generate_emoji_placeholders.py

from __future__ import print_function
import os
from os import path
import subprocess

OUTPUT_DIR = "/tmp/placeholder_emoji"


def generate_image(name, text):
    print(name, text.replace("\n", "_"))
    subprocess.check_call(
        ["convert", "-size", "100x100", "label:%s" % text, "%s/%s" % (OUTPUT_DIR, name)]
    )


def is_color_patch(cp):
    return cp >= 0x1F3FB and cp <= 0x1F3FF


def has_color_patch(values):
    for v in values:
        if is_color_patch(v):
            return True
    return False


def regional_to_ascii(cp):
    return unichr(ord("A") + cp - 0x1F1E6)


def is_flag_sequence(values):
    if len(values) != 2:
        return False
    for v in values:
        v -= 0x1F1E6
        if v < 0 or v > 25:
            return False
    return True


def is_keycap_sequence(values):
    return len(values) == 2 and values[1] == 0x20E3


def get_keycap_text(values):
    return "-%c-" % unichr(values[0])  # convert gags on '['


char_map = {
    0x1F468: "M",
    0x1F469: "W",
    0x1F466: "B",
    0x1F467: "G",
    0x2764: "H",  # heavy black heart, no var sel
    0x1F48B: "K",  # kiss mark
    0x200D: "-",  # zwj placeholder
    0xFE0F: "-",  # variation selector placeholder
    0x1F441: "I",  # Eye
    0x1F5E8: "W",  # 'witness' (left speech bubble)
}


def get_combining_text(values):
    chars = []
    for v in values:
        char = char_map.get(v, None)
        if not char:
            return None
        if char != "-":
            chars.append(char)
    return "".join(chars)


if not path.isdir(OUTPUT_DIR):
    os.makedirs(OUTPUT_DIR)

with open("sequences.txt", "r") as f:
    for seq in f:
        seq = seq.strip()
        text = None
        values = [int(code, 16) for code in seq.split("_")]
        if len(values) == 1:
            val = values[0]
            text = "%04X" % val  # ensure upper case format
        elif is_flag_sequence(values):
            text = "".join(regional_to_ascii(cp) for cp in values)
        elif has_color_patch(values):
            print("skipping color patch sequence %s" % seq)
        elif is_keycap_sequence(values):
            text = get_keycap_text(values)
        else:
            text = get_combining_text(values)
            if not text:
                print("missing %s" % seq)

        if text:
            if len(text) > 3:
                if len(text) == 4:
                    hi = text[:2]
                    lo = text[2:]
                else:
                    hi = text[:-3]
                    lo = text[-3:]
                text = "%s\n%s" % (hi, lo)
            generate_image("emoji_u%s.png" % seq, text)