On 05/18/2017 12:45 AM, Mark Waddingham via use-livecode wrote:
You can define constants using:
constant X is Y
Currently Y has to be a literal - not an expression (just like LCS).
Didn't find it in the dictionary, but I do see that now in the language
reference. How would one define a quote constant?
constant quote is "\q" ?
The language guide explicitly states "Note: Constants are not currently
implemented, although the syntax is recognised." What am I supposed to
make of that?
Is it even possible to set the various delimiters? The documentation
only talks about retrieving them. The description talks about the
calling (script) handler's <type>Delimiter property... is this an
actual property of the object or is just a shorthand way of talking
about "the <type>Delimiter"?
No - the context local properties are a LiveCode Script feature, they
don't exist in LCB.
The 'the <type>Delimiter' syntax gives you access to the values of those
properties in the most recent LCS stack frame allowing LCB to do similar
things as the engine can in its commands and functions.
That's unfortunate. In LCS I often change the itemdelimiter in order to
parse complex strings. The lack of the ability to manipulate things at
this level is a serious detriment to text parsing, which is one of the
main strengths of LCS.
The pointer type isn't documented.
Well it is listed in the language reference ;)
Ah. So the dictionary isn't a good place to look for things. I'll spend
some time working my way through the language reference instead.
LCB's syntax is quite minimal at the moment, it isn't meant to be a
replacement for LCS (as mentioned before) - it is intended as a language
which makes explicit the implicit patterns and abstractions which exist
(albeit hand-coded in most cases) in the engine, so that they can be used
to build the abstractions which we use everyday in LCS - and extend them
in a natural way.
For example, line and item chunks are actually an incarnation of what
you might call a 'delimited chunk' - they have identical semantics, apart
from where the delimiter to use is fetched from (the *delimiter property
in local context).
Similarly, word and token are 'tokenized chunks' - they action could be
described by a regular expression.
See above (itemdelimiter).
--
Mark Wieder
ahsoftw...@gmail.com
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