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statements.go
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statements.go
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package golang
import (
"fmt"
"github.com/worldiety/macro/pkg/wdl"
"go/ast"
"go/token"
"log/slog"
"strconv"
)
func convertStatement(stmt ast.Stmt) (wdl.Statement, error) {
switch stmt := stmt.(type) {
case *ast.BlockStmt:
return wdl.NewBlockStmt(func(block *wdl.BlockStmt) {
for _, s := range stmt.List {
ws, err := convertStatement(s)
if err != nil {
slog.Error("cannot convert statement", "err", err)
continue
}
block.Add(ws)
}
}), nil
case *ast.AssignStmt:
return wdl.NewAssignStmt(func(assignStmt *wdl.AssignStmt) {
for _, expr := range stmt.Lhs {
wlhs, err := convertExpression(expr)
if err != nil {
slog.Error("cannot convert assignment lhs node", "err", err)
continue
}
assignStmt.AddLhs(wlhs)
}
for _, expr := range stmt.Rhs {
wrhs, err := convertExpression(expr)
if err != nil {
slog.Error("cannot convert assignment rhs node", "err", err)
continue
}
assignStmt.AddRhs(wrhs)
}
}), nil
case *ast.IfStmt:
return wdl.NewIfStmt(func(ifStmt *wdl.IfStmt) {
wcond, err := convertExpression(stmt.Cond)
if err != nil {
slog.Error("cannot convert if condition", "err", err)
} else {
ifStmt.SetCond(wcond)
}
if stmt.Init != nil {
winit, err := convertStatement(stmt.Init)
if err != nil {
slog.Error("cannot convert init statement", "err", err)
} else {
ifStmt.SetInit(winit)
}
}
if stmt.Else != nil {
welse, err := convertStatement(stmt.Else)
if err != nil {
slog.Error("cannot convert else statement", "err", err)
} else {
ifStmt.SetElse(welse)
}
}
wbody, err := convertStatement(stmt.Body)
if err != nil {
slog.Error("cannot convert body statement", "err", err)
} else {
ifStmt.SetBody(wbody.(*wdl.BlockStmt))
}
}), nil
case *ast.ReturnStmt:
return wdl.NewReturnStmt(func(wstmt *wdl.ReturnStmt) {
for _, expr := range stmt.Results {
we, err := convertExpression(expr)
if err != nil {
slog.Error("cannot convert expression", "err", err)
continue
}
wstmt.AddResults(we)
}
}), nil
default:
return nil, fmt.Errorf("statement not supported: %T", stmt)
}
}
func convertExpression(expr ast.Expr) (wdl.Expr, error) {
switch expr := expr.(type) {
case *ast.BinaryExpr:
return wdl.NewBinaryExpr(func(bnExpr *wdl.BinaryExpr) {
wleft, err := convertExpression(expr.X)
if err != nil {
slog.Error("cannot convert binary left expression", "err", err)
}
bnExpr.SetLeft(wleft)
switch expr.Op {
case token.NEQ:
bnExpr.SetOperator(wdl.NEQ)
case token.EQL:
bnExpr.SetOperator(wdl.EQL)
default:
slog.Error("unknown binary expr operator", "op", expr.Op.String())
}
wright, err := convertExpression(expr.Y)
if err != nil {
slog.Error("cannot convert binary right expression", "err", err)
}
bnExpr.SetRight(wright)
}), nil
case *ast.CallExpr:
return wdl.NewCallExpr(func(call *wdl.CallExpr) {
wfun, err := convertExpression(expr.Fun)
if err != nil {
slog.Error("cannot convert function expression", "err", err)
} else {
call.SetFun(wfun)
}
for _, arg := range expr.Args {
warg, err := convertExpression(arg)
if err != nil {
slog.Error("cannot convert argument expression", "err", err)
continue
}
call.AddArgs(warg)
}
}), nil
case *ast.BasicLit:
switch expr.Kind {
case token.STRING:
return wdl.NewStrLit(func(lit *wdl.StrLit) {
str, err := strconv.Unquote(expr.Value)
if err != nil {
slog.Error("cannot unquote literal", "err", err)
} else {
lit.SetValue(str)
}
}), nil
default:
return nil, fmt.Errorf("unknown literal type: %s", expr.Kind.String())
}
case *ast.Ident:
return wdl.Identifier(expr.Name), nil
case *ast.SelectorExpr:
return wdl.NewSelectorExpr(func(sel *wdl.SelectorExpr) {
wx, err := convertExpression(expr.X)
if err != nil {
slog.Error("cannot convert x expression on selector", "err", err)
} else {
sel.SetX(wx)
}
sel.SetSel(wdl.Identifier(expr.Sel.Name))
}), nil
default:
return nil, fmt.Errorf("expr not supported: %T", expr)
}
}