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context.go
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context.go
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package vars
import (
"errors"
"reflect"
"strconv"
"strings"
"qiniupkg.com/dyn/dyn.v1"
"qiniupkg.com/dyn/text.v1"
"qiniupkg.com/x/log.v7"
. "qiniupkg.com/dyn/proto.v1"
)
const (
Fmttype_Invalid = -1
Fmttype_Json = text.Fmttype_Json
Fmttype_Form = text.Fmttype_Form
Fmttype_Text = text.Fmttype_Text
Fmttype_Jsonstr = text.Fmttype_Jsonstr // 在json的字符串内
)
var (
ErrNotVar = errors.New("assign to a non variable expression")
ErrUnmatchedValue = errors.New("unmatched value")
ErrSliceLenNotEqual = errors.New("slice length not equal")
)
// ---------------------------------------------------------------------------
type Context struct {
vars map[string]interface{}
}
func New() *Context {
vars := make(map[string]interface{})
return &Context{
vars: vars,
}
}
// ---------------------------------------------------------------------------
func (p *Context) GetVars() map[string]interface{} {
return p.vars
}
func (p *Context) GetVar(key string) (v interface{}, ok bool) {
return dyn.Get(p.vars, key)
}
func (p *Context) DeleteVar(key string) {
v := p.vars
parts := strings.Split(key, ".")
ilast := len(parts) - 1
for i := 0; i < ilast; i++ {
v1, ok1 := v[parts[i]]
if !ok1 {
return
}
v2, ok2 := v1.(map[string]interface{})
if !ok2 || v2 == nil {
return
}
v = v2
}
delete(v, parts[ilast])
}
func (p *Context) MatchVar(key string, vreal interface{}) (err error) {
var v interface{}
var ok bool
parts := strings.Split(key, ".")
ilast := len(parts) - 1
v = p.vars
for i, part := range parts {
v1, ok1 := v.(map[string]interface{})
if !ok1 || v1 == nil {
return ErrUnmatchedValue
}
if v, ok = v1[part]; ok {
continue
}
if i == ilast {
v1[part] = vreal
return nil
}
v = make(map[string]interface{})
v1[part] = v
}
return p.Match(v, vreal)
}
// ---------------------------------------------------------------------------
func (p *Context) Match(vexp, vreal interface{}) (err error) {
return p.doMatch(vexp, vreal, "")
}
func (p *Context) doMatch(vexp, vreal interface{}, field string) (err error) {
switch v := vexp.(type) {
case map[string]interface{}:
if v2, ok := vreal.(map[string]interface{}); ok {
sfield := field
if sfield != "" {
sfield += "."
}
for sk, sv := range v {
if sv2, ok2 := v2[sk]; ok2 {
err = p.doMatch(sv, sv2, sfield + sk)
if err == nil {
continue
}
} else {
err = errors.New("field not found: `" + sfield + sk + "`")
}
return
}
return nil
}
log.Debug("Match map object failed:", vexp, vreal)
case Var:
err2 := p.MatchVar(v.Key, vreal)
if err2 != nil {
if field == "" {
return ErrUnmatchedValue
}
return errors.New("match field `" + field + "` failed: " + err2.Error())
}
return nil
case []interface{}:
v2 := reflect.ValueOf(vreal)
if v2.Kind() == reflect.Slice {
if len(v) != v2.Len() {
err = ErrSliceLenNotEqual
return
}
sfield := field
if sfield != "" {
sfield += "."
}
for i, sv := range v {
err = p.doMatch(sv, v2.Index(i).Interface(), sfield + strconv.Itoa(i))
if err != nil {
return
}
}
return nil
}
log.Debug("Match slice object failed:", vexp, vreal)
default:
if reflect.DeepEqual(vexp, vreal) {
return nil
}
log.Debug("Match value failed:", vexp, vreal)
}
if field == "" {
return ErrUnmatchedValue
}
return errors.New("unmatched field: `" + field + "`")
}
// ---------------------------------------------------------------------------
func (p *Context) Let(vexp, vreal interface{}) (err error) {
if v, ok := vexp.(Var); ok {
p.DeleteVar(v.Key)
return p.Match(vexp, vreal)
}
return ErrNotVar
}
// ---------------------------------------------------------------------------
func (p *Context) Subst(vexp interface{}, ft int) (vres interface{}, err error) {
switch v := vexp.(type) {
case map[string]interface{}:
vres1 := make(map[string]interface{})
for sk, sv := range v {
vres2, err2 := p.Subst(sv, Fmttype_Invalid)
if err2 != nil {
return nil, err2
}
vres1[sk] = vres2
}
return vres1, nil
case string:
if ft == Fmttype_Invalid {
return vexp, nil
}
vres, err = p.SubstText(v, ft)
return
case Var:
vres1, ok1 := dyn.Get(p.vars, v.Key)
if !ok1 {
return nil, errors.New("var `" + v.Key + "` not found")
}
return vres1, nil
case []interface{}:
n := len(v)
vres1 := make([]interface{}, n)
for i, sv := range v {
vres2, err2 := p.Subst(sv, Fmttype_Invalid)
if err2 != nil {
return nil, err2
}
vres1[i] = vres2
}
return vres1, nil
default:
return vexp, nil
}
}
func (p *Context) SubstText(exprvar string, ft int) (v string, err error) {
return text.Subst(exprvar, p.vars, ft, true)
}
// ---------------------------------------------------------------------------