https://github.com/JuliaLang/julia
Tip revision: 29bc2acd945e74a067d2904c59ab461a1a145e26 authored by Tony Kelman on 28 February 2017, 13:15:45 UTC
feature freeze master for 0.6-pre (#20762)
feature freeze master for 0.6-pre (#20762)
Tip revision: 29bc2ac
REPL.jl
# This file is a part of Julia. License is MIT: http://julialang.org/license
module REPL
using Base.Meta
using ..Terminals
using ..LineEdit
using ..REPLCompletions
export
BasicREPL,
LineEditREPL,
StreamREPL
import Base:
Display,
display,
show,
AnyDict,
==
import ..LineEdit:
CompletionProvider,
HistoryProvider,
add_history,
complete_line,
history_next,
history_next_prefix,
history_prev,
history_prev_prefix,
history_search,
accept_result,
terminal
abstract type AbstractREPL end
answer_color(::AbstractREPL) = ""
const JULIA_PROMPT = "julia> "
mutable struct REPLBackend
"channel for AST"
repl_channel::Channel
"channel for results: (value, nothing) or (error, backtrace)"
response_channel::Channel
"flag indicating the state of this backend"
in_eval::Bool
"current backend task"
backend_task::Task
REPLBackend(repl_channel, response_channel, in_eval) =
new(repl_channel, response_channel, in_eval)
end
function eval_user_input(ast::ANY, backend::REPLBackend)
iserr, lasterr = false, ((), nothing)
Base.sigatomic_begin()
while true
try
Base.sigatomic_end()
if iserr
put!(backend.response_channel, lasterr)
iserr, lasterr = false, ()
else
backend.in_eval = true
value = eval(Main, ast)
backend.in_eval = false
# note: value wrapped in a closure to ensure it doesn't get passed through expand
eval(Main, Expr(:body, Expr(:(=), :ans, QuoteNode(value)), Expr(:return, nothing)))
put!(backend.response_channel, (value, nothing))
end
break
catch err
if iserr
println("SYSTEM ERROR: Failed to report error to REPL frontend")
println(err)
end
iserr, lasterr = true, (err, catch_backtrace())
end
end
Base.sigatomic_end()
end
function start_repl_backend(repl_channel::Channel, response_channel::Channel)
backend = REPLBackend(repl_channel, response_channel, false)
backend.backend_task = @schedule begin
# include looks at this to determine the relative include path
# nothing means cwd
while true
tls = task_local_storage()
tls[:SOURCE_PATH] = nothing
ast, show_value = take!(backend.repl_channel)
if show_value == -1
# exit flag
break
end
eval_user_input(ast, backend)
end
end
backend
end
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
struct REPLDisplay{R<:AbstractREPL} <: Display
repl::R
end
==(a::REPLDisplay, b::REPLDisplay) = a.repl === b.repl
function display(d::REPLDisplay, mime::MIME"text/plain", x)
io = outstream(d.repl)
Base.have_color && write(io, answer_color(d.repl))
show(IOContext(io, :limit => true), mime, x)
println(io)
end
display(d::REPLDisplay, x) = display(d, MIME("text/plain"), x)
function print_response(repl::AbstractREPL, val::ANY, bt, show_value::Bool, have_color::Bool)
repl.waserror = bt !== nothing
print_response(outstream(repl), val, bt, show_value, have_color, specialdisplay(repl))
end
function print_response(errio::IO, val::ANY, bt, show_value::Bool, have_color::Bool, specialdisplay=nothing)
Base.sigatomic_begin()
while true
try
Base.sigatomic_end()
if bt !== nothing
eval(Main, Expr(:body, Expr(:return, Expr(:call, Base.display_error,
errio, QuoteNode(val), bt))))
iserr, lasterr = false, ()
else
if val !== nothing && show_value
try
if specialdisplay === nothing
eval(Main, Expr(:body, Expr(:return, Expr(:call, display, QuoteNode(val)))))
else
eval(Main, Expr(:body, Expr(:return, Expr(:call, specialdisplay, QuoteNode(val)))))
end
catch err
println(errio, "Error showing value of type ", typeof(val), ":")
rethrow(err)
end
end
end
break
catch err
if bt !== nothing
println(errio, "SYSTEM: show(lasterr) caused an error")
println(errio, err)
Base.show_backtrace(errio, bt)
break
end
val = err
bt = catch_backtrace()
end
end
Base.sigatomic_end()
end
# A reference to a backend
struct REPLBackendRef
repl_channel::Channel
response_channel::Channel
end
function run_repl(repl::AbstractREPL, consumer = x->nothing)
