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ast_router.go
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ast_router.go
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package ast
import (
"bytes"
"fmt"
"go/ast"
"go/parser"
"go/printer"
"go/token"
"os"
"strings"
)
func AppendNodeToList(stmts []ast.Stmt, stmt ast.Stmt, index int) []ast.Stmt {
return append(stmts[:index], append([]ast.Stmt{stmt}, stmts[index:]...)...)
}
func AddRouterCode(path, funcName, pk, model string) {
src, err := os.ReadFile(path)
if err != nil {
fmt.Println(err)
}
fileSet := token.NewFileSet()
astFile, err := parser.ParseFile(fileSet, "", src, parser.ParseComments)
if err != nil {
fmt.Println(err)
}
FuncNode := FindFunction(astFile, funcName)
pkName := strings.ToUpper(pk[:1]) + pk[1:]
routerName := fmt.Sprintf("%sRouter", pk)
modelName := fmt.Sprintf("Init%sRouter", model)
var bloctPre *ast.BlockStmt
for i := len(FuncNode.Body.List) - 1; i >= 0; i-- {
if block, ok := FuncNode.Body.List[i].(*ast.BlockStmt); ok {
bloctPre = block
}
}
ast.Print(fileSet, FuncNode)
if ok, b := needAppendRouter(FuncNode, pk); ok {
routerNode :=
&ast.BlockStmt{
List: []ast.Stmt{
&ast.AssignStmt{
Lhs: []ast.Expr{
&ast.Ident{Name: routerName},
},
Tok: token.DEFINE,
Rhs: []ast.Expr{
&ast.SelectorExpr{
X: &ast.SelectorExpr{
X: &ast.Ident{Name: "router"},
Sel: &ast.Ident{Name: "RouterGroupApp"},
},
Sel: &ast.Ident{Name: pkName},
},
},
},
},
}
FuncNode.Body.List = AppendNodeToList(FuncNode.Body.List, routerNode, len(FuncNode.Body.List)-2)
bloctPre = routerNode
} else {
bloctPre = b
}
if needAppendInit(FuncNode, routerName, modelName) {
bloctPre.List = append(bloctPre.List,
&ast.ExprStmt{
X: &ast.CallExpr{
Fun: &ast.SelectorExpr{
X: &ast.Ident{Name: routerName},
Sel: &ast.Ident{Name: modelName},
},
Args: []ast.Expr{
&ast.Ident{
Name: "PrivateGroup",
},
&ast.Ident{
Name: "PublicGroup",
},
},
},
})
}
var out []byte
bf := bytes.NewBuffer(out)
printer.Fprint(bf, fileSet, astFile)
os.WriteFile(path, bf.Bytes(), 0666)
}
func needAppendRouter(funcNode ast.Node, pk string) (bool, *ast.BlockStmt) {
flag := true
var block *ast.BlockStmt
ast.Inspect(funcNode, func(node ast.Node) bool {
switch n := node.(type) {
case *ast.BlockStmt:
for i := range n.List {
if assignNode, ok := n.List[i].(*ast.AssignStmt); ok {
if identNode, ok := assignNode.Lhs[0].(*ast.Ident); ok {
if identNode.Name == fmt.Sprintf("%sRouter", pk) {
flag = false
block = n
return false
}
}
}
}
}
return true
})
return flag, block
}
func needAppendInit(funcNode ast.Node, routerName string, modelName string) bool {
flag := true
ast.Inspect(funcNode, func(node ast.Node) bool {
switch n := funcNode.(type) {
case *ast.CallExpr:
if selectNode, ok := n.Fun.(*ast.SelectorExpr); ok {
x, xok := selectNode.X.(*ast.Ident)
if xok && x.Name == routerName && selectNode.Sel.Name == modelName {
flag = false
return false
}
}
}
return true
})
return flag
}