https://github.com/JuliaLang/julia
Tip revision: affe96a42f3ac5f36af70671453babdd58578c9e authored by Milan Bouchet-Valat on 17 January 2021, 17:30:37 UTC
Simplify computation of return type in broadcast
Simplify computation of return type in broadcast
Tip revision: affe96a
client.jl
# This file is a part of Julia. License is MIT: https://julialang.org/license
## client.jl - frontend handling command line options, environment setup,
## and REPL
have_color = nothing
const default_color_warn = :yellow
const default_color_error = :light_red
const default_color_info = :cyan
const default_color_debug = :blue
const default_color_input = :normal
const default_color_answer = :normal
const color_normal = text_colors[:normal]
function repl_color(key, default)
env_str = get(ENV, key, "")
c = tryparse(Int, env_str)
c_conv = something(c, Symbol(env_str))
haskey(text_colors, c_conv) ? c_conv : default
end
error_color() = repl_color("JULIA_ERROR_COLOR", default_color_error)
warn_color() = repl_color("JULIA_WARN_COLOR" , default_color_warn)
info_color() = repl_color("JULIA_INFO_COLOR" , default_color_info)
debug_color() = repl_color("JULIA_DEBUG_COLOR" , default_color_debug)
input_color() = text_colors[repl_color("JULIA_INPUT_COLOR", default_color_input)]
answer_color() = text_colors[repl_color("JULIA_ANSWER_COLOR", default_color_answer)]
stackframe_lineinfo_color() = repl_color("JULIA_STACKFRAME_LINEINFO_COLOR", :bold)
stackframe_function_color() = repl_color("JULIA_STACKFRAME_FUNCTION_COLOR", :bold)
function repl_cmd(cmd, out)
shell = shell_split(get(ENV, "JULIA_SHELL", get(ENV, "SHELL", "/bin/sh")))
shell_name = Base.basename(shell[1])
# Immediately expand all arguments, so that typing e.g. ~/bin/foo works.
cmd.exec .= expanduser.(cmd.exec)
if isempty(cmd.exec)
throw(ArgumentError("no cmd to execute"))
elseif cmd.exec[1] == "cd"
new_oldpwd = pwd()
if length(cmd.exec) > 2
throw(ArgumentError("cd method only takes one argument"))
elseif length(cmd.exec) == 2
dir = cmd.exec[2]
if dir == "-"
if !haskey(ENV, "OLDPWD")
error("cd: OLDPWD not set")
end
dir = ENV["OLDPWD"]
end
cd(dir)
else
cd()
end
ENV["OLDPWD"] = new_oldpwd
println(out, pwd())
else
@static if !Sys.iswindows()
if shell_name == "fish"
shell_escape_cmd = "begin; $(shell_escape_posixly(cmd)); and true; end"
else
shell_escape_cmd = "($(shell_escape_posixly(cmd))) && true"
end
cmd = `$shell -c $shell_escape_cmd`
end
run(ignorestatus(cmd))
end
nothing
end
# deprecated function--preserved for DocTests.jl
function ip_matches_func(ip, func::Symbol)
for fr in StackTraces.lookup(ip)
if fr === StackTraces.UNKNOWN || fr.from_c
return false
end
fr.func === func && return true
end
return false
end
function scrub_repl_backtrace(bt)
if bt !== nothing && !(bt isa Vector{Any}) # ignore our sentinel value types
bt = stacktrace(bt)
# remove REPL-related frames from interactive printing
eval_ind = findlast(frame -> !frame.from_c && frame.func === :eval, bt)
eval_ind === nothing || deleteat!(bt, eval_ind:length(bt))
end
return bt
end
function display_error(io::IO, er, bt)
printstyled(io, "ERROR: "; bold=true, color=Base.error_color())
bt = scrub_repl_backtrace(bt)
showerror(IOContext(io, :limit => true), er, bt, backtrace = bt!==nothing)
println(io)
end
function display_error(io::IO, stack::Vector)
printstyled(io, "ERROR: "; bold=true, color=Base.error_color())
bt = Any[ (x[1], scrub_repl_backtrace(x[2])) for x in stack ]
show_exception_stack(IOContext(io, :limit => true), bt)
println(io)
end
display_error(stack::Vector) = display_error(stderr, stack)
