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feat: Java bindings (#481)
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‎.github/workflows/build.yml

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- master
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schedule: [cron: "40 1 * * *"]
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env:
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JAVA_VERSION: "17"
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jobs:
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commitsar:
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name: Verify commit messages
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set -e
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yarn test
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test-java:
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strategy:
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fail-fast: false
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matrix:
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os: [ubuntu-22.04, macos-13, windows-2022]
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name: Java 17 on ${{ matrix.os }}
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runs-on: ${{ matrix.os }}
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steps:
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- uses: actions/checkout@v4
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- name: Build native library
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# Build with `--release` as Gradle config expects `target/release`
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run: cargo build --release
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working-directory: bindings/java
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- name: Set up Java
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uses: actions/setup-java@v4
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with:
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distribution: "temurin"
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java-version: ${{ env.JAVA_VERSION }}
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- name: Setup Gradle
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uses: gradle/actions/setup-gradle@v4
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- name: Run tests
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working-directory: bindings/java
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run: gradle clean test
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test-python:
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strategy:
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fail-fast: false

‎.github/workflows/java-release.yml

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name: "[Java] Release"
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on:
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push:
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tags:
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- java-v*
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defaults:
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run:
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shell: bash
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concurrency:
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group: ${{ github.workflow }}-${{ github.ref }}
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cancel-in-progress: true
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env:
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JAVA_VERSION: "17"
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jobs:
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build-native-libraries:
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strategy:
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matrix:
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include:
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- os: ubuntu-22.04
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target: x86_64-unknown-linux-gnu
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lib: libcss_inline.so
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platform: linux-x86_64
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- os: macos-13
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target: x86_64-apple-darwin
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lib: libcss_inline.dylib
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platform: darwin-x86_64
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- os: macos-14
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target: aarch64-apple-darwin
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lib: libcss_inline.dylib
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platform: darwin-aarch64
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- os: windows-2022
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target: x86_64-pc-windows-msvc
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lib: css_inline.dll
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platform: win32-x86_64
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name: Build native library for ${{ matrix.target }}
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runs-on: ${{ matrix.os }}
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steps:
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- uses: actions/checkout@v4
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- uses: dtolnay/rust-toolchain@stable
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with:
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targets: ${{ matrix.target }}
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- uses: Swatinem/rust-cache@v2
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with:
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workspaces: |
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css-inline
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bindings/java
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- name: Build native library
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working-directory: bindings/java
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run: cargo build --release --target ${{ matrix.target }}
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- name: Upload native library
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uses: actions/upload-artifact@v4
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with:
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name: native-${{ matrix.platform }}
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if-no-files-found: error
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path: bindings/java/target/${{ matrix.target }}/release/${{ matrix.lib }}
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build-jar:
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name: Build JAR file
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runs-on: ubuntu-22.04
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needs: build-native-libraries
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steps:
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- uses: actions/checkout@v4
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- name: Set up Java
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uses: actions/setup-java@v4
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with:
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distribution: "temurin"
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java-version: ${{ env.JAVA_VERSION }}
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- name: Download all native libraries
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uses: actions/download-artifact@v4
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with:
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path: native-libs
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- name: Assemble JAR with native libraries
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working-directory: bindings/java
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run: |
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mkdir -p src/main/resources/org/cssinline/native/{linux-x86_64,darwin-x86_64,darwin-aarch64,win32-x86_64}
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# Copy native libraries to their expected location
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cp ../../native-libs/native-linux-x86_64/libcss_inline.so src/main/resources/org/cssinline/native/linux-x86_64/
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cp ../../native-libs/native-darwin-x86_64/libcss_inline.dylib src/main/resources/org/cssinline/native/darwin-x86_64/
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cp ../../native-libs/native-darwin-aarch64/libcss_inline.dylib src/main/resources/org/cssinline/native/darwin-aarch64/
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cp ../../native-libs/native-win32-x86_64/css_inline.dll src/main/resources/org/cssinline/native/win32-x86_64/
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gradle build --info
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- name: Upload JAR
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uses: actions/upload-artifact@v4
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with:
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name: java-jar
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if-no-files-found: error
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path: bindings/java/build/libs/*.jar
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test-jar:
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needs: build-jar
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strategy:
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matrix:
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include:
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- os: ubuntu-22.04
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platform: linux-x86_64
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- os: macos-13
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platform: darwin-x86_64
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- os: macos-14
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platform: darwin-aarch64
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- os: windows-2022
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platform: win32-x86_64
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name: Test JAR on ${{ matrix.platform }}
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runs-on: ${{ matrix.os }}
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steps:
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- name: Set up Java
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uses: actions/setup-java@v4
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with:
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distribution: "temurin"
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java-version: ${{ env.JAVA_VERSION }}
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- name: Download JAR
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uses: actions/download-artifact@v4
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with:
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name: java-jar
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- name: Integration test on ${{ matrix.platform }}
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run: |
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cat > Test.java << 'EOF'
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import org.cssinline.CssInline;
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public class Test {
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public static void main(String[] args) {
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String html = "<html><head><style>h1{color:red}</style></head><body><h1>Test</h1></body></html>";
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String result = CssInline.inline(html);
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if (!result.contains("style=\"color: red;\"")) {
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throw new RuntimeException("Expected inlined style not found in: " + result);
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}
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System.out.println("✓ Integration test passed on ${{ matrix.platform }}");
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}
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}
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EOF
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JAR_FILE=$(ls *.jar)
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if [[ "$RUNNER_OS" == "Windows" ]]; then
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CLASSPATH_SEP=";"
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else
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CLASSPATH_SEP=":"
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fi
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javac -cp "$JAR_FILE" Test.java
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java -cp "$JAR_FILE${CLASSPATH_SEP}." Test
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publish-github-packages:
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name: Publish to GitHub Packages
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runs-on: ubuntu-22.04
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needs: [build-jar, test-jar]
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if: startsWith(github.ref, 'refs/tags/java-v')
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permissions:
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contents: read
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packages: write
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steps:
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- uses: actions/checkout@v4
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- name: Set up Java
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uses: actions/setup-java@v4
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with:
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distribution: "temurin"
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java-version: ${{ env.JAVA_VERSION }}
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- name: Download JAR artifact
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uses: actions/download-artifact@v4
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with:
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name: java-jar
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path: bindings/java/build/libs
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- name: Extract version
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run: echo "version=${GITHUB_REF#refs/tags/java-v}" >> $GITHUB_ENV
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- name: Publish to GitHub Packages
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working-directory: bindings/java
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run: gradle publish -Pversion=${{ env.version }}
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env:
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GITHUB_ACTOR: ${{ github.actor }}
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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release:
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name: Create GitHub Release
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runs-on: ubuntu-22.04
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needs: [build-jar, test-jar, publish-github-packages]
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if: startsWith(github.ref, 'refs/tags/java-v')
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steps:
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- name: Download JAR
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uses: actions/download-artifact@v4
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with:
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name: java-jar
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path: dist
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- name: Extract version
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run: echo "version=${GITHUB_REF#refs/tags/java-v}" >> $GITHUB_ENV
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- name: GitHub Release
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uses: softprops/action-gh-release@v2
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with:
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make_latest: false
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draft: true
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name: "[Java] Release ${{ env.version }}"
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files: dist/*.jar