repl_channel = Channel(1)
response_channel = Channel(1)
backend = start_repl_backend(repl_channel, response_channel)
consumer(backend)
run_frontend(repl, REPLBackendRef(repl_channel,response_channel))
return backend
end
## BasicREPL ##
mutable struct BasicREPL <: AbstractREPL
terminal::TextTerminal
waserror::Bool
BasicREPL(t) = new(t,false)
end
outstream(r::BasicREPL) = r.terminal
function run_frontend(repl::BasicREPL, backend::REPLBackendRef)
d = REPLDisplay(repl)
dopushdisplay = !in(d,Base.Multimedia.displays)
dopushdisplay && pushdisplay(d)
repl_channel, response_channel = backend.repl_channel, backend.response_channel
hit_eof = false
while true
Base.reseteof(repl.terminal)
write(repl.terminal, JULIA_PROMPT)
line = ""
ast = nothing
interrupted = false
while true
try
line *= readline(repl.terminal, chomp=false)
catch e
if isa(e,InterruptException)
try # raise the debugger if present
ccall(:jl_raise_debugger, Int, ())
end
line = ""
interrupted = true
break
elseif isa(e,EOFError)
hit_eof = true
break
else
rethrow()
end
end
ast = Base.parse_input_line(line)
(isa(ast,Expr) && ast.head == :incomplete) || break
end
if !isempty(line)
put!(repl_channel, (ast, 1))
val, bt = take!(response_channel)
if !ends_with_semicolon(line)
print_response(repl, val, bt, true, false)
end
end
write(repl.terminal, '\n')
((!interrupted && isempty(line)) || hit_eof) && break
end
# terminate backend
put!(repl_channel, (nothing, -1))
dopushdisplay && popdisplay(d)
end
## LineEditREPL ##
mutable struct LineEditREPL <: AbstractREPL
t::TextTerminal
hascolor::Bool
prompt_color::String
input_color::String
answer_color::String
shell_color::String
help_color::String
history_file::Bool
in_shell::Bool
in_help::Bool
envcolors::Bool
waserror::Bool
specialdisplay
interface
backendref::REPLBackendRef
LineEditREPL(t,hascolor,prompt_color,input_color,answer_color,shell_color,help_color,history_file,in_shell,in_help,envcolors) =
new(t,true,prompt_color,input_color,answer_color,shell_color,help_color,history_file,in_shell,
in_help,envcolors,false,nothing)
end
outstream(r::LineEditREPL) = r.t
specialdisplay(r::LineEditREPL) = r.specialdisplay
specialdisplay(r::AbstractREPL) = nothing
terminal(r::LineEditREPL) = r.t
LineEditREPL(t::TextTerminal, envcolors = false) = LineEditREPL(t,
true,
Base.text_colors[:light_green],
Base.input_color(),
Base.answer_color(),
Base.text_colors[:red],
Base.text_colors[:yellow],
false, false, false, envcolors)
mutable struct REPLCompletionProvider <: CompletionProvider; end
mutable struct ShellCompletionProvider <: CompletionProvider; end
struct LatexCompletions <: CompletionProvider; end
beforecursor(buf::IOBuffer) = String(buf.data[1:buf.ptr-1])
function complete_line(c::REPLCompletionProvider, s)
partial = beforecursor(s.input_buffer)
full = LineEdit.input_string(s)
ret, range, should_complete = completions(full, endof(partial))
return ret, partial[range], should_complete
end
function complete_line(c::ShellCompletionProvider, s)
# First parse everything up to the current position
partial = beforecursor(s.input_buffer)
full = LineEdit.input_string(s)
ret, range, should_complete = shell_completions(full, endof(partial))
return ret, partial[range], should_complete
end
function complete_line(c::LatexCompletions, s)
partial = beforecursor(LineEdit.buffer(s))
full = LineEdit.input_string(s)
ret, range, should_complete = bslash_completions(full, endof(partial))[2]
return ret, partial[range], should_complete
end
mutable struct REPLHistoryProvider <: HistoryProvider
history::Array{String,1}
history_file
start_idx::Int
cur_idx::Int
last_idx::Int
last_buffer::IOBuffer
last_mode
mode_mapping
modes::Array{Symbol,1}
end
REPLHistoryProvider(mode_mapping) =
REPLHistoryProvider(String[], nothing, 0, 0, -1, IOBuffer(),
nothing, mode_mapping, UInt8[])
invalid_history_message(path::String) = """
Invalid history file ($path) format:
If you have a history file left over from an older version of Julia,
try renaming or deleting it.
