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parser.rs
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/
parser.rs
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// Std
use std::ffi::{OsStr, OsString};
use std::fmt::Display;
use std::fs::File;
use std::io::{self, BufWriter, Write};
#[cfg(feature = "debug")]
use std::os::unix::ffi::OsStrExt;
use std::path::PathBuf;
use std::slice::Iter;
use std::iter::Peekable;
// Internal
use INTERNAL_ERROR_MSG;
use INVALID_UTF8;
use SubCommand;
use app::App;
use app::help::Help;
use app::meta::AppMeta;
use app::settings::AppFlags;
use args::{AnyArg, ArgMatcher, Base, Switched, Arg, ArgGroup, FlagBuilder, OptBuilder, PosBuilder};
use args::settings::ArgSettings;
use completions::ComplGen;
use errors::{Error, ErrorKind};
use errors::Result as ClapResult;
use fmt::ColorWhen;
use osstringext::OsStrExt2;
use completions::Shell;
use suggestions;
use app::settings::AppSettings as AS;
use app::validator::Validator;
use app::usage;
use map::{self, VecMap};
#[derive(Debug, PartialEq, Copy, Clone)]
#[doc(hidden)]
pub enum ParseResult<'a> {
Flag,
Opt(&'a str),
Pos(&'a str),
MaybeHyphenValue,
MaybeNegNum,
NotFound,
ValuesDone,
}
#[allow(missing_debug_implementations)]
#[doc(hidden)]
#[derive(Clone, Default)]
pub struct Parser<'a, 'b>
where 'a: 'b
{
pub meta: AppMeta<'b>,
settings: AppFlags,
pub g_settings: AppFlags,
pub flags: Vec<FlagBuilder<'a, 'b>>,
pub opts: Vec<OptBuilder<'a, 'b>>,
pub positionals: VecMap<PosBuilder<'a, 'b>>,
pub subcommands: Vec<App<'a, 'b>>,
pub groups: Vec<ArgGroup<'a>>,
pub global_args: Vec<Arg<'a, 'b>>,
pub required: Vec<&'a str>,
pub r_ifs: Vec<(&'a str, &'b str, &'a str)>,
pub blacklist: Vec<&'b str>,
pub overrides: Vec<&'b str>,
help_short: Option<char>,
version_short: Option<char>,
cache: Option<&'a str>,
pub help_message: Option<&'a str>,
pub version_message: Option<&'a str>,
}
impl<'a, 'b> Parser<'a, 'b>
where 'a: 'b
{
pub fn with_name(n: String) -> Self {
Parser {
meta: AppMeta::with_name(n),
..Default::default()
}
}
pub fn help_short(&mut self, s: &str) {
let c = s.trim_left_matches(|c| c == '-')
.chars()
.nth(0)
.unwrap_or('h');
self.help_short = Some(c);
}
pub fn version_short(&mut self, s: &str) {
let c = s.trim_left_matches(|c| c == '-')
.chars()
.nth(0)
.unwrap_or('V');
self.version_short = Some(c);
}
pub fn gen_completions_to<W: Write>(&mut self, for_shell: Shell, buf: &mut W) {
if !self.is_set(AS::Propogated) {
self.propogate_help_version();
self.build_bin_names();
self.propogate_globals();
self.propogate_settings();
self.set(AS::Propogated);
}
ComplGen::new(self).generate(for_shell, buf)
}
pub fn gen_completions(&mut self, for_shell: Shell, od: OsString) {
use std::error::Error;
let out_dir = PathBuf::from(od);
let name = &*self.meta.bin_name.as_ref().unwrap().clone();
let file_name = match for_shell {
Shell::Bash => format!("{}.bash-completion", name),
Shell::Fish => format!("{}.fish", name),
Shell::Zsh => format!("_{}", name),
Shell::PowerShell => format!("_{}.ps1", name),
};
let mut file = match File::create(out_dir.join(file_name)) {
Err(why) => panic!("couldn't create completion file: {}", why.description()),
Ok(file) => file,
};
self.gen_completions_to(for_shell, &mut file)
}
#[inline]
fn app_debug_asserts(&mut self) -> bool {
assert!(self.verify_positionals());
let should_err = self.groups
.iter()
