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allow only one stab clause without a right-hand-side 

Only one stab clause in a multi-stab-clause expression may be empty.
Multiple is a syntax error.

Co-authored-by: Jonatan Kłosko <jonatanklosko@gmail.com>
This commit is contained in:
Michael Davis 2022-04-12 09:13:02 -05:00
parent 662426cd85
commit 108cdd550f
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GPG Key ID: 25D3AFE4BA2A0C49
2 changed files with 17 additions and 34 deletions
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28
grammar.js
View File

@ -159,16 +159,6 @@ module.exports = grammar({
// * stab arguments item in `arg1, left when right ->` // * stab arguments item in `arg1, left when right ->`
[$.binary_operator, $._stab_clause_arguments_without_parentheses], [$.binary_operator, $._stab_clause_arguments_without_parentheses],
// Given `( -> • \n`, the newline could be either:
// * stab clause without a body
// * stab clause with a body
[$._stab_clause_without_body, $._stab_clause_with_body],
// Given `( -> • /`, `/` token could be either:
// * stab clause with a body
// * -> as an operator followed by `/`
[$._stab_clause_with_body, $.operator_identifier],
// Given `((arg1, arg2 • ,`, `arg3` expression can be either: // Given `((arg1, arg2 • ,`, `arg3` expression can be either:
// * stab parenthesised arguments item in `((arg1, arg2, arg3) ->)` // * stab parenthesised arguments item in `((arg1, arg2, arg3) ->)`
// * stab non-parenthesised arguments item in `((arg1, arg2, arg3 ->))` // * stab non-parenthesised arguments item in `((arg1, arg2, arg3 ->))`
@ -739,20 +729,13 @@ module.exports = grammar({
), ),
stab_clause: ($) => stab_clause: ($) =>
choice($._stab_clause_with_body, $._stab_clause_without_body), // Right precedence, because we want to consume body if any
prec.right(
_stab_clause_with_body: ($) =>
seq( seq(
optional(field("left", $._stab_clause_left)), optional(field("left", $._stab_clause_left)),
field("operator", "->"), field("operator", "->"),
field("right", $.body) optional(field("right", $.body))
), )
_stab_clause_without_body: ($) =>
seq(
optional(field("left", $._stab_clause_left)),
field("operator", "->"),
optional($._terminator)
), ),
_stab_clause_left: ($) => _stab_clause_left: ($) =>
@ -834,10 +817,13 @@ module.exports = grammar({
), ),
body: ($) => body: ($) =>
choice(
$._terminator,
seq( seq(
optional($._terminator), optional($._terminator),
sep1($._expression, $._terminator), sep1($._expression, $._terminator),
optional($._terminator) optional($._terminator)
)
), ),
anonymous_function: ($) => anonymous_function: ($) =>

9
test/corpus/do_end.txt
View File

@ -684,12 +684,11 @@ end
(integer)))))) (integer))))))
===================================== =====================================
stab clause / edge cases / empty right-hand-sides stab clause / edge cases / empty right-hand-side
===================================== =====================================
fun do fun do
x -> x ->
y ->
end end
--- ---
@ -700,10 +699,8 @@ end
(do_block (do_block
(stab_clause (stab_clause
(arguments (arguments
(identifier))) (identifier))
(stab_clause (body)))))
(arguments
(identifier))))))
===================================== =====================================
pattern matching pattern matching