885 lines
36 KiB
Rust
885 lines
36 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use ast;
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use ast::P;
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use codemap::{Span, respan};
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use ext::base::*;
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use ext::base;
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use ext::build::AstBuilder;
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use parse::token::InternedString;
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use parse::token;
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use rsparse = parse;
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use std::fmt::parse;
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use collections::{HashMap, HashSet};
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use std::slice;
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#[deriving(Eq)]
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enum ArgumentType {
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Known(~str),
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Unsigned,
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String,
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}
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enum Position {
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Exact(uint),
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Named(~str),
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}
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struct Context<'a, 'b> {
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ecx: &'a mut ExtCtxt<'b>,
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fmtsp: Span,
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// Parsed argument expressions and the types that we've found so far for
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// them.
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args: Vec<@ast::Expr>,
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arg_types: Vec<Option<ArgumentType>>,
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// Parsed named expressions and the types that we've found for them so far.
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// Note that we keep a side-array of the ordering of the named arguments
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// found to be sure that we can translate them in the same order that they
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// were declared in.
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names: HashMap<~str, @ast::Expr>,
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name_types: HashMap<~str, ArgumentType>,
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name_ordering: Vec<~str>,
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// Collection of the compiled `rt::Piece` structures
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pieces: Vec<@ast::Expr> ,
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name_positions: HashMap<~str, uint>,
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method_statics: Vec<@ast::Item> ,
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// Updated as arguments are consumed or methods are entered
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nest_level: uint,
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next_arg: uint,
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}
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/// Parses the arguments from the given list of tokens, returning None
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/// if there's a parse error so we can continue parsing other format!
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/// expressions.
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///
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/// If parsing succeeds, the second return value is:
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///
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/// Some((fmtstr, unnamed arguments, ordering of named arguments,
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/// named arguments))
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fn parse_args(ecx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree])
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-> (@ast::Expr, Option<(@ast::Expr, Vec<@ast::Expr>, Vec<~str>,
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HashMap<~str, @ast::Expr>)>) {
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let mut args = Vec::new();
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let mut names = HashMap::<~str, @ast::Expr>::new();
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let mut order = Vec::new();
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let mut p = rsparse::new_parser_from_tts(ecx.parse_sess(),
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ecx.cfg(),
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tts.iter()
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.map(|x| (*x).clone())
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.collect());
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// Parse the leading function expression (maybe a block, maybe a path)
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let extra = p.parse_expr();
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if !p.eat(&token::COMMA) {
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ecx.span_err(sp, "expected token: `,`");
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return (extra, None);
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}
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if p.token == token::EOF {
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ecx.span_err(sp, "requires at least a format string argument");
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return (extra, None);
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}
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let fmtstr = p.parse_expr();
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let mut named = false;
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while p.token != token::EOF {
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if !p.eat(&token::COMMA) {
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ecx.span_err(sp, "expected token: `,`");
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return (extra, None);
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}
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if p.token == token::EOF { break } // accept trailing commas
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if named || (token::is_ident(&p.token) &&
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p.look_ahead(1, |t| *t == token::EQ)) {
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named = true;
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let ident = match p.token {
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token::IDENT(i, _) => {
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p.bump();
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i
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}
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_ if named => {
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ecx.span_err(p.span,
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"expected ident, positional arguments \
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cannot follow named arguments");
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return (extra, None);
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}
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_ => {
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ecx.span_err(p.span,
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format!("expected ident for named argument, but found `{}`",
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p.this_token_to_str()));
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return (extra, None);
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}
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};
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let interned_name = token::get_ident(ident);
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let name = interned_name.get();
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p.expect(&token::EQ);
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let e = p.parse_expr();
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match names.find_equiv(&name) {
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None => {}
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Some(prev) => {
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ecx.span_err(e.span, format!("duplicate argument named `{}`", name));
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ecx.parse_sess.span_diagnostic.span_note(prev.span, "previously here");
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continue
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}
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}
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order.push(name.to_str());
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names.insert(name.to_str(), e);
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} else {
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args.push(p.parse_expr());
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}
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}
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return (extra, Some((fmtstr, args, order, names)));
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}
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impl<'a, 'b> Context<'a, 'b> {
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/// Verifies one piece of a parse string. All errors are not emitted as
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/// fatal so we can continue giving errors about this and possibly other
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/// format strings.
