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v/cmd/tools/vrepl.v

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// Copyright (c) 2019-2020 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
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import os
import term
import readline
import os.cmdline
import v.util
struct Repl {
mut:
indent int // indentation level
in_func bool // are we inside a new custom user function
line string // the current line entered by the user
//
imports []string // all the import statements
functions []string // all the user function declarations
functions_name []string // all the user function names
lines []string // all the other lines/statements
temp_lines []string // all the temporary expressions/printlns
}
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fn (mut r Repl) checks() bool {
mut in_string := 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..]
i++
r.indent++
}
if r.line[i] == `}` && !in_string {
r.line = r.line[..i] + '\n' + r.line[i..]
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
}
fn (r &Repl) function_call(line string) bool {
for function in r.functions_name {
if line.starts_with(function) {
return true
}
}
return false
}
fn (r &Repl) current_source_code(should_add_temp_lines bool) string {
mut all_lines := []string{}
all_lines << r.imports
all_lines << r.functions
all_lines << r.lines
if should_add_temp_lines {
all_lines << r.temp_lines
}
return all_lines.join('\n')
}
fn repl_help() {
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println(util.full_v_version(true))
println('
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help Displays this information.
list Show the program so far.
reset Clears the accumulated program, so you can start a fresh.
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Ctrl-C, Ctrl-D, exit Exits the REPL.
clear Clears the screen.
')
}
fn run_repl(workdir string, vrepl_prefix string) {
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println(util.full_v_version(true))
println('Use Ctrl-C or `exit` to exit')
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file := os.join_path(workdir, '.${vrepl_prefix}vrepl.v')
temp_file := os.join_path(workdir, '.${vrepl_prefix}vrepl_temp.v')
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mut prompt := '>>> '
defer {
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println('')
os.rm(file)
os.rm(temp_file)
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$if windows {
os.rm(file[..file.len - 2] + '.exe')
os.rm(temp_file[..temp_file.len - 2] + '.exe')
$if msvc {
os.rm(file[..file.len - 2] + '.ilk')
os.rm(file[..file.len - 2] + '.pdb')
os.rm(temp_file[..temp_file.len - 2] + '.ilk')
os.rm(temp_file[..temp_file.len - 2] + '.pdb')
}
} $else {
os.rm(file[..file.len - 2])
os.rm(temp_file[..temp_file.len - 2])
}
}
mut r := Repl{}
mut readline := readline.Readline{}
vexe := os.getenv('VEXE')
for {
if r.indent == 0 {
prompt = '>>> '
} else {
prompt = '... '
}
oline := readline.read_line(prompt) or {
break
}
line := oline.trim_space()
if line == '' && oline.ends_with('\n') {
continue
}
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.contains(':=') && r.line.contains('fn(') {
r.in_func = true
r.functions_name << r.line.all_before(':= fn(').trim_space()
}
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() {
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for rline in r.line.split('\n') {
if r.in_func || was_func {
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r.functions << rline
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} else {
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r.temp_lines << rline
}
}
if r.indent > 0 {
continue
}
r.line = ''
}
if r.line == 'debug_repl' {
eprintln('repl: $r')
continue
}
if r.line == 'reset' {
r = Repl{}
continue
}
if r.line == 'list' {
source_code := r.current_source_code(true)
println('//////////////////////////////////////////////////////////////////////////////////////')
println(source_code)
println('//////////////////////////////////////////////////////////////////////////////////////')
continue
}
// Save the source only if the user is printing something,
// but don't add this print call to the `lines` array,
// so that it doesn't get called during the next print.
if r.line.starts_with('print') {
source_code := r.current_source_code(false) + '\n${r.line}\n'
os.write_file(file, source_code)
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s := os.exec('"$vexe" -repl run $file') or {
rerror(err)
return
}
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print_output(s)
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} else {
mut temp_line := r.line
mut temp_flag := false
func_call := r.function_call(r.line)
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filter_line := r.line.replace(r.line.find_between('\'', '\''), '').replace(r.line.find_between('"', '"'), '')
possible_statement_patterns := [
'=', '++', '--', '<<',
'//', '/*',
'fn ', 'pub ', 'mut ', 'enum ', 'const ', 'struct ', 'interface ', 'import ',
'#include ', ':='
]
mut is_statement := false
for pattern in possible_statement_patterns {
if filter_line.contains(pattern) {
is_statement = true
break
}
}
// NB: starting a line with 2 spaces escapes the println heuristic
if oline.starts_with(' ') {
is_statement = true
}
if !is_statement && !func_call && r.line != '' {
temp_line = 'println($r.line)'
temp_flag = true
}
mut temp_source_code := ''
if temp_line.starts_with('import ') || temp_line.starts_with('#include ') {
temp_source_code = '${temp_line}\n' + r.current_source_code(false)
} else {
temp_source_code = r.current_source_code(true) + '\n${temp_line}\n'
}
os.write_file(temp_file, temp_source_code)
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s := os.exec('"$vexe" -repl run $temp_file') or {
rerror(err)
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)
}
if r.line.starts_with('import ') || r.line.starts_with('#include ') {
mut imports := r.imports
r.imports = [r.line]
r.imports << imports
} else {
r.lines << r.line
}
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} else {
for r.temp_lines.len > 0 {
r.temp_lines.delete(0)
}
}
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print_output(s)
}
}
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}
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fn print_output(s os.Result) {
lines := s.output.split('\n')
for line in lines {
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if line.contains('.vrepl_temp.v:') {
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// Hide the temporary file name
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sline := line.all_after('.vrepl_temp.v:')
idx := sline.index(' ') or {
println(sline)
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return
}
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println(sline[idx+1..])
} else if line.contains('.vrepl.v:') {
// Ensure that .vrepl.v: is at the start, ignore the path
// This is needed to have stable .repl tests.
idx := line.index('.vrepl.v:') or { return }
println(line[idx..])
} else {
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println(line)
}
}
}
fn main() {
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// Support for the parameters replfolder and replprefix is needed
// so that the repl can be launched in parallel by several different
// threads by the REPL test runner.
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args := cmdline.options_after(os.args, ['repl'])
replfolder := os.real_path(cmdline.option(args, '-replfolder', '.'))
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replprefix := cmdline.option(args, '-replprefix', 'noprefix.')
os.chdir(replfolder)
if !os.exists(os.getenv('VEXE')) {
println('Usage:')
println(' VEXE=vexepath vrepl\n')
println(' ... where vexepath is the full path to the v executable file')
return
}
run_repl(replfolder, replprefix)
}
fn rerror(s string) {
println('V repl error: $s')
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os.flush()
}