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ABNF grammar support V2 #1022

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ABNF grammar support V2 #1022

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Commits on Oct 19, 2021

  1. Refactor: split do_import into GrammarLoaderBase and grammar specific… 

    … code
    @t-higuchi
    t-higuchi committed Oct 19, 2021
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  2. Grammar loader now can be loaded from lark/syntax/*.py as a plugin

    @t-higuchi
    t-higuchi committed Oct 19, 2021
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  3. Added support for grammar in ABNF format (RFC5234 and RFC7405) 

    Following directives (%import and %terminal) are added as extensions
to ABNF grammar.

Syntax:
 %import module
 %import module (rule1, rule2, ...)
 %terminal rule1, rule2, ...

Example:
 %import core-rules       ; import rules from lark/grammars/core-rules.abnf
 %import core-rules (CRLF, DIGITS) ; import specified rules only
 %terminal CRLF           ; turn rule 'CRLF' into terminal
    @t-higuchi
    t-higuchi committed Oct 19, 2021
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  4. Added the ABNF core rules, defined in RFC5234 appendix B.1, to the st… 

    …andard library.
    @t-higuchi
    t-higuchi committed Oct 19, 2021
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  5. Added example of creating parser using ABNF grammar

    @t-higuchi
    t-higuchi committed Oct 19, 2021
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