init push

internal/shared/pkg/nextdue/parser.go

@@ -0,0 +1,82 @@
+package nextdue
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+	"time"
+)
+
+type ValueKind string
+
+const (
+	ValueKindUnknown ValueKind = ""
+	ValueKindHours   ValueKind = "hours"
+	ValueKindDate    ValueKind = "date"
+)
+
+type Value struct {
+	Kind  ValueKind
+	Raw   string
+	Hours *float64
+	Date  *time.Time
+}
+
+type ParseError struct {
+	Field string
+	Raw   string
+	Msg   string
+}
+
+func (e *ParseError) Error() string {
+	if e == nil {
+		return ""
+	}
+	if strings.TrimSpace(e.Field) == "" {
+		return e.Msg
+	}
+	return fmt.Sprintf("%s: %s", e.Field, e.Msg)
+}
+
+type Parser struct {
+	DateLayout string
+}
+
+func NewParser() Parser { return Parser{DateLayout: "2006-01-02"} }
+
+func (p Parser) Parse(field, raw string) (Value, error) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return Value{Kind: ValueKindUnknown, Raw: ""}, nil
+	}
+	if d, err := time.Parse(p.dateLayout(), raw); err == nil {
+		dd := d.UTC()
+		return Value{Kind: ValueKindDate, Raw: raw, Date: &dd}, nil
+	}
+	if h, err := strconv.ParseFloat(raw, 64); err == nil {
+		return Value{Kind: ValueKindHours, Raw: raw, Hours: &h}, nil
+	}
+	return Value{}, &ParseError{Field: field, Raw: raw, Msg: "must be either an ISO date (YYYY-MM-DD) or a numeric hour value"}
+}
+
+func IsUnset(v Value) bool {
+	switch v.Kind {
+	case ValueKindHours:
+		return v.Hours == nil || *v.Hours <= 0
+	case ValueKindDate:
+		return v.Date == nil || v.Date.IsZero()
+	default:
+		return true
+	}
+}
+
+func (p Parser) dateLayout() string {
+	if strings.TrimSpace(p.DateLayout) == "" {
+		return "2006-01-02"
+	}
+	return p.DateLayout
+}
+
+func NormalizeDate(t time.Time) time.Time {
+	return time.Date(t.UTC().Year(), t.UTC().Month(), t.UTC().Day(), 0, 0, 0, 0, time.UTC)
+}