# No Future Keywords
# Detects use of future keywords as identifiers
id: no-future-keywords
name: Future Keywords Should Not Be Used as Names
severity: error
category: maintainability
defect_class: correctness
inline_tier: blocking
language: java

message: "'{{NAME}}' is a future keyword and should not be used as an identifier"

description: |
  Using future reserved keywords (assert, enum, etc.) as identifiers
  can cause breaking changes in future Java versions. Use different names.

  ✅ FIX: Use a different identifier name

  ```java
  boolean useAssertions = true;  // GOOD - not 'assert'
  ```

query: |
  (variable_declarator
    name: (identifier) @NAME (#match? @NAME "^(assert|enum|const|goto)$"))
  (method_declaration
    name: (identifier) @NAME (#match? @NAME "^(assert|enum|const|goto)$"))
  (class_declaration
    name: (identifier) @NAME (#match? @NAME "^(assert|enum|const|goto)$"))

metavars:
  - NAME

tags:
  - maintainability
  - java
  - obsolete

examples:
  bad: |
    boolean assert = true;  // BAD - future keyword
    String enum = "value";  // BAD

  good: |
    boolean useAssert = true;  // GOOD
    String enumValue = "value";  // GOOD

has_fix: true
fix_action: rename_identifier