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|
structure C = Compiler
fun debug (str: string): unit =
(TextIO.output (TextIO.stdErr, str ^ "\n\n"); TextIO.flushOut TextIO.stdErr)
fun trim (s: substring): substring =
Substring.dropr
(fn c => c = #" " orelse c = #"\n" orelse c = #"\r")
(Substring.dropl (fn c => c = #" " orelse c = #"\n" orelse c = #"\r") s)
fun joinStr (sep: string) (strs: string list): string =
List.foldl (fn (str, acc) => if acc = "" then str else acc ^ sep ^ str) "" strs
structure FromJson = struct
fun get (s: string) (l: Json.json): Json.json =
case l of
Json.Obj pairs =>
(case List.find (fn tup => #1 tup = s) pairs of
NONE => raise Fail ("Failed to find JSON object key " ^ s ^ " in " ^ Json.print l)
| SOME tup => #2 tup)
| _ => raise Fail ("Expected JSON object, got: " ^ Json.print l)
fun asInt (j: Json.json): int =
case j of
Json.Int i => i
| _ => raise Fail ("Expected JSON int, got: " ^ Json.print j)
fun asString (j: Json.json): string =
case j of
Json.String s => s
| _ => raise Fail ("Expected JSON string, got: " ^ Json.print j)
fun asOptionalInt (j: Json.json): int option =
case j of
Json.Null => NONE
| Json.Int i => SOME i
| _ => raise Fail ("Expected JSON int or null, got: " ^ Json.print j)
fun asOptionalString (j: Json.json): string option =
case j of
Json.Null => NONE
| Json.String s => SOME s
| _ => raise Fail ("Expected JSON string or null, got: " ^ Json.print j)
end
structure LspSpec (* :> LSPSPEC *) = struct
fun readHeader (): (string * string) option =
let
val line = TextIO.inputLine TextIO.stdIn
in
case line of
NONE => OS.Process.exit OS.Process.success
| SOME str =>
if Substring.isEmpty (trim (Substring.full str))
then NONE
else
let
val (key, value) = Substring.splitl (fn c => c <> #":") (Substring.full str)
in
if Substring.isEmpty (trim value)
then raise Fail ("Failed to parse LSP header: Line is not empty but is also not a valid header: " ^ str)
else SOME ( Substring.string (trim key)
, Substring.string (trim (Substring.dropl (fn c => c = #":") (trim value))))
end
end
fun readAllHeaders (): (string * string) list =
let
fun doReadAllHeaders (l: (string * string) list): (string * string) list =
case readHeader () of
NONE => l
| SOME tup => tup :: doReadAllHeaders l
in
doReadAllHeaders []
end
datatype message =
RequestMessage of { id: Json.json, method: string, params: Json.json}
| Notification of { method: string, params: Json.json}
fun parseMessage (j: Json.json): message =
let
val id = SOME (FromJson.get "id" j)
handle ex => NONE
val method = FromJson.asString (FromJson.get "method" j)
val params = FromJson.get "params" j
in
case id of
NONE => Notification {method = method, params = params}
| SOME id => RequestMessage {id = id, method = method, params = params}
end
type documentUri =
{ scheme: string
, authority: string
, path: string
, query: string
, fragment: string
}
fun parseDocumentUri (str: string): documentUri =
let
val str = Substring.full str
val (scheme, rest) = Substring.splitl (fn c => c <> #":") str
val (authority, rest) = Substring.splitl (fn c => c <> #"/") (Substring.triml 3 rest (* :// *))
val (path, rest) = Substring.splitl (fn c => c <> #"?" orelse c <> #"#") rest
val (query, rest) = if Substring.first rest = SOME #"?"