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fn verify_piece(&mut self, p: &parse::Piece) {
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match *p {
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parse::String(..) => {}
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parse::CurrentArgument => {
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if self.nest_level == 0 {
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self.ecx.span_err(self.fmtsp,
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"`#` reference used with nothing to \
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reference back to");
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}
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}
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parse::Argument(ref arg) => {
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// width/precision first, if they have implicit positional
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// parameters it makes more sense to consume them first.
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self.verify_count(arg.format.width);
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self.verify_count(arg.format.precision);
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// argument second, if it's an implicit positional parameter
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// it's written second, so it should come after width/precision.
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let pos = match arg.position {
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parse::ArgumentNext => {
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let i = self.next_arg;
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if self.check_positional_ok() {
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self.next_arg += 1;
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}
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Exact(i)
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}
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parse::ArgumentIs(i) => Exact(i),
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parse::ArgumentNamed(s) => Named(s.to_str()),
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};
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// and finally the method being applied
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match arg.method {
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None => {
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let ty = Known(arg.format.ty.to_str());
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self.verify_arg_type(pos, ty);
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}
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Some(ref method) => { self.verify_method(pos, *method); }
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}
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}
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}
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}
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fn verify_pieces(&mut self, pieces: &[parse::Piece]) {
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for piece in pieces.iter() {
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self.verify_piece(piece);
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}
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}
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fn verify_count(&mut self, c: parse::Count) {
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match c {
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parse::CountImplied | parse::CountIs(..) => {}
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parse::CountIsParam(i) => {
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self.verify_arg_type(Exact(i), Unsigned);
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}
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parse::CountIsName(s) => {
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self.verify_arg_type(Named(s.to_str()), Unsigned);
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}
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parse::CountIsNextParam => {
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if self.check_positional_ok() {
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self.verify_arg_type(Exact(self.next_arg), Unsigned);
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self.next_arg += 1;
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}
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}
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}
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}
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fn check_positional_ok(&mut self) -> bool {
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if self.nest_level != 0 {
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self.ecx.span_err(self.fmtsp, "cannot use implicit positional \
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arguments nested inside methods");
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false
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} else {
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true
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}
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}
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fn verify_method(&mut self, pos: Position, m: &parse::Method) {
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self.nest_level += 1;
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match *m {
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parse::Plural(_, ref arms, ref default) => {
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let mut seen_cases = HashSet::new();
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self.verify_arg_type(pos, Unsigned);
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for arm in arms.iter() {
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if !seen_cases.insert(arm.selector) {
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match arm.selector {
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parse::Keyword(name) => {
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self.ecx.span_err(self.fmtsp,
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format!("duplicate selector \
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`{:?}`", name));
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}
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parse::Literal(idx) => {
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self.ecx.span_err(self.fmtsp,
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format!("duplicate selector \
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`={}`", idx));
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}
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}
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}
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self.verify_pieces(arm.result);
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}
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self.verify_pieces(*default);
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}
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parse::Select(ref arms, ref default) => {
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self.verify_arg_type(pos, String);
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let mut seen_cases = HashSet::new();
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for arm in arms.iter() {
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if !seen_cases.insert(arm.selector) {
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self.ecx.span_err(self.fmtsp,
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format!("duplicate selector `{}`",
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arm.selector));
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} else if arm.selector == "" {
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self.ecx.span_err(self.fmtsp,
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"empty selector in `select`");
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}
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self.verify_pieces(arm.result);
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}
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self.verify_pieces(*default);
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}
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}
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self.nest_level -= 1;
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}
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fn verify_arg_type(&mut self, arg: Position, ty: ArgumentType) {
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match arg {
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Exact(arg) => {
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if arg < 0 || self.args.len() <= arg {
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let msg = format!("invalid reference to argument `{}` (there \
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are {} arguments)", arg, self.args.len());
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self.ecx.span_err(self.fmtsp, msg);
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return;
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}
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{
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let arg_type = match self.arg_types.get(arg) {
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&None => None,
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&Some(ref x) => Some(x)
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};
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self.verify_same(self.args.get(arg).span, &ty, arg_type);
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}
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if self.arg_types.get(arg).is_none() {
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*self.arg_types.get_mut(arg) = Some(ty);
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}
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}
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Named(name) => {
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let span = match self.names.find(&name) {
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Some(e) => e.span,
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None => {
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let msg = format!("there is no argument named `{}`", name);
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self.ecx.span_err(self.fmtsp, msg);
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return;
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}
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};
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self.verify_same(span, &ty, self.name_types.find(&name));
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if !self.name_types.contains_key(&name) {
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self.name_types.insert(name.clone(), ty);
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}
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// Assign this named argument a slot in the arguments array if
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// it hasn't already been assigned a slot.
