ProjectionExpression

The names of the product elements

The name of the type

Unsafe version of parse that throws an IllegalStateException rather than returning an Either. Note all path elements are substituted automatically using the ExpressionAttributeNames facility. The underscore "_" and hypen "-" are allowed in the name without any escaping. Any other special characters must be escaped with backticks as the first and last characters.

Examples:

$("foo")            // simple map element
$("foo.bar[9].baz") // array element with nested access
$("`foo.bar`")      // simple map element with a dot in the name
$("foo_bar")        // simple map element
$("foo-bar")        // simple map element

Parses a string into an ProjectionExpression Note all path elements are substituted automatically using the ExpressionAttributeNames facility. The underscore "_" and hypen "-" are allowed in the name without any escaping. Any other special characters must be escaped with backticks as the first and last characters. eg

parse("foo.bar[9].baz"")
// Right(MapElement(ListElement(MapElement(Root(bar),baz),9),baz))
parse(fo$$o.ba$$r[9].ba$$z)
// Left("error with fo$$o,error with ba$$r[9],error with ba$$z")