| // Copyright 2012 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| use self::ArgumentType::*; |
| use self::Position::*; |
| |
| use fmt_macros as parse; |
| |
| use syntax::ast; |
| use syntax::codemap::{Span, respan}; |
| use syntax::ext::base::*; |
| use syntax::ext::base; |
| use syntax::ext::build::AstBuilder; |
| use syntax::fold::Folder; |
| use syntax::parse::token::special_idents; |
| use syntax::parse::token; |
| use syntax::ptr::P; |
| |
| use std::collections::HashMap; |
| |
| #[derive(PartialEq)] |
| enum ArgumentType { |
| Known(String), |
| Unsigned |
| } |
| |
| enum Position { |
| Exact(usize), |
| Named(String), |
| } |
| |
| struct Context<'a, 'b:'a> { |
| ecx: &'a mut ExtCtxt<'b>, |
| /// The macro's call site. References to unstable formatting internals must |
| /// use this span to pass the stability checker. |
| macsp: Span, |
| /// The span of the format string literal. |
| fmtsp: Span, |
| |
| /// Parsed argument expressions and the types that we've found so far for |
| /// them. |
| args: Vec<P<ast::Expr>>, |
| arg_types: Vec<Option<ArgumentType>>, |
| /// Parsed named expressions and the types that we've found for them so far. |
| /// Note that we keep a side-array of the ordering of the named arguments |
| /// found to be sure that we can translate them in the same order that they |
| /// were declared in. |
| names: HashMap<String, P<ast::Expr>>, |
| name_types: HashMap<String, ArgumentType>, |
| name_ordering: Vec<String>, |
| |
| /// The latest consecutive literal strings, or empty if there weren't any. |
| literal: String, |
| |
| /// Collection of the compiled `rt::Argument` structures |
| pieces: Vec<P<ast::Expr>>, |
| /// Collection of string literals |
| str_pieces: Vec<P<ast::Expr>>, |
| /// Stays `true` if all formatting parameters are default (as in "{}{}"). |
| all_pieces_simple: bool, |
| |
| name_positions: HashMap<String, usize>, |
| |
| /// Updated as arguments are consumed or methods are entered |
| nest_level: usize, |
| next_arg: usize, |
| } |
| |
| /// Parses the arguments from the given list of tokens, returning None |
| /// if there's a parse error so we can continue parsing other format! |
| /// expressions. |
| /// |
| /// If parsing succeeds, the return value is: |
| /// ```ignore |
| /// Some((fmtstr, unnamed arguments, ordering of named arguments, |
| /// named arguments)) |
| /// ``` |
| fn parse_args(ecx: &mut ExtCtxt, sp: Span, tts: &[ast::TokenTree]) |
| -> Option<(P<ast::Expr>, Vec<P<ast::Expr>>, Vec<String>, |
| HashMap<String, P<ast::Expr>>)> { |
| let mut args = Vec::new(); |
| let mut names = HashMap::<String, P<ast::Expr>>::new(); |
| let mut order = Vec::new(); |
| |
| let mut p = ecx.new_parser_from_tts(tts); |
| |
| if p.token == token::Eof { |
| ecx.span_err(sp, "requires at least a format string argument"); |
| return None; |
| } |
| let fmtstr = panictry!(p.parse_expr()); |
| let mut named = false; |
| while p.token != token::Eof { |
| if !p.eat(&token::Comma) { |
| ecx.span_err(sp, "expected token: `,`"); |
| return None; |
| } |
| if p.token == token::Eof { break } // accept trailing commas |
| if named || (p.token.is_ident() && p.look_ahead(1, |t| *t == token::Eq)) { |
| named = true; |
| let ident = match p.token { |
| token::Ident(i, _) => { |
| p.bump(); |
| i |
| } |
| _ if named => { |
| ecx.span_err(p.span, |
| "expected ident, positional arguments \ |
| cannot follow named arguments"); |
| return None; |
| } |
| _ => { |
| ecx.span_err(p.span, |
| &format!("expected ident for named argument, found `{}`", |
| p.this_token_to_string())); |
| return None; |
| } |
| }; |
| let name: &str = &ident.name.as_str(); |
| |
| panictry!(p.expect(&token::Eq)); |
| let e = panictry!(p.parse_expr()); |
| match names.get(name) { |
| None => {} |
| Some(prev) => { |
| ecx.struct_span_err(e.span, |
| &format!("duplicate argument named `{}`", |
| name)) |
| .span_note(prev.span, "previously here") |
| .emit(); |
| continue |
| } |
| } |
| order.push(name.to_string()); |
| names.insert(name.to_string(), e); |
| } else { |
| args.push(panictry!(p.parse_expr())); |
