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