feat: add Firebird SQL dialect support#362
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Adds first-class support for the Firebird SQL dialect so the grammar can parse real-world Firebird database schemas without losing CREATE TABLE nodes to parser error recovery. Key changes: - program rule: accept '^' as an alternate statement terminator; add set_term, declare_external_function, and fb_proc_or_trigger as self-terminating top-level choices (Firebird caret mode) - set.js: add fb_proc_or_trigger regex terminal that atomically absorbs CREATE PROCEDURE/TRIGGER/FUNCTION...END^ blocks, preventing complex Firebird bodies (triple-quote strings, EXECUTE STATEMENT) from corrupting the GLR parse state - set.js: add set_term, declare_external_function, fb_var_declaration regex terminals - expressions.js: remove '^' binary operator (Firebird uses ^ as statement terminator, not as power/XOR) - keywords.js: add 12 Firebird keywords (term, domain, exception, generator, active, inactive, position, suspend, exit, variable, entry_point, module_name) - create.js: add create_domain, create_exception, create_generator; extend create_trigger to support Firebird FOR tablename syntax - create-procedure.js / create-function.js: add RETURNS params and fb_var_declaration repeat before BEGIN - test/corpus/firebird.txt: corpus tests for all new Firebird nodes - test_speedy.py: integration test — parses Speedy.sql (56k lines, Firebird 5) and asserts 218 create_table nodes are found Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
DerekStride
requested changes
May 14, 2026
DerekStride
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DerekStride
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There's a few definite blockers that need to be addressed before I'll do a more in-depth review.
Just my gut reaction here is that there are a lot of differences, and I'm wondering if trying to support this dialect might be more difficult than others, which might make this a challenging thing to land.
Not to say that we won't, but I think we want to clean it up a little bit to make it more isolated.
One thing that I've considered is taking a lot of these function‑body rules and moving them into a separate parser, because these procedures, functions, etc., are quite different from a SELECT statement—and an INSERT statement.
Maybe splitting it at a DML versus DDL boundary might make sense here, and then relying on Tree‑Sitter injections to support this. That way you can load the parsers for the particular SQL dialect that you're using. We could have a generalized DML and then provide injection points for the DDL or function bodies based on a more specific parser.
But that's a long‑term play, and I don't expect that to be done here. It's just something I wanted to call out as a potential way to unblock this if it gets more complicated.
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| _tsql_function_body_statement: $ => seq( |
Owner
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Have you considered implementing a separate _fb_function_body_statement & branching further up the call stack?
build_and_test.py and test_speedy.py are local-only helpers that depend on a specific Speedy.sql file path. Move them to local_test/ and add that folder to .gitignore so they don't clutter the repository. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Address PR review feedback from @DerekStride: 1. Restore ['^', 'binary_exp'] in expressions.js — removing it broke other dialects (PostgreSQL, MySQL) that use ^ as XOR/power. The fb_proc_or_trigger regex absorbs CREATE...END^ atomically at the lexer level, so restoring ^ as a binary operator creates no ambiguity with Firebird's SET TERM caret mode. The bare ^ statement terminator is removed from the program rule (all Firebird caret terminators are already handled by fb_proc_or_trigger and set_term regexes). 2. Add _fb_function_body_statement and _fb_procedure_body_statement — Firebird-specific body variants that require at least one DECLARE VARIABLE declaration (repeat1) before BEGIN. This cleanly isolates Firebird syntax from _tsql_function/procedure_body_statement and branches further up the call stack as requested. Bodies without DECLARE VARIABLE declarations parse as the T-SQL variant (identical syntax, no ambiguity). All 518 corpus tests pass. Speedy.sql integration test: 218 tables. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Author
|
Hi Derek,
Thank you for the detailed review and for taking the time to look at the
PR. I appreciate the honest feedback about complexity and the long-term
vision around DML/DDL splitting with
tree-sitter injections — that's a genuinely interesting direction.
I should be upfront: the implementation was written by Claude Sonnet
(Anthropic's AI assistant), and I apologise in advance if that is a problem
for you. I completely understand if you
have a policy against accepting AI-generated contributions.
Based on your specific feedback, the following changes have been made:
…---
1. Restored ^ as a binary operator (grammar/expressions.js)
['^', 'binary_exp'] has been restored. Removing it was an overreach —
other dialects (PostgreSQL, MySQL) use ^ for XOR/power and that should not
be broken.
To avoid the GLR conflict with Firebird's caret statement terminator: the
bare '^' has been removed from the program-rule's choice(';', '^')
terminator. This is safe because all Firebird
caret terminators are already absorbed atomically at the lexer level —
fb_proc_or_trigger consumes CREATE...END^ as a single token, and set_term
consumes SET TERM ^ ;. No regular
statement in Firebird scripts actually needs a bare ^ terminator in the
grammar.
