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Add remark about vertical tab and \s

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Robert Krimen
2012-11-07 16:00:32 -08:00
parent 845172c82c
commit 5b38b16e99
2 changed files with 8 additions and 2 deletions
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@@ -90,12 +90,13 @@ For more information: http://github.com/robertkrimen/otto/tree/master/underscore
* Error reporting needs to be improved.
* Number.prototype.{toFixed,toExponential,toPrecision} are missing.
* Does not support the (?!) or (?=) regular expression syntax (because Go does not)
* JavaScript considers a vertical tab (\000B <VT>) to be part of the whitespace class (\s), while RE2 does not.
* Really, error reporting could use some improvement.
* For now, otto handles strings as UTF-8 rather than UTF-16.
### Regular Expression Syntax
Go translates JavaScript-style regular expressions into something that is regexp package compatible.
Go translates JavaScript-style regular expressions into something that is "regexp" package compatible.
Unfortunately, JavaScript has positive lookahead, negative lookahead, and backreferencing,
all of which are not supported by Go's RE2-like engine: https://code.google.com/p/re2/wiki/Syntax
@@ -104,6 +105,8 @@ A brief discussion of these limitations: "Regexp (?!re)" https://groups.google.c
More information about RE2: https://code.google.com/p/re2/
JavaScript considers a vertical tab (\000B <VT>) to be part of the whitespace class (\s), while RE2 does not.
### UTF-8 UTF-16
Internally, otto stores strings as Go does, which is UTF-8. JavaScript calls for strings to be handled as UTF-16.