display_error(er, bt=nothing) = display_error(stderr, er, bt)
function eval_user_input(errio, @nospecialize(ast), show_value::Bool)
errcount = 0
lasterr = nothing
have_color = get(stdout, :color, false)::Bool
while true
try
if have_color
print(color_normal)
end
if lasterr !== nothing
invokelatest(display_error, errio, lasterr)
errcount = 0
lasterr = nothing
else
ast = Meta.lower(Main, ast)
value = Core.eval(Main, ast)
ccall(:jl_set_global, Cvoid, (Any, Any, Any), Main, :ans, value)
if !(value === nothing) && show_value
if have_color
print(answer_color())
end
try
invokelatest(display, value)
catch
@error "Evaluation succeeded, but an error occurred while displaying the value" typeof(value)
rethrow()
end
println()
end
end
break
catch
if errcount > 0
@error "SYSTEM: display_error(errio, lasterr) caused an error"
end
errcount += 1
lasterr = catch_stack()
if errcount > 2
@error "It is likely that something important is broken, and Julia will not be able to continue normally" errcount
break
end
end
end
isa(stdin, TTY) && println()
nothing
end
function _parse_input_line_core(s::String, filename::String)
ex = Meta.parseall(s, filename=filename)
if ex isa Expr && ex.head === :toplevel
if isempty(ex.args)
return nothing
end
last = ex.args[end]
if last isa Expr && (last.head === :error || last.head === :incomplete)
# if a parse error happens in the middle of a multi-line input
# return only the error, so that none of the input is evaluated.
return last
end
end
return ex
end
function parse_input_line(s::String; filename::String="none", depwarn=true)
# For now, assume all parser warnings are depwarns
ex = if depwarn
_parse_input_line_core(s, filename)
else
with_logger(NullLogger()) do
_parse_input_line_core(s, filename)
end
end
return ex
end
parse_input_line(s::AbstractString) = parse_input_line(String(s))
# detect the reason which caused an :incomplete expression
# from the error message
# NOTE: the error messages are defined in src/julia-parser.scm
incomplete_tag(ex) = :none
function incomplete_tag(ex::Expr)
Meta.isexpr(ex, :incomplete) || return :none
msg = ex.args[1]
occursin("string", msg) && return :string
occursin("comment", msg) && return :comment
occursin("requires end", msg) && return :block
occursin("\"`\"", msg) && return :cmd
occursin("character", msg) && return :char
return :other
end
# call include() on a file, ignoring if not found
include_ifexists(mod::Module, path::AbstractString) = isfile(path) && include(mod, path)
function exec_options(opts)
if !isempty(ARGS)
idxs = findall(x -> x == "--", ARGS)
length(idxs) > 0 && deleteat!(ARGS, idxs[1])
end
quiet = (opts.quiet != 0)
startup = (opts.startupfile != 2)
history_file = (opts.historyfile != 0)
color_set = (opts.color != 0) # --color!=auto
global have_color = color_set ? (opts.color == 1) : nothing # --color=on
global is_interactive = (opts.isinteractive != 0)
# pre-process command line argument list
arg_is_program = !isempty(ARGS)
repl = !arg_is_program
cmds = unsafe_load_commands(opts.commands)
for (cmd, arg) in cmds
if cmd == 'e'
arg_is_program = false
repl = false
elseif cmd == 'E'
arg_is_program = false
repl = false
elseif cmd == 'L'
# nothing
elseif cmd == 'B' # --bug-report
# If we're doing a bug report, don't load anything else. We will
# spawn a child in which to execute these options.
let InteractiveUtils = load_InteractiveUtils()
InteractiveUtils.report_bug(arg)
end
return nothing
else
@warn "Unexpected command -$cmd'$arg'"
end
end
# remove filename from ARGS
global PROGRAM_FILE = arg_is_program ? popfirst!(ARGS) : ""