Invalid character: """
munged_history_message(path::String) = """
Invalid history file ($path) format:
An editor may have converted tabs to spaces at line """
function hist_getline(file)
while !eof(file)
line = readline(file, chomp=false)
isempty(line) && return line
line[1] in "\r\n" || return line
end
return ""
end
function hist_from_file(hp, file, path)
hp.history_file = file
seek(file, 0)
countlines = 0
while true
mode = :julia
line = hist_getline(file)
isempty(line) && break
countlines += 1
line[1] != '#' &&
error(invalid_history_message(path), repr(line[1]), " at line ", countlines)
while !isempty(line)
m = match(r"^#\s*(\w+)\s*:\s*(.*?)\s*$", line)
m === nothing && break
if m.captures[1] == "mode"
mode = Symbol(m.captures[2])
end
line = hist_getline(file)
countlines += 1
end
isempty(line) && break
# Make sure starts with tab
line[1] == ' ' &&
error(munged_history_message(path), countlines)
line[1] != '\t' &&
error(invalid_history_message(path), repr(line[1]), " at line ", countlines)
lines = String[]
while !isempty(line)
push!(lines, chomp(line[2:end]))
eof(file) && break
ch = Char(Base.peek(file))
ch == ' ' && error(munged_history_message(path), countlines)
ch != '\t' && break
line = hist_getline(file)
countlines += 1
end
push!(hp.modes, mode)
push!(hp.history, join(lines, '\n'))
end
seekend(file)
hp.start_idx = length(hp.history)
hp
end
function mode_idx(hist::REPLHistoryProvider, mode)
c = :julia
for (k,v) in hist.mode_mapping
isequal(v, mode) && (c = k)
end
return c
end
function add_history(hist::REPLHistoryProvider, s)
str = rstrip(String(s.input_buffer))
isempty(strip(str)) && return
mode = mode_idx(hist, LineEdit.mode(s))
!isempty(hist.history) &&
isequal(mode, hist.modes[end]) && str == hist.history[end] && return
push!(hist.modes, mode)
push!(hist.history, str)
hist.history_file === nothing && return
entry = """
# time: $(Libc.strftime("%Y-%m-%d %H:%M:%S %Z", time()))
# mode: $mode
$(replace(str, r"^"ms, "\t"))
"""
# TODO: write-lock history file
seekend(hist.history_file)
print(hist.history_file, entry)
flush(hist.history_file)
end
function history_move(s::Union{LineEdit.MIState,LineEdit.PrefixSearchState}, hist::REPLHistoryProvider, idx::Int, save_idx::Int = hist.cur_idx)
max_idx = length(hist.history) + 1
@assert 1 <= hist.cur_idx <= max_idx
(1 <= idx <= max_idx) || return :none
idx != hist.cur_idx || return :none
# save the current line
if save_idx == max_idx
hist.last_mode = LineEdit.mode(s)
hist.last_buffer = copy(LineEdit.buffer(s))
else
hist.history[save_idx] = LineEdit.input_string(s)
hist.modes[save_idx] = mode_idx(hist, LineEdit.mode(s))
end
# load the saved line
if idx == max_idx
last_buffer = hist.last_buffer
LineEdit.transition(s, hist.last_mode) do
LineEdit.replace_line(s, last_buffer)
end
hist.last_mode = nothing
hist.last_buffer = IOBuffer()
else
if haskey(hist.mode_mapping, hist.modes[idx])
LineEdit.transition(s, hist.mode_mapping[hist.modes[idx]]) do
LineEdit.replace_line(s, hist.history[idx])
end
else
return :skip
