[jira] Updated: (LUCY-29) Speed up Boilerplater::Parser and improve test coverage.

["Marvin Humphrey (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCY-29?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Marvin Humphrey updated LUCY-29:
--------------------------------

    Attachment: parser_speed_and_coverage.diff

> Speed up Boilerplater::Parser and improve test coverage.
> --------------------------------------------------------
>
>                 Key: LUCY-29
>                 URL: https://issues.apache.org/jira/browse/LUCY-29
>             Project: Lucy
>          Issue Type: Sub-task
>          Components: Boilerplater
>            Reporter: Marvin Humphrey
>            Assignee: Marvin Humphrey
>         Attachments: parser_speed_and_coverage.diff
>
>
> The production for composite types in Boilerplater::Parser is inefficient,
> because it builds a simple Type object before failing to match, and this Type
> object is subsequently discarded when the parser backtracks.  The simple Type
> -- which matched, on the way to failing to create a complete composite type --
> now must be built up again.
> By using the simple Type object rather than discarding it when the composite
> type fails to match, we can speed up the parser by around 30%.
> This patch also expands the test coverage for the parser, adding tests for
> many lower level productions.

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