php-parser/visitor/NsResolver.go

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// Package visitor contains walker.visitor implementations
package visitor
import (
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"strings"
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"github.com/z7zmey/php-parser/node"
"github.com/z7zmey/php-parser/node/name"
"github.com/z7zmey/php-parser/node/stmt"
"github.com/z7zmey/php-parser/walker"
)
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type Namespace struct {
Namespace string
Aliases map[string]map[string]string
}
func NewNamespace(NSName string) *Namespace {
return &Namespace{
Namespace: "",
Aliases: map[string]map[string]string{
"": {},
"const": {},
"function": {},
},
}
}
func (ns *Namespace) AddAlias(aliasType string, aliasName string, alias string) {
aliasType = strings.ToLower(aliasType)
if aliasType == "const" {
ns.Aliases[aliasType][alias] = aliasName
} else {
ns.Aliases[aliasType][strings.ToLower(alias)] = aliasName
}
}
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type NsResolver struct {
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Namespace *Namespace
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ResolvedNames map[node.Node]string
}
// NewNsResolver NsResolver type constructor
func NewNsResolver() *NsResolver {
return &NsResolver{
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Namespace: NewNamespace(""),
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ResolvedNames: map[node.Node]string{},
}
}
// EnterNode is invoked at every node in heirerchy
func (nsr *NsResolver) EnterNode(w walker.Walkable) bool {
switch n := w.(type) {
case *stmt.Namespace:
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if n.NamespaceName == nil {
nsr.Namespace = NewNamespace("")
} else {
NSParts := n.NamespaceName.(*name.Name).Parts
nsr.Namespace = NewNamespace(concatNameParts(NSParts))
}
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case *stmt.UseList:
useType := ""
if n.UseType != nil {
useType = n.UseType.(*node.Identifier).Value
}
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for _, nn := range n.Uses {
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nsr.AddAlias(useType, nn, nil)
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}
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// no reason to iterate into depth
return false
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case *stmt.GroupUse:
useType := ""
if n.UseType != nil {
useType = n.UseType.(*node.Identifier).Value
}
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for _, nn := range n.UseList {
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nsr.AddAlias(useType, nn, n.Prefix.(*name.Name).Parts)
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}
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// no reason to iterate into depth
return false
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}
return true
}
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func (nsr *NsResolver) AddAlias(useType string, nn node.Node, prefix []node.Node) {
switch use := nn.(type) {
case *stmt.Use:
if use.UseType != nil {
useType = use.UseType.(*node.Identifier).Value
}
useNameParts := use.Use.(*name.Name).Parts
var alias string
if use.Alias == nil {
alias = useNameParts[len(useNameParts)-1].(*name.NamePart).Value
} else {
alias = use.Alias.(*node.Identifier).Value
}
nsr.Namespace.AddAlias(useType, concatNameParts(prefix, useNameParts), alias)
}
}
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// GetChildrenVisitor is invoked at every node parameter that contains children nodes
func (nsr *NsResolver) GetChildrenVisitor(key string) walker.Visitor {
return nsr
}
// LeaveNode is invoked after node process
func (nsr *NsResolver) LeaveNode(w walker.Walkable) {
switch n := w.(type) {
case *stmt.Namespace:
if n.Stmts != nil {
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nsr.Namespace = NewNamespace("")
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}
}
}
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func concatNameParts(parts ...[]node.Node) string {
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str := ""
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for _, p := range parts {
for _, n := range p {
if str == "" {
str = n.(*name.NamePart).Value
} else {
str = str + "\\" + n.(*name.NamePart).Value
}
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}
}
return str
}