print ('<h2>🐍 RapydScript ' + parent.RapydScript.rs_version + '</h2>', end='')
print ('Javascript Programming in Python Activity <i>(Jappy)</i>')
print ('<hr>', end='')

callcount = 1
callhistory = []
backscroll = 1

# Read
editbox = inputAsync(interpret)
editbox.addEventListener("keyup", scrollback) 
def scrollback(e):
    global backscroll, callcount
    if e.keyCode == 38: # Up arrow
        if backscroll < callcount:
            backscroll = backscroll + 1
            editbox.value = callhistory[callcount-backscroll]
    elif e.keyCode == 40: # Down arrow
        if backscroll > 1:
            backscroll = backscroll - 1
            editbox.value = callhistory[callcount-backscroll-1]

# Evaluate
def interpret(line):
    if not line:
        return False
    global callcount
    print (line)
    try:
        callhistory.push(line)
        line = parent.compile(line)
        result = window.eval(line)
        if result is not undefined:
            printout(result)
    except Exception as e:
        print (e)
    callcount = callcount + 1
    printin()
    editbox.value = ''
    return False

# Print
def printout(result):
    print ('Out[' + callcount + ']: '  + result)

def printin():
    print ('<br><b>In [' + callcount + '] ⏩ </b>', end='')
printin()