The Story - FAC

FFHS, FAC (Formale Sprachen, Automaten und Compilerbau), Semesterarbeit

Quick Start

Run this command ./gradlew build (JDK 15) for build and execute test.

Requirement

• JDK 15

Start Interpreter

Run this command ./gradlew runStory. This command will interpret (valid) code that is written in the following describe programming language.

Example program is stored under programs/hugo.

# Execute program:
./gradlew runStory -DfilePath="<PATH_TO_THIS_PROJECT>/programs/hugo"

Language

Datatype

• String Literal
• Number
• Boolean

Variable

A variable can be set one of the following ways:

Let x be 1
Put 1 into x
Now x will be 1

A variable ...

• ... has no fix datatype.
• ... can have the following prefix: a, an, the, my and your
• ... can also be a name like Black Pearl.
• ... is case-insensitiv. (my dog = My dog)

Mathematics

operator	keywords
+	plus/with
-	minus/without
*	times/of
/	over

Condition

operator	keywords
>	is higher/greater/bigger/stronger than
<	is lower/less/smaller/weaker than
>=	is as high/great/big/strong as
<=	is as low/little/small/weak as
==	is exactly the same as
!=	is not the same as

Conditionals

Conditional expressions start with the If (if) keyword, followed by a condition or a boolean value. An Else (else) block can be written directly after an If block. The code block of a If or If-Else ends by a blank line.

Number and String Literal will evaluate as false!

Loops

Loop expression start with the While (while) keyword, followed by a condition or a boolean value. The code block ends by a blank line.

Function

Functions are declared with a variable name followed by the takes keyword and a list of arguments separated by one of the following: and or ,. The code block of a function ends by a blank line. Functions are called using the taking keyword and must have at least one argument. Multiple arguments are separated with one of the following: and or ,.

The last statement of a function will be also a return value.

Square takes X
X times X

Square taking 4

Print

The following keywords can be used to write variables or values into the console.

Say "Hello, World!"
Shout 42
Put 3.13 into pi
Print pi