Struct EmbeddedStdlib 

pub struct EmbeddedStdlib;

The embedded Lark stdlib: all four lark/grammars/*.lark files (embed all four — %import python.X / %import lark.X are working Lark features via its package loader). Baked in via include_str!; no filesystem needed in native/WASM/C.

Trait Implementations

impl GrammarLoader for EmbeddedStdlib

fn read(&self, base: Option<&str>, path: &str) -> Option<(String, String)>

Mirrors FromPackageLoader('lark', ['grammars']).__call__. base = None (library import) searches STDLIB_SEARCH_PATHS, joining os.path.join(dir, path); a hit is an exact match against an embedded resource, returned as the joined path (threaded back as the base for nested imports) + its text.

base = Some(_) always misses. FromPackageLoader raises IOError unless base_path is a PackageResource whose pkg_name matches — a plain string dirname is always rejected. The core only ever constructs string-dirname bases (unpack_import derives Some(dirname(origin)) for a relative import), never a PackageResource, and no embedded grammar performs a relative import (lark.lark’s %import common is a library import → base=None), so the Some arm can never legitimately hit; taking it would false-route a user’s relative import to the embedded stdlib.