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jq.go
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jq.go
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package middlewares
import (
"context"
"github.com/go-go-golems/glazed/pkg/types"
"github.com/itchyny/gojq"
"github.com/pkg/errors"
)
type JqObjectMiddleware struct {
expression string
query *gojq.Query
}
func NewJqObjectMiddleware(
expression string,
) (*JqObjectMiddleware, error) {
ret := &JqObjectMiddleware{
expression: expression,
}
if expression != "" {
query, err := gojq.Parse(expression)
if err != nil {
return nil, err
}
ret.query = query
}
return ret, nil
}
func (jqm *JqObjectMiddleware) Close(ctx context.Context) error {
return nil
}
func (jqm *JqObjectMiddleware) Process(
ctx context.Context,
object types.Row,
) ([]types.Row, error) {
ret := []types.Row{}
if jqm.query != nil {
// TODO(manuel, 2023-06-25) Transform to map before passing to jq
m := map[string]interface{}{}
for pair := object.Oldest(); pair != nil; pair = pair.Next() {
m[pair.Key] = pair.Value
}
iter := jqm.query.Run(m)
for {
v, ok := iter.Next()
if !ok {
break
}
switch v_ := v.(type) {
case error:
return nil, v_
case []interface{}:
for _, v := range v_ {
switch v_ := v.(type) {
case error:
return nil, v_
case map[string]interface{}:
ret = append(ret, types.NewRowFromMap(v_))
case types.Row:
ret = append(ret, v_)
default:
return nil, errors.Errorf("Expected object, got %T", v)
}
}
continue
case types.Row:
ret = append(ret, v_)
case map[string]interface{}:
ret = append(ret, types.NewRowFromMap(v_))
}
}
} else {
ret = append(ret, object)
}
return ret, nil
}
type JqTableMiddleware struct {
fieldExpressions map[types.FieldName]string
fieldQueries map[types.FieldName]*gojq.Query
}
func (jqm *JqTableMiddleware) Close(ctx context.Context) error {
return nil
}
func NewJqTableMiddleware(
fieldExpressions map[types.FieldName]string,
) (*JqTableMiddleware, error) {
ret := &JqTableMiddleware{
fieldExpressions: fieldExpressions,
fieldQueries: map[types.FieldName]*gojq.Query{},
}
for columnName, fieldExpression := range fieldExpressions {
query, err := gojq.Parse(fieldExpression)
if err != nil {
return nil, err
}
ret.fieldQueries[columnName] = query
}
return ret, nil
}
func (jqm *JqTableMiddleware) Process(ctx context.Context, table *types.Table) (*types.Table, error) {
ret := &types.Table{
Columns: []types.FieldName{},
Rows: []types.Row{},
}
ret.Columns = append(ret.Columns, table.Columns...)
for _, row := range table.Rows {
values := row
newRow := types.NewRow()
for pair := values.Oldest(); pair != nil; pair = pair.Next() {
rowField, value := pair.Key, pair.Value
query, ok := jqm.fieldQueries[rowField]
if !ok {
newRow.Set(rowField, value)
continue
}
// TODO(manuel, 2023-03-06) Support generating multiple rows out of jq field queries
//
// See https://github.com/go-go-golems/glazed/issues/203
//
// currently, we only support single value returning queries.
// in the future, we could image individual rows being "flattened"
// out into multiple rows, but that will come later
iter := query.Run(value)
v, ok := iter.Next()
if ok {
if err, ok := v.(error); ok {
return nil, err
}
newRow.Set(rowField, v)
}
}
ret.Rows = append(ret.Rows, newRow)
}
return ret, nil
}