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https://github.com/cgrates/cgrates.git
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74 lines
2.4 KiB
Go
74 lines
2.4 KiB
Go
/*
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Rating system designed to be used in VoIP Carriers World
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Copyright (C) 2013 ITsysCOM
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>
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*/
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package cdre
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import (
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"errors"
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"fmt"
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)
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// Used as generic function logic for various fields
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// Attributes
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// source - the base source
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// width - the field width
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// strip - if present it will specify the strip strategy, when missing strip will not be allowed
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// padding - if present it will specify the padding strategy to use, left, right, zeroleft, zeroright
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func FmtFieldWidth(source string, width int, strip, padding string, mandatory bool) (string, error) {
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if mandatory && len(source) == 0 {
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return "", errors.New("Empty source value")
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}
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if len(source) == width { // the source is exactly the maximum length
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return source, nil
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}
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if len(source) > width { //the source is bigger than allowed
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if len(strip) == 0 {
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return "", fmt.Errorf("Source %s is bigger than the width %d, no strip defied", source, width)
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}
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if strip == "right" {
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return source[:width], nil
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} else if strip == "xright" {
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return source[:width-1] + "x", nil // Suffix with x to mark prefix
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} else if strip == "left" {
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diffIndx := len(source) - width
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return source[diffIndx:], nil
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} else if strip == "xleft" { // Prefix one x to mark stripping
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diffIndx := len(source) - width
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return "x" + source[diffIndx+1:], nil
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}
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} else { //the source is smaller as the maximum allowed
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if len(padding) == 0 {
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return "", fmt.Errorf("Source %s is smaller than the width %d, no padding defined", source, width)
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}
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var paddingFmt string
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switch padding {
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case "right":
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paddingFmt = fmt.Sprintf("%%-%ds", width)
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case "left":
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paddingFmt = fmt.Sprintf("%%%ds", width)
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case "zeroleft":
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paddingFmt = fmt.Sprintf("%%0%ds", width)
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}
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if len(paddingFmt) != 0 {
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return fmt.Sprintf(paddingFmt, source), nil
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}
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}
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return source, nil
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}
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