303 lines
7.9 KiB
V
303 lines
7.9 KiB
V
// 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
|
|
|
|
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
|
|
}
|
|
|
|
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() {
|
|
println(util.full_v_version(true))
|
|
println('
|
|
help Displays this information.
|
|
list Show the program so far.
|
|
reset Clears the accumulated program, so you can start a fresh.
|
|
Ctrl-C, Ctrl-D, exit Exits the REPL.
|
|
clear Clears the screen.
|
|
')
|
|
}
|
|
|
|
fn run_repl(workdir string, vrepl_prefix string) {
|
|
println(util.full_v_version(true))
|
|
println('Use Ctrl-C or `exit` to exit')
|
|
|
|
file := os.join_path(workdir, '.${vrepl_prefix}vrepl.v')
|
|
temp_file := os.join_path(workdir, '.${vrepl_prefix}vrepl_temp.v')
|
|
mut prompt := '>>> '
|
|
defer {
|
|
println('')
|
|
os.rm(file)
|
|
os.rm(temp_file)
|
|
$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' {
|
|
term.erase_display('2')
|
|
continue
|
|
}
|
|
if r.line == 'help' {
|
|
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() {
|
|
for rline in r.line.split('\n') {
|
|
if r.in_func || was_func {
|
|
r.functions << rline
|
|
} else {
|
|
r.temp_lines << rline
|
|
}
|
|
}
|
|
if r.indent > 0 {
|
|
continue
|
|
}
|
|
r.line = ''
|
|
}
|
|
if r.line == 'debug_repl' {
|
|
eprintln('repl: $r')
|
|
continue
|
|
}
|
|
if r.line == 'reset' {
|
|
r = Repl{}
|
|
continue
|
|
}
|
|
if r.line == 'list' {
|
|
source_code := r.current_source_code(true)
|
|
println('//////////////////////////////////////////////////////////////////////////////////////')
|
|
println(source_code)
|
|
println('//////////////////////////////////////////////////////////////////////////////////////')
|
|
continue
|
|
}
|
|
// Save the source only if the user is printing something,
|
|
// but don't add this print call to the `lines` array,
|
|
// so that it doesn't get called during the next print.
|
|
if r.line.starts_with('='){
|
|
r.line = 'println(' + r.line[1..] + ')'
|
|
}
|
|
if r.line.starts_with('print') {
|
|
source_code := r.current_source_code(false) + '\n${r.line}\n'
|
|
os.write_file(file, source_code)
|
|
s := os.exec('"$vexe" -repl run "$file"') or {
|
|
rerror(err)
|
|
return
|
|
}
|
|
print_output(s)
|
|
} else {
|
|
mut temp_line := r.line
|
|
mut temp_flag := false
|
|
func_call := r.function_call(r.line)
|
|
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 ', ':=', 'for '
|
|
]
|
|
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 {
|
|
for i, l in r.lines {
|
|
if (l.starts_with('for ') || l.starts_with('if ')) && l.contains('println') {
|
|
r.lines.delete(i)
|
|
break
|
|
}
|
|
}
|
|
|
|
temp_source_code = r.current_source_code(true) + '\n${temp_line}\n'
|
|
}
|
|
os.write_file(temp_file, temp_source_code)
|
|
s := os.exec('"$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
|
|
}
|
|
} else {
|
|
for r.temp_lines.len > 0 {
|
|
r.temp_lines.delete(0)
|
|
}
|
|
}
|
|
print_output(s)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_output(s os.Result) {
|
|
lines := s.output.split('\n')
|
|
for line in lines {
|
|
if line.contains('.vrepl_temp.v:') {
|
|
// Hide the temporary file name
|
|
sline := line.all_after('.vrepl_temp.v:')
|
|
idx := sline.index(' ') or {
|
|
println(sline)
|
|
return
|
|
}
|
|
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 {
|
|
println(line)
|
|
}
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
// 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.
|
|
args := cmdline.options_after(os.args, ['repl'])
|
|
replfolder := os.real_path(cmdline.option(args, '-replfolder', '.'))
|
|
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')
|
|
os.flush()
|
|
}
|