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# Handers for execute_request and related messages, which are
# the core of the Jupyter protocol: execution of Julia code and
# returning results.
import Base.Libc: flush_cstdio
import Pkg
# global variable so that display can be done in the correct Msg context
execute_msg = Msg(["julia"], Dict("username"=>"jlkernel", "session"=>uuid4()), Dict())
# global variable tracking the number of bytes written in the current execution
# request
const stdio_bytes = Ref(0)
import REPL: helpmode
# use a global array to accumulate "payloads" for the execute_reply message
const execute_payloads = Dict[]
function execute_request(socket, msg)
code = msg.content["code"]
@vprintln("EXECUTING", code)
global execute_msg = msg
global n, In, Out, ans
stdio_bytes[] = 0
silent = msg.content["silent"]
store_history = get(msg.content, "store_history", !silent)
empty!(execute_payloads)
if !silent
n += 1
send_ipython(publish[],
msg_pub(msg, "execute_input",
Dict("execution_count" => n,
"code" => code)))
end
silent = silent || REPL.ends_with_semicolon(code)
if store_history
In[n] = code
end
# "; ..." cells are interpreted as shell commands for run
code = replace(code, r"^\s*;.*$" =>
m -> string(replace(m, r"^\s*;" => "Base.repl_cmd(`"),
"`, stdout)"))
# "] ..." cells are interpreted as pkg shell commands
if occursin(r"^\].*$", code)
code = "IJulia.Pkg.REPLMode.do_cmd(IJulia.minirepl[], \"" *
escape_string(code[2:end]) * "\"; do_rethrow=true)"
end
# a cell beginning with "? ..." is interpreted as a help request
hcode = replace(code, r"^\s*\?" => "")
try
for hook in preexecute_hooks
invokelatest(hook)
end
ans = result = if hcode != code # help request
Core.eval(Main, helpmode(hcode))
else
#run the code!
occursin(magics_regex, code) && match(magics_regex, code).offset == 1 ? magics_help(code) :
SOFTSCOPE[] ? softscope_include_string(current_module[], code, "In[$n]") :
include_string(current_module[], code, "In[$n]")
end
if silent
result = nothing
elseif result !== nothing
if store_history
Out[n] = result
end
end
user_expressions = Dict()
for (v,ex) in msg.content["user_expressions"]
try
value = include_string(current_module[], ex)
# Like the IPython reference implementation, we return
# something that looks like a `display_data` but also has a
# `status` field:
# https://github.com/ipython/ipython/blob/master/IPython/core/interactiveshell.py#L2609-L2614
user_expressions[v] = Dict("status" => "ok",
"data" => display_dict(value),
"metadata" => metadata(value))
catch e
# The format of user_expressions[v] is like `error` except that
# it also has a `status` field:
# https://jupyter-client.readthedocs.io/en/stable/messaging.html#execution-errors
user_expressions[v] = Dict("status" => "error",
error_content(e, catch_backtrace())...)
end
end
for hook in postexecute_hooks
invokelatest(hook)
end
# flush pending stdio
flush_all()
undisplay(result) # dequeue if needed, since we display result in pyout
invokelatest(display) # flush pending display requests
if result !== nothing
result_metadata = invokelatest(metadata, result)
result_data = invokelatest(display_dict, result)
send_ipython(publish[],
msg_pub(msg, "execute_result",
Dict("execution_count" => n,
"metadata" => result_metadata,
"data" => result_data)))
end
send_ipython(requests[],
msg_reply(msg, "execute_reply",
Dict("status" => "ok",
"payload" => execute_payloads,
"execution_count" => n,
"user_expressions" => user_expressions)))
empty!(execute_payloads)
catch e
bt = catch_backtrace()
try
# flush pending stdio
flush_all()
for hook in posterror_hooks
invokelatest(hook)
end
catch
end
empty!(displayqueue) # discard pending display requests on an error
content = error_content(e,bt)
send_ipython(publish[], msg_pub(msg, "error", content))
content["status"] = "error"
content["execution_count"] = n
send_ipython(requests[], msg_reply(msg, "execute_reply", content))
end
end
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