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