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package common
import (
"text/scanner"
"github.com/graph-gophers/graphql-go/types"
)
func ParseLiteral(l *Lexer, constOnly bool) types.Value {
loc := l.Location()
switch l.Peek() {
case '$':
if constOnly {
l.SyntaxError("variable not allowed")
panic("unreachable")
}
l.ConsumeToken('$')
return &types.Variable{Name: l.ConsumeIdent(), Loc: loc}
case scanner.Int, scanner.Float, scanner.String, scanner.Ident:
lit := l.ConsumeLiteral()
if lit.Type == scanner.Ident && lit.Text == "null" {
return &types.NullValue{Loc: loc}
}
lit.Loc = loc
return lit
case '-':
l.ConsumeToken('-')
lit := l.ConsumeLiteral()
lit.Text = "-" + lit.Text
lit.Loc = loc
return lit
case '[':
l.ConsumeToken('[')
var list []types.Value
for l.Peek() != ']' {
list = append(list, ParseLiteral(l, constOnly))
}
l.ConsumeToken(']')
return &types.ListValue{Values: list, Loc: loc}
case '{':
l.ConsumeToken('{')
var fields []*types.ObjectField
for l.Peek() != '}' {
name := l.ConsumeIdentWithLoc()
l.ConsumeToken(':')
value := ParseLiteral(l, constOnly)
fields = append(fields, &types.ObjectField{Name: name, Value: value})
}
l.ConsumeToken('}')
return &types.ObjectValue{Fields: fields, Loc: loc}
default:
l.SyntaxError("invalid value")
panic("unreachable")
}
}
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