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option.go
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option.go
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package thrifter
// Represent a single option, e.g. a = "123"
type Option struct {
NodeCommonField
Name string
Value string
}
func NewOption(parent Node) *Option {
return &Option{
NodeCommonField: NodeCommonField{
Parent: parent,
},
}
}
func (r *Option) NodeType() string {
return "Option"
}
func (r *Option) NodeValue() interface{} {
return *r
}
func (r *Option) String() string {
return toString(r.StartToken, r.EndToken)
}
func (r *Option) parse(p *Parser) (err error) {
// can't use keyword as option name
identTok := p.nextIdent(false)
if identTok == nil || identTok.Type != T_IDENT {
return p.unexpected(identTok.Raw, "identifier")
}
r.StartToken = identTok
r.Name = identTok.Raw
r.EndToken = identTok
// if there is no = token
tok := p.nextNonWhitespace()
if tok.Type != T_EQUALS {
return
}
// find next string
nextRune := p.peekNonWhitespace()
if nextRune != singleQuoteRune && nextRune != quoteRune {
err = p.unexpected(tok.Value, "' or \"")
return
}
// if it's string
strTok, err := p.nextString()
if err != nil {
return err
}
r.Value = strTok.Raw
r.EndToken = strTok
// since Options are always gathered in a slice during parent node parsing, we not need to link each Option with these pointers
r.Next = nil
r.Prev = nil
return
}
func parseOptions(p *Parser, parent Node) (res []*Option, rightParenTok *Token, err error) {
res = []*Option{}
var currOption *Option
for {
ru := p.peekNonWhitespace()
if toToken(string(ru)) == T_RIGHTPAREN {
rightParenTok = p.next()
break
}
currOption = NewOption(parent)
err = currOption.parse(p)
if err != nil {
return
}
res = append(res, currOption)
ru = p.peekNonWhitespace()
if toToken(string(ru)) == T_COMMA {
p.next() // consume comma
}
}
return
}