v/cmd/tools/vtest-parser.v

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import os
import flag
import term
import time
import v.parser
import v.ast
import v.pref
const (
vexe = pref.vexe_path()
vroot = os.dir(vexe)
support_color = term.can_show_color_on_stderr() && term.can_show_color_on_stdout()
ecode_timeout = 101
ecode_memout = 102
ecode_details = {
-1: 'worker executable not found'
101: 'too slow'
102: 'too memory hungry'
}
)
struct Context {
mut:
is_help bool
is_worker bool
is_verbose bool
is_silent bool // do not print any status/progress during processing, just failures.
is_linear bool // print linear progress log, without trying to do term cursor up + \r msg. Easier to use in a CI job
timeout_ms int
myself string // path to this executable, so the supervisor can launch worker processes
all_paths []string // all files given to the supervisor process
path string // the current path, given to a worker process
cut_index int // the cut position in the source from context.path
max_index int // the maximum index (equivalent to the file content length)
// parser context in the worker processes:
table ast.Table
scope ast.Scope
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pref &pref.Preferences
period_ms int // print periodic progress
stop_print bool // stop printing the periodic progress
}
fn main() {
mut context := process_cli_args()
if context.is_worker {
pid := os.getpid()
context.log('> worker ${pid:5} starts parsing at cut_index: ${context.cut_index:5} | $context.path')
// A worker's process job is to try to parse a single given file in context.path.
// It can crash/panic freely.
context.table = ast.new_table()
context.scope = &ast.Scope{
parent: 0
}
context.pref = &pref.Preferences{
output_mode: .silent
}
mut source := os.read_file(context.path) ?
source = source[..context.cut_index]
go fn (ms int) {
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time.sleep(ms * time.millisecond)
exit(ecode_timeout)
}(context.timeout_ms)
_ := parser.parse_text(source, context.path, context.table, .skip_comments, context.pref)
context.log('> worker ${pid:5} finished parsing $context.path')
exit(0)
} else {
// The process supervisor should NOT crash/panic, unlike the workers.
// It's job, is to:
// 1) start workers
// 2) accumulate results
// 3) produce a summary at the end
context.expand_all_paths()
mut fails := 0
mut panics := 0
sw := time.new_stopwatch()
for path in context.all_paths {
filesw := time.new_stopwatch()
context.start_printing()
new_fails, new_panics := context.process_whole_file_in_worker(path)
fails += new_fails
panics += new_panics
context.stop_printing()
context.info('File: ${path:-30} | new_fails: ${new_fails:5} | new_panics: ${new_panics:5} | Elapsed time: ${filesw.elapsed().milliseconds()}ms')
}
non_panics := fails - panics
context.info('Total files processed: ${context.all_paths.len:5} | Errors found: ${fails:5} | Panics: ${panics:5} | Non panics: ${non_panics:5} | Elapsed time: ${sw.elapsed().milliseconds()}ms')
if fails > 0 {
exit(1)
}
exit(0)
}
}
fn process_cli_args() &Context {
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mut context := &Context{
pref: pref.new_preferences()
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}
context.myself = os.executable()
mut fp := flag.new_flag_parser(os.args_after('test-parser'))
fp.application(os.file_name(context.myself))
fp.version('0.0.1')
fp.description('Test the V parser, by parsing each .v file in each PATH,\n' +
'as if it was typed character by character by the user.\n' +
'A PATH can be either a folder, or a specific .v file.\n' +
'NB: you *have to quote* the PATH, if it contains spaces/punctuation.')
fp.arguments_description('PATH1 PATH2 ...')
fp.skip_executable()
context.is_help = fp.bool('help', `h`, false, 'Show help/usage screen.')
context.is_verbose = fp.bool('verbose', `v`, false, 'Be more verbose.')
context.is_silent = fp.bool('silent', `S`, false, 'Do not print progress at all.')
context.is_linear = fp.bool('linear', `L`, false, 'Print linear progress log. Suitable for CI.')
context.period_ms = fp.int('progress_ms', `s`, 500, 'print a status report periodically, the period is given in milliseconds.')
context.is_worker = fp.bool('worker', `w`, false, 'worker specific flag - is this a worker process, that can crash/panic.')
context.cut_index = fp.int('cut_index', `c`, 1, 'worker specific flag - cut index in the source file, everything before that will be parsed, the rest - ignored.')
context.timeout_ms = fp.int('timeout_ms', `t`, 250, 'worker specific flag - timeout in ms; a worker taking longer, will self terminate.')
context.path = fp.string('path', `p`, '', 'worker specific flag - path to the current source file, which will be parsed.')
