40 lines
967 B
Go
40 lines
967 B
Go
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package parser
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import (
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"github.com/a-h/parse"
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)
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var stringExpression = parse.Func(func(pi *parse.Input) (n Node, ok bool, err error) {
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// Check the prefix first.
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if _, ok, err = parse.Or(parse.String("{ "), parse.String("{")).Parse(pi); err != nil || !ok {
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return
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}
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// Once we have a prefix, we must have an expression that returns a string, with optional err.
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var r StringExpression
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if r.Expression, err = parseGoSliceArgs(pi); err != nil {
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return r, false, err
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}
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// Clear any optional whitespace.
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_, _, _ = parse.OptionalWhitespace.Parse(pi)
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// }
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if _, ok, err = closeBraceWithOptionalPadding.Parse(pi); err != nil || !ok {
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err = parse.Error("string expression: missing close brace", pi.Position())
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return
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}
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// Parse trailing whitespace.
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ws, _, err := parse.Whitespace.Parse(pi)
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if err != nil {
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return r, false, err
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}
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r.TrailingSpace, err = NewTrailingSpace(ws)
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if err != nil {
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return r, false, err
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}
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return r, true, nil
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})
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