.Errorf("invalid minute: %s", parts[1])
}
} else {
// HHMM format
if len(timeStr) != 4 {
return time.Time{}, fmt.Errorf("invalid time format: %s (expected HHMM)", timeStr)
}
hour, err = strconv.Atoi(timeStr[0:2])
if err != nil {
return time.Time{}, fmt.Errorf("invalid hour: %s", timeStr[0:2])
}
minute, err = strconv.Atoi(timeStr[2:4])
if err != nil {
return time.Time{}, fmt.Errorf("invalid minute: %s", timeStr[2:4])
}
}
// Validate ranges
if hour < 0 || hour > 23 {
return time.Time{}, fmt.Errorf("hour must be 0-23: %d", hour)
}
if minute < 0 || minute > 59 {
return time.Time{}, fmt.Errorf("minute must be 0-59: %d", minute)
}
return time.Date(date.Year(), date.Month(), date.Day(), hour, minute, 0, 0, date.Location()), nil
}
// parseRelative handles relative date keywords
func (p *DateParser) parseRelative(s string) (time.Time, bool) {
switch s {
case "now":
return p.base, true
case "today":
return time.Date(p.base.Year(), p.base.Month(), p.base.Day(), 0, 0, 0, 0, p.base.Location()), true
case "tomorrow":
tomorrow := p.base.AddDate(0, 0, 1)
return time.Date(tomorrow.Year(), tomorrow.Month(), tomorrow.Day(), 0, 0, 0, 0, tomorrow.Location()), true
case "yesterday":
yesterday := p.base.AddDate(0, 0, -1)
return time.Date(yesterday.Year(), yesterday.Month(), yesterday.Day(), 0, 0, 0, 0, yesterday.Location()), true
}
return time.Time{}, false
}
// parseWeekday handles weekday names (mon, monday, etc.)
func (p *DateParser) parseWeekday(s string) (time.Time, bool) {
weekdays := map[string]time.Weekday{
"sun": time.Sunday, "sunday": time.Sunday,
"mon": time.Monday, "monday": time.Monday,
@@ -41,16 +206,52 @@ func ParseDate(s string) (time.Time, error) {
}
if targetWeekday, ok := weekdays[s]; ok {
return nextWeekday(now, targetWeekday), nil
return p.nextWeekday(targetWeekday), true
}
return time.Time{}, false
}
return time.Time{}, fmt.Errorf("unable to parse date: %s", s)
// parseMonthName handles month names (jan, january, feb, february, etc.)
func (p *DateParser) parseMonthName(s string) (time.Time, bool) {
// Placeholder for Phase 2
return time.Time{}, false
}
// parseDayMonth handles day+month formats (21jan, Jan21, etc.)
func (p *DateParser) parseDayMonth(s string) (time.Time, bool) {
// Placeholder for Phase 2
return time.Time{}, false
}
// parsePeriodBoundary handles period boundary keywords (sod, eod, sow, eow, etc.)
func (p *DateParser) parsePeriodBoundary(s string) (time.Time, bool) {
// Placeholder for Phase 2
return time.Time{}, false
}
// parseSpecialKeyword handles special keywords (later, someday)
func (p *DateParser) parseSpecialKeyword(s string) (time.Time, bool) {
// Placeholder for Phase 2
return time.Time{}, false
}
// parseDurationAsDate handles duration as date offset (2d, 3w, etc.)
func (p *DateParser) parseDurationAsDate(s string) (time.Time, bool) {
// Placeholder for Phase 2
return time.Time{}, false
}
// ParseDuration parses duration strings (1d, 2w, 5min, etc.)
func (p *DateParser) ParseDuration(s string) (time.Duration, error) {
// Use existing ParseRecurrencePattern for now (will expand in Phase 2)
return ParseRecurrencePattern(s)
}
// nextWeekday returns the next occurrence of the target weekday
// Smart logic: if today is Thursday and target is Sunday, returns this Sunday
// If today is Sunday and target is Sunday, returns next Sunday
func nextWeekday(from time.Time, target time.Weekday) time.Time {
func (p *DateParser) nextWeekday(target time.Weekday) time.Time {
from := p.base
// Calculate days until target
daysUntil := int(target - from.Weekday())
@@ -61,3 +262,9 @@ func nextWeekday(from time.Time, target time.Weekday) time.Time {
next := from.AddDate(0, 0, daysUntil)
return time.Date(next.Year(), next.Month(), next.Day(), 0, 0, 0, 0, next.Location())
}
// ParseDate is the public API that uses default settings
func ParseDate(s string) (time.Time, error) {
parser := NewDefaultDateParser()
return parser.ParseDate(s)
}
+4 -2
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@@ -199,7 +199,8 @@ func TestParseDateWeekday(t *testing.T) {
func TestNextWeekday(t *testing.T) {
// Test case: Thursday -> next Sunday should be this Sunday
thursday := time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC) // Jan 1, 2026 is a Thursday
nextSun := nextWeekday(thursday, time.Sunday)
parser := NewDateParser(thursday, time.Monday)
nextSun := parser.nextWeekday(time.Sunday)
if nextSun.Weekday() != time.Sunday {
t.Error("Should return Sunday")
@@ -214,7 +215,8 @@ func TestNextWeekday(t *testing.T) {
// Test case: Sunday -> next Sunday should be 7 days later
sunday := time.Date(2026, 1, 4, 0, 0, 0, 0, time.UTC) // Jan 4, 2026 is a Sunday
nextSun2 := nextWeekday(sunday, time.Sunday)
parser2 := NewDateParser(sunday, time.Monday)
nextSun2 := parser2.nextWeekday(time.Sunday)
expectedDays = 7
actualDays = int(nextSun2.Sub(sunday).Hours() / 24)