first commit

app_vue/node_modules/eslint-plugin-vue/lib/rules/no-useless-v-bind.js

@@ -0,0 +1,152 @@
+/**
+ * @author Yosuke Ota
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const utils = require('../utils')
+
+const DOUBLE_QUOTES_RE = /"/gu
+const SINGLE_QUOTES_RE = /'/gu
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'disallow unnecessary `v-bind` directives',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/no-useless-v-bind.html'
+    },
+    fixable: 'code',
+    messages: {
+      unexpected: 'Unexpected `v-bind` with a string literal value.'
+    },
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          ignoreIncludesComment: {
+            type: 'boolean'
+          },
+          ignoreStringEscape: {
+            type: 'boolean'
+          }
+        },
+        additionalProperties: false
+      }
+    ],
+    type: 'suggestion'
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    const opts = context.options[0] || {}
+    const ignoreIncludesComment = opts.ignoreIncludesComment
+    const ignoreStringEscape = opts.ignoreStringEscape
+    const sourceCode = context.getSourceCode()
+
+    /**
+     * Report if the value expression is string literals
+     * @param {VDirective} node the node to check
+     */
+    function verify(node) {
+      const { value } = node
+      if (!value || node.key.modifiers.length) {
+        return
+      }
+      const { expression } = value
+      if (!expression) {
+        return
+      }
+      /** @type {string} */
+      let strValue
+      /** @type {string} */
+      let rawValue
+      if (expression.type === 'Literal') {
+        if (typeof expression.value !== 'string') {
+          return
+        }
+        strValue = expression.value
+        rawValue = sourceCode.getText(expression).slice(1, -1)
+      } else if (expression.type === 'TemplateLiteral') {
+        if (expression.expressions.length > 0) {
+          return
+        }
+        strValue = expression.quasis[0].value.cooked
+        rawValue = expression.quasis[0].value.raw
+      } else {
+        return
+      }
+
+      const tokenStore = context.parserServices.getTemplateBodyTokenStore()
+      const hasComment = tokenStore
+        .getTokens(value, { includeComments: true })
+        .some((t) => t.type === 'Block' || t.type === 'Line')
+      if (ignoreIncludesComment && hasComment) {
+        return
+      }
+
+      let hasEscape = false
+      if (rawValue !== strValue) {
+        // check escapes
+        const chars = [...rawValue]
+        let c = chars.shift()
+        while (c) {
+          if (c === '\\') {
+            c = chars.shift()
+            if (
+              c == null ||
+              // ignore "\\", '"', "'", "`" and "$"
+              'nrvtbfux'.includes(c)
+            ) {
+              // has useful escape.
+              hasEscape = true
+              break
+            }
+          }
+          c = chars.shift()
+        }
+      }
+      if (ignoreStringEscape && hasEscape) {
+        return
+      }
+
+      context.report({
+        node,
+        messageId: 'unexpected',
+        *fix(fixer) {
+          if (hasComment || hasEscape) {
+            // cannot fix
+            return
+          }
+          const text = sourceCode.getText(value)
+          const quoteChar = text[0]
+
+          const shorthand = node.key.name.rawName === ':'
+          /** @type {Range} */
+          const keyDirectiveRange = [
+            node.key.name.range[0],
+            node.key.name.range[1] + (shorthand ? 0 : 1)
+          ]
+
+          yield fixer.removeRange(keyDirectiveRange)
+
+          let attrValue
+          if (quoteChar === '"') {
+            attrValue = strValue.replace(DOUBLE_QUOTES_RE, '"')
+          } else if (quoteChar === "'") {
+            attrValue = strValue.replace(SINGLE_QUOTES_RE, ''')
+          } else {
+            attrValue = strValue
+              .replace(DOUBLE_QUOTES_RE, '"')
+              .replace(SINGLE_QUOTES_RE, ''')
+          }
+          yield fixer.replaceText(expression, attrValue)
+        }
+      })
+    }
+
+    return utils.defineTemplateBodyVisitor(context, {
+      "VAttribute[directive=true][key.name.name='bind'][key.argument!=null]":
+        verify
+    })
+  }
+}