 |
Reply From: | Xrayez |
You can create scripts dynamically. I scratched my head a bit and figured this silly example, but should give you an idea:
extends Node2D
var variable = 0
func _ready():
var expression = "variable += 1"
var result = execute(expression)
print(result) # should print 1
func execute(p_expression):
assert(typeof(p_expression) == TYPE_STRING)
# Create a new script with embedded expression
var script = GDScript.new()
# Define source code needed for evaluation (extends Reference by default)
script.source_code += \
"""
var variable = %s
func eval():
%s
return variable
""" \
% [variable, p_expression]
# ^ use format string to substitute variables in a script
# Should reload the script with changed source code
script.reload()
# Need to create an instance of the script to call its methods
var instance = Reference.new()
instance.set_script(script)
# Evaluate expression here
var result = instance.call("eval")
return result
Another thing you would do it is to write a custom GDScript parser in GDScript to evalulate strings on the fly!
EDIT: flurick’s answers your question by using a specialized Expression class.