end
end
hist.cur_idx = idx
return :ok
end
# Modified version of accept_result that also transitions modes
function LineEdit.accept_result(s, p::LineEdit.HistoryPrompt{REPLHistoryProvider})
parent = LineEdit.state(s, p).parent
hist = p.hp
if 1 <= hist.cur_idx <= length(hist.modes)
m = hist.mode_mapping[hist.modes[hist.cur_idx]]
LineEdit.transition(s, m) do
LineEdit.replace_line(LineEdit.state(s, m), LineEdit.state(s, p).response_buffer)
end
else
LineEdit.transition(s, parent)
end
end
function history_prev(s::LineEdit.MIState, hist::REPLHistoryProvider,
save_idx::Int = hist.cur_idx)
hist.last_idx = -1
m = history_move(s, hist, hist.cur_idx-1, save_idx)
if m === :ok
LineEdit.move_input_start(s)
LineEdit.reset_key_repeats(s) do
LineEdit.move_line_end(s)
end
LineEdit.refresh_line(s)
elseif m === :skip
hist.cur_idx -= 1
history_prev(s, hist, save_idx)
else
Terminals.beep(LineEdit.terminal(s))
end
end
function history_next(s::LineEdit.MIState, hist::REPLHistoryProvider,
save_idx::Int = hist.cur_idx)
cur_idx = hist.cur_idx
max_idx = length(hist.history) + 1
if cur_idx == max_idx && 0 < hist.last_idx
# issue #6312
cur_idx = hist.last_idx
hist.last_idx = -1
end
m = history_move(s, hist, cur_idx+1, save_idx)
if m === :ok
LineEdit.move_input_end(s)
LineEdit.refresh_line(s)
elseif m === :skip
hist.cur_idx += 1
history_next(s, hist, save_idx)
else
Terminals.beep(LineEdit.terminal(s))
end
end
function history_move_prefix(s::LineEdit.PrefixSearchState,
hist::REPLHistoryProvider,
prefix::AbstractString,
backwards::Bool,
cur_idx = hist.cur_idx)
cur_response = String(LineEdit.buffer(s))
# when searching forward, start at last_idx
if !backwards && hist.last_idx > 0
cur_idx = hist.last_idx
end
hist.last_idx = -1
max_idx = length(hist.history)+1
idxs = backwards ? ((cur_idx-1):-1:1) : ((cur_idx+1):max_idx)
for idx in idxs
if (idx == max_idx) || (startswith(hist.history[idx], prefix) && (hist.history[idx] != cur_response || hist.modes[idx] != LineEdit.mode(s)))
m = history_move(s, hist, idx)
if m === :ok
if idx == max_idx
# on resuming the in-progress edit, leave the cursor where the user last had it
elseif isempty(prefix)
# on empty prefix search, move cursor to the end
LineEdit.move_input_end(s)
else
# otherwise, keep cursor at the prefix position as a visual cue
seek(LineEdit.buffer(s), sizeof(prefix))
end
LineEdit.refresh_line(s)
return :ok
elseif m === :skip
return history_move_prefix(s,hist,prefix,backwards,idx)
end
end
end
Terminals.beep(LineEdit.terminal(s))
end
history_next_prefix(s::LineEdit.PrefixSearchState, hist::REPLHistoryProvider, prefix::AbstractString) =
history_move_prefix(s, hist, prefix, false)
history_prev_prefix(s::LineEdit.PrefixSearchState, hist::REPLHistoryProvider, prefix::AbstractString) =
history_move_prefix(s, hist, prefix, true)
function history_search(hist::REPLHistoryProvider, query_buffer::IOBuffer, response_buffer::IOBuffer,
backwards::Bool=false, skip_current::Bool=false)
qpos = position(query_buffer)
qpos > 0 || return true