.all(|g| {
g.args
.iter()
.all(|arg| {
(self.flags.iter().any(|f| &f.b.name == arg) ||
self.opts.iter().any(|o| &o.b.name == arg) ||
self.positionals.values().any(|p| &p.b.name == arg) ||
self.groups.iter().any(|g| &g.name == arg))
})
});
let g = self.groups
.iter()
.find(|g| {
g.args
.iter()
.any(|arg| {
!(self.flags.iter().any(|f| &f.b.name == arg) ||
self.opts.iter().any(|o| &o.b.name == arg) ||
self.positionals.values().any(|p| &p.b.name == arg) ||
self.groups.iter().any(|g| &g.name == arg))
})
});
assert!(should_err,
"The group '{}' contains the arg '{}' that doesn't actually exist.",
g.unwrap().name,
g.unwrap()
.args
.iter()
.find(|arg| {
!(self.flags.iter().any(|f| &&f.b.name == arg) ||
self.opts.iter().any(|o| &&o.b.name == arg) ||
self.positionals.values().any(|p| &&p.b.name == arg) ||
self.groups.iter().any(|g| &&g.name == arg))
})
.unwrap());
true
}
#[inline]
fn debug_asserts(&self, a: &Arg) -> bool {
assert!(!arg_names!(self).any(|name| name == a.b.name),
format!("Non-unique argument name: {} is already in use", a.b.name));
if let Some(l) = a.s.long {
assert!(!self.contains_long(l),
"Argument long must be unique\n\n\t--{} is already in use",
l);
}
if let Some(s) = a.s.short {
assert!(!self.contains_short(s),
"Argument short must be unique\n\n\t-{} is already in use",
s);
}
let i = if a.index.is_none() {
(self.positionals.len() + 1)
} else {
a.index.unwrap() as usize
};
assert!(!self.positionals.contains_key(i),
"Argument \"{}\" has the same index as another positional \
argument\n\n\tPerhaps try .multiple(true) to allow one positional argument \
to take multiple values",
a.b.name);
assert!(!(a.is_set(ArgSettings::Required) && a.is_set(ArgSettings::Global)),
"Global arguments cannot be required.\n\n\t'{}' is marked as \
global and required",
a.b.name);
if a.b.is_set(ArgSettings::Last) {
assert!(!self.positionals
.values()
.any(|p| p.b.is_set(ArgSettings::Last)),
"Only one positional argument may have last(true) set. Found two.");
assert!(a.s.long.is_none(),
"Flags or Options may not have last(true) set. {} has both a long and last(true) set.",
a.b.name);
assert!(a.s.short.is_none(),
"Flags or Options may not have last(true) set. {} has both a short and last(true) set.",
a.b.name);
}
true
}
#[inline]
fn add_conditional_reqs(&mut self, a: &Arg<'a, 'b>) {
if let Some(ref r_ifs) = a.r_ifs {
for &(arg, val) in r_ifs {
self.r_ifs.push((arg, val, a.b.name));
}
}
}
#[inline]
fn add_arg_groups(&mut self, a: &Arg<'a, 'b>) {
if let Some(ref grps) = a.b.groups {
for g in grps {
let mut found = false;
if let Some(ref mut ag) = self.groups.iter_mut().find(|grp| &grp.name == g) {
ag.args.push(a.b.name);
found = true;
}
if !found {
let mut ag = ArgGroup::with_name(g);
ag.args.push(a.b.name);
self.groups.push(ag);
}
}
}
}
#[inline]
fn add_reqs(&mut self, a: &Arg<'a, 'b>) {
if a.is_set(ArgSettings::Required) {
// If the arg is required, add all it's requirements to master required list
if let Some(ref areqs) = a.b.requires {
for name in areqs
.iter()
.filter(|&&(val, _)| val.is_none())
.map(|&(_, name)| name) {
self.required.push(name);
}
}
self.required.push(a.b.name);
}
}
#[inline]
fn implied_settings(&mut self, a: &Arg<'a, 'b>) {
if a.is_set(ArgSettings::Last) {
// if an arg has `Last` set, we need to imply DontCollapseArgsInUsage so that args
// in the usage string don't get confused or left out.
