# -*- coding: utf-8 -*-
# Copyright (C) 2016-2023 PyThaiNLP Project
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""
Functions related to keyboard layout.
"""
EN_TH_KEYB_PAIRS = {
"Z": "(",
"z": "ผ",
"X": ")",
"x": "ป",
"C": "ฉ",
"c": "แ",
"V": "ฮ",
"v": "อ",
"B": "\u0e3a", # พินทุ
"b": "\u0e34", # สระอุ
"N": "\u0e4c", # การันต์
"n": "\u0e37", # สระอือ
"M": "?",
"m": "ท",
"<": "ฒ",
",": "ม",
">": "ฬ",
".": "ใ",
"?": "ฦ",
"/": "ฝ",
"A": "ฤ",
"a": "ฟ",
"S": "ฆ",
"s": "ห",
"D": "ฏ",
"d": "ก",
"F": "โ",
"f": "ด",
"G": "ฌ",
"g": "เ",
"H": "\u0e47", # ไม้ไต่คู้
"h": "\u0e49", # ไม้โท
"J": "\u0e4b", # ไม้จัตวา
"j": "\u0e48", # ไม้เอก
"K": "ษ",
"k": "า",
"L": "ศ",
"l": "ส",
":": "ซ",
";": "ว",
'"': ".",
"'": "ง",
"Q": "๐",
"q": "ๆ",
"W": '"',
"w": "ไ",
"E": "ฎ",
"e": "\u0e33", # สระอำ
"R": "ฑ",
"r": "พ",
"T": "ธ",
"t": "ะ",
"Y": "\u0e4d", # นิคหิต
"y": "\u0e31", # ไม้หันอากาศ
"U": "\u0e4a", # ไม้ตรี
"u": "\u0e35", # สระอ ี
"I": "ณ",
"i": "ร",
"O": "ฯ",
"o": "น",
"P": "ญ",
"p": "ย",
"{": "ฐ",
"[": "บ",
"}": ",",
"]": "ล",
"|": "ฅ",
"\\": "ฃ",
"~": "%",
"`": "_",
"@": "๑",
"2": "/",
"#": "๒",
"3": "-",
"$": "๓",
"4": "ภ",
"%": "๔",
"5": "ถ",
"^": "\u0e39", # สระอู
"6": "\u0e38", # สระอุ
"&": "฿",
"7": "\u0e36", # สระอึ
"*": "๕",
"8": "ค",
"(": "๖",
"9": "ต",
")": "๗",
"0": "จ",
"_": "๘",
"-": "ข",
"+": "๙",
"=": "ช",
}
TH_EN_KEYB_PAIRS = {v: k for k, v in EN_TH_KEYB_PAIRS.items()}
EN_TH_TRANSLATE_TABLE = str.maketrans(EN_TH_KEYB_PAIRS)
TH_EN_TRANSLATE_TABLE = str.maketrans(TH_EN_KEYB_PAIRS)
TIS_820_2531_MOD = [
["-", "ๅ", "/", "", "_", "ภ", "ถ", "ุ", "ึ", "ค", "ต", "จ", "ข", "ช"],
["ๆ", "ไ", "ำ", "พ", "ะ", "ั", "ี", "ร", "น", "ย", "บ", "ล", "ฃ"],
["ฟ", "ห", "ก", "ด", "เ", "้", "่", "า", "ส", "ว", "ง"],
["ผ", "ป", "แ", "อ", "ิ", "ื", "ท", "ม", "ใ", "ฝ"],
]
TIS_820_2531_MOD_SHIFT = [
["%", "+", "๑", "๒", "๓", "๔", "ู", "฿", "๕", "๖", "๗", "๘", "๙"],
["๐", '"', "ฎ", "ฑ", "ธ", "ํ", "๊", "ณ", "ฯ", "ญ", "ฐ", ",", "ฅ"],
["ฤ", "ฆ", "ฏ", "โ", "ฌ", "็", "๋", "ษ", "ศ", "ซ", "."],
["(", ")", "ฉ", "ฮ", "ฺ", "์", "?", "ฒ", "ฬ", "ฦ"],
]
[docs]def eng_to_thai(text: str) -> str:
"""
Corrects the given text that was incorrectly typed using English-US
Qwerty keyboard layout to the originally intended keyboard layout
that is the Thai Kedmanee keyboard.
