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value.go
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value.go
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package gotextfsm
import (
"fmt"
"reflect"
"regexp"
"strings"
)
const MAX_NAME_LENG = 48
type ON_RECORD_TYPE int
const (
SKIP_RECORD ON_RECORD_TYPE = iota
SKIP_VALUE
CONTINUE
)
type TextFSMValue struct {
Regex string
Template string
Name string
Options []string
curval interface{}
filldown_value interface{}
}
func isValidOption(str string) bool {
switch str {
case "Required", "Key", "List", "Filldown", "Fillup":
return true
}
return false
}
func (value *TextFSMValue) Parse(input string, line_num int) error {
tokens := strings.Fields(input)
if len(tokens) < 3 {
return fmt.Errorf("%d Line: Expect at least 3 tokens on line.", line_num)
}
value.Options = make([]string, 0)
if !strings.HasPrefix(tokens[2], "(") {
// Format: Value Options Name Regular Expression
// ex: Value Filledown,Required interface (.*)
options := tokens[1]
for _, option := range strings.Split(options, ",") {
if !isValidOption(option) {
return fmt.Errorf("Line %d: Invalid option %s", line_num, option)
}
idx := FindIndex(value.Options, option)
if idx >= 0 {
return fmt.Errorf("%d Line: Duplicate option %s", line_num, option)
}
value.Options = append(value.Options, option)
}
value.Name = tokens[2]
value.Regex = strings.Join(tokens[3:], " ")
} else {
// Format: Value Name Regular Expression
// ex: Value interface (.*)
value.Name = tokens[1]
value.Regex = strings.Join(tokens[2:], " ")
}
if len(value.Name) > MAX_NAME_LENG {
return fmt.Errorf("%d Line: Invalid Value name '%s' or name too long.", line_num, value.Name)
}
square_brackets := regexp.MustCompile(`([^\\]?)\[[^]]*]`)
regex_without_brackets := square_brackets.ReplaceAllString(value.Regex, "$1")
if !regexp.MustCompile(`^\(.*\)$`).MatchString(value.Regex) {
return fmt.Errorf("%d Line: Value '%s' must be contained within a '()' pair.", line_num, value.Regex)
}
if strings.Count(regex_without_brackets, "(") != strings.Count(regex_without_brackets, ")") {
return fmt.Errorf("%d Line: Value '%s' must be contained within a '()' pair.", line_num, value.Regex)
}
if _, err := regexp.Compile(value.Regex); err != nil {
return fmt.Errorf("Line %d: Invalid regular expression '%s'. Error: '%s'", line_num, value.Regex, err.Error())
}
if _, err := GetGroupNames(value.Regex); err != nil {
return fmt.Errorf("Line %d: Invalid group names. Error: %s", line_num, err.Error())
}
value.Template = regexp.MustCompile(`^\(`).ReplaceAllString(value.Regex, fmt.Sprintf("(?P<%s>", value.Name))
return nil
}
// String() returns a string representation of the value
func (v *TextFSMValue) String() string {
var sb strings.Builder
sb.WriteString("Value ")
if v.Options != nil && len(v.Options) > 0 {
sb.WriteString(strings.Join(v.Options, ","))
sb.WriteString(" ")
}
sb.WriteString(fmt.Sprintf("%s %s", v.Name, v.Regex))
return sb.String()
}
func (v *TextFSMValue) processScalarValue(newval string) {
var finalval interface{} = nil
if FindIndex(v.Options, "List") >= 0 {
// If the value is 'List', add the new value to the current value.
if v.curval == nil {
if FindIndex(v.Options, "Filldown") >= 0 && v.filldown_value != nil {
// curval is null. But there is a filldown value. Append to filldown value
finalval = append(v.filldown_value.([]string), newval)
} else {
finalval = make([]string, 0)
finalval = append(finalval.([]string), newval)
}
} else {
finalval = append(v.curval.([]string), newval)
}
} else {
finalval = newval
}
if FindIndex(v.Options, "Filldown") >= 0 {
// If there is Filldown present, Remember the new value as filldown value
if finalval == nil {
finalval = v.filldown_value
} else {
v.filldown_value = finalval
}
}
v.curval = finalval
}
func (v *TextFSMValue) processMapValue(newval map[string]string) {
newmap := make(map[string]string)
var_names, err := GetGroupNames(v.Regex)
if err != nil {
panic(err)
}
for _, name := range var_names {
newmap[name] = newval[name]
}
var finalval interface{} = newmap
if FindIndex(v.Options, "List") >= 0 {
// If the value is 'List', add the new value to the current value.
if newval != nil && len(newval) > 0 {
if v.curval == nil {
if FindIndex(v.Options, "Filldown") >= 0 && v.filldown_value != nil {
// curval is null. But there is a filldown value. Append to filldown value
finalval = append(v.filldown_value.([]map[string]string), newmap)
} else {
finalval = make([]map[string]string, 0)
finalval = append(finalval.([]map[string]string), newmap)
}
} else {
finalval = append(v.curval.([]map[string]string), newmap)
}
}
}
if FindIndex(v.Options, "Filldown") >= 0 {
// If there is Filldown present, Remember the new value as filldown value
if finalval == nil {
finalval = v.filldown_value
} else {
v.filldown_value = finalval
}
}
v.curval = finalval
}
func (v *TextFSMValue) onAppendRecord() ON_RECORD_TYPE {
if FindIndex(v.Options, "Required") >= 0 {
if v.isEmptyValue(v.curval) {
if FindIndex(v.Options, "Filldown") >= 0 {
if v.isEmptyValue(v.filldown_value) {
return SKIP_RECORD
} else {
return CONTINUE
}
}
return SKIP_RECORD
}
}
return CONTINUE
}
func (v *TextFSMValue) clearValue(all bool) {
v.curval = nil
if all && FindIndex(v.Options, "Filldown") >= 0 {
v.filldown_value = nil
}
}
func (v *TextFSMValue) getFinalValue() interface{} {
if v.isEmptyValue(v.curval) && FindIndex(v.Options, "Filldown") >= 0 {
return v.getFinalValueInternal(v.filldown_value)
}
return v.getFinalValueInternal(v.curval)
}
func (v *TextFSMValue) getFinalValueInternal(val interface{}) interface{} {
if val == nil {
if idx := FindIndex(v.Options, "List"); idx >= 0 {
if strings.Contains(v.Regex, "(?P") {
// If the regex contains (?P
// ex: Value List ((?P<name>\w+)\s+(?P<age>\d+))
// This will be an array of maps.
return make([]map[string]string, 0)
}
// Else, it will be an array of strings
return make([]string, 0)
} else if strings.Contains(v.Regex, "(?P") {
return make(map[string]string)
} else {
return ""
}
}
return val
}
func (v *TextFSMValue) isEmptyValue(val interface{}) bool {
if val == nil {
return true
}
switch val.(type) {
case string:
return val.(string) == ""
case []string:
return len(val.([]string)) == 0
case map[string]string:
return len(val.(map[string]string)) == 0
case []map[string]string:
return len(val.([]map[string]string)) == 0
default:
panic(fmt.Sprintf("Unknown data type %v for %s", reflect.TypeOf(val), v.Name))
}
}