Jan Novak
d24d20553a
Port scripts/infer_payments.py parse_czk_amount to Go as internal/domain/money.ParseCZK. Preserves the Czech-locale heuristic (comma = decimal sep; 2+ dots = thousand seps; single dot = decimal) and returns (float64, error) so callers can opt into Python's silent-zero contract via v, _ := money.ParseCZK(s). All expected values verified against live Python on 2026-05-06. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
50 lines
1.5 KiB
Go
50 lines
1.5 KiB
Go
// Package money ports Czech-locale currency parsing from scripts/infer_payments.py.
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package money
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import (
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"errors"
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"strconv"
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"strings"
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)
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// ErrInvalidAmount is returned by ParseCZK when the input cannot be parsed.
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var ErrInvalidAmount = errors.New("money: invalid CZK amount")
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// ParseCZK parses a Czech-locale amount string and returns the value in CZK
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// as a float64. Mirrors scripts/infer_payments.py parse_czk_amount:
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//
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// - empty input → (0, nil)
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// - "Kč"/"CZK" suffixes stripped (case-sensitive, like Python)
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// - comma present → comma is decimal sep, dots/spaces are thousand seps
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// ("1.500,00" → 1500.0)
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// - no comma, 2+ dots → all dots are thousand seps ("1.500.000" → 1500000.0)
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// - no comma, ≤1 dot → dot is decimal sep ("1.500" → 1.5)
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// - on parse failure → (0, ErrInvalidAmount); callers wanting Python's
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// silent-zero behaviour can discard the error: v, _ := ParseCZK(s)
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func ParseCZK(s string) (float64, error) {
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if s == "" {
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return 0, nil
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}
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s = strings.ReplaceAll(s, "Kč", "")
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s = strings.ReplaceAll(s, "CZK", "")
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s = strings.TrimSpace(s)
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if strings.ContainsRune(s, ',') {
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s = strings.ReplaceAll(s, ".", "")
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s = strings.ReplaceAll(s, " ", "")
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s = strings.ReplaceAll(s, ",", ".")
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} else if strings.Count(s, ".") > 1 {
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s = strings.ReplaceAll(s, ".", "")
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s = strings.ReplaceAll(s, " ", "")
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} else {
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s = strings.ReplaceAll(s, " ", "")
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}
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v, err := strconv.ParseFloat(s, 64)
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if err != nil {
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return 0, ErrInvalidAmount
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}
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return v, nil
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}
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