408 lines
12 KiB
Nim
408 lines
12 KiB
Nim
# lsp_server.nim — Bux Language Server Protocol implementation
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# Communicates via stdin/stdout JSON-RPC 2.0
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#
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# Usage: bux-lsp
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# The editor spawns this binary and communicates via stdin/stdout.
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import std/[json, os, strutils, streams, tables]
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# ---------------------------------------------------------------------------
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# JSON-RPC Transport
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# ---------------------------------------------------------------------------
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proc readMessage(stream: FileStream): JsonNode =
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## Read a single JSON-RPC message from stream.
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## Format: Content-Length: N\r\n\r\n{json}
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var header = ""
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while true:
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var line = ""
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if not stream.readLine(line):
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return nil
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if line == "\r" or line == "":
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break
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header &= line & "\r\n"
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var contentLen = 0
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for hdr in header.split("\r\n"):
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if hdr.toLowerAscii().startsWith("content-length:"):
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try:
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contentLen = parseInt(hdr.split(":")[1].strip())
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except:
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discard
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if contentLen <= 0:
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return nil
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var body = newString(contentLen)
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if stream.readData(addr body[0], contentLen) != contentLen:
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return nil
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try:
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return parseJson(body)
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except:
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return nil
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proc sendMessage(stream: FileStream, msg: JsonNode) =
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let body = $msg
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let header = "Content-Length: " & $body.len & "\r\n\r\n"
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stream.write(header)
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stream.write(body)
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stream.flush()
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proc sendResponse(stream: FileStream, id: JsonNode, resultNode: JsonNode) =
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sendMessage(stream, %*{
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"jsonrpc": "2.0",
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"id": id,
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"result": resultNode
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})
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proc sendError(stream: FileStream, id: JsonNode, code: int, message: string) =
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sendMessage(stream, %*{
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"jsonrpc": "2.0",
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"id": id,
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"error": {"code": code, "message": message}
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})
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proc sendNotification(stream: FileStream, methodName: string, paramsNode: JsonNode) =
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sendMessage(stream, %*{
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"jsonrpc": "2.0",
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"method": methodName,
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"params": paramsNode
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})
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# ---------------------------------------------------------------------------
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# Document state
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# ---------------------------------------------------------------------------
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type
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SymbolInfo = tuple[line: int, col: int, kind: string, typeName: string]
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DocumentState = ref object
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uri: string
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content: string
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version: int
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symbols: Table[string, SymbolInfo]
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var
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documents = initTable[string, DocumentState]()
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rootPath = ""
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rootUri = ""
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proc getDoc(uri: string): DocumentState =
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if not documents.hasKey(uri):
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documents[uri] = DocumentState(uri: uri)
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return documents[uri]
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# ---------------------------------------------------------------------------
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# File path from URI
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# ---------------------------------------------------------------------------
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proc uriToPath(uri: string): string =
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if uri.startsWith("file://"):
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result = uri[7..^1]
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else:
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result = uri
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# ---------------------------------------------------------------------------
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# Simple analysis: extract symbols via regex (no full compiler integration yet)
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# ---------------------------------------------------------------------------
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proc analyzeFile(path: string, content: string): DocumentState =
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result = DocumentState(uri: "file://" & path, content: content)
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# Simple symbol extraction: find func/var/let/struct/enum declarations
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var idx = 0
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var line = 0
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var col = 0
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for ch in content:
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if ch == '\n':
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line += 1
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col = 0
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idx += 1
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continue
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col += 1
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idx += 1
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# Use string-based pattern matching for common Bux declarations
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var i = 0
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var currLine = 0
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var currCol = 0
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while i < content.len:
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let c = content[i]
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if c == '\n':
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currLine += 1
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currCol = 0
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i += 1
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continue
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currCol += 1
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# Match "func Name"
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if content[i..min(i+4, content.len-1)] == "func ":
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var start = i + 5
