Add Java support

codecrafters-io · Nov 4, 2024 · 69e04bd · 69e04bd
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diff --git a/compiled_starters/java/.codecrafters/compile.sh b/compiled_starters/java/.codecrafters/compile.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+mvn -B package -Ddir=/tmp/codecrafters-build-interpreter-java
diff --git a/compiled_starters/java/.codecrafters/run.sh b/compiled_starters/java/.codecrafters/run.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+exec java -jar /tmp/codecrafters-build-interpreter-java/codecrafters-interpreter.jar "$@"
diff --git a/compiled_starters/java/.gitattributes b/compiled_starters/java/.gitattributes
@@ -0,0 +1 @@
+* text=auto
diff --git a/compiled_starters/java/.gitignore b/compiled_starters/java/.gitignore
@@ -0,0 +1,3 @@
+*.jar
+target/
+.idea/
diff --git a/compiled_starters/java/README.md b/compiled_starters/java/README.md
@@ -0,0 +1,50 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/interpreter.png)
+
+This is a starting point for Java solutions to the
+["Build your own Interpreter" Challenge](https://app.codecrafters.io/courses/interpreter/overview).
+
+This challenge follows the book
+[Crafting Interpreters](https://craftinginterpreters.com/) by Robert Nystrom.
+
+In this challenge you'll build an interpreter for
+[Lox](https://craftinginterpreters.com/the-lox-language.html), a simple
+scripting language. Along the way, you'll learn about tokenization, ASTs,
+tree-walk interpreters and more.
+
+Before starting this challenge, make sure you've read the "Welcome" part of the
+book that contains these chapters:
+
+- [Introduction](https://craftinginterpreters.com/introduction.html) (chapter 1)
+- [A Map of the Territory](https://craftinginterpreters.com/a-map-of-the-territory.html)
+  (chapter 2)
+- [The Lox Language](https://craftinginterpreters.com/the-lox-language.html)
+  (chapter 3)
+
+These chapters don't involve writing code, so they won't be covered in this
+challenge. This challenge will start from chapter 4,
+[Scanning](https://craftinginterpreters.com/scanning.html).
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your program is in `src/main/java/Main.java`. Study and
+uncomment the relevant code, and push your changes to pass the first stage:
+
+```sh
+git commit -am "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `mvn` installed locally
+2. Run `./your_program.sh` to run your program, which is implemented in
+   `src/main/java/Main.java`.
+3. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
diff --git a/compiled_starters/java/codecrafters.yml b/compiled_starters/java/codecrafters.yml
@@ -0,0 +1,11 @@
+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Java version used to run your code
+# on Codecrafters.
+#
+# Available versions: java-23
+language_pack: java-23
diff --git a/compiled_starters/java/pom.xml b/compiled_starters/java/pom.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>io.codecrafters</groupId>
+    <artifactId>codecrafters-interpreter</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <maven.compiler.source>23</maven.compiler.source>
+        <maven.compiler.target>23</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>23</java.version>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <finalName>codecrafters-interpreter</finalName> <!-- Please do not change this final artifact name-->
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <appendAssemblyId>false</appendAssemblyId>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <!-- This is the main class of your program which will be executed-->
+                            <mainClass>Main</mainClass>
+                        </manifest>
+                    </archive>
+                    <outputDirectory>${dir}</outputDirectory>
+                </configuration>
+
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/compiled_starters/java/src/main/java/Main.java b/compiled_starters/java/src/main/java/Main.java
@@ -0,0 +1,39 @@
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class Main {
+  public static void main(String[] args) {
+    // You can use print statements as follows for debugging, they'll be visible when running tests.
+    System.err.println("Logs from your program will appear here!");
+
+    if (args.length < 2) {
+      System.err.println("Usage: ./your_program.sh tokenize <filename>");
+      System.exit(1);
+    }
+
+    String command = args[0];
+    String filename = args[1];
+
+    if (!command.equals("tokenize")) {
+      System.err.println("Unknown command: " + command);
+      System.exit(1);
+    }
+
+    String fileContents = "";
+    try {
+      fileContents = Files.readString(Path.of(filename));
+    } catch (IOException e) {
+      System.err.println("Error reading file: " + e.getMessage());
+      System.exit(1);
+    }
+
+    // Uncomment this block to pass the first stage
+    // 
+    // if (fileContents.length() > 0) {
+    //   throw new RuntimeException("Scanner not implemented");
+    // } else {
+    //   System.out.println("EOF  null"); // Placeholder, remove this line when implementing the scanner
+    // }
+  }
+}
diff --git a/compiled_starters/java/your_program.sh b/compiled_starters/java/your_program.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# Use this script to run your program LOCALLY.
+#
+# Note: Changing this script WILL NOT affect how CodeCrafters runs your program.
