Comment #5 on issue 4268 by [email protected]: getEvalOrigin already
rendered in violation of spec
https://code.google.com/p/v8/issues/detail?id=4268
It is a desired property. By showing only the string, one has to parse the
string *reliably* to recover the structured information. However, property
names and soon the .name property of functions can be arbitrary strings.
And source locations are either arbitrary strings or at least arbitrary
URIs -- I'm not sure. If you present me with only the rendered string, then
you need to carefully specify and adhere to escaping rules if one of these
strings contains syntax that is also used in this rendering. (We've been
through this nightmare over and over again on the web. Let's not repeat it
where it isn't already entrenched.)
For example, the code at
https://github.com/tvcutsem/es-lab/blob/master/src/ses/debug.js#L129 ,
which is used at
https://github.com/tvcutsem/es-lab/blob/master/src/ses/debug.js#L348 to
work around this bug, says:
// [...] On all, we assume the
// function name, if any, has no colon (":"), at-sign ("@"), or
// open paren ("("), as each of these are used to recognize
// other parts of a debug line.
There is no basis for this assumption, but there's currently no safe
alternative. And I doubt that the conditions I enumerate above are
sufficient anyway.
Even if you do come out with adequate escaping rules which you carefully
specify, many will do what I do there: use regexps to recognize most cases,
where these regexps can be misled by bizarre cases, including purposely
constructed bizarre cases. The web has a long history of despair built on
people using regexps to try to recognize structure in a text encoding of
structure.
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