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