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if !self.name_positions.contains_key(&name) {
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let slot = self.name_positions.len();
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self.name_positions.insert(name, slot);
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}
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}
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}
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}
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/// When we're keeping track of the types that are declared for certain
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/// arguments, we assume that `None` means we haven't seen this argument
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/// yet, `Some(None)` means that we've seen the argument, but no format was
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/// specified, and `Some(Some(x))` means that the argument was declared to
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/// have type `x`.
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///
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/// Obviously `Some(Some(x)) != Some(Some(y))`, but we consider it true
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/// that: `Some(None) == Some(Some(x))`
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fn verify_same(&self,
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sp: Span,
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ty: &ArgumentType,
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before: Option<&ArgumentType>) {
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let cur = match before {
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None => return,
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Some(t) => t,
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};
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if *ty == *cur {
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return
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}
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match (cur, ty) {
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(&Known(ref cur), &Known(ref ty)) => {
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self.ecx.span_err(sp,
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format!("argument redeclared with type `{}` when \
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it was previously `{}`",
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*ty,
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*cur));
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}
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(&Known(ref cur), _) => {
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self.ecx.span_err(sp,
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format!("argument used to format with `{}` was \
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attempted to not be used for formatting",
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*cur));
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}
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(_, &Known(ref ty)) => {
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self.ecx.span_err(sp,
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format!("argument previously used as a format \
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argument attempted to be used as `{}`",
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*ty));
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}
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(_, _) => {
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self.ecx.span_err(sp, "argument declared with multiple formats");
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}
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}
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}
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/// These attributes are applied to all statics that this syntax extension
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/// will generate.
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fn static_attrs(&self) -> Vec<ast::Attribute> {
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// Flag statics as `address_insignificant` so LLVM can merge duplicate
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// globals as much as possible (which we're generating a whole lot of).
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let unnamed = self.ecx
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.meta_word(self.fmtsp,
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InternedString::new(
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"address_insignificant"));
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let unnamed = self.ecx.attribute(self.fmtsp, unnamed);
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// Do not warn format string as dead code
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let dead_code = self.ecx.meta_word(self.fmtsp,
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InternedString::new("dead_code"));
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let allow_dead_code = self.ecx.meta_list(self.fmtsp,
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InternedString::new("allow"),
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vec!(dead_code));
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let allow_dead_code = self.ecx.attribute(self.fmtsp, allow_dead_code);
