math-check.yml

name: Check Math Usage

on:
  push:
    branches: [ 'master', 'release_**' ]
  pull_request:
    branches: [ 'develop', 'release_**' ]
  workflow_dispatch:

jobs:
  check-math:
    runs-on: ubuntu-latest

    steps:
      - uses: actions/checkout@v4

      - name: Check for java.lang.Math usage
        id: check-math
        shell: bash
        run: |
          echo "Checking for java.lang.Math usage..."
          
          touch math_usage.txt
          
          while IFS= read -r file; do
            filename=$(basename "$file")
            if [[ "$filename" == "StrictMathWrapper.java" || "$filename" == "MathWrapper.java" ]]; then
              continue
            fi
          
            perl -0777 -ne '
              s/"([^"\\]|\\.)*"//g;
              s/'\''([^'\''\\]|\\.)*'\''//g;
              s!/\*([^*]|\*[^/])*\*/!!g;
              s!//[^\n]*!!g;
              $hasMath = 0;
              $hasMath = 1 if /^[\s]*import[\s]+java\.lang\.Math\b/m;
              $hasMath = 1 if /\bjava\s*\.\s*lang\s*\.\s*Math\s*\./;
              $hasMath = 1 if /(?<![\w\.])(?<!Strict)Math\s*\./;
              print "$ARGV\n" if $hasMath;
            ' "$file" >> math_usage.txt
          done < <(find . -type f -name "*.java")
          
          sort -u math_usage.txt -o math_usage.txt
          
          if [ -s math_usage.txt ]; then
            echo "❌ Error: Forbidden Math usage found in the following files:"
            cat math_usage.txt
            echo "math_found=true" >> $GITHUB_OUTPUT
            echo "Please use org.tron.common.math.StrictMathWrapper instead of direct Math usage."
          else
            echo "✅ No forbidden Math usage found"
            echo "math_found=false" >> $GITHUB_OUTPUT
          fi

      - name: Upload findings
        if: steps.check-math.outputs.math_found == 'true'
        uses: actions/upload-artifact@v4
        with:
          name: math-usage-report
          path: math_usage.txt

      - name: Create comment
        if: github.event_name == 'pull_request' && steps.check-math.outputs.math_found == 'true'
        uses: actions/github-script@v6
        with:
          script: |
            const fs = require('fs');
            const findings = fs.readFileSync('math_usage.txt', 'utf8');
            const body = `### ❌ Math Usage Detection Results
            
            Found forbidden usage of \`java.lang.Math\` in the following files:
            
            \`\`\`
            ${findings}
            \`\`\`
            
            **Please review if this usage is intended.**
            > [!CAUTION]
            > Note: You should use \`org.tron.common.math.StrictMathWrapper\`.
            > If you need to use \`java.lang.Math\`, please provide a justification.
            `;
            
            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: body
            });

      - name: Fail if Math usage found
        if: steps.check-math.outputs.math_found == 'true'
        run: exit 1