rm-hull / jasengo / 19392761981

Pull #3

github

feat: Add worked example + some needed parser combinators

Introduce several common parser primitives and combinators
essential for building practical parsers.

New primitives in `basic.go`:
*   `Lower`, `Upper`: Match corresponding character types.
*   `Whitespace`: Matches spaces, tabs, newlines.
*   `Return`: Lifts a value into a successful parser result.

New combinators in `combinators.go`:
*   `Token`, `Symb`: Handle tokenizing and symbol matching,
    consuming trailing whitespace automatically.
*   `Left`, `Right`, `Between`: Control result selection in sequence.
*   `Rec`: Enables definition of recursive parsers.
*   `SepBy1`: Parses one or more items separated by a delimiter.

A new test (`TestSearchGrammar`) demonstrates the usage of
these tools to parse complex boolean search expressions.

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