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converters.go
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/
converters.go
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// Licensed to The Moov Authors under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. The Moov Authors licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package ach
import (
"math"
"strconv"
"strings"
"unicode/utf8"
)
// converters handles golang to ACH type Converters
type converters struct{}
func (c *converters) parseNumField(r string) (s int) {
s, _ = strconv.Atoi(strings.TrimSpace(r))
return s
}
func (c *converters) parseStringField(r string) (s string) {
s = strings.TrimSpace(r)
return s
}
func (c *converters) parseStringFieldWithOpts(r string, opts *ValidateOpts) string {
if opts != nil && opts.PreserveSpaces {
return r
} else {
return c.parseStringField(r)
}
}
// formatSimpleDate takes a YYMMDD date and formats it for the fixed-width ACH file format
func (c *converters) formatSimpleDate(s string) string {
if s == "" {
return c.stringField(s, 6)
}
return s
}
// formatSimpleTime takes a HHmm (H=hour, m=minute) time and formats it for the fixed-width ACH file format
func (c *converters) formatSimpleTime(s string) string {
if s == "" {
return c.stringField(s, 4)
}
return s
}
var (
spaceZeros map[int]string = populateMap(94, " ")
stringZeros map[int]string = populateMap(94, "0")
)
// populateMap will allocate strings for padding ACH fields.
//
// In Go strings are immutable so they can be reused across objects without needing to allocate new objects.
func populateMap(max int, zero string) map[int]string {
out := make(map[int]string, max)
for i := 0; i < max; i++ {
out[i] = strings.Repeat(zero, i)
}
return out
}
// alphaField Alphanumeric and Alphabetic fields are left-justified and space filled.
func (c *converters) alphaField(s string, max uint) string {
ln := uint(utf8.RuneCountInString(s))
if ln > max {
return s[:max]
}
m := int(max - ln)
pad, exists := spaceZeros[m]
if exists {
return s + pad
}
// slow path
return s + strings.Repeat(" ", int(max-ln))
}
// numericField right-justified, unsigned, and zero filled
func (c *converters) numericField(n int, max uint) string {
s := strconv.FormatInt(int64(n), 10)
if l := uint(len(s)); l > max {
return s[l-max:]
} else {
m := int(max - l)
pad, exists := stringZeros[m]
if exists {
return pad + s
}
// slow path
return strings.Repeat("0", m) + s
}
}
// stringField slices to max length and zero filled
func (c *converters) stringField(s string, max uint) string {
ln := uint(utf8.RuneCountInString(s))
if ln > max {
return s[:max]
}
// Pad with preallocated string
m := int(max - ln)
pad, exists := stringZeros[m]
if exists {
return pad + s
}
// slow path
return strings.Repeat("0", m) + s
}
// leastSignificantDigits returns the least significant digits of v limited by maxDigits.
func (c *converters) leastSignificantDigits(v int, maxDigits uint) int {
return v % int(math.Pow10(int(maxDigits)))
}