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69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package stt
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import "fmt"
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// ReadNil reads a json object as nil and
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// returns whether it's a nil or not
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func (iter *Iterator) ReadNil() (ret bool) {
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c := iter.nextToken()
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if c == 'n' {
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iter.skipBytes('u', 'l', 'l') // null
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return true
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}
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iter.unreadByte()
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return false
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}
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// ReadBool reads t/true/f/false/1/0 as BoolValue
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func (iter *Iterator) ReadBool() (ret bool) {
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c := iter.nextToken()
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if c == 't' {
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iter.skipBytes('r', 'u', 'e')
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return true
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}
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if c == 'f' {
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iter.skipBytes('a', 'l', 's', 'e')
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return false
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}
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if c == '0' {
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return false
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}
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if c == '1' {
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return true
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}
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iter.ReportError("ReadBool", "expect t/true/1 or f/false/0, but found "+string([]byte{c}))
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return
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}
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// Skip skips an object and positions to relatively the next object
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func (iter *Iterator) Skip() {
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iter.skipString()
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}
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func (iter *Iterator) skipString() {
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if !iter.trySkipString() {
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iter.unreadByte()
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iter.ReadString()
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}
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}
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func (iter *Iterator) trySkipString() bool {
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for i := iter.head; i < iter.tail; i++ {
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c := iter.buf[i]
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if c == '/' {
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iter.head = i
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return true // valid
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}
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}
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return false
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}
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func (iter *Iterator) skipBytes(bytes ...byte) {
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for _, b := range bytes {
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if iter.readByte() != b {
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iter.ReportError("skipBytes", fmt.Sprintf("expect %s", string(bytes)))
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return
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}
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}
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}
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