then Substring.splitl (fn c => c <> #"#") (Substring.triml 1 rest (* ? *))
else (Substring.full "", rest)
val fragment = if Substring.first rest = SOME #"#"
then (Substring.triml 1 rest (* # *))
else Substring.full ""
in
{ scheme = Substring.string scheme
, authority = Substring.string authority
, path = Substring.string path
, query = Substring.string query
, fragment = Substring.string fragment
}
end
fun printDocumentUri (d: documentUri) =
(#scheme d) ^ "://" ^
(#authority d) ^
(#path d) ^
(if #query d <> "" then "?" ^ #query d else "") ^
(if #fragment d <> "" then "#" ^ #fragment d else "")
type textDocumentIdentifier = { uri: documentUri}
fun parseTextDocumentIdentifier (j: Json.json): textDocumentIdentifier =
{ uri = parseDocumentUri (FromJson.asString (FromJson.get "uri" j))}
type versionedTextDocumentIdentifier =
{ uri: documentUri
, version: int option
}
fun parseVersionedTextDocumentIdentifier (j: Json.json): versionedTextDocumentIdentifier =
{ uri = parseDocumentUri (FromJson.asString (FromJson.get "uri" j))
, version = FromJson.asOptionalInt (FromJson.get "version" j)
}
type textDocumentItem = {
uri: documentUri,
languageId: string,
version: int, (* The version number of this document (it will increase after each change, including undo/redo). *)
text: string
}
fun parseTextDocumentItem (j: Json.json) =
{ uri = parseDocumentUri (FromJson.asString (FromJson.get "uri" j))
, languageId = FromJson.asString (FromJson.get "languageId" j)
, version = FromJson.asInt (FromJson.get "version" j)
, text = FromJson.asString (FromJson.get "text" j)
}
type position = { line: int
, character: int
}
fun parsePosition (j: Json.json) =
{ line = FromJson.asInt (FromJson.get "line" j)
, character = FromJson.asInt (FromJson.get "character" j)
}
fun printPosition (p: position): Json.json = Json.Obj [ ("line", Json.Int (#line p))
, ("character", Json.Int (#character p))]
type range = { start: position
, end_: position }
fun printRange (r: range): Json.json = Json.Obj [ ("start", printPosition (#start r))
, ("end", printPosition (#end_ r))]
fun readRequestFromStdIO (): message =
let
val headers = readAllHeaders ()
val lengthO = List.find (fn (k,v) => k = "Content-Length") headers
val request = case lengthO of
NONE => raise Fail "No header with Content-Length found"
| SOME (k, v) =>
case Int.fromString v of
NONE => raise Fail ("Couldn't parse content-length from string: " ^ v)
| SOME i => TextIO.inputN (TextIO.stdIn, i)
val parsed = Json.parse request
in
parseMessage parsed
end
type hoverReq = { textDocument: textDocumentIdentifier , position: position }
type hoverResp = {contents: string} option
fun parseHoverReq (params: Json.json): hoverReq =
{ textDocument = parseTextDocumentIdentifier (FromJson.get "textDocument" params)
, position = parsePosition (FromJson.get "position" params)
}
fun printHoverResponse (resp: hoverResp): Json.json =
case resp of
NONE => Json.Null
| SOME obj => Json.Obj [("contents", Json.String (#contents obj))]
type didOpenParams = { textDocument: textDocumentItem }
fun parseDidOpenParams (params: Json.json): didOpenParams =
{ textDocument = parseTextDocumentItem (FromJson.get "textDocument" params) }
type didChangeParams = { textDocument: versionedTextDocumentIdentifier }
fun parseDidChangeParams (params: Json.json): didChangeParams =
{ textDocument = parseVersionedTextDocumentIdentifier (FromJson.get "textDocument" params)
(* , contentChanges = ... *)
}
type didSaveParams = { textDocument: textDocumentIdentifier }
fun parseDidSaveParams (params: Json.json): didSaveParams =