self.set(AS::DontCollapseArgsInUsage);
self.set(AS::ContainsLast);
}
if let Some(l) = a.s.long {
if l == "version" {
self.unset(AS::NeedsLongVersion);
} else if l == "help" {
self.unset(AS::NeedsLongHelp);
}
}
}
// actually adds the arguments
pub fn add_arg(&mut self, a: Arg<'a, 'b>) {
// if it's global we have to clone anyways
if a.is_set(ArgSettings::Global) {
return self.add_arg_ref(&a);
}
debug_assert!(self.debug_asserts(&a));
self.add_conditional_reqs(&a);
self.add_arg_groups(&a);
self.add_reqs(&a);
self.implied_settings(&a);
if a.index.is_some() || (a.s.short.is_none() && a.s.long.is_none()) {
let i = if a.index.is_none() {
(self.positionals.len() + 1)
} else {
a.index.unwrap() as usize
};
self.positionals
.insert(i, PosBuilder::from_arg(a, i as u64));
} else if a.is_set(ArgSettings::TakesValue) {
let mut ob = OptBuilder::from(a);
ob.s.unified_ord = self.flags.len() + self.opts.len();
self.opts.push(ob);
} else {
let mut fb = FlagBuilder::from(a);
fb.s.unified_ord = self.flags.len() + self.opts.len();
self.flags.push(fb);
}
}
// actually adds the arguments but from a borrow (which means we have to do some clonine)
pub fn add_arg_ref(&mut self, a: &Arg<'a, 'b>) {
debug_assert!(self.debug_asserts(a));
self.add_conditional_reqs(a);
self.add_arg_groups(a);
self.add_reqs(a);
self.implied_settings(a);
if a.index.is_some() || (a.s.short.is_none() && a.s.long.is_none()) {
let i = if a.index.is_none() {
(self.positionals.len() + 1)
} else {
a.index.unwrap() as usize
};
let pb = PosBuilder::from_arg_ref(a, i as u64);
self.positionals.insert(i, pb);
} else if a.is_set(ArgSettings::TakesValue) {
let mut ob = OptBuilder::from(a);
ob.s.unified_ord = self.flags.len() + self.opts.len();
self.opts.push(ob);
} else {
let mut fb = FlagBuilder::from(a);
fb.s.unified_ord = self.flags.len() + self.opts.len();
self.flags.push(fb);
}
if a.is_set(ArgSettings::Global) {
self.global_args.push(a.into());
}
}
pub fn add_group(&mut self, group: ArgGroup<'a>) {
if group.required {
self.required.push(group.name);
if let Some(ref reqs) = group.requires {
self.required.extend_from_slice(reqs);
}
if let Some(ref bl) = group.conflicts {
self.blacklist.extend_from_slice(bl);
}
}
if self.groups.iter().any(|g| g.name == group.name) {
let grp = self.groups
.iter_mut()
.find(|g| g.name == group.name)
.expect(INTERNAL_ERROR_MSG);
grp.args.extend_from_slice(&group.args);
grp.requires = group.requires.clone();
grp.conflicts = group.conflicts.clone();
grp.required = group.required;
} else {
self.groups.push(group);
}
}
pub fn add_subcommand(&mut self, mut subcmd: App<'a, 'b>) {
debugln!("Parser::add_subcommand: term_w={:?}, name={}",
self.meta.term_w,
subcmd.p.meta.name);
subcmd.p.meta.term_w = self.meta.term_w;
if subcmd.p.meta.name == "help" {
self.unset(AS::NeedsSubcommandHelp);
}
self.subcommands.push(subcmd);
}
pub fn propogate_settings(&mut self) {
debugln!("Parser::propogate_settings: self={}, g_settings={:#?}",
self.meta.name,
self.g_settings);
for sc in &mut self.subcommands {
debugln!("Parser::propogate_settings: sc={}, settings={:#?}, g_settings={:#?}",
sc.p.meta.name,
sc.p.settings,
sc.p.g_settings);
// We have to create a new scope in order to tell rustc the borrow of `sc` is
// done and to recursively call this method
{
let vsc = self.settings.is_set(AS::VersionlessSubcommands);
let gv = self.settings.is_set(AS::GlobalVersion);
if vsc {
sc.p.set(AS::DisableVersion);
}
if gv && sc.p.meta.version.is_none() && self.meta.version.is_some() {
sc.p.set(AS::GlobalVersion);
