|
| 1 | +import camelCase from 'camelcase' |
| 2 | +import syntaxJsx from '@babel/plugin-syntax-jsx' |
| 3 | + |
| 4 | +const cachedCamelCase = (() => { |
| 5 | + const cache = Object.create(null) |
| 6 | + return string => { |
| 7 | + if (!cache[string]) { |
| 8 | + cache[string] = camelCase(string) |
| 9 | + } |
| 10 | + |
| 11 | + return cache[string] |
| 12 | + } |
| 13 | +})() |
| 14 | +const equalCamel = (string, match) => string === match || string === cachedCamelCase(match) |
| 15 | + |
| 16 | +const keyModifiers = ['ctrl', 'shift', 'alt', 'meta'] |
| 17 | +const keyCodes = { |
| 18 | + esc: 27, |
| 19 | + tab: 9, |
| 20 | + enter: 13, |
| 21 | + space: 32, |
| 22 | + up: 38, |
| 23 | + left: 37, |
| 24 | + right: 39, |
| 25 | + down: 40, |
| 26 | + delete: [8, 46], |
| 27 | +} |
| 28 | +// KeyboardEvent.key aliases |
| 29 | +const keyNames = { |
| 30 | + // #7880: IE11 and Edge use `Esc` for Escape key name. |
| 31 | + esc: ['Esc', 'Escape'], |
| 32 | + tab: 'Tab', |
| 33 | + enter: 'Enter', |
| 34 | + space: ' ', |
| 35 | + // #7806: IE11 uses key names without `Arrow` prefix for arrow keys. |
| 36 | + up: ['Up', 'ArrowUp'], |
| 37 | + left: ['Left', 'ArrowLeft'], |
| 38 | + right: ['Right', 'ArrowRight'], |
| 39 | + down: ['Down', 'ArrowDown'], |
| 40 | + delete: ['Backspace', 'Delete'], |
| 41 | +} |
| 42 | + |
| 43 | +export default function(babel) { |
| 44 | + const t = babel.types |
| 45 | + |
| 46 | + function genGuard(expression) { |
| 47 | + return t.ifStatement(expression, t.returnStatement(t.nullLiteral())) |
| 48 | + } |
| 49 | + |
| 50 | + function genCallExpression(expression, args = []) { |
| 51 | + return t.callExpression(expression, args) |
| 52 | + } |
| 53 | + |
| 54 | + function genEventExpression(name) { |
| 55 | + return t.memberExpression(t.identifier('$event'), t.identifier(name)) |
| 56 | + } |
| 57 | + |
| 58 | + function not(expression) { |
| 59 | + return t.unaryExpression('!', expression) |
| 60 | + } |
| 61 | + |
| 62 | + function notEq(left, right) { |
| 63 | + return t.binaryExpression('!==', left, right) |
| 64 | + } |
| 65 | + |
| 66 | + function and(left, right) { |
| 67 | + return t.logicalExpression('&&', left, right) |
| 68 | + } |
| 69 | + |
| 70 | + function or(left, right) { |
| 71 | + return t.logicalExpression('||', left, right) |
| 72 | + } |
| 73 | + |
| 74 | + function hasButton() { |
| 75 | + return t.binaryExpression('in', t.stringLiteral('button'), t.identifier('$event')) |
| 76 | + } |
| 77 | + |
| 78 | + const modifierCode = { |
| 79 | + // stop: '$event.stopPropagation();', |
| 80 | + stop: () => genCallExpression(genEventExpression('stopPropagation')), |
| 81 | + // prevent: '$event.preventDefault();', |
| 82 | + prevent: () => genCallExpression(genEventExpression('preventDefault')), |
| 83 | + // self: genGuard(`$event.target !== $event.currentTarget`), |
| 84 | + self: () => genGuard(notEq(genEventExpression('target'), genEventExpression('currentTarget'))), |
| 85 | + // ctrl: genGuard(`!$event.ctrlKey`), |
| 86 | + ctrl: () => genGuard(not(genEventExpression('ctrlKey'))), |
| 87 | + // shift: genGuard(`!$event.shiftKey`), |
| 88 | + shift: () => genGuard(not(genEventExpression('shiftKey'))), |
| 89 | + // alt: genGuard(`!$event.altKey`), |
| 90 | + alt: () => genGuard(not(genEventExpression('altKey'))), |
| 91 | + // meta: genGuard(`!$event.metaKey`), |