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return vec!(unnamed, allow_dead_code);
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}
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fn parsepath(&self, s: &str) -> Vec<ast::Ident> {
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vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
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self.ecx.ident_of("parse"), self.ecx.ident_of(s))
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}
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fn rtpath(&self, s: &str) -> Vec<ast::Ident> {
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vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
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self.ecx.ident_of("rt"), self.ecx.ident_of(s))
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}
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fn ctpath(&self, s: &str) -> Vec<ast::Ident> {
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vec!(self.ecx.ident_of("std"), self.ecx.ident_of("fmt"),
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self.ecx.ident_of("parse"), self.ecx.ident_of(s))
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}
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fn none(&self) -> @ast::Expr {
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let none = self.ecx.path_global(self.fmtsp, vec!(
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self.ecx.ident_of("std"),
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self.ecx.ident_of("option"),
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self.ecx.ident_of("None")));
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self.ecx.expr_path(none)
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}
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fn some(&self, e: @ast::Expr) -> @ast::Expr {
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let p = self.ecx.path_global(self.fmtsp, vec!(
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self.ecx.ident_of("std"),
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self.ecx.ident_of("option"),
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self.ecx.ident_of("Some")));
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let p = self.ecx.expr_path(p);
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self.ecx.expr_call(self.fmtsp, p, vec!(e))
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}
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fn trans_count(&self, c: parse::Count) -> @ast::Expr {
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let sp = self.fmtsp;
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match c {
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parse::CountIs(i) => {
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self.ecx.expr_call_global(sp, self.rtpath("CountIs"),
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vec!(self.ecx.expr_uint(sp, i)))
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}
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parse::CountIsParam(i) => {
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self.ecx.expr_call_global(sp, self.rtpath("CountIsParam"),
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vec!(self.ecx.expr_uint(sp, i)))
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}
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parse::CountImplied => {
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let path = self.ecx.path_global(sp, self.rtpath("CountImplied"));
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self.ecx.expr_path(path)
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}
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parse::CountIsNextParam => {
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let path = self.ecx.path_global(sp, self.rtpath("CountIsNextParam"));
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self.ecx.expr_path(path)
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}
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parse::CountIsName(n) => {
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let i = match self.name_positions.find_equiv(&n) {
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Some(&i) => i,
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None => 0, // error already emitted elsewhere
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};
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let i = i + self.args.len();
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self.ecx.expr_call_global(sp, self.rtpath("CountIsParam"),
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vec!(self.ecx.expr_uint(sp, i)))
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}
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}
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}
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fn trans_method(&mut self, method: &parse::Method) -> @ast::Expr {
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let sp = self.fmtsp;
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let method = match *method {
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parse::Select(ref arms, ref default) => {
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let arms = arms.iter().map(|arm| {
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let p = self.ecx.path_global(sp, self.rtpath("SelectArm"));
