otto

Package otto is a JavaScript parser and interpreter written natively in Go. http://godoc.org/github.com/robertkrimen/otto Run something in the VM Get a value out of the VM Set a number Set a string Get the value of an expression An error happens Set a Go function Set a Go function that returns something useful Use the functions in JavaScript A separate parser is available in the parser package if you're just interested in building an AST. http://godoc.org/github.com/robertkrimen/otto/parser Parse and return an AST otto You can run (Go) JavaScript from the commandline with: http://github.com/robertkrimen/otto/tree/master/otto Run JavaScript by entering some source on stdin or by giving otto a filename: underscore Optionally include the JavaScript utility-belt library, underscore, with this import: For more information: http://github.com/robertkrimen/otto/tree/master/underscore The following are some limitations with otto: Go translates JavaScript-style regular expressions into something that is "regexp" compatible via `parser.TransformRegExp`. Unfortunately, RegExp requires backtracking for some patterns, and backtracking is not supported by the standard Go engine: https://code.google.com/p/re2/wiki/Syntax Therefore, the following syntax is incompatible: A brief discussion of these limitations: "Regexp (?!re)" https://groups.google.com/forum/?fromgroups=#%21topic/golang-nuts/7qgSDWPIh_E More information about re2: https://code.google.com/p/re2/ In addition to the above, re2 (Go) has a different definition for \s: [\t\n\f\r ]. The JavaScript definition, on the other hand, also includes \v, Unicode "Separator, Space", etc. If you want to stop long running executions (like third-party code), you can use the interrupt channel to do this: Where is setTimeout/setInterval? These timing functions are not actually part of the ECMA-262 specification. Typically, they belong to the `windows` object (in the browser). It would not be difficult to provide something like these via Go, but you probably want to wrap otto in an event loop in that case. For an example of how this could be done in Go with otto, see natto: http://github.com/robertkrimen/natto Here is some more discussion of the issue: * http://book.mixu.net/node/ch2.html * http://en.wikipedia.org/wiki/Reentrancy_%28computing%29 * http://aaroncrane.co.uk/2009/02/perl_safe_signals/
17 versions
Latest release: over 1 year ago
1,821 dependent packages

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