mirror of https://github.com/databricks/cli.git
108 lines
3.2 KiB
Go
108 lines
3.2 KiB
Go
package jsonloader
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import (
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"bytes"
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"encoding/json"
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"fmt"
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"io"
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"github.com/databricks/cli/libs/dyn"
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)
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func LoadJSON(data []byte, source string) (dyn.Value, error) {
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offset := BuildLineOffsets(data)
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offset.SetSource(source)
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reader := bytes.NewReader(data)
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decoder := json.NewDecoder(reader)
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// Start decoding from the top-level value
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value, err := decodeValue(decoder, &offset)
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if err != nil {
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if err == io.EOF {
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err = fmt.Errorf("unexpected end of JSON input")
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}
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return dyn.InvalidValue, fmt.Errorf("error decoding JSON at %s: %v", value.Location(), err)
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}
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return value, nil
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}
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func decodeValue(decoder *json.Decoder, o *Offset) (dyn.Value, error) {
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// Read the next JSON token
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token, err := decoder.Token()
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if err != nil {
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return dyn.InvalidValue, err
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}
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// Get the current byte offset and the location.
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// We will later use this location to store the location of the value in the file
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// For objects and arrays, we will store the location of the opening '{' or '['
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// For primitive types, we will store the location of the value itself (end of the value)
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// We can't reliably calculate the beginning of the value for primitive types because
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// the decoder doesn't provide the offset of the beginning of the value and the value might or might not be quoted.
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offset := decoder.InputOffset()
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location := o.GetPosition(offset)
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switch tok := token.(type) {
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case json.Delim:
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if tok == '{' {
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location = o.GetPosition(offset - 1)
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// Decode JSON object
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obj := dyn.NewMapping()
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for decoder.More() {
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// Decode the key
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keyToken, err := decoder.Token()
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if err != nil {
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return invalidValueWithLocation(decoder, o), err
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}
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key, ok := keyToken.(string)
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if !ok {
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return invalidValueWithLocation(decoder, o), fmt.Errorf("expected string for object key")
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}
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// Get the offset of the key by subtracting the length of the key and the '"' character
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keyOffset := decoder.InputOffset() - int64(len(key)+1)
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keyVal := dyn.NewValue(key, []dyn.Location{o.GetPosition(keyOffset)})
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// Decode the value recursively
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val, err := decodeValue(decoder, o)
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if err != nil {
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return invalidValueWithLocation(decoder, o), err
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}
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obj.Set(keyVal, val)
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}
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// Consume the closing '}'
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if _, err := decoder.Token(); err != nil {
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return invalidValueWithLocation(decoder, o), err
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}
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return dyn.NewValue(obj, []dyn.Location{location}), nil
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} else if tok == '[' {
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location = o.GetPosition(offset - 1)
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// Decode JSON array
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var arr []dyn.Value
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for decoder.More() {
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val, err := decodeValue(decoder, o)
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if err != nil {
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return invalidValueWithLocation(decoder, o), err
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}
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arr = append(arr, val)
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}
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// Consume the closing ']'
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if _, err := decoder.Token(); err != nil {
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return invalidValueWithLocation(decoder, o), err
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}
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return dyn.NewValue(arr, []dyn.Location{location}), nil
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}
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default:
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return dyn.NewValue(tok, []dyn.Location{location}), nil
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}
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return invalidValueWithLocation(decoder, o), fmt.Errorf("unexpected token: %v", token)
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}
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func invalidValueWithLocation(decoder *json.Decoder, o *Offset) dyn.Value {
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location := o.GetPosition(decoder.InputOffset())
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return dyn.InvalidValue.WithLocations([]dyn.Location{location})
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}
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