:param str text: incorrect text input (type Thai with English keyboard)
:return: Thai text where incorrect typing with
a keyboard layout is corrected
:rtype: str
:Example:
Intentionally type "ธนาคารแห่งประเทศไทย", but got "Tok8kicsj'xitgmLwmp"::
from pythainlp.util import eng_to_thai
eng_to_thai("Tok8kicsj'xitgmLwmp")
# output: ธนาคารแห่งประเทศไทย
"""
return text.translate(EN_TH_TRANSLATE_TABLE)
[docs]def thai_to_eng(text: str) -> str:
"""
Corrects the given text that was incorrectly typed using Thai Kedmanee
keyboard layout to the originally intended keyboard layout
that is the English-US Qwerty keyboard.
:param str text: incorrect text input (type English with Thai keyboard)
:return: English text where incorrect typing with
a keyboard layout is corrected
:rtype: str
:Example:
Intentionally type "Bank of Thailand", but got "ฺฟืา นด ธ้ฟรสฟืก"::
from pythainlp.util import eng_to_thai
thai_to_eng("ฺฟืา นด ธ้ฟรสฟืก")
# output: 'Bank of Thailand'
"""
return text.translate(TH_EN_TRANSLATE_TABLE)
def thai_keyboard_dist(c1: str, c2: str, shift_dist: float = 0.0) -> float:
"""
Calculate euclidean distance between two Thai characters
according to their location on a Thai keyboard layout.
A modified TIS 820-2531 standard keyboard layout, which is developed
from Kedmanee layout and is the most commonly used Thai keyboard layout,
is used in distance calculation.
The modified TIS 820-2531 is TIS 820-2531 with few key extensions
proposed in TIS 820-2536 draft. See Figure 4, notice grey keys, in
https://www.nectec.or.th/it-standards/keyboard_layout/thai-key.html
Noted that the latest TIS 820-2538 has slight changes in layout from
TIS 820-2531. See Figure 2, notice the Thai Baht sign and ฅ-ฃ pair, in
https://www.nectec.or.th/it-standards/std820/std820.html
Since TIS 820-2538 is not widely adopted by keyboard manufacturer,
this function uses the de facto standard modified TIS 820-2531 instead.
:param str c1: first character
:param str c2: second character
:param str shift_dist: return value if they're shifted
:return: euclidean distance between two characters
:rtype: float
:Example:
from pythainlp.util import thai_keyboard_dist
thai_keyboard_dist("ด", "ะ")
# output: 1.4142135623730951
thai_keyboard_dist("ฟ", "ฤ")
# output: 0.0
thai_keyboard_dist("ฟ", "ห")
# output: 1.0
thai_keyboard_dist("ฟ", "ก")
# output: 2.0
thai_keyboard_dist("ฟ", "ฤ", 0.5)
# output: 0.5
"""
def get_char_coord(
ch: str, layouts=[TIS_820_2531_MOD, TIS_820_2531_MOD_SHIFT]
):
for layout in layouts:
for row in layout:
if ch in row:
r = layout.index(row)
c = row.index(ch)
return (r, c)
raise ValueError(ch + " not found in given keyboard layout")
coord1 = get_char_coord(c1)
coord2 = get_char_coord(c2)
distance = (
(coord1[0] - coord2[0]) ** 2 + (coord1[1] - coord2[1]) ** 2
) ** (0.5)
if distance == 0 and c1 != c2:
return shift_dist
return distance