c0d0a99c25
I've made an executive decision: Opt will be in charge of displaying the usage (help) information for the program. That will involve bringing the functionality delivered by Token into Opt. I've begun that process now.
103 lines
3.5 KiB
Rust
103 lines
3.5 KiB
Rust
/* Pirate - A command-line arrrrguments parser, written in Rust.
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* Copyright (C) 2015 Zachary Dziura
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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pub mod errors;
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pub mod lexer;
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pub mod matches;
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mod opts;
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use std::env::Args;
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pub use errors::{Error, ErrorKind};
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pub use matches::Matches;
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pub use lexer::{analyze, collect, Token};
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use opts::{opts, Opts};
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pub fn parse(mut args: Args, options: &[&'static str]) -> Result<Matches, Error> {
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let mut matches: Matches = Matches::new();
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let tokens = match lexer::collect(options) {
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Err(why) => return Err(why),
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Ok(t) => t
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};
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matches.tokens = tokens.clone();
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let mut opts: Opts = opts(&tokens);
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args.next(); // Remove the program name from the list of program arguments
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let mut next_arg = args.next();
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while next_arg.is_some() {
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let mut current_arg = next_arg.unwrap();
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let mut arg_vec: Vec<String> = Vec::new();
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// Determine if current opt is in short, long, or arg form
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if ¤t_arg[..1] == "-" {
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if ¤t_arg[..2] == "--" { // Long form opt
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arg_vec.push(String::from(¤t_arg[2..]));
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} else { // Short form opt
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// Assuming it's a group of short-form opts; e.g. tar -xzf
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for c in current_arg[1..].chars() {
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let mut s = String::new();
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s.push(c);
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arg_vec.push(s);
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}
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}
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for arg in arg_vec.iter() {
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if opts.contains_opt(&arg) {
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let has_arg: bool = *opts.get_opt(&arg).unwrap();
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if has_arg {
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// NOTE: The corresponding arg MUST be immediately following
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current_arg = match args.next() {
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None => {
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let arg_ = (*arg).clone();
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return Err(Error::new(ErrorKind::MissingArgument, arg_));
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},
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Some(a) => a
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};
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matches.insert(&arg, ¤t_arg);
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} else {
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matches.insert(&arg, "");
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}
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} else {
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let arg_ = (*arg).clone();
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return Err(Error::new(ErrorKind::InvalidArgument, arg_));
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}
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}
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} else { // Probably a required arg
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let arg_name: String = opts.get_arg().unwrap();
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matches.insert(&arg_name, ¤t_arg);
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}
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next_arg = args.next();
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}
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match opts.arg_len() {
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0 => Ok(matches),
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_ => Err(Error::new(ErrorKind::MissingArgument, opts.get_arg().unwrap())),
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}
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}
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pub fn help(tokens: &Vec<lexer::Token>, program_name: &str, program_desc: &str) {
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println!("{} - {}", program_name, program_desc);
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for token in tokens.iter() {
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println!("{}", token);
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}
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}
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