eSlider
094e2cb9df
Store valid_from/valid_to on leafs and filter search by calendar day without overloading D16 source staleness; stack start/start-assistant wires brain + PicoClaw.
45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
package facts
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// Interval of truth for a fact leaf (D24 / OQ5). Not D16 source staleness.
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//
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// Empty valid_from and valid_to means "always" (legacy leafs). Empty asOf
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// means "do not filter". Dates compare as YYYY-MM-DD (lexicographic).
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// NormalizeDay keeps the calendar day from ISO-8601 or bare dates.
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func NormalizeDay(s string) string {
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s = trimSpace(s)
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if len(s) >= 10 && s[4] == '-' && s[7] == '-' {
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return s[:10]
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}
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return s
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}
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func trimSpace(s string) string {
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i, j := 0, len(s)
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for i < j && (s[i] == ' ' || s[i] == '\t' || s[i] == '\n' || s[i] == '\r') {
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i++
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}
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for j > i && (s[j-1] == ' ' || s[j-1] == '\t' || s[j-1] == '\n' || s[j-1] == '\r') {
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j--
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}
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return s[i:j]
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}
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// ActiveAt reports whether a fact with [validFrom, validTo] holds at asOf.
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// validTo empty = open-ended. Both ends inclusive.
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func ActiveAt(validFrom, validTo, asOf string) bool {
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asOf = NormalizeDay(asOf)
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if asOf == "" {
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return true
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}
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from := NormalizeDay(validFrom)
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to := NormalizeDay(validTo)
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if from != "" && asOf < from {
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return false
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}
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if to != "" && asOf > to {
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return false
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}
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return true
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}
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