Re: GJS : How can I use Regex ( parse HTML ) ?

[Anastasios Lisgaras <tasosnumberten yahoo gr>]

Thank you very much for your immediate and fuller answers,

I didn't know that I use version 1.50.?? and even more that uses
SpiderMonkey 52. ( I didn't even know what exactly it is SpiderMonkey -
Sorry ). So the JavaScript code I'm looking for every time should be for
the version of SpiderMonkey that I have.

They are very useful and interesting points of view, however, the
quickest and simplest way that i can is to stay in regular expressions?

Thank you very much for your very helpful and complete views and references.
Lisgaras Anastasios

On 6/25/19 1:58 AM, Emmanuele Bassi via javascript-list wrote:
> On Mon, 24 Jun 2019 at 21:15, Tony Houghton <h realh co uk
> <mailto:h realh co uk>> wrote:
>
>
>     On Mon, 24 Jun 2019 at 18:56, makepost <makepost firemail cc> wrote:
>
>
>         Regex and MarkupParser from GLib won't work because they don't have
>         constructors compatible with GObject introspection, so only
>         their helper
>         methods such as escape or match_simple are visible to Gjs.
>
>
>     Do you mean because they have non-standard ref and unref funcs? They
>     should still be usable from gjs. They don't seem to have unref-func
>     and ref-func annotations, but perhaps bindings can automatically
>     infer that from the method names being unref and ref? If not, it's a
>     bit shocking that nobody's added the annotations in all this time,
>     but the worst that could happen is a memory leak.
>
>
> GMarkupContext has ref/unref functions, and it even has a boxed GType,
> so the type system knows how to copy and free data. The problem is
> GMarkupParser, the structured type you use to define your own parser.
>
> The issue is that GMarkup is a very, very C-oriented, low level API. It
> really doesn't work in a way that is safely bindable to other
> languages???from the use of function pointers in a struct, to the variadic
> arguments in the attribute collection, passing through the single scope
> for the vfunc data. At most you can pass around GMarkupContext
> instances, but implementing a GMarkupParser to go along with it is not
> possible.
>
> Additionally, GMarkup is *emphatically* not a generic XML parser.
> GMarkup, as its documentation *clearly* states, is "intended to parse a
> simple markup format that's a subset of XML"; additionally, it "must not
> be used if you expect to parse untrusted input". This means you should
> only ever use it to parse some XML fragment you yourself have created,
> or a *very* well-defined subset of XML. In other words: it's fine for
> parsing a cache file, or some configuration file, but as soon as you put
> non-validated user input in the middle of it, you cannot have any
> expectation of things not blowing up.
>
> The expectation is that anything that requires a proper XML parser would
> have its own library???like libxml2. Various languages have bindings for
> it. Sadly, it's not introspectable because it's not using GLib or
> GObject, so you'd have to write your own GObject wrapper around it, and
> then use the introspection data generated from that. There's a GXml
> library using libxml2 underneath, written in Vala, that exposes a C ABI
> and introspection data:
>
> ?? https://gitlab.gnome.org/GNOME/gxml
>
> Ciao,
> ??Emmanuele.
> ??
> -- 
> https://www.bassi.io
> [@] ebassi [@gmail.com <http://gmail.com>]
>
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