{ textDocument = parseTextDocumentIdentifier (FromJson.get "textDocument" params)
(* , text = ... *)
}
type initializeParams =
{ rootUri: documentUri option }
fun parseInitializeParams (j: Json.json) =
{ rootUri =
Option.map
parseDocumentUri
(FromJson.asOptionalString (FromJson.get "rootUri" j))
}
type diagnostic = { range: range
(* code?: number | string *)
, severity: int (* 1 = error, 2 = warning, 3 = info, 4 = hint*)
, source: string
, message: string
(* relatedInformation?: DiagnosticRelatedInformation[]; *)
}
fun printDiagnostic (d: diagnostic): Json.json =
Json.Obj [ ("range", printRange (#range d))
, ("severity", Json.Int (#severity d))
, ("source", Json.String (#source d))
, ("message", Json.String (#message d))
]
type publishDiagnosticsParams = { uri: documentUri
, diagnostics: diagnostic list
}
fun printPublishDiagnosticsParams (p: publishDiagnosticsParams): Json.json =
Json.Obj [ ("uri", Json.String (printDocumentUri (#uri p)))
, ("diagnostics", Json.Array (List.map printDiagnostic (#diagnostics p)))]
type initializeResponse = { capabilities:
{ hoverProvider: bool
, textDocumentSync:
{ openClose: bool
, save: { includeText: bool } option
}
}}
fun printInitializeResponse (res: initializeResponse) =
Json.Obj [("capabilities",
let
val capabilities = #capabilities res
in
Json.Obj [ ("hoverProvider", Json.Bool (#hoverProvider capabilities))
, ("textDocumentSync",
let
val textDocumentSync = #textDocumentSync capabilities
in
Json.Obj [ ("openClose", Json.Bool (#openClose textDocumentSync ))
, ("save", case #save textDocumentSync of
NONE => Json.Null
| SOME save => Json.Obj [("includeText", Json.Bool (#includeText save) )])]
end
)]
end
)]
datatype 'a result =
Success of 'a
| Error of (int * string)
fun mapResult (f: 'a -> 'b) (a: 'a result): 'b result =
case a of
Success contents => Success (f contents)
| Error e => Error e
type toclient = { showMessage: string -> int -> unit
, publishDiagnostics: publishDiagnosticsParams -> unit }
type messageHandlers =
{ initialize: initializeParams -> initializeResponse result
, shutdown: unit -> unit result
, textDocument_hover: toclient -> hoverReq -> hoverResp result
}
fun showMessage str typ =
let
val jsonToPrint = Json.print (Json.Obj [ ("jsonrpc", Json.String "2.0")
, ("method", Json.String "window/showMessage")
, ("params", Json.Obj [ ("type", Json.Int typ)
, ("message", Json.String str)])
])
val toPrint = "Content-Length:" ^ Int.toString (String.size jsonToPrint) ^ "\r\n\r\n" ^ jsonToPrint
in
TextIO.print toPrint
end
fun publishDiagnostics diags =
let
val jsonToPrint = Json.print ((Json.Obj [ ("jsonrpc", Json.String "2.0")
, ("method", Json.String "textDocument/publishDiagnostics")
, ("params", printPublishDiagnosticsParams diags)
]))
val toPrint = "Content-Length:" ^ Int.toString (String.size jsonToPrint) ^ "\r\n\r\n" ^ jsonToPrint
in
TextIO.print toPrint
end
val toclient: toclient = {showMessage = showMessage, publishDiagnostics = publishDiagnostics}
fun handleMessage
(requestMessage: {id: Json.json, method: string, params: Json.json})
(handlers: messageHandlers)
: unit =
let
val result: Json.json result =
case #method requestMessage of
"initialize" =>
mapResult
printInitializeResponse
((#initialize handlers)
(parseInitializeParams (#params requestMessage)))
| "textDocument/hover" =>
mapResult
printHoverResponse
((#textDocument_hover handlers)
toclient
(parseHoverReq (#params requestMessage)))
| "shutdown" =>
mapResult
(fn () => Json.Null)
((#shutdown handlers) ())
| "exit" =>
OS.Process.exit OS.Process.success
| method => Error (~32601, "Method not supported: " ^ method)
