On 2021-05-29, Hans Hagen <j.ha...@xs4all.nl> wrote:
> so what does vim expect? isn't there some kind of common format for lexers?
The output I need is very simple:
syn keyword Group1 <keyword1> <keyword2> ...
syn keyword Group2 <keyword1> <keyword2> ...
...
where Group1, Group2, ... define arbitrary groups of keywords. For
instance, for MetaFun I currently have `mpDef` (MetaPost def macro),
`mpVardef` (MetaPost vardef), `mpPrimaryDef`, `mpSecondaryDef`,
`mpTertiaryDef`, `mpCommand`, `mpConstant`, `mpVariable`, `mpType`,
`mpNewInternal`, and a few others. An excerpt from the current syntax
file looks like this:
...
" mp-base.mpiv
syn keyword mpNumExp graypart
syn keyword mpType graycolor greycolor
syn keyword mpConstant cyan magenta yellow
" mp-butt.mpiv
syn keyword mpDef predefinedbutton some_button
syn keyword mpConstant context_butt
" mp-char.mpiv
syn keyword mpDef flow_begin_chart flow_begin_sub_chart
syn keyword mpDef flow_chart_draw_comment flow_chart_draw_exit
...
syn keyword mpVardef flow_xy_on_grid flow_xy_right flow_xy_top
syn keyword mpVardef flow_y_on_grid
syn keyword mpVariable flow_arrowtip flow_chart_background_color
syn keyword mpVariable flow_chart_offset flow_comment_offset
syn keyword mpVariable flow_connection_arrow_size
...
This fine-grained classification allows for great flexibility when
defining syntax highlighting, because each group can have different
properties (and the user can customize that), although by default
several groups are highlighted in the same way (e.g., all macros have
the same highlighting by default).
Nicola
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