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May 13, 2019 18:10
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Generate morse code from text.
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const morse_code = { | |
'a': '.-', | |
'b': '-...', | |
'c': '-.-.', | |
'd': '-..', | |
'e': '.', | |
'f': '..-.', | |
'g': '--.', | |
'h': '....', | |
'i': '..', | |
'j': '.---', | |
'k': '-.-', | |
'l': '.-..', | |
'm': '--', | |
'n': '-.', | |
'o': '---', | |
'p': '.--.', | |
'q': '--.-', | |
'r': '.-.', | |
's': '...', | |
't': '-', | |
'u': '..-', | |
'v': '...-', | |
'w': '.--', | |
'x': '-..-', | |
'y': '-.--', | |
'z': '--..', | |
'1': '.----', | |
'2': '..---', | |
'3': '...--', | |
'4': '....-', | |
'5': '.....', | |
'6': '-....', | |
'7': '--...', | |
'8': '---..', | |
'9': '----.', | |
'0': '-----', | |
'.': '.-.-.-', | |
',': '--..--', | |
'?': '..--..', | |
"'": '.----.', | |
'!': '-.-.--', | |
'/': '-..-.', | |
'(': '-.--.', | |
')': '-.--.-', | |
'&': '.-...', | |
':': '---...', | |
';': '-.-.-.', | |
'=': '-...-', | |
'+': '.-.-.', | |
'-': '-....-', | |
'_': '..--.-', | |
'"': '.-..-.', | |
'$': '...-..-', | |
'@': '.--.-.' | |
}; | |
function char_to_pattern(char) { | |
const pattern = []; | |
const code = morse_code[char].split(''); | |
for (i = 0; i < code.length; i++) { | |
if (code[i] === '.') { | |
pattern.push(1); | |
} else if (code[i] == '-') { | |
pattern.push(3); | |
} | |
if (i < code.length - 1) { | |
pattern.push(1); | |
} | |
} | |
return pattern; | |
} | |
function str_to_pattern(str) { | |
let pattern = []; | |
for (let i = 0; i < str.length; i++) { | |
const c = str.charAt(i); | |
const next_c = str.charAt(i + 1); | |
if (c.trim().length === 0) { // skip whitespace | |
continue; | |
} | |
pattern = pattern.concat(char_to_pattern(c)); | |
if (next_c.trim().length === 0) { | |
pattern.push(7); | |
} else { | |
pattern.push(3); | |
} | |
} | |
return pattern; | |
} | |
// Explanation for 1200 / wpm | |
// https://en.wikipedia.org/wiki/Morse_code#Speed_in_words_per_minute | |
function pattern_to_timings(pattern, wpm) { | |
return pattern.map(i => (i * (1200 / wpm)).toString()).join(','); | |
} | |
const replacements = [ | |
[/</g, ' LT '], | |
[/>/g, ' GT '], | |
[/\*/g, ' star '], | |
[/#/g, ' hash '] | |
]; | |
function cleanup(str) { | |
str = str | |
.toLowerCase() | |
.normalize('NFD') | |
.replace(/[\u0300-\u036f]/g, ''); | |
for (let i = 0; i < replacements.length; i++) { | |
str = str.replace(replacements[i][0], replacements[i][1]); | |
} | |
str = str.replace(/\s+/g, ' '); | |
return str; | |
} | |
function morse(str, wpm) { | |
return '0,' + pattern_to_timings( | |
str_to_pattern(cleanup(str)), | |
wpm | |
); | |
} | |
vibratePattern(morse(text, 15)); |
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