//
if context.is_help {
println(fp.usage())
exit(0)
}
context.all_paths = fp.finalize() or {
context.error(err.msg)
exit(1)
}
if !context.is_worker && context.all_paths.len == 0 {
println(fp.usage())
exit(0)
}
return context
}
// ////////////////
fn bold(msg string) string {
if !support_color {
return msg
}
return term.bold(msg)
}
fn red(msg string) string {
if !support_color {
return msg
}
return term.red(msg)
}
fn yellow(msg string) string {
if !support_color {
return msg
}
return term.yellow(msg)
}
fn (mut context Context) info(msg string) {
println(msg)
}
fn (mut context Context) log(msg string) {
if context.is_verbose {
label := yellow('info')
ts := time.now().format_ss_micro()
eprintln('$label: $ts | $msg')
}
}
fn (mut context Context) error(msg string) {
label := red('error')
eprintln('$label: $msg')
}
fn (mut context Context) expand_all_paths() {
context.log('> context.all_paths before: $context.all_paths')
mut files := []string{}
for path in context.all_paths {
if os.is_dir(path) {
files << os.walk_ext(path, '.v')
files << os.walk_ext(path, '.vsh')
continue
}
if !path.ends_with('.v') && !path.ends_with('.vv') && !path.ends_with('.vsh') {
context.error('`v test-parser` can only be used on .v/.vv/.vsh files.\nOffending file: "$path".')
continue
}
if !os.exists(path) {
context.error('"$path" does not exist.')
continue
}
files << path
}
context.all_paths = files
context.log('> context.all_paths after: $context.all_paths')
}
fn (mut context Context) process_whole_file_in_worker(path string) (int, int) {
context.path = path // needed for the progress bar
context.log('> context.process_whole_file_in_worker path: $path')
if !(os.is_file(path) && os.is_readable(path)) {
context.error('$path is not readable')
return 1, 0
}
source := os.read_file(path) or { '' }
if source == '' {
// an empty file is a valid .v file
return 0, 0
}
len := source.len - 1
mut fails := 0
mut panics := 0
context.max_index = len
for i in 0 .. len {
verbosity := if context.is_verbose { '-v' } else { '' }
context.cut_index = i // needed for the progress bar
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cmd := '${os.quoted_path(context.myself)} $verbosity --worker --timeout_ms ${context.timeout_ms:5} --cut_index ${i:5} --path ${os.quoted_path(path)} '
context.log(cmd)
mut res := os.execute(cmd)
context.log('worker exit_code: $res.exit_code | worker output:\n$res.output')
if res.exit_code != 0 {
fails++
mut is_panic := false
if res.output.contains('V panic:') {
is_panic = true
panics++
}
part := source[..i]
line := part.count('\n') + 1
last_line := part.all_after_last('\n')
col := last_line.len
err := if is_panic {
red('parser failure: panic')
} else {
red('parser failure: crash, ${ecode_details[res.exit_code]}')
}
path_to_line := bold('$path:$line:$col:')
err_line := last_line.trim_left('\t')
println('$path_to_line $err')
println('\t$line | $err_line')
println('')
eprintln(res.output)
}
}
return fails, panics
}
fn (mut context Context) start_printing() {
context.stop_print = false
if !context.is_linear && !context.is_silent {
println('\n')
}
go context.print_periodic_status()
}
fn (mut context Context) stop_printing() {
context.stop_print = true
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time.sleep(time.millisecond * context.period_ms / 5)
}
fn (mut context Context) print_status() {
if context.is_silent {
return
}
if (context.cut_index == 1) && (context.max_index == 0) {
return
}
msg := '> ${context.path:-30} | index: ${context.cut_index:5}/${context.max_index - 1:5}'
if context.is_linear {
eprintln(msg)
return
}
term.cursor_up(1)
eprint('\r $msg\n')
}
fn (mut context Context) print_periodic_status() {
context.print_status()
mut printed_at_least_once := false
for !context.stop_print {
context.print_status()
for i := 0; i < 10 && !context.stop_print; i++ {
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time.sleep(time.millisecond * context.period_ms / 10)
if context.cut_index > 50 && !printed_at_least_once {
context.print_status()
printed_at_least_once = true
}
}
}
context.print_status()
}