Installation and your first program

The NeoObjectPascal interpreter is distributed as an executable JAR file, so all you need is Java 11 or later installed.

Prerequisites

• Java 11+ (JRE or JDK). Check with:

java -version

• (Optional) Maven, if you want to build the interpreter from source.

Getting the interpreter

You can use the pre-packaged JAR (for example, the one that ships with the VS Code extension, in VS-Code-Extension/bin/) or build it from the repository:

cd NeoObjectPascal
mvn package -DskipTests
# The final JAR is in target/neoobjectpascal-1.0-SNAPSHOT-jar-with-dependencies.jar

Hello, world

Create a file named ola.npas:

begin
    WriteLn("Olá, NeoObjectPascal!");
end.

And run it:

java -jar neoobjectpascal.jar ola.npas

Saída

 Olá, NeoObjectPascal! 

File extension

Programs use the .npas extension. Test files use .test.npas.

Command-line options

The interpreter accepts several flags:

Flag	Description
(none)	Runs the .npas file
-q, --no-warnings	Suppresses analysis warnings
-t, --test	Test mode (runs a .test.npas)
-ta, --test-all <dir>	Runs all tests recursively, with coverage
-d, --debug	Interactive debugger mode
--dap	DAP mode (VS Code integration)
--build <file> [--icon png] [--name] [--output] [--target]	Builds a native executable (exe/app/bin)
--execute-on-cloud <url> <proj> <user> <pass>	Runs on NeoObjectPascalCloud
-h, --help	Shows help

Examples:

java -jar neoobjectpascal.jar --no-warnings ola.npas
java -jar neoobjectpascal.jar -t calculadora.test.npas
java -jar neoobjectpascal.jar --test-all ./examples

Recommended editor

Install the VS Code extension for NeoObjectPascal and get syntax highlighting, execution, testing, and debugging all integrated. See Debugger, VS Code, and cloud.

Now that you can run code, let's understand the structure of a program.