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let result = arm.result.iter().map(|p| {
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self.trans_piece(p)
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}).collect();
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let s = token::intern_and_get_ident(arm.selector);
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let selector = self.ecx.expr_str(sp, s);
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self.ecx.expr_struct(sp, p, vec!(
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self.ecx.field_imm(sp,
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self.ecx.ident_of("selector"),
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selector),
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self.ecx.field_imm(sp, self.ecx.ident_of("result"),
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self.ecx.expr_vec_slice(sp, result))))
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}).collect();
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let default = default.iter().map(|p| {
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self.trans_piece(p)
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}).collect();
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self.ecx.expr_call_global(sp, self.rtpath("Select"), vec!(
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self.ecx.expr_vec_slice(sp, arms),
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self.ecx.expr_vec_slice(sp, default)))
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}
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parse::Plural(offset, ref arms, ref default) => {
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let offset = match offset {
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Some(i) => { self.some(self.ecx.expr_uint(sp, i)) }
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None => { self.none() }
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};
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let arms = arms.iter().map(|arm| {
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let p = self.ecx.path_global(sp, self.rtpath("PluralArm"));
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let result = arm.result.iter().map(|p| {
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self.trans_piece(p)
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}).collect();
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let (lr, selarg) = match arm.selector {
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parse::Keyword(t) => {
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let p = self.ctpath(format!("{:?}", t));
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let p = self.ecx.path_global(sp, p);
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(self.rtpath("Keyword"), self.ecx.expr_path(p))
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}
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parse::Literal(i) => {
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(self.rtpath("Literal"), self.ecx.expr_uint(sp, i))
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}
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};
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let selector = self.ecx.expr_call_global(sp,
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lr, vec!(selarg));
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self.ecx.expr_struct(sp, p, vec!(
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self.ecx.field_imm(sp,
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self.ecx.ident_of("selector"),
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selector),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("result"),
|
|
self.ecx.expr_vec_slice(sp, result))))
|
|
}).collect();
|
|
let default = default.iter().map(|p| {
|
|
self.trans_piece(p)
|
|
}).collect();
|
|
self.ecx.expr_call_global(sp, self.rtpath("Plural"), vec!(
|
|
offset,
|
|
self.ecx.expr_vec_slice(sp, arms),
|
|
self.ecx.expr_vec_slice(sp, default)))
|
|
}
|
|
};
|
|
let life = self.ecx.lifetime(sp, self.ecx.ident_of("static").name);
|
|
let ty = self.ecx.ty_path(self.ecx.path_all(
|
|
sp,
|
|
true,
|
|
self.rtpath("Method"),
|
|
vec!(life),
|
|
Vec::new()
|
|
), None);
|
|
let st = ast::ItemStatic(ty, ast::MutImmutable, method);
|
|
let static_name = self.ecx.ident_of(format!("__STATIC_METHOD_{}",
|
|
self.method_statics.len()));
|
|
let item = self.ecx.item(sp, static_name, self.static_attrs(), st);
|
|
self.method_statics.push(item);
|
|
self.ecx.expr_ident(sp, static_name)
|
|
}
|
|
|
|
/// Translate a `parse::Piece` to a static `rt::Piece`
|
|
fn trans_piece(&mut self, piece: &parse::Piece) -> @ast::Expr {
|
|
let sp = self.fmtsp;
|
|
match *piece {
|
|
parse::String(s) => {
|
|
let s = token::intern_and_get_ident(s);
|
|
self.ecx.expr_call_global(sp,
|
|
self.rtpath("String"),
|
|
vec!(
|
|
self.ecx.expr_str(sp, s)
|
|
))
|
|
}
|
|
parse::CurrentArgument => {
|
|
let nil = self.ecx.expr_lit(sp, ast::LitNil);
|
|
self.ecx.expr_call_global(sp, self.rtpath("CurrentArgument"), vec!(nil))
|
|
}
|
|
parse::Argument(ref arg) => {
|
|
// Translate the position
|
|
let pos = match arg.position {
|
|
// These two have a direct mapping
|
|
parse::ArgumentNext => {
|
|
let path = self.ecx.path_global(sp,
|
|
self.rtpath("ArgumentNext"));
|
|
self.ecx.expr_path(path)
|
|
}
|
|
parse::ArgumentIs(i) => {
|
|
self.ecx.expr_call_global(sp, self.rtpath("ArgumentIs"),
|
|
vec!(self.ecx.expr_uint(sp, i)))
|
|
}
|
|
