34 lines
703 B
Go
34 lines
703 B
Go
package optimizer
|
|
|
|
import (
|
|
. "github.com/antonmedv/expr/ast"
|
|
)
|
|
|
|
type constRange struct{}
|
|
|
|
func (*constRange) Enter(*Node) {}
|
|
func (*constRange) Exit(node *Node) {
|
|
switch n := (*node).(type) {
|
|
case *BinaryNode:
|
|
if n.Operator == ".." {
|
|
if min, ok := n.Left.(*IntegerNode); ok {
|
|
if max, ok := n.Right.(*IntegerNode); ok {
|
|
size := max.Value - min.Value + 1
|
|
// In this case array is too big. Skip generation,
|
|
// and wait for memory budget detection on runtime.
|
|
if size > 1e6 {
|
|
return
|
|
}
|
|
value := make([]int, size)
|
|
for i := range value {
|
|
value[i] = min.Value + i
|
|
}
|
|
Patch(node, &ConstantNode{
|
|
Value: value,
|
|
})
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|