def _until_demo():
"""
demonstrate the until function
"""
print("get until what?")
char = pmlr._read_keypress()
pmlr._writer(char + "\n")
y = pmlr.until(char)
print("\n" + y)
def _can_you_vote():
"""
a practical example:
test if a user can vote based purely on keypresses
"""
pmlr._writer("can you vote? age : ")
x = int("0" + pmlr.ignore_not("0123456789", "0123456789", end_cond=True, count=2))
if not x:
print("\nsorry, age can only consist of digits.")
return
print(
"\nyour age is", x, "\nYou can vote!"
if x >= 18
else "Sorry! you can't vote"
)
def _forth_syntax_test():
"""
in the programming language Forth,
`function` definitons start at the beginning of a line with a `:` colon
and go until the next semicolon.
this is an example of how this module can be used
in a Forth REPL to compile statements specially;
it's implemented in catb0t/microcat as well.
"""
pmlr._writer("demo FORTH repl \n> ")
firstchar = pmlr._read_keypress()
pmlr._writer(firstchar)
if firstchar != ":":
print("\nreturned because first char wasn't ':'")
return
defn = firstchar + pmlr.until(";") + ";"
pmlr._writer("\nrepl got:\n" + defn + "\n")
def _get_paragraphs():
from string import printable as ALLOWED_CHARS
print("\nPress CTRL-C or CTRL-D to stop reading.")
textwriterCommand = pmlr.until_not(ALLOWED_CHARS, count=500, raw=True)
pmlr._writer("\n\n")
return pmlr._writer("you typed:" + textwriterCommand)