// Named arguments are converted to positional arguments at
|
|
// the end of the list of arguments
|
|
parse::ArgumentNamed(n) => {
|
|
let i = match self.name_positions.find_equiv(&n) {
|
|
Some(&i) => i,
|
|
None => 0, // error already emitted elsewhere
|
|
};
|
|
let i = i + self.args.len();
|
|
self.ecx.expr_call_global(sp, self.rtpath("ArgumentIs"),
|
|
vec!(self.ecx.expr_uint(sp, i)))
|
|
}
|
|
};
|
|
|
|
// Translate the format
|
|
let fill = match arg.format.fill { Some(c) => c, None => ' ' };
|
|
let fill = self.ecx.expr_lit(sp, ast::LitChar(fill as u32));
|
|
let align = match arg.format.align {
|
|
parse::AlignLeft => {
|
|
self.ecx.path_global(sp, self.parsepath("AlignLeft"))
|
|
}
|
|
parse::AlignRight => {
|
|
self.ecx.path_global(sp, self.parsepath("AlignRight"))
|
|
}
|
|
parse::AlignUnknown => {
|
|
self.ecx.path_global(sp, self.parsepath("AlignUnknown"))
|
|
}
|
|
};
|
|
let align = self.ecx.expr_path(align);
|
|
let flags = self.ecx.expr_uint(sp, arg.format.flags);
|
|
let prec = self.trans_count(arg.format.precision);
|
|
let width = self.trans_count(arg.format.width);
|
|
let path = self.ecx.path_global(sp, self.rtpath("FormatSpec"));
|
|
let fmt = self.ecx.expr_struct(sp, path, vec!(
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("fill"), fill),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("align"), align),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("flags"), flags),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("precision"), prec),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("width"), width)));
|
|
|
|
// Translate the method (if any)
|
|
let method = match arg.method {
|
|
None => { self.none() }
|
|
Some(ref m) => {
|
|
let m = self.trans_method(*m);
|
|
self.some(self.ecx.expr_addr_of(sp, m))
|
|
}
|
|
};
|
|
let path = self.ecx.path_global(sp, self.rtpath("Argument"));
|
|
let s = self.ecx.expr_struct(sp, path, vec!(
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("position"), pos),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("format"), fmt),
|
|
self.ecx.field_imm(sp, self.ecx.ident_of("method"), method)));
|
|
self.ecx.expr_call_global(sp, self.rtpath("Argument"), vec!(s))
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Actually builds the expression which the iformat! block will be expanded
|
|
/// to
|
|
fn to_expr(&self, extra: @ast::Expr) -> @ast::Expr {
|
|
let mut lets = Vec::new();
|
|
let mut locals = Vec::new();
|
|
let mut names = slice::from_fn(self.name_positions.len(), |_| None);
|
|
let mut pats = Vec::new();
|
|
let mut heads = Vec::new();
|
|
|
|
// First, declare all of our methods that are statics
|
|
for &method in self.method_statics.iter() {
|
|
let decl = respan(self.fmtsp, ast::DeclItem(method));
|
|
lets.push(@respan(self.fmtsp,
|
|
ast::StmtDecl(@decl, ast::DUMMY_NODE_ID)));
|
|
}
|
|
|
|
// Next, build up the static array which will become our precompiled
|
|
// format "string"
|
|
let fmt = self.ecx.expr_vec(self.fmtsp, self.pieces.clone());
|
|
let piece_ty = self.ecx.ty_path(self.ecx.path_all(
|
|
self.fmtsp,
|
|
true, vec!(
|
|
self.ecx.ident_of("std"),
|
|
self.ecx.ident_of("fmt"),
|
|
self.ecx.ident_of("rt"),
|
|
self.ecx.ident_of("Piece")),
|
|
vec!(self.ecx.lifetime(self.fmtsp,
|
|
self.ecx.ident_of("static").name)),
|
|
Vec::new()
|
|
), None);
|
|
let ty = ast::TyFixedLengthVec(
|
|
piece_ty,
|
|
self.ecx.expr_uint(self.fmtsp, self.pieces.len())
|
|
);
|
|
let ty = self.ecx.ty(self.fmtsp, ty);
|
|
let st = ast::ItemStatic(ty, ast::MutImmutable, fmt);
|
|
let static_name = self.ecx.ident_of("__STATIC_FMTSTR");
|
|
let item = self.ecx.item(self.fmtsp, static_name,
|
|
self.static_attrs(), st);
|
|
let decl = respan(self.fmtsp, ast::DeclItem(item));
|
|
lets.push(@respan(self.fmtsp, ast::StmtDecl(@decl, ast::DUMMY_NODE_ID)));
|
|
|
|
// Right now there is a bug such that for the expression:
|
|
// foo(bar(&1))
|
|
// the lifetime of `1` doesn't outlast the call to `bar`, so it's not
|
|
// vald for the call to `foo`. To work around this all arguments to the
|
|
// format! string are shoved into locals. Furthermore, we shove the address
|
|
// of each variable because we don't want to move out of the arguments
|
|
// passed to this function.
|
|
for (i, &e) in self.args.iter().enumerate() {
|
|
if self.arg_types.get(i).is_none() {
|
|
continue // error already generated
|
|
}
|
|
|
|
let name = self.ecx.ident_of(format!("__arg{}", i));
|
|
pats.push(self.ecx.pat_ident(e.span, name));
|
|
heads.push(self.ecx.expr_addr_of(e.span, e));
|
|
locals.push(self.format_arg(e.span, Exact(i),
|
|
self.ecx.expr_ident(e.span, name)));
|
|
}
|
|
for name in self.name_ordering.iter() {
|
|
let e = match self.names.find(name) {
|
|
Some(&e) if self.name_types.contains_key(name) => e,
|
|
Some(..) | None => continue
|
|
};
|
|
|
|
let lname = self.ecx.ident_of(format!("__arg{}", *name));
|
|
pats.push(self.ecx.pat_ident(e.span, lname));
|
|
heads.push(self.ecx.expr_addr_of(e.span, e));
|
|
names[*self.name_positions.get(name)] =
|
|
Some(self.format_arg(e.span,
|
|
Named((*name).clone()),
|
|
self.ecx.expr_ident(e.span, lname)));
|
|
}
|
|
|
|
// Now create a vector containing all the arguments
|
|
let slicename = self.ecx.ident_of("__args_vec");
|
|
{
|
|
let args = names.move_iter().map(|a| a.unwrap());
|
|
let mut args = locals.move_iter().chain(args);
|
|
let args = self.ecx.expr_vec_slice(self.fmtsp, args.collect());
|
|
lets.push(self.ecx.stmt_let(self.fmtsp, false, slicename, args));
|
|
}
|
|
|
|
// Now create the fmt::Arguments struct with all our locals we created.