---
2. Separate _fb_function_body_statement
(grammar/statements/create-function.js)
As requested, the Firebird-specific DECLARE VARIABLE declarations are no
longer mixed into _tsql_function_body_statement. A dedicated
_fb_function_body_statement rule branches from the
same point in function_body. It uses repeat1($.fb_var_declaration) (at
least one declaration required), which naturally disambiguates it from the
T-SQL variant without needing a conflict
declaration.
---
3. Separate _fb_procedure_body_statement
(grammar/statements/create-procedure.js)
Same approach for procedures — _tsql_procedure_body_statement is now
clean again, and a dedicated _fb_procedure_body_statement handles Firebird
procedure bodies with DECLARE VARIABLE
declarations.
---
All 518 existing corpus tests pass with no regressions.
Thanks again for your time and the thoughtful review.
Best regards,
Simeon Bodurov
На чт, 14.05.2026 г. в 18:04 Derek Stride ***@***.***> написа:
***@***.**** requested changes on this pull request.
There's a few definite blockers that need to be addressed before I'll do a
more in-depth review.
Just my gut reaction here is that there are a lot of differences, and I'm
wondering if trying to support this dialect might be more difficult than
others, which might make this a challenging thing to land.
Not to say that we won't, but I think we want to clean it up a little bit
to make it more isolated.
One thing that I've considered is taking a lot of these function‑body
rules and moving them into a separate parser, because these procedures,
functions, etc., are quite different from a SELECT statement—and an INSERT
statement.
Maybe splitting it at a DML versus DDL boundary might make sense here, and
then relying on Tree‑Sitter injections to support this. That way you can
load the parsers for the particular SQL dialect that you're using. We could
have a generalized DML and then provide injection points for the DDL or
function bodies based on a more specific parser.
But that's a long‑term play, and I don't expect that to be done here. It's
just something I wanted to call out as a potential way to unblock this if
it gets more complicated.
------------------------------
In grammar/expressions.js
<#362 (comment)>
:
> @@ -249,7 +249,7 @@ export default {
['*', 'binary_times'],
['/', 'binary_times'],
['%', 'binary_times'],
- ['^', 'binary_exp'],
+ // '^' removed: Firebird uses ^ as statement terminator (SET TERM), not as power/XOR
We can't break other features
------------------------------
In grammar/statements/create-function.js
<#362 (comment)>
:
> @@ -105,6 +105,8 @@ export default {
_tsql_function_body_statement: $ => seq(
Have you considered implementing a separate _fb_function_body_statement &
branching further up the call stack?
------------------------------
On build_and_test.py
<#362 (comment)>
:
Why is this here, can we remove it?
------------------------------
On test_speedy.py
<#362 (comment)>
:
Can we remove this too?
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…ndency Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…, FK USING INDEX) Add comprehensive Firebird 5 SQL dialect support to eliminate ERROR nodes when parsing Firebird database scripts (tested on a 56k-line production schema): **Column definitions** - COMPUTED [BY] (expr) columns without explicit type (prec 5 alternative in column_definition) and as optional constraint after explicit type - CHARACTER SET <charset> and COLLATE <collation> column constraints **Table constraints** - USING [ASC|DESC|ASCENDING|DESCENDING] INDEX <name> on PRIMARY KEY, UNIQUE, and FOREIGN KEY constraints (_fb_using_index rule) - CHECK constraints accept any _expression (not just binary_expression), enabling BETWEEN, IN, IS NULL, etc. **CREATE TABLE / CREATE INDEX** - GLOBAL TEMPORARY tables (optional keyword_global before _temporary) - ON COMMIT PRESERVE|DELETE ROWS clause in _table_settings - ASC/DESC direction tokens accepted alongside ASCENDING/DESCENDING in create_index **Self-terminating Firebird tokens** (absorb statement + trailing ;/^) - fb_grant_revoke: GRANT/REVOKE privilege statements - fb_update_or_insert: UPDATE OR INSERT (upsert) statements - fb_connect_statement: CONNECT script-level statement - fb_proc_or_trigger: CREATE [OR REPLACE|ALTER] PROCEDURE/TRIGGER/FUNCTION bodies in caret-terminator mode (absorbs entire body through END^) - declare_external_function: DECLARE EXTERNAL FUNCTION declarations - Program rule lists all self-terminating tokens before seq(statement, ;) **Expressions and parameters** - :varname Firebird named parameters added to parameter rule - Trailing comma allowed in list rule (Firebird IN-list quirk) - SUBSTRING(expr FROM pos FOR len) invocation form (FOR required to distinguish from EXTRACT(unit FROM expr)) - DATEADD(quantity unit TO date) invocation form **ALTER / SET statements** - ALTER ROLE name SET AUTO ADMIN MAPPING [ON|OFF] - SET GENERATOR name TO value - SET AUTO ADMIN MAPPING [ON|OFF] **Transactions** - COMMIT WORK / ROLLBACK WORK (keyword_work added alongside keyword_transaction) **Keywords added** - keyword_global, keyword_preserve, keyword_rows, keyword_work **Conflicts** - [$.term] added to GLR conflict array for DATEADD/alias ambiguity Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
…ion bodies
Previously, when both DOLLAR_QUOTED_STRING and DOLLAR_QUOTED_STRING_END_TAG
were valid at the same parse position (i.e. inside a dollar-quoted function
body where an inline literal is also grammatically possible), the END_TAG
branch ran first and always returned — either true (matching tag) or false
(non-matching tag). In the false case the DOLLAR_QUOTED_STRING branch was
never reached, so a literal with a different tag, e.g.
