v/compiler/repl.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
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import term
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.left(i + 1) + '\n' + r.line.right(i + 1)
is_cut = true
i++
r.indent++
}
if r.line[i] == `}` && !in_string {
r.line = r.line.left(i) + '\n' + r.line.right(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
}
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fn repl_help() {
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version_hash := vhash()
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println('
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V $Version $version_hash
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help Displays this information.
Ctrl-C, Ctrl-D, exit Exits the REPL.
clear Clears the screen.
')
}
fn run_repl() []string {
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version_hash := vhash()
println('V $Version $version_hash')
println('Use Ctrl-C or `exit` to exit')
file := '.vrepl.v'
temp_file := '.vrepl_temp.v'
defer {
os.rm(file)
os.rm(temp_file)
os.rm(file.left(file.len - 2))
os.rm(temp_file.left(temp_file.len - 2))
}
mut r := Repl{}
vexe := os.args[0]
for {
if r.indent == 0 {
print('>>> ')
}
else {
print('... ')
}
r.line = os.get_raw_line()
if r.line.trim_space() == '' && r.line.ends_with('\n') {
continue
}
r.line = r.line.trim_space()
if r.line.len == -1 || r.line == '' || r.line == 'exit' {
break
}
if r.line == '\n' {
continue
}
if r.line == 'clear' {
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term.erase_display('2')
continue
}
if r.line == 'help' {
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repl_help()
continue
}
if r.line.starts_with('fn') {
r.in_func = true
r.functions_name << r.line.all_after('fn').all_before('(').trim_space()
}
was_func := r.in_func
if r.checks() {
for line in r.line.split('\n') {
if r.in_func || was_func {
r.functions << line
}
else {
r.temp_lines << line
}
}
if r.indent > 0 {
continue
}
r.line = ''
}
// Save the source only if the user is printing something,
// but don't add this print call to the `lines` array,
// so that it doesn't get called during the next print.
if r.line.starts_with('print') {
source_code := r.functions.join('\n') + r.lines.join('\n') + '\n' + r.line
os.write_file(file, source_code)
s := os.exec('$vexe run $file -repl') or {
verror(err)
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return []string
}
vals := s.output.split('\n')
for i:=0; i < vals.len; i++ {
println(vals[i])
}
}
else {
mut temp_line := r.line
mut temp_flag := false
func_call := r.function_call(r.line)
if !(r.line.contains(' ') || r.line.contains(':') || r.line.contains('=') || r.line.contains(',') || r.line == '') && !func_call {
temp_line = 'println($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 {
verror(err)
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return []string
}
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)
}
}
vals := s.output.split('\n')
for i:=0; i<vals.len; i++ {
println(vals[i])
}
}
}
return r.lines
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}