def IO.FS.Stream.readUTF8 (h : Stream) (nBytes : Nat) : IO String

Equations

• h.readUTF8 nBytes = do let bytes ← h.read (USize.ofNat nBytes) match String.fromUTF8? bytes with | some s => pure s | x => throw (IO.userError "invalid UTF-8")

def IO.FS.Stream.readJson (h : Stream) (nBytes : Nat) : IO Lean.Json

Consumes nBytes bytes from the stream, interprets the bytes as a utf-8 string and the string as a valid JSON object.

Equations

• h.readJson nBytes = do let bytes ← h.read (USize.ofNat nBytes) match String.fromUTF8? bytes with | some s => IO.ofExcept (Lean.Json.parse s) | x => throw (IO.userError "invalid UTF-8")

def IO.FS.Stream.writeJson (h : Stream) (j : Lean.Json) : IO Unit

Equations

• h.writeJson j = do h.putStr j.compress h.flush