# CSS Calc Spacing
# Detects calc() operands without correct spacing
id: calc-spacing
name: calc Operands Should Be Correctly Spaced
severity: error
category: reliability
defect_class: correctness
inline_tier: blocking
language: css

message: "calc() operands should be correctly spaced"

description: |
  calc() expressions require spaces around + and - operators.
  Without spaces, they may be parsed as signs instead of operators.

  ✅ FIX: Add spaces around + and -

  ```css
  width: calc(100% - 20px);  /* GOOD - spaces */
  ```

query: |
  (call_expression
    function: (function_name) @FUNC (#eq? @FUNC "calc")
    arguments: (arguments
      (binary_expression
        operator: ("+" | "-") @OP) @EXPR))

metavars:
  - FUNC
  - OP
  - EXPR

post_filter: calc_missing_spaces

tags:
  - reliability
  - css
  - syntax

examples:
  bad: |
    width: calc(100%-20px);  /* BAD - no spaces */

  good: |
    width: calc(100% - 20px);  /* GOOD - spaces */

has_fix: true
fix_action: add_calc_spaces