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refactor(parser): encode all parsing state of FlagSubCommand in Parser

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rami3l 2021-05-29 21:26:21 +02:00
parent 65b3892ef6
commit a91ca7fc1b
1 changed files with 15 additions and 19 deletions
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34
src/parse/parser.rs
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@ -24,8 +24,7 @@ use crate::{
pub(crate) enum ParseResult {
Flag,
FlagSubCommand(String),
// subcommand name, whether there are more shorts args remaining
FlagSubCommandShort(String, bool),
FlagSubCommandShort(String),
Opt(Id),
Pos(Id),
MaybeHyphenValue,
@ -388,7 +387,7 @@ impl<'help, 'app> Parser<'help, 'app> {
subcmd_name = Some(name.to_owned());
break;
}
ParseResult::FlagSubCommandShort(_, _) => unreachable!(),
ParseResult::FlagSubCommandShort(_) => unreachable!(),
_ => (),
}
} else if arg_os.starts_with("-")
@ -411,21 +410,18 @@ impl<'help, 'app> Parser<'help, 'app> {
ParseResult::Opt(..) | ParseResult::Flag | ParseResult::ValuesDone => {
continue;
}
ParseResult::FlagSubCommandShort(ref name, done) => {
// There are more short args, revisit the current short args skipping the subcommand
keep_state = !done;
if keep_state {
it.cursor -= 1;
// Here `self.flag_subcmd_at` can be safely unwrapped, because the only place to get a true `keep_state`
// (ie. a false `done`) is in `Parser::parse_short_arg`, during which `self.flag_subcmd_at` should have
// been set anyway.
// If not, it's definitely an internal error!
// Since we are now saving the current state, the number of flags to skip during state recovery should
// be the current index (`cur_idx`) minus ONE UNIT TO THE LEFT of the starting position.
self.flag_subcmd_skip = self.cur_idx.get()
- self.flag_subcmd_at.expect(INTERNAL_ERROR_MSG)
+ 1;
}
ParseResult::FlagSubCommandShort(ref name) => {
// If there are more short flags to be processed, we should keep the state, and later
// revisit the current group of short flags skipping the subcommand.
keep_state = self
.flag_subcmd_at
.map(|at| {
it.cursor -= 1;
// Since we are now saving the current state, the number of flags to skip during state recovery should
// be the current index (`cur_idx`) minus ONE UNIT TO THE LEFT of the starting position.
self.flag_subcmd_skip = self.cur_idx.get() - at + 1;
})
.is_some();
debug!(
"Parser::get_matches_with:FlagSubCommandShort: subcmd_name={}, keep_state={}, flag_subcmd_skip={}",
@ -1166,7 +1162,7 @@ impl<'help, 'app> Parser<'help, 'app> {
if done_short_args {
self.flag_subcmd_at = None;
}
return Ok(ParseResult::FlagSubCommandShort(name, done_short_args));
return Ok(ParseResult::FlagSubCommandShort(name));
} else {
let arg = format!("-{}", c);