‎README.md

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- Optionally caches external stylesheets
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- Works on Linux, Windows, and macOS
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- Supports HTML5 & CSS3
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- Bindings for [Python](https://github.com/Stranger6667/css-inline/tree/master/bindings/python), [Ruby](https://github.com/Stranger6667/css-inline/tree/master/bindings/ruby), [JavaScript](https://github.com/Stranger6667/css-inline/tree/master/bindings/javascript), [C](https://github.com/Stranger6667/css-inline/tree/master/bindings/c), and a [WebAssembly](https://github.com/Stranger6667/css-inline/tree/master/bindings/javascript/wasm) module to run in browsers.
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- Bindings for [Python](https://github.com/Stranger6667/css-inline/tree/master/bindings/python), [Ruby](https://github.com/Stranger6667/css-inline/tree/master/bindings/ruby), [JavaScript](https://github.com/Stranger6667/css-inline/tree/master/bindings/javascript), [Java](https://github.com/Stranger6667/css-inline/tree/master/bindings/java), [C](https://github.com/Stranger6667/css-inline/tree/master/bindings/c), and a [WebAssembly](https://github.com/Stranger6667/css-inline/tree/master/bindings/javascript/wasm) module to run in browsers.
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- Command Line Interface
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## Playground

‎bindings/java/.gitignore

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.gradle/
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build/

‎bindings/java/CHANGELOG.md

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# Changelog
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## Unreleased
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- Initial public release

‎bindings/java/Cargo.toml

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[package]
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name = "css_inline"
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version = "0.15.0"
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edition = "2024"
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authors = ["Dmitry Dygalo <[email protected]>"]
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[lib]
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crate-type = ["cdylib"]
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path = "src/main/rust/lib.rs"
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[dependencies]
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jni = "0.21.1"
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[dependencies.css-inline]
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path = "../../css-inline"
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version = "*"
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default-features = false
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features = ["http", "file", "stylesheet-cache"]

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