/
lib.rs
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/
lib.rs
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//! Compiler plugin for Rust-PHF
//!
//! See the documentation for the `phf` crate for more details.
#![doc(html_root_url="http://sfackler.github.io/doc")]
#![feature(plugin_registrar, quote, default_type_params, macro_rules)]
#![feature(slicing_syntax)]
#![allow(unknown_features)]
extern crate rand;
extern crate syntax;
extern crate time;
extern crate rustc;
use std::collections::HashMap;
use std::collections::hashmap::{Occupied, Vacant};
use syntax::ast::{mod, TokenTree, LitStr, LitBinary, LitByte, LitChar, Expr, ExprLit};
use syntax::codemap::Span;
use syntax::ext::base::{DummyResult,
ExtCtxt,
MacResult};
use syntax::fold::Folder;
use syntax::parse;
use syntax::parse::token::{InternedString, COMMA, EOF, FAT_ARROW};
use syntax::print::pprust;
use rustc::plugin::Registry;
use util::{Entry, Key, KeyStr, KeyBinary, KeyChar, KeyU8, KeyI8, KeyU16};
use util::{KeyI16, KeyU32, KeyI32, KeyU64, KeyI64, KeyBool};
use util::{generate_hash, create_map, create_set, create_ordered_map, create_ordered_set};
#[path="../../shared/mod.rs"]
mod shared;
pub mod util;
#[plugin_registrar]
#[doc(hidden)]
pub fn macro_registrar(reg: &mut Registry) {
reg.register_macro("phf_map", expand_phf_map);
reg.register_macro("phf_set", expand_phf_set);
reg.register_macro("phf_ordered_map", expand_phf_ordered_map);
reg.register_macro("phf_ordered_set", expand_phf_ordered_set);
}
fn expand_phf_map(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult+'static> {
let entries = match parse_map(cx, tts) {
Some(entries) => entries,
None => return DummyResult::expr(sp)
};
if has_duplicates(cx, sp, entries[]) {
return DummyResult::expr(sp);
}
let state = generate_hash(cx, sp, entries[]);
create_map(cx, sp, entries, state)
}
fn expand_phf_set(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult+'static> {
let entries = match parse_set(cx, tts) {
Some(entries) => entries,
None => return DummyResult::expr(sp)
};
if has_duplicates(cx, sp, entries[]) {
return DummyResult::expr(sp);
}
let state = generate_hash(cx, sp, entries[]);
create_set(cx, sp, entries, state)
}
fn expand_phf_ordered_map(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult+'static> {
let entries = match parse_map(cx, tts) {
Some(entries) => entries,
None => return DummyResult::expr(sp),
};
if has_duplicates(cx, sp, entries[]) {
return DummyResult::expr(sp);
}
let state = generate_hash(cx, sp, entries[]);
create_ordered_map(cx, sp, entries, state)
}
fn expand_phf_ordered_set(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) -> Box<MacResult+'static> {
let entries = match parse_set(cx, tts) {
Some(entries) => entries,
None => return DummyResult::expr(sp)
};
if has_duplicates(cx, sp, entries[]) {
return DummyResult::expr(sp);
}
let state = generate_hash(cx, sp, entries[]);
create_ordered_set(cx, sp, entries, state)
}
fn parse_map(cx: &mut ExtCtxt, tts: &[TokenTree]) -> Option<Vec<Entry>> {
let mut parser = parse::new_parser_from_tts(cx.parse_sess(), cx.cfg(), tts.to_vec());
let mut entries = Vec::new();
let mut bad = false;
while parser.token != EOF {