sc.p.meta.version = Some(self.meta.version.unwrap());
}
sc.p.settings = sc.p.settings | self.g_settings;
sc.p.g_settings = sc.p.g_settings | self.g_settings;
sc.p.meta.term_w = self.meta.term_w;
sc.p.meta.max_w = self.meta.max_w;
}
sc.p.propogate_settings();
}
}
#[cfg_attr(feature = "lints", allow(needless_borrow))]
pub fn derive_display_order(&mut self) {
if self.is_set(AS::DeriveDisplayOrder) {
let unified = self.is_set(AS::UnifiedHelpMessage);
for (i, o) in self.opts
.iter_mut()
.enumerate()
.filter(|&(_, ref o)| o.s.disp_ord == 999) {
o.s.disp_ord = if unified { o.s.unified_ord } else { i };
}
for (i, f) in self.flags
.iter_mut()
.enumerate()
.filter(|&(_, ref f)| f.s.disp_ord == 999) {
f.s.disp_ord = if unified { f.s.unified_ord } else { i };
}
for (i, sc) in &mut self.subcommands
.iter_mut()
.enumerate()
.filter(|&(_, ref sc)| sc.p.meta.disp_ord == 999) {
sc.p.meta.disp_ord = i;
}
}
for sc in &mut self.subcommands {
sc.p.derive_display_order();
}
}
pub fn required(&self) -> Iter<&str> { self.required.iter() }
#[cfg_attr(feature = "lints", allow(needless_borrow))]
#[inline]
pub fn has_args(&self) -> bool {
!(self.flags.is_empty() && self.opts.is_empty() && self.positionals.is_empty())
}
#[inline]
pub fn has_opts(&self) -> bool { !self.opts.is_empty() }
#[inline]
pub fn has_flags(&self) -> bool { !self.flags.is_empty() }
#[inline]
pub fn has_positionals(&self) -> bool { !self.positionals.is_empty() }
#[inline]
pub fn has_subcommands(&self) -> bool { !self.subcommands.is_empty() }
#[inline]
pub fn has_visible_opts(&self) -> bool {
if self.opts.is_empty() {
return false;
}
self.opts.iter().any(|o| !o.is_set(ArgSettings::Hidden))
}
#[inline]
pub fn has_visible_flags(&self) -> bool {
if self.flags.is_empty() {
return false;
}
self.flags.iter().any(|f| !f.is_set(ArgSettings::Hidden))
}
#[inline]
pub fn has_visible_positionals(&self) -> bool {
if self.positionals.is_empty() {
return false;
}
self.positionals
.values()
.any(|p| !p.is_set(ArgSettings::Hidden))
}
#[inline]
pub fn has_visible_subcommands(&self) -> bool {
self.has_subcommands() && self.subcommands.iter().filter(|sc| sc.p.meta.name != "help").any(|sc| !sc.p.is_set(AS::Hidden))
}
#[inline]
pub fn is_set(&self, s: AS) -> bool { self.settings.is_set(s) }
#[inline]
pub fn set(&mut self, s: AS) { self.settings.set(s) }
#[inline]
pub fn unset(&mut self, s: AS) { self.settings.unset(s) }
#[cfg_attr(feature = "lints", allow(block_in_if_condition_stmt))]
pub fn verify_positionals(&mut self) -> bool {
// Because you must wait until all arguments have been supplied, this is the first chance
// to make assertions on positional argument indexes
//
// Firt we verify that the index highest supplied index, is equal to the number of
// positional arguments to verify there are no gaps (i.e. supplying an index of 1 and 3
// but no 2)
if let Some((idx, p)) = self.positionals.iter().rev().next() {
assert!(!(idx != self.positionals.len()),
"Found positional argument \"{}\" whose index is {} but there \
are only {} positional arguments defined",
p.b.name,
idx,
self.positionals.len());
}
// Next we verify that only the highest index has a .multiple(true) (if any)
if self.positionals
.values()
.any(|a| {
a.b.is_set(ArgSettings::Multiple) &&
(a.index as usize != self.positionals.len())
}) {
let mut it = self.positionals.values().rev();
let last = it.next().unwrap();
let second_to_last = it.next().unwrap();
// Either the final positional is required
// Or the second to last has a terminator or .last(true) set
let ok = last.is_set(ArgSettings::Required) ||
