LineUp

LineUp is a pseudo-code interpreter that allows you to write and run a code with a limited action set by the language.

The language is designed to be simple and easy to modify, and add actions to it. But it will be a little complex to write a code with it.

Installation

pip install lineup-lang

from lineup_lang import Language, luexec, lucore

Usage

# Create a new language
# Add here the default actions that your language will have
core_object = [lucore.Variables({"a": 0, "b": -1})]

# You need an executor to run the code, it's the object that will iterate over the code
# Default executor, it will run the code line by line
executor = luexec.DefaultExecutor(core_object)
# Jumper executor, it will run the code line by line, but it will also allow you to jump to a specific line
executor = luexec.JumperExecutor(core_object)

# Create the language object, it's the object that will read the code, split it and send it to the executor
language = Language(executor)

# Run the code
language.run('''
    VAR c USE VAR a GET
    IF *+2 VAR c GET
    ELSE *+2
    EXIT VAR a GET
    EXIT VAR b GET
''')

Default core objects

• Variables: It's a object that will store variables and their values. It's a dictionary that will store the variables and their values.

  • Variables({"a": 0, "b": -1}): It will create a new object with the variables a and b with the values 0 and -1 respectively.
  • VAR x: Execute an action on a variable.
    • GET: Get the value of a variable.
    • SET y: Set the value "y" of a variable.
    • COPY y: Copy the value of the variable y to the variable.
    • USE ACTION : Execute a core action and store the result in the variable x.
    • EXEC ACTION : Execute an action on a variable. The variable need to be a LanguageObject.
    • ACTION : Execute an action on a variable. The variable need to be a LanguageObject.

• ConditionsJumpObject: An object that will store the conditions and the lines to jump.

  • IF x CONDITION: If the condition is true, go to the line x, else go to the next line.
  • ELSE JUMP x: Go to the line x.
  • NOTIF x CONDITION: If the condition is false, go to the line x, else go to the next line.
  • Condition:
    • ACTION Execute a core action, if the result is true, the condition is true.
    • "ACTION" SIGN "ACTION": Compare two actions with the sign.
    • SIGN:
      • Equal: EQ, ==
      • Not equal: NE, !=
      • Greater: GT, >
      • Greater or equal: GE, >=
      • Less: LT, <
      • Less or equal: LE, <=