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util.go
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util.go
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package normalizer
import (
"strings"
"gopkg.in/bblfsh/sdk.v2/uast/nodes"
. "gopkg.in/bblfsh/sdk.v2/uast/transformer"
)
func num2dots(n nodes.Value, prefix string) nodes.Value {
if intval, ok := n.(nodes.Int); ok {
i64val := int(intval)
return nodes.String(strings.Repeat(prefix, int(i64val)))
}
return n
}
// FIXME: not reversible
type OpPrependPath struct {
numLevel Op
path Op
joined Op
prefix string
}
func (op OpPrependPath) Kinds() nodes.Kind {
return nodes.KindString
}
func (op OpPrependPath) Check(st *State, n nodes.Node) (bool, error) {
v, ok := n.(nodes.Value)
if !ok {
return false, nil
}
res1, err := op.numLevel.Check(st, n)
if err != nil || !res1 {
return false, err
}
res2, err := op.path.Check(st, v)
if err != nil || !res2 {
return false, err
}
return res1 && res2, nil
}
func (op OpPrependPath) Construct(st *State, n nodes.Node) (nodes.Node, error) {
first, err := op.numLevel.Construct(st, n)
if err != nil || first == nil {
return n, err
}
firstVal := first.(nodes.Value)
prependVal := num2dots(firstVal, op.prefix)
path, err := op.path.Construct(st, n)
if err != nil || path == nil {
return n, err
}
joined := string(prependVal.(nodes.String)) + string(path.(nodes.String))
op.joined = String(joined)
v, err := op.joined.Construct(st, n)
if err != nil {
return nil, err
}
return v, nil
}
type OpLevelDotsNumConv struct {
op Op
orig Op
prefix string
}
func (op OpLevelDotsNumConv) Kinds() nodes.Kind {
return nodes.KindString | nodes.KindInt
}
func (op OpLevelDotsNumConv) Check(st *State, n nodes.Node) (bool, error) {
v, ok := n.(nodes.Value)
if !ok {
return false, nil
}
nv := num2dots(v, op.prefix)
res1, err := op.op.Check(st, nv)
if err != nil || !res1 {
return false, err
}
res2, err := op.orig.Check(st, v)
if err != nil || !res2 {
return false, err
}
return res1 && res2, nil
}
func (op OpLevelDotsNumConv) Construct(st *State, n nodes.Node) (nodes.Node, error) {
n, err := op.orig.Construct(st, n)
if err != nil {
return nil, err
}
v, ok := n.(nodes.Int)
if !ok {
return nil, ErrExpectedValue.New(n)
}
return v, nil
}
var _ Op = OpLevelDotsNumConv{}