(second_to_last.v.terminator.is_some() ||
second_to_last.b.is_set(ArgSettings::Last)) ||
last.is_set(ArgSettings::Last);
assert!(ok,
"When using a positional argument with .multiple(true) that is *not the \
last* positional argument, the last positional argument (i.e the one \
with the highest index) *must* have .required(true) or .last(true) set.");
let ok = second_to_last.is_set(ArgSettings::Multiple) || last.is_set(ArgSettings::Last);
assert!(ok,
"Only the last positional argument, or second to last positional \
argument may be set to .multiple(true)");
let count = self.positionals
.values()
.filter(|p| p.b.settings.is_set(ArgSettings::Multiple) && p.v.num_vals.is_none())
.count();
let ok = count <= 1 ||
(last.is_set(ArgSettings::Last) && last.is_set(ArgSettings::Multiple) &&
second_to_last.is_set(ArgSettings::Multiple) &&
count == 2);
assert!(ok,
"Only one positional argument with .multiple(true) set is allowed per \
command, unless the second one also has .last(true) set");
}
if self.is_set(AS::AllowMissingPositional) {
// Check that if a required positional argument is found, all positions with a lower
// index are also required.
let mut found = false;
let mut foundx2 = false;
for p in self.positionals.values().rev() {
if foundx2 && !p.b.settings.is_set(ArgSettings::Required) {
assert!(p.b.is_set(ArgSettings::Required),
"Found positional argument which is not required with a lower \
index than a required positional argument by two or more: {:?} \
index {}",
p.b.name,
p.index);
} else if p.b.is_set(ArgSettings::Required) && !p.b.is_set(ArgSettings::Last) {
// Args that .last(true) don't count since they can be required and have
// positionals with a lower index that aren't required
// Imagine: prog <req1> [opt1] -- <req2>
// Both of these are valid invocations:
// $ prog r1 -- r2
// $ prog r1 o1 -- r2
if found {
foundx2 = true;
continue;
}
found = true;
continue;
} else {
found = false;
}
}
} else {
// Check that if a required positional argument is found, all positions with a lower
// index are also required
let mut found = false;
for p in self.positionals.values().rev() {
if found {
assert!(p.b.is_set(ArgSettings::Required),
"Found positional argument which is not required with a lower \
index than a required positional argument: {:?} index {}",
p.b.name,
p.index);
} else if p.b.is_set(ArgSettings::Required) && !p.b.is_set(ArgSettings::Last) {
// Args that .last(true) don't count since they can be required and have
// positionals with a lower index that aren't required
// Imagine: prog <req1> [opt1] -- <req2>
// Both of these are valid invocations:
// $ prog r1 -- r2
// $ prog r1 o1 -- r2
found = true;
continue;
}
}
}
if self.positionals
.values()
.any(|p| {
p.b.is_set(ArgSettings::Last) && p.b.is_set(ArgSettings::Required)
}) && self.has_subcommands() &&
!self.is_set(AS::SubcommandsNegateReqs) {
panic!("Having a required positional argument with .last(true) set *and* child \
subcommands without setting SubcommandsNegateReqs isn't compatible.");
}
true
}
pub fn propogate_globals(&mut self) {
for sc in &mut self.subcommands {
// We have to create a new scope in order to tell rustc the borrow of `sc` is
// done and to recursively call this method
{
for a in &self.global_args {
sc.p.add_arg_ref(a);
}
}
sc.p.propogate_globals();
}
}
// Checks if the arg matches a subcommand name, or any of it's aliases (if defined)
fn possible_subcommand(&self, arg_os: &OsStr) -> (bool, Option<&str>) {
debugln!("Parser::possible_subcommand: arg={:?}", arg_os);
