Go Cleanup Built-in Rules #265

dvmarcilio · 2022-11-10T18:03:26Z

Ongoing work on writing built-in cleanup rules for Go.

polyglot/piranha/Cargo.toml

polyglot/piranha/README.md

polyglot/piranha/src/cleanup_rules/go/rules.toml

ketkarameya · 2022-11-30T14:31:58Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+    (binary_expression
+        left: [(true) (parenthesized_expression (true))]
+        operator:"&&"
+        right : (_)* @rhs


Why do we need * ? There has to be one RHS in the binary expression right?

Done. Thanks!

polyglot/piranha/src/cleanup_rules/go/rules.toml

ketkarameya · 2022-11-30T14:35:47Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+(
+    (binary_expression
+        left: (
+            [


What if we just use a wildcard for @lhs and @rhs ?

Done. Thanks!

polyglot/piranha/src/cleanup_rules/go/rules.toml

ketkarameya · 2022-11-30T14:37:33Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+replace = "@nested.statements"
+replace_node = "nested.block"
+
+# This rule is not deleting multiple statements after return.


IS that some issue with the grammar? Can we look into it ?

We can now successfully match all statements after return_statement in a similar way as e.g., Java and Javascript.
Accounting for the \nterminator did the trick:

(((statement) "\\n"?)+ @post)

However, replace is only working for the first statement. This is also happening in Java (draft PR #284).
The self-edge makes it work for the current implementation.

use dummy node

Introduced dummy node return_cleanup and now we have a cycle

polyglot/piranha/src/cleanup_rules/go/rules.toml

ketkarameya · 2022-12-06T16:47:58Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+query = """
+(
+    (binary_expression
+        left : (_)* @lhs


Suggested change

left : (_)* @lhs

left : (_) @lhs

polyglot/piranha/src/cleanup_rules/go/rules.toml

ketkarameya · 2022-12-06T17:21:44Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+)
+"""
+queries = [
+"""


Add more constraints.

Delete var declaration if all assignments' rhs eq init of var decl;
Delete all assignments if no var decl exists in scope

It turns out that this delete_parent_assignment rule was doing nothing. I removed it, and everything is working as expected.
Well-spotted that the constraint was not working.

polyglot/piranha/src/cleanup_rules/go/rules.toml

ketkarameya · 2022-12-08T15:04:09Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+#
+# Note that this rule *won't* rewrite when @lhs is a call.
+[[rules]]
+groups = ["boolean_expression_simplify"]


We have to think of a strategy to prevent it from simplifying after <something> || true

@ketkarameya should we deal with this in this PR? or do we open a new issue after this is accepted?

i think a follow up would be ok. We can address this alongside the fix for java/kt

ketkarameya · 2022-12-08T15:05:06Z

polyglot/piranha/src/cleanup_rules/go/rules.toml

+#####
+# Dummy rule to introduce a cycle for `delete_statement_after_return`
+[[rules]]
+name = "return_cleanup"


I think there is some naming convention for dummy rules in the readme

Renamed to return_statement_cleanup

ketkarameya · 2022-12-11T16:51:31Z

...ot/piranha/test-resources/go/feature_flag/system_1/const_same_file/configurations/rules.toml

+holes = ["stale_flag_name"]
+
+[[rules]]
+name = "replace_identifier_with_str_literal"


what is the purpose of this rule (And the above one)?

Thanks for the review, @ketkarameya. I agree that this rule is just noise. I restructured this test to have two rules:

find_const_str_literal: finds a constant (@const_id with a value equal to stale_flag_name piranha_argument.

false_flag: replaces with false calls to BoolValue() with an identifier argument equal to @const_id (hole).

Now the test doesn't remove the constant declaration.

ketkarameya

I have left a small comment on the tests. Otherwise this PR looks good to me.