| 92 | + meta: () => genGuard(not(genEventExpression('metaKey'))), |
| 93 | + // left: genGuard(`'button' in $event && $event.button !== 0`), |
| 94 | + left: () => genGuard(and(hasButton(), notEq(genEventExpression('button'), t.numericLiteral(0)))), |
| 95 | + // middle: genGuard(`'button' in $event && $event.button !== 1`), |
| 96 | + middle: () => genGuard(and(hasButton(), notEq(genEventExpression('button'), t.numericLiteral(1)))), |
| 97 | + // right: genGuard(`'button' in $event && $event.button !== 2`) |
| 98 | + right: () => genGuard(and(hasButton(), notEq(genEventExpression('button'), t.numericLiteral(2)))), |
| 99 | + } |
| 100 | + |
| 101 | + function genHandlerFunction(body) { |
| 102 | + return t.arrowFunctionExpression([t.identifier('$event')], t.blockStatement(body instanceof Array ? body : [body])) |
| 103 | + } |
| 104 | + |
| 105 | + /** |
| 106 | + * @param {Path<JSXAttribute>} handlerPath |
| 107 | + */ |
| 108 | + function parse(handlerPath) { |
| 109 | + const namePath = handlerPath.get('name') |
| 110 | + let name = t.isJSXNamespacedName(namePath) |
| 111 | + ? `${namePath.get('namespace.name').node}:${namePath.get('name.name').node}` |
| 112 | + : namePath.get('name').node |
| 113 | + |
| 114 | + const normalizedName = camelCase(name) |
| 115 | + |
| 116 | + let modifiers |
| 117 | + let argument |
| 118 | + ;[name, ...modifiers] = name.split('_') |
| 119 | + ;[name, argument] = name.split(':') |
| 120 | + |
| 121 | + if (!equalCamel(name, 'v-on') || !argument) { |
| 122 | + return { |
| 123 | + isInvalid: false, |
| 124 | + } |
| 125 | + } |
| 126 | + |
| 127 | + if (!t.isJSXExpressionContainer(handlerPath.get('value'))) { |
| 128 | + throw new Error('Only expression container is allowed on v-on directive.') |
| 129 | + } |
| 130 | + |
| 131 | + const expressionPath = handlerPath.get('value.expression') |
| 132 | + |
| 133 | + return { |
| 134 | + expression: expressionPath.node, |
| 135 | + modifiers, |
| 136 | + event: argument, |
| 137 | + } |
| 138 | + } |
| 139 | + |
| 140 | + /** |
| 141 | + * @param {Path<JSXAttribute>} handlerPath |
| 142 | + */ |
| 143 | + function genHandler(handlerPath) { |
| 144 | + let { modifiers, isInvalid, expression, event } = parse(handlerPath) |
| 145 | + let isNative = false |
| 146 | + |
| 147 | + if (isInvalid) return |
| 148 | + |
| 149 | + if (!modifiers || modifiers.length === 0) { |
| 150 | + return { |
| 151 | + event, |
| 152 | + expression, |
| 153 | + isNative, |
| 154 | + } |
| 155 | + } |
| 156 | + |
| 157 | + const code = [] |
| 158 | + const genModifierCode = [] |
| 159 | + const keys = [] |
| 160 | + |
| 161 | + for (const key of modifiers) { |
| 162 | + if (modifierCode[key]) { |
| 163 | + const modifierStatement = modifierCode[key]() |
| 164 | + genModifierCode.push( |
| 165 | + t.isExpression(modifierStatement) ? t.expressionStatement(modifierStatement) : modifierStatement, |
| 166 | + ) |
| 167 | + if (keyCodes[key]) { |
| 168 | + keys.push(key) |
| 169 | + } |
| 170 | + } else if (key === 'exact') { |
| 171 | + genModifierCode.push( |
| 172 | + genGuard( |
| 173 | + keyModifiers |
| 174 | + .filter(keyModifier => !modifiers.includes(keyModifier)) |
| 175 | + .map(keyModifier => genEventExpression(keyModifier + 'Key')) |
| 176 | + .reduce((acc, item) => (acc ? or(acc, item) : item)), |
| 177 | + ), |
| 178 | + ) |
| 179 | + } else if (key === 'capture') { |
