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operators
* For consistency with other lexers, like the C/C++ lexer.
* `^*`, `^/` and `^#` are also true operators and shouldn't be styled
as regular commands.
This required introducing a new operator style (3).
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rendered as "TAB" without any indentation
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* This requires the new SCI_SETTABDRAWMODE(SCTD_CONTROLCHAR).
* It makes no sense to let TAB indent in TECO code as it can be
the insert-with-tab command (^I).
On the other hand large `I`-blocks could include TABs which are
actually meant as indentations.
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lParam as null-terminated strings
* Being able to embed null bytes into the lParam string is
practically useless - there aren't any messages where this is useful
and where there are no native SciTECO counterparts - so this case is now catched
and the null-byte separates wParam from lParam.
* wParam can be the empty string, but it is not supported to pass wParam as a
string and lParam as the empty string.
If the second string argument ends in ^@, lParam is popped from the stack instead.
* This is a temporary workaround until we can properly parse the Scintilla.iface and
generate more elegant per-message wrappers.
* It in particular unlocks the SCI_SETREPRESENTATION and SCI_SETPROPERTY messages.
The former allows us to write a special hex-editor macro which sets hexadecimal
character representations, while the latter allows you to set lexer properties.
* The C-based lexers ("cpp" in Lexilla) can now take preprocessor definitions into account.
This is disabled by default, unless you set lexer.c.defines before opening a file.
You can also set it interactively and re-set the lexer. For instance:
^U[lexer.c.defines]NDEBUG$ M[lexer.set.c]
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* You practically never want to indent in SciTECO code with hard tabs, as the hard tab is
an insertion command.
* 2-char soft tabs are the convention in SciTECO's included macros.
* Fixes the M#it macro among other things.
* If you do want to insert an insertion-with-tab command (ASCII 9), you almost always will
want to type it ^I instead.
Real ASCII 9s should consequently be highlighted, ie. there should be a character representation.
Unfortunately, character representations are currently set in C code and cannot be changed via <ES>.
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* The previous convention of !* ... *! are now true block comments,
i.e. they are parsed faster, don't spam the goto table and allow
embedding of exclamation marks - only "*!" terminates the comment.
* It is therefore now forbidden to have goto labels beginning with "*".
* Also support "!!" to introduce EOL comments (like C++'s //).
This disallows empty labels, but they weren't useful anyway.
This is the shortest way to begin a comment.
* All comment labels have been converted to true comments, to ensure
that syntax highlighting works correctly.
EOL comments are used for single line commented-out code, since it's
easiest to uncomment - you don't have to jump to the line end.
This is a pure convention / coding style.
Other people might do it differently.
* It's of course still possible to abuse goto labels as comments
as TECO did for ages.
* In lexing / syntax highlighting, labels and comments are highlighted differently.
* When syntax highlighting, a single "!" will first be highlighted as a label
since it's not yet unambiguous. Once you type the second character (* or !),
the first character is retroactively styled as a comment as well.
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It's a bit easier on the eyes.
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"identifier" to enable lexing in the container
* SCI_SETILEXER(NULL) is not a reliable way to do that since
that's the default for all views.
* This was breaking the git.tes lexer for instance and was unnecessarily
driving teco_lexer_style() on plain-text documents.
* Since we currently do not implement the ILexer5 C++ interface
and teco_view_t is just a pointer alias, we are abusing the view's "identifier" instead.
This is probably sufficient, as long as there is only one lexer "in the container".
Otherwise, there should perhaps be a single C++ class that does nothing but
wrapping a callback into an ILexer5 object with a C ABI.
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* this works by embedding the SciTECO parser and driving it always (exclusively)
in parse-only mode.
* A new teco_state_t::style determines the Scintilla style for any character
accepted in the given state.
* Therefore, the SciTECO lexer is always 100% exact and corresponds to the current
SciTECO grammer - it does not have to be maintained separately.
There are a few exceptions and tweaks, though.
* The contents of curly-brace escapes (`@^Uq{...}`) are rendered as ordinary
code using a separate parser instance.
This can be disabled with the lexer.sciteco.macrodef property.
Unfortunately, SciTECO does not currently allow setting lexer properties (FIXME).
* Labels and comments are currently styled the same.
This could change in the future once we introduce real comments.
* Lexers are usually implemented in C++, but I did not want to draw in C++.
Especially not since we'd have to include parser.h and other SciTECO headers,
that really do not want to keep C++-compatible.
Instead, the lexer is implemented "in the container".
@ES/SCI_SETILEXER/sciteco/ is internally translated to SCI_SETILEXER(NULL)
and we get Scintilla notifications when styling the view becomes necessary.
This is then centrally forwarded to the teco_lexer_style() which
uses the ordinary teco_view_ssm() API for styling.
* Once the command line becomes a Scintilla view even on Curses,
we can enabled syntax highlighting of the command line macro.
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