# Load Distributed module only if any of the Distributed options have been specified.
distributed_mode = (opts.worker == 1) || (opts.nprocs > 0) || (opts.machine_file != C_NULL)
if distributed_mode
let Distributed = require(PkgId(UUID((0x8ba89e20_285c_5b6f, 0x9357_94700520ee1b)), "Distributed"))
Core.eval(Main, :(const Distributed = $Distributed))
Core.eval(Main, :(using .Distributed))
end
invokelatest(Main.Distributed.process_opts, opts)
end
# load ~/.julia/config/startup.jl file
if startup
try
load_julia_startup()
catch
invokelatest(display_error, catch_stack())
!(repl || is_interactive) && exit(1)
end
end
# process cmds list
for (cmd, arg) in cmds
if cmd == 'e'
Core.eval(Main, parse_input_line(arg))
elseif cmd == 'E'
invokelatest(show, Core.eval(Main, parse_input_line(arg)))
println()
elseif cmd == 'L'
# load file immediately on all processors
if !distributed_mode
include(Main, arg)
else
# TODO: Move this logic to Distributed and use a callback
@sync for p in invokelatest(Main.procs)
@async invokelatest(Main.remotecall_wait, include, p, Main, arg)
end
end
end
end
# load file
if arg_is_program
# program
if !is_interactive::Bool
exit_on_sigint(true)
end
try
include(Main, PROGRAM_FILE)
catch
invokelatest(display_error, catch_stack())
if !is_interactive::Bool
exit(1)
end
end
end
repl |= is_interactive::Bool
if repl
interactiveinput = isa(stdin, TTY)
if interactiveinput
global is_interactive = true
banner = (opts.banner != 0) # --banner!=no
else
banner = (opts.banner == 1) # --banner=yes
end
run_main_repl(interactiveinput, quiet, banner, history_file, color_set)
end
nothing
end
function load_julia_startup()
# If the user built us with a specific Base.SYSCONFDIR, check that location first for a startup.jl file
# If it is not found, then continue on to the relative path based on Sys.BINDIR
BINDIR = Sys.BINDIR::String
SYSCONFDIR = Base.SYSCONFDIR::String
if !isempty(SYSCONFDIR) && isfile(joinpath(BINDIR, SYSCONFDIR, "julia", "startup.jl"))
include(Main, abspath(BINDIR, SYSCONFDIR, "julia", "startup.jl"))
else
include_ifexists(Main, abspath(BINDIR, "..", "etc", "julia", "startup.jl"))
end
!isempty(DEPOT_PATH) && include_ifexists(Main, abspath(DEPOT_PATH[1], "config", "startup.jl"))
return nothing
end
const repl_hooks = []
"""
atreplinit(f)
Register a one-argument function to be called before the REPL interface is initialized in
interactive sessions; this is useful to customize the interface. The argument of `f` is the
REPL object. This function should be called from within the `.julia/config/startup.jl`
initialization file.
