Embedding JavaScript into Python

output.txt

/usr/bin/python3.5 /home/martin/PycharmProjects/JavaScript/miniracer_test1.py
2
89
:-)
Timed out!

Process finished with exit code 0

poznamka.txt

Kdysi jsem delal neco podobneho v Jave: http://pastebin.com/e86AGMau

python_embed_JavaScript.py

# https://blog.sqreen.io/embedding-javascript-into-python/
# http://stackoverflow.com/a/366763/1974494
# http://stackoverflow.com/a/601168/1974494

import signal
from contextlib import contextmanager
from py_mini_racer import py_mini_racer

ctx = py_mini_racer.MiniRacer()

# ---------------------

print( ctx.eval('1+1') )

# ---------------------

my_script_1 = """
function maxNumber(arr) {
    var largest = arr[0];
    for (var i = 0; i < arr.length; i++) {
        if (largest < arr[i] ) {
            largest = arr[i];
        }
    }
    return largest;
}
"""
ctx.eval(my_script_1)

arr = [3, 6, 2, 56, 32, 5, 89, 32]
max = ctx.call("maxNumber", arr)
print(max)

# ---------------------

my_script_2 = """
function sleep(delay) {
    var start = new Date().getTime();
    while (new Date().getTime() < start + (delay * 1000));
    return ":-)";
}
"""

ctx.eval(my_script_2)

class TimeoutException(Exception): pass

@contextmanager
def time_limit(seconds):
    def signal_handler(signum, frame):
        raise TimeoutException("Timed out!")
    signal.signal(signal.SIGALRM, signal_handler)
    signal.alarm(seconds)
    try:
        yield
    finally:
        signal.alarm(0)

try:
    with time_limit(5):
        result = ctx.call("sleep", 3)
        print(result)
except TimeoutException as msg:
    print("Timed out!")

try:
    with time_limit(5):
        result = ctx.call("sleep", 7)
        print(result)
except TimeoutException as msg:
    print("Timed out!")

# ---------------------