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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
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This PR implements feature request #318 in different approach from PR #1017.
Now it parses ABNF grammar and convert it to EBNF parse-tree.
%import is implemented for convenience, and %terminal to control parse-tree construction.
These directives are non-standard extension to ABNF.
The first commit refactors GrammarBuilder into syntax independent GrammarLoaderBase and the rest so that
we can share/reuse code to implement %import for EBNF and ABNF (and other grammars).
Second commit is a plugin loader. It loads GrammarLoader instance as a plugin from
lark/syntax/*.py.These commits implements PR #1019 in different approach.