searchdata = beforecursor(query_buffer)
response_str = String(response_buffer)
# Alright, first try to see if the current match still works
a = position(response_buffer) + 1
b = min(endof(response_str), prevind(response_str, a + sizeof(searchdata)))
!skip_current && searchdata == response_str[a:b] && return true
searchfunc, searchstart, skipfunc = backwards ? (rsearch, b, prevind) :
(search, a, nextind)
skip_current && (searchstart = skipfunc(response_str, searchstart))
# Start searching
# First the current response buffer
if 1 <= searchstart <= endof(response_str)
match = searchfunc(response_str, searchdata, searchstart)
if match != 0:-1
seek(response_buffer, prevind(response_str, first(match)))
return true
end
end
# Now search all the other buffers
idxs = backwards ? ((hist.cur_idx-1):-1:1) : ((hist.cur_idx+1):length(hist.history))
for idx in idxs
h = hist.history[idx]
match = searchfunc(h, searchdata)
if match != 0:-1 && h != response_str && haskey(hist.mode_mapping, hist.modes[idx])
truncate(response_buffer, 0)
write(response_buffer, h)
seek(response_buffer, prevind(h, first(match)))
hist.cur_idx = idx
return true
end
end
return false
end
function history_reset_state(hist::REPLHistoryProvider)
if hist.cur_idx != length(hist.history) + 1
hist.last_idx = hist.cur_idx
hist.cur_idx = length(hist.history) + 1
end
end
LineEdit.reset_state(hist::REPLHistoryProvider) = history_reset_state(hist)
function return_callback(s)
ast = Base.syntax_deprecation_warnings(false) do
Base.parse_input_line(String(LineEdit.buffer(s)))
end
if !isa(ast, Expr) || (ast.head != :continue && ast.head != :incomplete)
return true
else
return false
end
end
function find_hist_file()
filename = ".julia_history"
if isfile(filename)
return filename
elseif haskey(ENV, "JULIA_HISTORY")
return ENV["JULIA_HISTORY"]
else
return joinpath(homedir(), filename)
end
end
backend(r::AbstractREPL) = r.backendref
send_to_backend(ast, backend::REPLBackendRef) = send_to_backend(ast, backend.repl_channel, backend.response_channel)
function send_to_backend(ast, req, rep)
put!(req, (ast, 1))
val, bt = take!(rep)
end
function respond(f, repl, main; pass_empty = false)
(s,buf,ok)->begin
if !ok
return transition(s, :abort)
end
line = String(take!(buf))
if !isempty(line) || pass_empty
reset(repl)
val, bt = send_to_backend(eval(:(($f)($line))), backend(repl))
if !ends_with_semicolon(line) || bt !== nothing
print_response(repl, val, bt, true, Base.have_color)
end
end
prepare_next(repl)
reset_state(s)
s.current_mode.sticky || transition(s, main)
end
end
function reset(repl::LineEditREPL)
raw!(repl.t, false)
print(repl.t,Base.text_colors[:normal])
end
function prepare_next(repl::LineEditREPL)
println(terminal(repl))
end
function mode_keymap(julia_prompt)
AnyDict(
'\b' => function (s,o...)
if isempty(s) || position(LineEdit.buffer(s)) == 0
buf = copy(LineEdit.buffer(s))
transition(s, julia_prompt) do
LineEdit.state(s, julia_prompt).input_buffer = buf
end
else
LineEdit.edit_backspace(s)
end
end,
"^C" => function (s,o...)