|
|
let fmt = self.ecx.expr_ident(self.fmtsp, static_name);
|
|
let args_slice = self.ecx.expr_ident(self.fmtsp, slicename);
|
|
let result = self.ecx.expr_call_global(self.fmtsp, vec!(
|
|
self.ecx.ident_of("std"),
|
|
self.ecx.ident_of("fmt"),
|
|
self.ecx.ident_of("Arguments"),
|
|
self.ecx.ident_of("new")), vec!(fmt, args_slice));
|
|
|
|
// We did all the work of making sure that the arguments
|
|
// structure is safe, so we can safely have an unsafe block.
|
|
let result = self.ecx.expr_block(P(ast::Block {
|
|
view_items: Vec::new(),
|
|
stmts: Vec::new(),
|
|
expr: Some(result),
|
|
id: ast::DUMMY_NODE_ID,
|
|
rules: ast::UnsafeBlock(ast::CompilerGenerated),
|
|
span: self.fmtsp,
|
|
}));
|
|
let resname = self.ecx.ident_of("__args");
|
|
lets.push(self.ecx.stmt_let(self.fmtsp, false, resname, result));
|
|
let res = self.ecx.expr_ident(self.fmtsp, resname);
|
|
let result = self.ecx.expr_call(extra.span, extra, vec!(
|
|
self.ecx.expr_addr_of(extra.span, res)));
|
|
let body = self.ecx.expr_block(self.ecx.block(self.fmtsp, lets,
|
|
Some(result)));
|
|
|
|
// Constructs an AST equivalent to:
|
|
//
|
|
// match (&arg0, &arg1) {
|
|
// (tmp0, tmp1) => body
|
|
// }
|
|
//
|
|
// It was:
|
|
//
|
|
// let tmp0 = &arg0;
|
|
// let tmp1 = &arg1;
|
|
// body
|
|
//
|
|
// Because of #11585 the new temporary lifetime rule, the enclosing
|
|
// statements for these temporaries become the let's themselves.
|
|
// If one or more of them are RefCell's, RefCell borrow() will also
|
|
// end there; they don't last long enough for body to use them. The
|
|
// match expression solves the scope problem.
|
|
//
|
|
// Note, it may also very well be transformed to:
|
|
//
|
|
// match arg0 {
|
|
// ref tmp0 => {
|
|
// match arg1 => {
|
|
// ref tmp1 => body } } }
|
|
//
|
|
// But the nested match expression is proved to perform not as well
|
|
// as series of let's; the first approach does.
|
|
let pat = self.ecx.pat(self.fmtsp, ast::PatTup(pats));
|
|
let arm = self.ecx.arm(self.fmtsp, vec!(pat), body);
|
|
let head = self.ecx.expr(self.fmtsp, ast::ExprTup(heads));
|
|
self.ecx.expr_match(self.fmtsp, head, vec!(arm))
|
|
}
|
|
|
|
fn format_arg(&self, sp: Span, argno: Position, arg: @ast::Expr)
|
|
-> @ast::Expr {
|
|
let ty = match argno {
|
|
Exact(ref i) => self.arg_types.get(*i).get_ref(),
|
|
Named(ref s) => self.name_types.get(s)
|
|
};
|
|
|
|
let fmt_fn = match *ty {
|
|
Known(ref tyname) => {
|
|
match tyname.as_slice() {
|
|
"" => "secret_show",
|
|
"?" => "secret_poly",
|
|
"b" => "secret_bool",
|
|
"c" => "secret_char",
|
|
"d" | "i" => "secret_signed",
|
|
"e" => "secret_lower_exp",
|
|
"E" => "secret_upper_exp",
|
|
"f" => "secret_float",
|
|
"o" => "secret_octal",
|
|
"p" => "secret_pointer",
|
|
"s" => "secret_string",
|
|
"t" => "secret_binary",
|
|
"u" => "secret_unsigned",
|
|
"x" => "secret_lower_hex",
|
|
"X" => "secret_upper_hex",
|
|
_ => {
|
|
self.ecx.span_err(sp, format!("unknown format trait `{}`",