fn starts(h: &str, n: &OsStr) -> bool {
#[cfg(not(target_os = "windows"))]
use std::os::unix::ffi::OsStrExt;
#[cfg(target_os = "windows")]
use osstringext::OsStrExt3;
let n_bytes = n.as_bytes();
let h_bytes = OsStr::new(h).as_bytes();
h_bytes.starts_with(n_bytes)
}
if self.is_set(AS::ArgsNegateSubcommands) && self.is_set(AS::ValidArgFound) {
return (false, None);
}
if !self.is_set(AS::InferSubcommands) {
if let Some(sc) = find_subcmd!(self, arg_os) {
return (true, Some(&sc.p.meta.name));
}
} else {
let v = self.subcommands
.iter()
.filter(|s| {
starts(&s.p.meta.name[..], &*arg_os) ||
(s.p.meta.aliases.is_some() &&
s.p
.meta
.aliases
.as_ref()
.unwrap()
.iter()
.filter(|&&(a, _)| starts(a, &*arg_os))
.count() == 1)
})
.map(|sc| &sc.p.meta.name)
.collect::<Vec<_>>();
if v.len() == 1 {
return (true, Some(v[0]));
}
}
(false, None)
}
fn parse_help_subcommand<I, T>(&self, it: &mut I) -> ClapResult<ParseResult<'a>>
where I: Iterator<Item = T>,
T: Into<OsString>
{
debugln!("Parser::parse_help_subcommand;");
let cmds: Vec<OsString> = it.map(|c| c.into()).collect();
let mut help_help = false;
let mut bin_name = self.meta
.bin_name
.as_ref()
.unwrap_or(&self.meta.name)
.clone();
let mut sc = {
let mut sc: &Parser = self;
for (i, cmd) in cmds.iter().enumerate() {
if &*cmd.to_string_lossy() == "help" {
// cmd help help
help_help = true;
}
if let Some(c) = sc.subcommands
.iter()
.find(|s| &*s.p.meta.name == cmd)
.map(|sc| &sc.p) {
sc = c;
if i == cmds.len() - 1 {
break;
}
} else if let Some(c) = sc.subcommands
.iter()
.find(|s| if let Some(ref als) = s.p.meta.aliases {
als.iter().any(|&(a, _)| a == &*cmd.to_string_lossy())
} else {
false
})
.map(|sc| &sc.p) {
sc = c;
if i == cmds.len() - 1 {
break;
}
} else {
return Err(Error::unrecognized_subcommand(cmd.to_string_lossy().into_owned(),
self.meta
.bin_name
.as_ref()
.unwrap_or(&self.meta.name),
self.color()));
}
bin_name = format!("{} {}", bin_name, &*sc.meta.name);
}
sc.clone()
};
if help_help {
let mut pb = PosBuilder::new("subcommand", 1);
pb.b.help = Some("The subcommand whose help message to display");
pb.set(ArgSettings::Multiple);
sc.positionals.insert(1, pb);
sc.settings = sc.settings | self.g_settings;
} else {
sc.create_help_and_version();
}
if sc.meta.bin_name != self.meta.bin_name {
sc.meta.bin_name = Some(format!("{} {}", bin_name, sc.meta.name));
}
Err(sc._help(false))
}
// allow wrong self convention due to self.valid_neg_num = true and it's a private method
#[cfg_attr(feature = "lints", allow(wrong_self_convention))]
fn is_new_arg(&mut self, arg_os: &OsStr, needs_val_of: ParseResult<'a>) -> bool {
debugln!("Parser::is_new_arg: arg={:?}, Needs Val of={:?}",
arg_os,
needs_val_of);
let app_wide_settings = if self.is_set(AS::AllowLeadingHyphen) {
true
} else if self.is_set(AS::AllowNegativeNumbers) {
let a = arg_os.to_string_lossy();
if a.parse::<i64>().is_ok() || a.parse::<f64>().is_ok() {
self.set(AS::ValidNegNumFound);
true
} else {
false
}
} else {
false
};
let arg_allows_tac = match needs_val_of {
ParseResult::Opt(name) => {
let o = self.opts
.iter()
.find(|o| o.b.name == name)
.expect(INTERNAL_ERROR_MSG);
(o.is_set(ArgSettings::AllowLeadingHyphen) || app_wide_settings)
}
ParseResult::Pos(name) => {
let p = self.positionals
.values()
.find(|p| p.b.name == name)
.expect(INTERNAL_ERROR_MSG);
(p.is_set(ArgSettings::AllowLeadingHyphen) || app_wide_settings)
}
_ => false,
};
debugln!("Parser::is_new_arg: Arg::allow_leading_hyphen({:?})",
arg_allows_tac);
// Is this a new argument, or values from a previous option?
