Round to Closest Half Integer and Remove Trailing .0

svg_pd_compress_chi.py

import re

def close_half_int(number):
    """Round a number to the closest half integer.
    >>> close_half_int(1.3)
    1.5
    >>> close_half_int(2.6)
    2.5
    >>> close_half_int(3.0)
    3.0
    >>> close_half_int(4.1)
    4.0"""
    return round(number * 2) / 2


COMMANDS = set('MmZzLlHhVvCcSsQqTtAa')
COMMAND_RE = re.compile("([MmZzLlHhVvCcSsQqTtAa])")
FLOAT_RE = re.compile("[-+]?[0-9]*\.?[0-9]+(?:[eE][-+]?[0-9]+)?")

def tokenize_path(pathdef):
   
    flt = []
    end = False
    for x in COMMAND_RE.split(pathdef):
        if x in COMMANDS:
            flt = [x]
            if x == "z":
                end = True
        else:
            tks = []
            for token in FLOAT_RE.findall(x):
                tks.append(token)
            if not end:
                flt.append(tks)
            if flt != [[]]:
                yield flt

def round_tk_path(tks):

    ptk = tks
    new_l = []

    for x in ptk:
        cmd = x[0]
        if cmd!="z":
            num = x[1]
            nums = []
            for y in num:
                
                nums.append( str(f'{ close_half_int( float(y) ):g}') )

            new_l.append([cmd, nums])

    new_l.append(["z"])
    return new_l


def join_tk_path(tks):

    tostr = ''

    for x in tks:
        cmd = x[0]
        tostr += cmd
        if cmd!="z":
            num = x[1]
            tostr += ','.join(num)
    
    if_neg_nocomma = tostr.replace(",-", "-")
    return if_neg_nocomma

path_d = "M13,9.5H9.7C9.3,9.5,9,9.3,9,8.9c0-0.4,0.3-0.6,0.6-0.6h2.9l0.5,0.5h3l2.4-2.4l-3.7-3.7H9.1c-3.2,0-5.8,2.5-5.8,5.7S5.9,14,9.1,14h3.4c0.3,0,0.6,0.2,0.6,0.6c0,0.4-0.3,0.6-0.6,0.6H8.6l-0.5-0.5h-3l-2.4,2.4l3.7,3.7h6.7c3.2,0,5.8-2.5,5.8-5.7C18.9,12,16.2,9.5,13,9.5z"

tkp = list(tokenize_path(path_d))
rtk = round_tk_path(tkp)

print(join_tk_path(rtk))

# original
# M13,9.5H9.7C9.3,9.5,9,9.3,9,8.9c0-0.4,0.3-0.6,0.6-0.6h2.9l0.5,0.5h3l2.4-2.4l-3.7-3.7H9.1 c-3.2,0-5.8,2.5-5.8,5.7S5.9,14,9.1,14h3.4c0.3,0,0.6,0.2,0.6,0.6c0,0.4-0.3,0.6-0.6,0.6H8.6l-0.5-0.5h-3l-2.4,2.4l3.7,3.7h6.7 c3.2,0,5.8-2.5,5.8-5.7C18.9,12,16.2,9.5,13,9.5z
# result
# M13,9.5H9.5C9.5,9.5,9,9.5,9,9c0,-0.5,0.5,-0.5,0.5,-0.5h3l0.5,0.5h3l2.5,-2.5l-3.5,-3.5H9c-3,0,-6,2.5,-6,5.5S6,14,9,14h3.5c0.5,0,0.5,0,0.5,0.5c0,0.5,-0.5,0.5,-0.5,0.5H8.5l-0.5,-0.5h-3l-2.5,2.5l3.5,3.5h6.5c3,0,6,-2.5,6,-5.5C19,12,16,9.5,13,9.5z