1 files changed, 108 insertions, 0 deletions
diff --git a/node_modules/vue/src/compiler/error-detector.js b/node_modules/vue/src/compiler/error-detector.js
new file mode 100644
index 00000000..e729c499
--- /dev/null
+++ b/node_modules/vue/src/compiler/error-detector.js
@@ -0,0 +1,108 @@
+/* @flow */
+
+import { dirRE, onRE } from './parser/index'
+
+// these keywords should not appear inside expressions, but operators like
+// typeof, instanceof and in are allowed
+const prohibitedKeywordRE = new RegExp('\\b' + (
+  'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
+  'super,throw,while,yield,delete,export,import,return,switch,default,' +
+  'extends,finally,continue,debugger,function,arguments'
+).split(',').join('\\b|\\b') + '\\b')
+
+// these unary operators should not be used as property/method names
+const unaryOperatorsRE = new RegExp('\\b' + (
+  'delete,typeof,void'
+).split(',').join('\\s*\\([^\\)]*\\)|\\b') + '\\s*\\([^\\)]*\\)')
+
+// strip strings in expressions
+const stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g
+
+// detect problematic expressions in a template
+export function detectErrors (ast: ?ASTNode): Array<string> {
+  const errors: Array<string> = []
+  if (ast) {
+    checkNode(ast, errors)
+  }
+  return errors
+}
+
+function checkNode (node: ASTNode, errors: Array<string>) {
+  if (node.type === 1) {
+    for (const name in node.attrsMap) {
+      if (dirRE.test(name)) {
+        const value = node.attrsMap[name]
+        if (value) {
+          if (name === 'v-for') {
+            checkFor(node, `v-for="${value}"`, errors)
+          } else if (onRE.test(name)) {
+            checkEvent(value, `${name}="${value}"`, errors)
+          } else {
+            checkExpression(value, `${name}="${value}"`, errors)
+          }
+        }
+      }
+    }
+    if (node.children) {
+      for (let i = 0; i < node.children.length; i++) {
+        checkNode(node.children[i], errors)
+      }
+    }
+  } else if (node.type === 2) {
+    checkExpression(node.expression, node.text, errors)
+  }
+}
+
+function checkEvent (exp: string, text: string, errors: Array<string>) {
+  const stipped = exp.replace(stripStringRE, '')
+  const keywordMatch: any = stipped.match(unaryOperatorsRE)
+  if (keywordMatch && stipped.charAt(keywordMatch.index - 1) !== '$') {
+    errors.push(
+      `avoid using JavaScript unary operator as property name: ` +
+      `"${keywordMatch[0]}" in expression ${text.trim()}`
+    )
+  }
+  checkExpression(exp, text, errors)
+}
+
+function checkFor (node: ASTElement, text: string, errors: Array<string>) {
+  checkExpression(node.for || '', text, errors)
+  checkIdentifier(node.alias, 'v-for alias', text, errors)
+  checkIdentifier(node.iterator1, 'v-for iterator', text, errors)
+  checkIdentifier(node.iterator2, 'v-for iterator', text, errors)
+}
+
+function checkIdentifier (
+  ident: ?string,
+  type: string,
+  text: string,
+  errors: Array<string>
+) {
+  if (typeof ident === 'string') {
+    try {
+      new Function(`var ${ident}=_`)
+    } catch (e) {
+      errors.push(`invalid ${type} "${ident}" in expression: ${text.trim()}`)
+    }
+  }
+}
+
+function checkExpression (exp: string, text: string, errors: Array<string>) {
+  try {
+    new Function(`return ${exp}`)
+  } catch (e) {
+    const keywordMatch = exp.replace(stripStringRE, '').match(prohibitedKeywordRE)
+    if (keywordMatch) {
+      errors.push(
+        `avoid using JavaScript keyword as property name: ` +
+        `"${keywordMatch[0]}"\n  Raw expression: ${text.trim()}`
+      )
+    } else {
+      errors.push(
+        `invalid expression: ${e.message} in\n\n` +
+        `    ${exp}\n\n` +
+        `  Raw expression: ${text.trim()}\n`
+      )
+    }
+  }
+}