(* val () = (TextIO.output (TextIO.stdErr, "Got result: " ^ (case result of Success _ => "success\n" *)
(* | Error _ => "error\n")); TextIO.flushOut TextIO.stdErr) *)
in
case result of
Success j =>
let
val jsonToPrint =
Json.print (Json.Obj [ ("id", #id requestMessage)
, ("jsonrpc", Json.String "2.0")
, ("result", j)
])
val toPrint = "Content-Length:" ^ Int.toString (String.size jsonToPrint) ^ "\r\n\r\n" ^ jsonToPrint
in
TextIO.print toPrint
end
| Error (i, err) =>
let
val jsonToPrint =
Json.print (Json.Obj [ ("id", #id requestMessage)
, ("jsonrpc", Json.String "2.0")
, ("error", Json.Obj [ ("code", Json.Int i)
, ("message", Json.String err)
])
])
val toPrint = "Content-Length:" ^ Int.toString (String.size jsonToPrint) ^ "\r\n\r\n" ^ jsonToPrint
in
TextIO.print toPrint
end
end
type notificationHandlers =
{ initialized: unit -> unit
, textDocument_didOpen: toclient -> didOpenParams -> unit
, textDocument_didChange: toclient -> didChangeParams -> unit
, textDocument_didSave: toclient -> didSaveParams -> unit
}
fun handleNotification
(notification: {method: string, params: Json.json})
(handlers: notificationHandlers)
=
case #method notification of
"initialized" => (#initialized handlers) ()
| "textDocument/didOpen" => (#textDocument_didOpen handlers) toclient (parseDidOpenParams (#params notification))
| "textDocument/didChange" => (#textDocument_didChange handlers) toclient (parseDidChangeParams (#params notification))
| "textDocument/didSave" => (#textDocument_didSave handlers) toclient (parseDidSaveParams (#params notification))
| m => debug ("Notification method not supported: " ^ m)
end
structure Lsp :> LSP = struct
datatype lspError = InternalError of string
exception LspError of lspError
fun handleLspErrorInNotification (e: lspError) : unit =
let
fun print (message: string) =
let
val jsonStr = Json.print (Json.Obj [ ("jsonrpc", Json.String "2.0")
, ("method", Json.String "window/showMessage")
, ("params", Json.Obj [ ("type", Json.Int 1 (* Error*))
, ("message", Json.String message)])
])
in
TextIO.print ("Content-Length:" ^ Int.toString (String.size jsonStr) ^ "\r\n\r\n" ^ jsonStr)
end
in
case e of
InternalError str => print str
end
fun handleLspErrorInRequest (id: Json.json) (e: lspError): unit =
let
fun print (code: int) (message: string) =
let
val jsonStr = Json.print (Json.Obj [ ("jsonrpc", Json.String "2.0")
, ("id", id)
, ("error", Json.Obj [ ("code", Json.Int code (* Error*))
, ("message", Json.String message)])
])
in
TextIO.print ("Content-Length:" ^ Int.toString (String.size jsonStr) ^ "\r\n\r\n" ^ jsonStr)
end
in
case e of
InternalError str => print (~32603) str
end
structure SK = struct
type ord_key = string
val compare = String.compare
end
structure SM = BinaryMapFn(SK)
type fileState =
{ decls : Elab.decl list }
type state =
{ urpPath : string
, fileStates : fileState SM.map
}
val stateRef = ref (NONE: state option)
fun scanDir (f: string -> bool) (path: string) =
let
val dir = OS.FileSys.openDir path
fun doScanDir acc =
case OS.FileSys.readDir dir of
NONE => (OS.FileSys.closeDir dir; acc)
| SOME fname =>
(if f fname
then doScanDir (fname :: acc)
else doScanDir acc)
in
doScanDir []
end
(* Throws Fail if can't init *)
fun initState (initParams: LspSpec.initializeParams): state =
let
val rootPath = case #rootUri initParams of
NONE => raise Fail "No rootdir found"
| SOME a => #path a
val foundUrps = scanDir (fn fname => OS.Path.ext fname = SOME "urp") rootPath
in
{ urpPath = case foundUrps of
[] => raise Fail ("No .urp files found in path " ^ rootPath)
| one :: [] => OS.Path.base (OS.Path.file one)