| 180 | + event = '!' + event |
| 181 | + } else if (key === 'once') { |
| 182 | + event = '~' + event |
| 183 | + } else if (key === 'native') { |
| 184 | + isNative = true |
| 185 | + } else { |
| 186 | + keys.push(key) |
| 187 | + } |
| 188 | + } |
| 189 | + |
| 190 | + if (keys.length) { |
| 191 | + code.push(genKeyFilter(keys)) |
| 192 | + } |
| 193 | + |
| 194 | + if (genModifierCode.length) { |
| 195 | + code.push(...genModifierCode) |
| 196 | + } |
| 197 | + |
| 198 | + if (code.length === 0) { |
| 199 | + return { |
| 200 | + event, |
| 201 | + expression, |
| 202 | + isNative, |
| 203 | + } |
| 204 | + } |
| 205 | + |
| 206 | + code.push(t.returnStatement(genCallExpression(expression, [t.identifier('$event')]))) |
| 207 | + |
| 208 | + return { |
| 209 | + event, |
| 210 | + expression: genHandlerFunction(code), |
| 211 | + isNative, |
| 212 | + } |
| 213 | + } |
| 214 | + |
| 215 | + function genKeyFilter(keys) { |
| 216 | + return genGuard(keys.map(genFilterCode).reduce((acc, item) => and(acc, item), not(hasButton()))) |
| 217 | + } |
| 218 | + |
| 219 | + function genFilterCode(key) { |
| 220 | + const keyVal = parseInt(key, 10) |
| 221 | + |
| 222 | + if (keyVal) { |
| 223 | + return notEq(genEventExpression('keyCode'), t.numericLiteral(keyVal)) |
| 224 | + } |
| 225 | + |
| 226 | + const keyCode = keyCodes[key] |
| 227 | + const keyName = keyNames[key] |
| 228 | + |
| 229 | + return t.callExpression(t.memberExpression(t.thisExpression(), t.identifier('_k')), [ |
| 230 | + genEventExpression('keyCode'), |
| 231 | + t.stringLiteral(`${key}`), |
| 232 | + keyCode |
| 233 | + ? Array.isArray(keyCode) |
| 234 | + ? t.arrayExpression(keyCode.map(number => t.numericLiteral(number))) |
| 235 | + : t.numericLiteral(keyCode) |
| 236 | + : t.identifier('undefined'), |
| 237 | + genEventExpression('key'), |
| 238 | + keyName |
| 239 | + ? Array.isArray(keyName) |
| 240 | + ? t.arrayExpression(keyName.map(number => t.stringLiteral(number))) |
| 241 | + : t.stringLiteral(`${keyName}`) |
| 242 | + : t.identifier('undefined'), |
| 243 | + ]) |
| 244 | + } |
| 245 | + |
| 246 | + function addEvent(event, expression, isNative, attributes) { |
| 247 | + if (event[0] !== '~' && event[0] !== '!') { |
| 248 | + attributes.push( |
| 249 | + t.jSXAttribute( |
| 250 | + t.jSXIdentifier(`${isNative ? 'nativeOn' : 'on'}-${event}`), |
| 251 | + t.jSXExpressionContainer(expression), |
| 252 | + ), |
| 253 | + ) |
| 254 | + } else { |
| 255 | + attributes.push( |
| 256 | + t.jSXSpreadAttribute( |
| 257 | + t.objectExpression([ |
| 258 | + t.objectProperty( |
| 259 | + t.identifier('on'), |
| 260 | + t.objectExpression([t.objectProperty(t.stringLiteral(event), expression)]), |
| 261 | + ), |
| 262 | + ]), |
| 263 | + ), |
| 264 | + ) |
| 265 | + } |
| 266 | + } |
| 267 | + |
| 268 | + return { |
| 269 | + inherits: syntaxJsx, |
| 270 | + visitor: { |
| 271 | + Program(path) { |
| 272 | + path.traverse({ |
| 273 | + JSXAttribute(path) { |
| 274 | + const { event, expression, isNative } = genHandler(path) |
| 275 | + |
| 276 | + if (event) { |
| 277 | + path.remove() |
| 278 | + |
| 279 | + addEvent(event, expression, isNative, path.parentPath.node.attributes) |
| 280 | + } |
| 281 | + }, |
| 282 | + }) |
| 283 | + }, |
| 284 | + }, |
| 285 | + } |
| 286 | +} |
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