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit early if any commands fail
+
+# Copied from .codecrafters/compile.sh
+#
+# - Edit this to change how your program compiles locally
+# - Edit .codecrafters/compile.sh to change how your program compiles remotely
+(
+  cd "$(dirname "$0")" # Ensure compile steps are run within the repository directory
+  mvn -B package -Ddir=/tmp/codecrafters-build-interpreter-java
+)
+
+# Copied from .codecrafters/run.sh
+#
+# - Edit this to change how your program runs locally
+# - Edit .codecrafters/run.sh to change how your program runs remotely
+exec java -jar /tmp/codecrafters-build-interpreter-java/codecrafters-interpreter.jar "$@"
diff --git a/course-definition.yml b/course-definition.yml
@@ -27,6 +27,8 @@ languages:
   - slug: "c"
   - slug: "gleam"
   - slug: "go"
+  - slug: "java"
+    release_status: "alpha"
   - slug: "kotlin"
   - slug: "ocaml"
   - slug: "python"

diff --git a/dockerfiles/java-23.Dockerfile b/dockerfiles/java-23.Dockerfile
@@ -0,0 +1,13 @@
+# syntax=docker/dockerfile:1.7-labs
+FROM maven:3.9.9-eclipse-temurin-23-alpine
+
+# Ensures the container is re-built if dependency files change
+ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="pom.xml"
+
+WORKDIR /app
+
+# .git & README.md are unique per-repository. We ignore them on first copy to prevent cache misses
+COPY --exclude=.git --exclude=README.md . /app
+
+# Install language-specific dependencies
+RUN .codecrafters/compile.sh
diff --git a/solutions/java/01-ry8/code/.codecrafters/compile.sh b/solutions/java/01-ry8/code/.codecrafters/compile.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to compile your program on CodeCrafters
+#
+# This runs before .codecrafters/run.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+mvn -B package -Ddir=/tmp/codecrafters-build-interpreter-java
diff --git a/solutions/java/01-ry8/code/.codecrafters/run.sh b/solutions/java/01-ry8/code/.codecrafters/run.sh
@@ -0,0 +1,11 @@
+#!/bin/sh
+#
+# This script is used to run your program on CodeCrafters
+#
+# This runs after .codecrafters/compile.sh
+#
+# Learn more: https://codecrafters.io/program-interface
+
+set -e # Exit on failure
+
+exec java -jar /tmp/codecrafters-build-interpreter-java/codecrafters-interpreter.jar "$@"
diff --git a/solutions/java/01-ry8/code/.gitattributes b/solutions/java/01-ry8/code/.gitattributes
@@ -0,0 +1 @@
+* text=auto
diff --git a/solutions/java/01-ry8/code/.gitignore b/solutions/java/01-ry8/code/.gitignore
@@ -0,0 +1,3 @@
+*.jar
+target/
+.idea/
diff --git a/solutions/java/01-ry8/code/README.md b/solutions/java/01-ry8/code/README.md
@@ -0,0 +1,50 @@
+![progress-banner](https://codecrafters.io/landing/images/default_progress_banners/interpreter.png)
+
+This is a starting point for Java solutions to the
+["Build your own Interpreter" Challenge](https://app.codecrafters.io/courses/interpreter/overview).
+
+This challenge follows the book
+[Crafting Interpreters](https://craftinginterpreters.com/) by Robert Nystrom.
+
+In this challenge you'll build an interpreter for
+[Lox](https://craftinginterpreters.com/the-lox-language.html), a simple
+scripting language. Along the way, you'll learn about tokenization, ASTs,
+tree-walk interpreters and more.
+
+Before starting this challenge, make sure you've read the "Welcome" part of the
+book that contains these chapters:
+
+- [Introduction](https://craftinginterpreters.com/introduction.html) (chapter 1)
+- [A Map of the Territory](https://craftinginterpreters.com/a-map-of-the-territory.html)
+  (chapter 2)
+- [The Lox Language](https://craftinginterpreters.com/the-lox-language.html)
+  (chapter 3)
+
+These chapters don't involve writing code, so they won't be covered in this
+challenge. This challenge will start from chapter 4,
+[Scanning](https://craftinginterpreters.com/scanning.html).
+
+**Note**: If you're viewing this repo on GitHub, head over to
+[codecrafters.io](https://codecrafters.io) to try the challenge.
+
+# Passing the first stage
+
+The entry point for your program is in `src/main/java/Main.java`. Study and
+uncomment the relevant code, and push your changes to pass the first stage:
+
+```sh
+git commit -am "pass 1st stage" # any msg
+git push origin master
+```
+
+Time to move on to the next stage!
+
+# Stage 2 & beyond
+
+Note: This section is for stages 2 and beyond.
+
+1. Ensure you have `mvn` installed locally
+2. Run `./your_program.sh` to run your program, which is implemented in
+   `src/main/java/Main.java`.
+3. Commit your changes and run `git push origin master` to submit your solution
+   to CodeCrafters. Test output will be streamed to your terminal.
diff --git a/solutions/java/01-ry8/code/codecrafters.yml b/solutions/java/01-ry8/code/codecrafters.yml
@@ -0,0 +1,11 @@
+# Set this to true if you want debug logs.
+#
+# These can be VERY verbose, so we suggest turning them off
+# unless you really need them.
+debug: false
+
+# Use this to change the Java version used to run your code
+# on Codecrafters.
+#
+# Available versions: java-23
+language_pack: java-23
diff --git a/solutions/java/01-ry8/code/pom.xml b/solutions/java/01-ry8/code/pom.xml
@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>io.codecrafters</groupId>
+    <artifactId>codecrafters-interpreter</artifactId>
+    <version>1.0</version>
+
+    <properties>
+        <maven.compiler.source>23</maven.compiler.source>
+        <maven.compiler.target>23</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>23</java.version>
+    </properties>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <configuration>
+                    <finalName>codecrafters-interpreter</finalName> <!-- Please do not change this final artifact name-->
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <appendAssemblyId>false</appendAssemblyId>
+                    <archive>
+                        <manifest>
+                            <addClasspath>true</addClasspath>
+                            <!-- This is the main class of your program which will be executed-->
+                            <mainClass>Main</mainClass>
+                        </manifest>
+                    </archive>
+                    <outputDirectory>${dir}</outputDirectory>
+                </configuration>
+
+                <executions>
+                    <execution>
+                        <id>make-assembly</id>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>