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| package json
|
| import (
| "io"
|
| "github.com/v2fly/v2ray-core/v5/common/buf"
| )
|
| // State is the internal state of parser.
| type State byte
|
| const (
| StateContent State = iota
| StateEscape
| StateDoubleQuote
| StateDoubleQuoteEscape
| StateSingleQuote
| StateSingleQuoteEscape
| StateComment
| StateSlash
| StateMultilineComment
| StateMultilineCommentStar
| )
|
| // Reader is a reader for filtering comments.
| // It supports Java style single and multi line comment syntax, and Python style single line comment syntax.
| type Reader struct {
| io.Reader
|
| state State
| br *buf.BufferedReader
| }
|
| // Read implements io.Reader.Read(). Buffer must be at least 3 bytes.
| func (v *Reader) Read(b []byte) (int, error) {
| if v.br == nil {
| v.br = &buf.BufferedReader{Reader: buf.NewReader(v.Reader)}
| }
|
| p := b[:0]
| for len(p) < len(b)-2 {
| x, err := v.br.ReadByte()
| if err != nil {
| if len(p) == 0 {
| return 0, err
| }
| return len(p), nil
| }
| switch v.state {
| case StateContent:
| switch x {
| case '"':
| v.state = StateDoubleQuote
| p = append(p, x)
| case '\'':
| v.state = StateSingleQuote
| p = append(p, x)
| case '\\':
| v.state = StateEscape
| case '#':
| v.state = StateComment
| case '/':
| v.state = StateSlash
| default:
| p = append(p, x)
| }
| case StateEscape:
| p = append(p, '\\', x)
| v.state = StateContent
| case StateDoubleQuote:
| switch x {
| case '"':
| v.state = StateContent
| p = append(p, x)
| case '\\':
| v.state = StateDoubleQuoteEscape
| default:
| p = append(p, x)
| }
| case StateDoubleQuoteEscape:
| p = append(p, '\\', x)
| v.state = StateDoubleQuote
| case StateSingleQuote:
| switch x {
| case '\'':
| v.state = StateContent
| p = append(p, x)
| case '\\':
| v.state = StateSingleQuoteEscape
| default:
| p = append(p, x)
| }
| case StateSingleQuoteEscape:
| p = append(p, '\\', x)
| v.state = StateSingleQuote
| case StateComment:
| if x == '\n' {
| v.state = StateContent
| p = append(p, '\n')
| }
| case StateSlash:
| switch x {
| case '/':
| v.state = StateComment
| case '*':
| v.state = StateMultilineComment
| default:
| p = append(p, '/', x)
| }
| case StateMultilineComment:
| switch x {
| case '*':
| v.state = StateMultilineCommentStar
| case '\n':
| p = append(p, '\n')
| }
| case StateMultilineCommentStar:
| switch x {
| case '/':
| v.state = StateContent
| case '*':
| // Stay
| case '\n':
| p = append(p, '\n')
| default:
| v.state = StateMultilineComment
| }
| default:
| panic("Unknown state.")
| }
| }
| return len(p), nil
| }
|
|
