mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-29 23:30:04 +01:00
95 lines
1.9 KiB
Go
95 lines
1.9 KiB
Go
package fastjson
|
|
|
|
import (
|
|
"errors"
|
|
)
|
|
|
|
// Scanner scans a series of JSON values. Values may be delimited by whitespace.
|
|
//
|
|
// Scanner may parse JSON lines ( http://jsonlines.org/ ).
|
|
//
|
|
// Scanner may be re-used for subsequent parsing.
|
|
//
|
|
// Scanner cannot be used from concurrent goroutines.
|
|
//
|
|
// Use Parser for parsing only a single JSON value.
|
|
type Scanner struct {
|
|
// b contains a working copy of json value passed to Init.
|
|
b []byte
|
|
|
|
// s points to the next JSON value to parse.
|
|
s string
|
|
|
|
// err contains the last error.
|
|
err error
|
|
|
|
// v contains the last parsed JSON value.
|
|
v *Value
|
|
|
|
// c is used for caching JSON values.
|
|
c cache
|
|
}
|
|
|
|
// Init initializes sc with the given s.
|
|
//
|
|
// s may contain multiple JSON values, which may be delimited by whitespace.
|
|
func (sc *Scanner) Init(s string) {
|
|
sc.b = append(sc.b[:0], s...)
|
|
sc.s = b2s(sc.b)
|
|
sc.err = nil
|
|
sc.v = nil
|
|
}
|
|
|
|
// InitBytes initializes sc with the given b.
|
|
//
|
|
// b may contain multiple JSON values, which may be delimited by whitespace.
|
|
func (sc *Scanner) InitBytes(b []byte) {
|
|
sc.Init(b2s(b))
|
|
}
|
|
|
|
// Next parses the next JSON value from s passed to Init.
|
|
//
|
|
// Returns true on success. The parsed value is available via Value call.
|
|
//
|
|
// Returns false either on error or on the end of s.
|
|
// Call Error in order to determine the cause of the returned false.
|
|
func (sc *Scanner) Next() bool {
|
|
if sc.err != nil {
|
|
return false
|
|
}
|
|
|
|
sc.s = skipWS(sc.s)
|
|
if len(sc.s) == 0 {
|
|
sc.err = errEOF
|
|
return false
|
|
}
|
|
|
|
sc.c.reset()
|
|
v, tail, err := parseValue(sc.s, &sc.c, 0)
|
|
if err != nil {
|
|
sc.err = err
|
|
return false
|
|
}
|
|
|
|
sc.s = tail
|
|
sc.v = v
|
|
return true
|
|
}
|
|
|
|
// Error returns the last error.
|
|
func (sc *Scanner) Error() error {
|
|
if sc.err == errEOF {
|
|
return nil
|
|
}
|
|
return sc.err
|
|
}
|
|
|
|
// Value returns the last parsed value.
|
|
//
|
|
// The value is valid until the Next call.
|
|
func (sc *Scanner) Value() *Value {
|
|
return sc.v
|
|
}
|
|
|
|
var errEOF = errors.New("end of s")
|