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var name = ""
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while start < content.len and content[start] in {'a'..'z', 'A'..'Z', '0'..'9', '_'}:
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name &= content[start]
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start += 1
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if name != "":
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result.symbols[name] = (line: currLine, col: currCol + 5, kind: "function", typeName: "")
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i = start
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continue
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# Match "var Name" or "let Name"
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if i + 3 < content.len and (content[i..i+2] == "var " or content[i..i+2] == "let "):
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let kwEnd = if content[i] == 'v': i + 4 else: i + 4
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var name = ""
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var start = kwEnd
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while start < content.len and content[start] in {'a'..'z', 'A'..'Z', '0'..'9', '_'}:
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name &= content[start]
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start += 1
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if name != "" and name != "":
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result.symbols[name] = (line: currLine, col: currCol + kwEnd - i, kind: "variable", typeName: "")
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i = start
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continue
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# Match "struct Name"
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if i + 6 < content.len and content[i..i+5] == "struct ":
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var name = ""
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var start = i + 7
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while start < content.len and content[start] in {'a'..'z', 'A'..'Z', '0'..'9', '_'}:
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name &= content[start]
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start += 1
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if name != "":
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result.symbols[name] = (line: currLine, col: currCol + 7, kind: "struct", typeName: "")
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i = start
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continue
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i += 1
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# ---------------------------------------------------------------------------
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# Diagnostics (placeholder — emits empty diagnostics)
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# ---------------------------------------------------------------------------
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proc publishDiagnostics(stream: FileStream, uri: string) =
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sendNotification(stream, "textDocument/publishDiagnostics", %*{
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"uri": uri,
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"diagnostics": []
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})
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proc analyzeAndPublishDiagnostics(stream: FileStream, doc: DocumentState) =
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let updated = analyzeFile(uriToPath(doc.uri), doc.content)
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doc.symbols = updated.symbols
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publishDiagnostics(stream, doc.uri)
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# ---------------------------------------------------------------------------
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# Completion
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# ---------------------------------------------------------------------------
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proc findWordAt(content: string, lineNum: int, col: int): string =
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var lines = content.split("\n")
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if lineNum >= lines.len: return ""
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let l = lines[lineNum]
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var start = col
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var endC = col
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while start > 0 and l[start-1] in {'a'..'z', 'A'..'Z', '0'..'9', '_'}:
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start -= 1
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while endC < l.len and l[endC] in {'a'..'z', 'A'..'Z', '0'..'9', '_'}:
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endC += 1
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if start < endC:
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result = l[start..endC-1]
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proc handleCompletion(stream: FileStream, id: JsonNode, paramsNode: JsonNode) =
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let uri = paramsNode["textDocument"]["uri"].getStr()
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let position = paramsNode["position"]
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let lineNum = position["line"].getInt()
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let col = position["character"].getInt()
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let doc = getDoc(uri)
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if doc.content == "":
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sendResponse(stream, id, %*{"isIncomplete": false, "items": []})
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return
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if doc.symbols.len == 0:
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let updated = analyzeFile(uriToPath(uri), doc.content)
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doc.symbols = updated.symbols
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let prefix = findWordAt(doc.content, lineNum, col)
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var items = newJArray()
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for name, info in doc.symbols.pairs:
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if prefix == "" or name.toLowerAscii().startsWith(prefix.toLowerAscii()):
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items.add(%*{
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"label": name,
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"kind": 6,
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"detail": info.typeName,
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"documentation": info.kind & " [" & info.typeName & "]"
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})
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let keywords = ["func", "var", "let", "if", "else", "while", "for", "return",
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"struct", "enum", "union", "interface", "extend", "module",
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"import", "true", "false", "null", "self", "match", "break",
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"continue", "async", "await", "spawn", "const", "type"]
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for kw in keywords:
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if prefix == "" or kw.startsWith(prefix):
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items.add(%*{
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"label": kw,
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"kind": 14,
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"detail": "keyword"
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})
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sendResponse(stream, id, %*{"isIncomplete": false, "items": items})
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# ---------------------------------------------------------------------------
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# Go-to-definition
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# ---------------------------------------------------------------------------
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proc handleDefinition(stream: FileStream, id: JsonNode, paramsNode: JsonNode) =
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let uri = paramsNode["textDocument"]["uri"].getStr()
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let position = paramsNode["position"]
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let lineNum = position["line"].getInt()
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let col = position["character"].getInt()
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let doc = getDoc(uri)
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if doc.content == "":
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sendResponse(stream, id, %*[])
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return
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if doc.symbols.len == 0:
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let updated = analyzeFile(uriToPath(uri), doc.content)
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doc.symbols = updated.symbols