|
|
*tyname));
|
|
"dummy"
|
|
}
|
|
}
|
|
}
|
|
String => {
|
|
return self.ecx.expr_call_global(sp, vec!(
|
|
self.ecx.ident_of("std"),
|
|
self.ecx.ident_of("fmt"),
|
|
self.ecx.ident_of("argumentstr")), vec!(arg))
|
|
}
|
|
Unsigned => {
|
|
return self.ecx.expr_call_global(sp, vec!(
|
|
self.ecx.ident_of("std"),
|
|
self.ecx.ident_of("fmt"),
|
|
self.ecx.ident_of("argumentuint")), vec!(arg))
|
|
}
|
|
};
|
|
|
|
let format_fn = self.ecx.path_global(sp, vec!(
|
|
self.ecx.ident_of("std"),
|
|
self.ecx.ident_of("fmt"),
|
|
self.ecx.ident_of(fmt_fn)));
|
|
self.ecx.expr_call_global(sp, vec!(
|
|
self.ecx.ident_of("std"),
|
|
self.ecx.ident_of("fmt"),
|
|
self.ecx.ident_of("argument")), vec!(self.ecx.expr_path(format_fn), arg))
|
|
}
|
|
}
|
|
|
|
pub fn expand_args(ecx: &mut ExtCtxt, sp: Span,
|
|
tts: &[ast::TokenTree]) -> base::MacResult {
|
|
|
|
match parse_args(ecx, sp, tts) {
|
|
(extra, Some((efmt, args, order, names))) => {
|
|
MRExpr(expand_preparsed_format_args(ecx, sp, extra, efmt, args,
|
|
order, names))
|
|
}
|
|
(_, None) => MRExpr(ecx.expr_uint(sp, 2))
|
|
}
|
|
}
|
|
|
|
/// Take the various parts of `format_args!(extra, efmt, args...,
|
|
/// name=names...)` and construct the appropriate formatting
|
|
/// expression.
|
|
pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt, sp: Span,
|
|
extra: @ast::Expr,
|
|
efmt: @ast::Expr, args: Vec<@ast::Expr>,
|
|
name_ordering: Vec<~str>,
|
|
names: HashMap<~str, @ast::Expr>) -> @ast::Expr {
|
|
let arg_types = Vec::from_fn(args.len(), |_| None);
|
|
let mut cx = Context {
|
|
ecx: ecx,
|
|
args: args,
|
|
arg_types: arg_types,
|
|
names: names,
|
|
name_positions: HashMap::new(),
|
|
name_types: HashMap::new(),
|
|
name_ordering: name_ordering,
|
|
nest_level: 0,
|
|
next_arg: 0,
|
|
pieces: Vec::new(),
|
|
method_statics: Vec::new(),
|
|
fmtsp: sp,
|
|
};
|
|
cx.fmtsp = efmt.span;
|
|
let fmt = match expr_to_str(cx.ecx,
|
|
efmt,
|
|
"format argument must be a string literal.") {
|
|
Some((fmt, _)) => fmt,
|
|
None => return MacResult::raw_dummy_expr(sp)
|
|
};
|
|
|
|
let mut parser = parse::Parser::new(fmt.get());
|
|
loop {
|
|
match parser.next() {
|
|
Some(piece) => {
|
|
if parser.errors.len() > 0 { break }
|
|
cx.verify_piece(&piece);
|
|
let piece = cx.trans_piece(&piece);
|
|
cx.pieces.push(piece);
|
|
}
|
|
None => break
|
|
}
|
|
}
|
|
match parser.errors.shift() {
|
|
Some(error) => {
|
|
cx.ecx.span_err(efmt.span, "invalid format string: " + error);
|
|
return MacResult::raw_dummy_expr(sp);
|
|
}
|
|
None => {}
|
|
}
|
|
|
|
// Make sure that all arguments were used and all arguments have types.
|
|
for (i, ty) in cx.arg_types.iter().enumerate() {
|
|
if ty.is_none() {
|
|
cx.ecx.span_err(cx.args.get(i).span, "argument never used");
|
|
}
|
|
}
|
|
for (name, e) in cx.names.iter() {
|
|
if !cx.name_types.contains_key(name) {
|
|
cx.ecx.span_err(e.span, "named argument never used");
|
|
}
|
|
}
|
|
|
|
cx.to_expr(extra)
|
|
}
|