"""
atreplinit(f::Function) = (pushfirst!(repl_hooks, f); nothing)
function __atreplinit(repl)
for f in repl_hooks
try
f(repl)
catch err
showerror(stderr, err)
println(stderr)
end
end
end
_atreplinit(repl) = invokelatest(__atreplinit, repl)
# The REPL stdlib hooks into Base using this Ref
const REPL_MODULE_REF = Ref{Module}()
function load_InteractiveUtils()
# load interactive-only libraries
if !isdefined(Main, :InteractiveUtils)
try
let InteractiveUtils = require(PkgId(UUID(0xb77e0a4c_d291_57a0_90e8_8db25a27a240), "InteractiveUtils"))
Core.eval(Main, :(const InteractiveUtils = $InteractiveUtils))
Core.eval(Main, :(using .InteractiveUtils))
return InteractiveUtils
end
catch ex
@warn "Failed to import InteractiveUtils into module Main" exception=(ex, catch_backtrace())
end
return nothing
end
return getfield(Main, :InteractiveUtils)
end
# run the requested sort of evaluation loop on stdio
function run_main_repl(interactive::Bool, quiet::Bool, banner::Bool, history_file::Bool, color_set::Bool)
global active_repl
load_InteractiveUtils()
if interactive && isassigned(REPL_MODULE_REF)
invokelatest(REPL_MODULE_REF[]) do REPL
term_env = get(ENV, "TERM", @static Sys.iswindows() ? "" : "dumb")
term = REPL.Terminals.TTYTerminal(term_env, stdin, stdout, stderr)
banner && Base.banner(term)
if term.term_type == "dumb"
active_repl = REPL.BasicREPL(term)
quiet || @warn "Terminal not fully functional"
else
active_repl = REPL.LineEditREPL(term, get(stdout, :color, false), true)
active_repl.history_file = history_file
end
# Make sure any displays pushed in .julia/config/startup.jl ends up above the
# REPLDisplay
pushdisplay(REPL.REPLDisplay(active_repl))
_atreplinit(active_repl)
REPL.run_repl(active_repl, backend->(global active_repl_backend = backend))
end
else
# otherwise provide a simple fallback
if interactive && !quiet
@warn "REPL provider not available: using basic fallback"
end
banner && Base.banner()
let input = stdin
if isa(input, File) || isa(input, IOStream)
# for files, we can slurp in the whole thing at once
ex = parse_input_line(read(input, String))
if Meta.isexpr(ex, :toplevel)
# if we get back a list of statements, eval them sequentially
# as if we had parsed them sequentially
for stmt in ex.args
eval_user_input(stderr, stmt, true)
end
body = ex.args
else
eval_user_input(stderr, ex, true)
end
else
while isopen(input) || !eof(input)
if interactive
print("julia> ")
flush(stdout)
end
try
line = ""
ex = nothing
while !eof(input)
line *= readline(input, keep=true)
ex = parse_input_line(line)
if !(isa(ex, Expr) && ex.head === :incomplete)
break
end
end
eval_user_input(stderr, ex, true)
catch err
isa(err, InterruptException) ? print("\n\n") : rethrow()
end
end
end
end
end
nothing
end
# MainInclude exists to hide Main.include and eval from `names(Main)`.
baremodule MainInclude
using ..Base
# These definitions calls Base._include rather than Base.include to get
# one-frame stacktraces for the common case of using include(fname) in Main.
include(mapexpr::Function, fname::AbstractString) = Base._include(mapexpr, Main, fname)
function include(fname::AbstractString)
isa(fname, String) || (fname = Base.convert(String, fname)::String)
Base._include(identity, Main, fname)
end
eval(x) = Core.eval(Main, x)
end
"""
eval(expr)
Evaluate an expression in the global scope of the containing module.
Every `Module` (except those defined with `baremodule`) has its own 1-argument
definition of `eval`, which evaluates expressions in that module.
"""
MainInclude.eval
"""
include([mapexpr::Function,] path::AbstractString)
Evaluate the contents of the input source file in the global scope of the containing module.
Every module (except those defined with `baremodule`) has its own
definition of `include`, which evaluates the file in that module.
Returns the result of the last evaluated expression of the input file. During including,
a task-local include path is set to the directory containing the file. Nested calls to
`include` will search relative to that path. This function is typically used to load source
interactively, or to combine files in packages that are broken into multiple source files.
The optional first argument `mapexpr` can be used to transform the included code before
it is evaluated: for each parsed expression `expr` in `path`, the `include` function
actually evaluates `mapexpr(expr)`. If it is omitted, `mapexpr` defaults to [`identity`](@ref).
Use [`Base.include`](@ref) to evaluate a file into another module.
"""
MainInclude.include
function _start()
empty!(ARGS)
append!(ARGS, Core.ARGS)
if ccall(:jl_generating_output, Cint, ()) != 0 && JLOptions().incremental == 0
# clear old invalid pointers
PCRE.__init__()
end
try
exec_options(JLOptions())
catch
invokelatest(display_error, catch_stack())
exit(1)
end
if is_interactive && get(stdout, :color, false)
print(color_normal)
end
end