103 lines
2.3 KiB
Go
103 lines
2.3 KiB
Go
package ast_test
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import (
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"fmt"
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"github.com/z7zmey/php-parser/pkg/ast"
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"github.com/z7zmey/php-parser/pkg/ast/traverser"
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"github.com/z7zmey/php-parser/pkg/ast/visitor"
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"os"
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"strings"
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)
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func ExampleStxTree() {
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stxTree := &ast.Root{
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Stmts: []ast.Vertex{
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&ast.Nullable{
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Expr: &ast.Parameter{
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Type: nil,
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Var: nil,
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DefaultValue: nil,
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},
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},
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&ast.Identifier{},
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&ast.ArgumentList{
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Arguments: []ast.Vertex{
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&ast.Argument{},
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&ast.Argument{
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Expr: &ast.ScalarDnumber{},
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},
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},
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},
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},
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}
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traverser.NewDFS(&testVisitor{}).Traverse(stxTree)
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//output:
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//=> *ast.Root
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//=> Stmts:
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//=> *ast.Nullable
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//=> Expr:
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//=> *ast.Parameter
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//=> *ast.Identifier
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//=> *ast.ArgumentList
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//=> Arguments:
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//=> *ast.Argument
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//=> *ast.Argument
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//=> Expr:
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//=> *ast.ScalarDnumber
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}
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type testVisitor struct {
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visitor.Null
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depth int
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}
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func (v *testVisitor) Enter(key string, _ bool) {
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v.depth++
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fmt.Fprint(os.Stdout, "=>", strings.Repeat(" ", v.depth), key, ":\n")
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}
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func (v *testVisitor) Leave(key string, _ bool) {
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v.depth--
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}
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func (v *testVisitor) EnterNode(n ast.Vertex) bool {
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v.depth++
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n.Accept(v)
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return true
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}
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func (v *testVisitor) LeaveNode(_ ast.Vertex) {
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v.depth--
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}
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func (v *testVisitor) Root(_ *ast.Root) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.Root")
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}
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func (v *testVisitor) Nullable(_ *ast.Nullable) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.Nullable")
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}
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func (v *testVisitor) Parameter(_ *ast.Parameter) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.Parameter")
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}
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func (v *testVisitor) Identifier(_ *ast.Identifier) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.Identifier")
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}
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func (v *testVisitor) ArgumentList(_ *ast.ArgumentList) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.ArgumentList")
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}
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func (v *testVisitor) Argument(_ *ast.Argument) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.Argument")
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}
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func (v *testVisitor) ScalarDnumber(_ *ast.ScalarDnumber) {
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fmt.Fprintln(os.Stdout, "=>", strings.Repeat(" ", v.depth-1), "*ast.ScalarDnumber")
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}
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