LineEdit.move_input_end(s)
LineEdit.refresh_line(s)
print(LineEdit.terminal(s), "^C\n\n")
transition(s, julia_prompt)
transition(s, :reset)
LineEdit.refresh_line(s)
end)
end
repl_filename(repl, hp::REPLHistoryProvider) = "REPL[$(length(hp.history)-hp.start_idx)]"
repl_filename(repl, hp) = "REPL"
const JL_PROMT_PASTE = Ref(true)
enable_promtpaste(v::Bool) = JL_PROMT_PASTE[] = v
function setup_interface(repl::LineEditREPL; hascolor = repl.hascolor, extra_repl_keymap = Dict{Any,Any}[])
###
#
# This function returns the main interface that describes the REPL
# functionality, it is called internally by functions that setup a
# Terminal-based REPL frontend, but if you want to customize your REPL
# or embed the REPL in another interface, you may call this function
# directly and append it to your interface.
#
# Usage:
#
# repl_channel,response_channel = Channel(),Channel()
# start_repl_backend(repl_channel, response_channel)
# setup_interface(REPLDisplay(t),repl_channel,response_channel)
#
###
###
# We setup the interface in two stages.
# First, we set up all components (prompt,rsearch,shell,help)
# Second, we create keymaps with appropriate transitions between them
# and assign them to the components
#
###
############################### Stage I ################################
# This will provide completions for REPL and help mode
replc = REPLCompletionProvider()
# Set up the main Julia prompt
julia_prompt = Prompt(JULIA_PROMPT;
# Copy colors from the prompt object
prompt_prefix = hascolor ? repl.prompt_color : "",
prompt_suffix = hascolor ?
(repl.envcolors ? Base.input_color : repl.input_color) : "",
keymap_func_data = repl,
complete = replc,
on_enter = return_callback)
# Setup help mode
help_mode = Prompt("help?> ",
prompt_prefix = hascolor ? repl.help_color : "",
prompt_suffix = hascolor ?
(repl.envcolors ? Base.input_color : repl.input_color) : "",
keymap_func_data = repl,
complete = replc,
# When we're done transform the entered line into a call to help("$line")
on_done = respond(Docs.helpmode, repl, julia_prompt))
# Set up shell mode
shell_mode = Prompt("shell> ";
prompt_prefix = hascolor ? repl.shell_color : "",
prompt_suffix = hascolor ?
(repl.envcolors ? Base.input_color : repl.input_color) : "",
keymap_func_data = repl,
complete = ShellCompletionProvider(),
# Transform "foo bar baz" into `foo bar baz` (shell quoting)
# and pass into Base.repl_cmd for processing (handles `ls` and `cd`
# special)
on_done = respond(repl, julia_prompt) do line
Expr(:call, :(Base.repl_cmd), Cmd(Base.shell_split(line)), outstream(repl))
end)
################################# Stage II #############################
# Setup history
# We will have a unified history for all REPL modes
hp = REPLHistoryProvider(Dict{Symbol,Any}(:julia => julia_prompt,
:shell => shell_mode,
:help => help_mode))
if repl.history_file
try
hist_path = find_hist_file()
f = open(hist_path, true, true, true, false, false)
finalizer(replc, replc->close(f))
hist_from_file(hp, f, hist_path)
catch e
print_response(repl, e, catch_backtrace(), true, Base.have_color)
println(outstream(repl))
info("Disabling history file for this session.")
repl.history_file = false
end
end
history_reset_state(hp)
julia_prompt.hist = hp
shell_mode.hist = hp
help_mode.hist = hp
julia_prompt.on_done = respond(x->Base.parse_input_line(x,filename=repl_filename(repl,hp)), repl, julia_prompt)
search_prompt, skeymap = LineEdit.setup_search_keymap(hp)
search_prompt.complete = LatexCompletions()
# Canonicalize user keymap input
if isa(extra_repl_keymap, Dict)
extra_repl_keymap = [extra_repl_keymap]
end
const repl_keymap = AnyDict(
';' => function (s,o...)
