# Requirements Document

## Introduction

This feature addresses the inconsistent behavior of SQL parsing across different platforms (Windows, Linux, macOS) and Python versions (3.10, 3.11, 3.12, 3.13). The goal is to create a systematic testing and adaptation framework that records platform-specific tree-sitter SQL parsing behaviors and implements appropriate handling strategies to ensure consistent functionality across all supported environments.

## Glossary

- **SQL Parser**: The tree-sitter-sql component responsible for parsing SQL code into an Abstract Syntax Tree (AST)
- **Platform Matrix**: The combination of operating system (Windows, Linux, macOS) and Python version (3.10-3.13)
- **Behavior Profile**: A recorded set of parsing characteristics for a specific platform-Python combination
- **Compatibility Layer**: Code that adapts to platform-specific differences to provide consistent output
- **Test Fixture**: A standardized SQL code sample used for cross-platform testing
- **Parsing Artifact**: The output structure (AST nodes, element types, attributes) produced by the SQL parser

## Requirements

### Requirement 1

**User Story:** As a developer using tree-sitter-analyzer on any platform, I want SQL parsing to work consistently, so that I can analyze SQL code regardless of my operating system or Python version.

#### Acceptance Criteria

1. WHEN the system parses SQL code on any supported platform THEN the system SHALL produce functionally equivalent results
2. WHEN platform-specific differences exist THEN the system SHALL apply appropriate normalization to ensure consistent output
3. WHEN the system encounters an unsupported platform-parser combination THEN the system SHALL provide clear error messages with workaround suggestions
4. WHEN the system initializes SQL parsing THEN the system SHALL detect the current platform and load the appropriate behavior profile
5. WHERE SQL parsing is available THEN the system SHALL document which platforms and Python versions are fully supported

### Requirement 2

**User Story:** As a maintainer of tree-sitter-analyzer, I want a systematic way to record SQL parser behavior across platforms, so that I can understand and handle platform-specific differences.

#### Acceptance Criteria

1. WHEN the behavior recording test suite runs THEN the system SHALL execute standardized SQL test cases on the current platform
2. WHEN parsing results are captured THEN the system SHALL record AST structure, element types, node attributes, and error conditions
3. WHEN the recording completes THEN the system SHALL generate a structured behavior profile file for the platform-Python combination
4. WHEN comparing behavior profiles THEN the system SHALL identify differences in parsing results across platforms
5. WHEN behavior profiles are stored THEN the system SHALL organize them by platform and Python version in a consistent directory structure

### Requirement 3

**User Story:** As a CI/CD pipeline, I want to automatically test SQL parsing behavior across all platform matrices, so that regressions and new incompatibilities are detected early.

#### Acceptance Criteria

1. WHEN the CI/CD pipeline runs THEN the system SHALL execute behavior recording tests on all supported platform-Python combinations
2. WHEN behavior profiles are generated in CI THEN the system SHALL compare them against baseline profiles
3. WHEN significant differences are detected THEN the system SHALL fail the build and report the specific differences
4. WHEN new tree-sitter-sql versions are tested THEN the system SHALL generate updated behavior profiles
5. WHEN the test suite completes THEN the system SHALL produce a compatibility matrix report showing support status for each platform

### Requirement 4

**User Story:** As a tree-sitter-analyzer user, I want the SQL plugin to automatically adapt to my platform, so that I don't need to manually configure platform-specific settings.

#### Acceptance Criteria

1. WHEN the SQL plugin initializes THEN the system SHALL detect the operating system and Python version
2. WHEN a behavior profile exists for the current platform THEN the system SHALL load the appropriate adaptation rules
3. WHEN parsing SQL code THEN the system SHALL apply platform-specific transformations to normalize output
4. WHEN no behavior profile exists THEN the system SHALL attempt parsing with default settings and log a warning
5. WHEN adaptation rules are applied THEN the system SHALL maintain the same output schema across all platforms

### Requirement 5

**User Story:** As a developer debugging SQL parsing issues, I want detailed diagnostic information about platform-specific behavior, so that I can understand why parsing results differ.

#### Acceptance Criteria

1. WHEN diagnostic mode is enabled THEN the system SHALL log the loaded behavior profile and adaptation rules
2. WHEN parsing differences occur THEN the system SHALL log the original parse result and the normalized result
3. WHEN the system applies transformations THEN the system SHALL record which adaptation rules were triggered
4. WHEN generating diagnostic output THEN the system SHALL include platform information, parser version, and behavior profile version
5. WHEN users request platform information THEN the system SHALL provide a command to display the current platform's SQL parsing capabilities

### Requirement 6

**User Story:** As a maintainer, I want comprehensive test fixtures that cover SQL parsing edge cases, so that behavior profiles accurately capture platform differences.

#### Acceptance Criteria

1. WHEN test fixtures are created THEN the system SHALL include samples for all major SQL constructs (tables, views, functions, procedures, triggers, indexes)
2. WHEN test fixtures are designed THEN the system SHALL include edge cases known to cause platform differences
3. WHEN fixtures are executed THEN the system SHALL test both valid SQL and common syntax variations
4. WHEN new SQL features are added THEN the system SHALL extend test fixtures to cover the new constructs
5. WHEN fixtures are maintained THEN the system SHALL document the purpose and expected behavior of each test case

### Requirement 7

**User Story:** As a user on an unsupported platform, I want graceful degradation of SQL functionality, so that other features of tree-sitter-analyzer remain usable.

#### Acceptance Criteria

1. WHEN SQL parsing fails on a platform THEN the system SHALL continue to function for other supported languages
2. WHEN SQL features are unavailable THEN the system SHALL clearly indicate this in error messages and documentation
3. WHEN users attempt SQL operations on unsupported platforms THEN the system SHALL suggest alternative approaches or workarounds
4. WHEN the system detects partial SQL support THEN the system SHALL document which SQL features work and which do not
5. WHEN SQL parsing is disabled THEN the system SHALL remove SQL-related tools from MCP server capabilities
