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https://github.com/cgrates/cgrates.git
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71 lines
2.1 KiB
Go
71 lines
2.1 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 utils
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import (
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"errors"
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"regexp"
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"strings"
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)
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func ParseSearchReplaceFromFieldRule(fieldRule string) (string, *ReSearchReplace, error) {
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// String rule expected in the form ~hdr_name:s/match_rule/replace_rule/
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getRuleRgxp := regexp.MustCompile(`~(\w+):s\/(.+[^\\])\/(.+[^\\])\/`) // Make sure the separator / is not escaped in the rule
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allMatches := getRuleRgxp.FindStringSubmatch(fieldRule)
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if len(allMatches) != 4 { // Second and third groups are of interest to us
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return "", nil, errors.New("Invalid Search&Replace field rule.")
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}
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fieldName := allMatches[1]
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searchRegexp, err := regexp.Compile(allMatches[2])
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if err != nil {
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return fieldName, nil, err
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}
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return fieldName, &ReSearchReplace{searchRegexp, allMatches[3]}, nil
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}
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func NewRSRField(fldStr string) (*RSRField, error) {
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if len(fldStr) == 0 {
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return nil, nil
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}
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if !strings.HasPrefix(fldStr, REGEXP_SEP) {
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return &RSRField{Id: fldStr}, nil
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}
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if fldId, reSrcRepl, err := ParseSearchReplaceFromFieldRule(fldStr); err != nil {
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return nil, err
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} else {
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return &RSRField{fldId, reSrcRepl}, nil
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}
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}
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type RSRField struct {
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Id string // Identifier
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RSRule *ReSearchReplace // Rule to use when processing field value
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}
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// Parse the field value from a string
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func (rsrf *RSRField) ParseValue(value string) string {
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if len(value) == 0 {
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return value
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}
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if rsrf.RSRule != nil {
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value = rsrf.RSRule.Process(value)
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}
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return value
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}
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