mirror of
https://github.com/42wim/matterbridge.git
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59 lines
1.3 KiB
Go
59 lines
1.3 KiB
Go
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package common
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import (
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"text/scanner"
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"github.com/graph-gophers/graphql-go/types"
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)
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func ParseLiteral(l *Lexer, constOnly bool) types.Value {
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loc := l.Location()
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switch l.Peek() {
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case '$':
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if constOnly {
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l.SyntaxError("variable not allowed")
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panic("unreachable")
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}
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l.ConsumeToken('$')
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return &types.Variable{Name: l.ConsumeIdent(), Loc: loc}
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case scanner.Int, scanner.Float, scanner.String, scanner.Ident:
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lit := l.ConsumeLiteral()
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if lit.Type == scanner.Ident && lit.Text == "null" {
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return &types.NullValue{Loc: loc}
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}
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lit.Loc = loc
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return lit
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case '-':
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l.ConsumeToken('-')
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lit := l.ConsumeLiteral()
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lit.Text = "-" + lit.Text
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lit.Loc = loc
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return lit
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case '[':
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l.ConsumeToken('[')
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var list []types.Value
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for l.Peek() != ']' {
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list = append(list, ParseLiteral(l, constOnly))
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}
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l.ConsumeToken(']')
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return &types.ListValue{Values: list, Loc: loc}
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case '{':
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l.ConsumeToken('{')
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var fields []*types.ObjectField
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for l.Peek() != '}' {
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name := l.ConsumeIdentWithLoc()
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l.ConsumeToken(':')
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value := ParseLiteral(l, constOnly)
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fields = append(fields, &types.ObjectField{Name: name, Value: value})
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}
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l.ConsumeToken('}')
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return &types.ObjectValue{Fields: fields, Loc: loc}
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default:
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l.SyntaxError("invalid value")
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panic("unreachable")
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}
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}
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