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package script
import (
"go/ast"
)
// for statement
type forStmt struct {
init, cond, post, body Expr
void
}
func (b *forStmt) Eval() interface{} {
for b.init.Eval(); b.cond.Eval().(bool); b.post.Eval() {
b.body.Eval()
}
return nil // void
}
func (w *World) compileForStmt(n *ast.ForStmt) *forStmt {
w.EnterScope()
defer w.ExitScope()
stmt := &forStmt{init: &nop{}, cond: &nop{}, post: &nop{}, body: &nop{}}
if n.Init != nil {
stmt.init = w.compileStmt(n.Init)
}
if n.Cond != nil {
stmt.cond = typeConv(n.Cond.Pos(), w.compileExpr(n.Cond), bool_t)
} else {
stmt.cond = boolLit(true)
}
if n.Post != nil {
stmt.post = w.compileStmt(n.Post)
}
if n.Body != nil {
stmt.body = w.compileBlockStmt_noScope(n.Body)
}
return stmt
}
type nop struct{ void }
func (e *nop) Child() []Expr { return nil }
func (e *nop) Eval() interface{} { return nil }
func (e *nop) Fix() Expr { return e }
func (e *forStmt) Child() []Expr {
return []Expr{e.init, e.cond, e.post, e.body}
}
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