| many => raise Fail ("Found multiple .urp files in path " ^ rootPath)
, fileStates = SM.empty
}
end
fun addSgnToEnv (env: ElabEnv.env) (sgn: Source.sgn_item list) (fileName: string) (addUnprefixed: bool): ElabEnv.env =
let
val moduleName = C.moduleOf fileName
val (sgn, gs) = Elaborate.elabSgn (env, Disjoint.empty) (Source.SgnConst sgn, { file = fileName
, first = ErrorMsg.dummyPos
, last = ErrorMsg.dummyPos })
val () = case gs of
[] => ()
| _ => (app (fn (_, env, _, c1, c2) =>
Print.prefaces "Unresolved"
[("c1", ElabPrint.p_con env c1),
("c2", ElabPrint.p_con env c2)]) gs;
raise Fail ("Unresolved disjointness constraints in " ^ moduleName ^ " at " ^ fileName)) (* TODO Not sure if this is needed for all signatures or only for Basis *)
val (env', n) = ElabEnv.pushStrNamed env moduleName sgn
val (_, env') = if addUnprefixed
then Elaborate.dopen env' {str = n, strs = [], sgn = sgn}
else ([], env')
in
env'
end
fun errorToDiagnostic (err: { span: ErrorMsg.span , message: string }): LspSpec.diagnostic =
{ range = { start = { line = #line (#first (#span err)) - 1
, character = #char (#first (#span err))
}
, end_ = { line = #line (#last (#span err)) - 1
, character = #char (#last (#span err))
}
}
, severity = 1
, source = "UrWeb"
, message = #message err
}
(* TODO FFI modules ? Check compiler.sml -> parse -> parseFfi *)
(* TODO Optim: cache parsed urp file? *)
fun calculateFileState (state: state) (fileName: string): (fileState option * LspSpec.diagnostic list) =
let
val () = if (OS.Path.ext fileName = SOME "ur")
then ()
else raise Fail ("Can only handle .ur files for now")
val () = Elaborate.unifyMore := true
(* To reuse Basis and Top *)
val () = Elaborate.incremental := true
(* Parsing .urp *)
val job = case C.run (C.transform C.parseUrp "parseUrp") (#urpPath state) of
NONE => raise LspError (InternalError ("Couldn't parse .urp file at " ^ (#urpPath state)))
| SOME a => a
val moduleSearchRes =
List.foldl
(fn (entry, acc) => if #2 acc
then acc
else
if entry ^ ".ur" = fileName
then (List.rev (#1 acc), true)
else (entry :: #1 acc, false))
([] (* modules before *), false (* module found *))
(#sources job)
val modulesBeforeThisFile = #1 moduleSearchRes
val () = if #2 moduleSearchRes
then ()
else raise LspError (InternalError ("Couldn't find file " ^ fileName ^ " referenced in .urp file at " ^ (#urpPath state)))
(* Parsing .urs files of previous modules *)
val parsedUrss = List.map (fn entry =>
let
val fileName = entry ^ ".urs"
in
{ fileName = fileName
, parsed =
if OS.FileSys.access (fileName, [])
then case C.run (C.transform C.parseUrs "parseUrs") fileName of
NONE => raise LspError (InternalError ("Failed to parse .urs file at " ^ fileName))
| SOME a => a
else raise LspError (InternalError ("Couldn't find an .urs file for " ^ fileName))
}
end)
modulesBeforeThisFile
(* Parsing Basis and Top *)
val basisF = Settings.libFile "basis.urs"
val topF = Settings.libFile "top.urs"
val topF' = Settings.libFile "top.ur"
val tm1 = OS.FileSys.modTime topF
val tm2 = OS.FileSys.modTime topF'
val parsedBasisUrs =
case C.run (C.transform C.parseUrs "parseUrs") basisF of
NONE => raise LspError (InternalError ("Failed to parse basis.urs file at " ^ basisF))
| SOME a => a
val parsedTopUrs =
case C.run (C.transform C.parseUrs "parseUrs") topF of
NONE => raise LspError (InternalError ("Failed to parse top.urs file at " ^ topF))
| SOME a => a
val parsedTopUr =
case C.run (C.transform C.parseUr "parseUr") topF' of
NONE => raise LspError (InternalError ("Failed to parse top.ur file at " ^ topF'))
| SOME a => a
(* Parsing .ur and .urs of current file *)