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let word = findWordAt(doc.content, lineNum, col)
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if doc.symbols.hasKey(word):
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let info = doc.symbols[word]
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var locs = newJArray()
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locs.add(%*{
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"uri": uri,
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"range": {
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"start": {"line": info.line, "character": info.col},
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"end": {"line": info.line, "character": info.col + word.len}
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}
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})
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sendResponse(stream, id, locs)
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else:
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sendResponse(stream, id, %*[])
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# ---------------------------------------------------------------------------
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# Hover
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# ---------------------------------------------------------------------------
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proc handleHover(stream: FileStream, id: JsonNode, paramsNode: JsonNode) =
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let uri = paramsNode["textDocument"]["uri"].getStr()
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let position = paramsNode["position"]
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let lineNum = position["line"].getInt()
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let col = position["character"].getInt()
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let doc = getDoc(uri)
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if doc.content == "":
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sendResponse(stream, id, %*{})
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return
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if doc.symbols.len == 0:
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let updated = analyzeFile(uriToPath(uri), doc.content)
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doc.symbols = updated.symbols
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let word = findWordAt(doc.content, lineNum, col)
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if doc.symbols.hasKey(word):
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let info = doc.symbols[word]
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sendResponse(stream, id, %*{
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"contents": {
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"kind": "markdown",
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"value": "**" & word & "**: " & info.typeName & "\n\n" & info.kind
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}
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})
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else:
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sendResponse(stream, id, %*{})
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# ---------------------------------------------------------------------------
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# Main message loop
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# ---------------------------------------------------------------------------
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proc handleMessage(stream: FileStream, msg: JsonNode) =
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if not msg.hasKey("method"):
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return
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let methodName = msg["method"].getStr()
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let id = if msg.hasKey("id"): msg["id"] else: nil
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let paramsNode = if msg.hasKey("params"): msg["params"] else: %*{}
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case methodName:
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of "initialize":
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sendResponse(stream, id, %*{
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"capabilities": {
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"textDocumentSync": 1,
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"completionProvider": {"triggerCharacters": ["."]},
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"definitionProvider": true,
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"hoverProvider": true
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},
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"serverInfo": {"name": "bux-lsp", "version": "0.1.0"}
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})
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if paramsNode.hasKey("rootPath") and paramsNode["rootPath"].kind != JNull:
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rootPath = paramsNode["rootPath"].getStr()
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if paramsNode.hasKey("rootUri") and paramsNode["rootUri"].kind != JNull:
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rootUri = paramsNode["rootUri"].getStr()
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of "initialized":
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discard
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of "shutdown":
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sendResponse(stream, id, %*{})
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of "exit":
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quit(0)
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of "textDocument/didOpen":
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let td = paramsNode["textDocument"]
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let uri = td["uri"].getStr()
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let content = td["text"].getStr()
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var doc = getDoc(uri)
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doc.content = content
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if td.hasKey("version"):
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doc.version = td["version"].getInt()
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analyzeAndPublishDiagnostics(stream, doc)
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of "textDocument/didChange":
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let td = paramsNode["textDocument"]
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let uri = td["uri"].getStr()
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var doc = getDoc(uri)
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let changes = paramsNode["contentChanges"]
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if changes.len > 0:
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doc.content = changes[changes.len - 1]["text"].getStr()
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if td.hasKey("version"):
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doc.version = td["version"].getInt()
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of "textDocument/didSave":
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let td = paramsNode["textDocument"]
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let uri = td["uri"].getStr()
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let doc = getDoc(uri)
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analyzeAndPublishDiagnostics(stream, doc)
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of "textDocument/completion":
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handleCompletion(stream, id, paramsNode)
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of "textDocument/definition":
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handleDefinition(stream, id, paramsNode)
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of "textDocument/hover":
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handleHover(stream, id, paramsNode)
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else:
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if id != nil:
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sendError(stream, id, -32601, "method not found: " & methodName)
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# ---------------------------------------------------------------------------
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# Entry point
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# ---------------------------------------------------------------------------
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proc main() =
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let stream = newFileStream(stdin)
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while true:
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let msg = readMessage(stream)
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if msg == nil:
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break
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handleMessage(stream, msg)
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when isMainModule:
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main()
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