name: CI

on:
  push:
    branches: [master]
    paths:
      - grammar.js
      - src/**
      - test/**
      - bindings/**
      - binding.gyp
  pull_request:
    paths:
      - grammar.js
      - src/**
      - test/**
      - bindings/**
      - binding.gyp

concurrency:
  group: ${{github.workflow}}-${{github.ref}}
  cancel-in-progress: true

jobs:
  test:
    name: Test parser
    runs-on: ${{matrix.os}}
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, windows-latest, macos-14]
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
      - name: Set up tree-sitter
        uses: tree-sitter/setup-action/cli@v1
      - name: Run parser and binding tests
        uses: tree-sitter/parser-test-action@v2
        with:
          generate: true
      - name: Parse sample files
        uses: tree-sitter/parse-action@v4
        id: parse-files
        with:
          files: examples/**
      - name: Upload failures artifact
        uses: actions/upload-artifact@v4
        if: "!cancelled() && steps.parse-files.outcome == 'failure'"
        with:
          name: failures-${{runner.os}}
          path: ${{steps.parse-files.outputs.failures}}
  fuzz:
    name: Fuzz scanner
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 2
      - name: Check for scanner changes
        id: scanner-check
        run: |-
          if git diff --quiet HEAD^ -- src/scanner.c; then
            printf 'changed=false\n' >> "$GITHUB_OUTPUT"
          else
            printf 'changed=true\n' >> "$GITHUB_OUTPUT"
          fi
      - name: Set up tree-sitter
        uses: tree-sitter/setup-action/cli@v1
        if: steps.scanner-check.outputs.changed == 'true'
      - name: Run parser and binding tests
        uses: tree-sitter/parser-test-action@v2
        with:
          generate: true
        if: steps.scanner-check.outputs.changed == 'true'
      - name: Run the fuzzer
        uses: tree-sitter/fuzz-action@v4
        if: steps.scanner-check.outputs.changed == 'true'
  size:
    name: Check grammar size
    runs-on: ubuntu-latest
    if: github.ref != 'refs/heads/master'
    steps:
      - name: Checkout old version
        uses: actions/checkout@v4
        with:
          ref: main
          path: old
      - name: Checkout new version
        uses: actions/checkout@v4
        with:
          path: new
      - name: Set up tree-sitter
        uses: tree-sitter/setup-action/cli@v1
      - name: Generate parser.c for old version
        run: tree-sitter generate --no-bindings
        working-directory: old
      - name: Generate parser.c for new version
        run: tree-sitter generate --no-bindings
        working-directory: new
      - name: Check LARGE_STATE_COUNT
        run: |
          old_size=$(cat old/src/parser.c | grep '#define LARGE_STATE_COUNT' | sed 's/#define LARGE_STATE_COUNT //g')
          new_size=$(cat new/src/parser.c | grep '#define LARGE_STATE_COUNT' | sed 's/#define LARGE_STATE_COUNT //g')

          echo "Checking LARGE_STATE_COUNT"
          echo "Old: $old_size"
          echo "New: $new_size"
          max_size=$(echo "$old_size" "1.2" | awk '{print $1 * $2}' | cut -d "." -f 1)

          if (( $new_size > $max_size )); then
              echo "LARGE_STATE_COUNT increased by more than 20%"
              exit 1
          fi