val (parsedUrs: Source.sgn option) =
(if OS.FileSys.access (fileName ^ "s", [])
then
case C.run (C.transform C.parseUrs "parseUrs") (fileName ^ "s") of
NONE => NONE
| SOME a => SOME ( Source.SgnConst a
, {file = fileName ^ "s", first = ErrorMsg.dummyPos, last = ErrorMsg.dummyPos})
else
NONE) handle ex => NONE
val () = ErrorMsg.resetErrors ()
val (parsedUrO: (Source.decl list) option) =
C.run (C.transform C.parseUr "parseUr") fileName
in
case parsedUrO of
NONE => (* Parse error *) (NONE, List.map errorToDiagnostic (ErrorMsg.readErrorLog ()))
| SOME parsedUr =>
(* Parsing of .ur succeeded *)
let
val loc = {file = fileName, first = ErrorMsg.dummyPos, last = ErrorMsg.dummyPos}
val res = Elaborate.elabFile
parsedBasisUrs tm1 parsedTopUr parsedTopUrs tm2 ElabEnv.empty
(* Adding urs's of previous modules to env *)
(fn envB => List.foldl (fn (sgn, env) => addSgnToEnv env (#parsed sgn) (#fileName sgn) false) envB parsedUrss)
[( Source.DStr (C.moduleOf fileName, parsedUrs, NONE, (Source.StrConst parsedUr, loc), false)
, loc )]
(* report back errors (as Diagnostics) *)
val errors = ErrorMsg.readErrorLog ()
val decls = case List.last res of
(Elab.DStr (_, _, _, (Elab.StrConst decls, _)), _) => decls
| _ => raise Fail ("Impossible: Source.StrConst did not become Elab.StrConst after elaboration")
in
(SOME { decls = decls },
List.map errorToDiagnostic errors)
end
end
fun handleFullDocument (state: state) (toclient: LspSpec.toclient) (documentUri: LspSpec.documentUri) =
let
val path = #path documentUri
val res = calculateFileState state path
in
(case #1 res of
NONE => ()
| SOME fs =>
stateRef := SOME { urpPath = #urpPath state
, fileStates = SM.insert ( #fileStates state
, path
, fs)
}) ;
#publishDiagnostics toclient { uri = documentUri , diagnostics = #2 res}
end
fun serverLoop () =
let
val requestMessage =
LspSpec.readRequestFromStdIO ()
handle ex => (debug (General.exnMessage ex) ; raise ex)
val state = !stateRef
in
case state of
NONE =>
(case requestMessage of
LspSpec.RequestMessage m =>
LspSpec.handleMessage
m
{ initialize = fn _ =>
(let val st = initState (LspSpec.parseInitializeParams (#params m))
in
stateRef := SOME st;
LspSpec.Success
{ capabilities =
{ hoverProvider = true
, textDocumentSync = { openClose = true
, save = SOME { includeText = false }
}}
}
end)
handle (Fail str) => LspSpec.Error (~32602, str)
, shutdown = fn () => LspSpec.Error (~32002, "Server not initialized")
, textDocument_hover = fn ctx => fn _ => LspSpec.Error (~32002, "Server not initialized")
}
| LspSpec.Notification n => ())
| SOME state =>
(case requestMessage of
LspSpec.Notification n =>
((LspSpec.handleNotification
n
{ initialized = fn () => ()
, textDocument_didOpen = fn ctx => fn p => handleFullDocument state ctx (#uri (#textDocument p))
, textDocument_didChange = fn ctx => fn didChangeParams => ()
, textDocument_didSave = fn ctx => fn p => handleFullDocument state ctx (#uri (#textDocument p))
})
handle LspError e => handleLspErrorInNotification e
| ex => handleLspErrorInNotification (InternalError (General.exnMessage ex)))
| LspSpec.RequestMessage m =>
(* TODO should error handling here be inside handleMessage? *)
((LspSpec.handleMessage
m
{ initialize = fn _ => LspSpec.Error (~32600, "Server already initialized")
, shutdown = fn () => LspSpec.Success ()
, textDocument_hover = fn ctx => fn _ => LspSpec.Success NONE
})
handle LspError e => handleLspErrorInRequest (#id m) e
| ex => handleLspErrorInRequest (#id m) (InternalError (General.exnMessage ex)))
)
end
fun startServer () = while true do serverLoop ()
end
|