let key = cx.expander().fold_expr(parser.parse_expr());
let key_contents = parse_key(cx, &*key).unwrap_or_else(|| {
bad = true;
KeyStr(InternedString::new(""))
});
if !parser.eat(&FAT_ARROW) {
cx.span_err(parser.span, "expected `=>`");
return None;
}
let value = parser.parse_expr();
entries.push(Entry {
key_contents: key_contents,
key: key,
value: value
});
if !parser.eat(&COMMA) && parser.token != EOF {
cx.span_err(parser.span, "expected `,`");
return None;
}
}
if bad {
return None;
}
Some(entries)
}
fn parse_set(cx: &mut ExtCtxt, tts: &[TokenTree]) -> Option<Vec<Entry>> {
let mut parser = parse::new_parser_from_tts(cx.parse_sess(), cx.cfg(), tts.to_vec());
let mut entries = Vec::new();
let value = quote_expr!(&*cx, ());
let mut bad = false;
while parser.token != EOF {
let key = cx.expander().fold_expr(parser.parse_expr());
let key_contents = parse_key(cx, &*key).unwrap_or_else(|| {
bad = true;
KeyStr(InternedString::new(""))
});
entries.push(Entry {
key_contents: key_contents,
key: key,
value: value.clone(),
});
if !parser.eat(&COMMA) && parser.token != EOF {
cx.span_err(parser.span, "expected `,`");
return None;
}
}
if bad {
return None;
}
Some(entries)
}
fn parse_key(cx: &mut ExtCtxt, e: &Expr) -> Option<Key> {
match e.node {
ExprLit(ref lit) => {
match lit.node {
ast::LitStr(ref s, _) => Some(KeyStr(s.clone())),
ast::LitBinary(ref b) => Some(KeyBinary(b.clone())),
ast::LitByte(b) => Some(KeyU8(b)),
ast::LitChar(c) => Some(KeyChar(c)),
ast::LitInt(i, ast::SignedIntLit(ast::TyI8, ast::Plus)) => Some(KeyI8(i as i8)),
ast::LitInt(i, ast::SignedIntLit(ast::TyI8, ast::Minus)) => Some(KeyI8(-(i as i8))),
ast::LitInt(i, ast::SignedIntLit(ast::TyI16, ast::Plus)) => Some(KeyI16(i as i16)),
ast::LitInt(i, ast::SignedIntLit(ast::TyI16, ast::Minus)) => Some(KeyI16(-(i as i16))),
ast::LitInt(i, ast::SignedIntLit(ast::TyI32, ast::Plus)) => Some(KeyI32(i as i32)),
ast::LitInt(i, ast::SignedIntLit(ast::TyI32, ast::Minus)) => Some(KeyI32(-(i as i32))),
ast::LitInt(i, ast::SignedIntLit(ast::TyI64, ast::Plus)) => Some(KeyI64(i as i64)),
ast::LitInt(i, ast::SignedIntLit(ast::TyI64, ast::Minus)) => Some(KeyI64(-(i as i64))),
ast::LitInt(i, ast::UnsignedIntLit(ast::TyU8)) => Some(KeyU8(i as u8)),
ast::LitInt(i, ast::UnsignedIntLit(ast::TyU16)) => Some(KeyU16(i as u16)),
ast::LitInt(i, ast::UnsignedIntLit(ast::TyU32)) => Some(KeyU32(i as u32)),
ast::LitInt(i, ast::UnsignedIntLit(ast::TyU64)) => Some(KeyU64(i as u64)),
ast::LitBool(b) => Some(KeyBool(b)),
_ => {
cx.span_err(e.span, "unsupported literal type");
None
}
}
}
_ => {
cx.span_err(e.span, "expected a literal");
None
}
}
}
fn has_duplicates(cx: &mut ExtCtxt, sp: Span, entries: &[Entry]) -> bool {
let mut dups = false;
let mut strings = HashMap::new();
for entry in entries.iter() {
let &(ref mut spans, _) = match strings.entry(&entry.key_contents) {
Occupied(e) => e.into_mut(),
Vacant(e) => e.set((vec![], &entry.key)),
};
spans.push(entry.key.span);
}
for &(ref spans, key) in strings.values() {
if spans.len() == 1 {
continue;
}
dups = true;
cx.span_err(sp, format!("duplicate key {}", pprust::expr_to_string(&**key))[]);
for span in spans.iter() {
cx.span_note(*span, "one occurrence here");
}
}
dups
}