Sorry: data/enumerate => data/interval-map. On Wed, Dec 9, 2015 at 2:21 PM, Robby Findler <ro...@eecs.northwestern.edu> wrote: > You'd need to wire up your table with the after-insert and > after-delete methods, invalidating the appropriate parts. The behavior > you seem to want below is simple calls into the data/enumerate library > and more interesting invalidation is possible if you wish it. > > And you want to look at text%, not editor<%>. Some of the mixins in > the framework may also be interesting to you. > > You can do all the same fancyness if you have the data structure > parallel to the snip%s, of course. And it means you don't have to deal > with saving the information in files, which what snips are designed > for. > > Robby > > > On Wed, Dec 9, 2015 at 2:18 PM, David Christiansen > <da...@davidchristiansen.dk> wrote: >> Thanks for a fast answer, and for the recommendation! >> >> Right, it's all from the compiler. When the user opens a file, it is >> normal text; type checking turns it into an angry fruit salad of >> semantic information. >> >> Is there a way to automatically keep these things updated as the user >> edits the text? Ideally, if I edit the text "Nat", its semantic >> highlight should disappear, but all of the others should remain valid >> until the user type-checks the buffer again or edits them. In Emacs, I >> implement this kind of thing with overlays and markers, which stay >> synchronized with buffer positions as text is edited, but I don't see >> any way to mark a position in an `editor%' such that it moves according >> to insertions. Type checking an Idris module is fairly heavy, so I don't >> want to do it without the user asking for it, but the display should >> still look as nice as possible underway. This is why I was turning to a >> custom snip. A custom snip also seems to let the display be a bit more >> fancy, e.g. lighting up when the mouse goes over a semantic tag. >> >> Thanks! >> >> /David >> >> On 09/12/15 21:08, Robby Findler wrote: >>> My experience with this kind of thing suggests that keeping separate >>> tables on the side that map ranges in the editor to whatever >>> information you want is simpler and better. (Eg, check syntax.) Check >>> out data/interval-map. >>> >>> You don't want to save this information when the user saves, right? >>> That is, the user doesn't edit the file to insert this information; >>> it's all generated by the compiler, right? >>> >>> Robby >>> >>> On Wed, Dec 9, 2015 at 1:59 PM, David Christiansen >>> <da...@davidchristiansen.dk> wrote: >>>> Hi all, >>>> >>>> Summary: >>>> >>>> Do I need to do anything over and above defining `get-count' and >>>> `partial-offset' in a custom snip that has multiple items in order to >>>> have it work properly in an editor derived from `text%'? >>>> >>>> Details: >>>> >>>> I'm in the process of making a library to interface Racket with the >>>> Idris compiler, so that I can use the Racket slideshow language to make >>>> nifty interactive presentations that feature live Idris demos. As a part >>>> of doing this, I'm developing editors for Idris code and Idris REPLs. >>>> >>>> This library uses Idris's machine-readable REPL syntax, just like the >>>> Emacs and Atom modes. This will sometimes send strings to be shown to >>>> the user along with a list of offset-length-metadata triples that give >>>> additional information about the contents of the string (for example, >>>> that a certain three-character region refers to the qualified name >>>> "Prelude.Nat" with type "Type" and documentation summary "Unary natural >>>> numbers", and that the referent of this name is itself a type). >>>> >>>> What I want to do is to highlight some of these substrings by replacing >>>> them with a custom snip class that has a particular display, along with >>>> easy access to things like additional commands from the Idris compiler. >>>> Basically, they'll get a fancy UI, but most of the fanciness will be not >>>> immediately visible. When a user modifies the items (= characters) in >>>> the snip, it should revert back to an ordinary `string-snip%'. >>>> >>>> My problem is that, once I've replaced a portion of an editor with my >>>> custom snip class, the inserted snip is only considered to be one item >>>> long for purposes of calculating positions later in the editor. I've >>>> overridden get-count and partial-offset according to the instructions, >>>> and I believe that they are correct. Because this snip class simply has >>>> a field that is the string being highlighted, it has a field >>>> `display-name' that is the string to show. My `get-count' simply returns >>>> the length of this string, and I believe that `partial-offset' is >>>> correct because moving the caret over the new snip precisely highlights >>>> the width of the first character in blue. >>>> >>>> Do I need to do anything more to register this snip as containing >>>> multiple items, and to have its count taken into consideration when >>>> calculating positions and moving the caret? >>>> >>>> Thanks in advance! >>>> /David >>>> >>>> -- >>>> You received this message because you are subscribed to the Google Groups >>>> "Racket Users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send an >>>> email to racket-users+unsubscr...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>
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