let mut ret = if arg_os.starts_with(b"--") {
debugln!("Parser::is_new_arg: -- found");
if arg_os.len_() == 2 && !arg_allows_tac {
return true; // We have to return true so override everything else
} else if arg_allows_tac {
return false;
}
true
} else if arg_os.starts_with(b"-") {
debugln!("Parser::is_new_arg: - found");
// a singe '-' by itself is a value and typically means "stdin" on unix systems
!(arg_os.len_() == 1)
} else {
debugln!("Parser::is_new_arg: probably value");
false
};
ret = ret && !arg_allows_tac;
debugln!("Parser::is_new_arg: starts_new_arg={:?}", ret);
ret
}
// The actual parsing function
#[cfg_attr(feature = "lints", allow(while_let_on_iterator, collapsible_if))]
pub fn get_matches_with<I, T>(&mut self,
matcher: &mut ArgMatcher<'a>,
it: &mut Peekable<I>)
-> ClapResult<()>
where I: Iterator<Item = T>,
T: Into<OsString> + Clone
{
debugln!("Parser::get_matches_with;");
// Verify all positional assertions pass
debug_assert!(self.app_debug_asserts());
if self.positionals
.values()
.any(|a| {
a.b.is_set(ArgSettings::Multiple) &&
(a.index as usize != self.positionals.len())
}) &&
self.positionals
.values()
.last()
.map_or(false, |p| !p.is_set(ArgSettings::Last)) {
self.settings.set(AS::LowIndexMultiplePositional);
}
let has_args = self.has_args();
// Next we create the `--help` and `--version` arguments and add them if
// necessary
self.create_help_and_version();
let mut subcmd_name: Option<String> = None;
let mut needs_val_of: ParseResult<'a> = ParseResult::NotFound;
let mut pos_counter = 1;
while let Some(arg) = it.next() {
let arg_os = arg.into();
debugln!("Parser::get_matches_with: Begin parsing '{:?}' ({:?})",
arg_os,
&*arg_os.as_bytes());
self.unset(AS::ValidNegNumFound);
// Is this a new argument, or values from a previous option?
let starts_new_arg = self.is_new_arg(&arg_os, needs_val_of);
if arg_os.starts_with(b"--") && arg_os.len_() == 2 && starts_new_arg {
debugln!("Parser::get_matches_with: setting TrailingVals=true");
self.set(AS::TrailingValues);
continue;
}
// Has the user already passed '--'? Meaning only positional args follow
if !self.is_set(AS::TrailingValues) {
// Does the arg match a subcommand name, or any of it's aliases (if defined)
{
let (is_match, sc_name) = self.possible_subcommand(&arg_os);
debugln!("Parser::get_matches_with: possible_sc={:?}, sc={:?}",
is_match,
sc_name);
if is_match {
let sc_name = sc_name.expect(INTERNAL_ERROR_MSG);
if sc_name == "help" && self.is_set(AS::NeedsSubcommandHelp) {
self.parse_help_subcommand(it)?;
}
subcmd_name = Some(sc_name.to_owned());
break;
}
}
if !starts_new_arg {
if let ParseResult::Opt(name) = needs_val_of {
// Check to see if parsing a value from a previous arg
let arg = self.opts
.iter()
.find(|o| o.b.name == name)
.expect(INTERNAL_ERROR_MSG);
// get the OptBuilder so we can check the settings
needs_val_of = self.add_val_to_arg(arg, &arg_os, matcher)?;
// get the next value from the iterator
continue;
}
} else if arg_os.starts_with(b"--") {
needs_val_of = self.parse_long_arg(matcher, &arg_os)?;
debugln!("Parser:get_matches_with: After parse_long_arg {:?}",
needs_val_of);
match needs_val_of {
ParseResult::Flag |
ParseResult::Opt(..) |
ParseResult::ValuesDone => continue,
_ => (),
}
} else if arg_os.starts_with(b"-") && arg_os.len_() != 1 {
// Try to parse short args like normal, if AllowLeadingHyphen or
