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7a08b1dc3e
* Use parent xo config in app/ * lint: Fix xo 0.17 errors * app: add missing semver dependency
79 lines
1.3 KiB
JavaScript
79 lines
1.3 KiB
JavaScript
/**
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* Keyboard event keyCodes have proven to be really unreliable.
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* This util function will cover most of the edge cases where
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* String.fromCharCode() doesn't work.
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*/
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const _toAscii = {
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188: '44',
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109: '45',
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190: '46',
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191: '47',
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192: '96',
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220: '92',
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222: '39',
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221: '93',
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219: '91',
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173: '45',
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187: '61', // IE Key codes
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186: '59', // IE Key codes
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189: '45' // IE Key codes
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};
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const _shiftUps = {
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96: '~',
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49: '!',
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50: '@',
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51: '#',
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52: '$',
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53: '%',
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54: '^',
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55: '&',
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56: '*',
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57: '(',
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48: ')',
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45: '_',
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61: '+',
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91: '{',
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93: '}',
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92: '|',
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59: ':',
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39: '\'',
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44: '<',
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46: '>',
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47: '?'
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};
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const _arrowKeys = {
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38: '[A',
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40: '[B',
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39: '[C',
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37: '[D'
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};
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/**
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* This fn takes a keyboard event and returns
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* the character that was pressed. This fn
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* purposely doesn't take into account if the alt/meta
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* key was pressed.
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*/
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export default function fromCharCode(e) {
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let code = String(e.which);
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if ({}.hasOwnProperty.call(_arrowKeys, code)) {
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return _arrowKeys[code];
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}
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if ({}.hasOwnProperty.call(_toAscii, code)) {
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code = _toAscii[code];
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}
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const char = String.fromCharCode(code);
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if (e.shiftKey) {
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if ({}.hasOwnProperty.call(_shiftUps, code)) {
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return _shiftUps[code];
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}
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return char.toUpperCase();
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}
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return char.toLowerCase();
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}
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