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extern crate syntex_syntax;
extern crate syntex_errors;
use syntex_syntax::parse::ParseSess;
use syntex_syntax::parse::parse_tts_from_source_str;
use std::io::prelude::*;
use std::fs::File;
pub use std::io::Error as IOErr;
pub use syntex_syntax::tokenstream::{TokenTree,Delimited,SequenceRepetition};
pub use syntex_syntax::parse::token::{Token,DelimToken};
pub use syntex_errors::DiagnosticBuilder;
pub enum Fault<'a> {
FileOpen(IOErr),
FileMeta(IOErr),
FileRead(IOErr),
SyntexErr(DiagnosticBuilder<'a>)
}
type TokenIter = ::std::vec::IntoIter<Token>;
pub fn sr( s: &SequenceRepetition ) -> TokenIter {
let mut v = Vec::with_capacity(100);
match s.separator {
Option::None => {
for t in s.tts.iter().flat_map(tt) {
v.push(t);
}
},
Option::Some(ref x) => {
for t in s.tts.iter().flat_map(tt) {
v.push(t);
v.push(x.clone());
}
v.pop();
}
};
v.into_iter()
}
pub fn dr(d: &Delimited) -> TokenIter {
let mut v = Vec::with_capacity(100);
v.push(Token::OpenDelim(d.delim.clone()));
for t in d.tts.iter().flat_map(tt) {
v.push(t);
}
v.push(Token::CloseDelim(d.delim.clone()));
v.into_iter()
}
pub fn tt(t: &TokenTree) -> TokenIter {
match t {
&TokenTree::Token(_,ref t) => vec![t.clone()].into_iter(),
&TokenTree::Delimited(_,ref x) => dr(x),
&TokenTree::Sequence(_,ref x) => sr(x)
}
}
pub fn flatten_token_tree(v: &Vec<TokenTree>) -> Vec<Token> {
v.iter().flat_map(tt).collect()
}
pub struct Parser {
p: ParseSess,
}
impl Parser {
pub fn new() -> Parser {
Parser {
p: ParseSess::new()
}
}
pub fn get_tokens<'a>(&'a self, path: &str) -> Result<Vec<Token>,Fault<'a>> {
let mut f = match File::open(path) {
Ok(x) => x,
Err(e) => return Err(Fault::FileOpen(e))
};
let len = match f.metadata() {
Ok(x) => x.len() as usize,
Err(e) => return Err(Fault::FileMeta(e))
};
let mut buffer = String::with_capacity(len+10);
match f.read_to_string(&mut buffer) {
Ok(_) => { },
Err(e) => return Err(Fault::FileRead(e))
};
match parse_tts_from_source_str("<anon>".to_string(), buffer, vec![],&self.p) {
Ok(ref x) => Ok(flatten_token_tree(x)),
Err(e) => Err(Fault::SyntexErr(e))
}
}
pub fn get_tokentree<'a>(&'a self, path: &str) -> Result<Vec<TokenTree>,Fault<'a>> {
let mut f = match File::open(path) {
Ok(x) => x,
Err(e) => return Err(Fault::FileOpen(e))
};
let len = match f.metadata() {
Ok(x) => x.len() as usize,
Err(e) => return Err(Fault::FileMeta(e))
};
let mut buffer = String::with_capacity(len+10);
match f.read_to_string(&mut buffer) {
Ok(_) => { },
Err(e) => return Err(Fault::FileRead(e))
};
match parse_tts_from_source_str("<anon>".to_string(), buffer, vec![],&self.p) {
Ok(x) => Ok(x),
Err(e) => Err(Fault::SyntexErr(e))
}
}
pub fn get_tokens_local<'a>(&'a self, code: &str) -> Result<Vec<Token>,Fault<'a>> {
match parse_tts_from_source_str("<anon>".to_string(), code.to_string(), vec![],&self.p) {
Ok(ref x) => Ok(flatten_token_tree(x)),
Err(e) => Err(Fault::SyntexErr(e))
}
}
pub fn get_tokenstree_local<'a>(&'a self, code: &str) -> Result<Vec<TokenTree>,Fault<'a>> {
match parse_tts_from_source_str("<anon>".to_string(), code.to_string(), vec![],&self.p) {
Ok(x) => Ok(x),
Err(e) => Err(Fault::SyntexErr(e))
}
}
}