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v/tools/vrepl.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module main
import (
os
term
readline
)
struct Repl {
mut:
indent int
in_func bool
line string
lines []string
temp_lines []string
functions_name []string
functions []string
}
fn (r mut Repl) checks() bool {
mut in_string := false
mut is_cut := false
was_indent := r.indent > 0
for i := 0; i < r.line.len; i++ {
if r.line[i] == `\'` && (i == 0 || r.line[i - 1] != `\\`) {
in_string = !in_string
}
if r.line[i] == `{` && !in_string {
r.line = r.line[..i + 1] + '\n' + r.line[i + 1..]
is_cut = true
i++
r.indent++
}
if r.line[i] == `}` && !in_string {
r.line = r.line[..i] + '\n' + r.line[i..]
is_cut = true
i++
r.indent--
if r.indent == 0 {
r.in_func = false
}
}
if i + 2 < r.line.len && r.indent == 0 && r.line[i + 1] == `f` && r.line[i + 2] == `n` {
r.in_func = true
}
}
return r.in_func || (was_indent && r.indent <= 0) || r.indent > 0 || is_cut
}
fn (r &Repl) function_call(line string) bool {
for function in r.functions_name {
if line.starts_with(function) {
return true
}
}
return false
}
pub fn repl_help() {
version := v_version()
println(version)
println('
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help Displays this information.
Ctrl-C, Ctrl-D, exit Exits the REPL.
clear Clears the screen.
')
}
pub fn run_repl() []string {
version := v_version()
println(version)
println('Use Ctrl-C or `exit` to exit')
file := '.vrepl.v'
temp_file := '.vrepl_temp.v'
mut prompt := '>>> '
defer {
os.rm(file)
os.rm(temp_file)
os.rm(file[..file.len - 2])
os.rm(temp_file[..temp_file.len - 2])
}
mut r := Repl{}
mut readline := readline.Readline{}
vexe := os.args[1]
for {
if r.indent == 0 {
prompt = '>>> '
}
else {
prompt = '... '
}
mut line := readline.read_line(prompt) or {
break
}
if line.trim_space() == '' && line.ends_with('\n') {
continue
}
line = line.trim_space()
if line.len <= -1 || line == '' || line == 'exit' {
break
}
r.line = line
if r.line == '\n' {
continue
}
if r.line == 'clear' {
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term.erase_display('2')
continue
}
if r.line == 'help' {
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repl_help()
continue
}
if r.line.starts_with('fn') {
r.in_func = true
r.functions_name << r.line.all_after('fn').all_before('(').trim_space()
}
was_func := r.in_func
if r.checks() {
for line in r.line.split('\n') {
if r.in_func || was_func {
r.functions << line
}
else {
r.temp_lines << line
}
}
if r.indent > 0 {
continue
}
r.line = ''
}
// Save the source only if the user is printing something,
// but don't add this print call to the `lines` array,
// so that it doesn't get called during the next print.
if r.line.starts_with('print') {
source_code := r.functions.join('\n') + r.lines.join('\n') + '\n' + r.line
os.write_file(file, source_code)
s := os.exec('"$vexe" run $file -repl') or {
rerror(err)
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return []
}
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print_output(s)
}
else {
mut temp_line := r.line
mut temp_flag := false
func_call := r.function_call(r.line)
if !(r.line.contains(' ') || r.line.contains(':') || r.line.contains('=') || r.line.contains(',') || r.line == '') && !func_call {
temp_line = 'println($r.line)'
temp_flag = true
}
temp_source_code := r.functions.join('\n') + r.lines.join('\n') + '\n' + r.temp_lines.join('\n') + '\n' + temp_line
os.write_file(temp_file, temp_source_code)
s := os.exec('"$vexe" run $temp_file -repl') or {
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println("SDFSDF")
rerror(err)
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return []
}
if !func_call && s.exit_code == 0 && !temp_flag {
for r.temp_lines.len > 0 {
if !r.temp_lines[0].starts_with('print') {
r.lines << r.temp_lines[0]
}
r.temp_lines.delete(0)
}
r.lines << r.line
}
else {
for r.temp_lines.len > 0 {
r.temp_lines.delete(0)
}
}
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print_output(s)
}
}
return r.lines
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}
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fn print_output(s os.Result) {
lines := s.output.split('\n')
for line in lines {
if line.starts_with('.vrepl_temp.v') {
// Hide the temporary file name
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idx := line.index(' ') or {
println(line)
return
}
println(line[idx+1..])
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} else {
println(line)
}
}
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}
fn main() {
if os.args.len < 2 || !os.exists(os.args[1]) {
println('Usage:')
println(' vrepl vexepath\n')
println(' ... where vexepath is the full path to the v executable file')
return
}
run_repl()
}
pub fn rerror(s string) {
println('V repl error: $s')
os.flush_stdout()
exit(1)
}
fn v_version() string {
vexe := os.args[1]
vversion_res := os.exec('$vexe --version') or { panic('"$vexe --version" is not working') }
return vversion_res.output
}