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51 lines
1.0 KiB
JavaScript
51 lines
1.0 KiB
JavaScript
"use strict";
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const VM_VARS = {
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"module": true,
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"process": true,
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"VM_VARS": true,
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"PREFACE_VARS": true,
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"generateDeclaration": true,
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"runInContext": true,
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"code": true,
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"preface": true,
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};
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const PREFACE_VARS = Object.keys( VM_VARS )
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.map( name => `var ${ name } = void 0;` )
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.join( " " );
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function generateDeclaration( name ) {
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return ( ! VM_VARS[ name ] ? "var " : "" )
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+ `${ name } = vm$context.${ name };`;
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}
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module.exports = {
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// `eval` the given code, using properties found in `context` as top-level
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// variables, while hiding some variables in this module from the code.
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//
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// Based on `vm.runInContext` found in Node.js, this is a cross-env solution.
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runInContext( code, vm$context ) {
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let preface = PREFACE_VARS;
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if ( typeof vm$context === "object" ) {
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preface += Object.keys( vm$context )
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.map( generateDeclaration )
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.join( " " );
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}
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return eval( preface + code );
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},
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};
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