68 lines
1.8 KiB
TypeScript
68 lines
1.8 KiB
TypeScript
// these keywords should not appear inside expressions, but operators like
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import { SimpleExpressionNode } from './ast'
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import { TransformContext } from './transform'
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import { createCompilerError, ErrorCodes } from './errors'
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// typeof, instanceof and in are allowed
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const prohibitedKeywordRE = new RegExp(
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'\\b' +
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(
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'do,if,for,let,new,try,var,case,else,with,await,break,catch,class,const,' +
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'super,throw,while,yield,delete,export,import,return,switch,default,' +
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'extends,finally,continue,debugger,function,arguments,typeof,void'
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)
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.split(',')
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.join('\\b|\\b') +
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'\\b'
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)
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// strip strings in expressions
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const stripStringRE = /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|`(?:[^`\\]|\\.)*\$\{|\}(?:[^`\\]|\\.)*`|`(?:[^`\\]|\\.)*`/g
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/**
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* Validate a non-prefixed expression.
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* This is only called when using the in-browser runtime compiler since it
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* doesn't prefix expressions.
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*/
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export function validateBrowserExpression(
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node: SimpleExpressionNode,
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context: TransformContext,
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asParams = false,
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asRawStatements = false
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) {
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const exp = node.content
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// empty expressions are validated per-directive since some directives
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// do allow empty expressions.
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if (!exp.trim()) {
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return
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}
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try {
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new Function(
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asRawStatements
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? ` ${exp} `
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: `return ${asParams ? `(${exp}) => {}` : `(${exp})`}`
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)
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} catch (e) {
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let message = e.message
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const keywordMatch = exp
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.replace(stripStringRE, '')
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.match(prohibitedKeywordRE)
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if (keywordMatch) {
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message = `avoid using JavaScript keyword as property name: "${
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keywordMatch[0]
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}"`
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}
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context.onError(
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createCompilerError(
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ErrorCodes.X_INVALID_EXPRESSION,
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node.loc,
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undefined,
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message
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)
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)
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}
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}
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