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template.go
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template.go
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package template
import (
"fmt"
"regexp"
"strings"
"time"
"github.com/grokify/simplego/reflect/reflectutil"
"github.com/grokify/simplego/time/timeutil"
"github.com/grokify/simplego/type/stringsutil"
)
// Execute takes a template string and an interface{}
// struct, substituting struct values for the variables.
// Field names can be nested.
func Execute(pattern string, item interface{}) string {
r := regexp.MustCompile(`{{(.*?)}}`)
m := r.FindAllStringSubmatch(pattern, -1)
if len(m) == 0 {
return pattern
}
fields := []FieldInfo{}
for _, mi := range m {
fields = append(fields, ParseFieldInfoString(mi[1])...)
}
return fmt.Sprintf(
r.ReplaceAllString(pattern, "%v"),
GetFieldsFormattedForce(item, fields)...)
}
type FieldInfo struct {
Name string // . separated name path
Type string // . separated type path
Options []string
}
func ParseFieldInfoString(fieldsRawStr string) []FieldInfo {
fields := []FieldInfo{}
fieldsRaw := strings.Split(fieldsRawStr, ";")
for _, fieldStr := range fieldsRaw {
f := FieldInfo{}
fieldSections := strings.Split(fieldStr, "|")
if len(fieldSections) > 2 {
opts := strings.Split(fieldSections[2], ",")
if len(opts) > 0 {
f.Options = opts
}
}
if len(fieldSections) > 1 {
f.Type = strings.ToLower(strings.TrimSpace(fieldSections[1]))
}
if len(fieldSections) > 0 {
f.Name = fieldSections[0]
fields = append(fields, f)
}
}
return fields
}
func GetFieldFormatted(item interface{}, f FieldInfo) (interface{}, error) {
val, err := reflectutil.GetField(item, strings.Split(strings.TrimSpace(f.Name), ".")...)
if err != nil {
return val, err
}
typePath := strings.Split(strings.TrimSpace(f.Type), ".")
if len(typePath) > 0 {
switch strings.TrimSpace(typePath[0]) {
case "string":
return stringsutil.FormatString(val.(string), f.Options), nil
case "time":
dt := val.(time.Time)
format := time.RFC3339
if len(f.Options) > 0 {
formatTry := f.Options[0]
formatFound, err := timeutil.GetFormat(formatTry)
if err != nil {
return val, err
}
format = formatFound
}
return dt.Format(format), nil
}
}
return val, nil
}
// GetFieldsFormatted returns an interface{} slice for the struct and fields
// requested. An error is returned if any fields are not found or parsing options
// fail.
func GetFieldsFormatted(item interface{}, fs []FieldInfo) ([]interface{}, error) {
vals := []interface{}{}
for _, f := range fs {
val, err := GetFieldFormatted(item, f)
if err != nil {
return vals, err
}
vals = append(vals, val)
}
return vals, nil
}
// GetFieldsFormattedForce returns an interface{} slice for the struct and
// fields requested. An empty string value is returned for anything that
// encounters an error.
func GetFieldsFormattedForce(item interface{}, fs []FieldInfo) []interface{} {
vals := []interface{}{}
for _, f := range fs {
val, err := GetFieldFormatted(item, f)
if err != nil {
vals = append(vals, "")
}
vals = append(vals, val)
}
return vals
}