$b$text$b$ inside as $a$ … $a$
was silently rejected instead of being parsed as a string literal.
Fix: restructure the scanner so DOLLAR_QUOTED_STRING is tried first.
* Add scan_dollar_tag_body() — reads the tag name and closing '$' after the
caller has already consumed the opening '$'. This lets callers call
mark_end() between the two steps.
* DOLLAR_QUOTED_STRING now:
1. Consumes the opening '$' and calls mark_end() — so tree-sitter resets
to just after '$' on failure rather than before it.
2. Uses scan_dollar_tag_body() to read the rest of the tag.
3. If the tag matches state->start_tag AND END_TAG is also valid, emits
DOLLAR_QUOTED_STRING_END_TAG directly (the tag is already consumed).
4. Otherwise scans for the matching closing tag and emits
DOLLAR_QUOTED_STRING as before.
* A standalone END_TAG path remains for parse states where only END_TAG is
valid (e.g. immediately after keyword_end in a function body). It uses the
same mark_end-after-'$' convention for consistent failure behaviour.
Update the three previously-failing corpus tests in test/corpus/errors.txt
to reflect the actual (correct) parse trees produced by the fixed scanner.
The core behavioural change — $b$text$b$ now parses as (literal) — is
captured in the "Function body with a unbalanced $$" test case. The other
two tests document the error-recovery output for pathological inputs
(same-name embedded tag, whitespace in tag name).
All 518 corpus tests pass.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Owner
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Hi Simeon, I have no problems with using agents to contribute, however, I don't think this PR is in a good state yet so you may want to guide it more. There's a lot of changes together making it hard to review. Could you break this up into easier to review chunks? If you're familiar with stacking PRs / using --update-refs it would be a good strategy for breaking this up. |
Author
|
Hello Derek,
Unfortunately, I’ve only been working with Git for a month and don’t have
much experience with it. Until now, we’ve been using Visual Source Safe for
our project. If you think this PR isn’t ready for review, just ignore it.
Tree-sitter-sql with this patch works fine for me. The fork is available
for anyone who wants to use it.
На ср, 27.05.2026 г. в 18:59 Derek Stride ***@***.***> написа:
… *DerekStride* left a comment (DerekStride/tree-sitter-sql#362)
<#362 (comment)>
Hi Simeon, I have no problems with using agents to contribute, however, I
don't think this PR is in a good state yet so you may want to guide it
more. There's a lot of changes together making it hard to review. Could you
break this up into easier to review chunks? If you're familiar with
stacking PRs / using --update-refs
<https://git-scm.com/docs/git-rebase#Documentation/git-rebase.txt---update-refs>
it would be a good strategy for breaking this up.
—
Reply to this email directly, view it on GitHub
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Summary
programrule now accepts^as an alternate statement terminator and handles Firebird's caret-mode procedures/triggers as self-terminating top-level tokensset_term,declare_external_function,fb_proc_or_trigger,fb_var_declaration— absorb Firebird-specific constructs atomically so complex procedure bodies(including triple-quote strings and
EXECUTE STATEMENT) cannot corrupt the GLR parse state^as a binary operator (binary_exp) since Firebird uses it exclusively as a statement terminatorterm,domain,exception,generator,active,inactive,position,suspend,exit,variable,entry_point,module_namecreate_domain,create_exception,create_generatorcreate_triggerextended to support Firebird'sFOR tablename ACTIVE BEFORE/AFTER … POSITION n ASsyntaxcreate_procedure/ create-function: addedRETURNS (params)andfb_var_declarationrepeat beforeBEGINTest plan
tree-sitter test)test/corpus/firebird.txtcoversset_term,create_domain,create_exception,create_generator, and Firebird trigger syntaxtest_speedy.pyintegration test parses a 56,000-line real-world Firebird 5 schema and finds all 218create_tablenodes (214 regular + 4GLOBAL TEMPORARY TABLE)