if isempty(s) || position(LineEdit.buffer(s)) == 0
buf = copy(LineEdit.buffer(s))
transition(s, shell_mode) do
LineEdit.state(s, shell_mode).input_buffer = buf
end
else
edit_insert(s, ';')
end
end,
'?' => function (s,o...)
if isempty(s) || position(LineEdit.buffer(s)) == 0
buf = copy(LineEdit.buffer(s))
transition(s, help_mode) do
LineEdit.state(s, help_mode).input_buffer = buf
end
else
edit_insert(s, '?')
end
end,
# Bracketed Paste Mode
"\e[200~" => (s,o...)->begin
input = LineEdit.bracketed_paste(s) # read directly from s until reaching the end-bracketed-paste marker
sbuffer = LineEdit.buffer(s)
curspos = position(sbuffer)
seek(sbuffer, 0)
shouldeval = (nb_available(sbuffer) == curspos && search(sbuffer, UInt8('\n')) == 0)
seek(sbuffer, curspos)
if curspos == 0
# if pasting at the beginning, strip leading whitespace
input = lstrip(input)
end
if !shouldeval
# when pasting in the middle of input, just paste in place
# don't try to execute all the WIP, since that's rather confusing
# and is often ill-defined how it should behave
edit_insert(s, input)
return
end
edit_insert(sbuffer, input)
input = String(take!(sbuffer))
oldpos = start(input)
firstline = true
isprompt_paste = false
while !done(input, oldpos) # loop until all lines have been executed
if JL_PROMT_PASTE[]
# Check if the next statement starts with "julia> ", in that case
# skip it. But first skip whitespace
while input[oldpos] in ('\n', ' ', '\t')
oldpos = nextind(input, oldpos)
oldpos >= sizeof(input) && return
end
# Check if input line starts with "julia> ", remove it if we are in prompt paste mode
jl_prompt_len = 7
if (firstline || isprompt_paste) && (oldpos + jl_prompt_len <= sizeof(input) && input[oldpos:oldpos+jl_prompt_len-1] == JULIA_PROMPT)
isprompt_paste = true
oldpos += jl_prompt_len
# If we are prompt pasting and current statement does not begin with julia> , skip to next line
elseif isprompt_paste
while input[oldpos] != '\n'
oldpos = nextind(input, oldpos)
oldpos >= sizeof(input) && return
end
continue
end
end
ast, pos = Base.syntax_deprecation_warnings(false) do
Base.parse(input, oldpos, raise=false)
end
if (isa(ast, Expr) && (ast.head == :error || ast.head == :continue || ast.head == :incomplete)) ||
(done(input, pos) && !endswith(input, '\n'))
# remaining text is incomplete (an error, or parser ran to the end but didn't stop with a newline):
# Insert all the remaining text as one line (might be empty)
tail = input[oldpos:end]
if !firstline
# strip leading whitespace, but only if it was the result of executing something
# (avoids modifying the user's current leading wip line)
tail = lstrip(tail)
end
LineEdit.replace_line(s, tail)
LineEdit.refresh_line(s)
break
end
# get the line and strip leading and trailing whitespace
line = strip(input[oldpos:prevind(input, pos)])
if !isempty(line)
# put the line on the screen and history
LineEdit.replace_line(s, line)
LineEdit.commit_line(s)
# execute the statement
terminal = LineEdit.terminal(s) # This is slightly ugly but ok for now
raw!(terminal, false) && disable_bracketed_paste(terminal)
LineEdit.mode(s).on_done(s, LineEdit.buffer(s), true)
raw!(terminal, true) && enable_bracketed_paste(terminal)
