Add project files

.github/workflows/build.yml

@@ -0,0 +1,52 @@
+name: build
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - { name: linux-gcc,      os: ubuntu-latest,  cc: gcc,   cxx: g++ }
+          - { name: linux-clang,    os: ubuntu-latest,  cc: clang, cxx: clang++ }
+          - { name: windows-msvc,   os: windows-latest }
+          - { name: windows-mingw,  os: windows-latest, generator: MinGW Makefiles, cc: gcc, cxx: g++ }
+          - { name: macos-clang,    os: macos-latest }
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: '17'
+
+      - name: Configure
+        shell: bash
+        run: |
+          args=(-B build -DCMAKE_BUILD_TYPE=Release -DANTLRLAB_DOWNLOAD_JAR=ON)
+          if [ -n "${{ matrix.generator }}" ]; then args+=(-G "${{ matrix.generator }}"); fi
+          if [ -n "${{ matrix.cc }}" ]; then args+=(-DCMAKE_C_COMPILER=${{ matrix.cc }} -DCMAKE_CXX_COMPILER=${{ matrix.cxx }}); fi
+          cmake "${args[@]}"
+
+      - name: Build
+        run: cmake --build build --config Release --parallel
+
+      - name: Self-test and examples
+        shell: bash
+        run: |
+          BIN=$(find build -type f \( -name antlrlab -o -name antlrlab.exe \) -not -path '*/CMakeFiles/*' | head -n 1)
+          echo "using $BIN"
+          "$BIN" --version
+          "$BIN" --selftest
+          "$BIN" examples/combined/Expr.g4 -t "1 + 2" --no-color
+          "$BIN" -g examples/split/CalcLexer.g4 -g examples/split/CalcParser.g4 -i examples/split/input.txt -q --no-color
+          "$BIN" examples/json/JSON.g4 examples/json/example.json -q --no-color
+          # a syntax error must give exit status 1
+          set +e
+          "$BIN" examples/combined/Expr.g4 examples/combined/input_bad.txt -q --no-color
+          test $? -eq 1