...ot/piranha/test-resources/go/feature_flag/system_1/const_same_file/configurations/rules.toml

- Having the `\n` terminator reproduces the exact matching as languages such as Java and JavaScript

- `@treated` for flag value - `groups` in the end of rule definition - rule that matches first declared first - `false_flag` -> `update_feature_flag_api`

dvmarcilio requested a review from ketkarameya November 10, 2022 18:03

dvmarcilio changed the title ~~Go Cleanup Built-in Rules~~ [WIP] Go Cleanup Built-in Rules Nov 10, 2022

dvmarcilio force-pushed the go_develop branch 3 times, most recently from ee5aa14 to 1db699d Compare November 18, 2022 18:12

dvmarcilio added the polyglot-piranha label Nov 23, 2022

dvmarcilio force-pushed the go_develop branch from 1db699d to df23eba Compare November 23, 2022 14:54

ketkarameya reviewed Nov 30, 2022

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dvmarcilio mentioned this pull request Dec 2, 2022

Failing test for Java delete_all_statements_after_return #284

Draft

dvmarcilio requested a review from ketkarameya December 2, 2022 12:37

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dvmarcilio force-pushed the go_develop branch from 50e4937 to db4c6e6 Compare December 7, 2022 11:10

dvmarcilio marked this pull request as ready for review December 7, 2022 13:40

dvmarcilio changed the title ~~[WIP] Go Cleanup Built-in Rules~~ Go Cleanup Built-in Rules Dec 7, 2022

dvmarcilio requested a review from ketkarameya December 7, 2022 20:13

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ketkarameya mentioned this pull request Dec 11, 2022

Does Piranha support scala projects #199

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dvmarcilio added 22 commits December 18, 2022 20:01

Go simplify_identity: wildcard for lhs and rhs

a6255e2

Go: test for simplify if false with no alternative

d049ed8

Removing .s from delete_parent_assignment

8a24525

* and + rules with \n terminator

fcb1c48

- Having the `\n` terminator reproduces the exact matching as languages such as Java and JavaScript

Go grammar: branch on Uber tree-sitter-go repo

9439bca

return_cleanup <-> delete_stmt_after_return

533a1be

Go: removing * from lhs|rhs captures

8dba1a2

constraint for replace_identifier_with_value

e2c14ec

simplify_something_or_true excluding calls

7dbde04

simplify_something_and_false excluding calls

2fbd662

Removing 'delete_parent_assignment' !

5224867

Adding Go in PiranhaLanguage

189990c

dummy 'return_cleanup' -> 'return_statement_cleanup

171d4dc

Simplifying rules for test "const_same_file"

7759e90

const_same_file tests following conventions

fb72b1f

- `@treated` for flag value - `groups` in the end of rule definition - rule that matches first declared first - `false_flag` -> `update_feature_flag_api`

Removing empty edges.toml

9e8faf3

test_piranha_go: Adding needed import

67b509a

Using treated/treated_complement as arguments in test

1f93f33

Fix .toml formatting

8cbbe3c

cleaning remove_unnecessary_nested_block

0a1d8da

Cleaning delete_statement_after_return

bea7f6f

add missing license

4ce2547

dvmarcilio force-pushed the go_develop branch from ab1c9fb to 4ce2547 Compare December 18, 2022 20:27

dvmarcilio requested a review from ketkarameya December 18, 2022 20:41

ketkarameya approved these changes Dec 19, 2022

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dvmarcilio added 3 commits December 19, 2022 18:11

README: checkmarks for Go

2b584aa

TODO on Cargo.toml to change tree-sitter-go dependency

c8f9942

Merge branch 'master' into go_develop

f0b1f55

dvmarcilio merged commit e2c9338 into master Dec 19, 2022

dvmarcilio deleted the go_develop branch December 19, 2022 18:40

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Go Cleanup Built-in Rules #265

Go Cleanup Built-in Rules #265

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Go Cleanup Built-in Rules #265

Go Cleanup Built-in Rules #265

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