end
oldpos = pos
firstline = false
end
end,
# Open the editor at the location of a stackframe
# This is accessing a global variable that gets set in
# the show_backtrace function.
"^Q" => (s, o...) -> begin
linfos = Base.LAST_BACKTRACE_LINE_INFOS
str = String(take!(LineEdit.buffer(s)))
n = tryparse(Int, str)
isnull(n) && @goto writeback
n = get(n)
if n <= 0 || n > length(linfos) || startswith(linfos[n][1], "./REPL")
@goto writeback
end
Base.edit(linfos[n][1], linfos[n][2])
Base.LineEdit.refresh_line(s)
return
@label writeback
write(Base.LineEdit.buffer(s), str)
return
end,
)
prefix_prompt, prefix_keymap = LineEdit.setup_prefix_keymap(hp, julia_prompt)
a = Dict{Any,Any}[skeymap, repl_keymap, prefix_keymap, LineEdit.history_keymap, LineEdit.default_keymap, LineEdit.escape_defaults]
prepend!(a, extra_repl_keymap)
julia_prompt.keymap_dict = LineEdit.keymap(a)
mk = mode_keymap(julia_prompt)
b = Dict{Any,Any}[skeymap, mk, prefix_keymap, LineEdit.history_keymap, LineEdit.default_keymap, LineEdit.escape_defaults]
prepend!(b, extra_repl_keymap)
shell_mode.keymap_dict = help_mode.keymap_dict = LineEdit.keymap(b)
ModalInterface([julia_prompt, shell_mode, help_mode, search_prompt, prefix_prompt])
end
function run_frontend(repl::LineEditREPL, backend)
d = REPLDisplay(repl)
dopushdisplay = repl.specialdisplay === nothing && !in(d,Base.Multimedia.displays)
dopushdisplay && pushdisplay(d)
if !isdefined(repl,:interface)
interface = repl.interface = setup_interface(repl)
else
interface = repl.interface
end
repl.backendref = backend
run_interface(repl.t, interface)
dopushdisplay && popdisplay(d)
end
if isdefined(Base, :banner_color)
banner(io, t) = banner(io, hascolor(t))
banner(io, x::Bool) = print(io, x ? Base.banner_color : Base.banner_plain)
else
banner(io,t) = Base.banner(io)
end
## StreamREPL ##
mutable struct StreamREPL <: AbstractREPL
stream::IO
prompt_color::String
input_color::String
answer_color::String
waserror::Bool
StreamREPL(stream,pc,ic,ac) = new(stream,pc,ic,ac,false)
end
StreamREPL(stream::IO) = StreamREPL(stream, Base.text_colors[:light_green], Base.input_color(), Base.answer_color())
run_repl(stream::IO) = run_repl(StreamREPL(stream))
outstream(s::StreamREPL) = s.stream
answer_color(r::LineEditREPL) = r.envcolors ? Base.answer_color() : r.answer_color
answer_color(r::StreamREPL) = r.answer_color
input_color(r::LineEditREPL) = r.envcolors ? Base.input_color() : r.input_color
input_color(r::StreamREPL) = r.input_color
function ends_with_semicolon(line)
match = rsearch(line, ';')
if match != 0
for c in line[(match+1):end]
isspace(c) || return c == '#'
end
return true
end
return false
end
function run_frontend(repl::StreamREPL, backend::REPLBackendRef)
have_color = Base.have_color
banner(repl.stream, have_color)
d = REPLDisplay(repl)
dopushdisplay = !in(d,Base.Multimedia.displays)
dopushdisplay && pushdisplay(d)
repl_channel, response_channel = backend.repl_channel, backend.response_channel
while !eof(repl.stream)
if have_color
print(repl.stream,repl.prompt_color)
end
print(repl.stream, "julia> ")
if have_color
print(repl.stream, input_color(repl))
end
line = readline(repl.stream, chomp=false)
if !isempty(line)
ast = Base.parse_input_line(line)
if have_color
print(repl.stream, Base.color_normal)
end
put!(repl_channel, (ast, 1))
val, bt = take!(response_channel)
if !ends_with_semicolon(line)
print_response(repl, val, bt, true, have_color)
end
end
end
# Terminate Backend
put!(repl_channel, (nothing, -1))
dopushdisplay && popdisplay(d)
end
function start_repl_server(port)
listen(port) do server, status
client = accept(server)
run_repl(client)
end
end
end # module