// AllowNegativeNumbers is set, parse_short_arg will *not* throw
// an error, and instead return Ok(None)
needs_val_of = self.parse_short_arg(matcher, &arg_os)?;
// If it's None, we then check if one of those two AppSettings was set
debugln!("Parser:get_matches_with: After parse_short_arg {:?}",
needs_val_of);
match needs_val_of {
ParseResult::MaybeNegNum => {
if !(arg_os.to_string_lossy().parse::<i64>().is_ok() ||
arg_os.to_string_lossy().parse::<f64>().is_ok()) {
return Err(Error::unknown_argument(&*arg_os.to_string_lossy(),
"",
&*usage::create_error_usage(self, matcher, None),
self.color()));
}
}
ParseResult::Opt(..) |
ParseResult::Flag |
ParseResult::ValuesDone => continue,
_ => (),
}
}
if !(self.is_set(AS::ArgsNegateSubcommands) && self.is_set(AS::ValidArgFound)) &&
!self.is_set(AS::InferSubcommands) {
if let Some(cdate) = suggestions::did_you_mean(&*arg_os.to_string_lossy(),
sc_names!(self)) {
return Err(Error::invalid_subcommand(arg_os
.to_string_lossy()
.into_owned(),
cdate,
self.meta
.bin_name
.as_ref()
.unwrap_or(&self.meta.name),
&*usage::create_error_usage(self,
matcher,
None),
self.color()));
}
}
}
let low_index_mults = self.is_set(AS::LowIndexMultiplePositional) &&
pos_counter == (self.positionals.len() - 1);
let missing_pos = self.is_set(AS::AllowMissingPositional) &&
pos_counter == (self.positionals.len() - 1);
debugln!("Parser::get_matches_with: Positional counter...{}",
pos_counter);
debugln!("Parser::get_matches_with: Low index multiples...{:?}",
low_index_mults);
if low_index_mults || missing_pos {
if let Some(na) = it.peek() {
let n = (*na).clone().into();
needs_val_of = if needs_val_of != ParseResult::ValuesDone {
if let Some(p) = self.positionals.get(pos_counter) {
ParseResult::Pos(p.b.name)
} else {
ParseResult::ValuesDone
}
} else {
ParseResult::ValuesDone
};
let sc_match = {
self.possible_subcommand(&n).0
};
if self.is_new_arg(&n, needs_val_of) || sc_match ||
suggestions::did_you_mean(&n.to_string_lossy(), sc_names!(self)).is_some() {
debugln!("Parser::get_matches_with: Bumping the positional counter...");
pos_counter += 1;
}
} else {
debugln!("Parser::get_matches_with: Bumping the positional counter...");
pos_counter += 1;
}
} else if self.is_set(AS::ContainsLast) && self.is_set(AS::TrailingValues) {
// Came to -- and one postional has .last(true) set, so we go immediately
// to the last (highest index) positional
debugln!("Parser::get_matches_with: .last(true) and --, setting last pos");
pos_counter = self.positionals.len();
}
if let Some(p) = self.positionals.get(pos_counter) {
if p.is_set(ArgSettings::Last) && !self.is_set(AS::TrailingValues) {
return Err(Error::unknown_argument(&*arg_os.to_string_lossy(),
"",
&*usage::create_error_usage(self,
matcher,
None),
self.color()));
}
parse_positional!(self, p, arg_os, pos_counter, matcher);
self.settings.set(AS::ValidArgFound);
} else if self.is_set(AS::AllowExternalSubcommands) {
// Get external subcommand name
let sc_name = match arg_os.to_str() {
Some(s) => s.to_string(),
None => {
if !self.is_set(AS::StrictUtf8) {
return Err(Error::invalid_utf8(&*usage::create_error_usage(self,
matcher,
None),
self.color()));
}
arg_os.to_string_lossy().into_owned()
}
};
// Collect the external subcommand args
let mut sc_m = ArgMatcher::new();
while let Some(v) = it.next() {
let a = v.into();
if a.to_str().is_none() && !self.is_set(AS::StrictUtf8) {