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astwalker.go
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astwalker.go
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package javascript
import (
"github.com/dop251/goja/ast"
"github.com/dop251/goja/parser"
"github.com/yaklang/yaklang/common/log"
)
var _ Visitor = (*walker)(nil)
type ASTWalkerResult struct {
StringLiteral []string
Int64Literal []int64
Float64Literal []float64
Identifies []string
BadSyntax []string
}
// ASTWalk 对传入的JS代码进行AST遍历,返回遍历后的结果(包含字面量,标识符,语法错误)和错误
// Example:
// ```
// code = `function add(a, b) { return a + b; }`
// res = javascript.ASTWalk(code)~
// dump(res)
// ```
func BasicJavaScriptASTWalker(code string) (*ASTWalkerResult, error) {
walker := NewJavaScriptWalker()
walker.code = code
results := &ASTWalkerResult{}
walker.OnStringLiteral = func(i string) {
results.StringLiteral = append(results.StringLiteral, i)
}
walker.OnInt64Literal = func(i int64) {
results.Int64Literal = append(results.Int64Literal, i)
}
walker.OnFloat64Literal = func(i float64) {
results.Float64Literal = append(results.Float64Literal, i)
}
walker.OnIdentifier = func(i string, n ast.Node) {
results.Identifies = append(results.Identifies, i)
}
walker.OnSyntaxError = func(i string, lastNode ast.Node) {
results.BadSyntax = append(results.BadSyntax, i)
}
astProgram, err := parser.ParseFile(nil, "", code, 0)
if err != nil {
return nil, err
}
Walk(walker, astProgram)
return results, nil
}
type walker struct {
code string
lastNode ast.Node
handlers []func(n ast.Node)
OnInt64Literal func(i int64)
OnFloat64Literal func(i float64)
OnStringLiteral func(i string)
OnIdentifier func(i string, lastNode ast.Node)
OnSyntaxError func(i string, lastNode ast.Node)
}
func (w *walker) init() {
if w.OnStringLiteral == nil {
w.OnStringLiteral = func(i string) {
}
}
if w.OnInt64Literal == nil {
w.OnInt64Literal = func(i int64) {
}
}
if w.OnFloat64Literal == nil {
w.OnFloat64Literal = func(i float64) {
}
}
if w.OnIdentifier == nil {
w.OnIdentifier = func(i string, N ast.Node) {
}
}
if w.OnSyntaxError == nil {
w.OnSyntaxError = func(i string, lastNode ast.Node) {
}
}
}
func NewJavaScriptWalker(handlers ...func(ast.Node)) *walker {
w := &walker{handlers: handlers}
w.init()
return w
}
func (w *walker) Enter(n ast.Node) Visitor {
defer func() {
w.lastNode = n
if err := recover(); err != nil {
log.Warnf("javascript ast walk error: %s", err)
}
}()
for _, handler := range w.handlers {
handler(n)
}
switch ret := n.(type) {
case *ast.BadStatement:
if ret.From < ret.To && (len(w.code)-1) >= int(ret.From) {
w.OnSyntaxError(w.code[ret.From:ret.To], ret)
}
case *ast.BadExpression:
if ret.From < ret.To && (len(w.code)-1) >= int(ret.From) {
if len(w.code) > int(ret.To) {
w.OnSyntaxError(w.code[ret.From:ret.To], ret)
} else {
w.OnSyntaxError(w.code[ret.From:], ret)
}
}
case *ast.StringLiteral:
w.OnStringLiteral(ret.Value.String())
case *ast.NumberLiteral:
switch number := ret.Value.(type) {
case float64:
w.OnFloat64Literal(number)
case int64:
w.OnInt64Literal(number)
default:
log.Errorf("cannot supported: %v", ret)
}
case *ast.Identifier:
if ret == nil {
return w
}
w.OnIdentifier(ret.Name.String(), w.lastNode)
}
return w
}
func (w *walker) Exit(n ast.Node) {
}