import: go: Upgrade go.mod parser.

Upgrade the go.mod parser to handle the full go.mod spec, and to gracefully
handle unexpected/malformed syntax.  Restructure parser usage, making the
parse tree available for other uses.

guix/import/go.scm (parse-go.mod): Parse using (ice-9 peg) instead of
regex matching for more robustness.  Return a list of directives.
(go.mod-directives): New procedure.
(go.mod-requirements): Likewise.
(go-module->guix-package): Use it.
(%go.mod-replace-directive-rx): Remove unused variable.
tests/go.scm (testing-parse-mod): Adjust accordingly.
(go.mod-requirements)
(fixture-go-mod-unparseable)
(fixture-go-mod-retract)
(fixture-go-mod-strings): New variables.
("parse-go.mod: simple")
("parse-go.mod: comments and unparseable lines")
("parse-go.mod: retract")
("parse-go.mod: raw strings and quoted strings")
("parse-go.mod: complete"): New tests.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>

0 files changed, 0 insertions, 0 deletions