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package filter
import (
"go/ast"
"go/token"
"go/types"
"github.com/gopherjs/gopherjs/compiler/astutil"
)
func Assign(stmt ast.Stmt, info *types.Info, pkg *types.Package) ast.Stmt {
if s, ok := stmt.(*ast.AssignStmt); ok && s.Tok != token.ASSIGN && s.Tok != token.DEFINE {
var op token.Token
switch s.Tok {
case token.ADD_ASSIGN:
op = token.ADD
case token.SUB_ASSIGN:
op = token.SUB
case token.MUL_ASSIGN:
op = token.MUL
case token.QUO_ASSIGN:
op = token.QUO
case token.REM_ASSIGN:
op = token.REM
case token.AND_ASSIGN:
op = token.AND
case token.OR_ASSIGN:
op = token.OR
case token.XOR_ASSIGN:
op = token.XOR
case token.SHL_ASSIGN:
op = token.SHL
case token.SHR_ASSIGN:
op = token.SHR
case token.AND_NOT_ASSIGN:
op = token.AND_NOT
default:
panic(s.Tok)
}
var list []ast.Stmt
var viaTmpVars func(expr ast.Expr, name string) ast.Expr
viaTmpVars = func(expr ast.Expr, name string) ast.Expr {
switch e := astutil.RemoveParens(expr).(type) {
case *ast.IndexExpr:
return astutil.SetType(info, info.TypeOf(e), &ast.IndexExpr{
X: viaTmpVars(e.X, "_slice"),
Index: viaTmpVars(e.Index, "_index"),
})
case *ast.SelectorExpr:
sel, ok := info.Selections[e]
if !ok {
// qualified identifier
return e
}
newSel := &ast.SelectorExpr{
X: viaTmpVars(e.X, "_struct"),
Sel: e.Sel,
}
info.Selections[newSel] = sel
return astutil.SetType(info, info.TypeOf(e), newSel)
case *ast.StarExpr:
return astutil.SetType(info, info.TypeOf(e), &ast.StarExpr{
X: viaTmpVars(e.X, "_ptr"),
})
case *ast.Ident, *ast.BasicLit:
return e
default:
tmpVar := astutil.NewIdent(name, info.TypeOf(e), info, pkg)
list = append(list, &ast.AssignStmt{
Lhs: []ast.Expr{tmpVar},
Tok: token.DEFINE,
Rhs: []ast.Expr{e},
})
return tmpVar
}
}
lhs := viaTmpVars(s.Lhs[0], "_val")
list = append(list, &ast.AssignStmt{
Lhs: []ast.Expr{lhs},
Tok: token.ASSIGN,
Rhs: []ast.Expr{
astutil.SetType(info, info.TypeOf(s.Lhs[0]), &ast.BinaryExpr{
X: lhs,
Op: op,
Y: astutil.SetType(info, info.TypeOf(s.Rhs[0]), &ast.ParenExpr{
X: s.Rhs[0],
}),
}),
},
})
return &ast.BlockStmt{
List: list,
}
}
return stmt
}
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