| } |
| } |
| Some((fmtstr, args, order, names)) |
| } |
| |
| impl<'a, 'b> Context<'a, 'b> { |
| /// Verifies one piece of a parse string. All errors are not emitted as |
| /// fatal so we can continue giving errors about this and possibly other |
| /// format strings. |
| fn verify_piece(&mut self, p: &parse::Piece) { |
| match *p { |
| parse::String(..) => {} |
| parse::NextArgument(ref arg) => { |
| // width/precision first, if they have implicit positional |
| // parameters it makes more sense to consume them first. |
| self.verify_count(arg.format.width); |
| self.verify_count(arg.format.precision); |
| |
| // argument second, if it's an implicit positional parameter |
| // it's written second, so it should come after width/precision. |
| let pos = match arg.position { |
| parse::ArgumentNext => { |
| let i = self.next_arg; |
| if self.check_positional_ok() { |
| self.next_arg += 1; |
| } |
| Exact(i) |
| } |
| parse::ArgumentIs(i) => Exact(i), |
| parse::ArgumentNamed(s) => Named(s.to_string()), |
| }; |
| |
| let ty = Known(arg.format.ty.to_string()); |
| self.verify_arg_type(pos, ty); |
| } |
| } |
| } |
| |
| fn verify_count(&mut self, c: parse::Count) { |
| match c { |
| parse::CountImplied | parse::CountIs(..) => {} |
| parse::CountIsParam(i) => { |
| self.verify_arg_type(Exact(i), Unsigned); |
| } |
| parse::CountIsName(s) => { |
| self.verify_arg_type(Named(s.to_string()), Unsigned); |
| } |
| parse::CountIsNextParam => { |
| if self.check_positional_ok() { |
| let next_arg = self.next_arg; |
| self.verify_arg_type(Exact(next_arg), Unsigned); |
| self.next_arg += 1; |
| } |
| } |
| } |
| } |
| |
| fn check_positional_ok(&mut self) -> bool { |
| if self.nest_level != 0 { |
| self.ecx.span_err(self.fmtsp, "cannot use implicit positional \ |
| arguments nested inside methods"); |
| false |
| } else { |
| true |
| } |
| } |
| |
| fn describe_num_args(&self) -> String { |
| match self.args.len() { |
| 0 => "no arguments given".to_string(), |
| 1 => "there is 1 argument".to_string(), |
| x => format!("there are {} arguments", x), |
| } |
| } |
| |
| fn verify_arg_type(&mut self, arg: Position, ty: ArgumentType) { |
| match arg { |
| Exact(arg) => { |
| if self.args.len() <= arg { |
| let msg = format!("invalid reference to argument `{}` ({})", |
| arg, self.describe_num_args()); |
| |
| self.ecx.span_err(self.fmtsp, &msg[..]); |
| return; |
| } |
| { |
| let arg_type = match self.arg_types[arg] { |
| None => None, |
| Some(ref x) => Some(x) |
| }; |
| self.verify_same(self.args[arg].span, &ty, arg_type); |
| } |
| if self.arg_types[arg].is_none() { |
| self.arg_types[arg] = Some(ty); |
| } |
| } |
| |
| Named(name) => { |
| let span = match self.names.get(&name) { |
| Some(e) => e.span, |
| None => { |
| let msg = format!("there is no argument named `{}`", name); |
| self.ecx.span_err(self.fmtsp, &msg[..]); |
| return; |
| } |
| }; |
| self.verify_same(span, &ty, self.name_types.get(&name)); |
| if !self.name_types.contains_key(&name) { |
| self.name_types.insert(name.clone(), ty); |
| } |
| // Assign this named argument a slot in the arguments array if |
| // it hasn't already been assigned a slot. |
| if !self.name_positions.contains_key(&name) { |
| let slot = self.name_positions.len(); |
| self.name_positions.insert(name, slot); |
| } |
| } |
| } |
| } |
| |
| /// When we're keeping track of the types that are declared for certain |
| /// arguments, we assume that `None` means we haven't seen this argument |
| /// yet, `Some(None)` means that we've seen the argument, but no format was |
| /// specified, and `Some(Some(x))` means that the argument was declared to |
| /// have type `x`. |
| /// |
| /// Obviously `Some(Some(x)) != Some(Some(y))`, but we consider it true |
| /// that: `Some(None) == Some(Some(x))` |
| fn verify_same(&self, |
| sp: Span, |
| ty: &ArgumentType, |
| before: Option<&ArgumentType>) { |
| let cur = match before { |
| None => return, |
| Some(t) => t, |
| }; |
| if *ty == *cur { |
| return |
| } |
| match (cur, ty) { |
| (&Known(ref cur), &Known(ref ty)) => { |
| self.ecx.span_err(sp, |
| &format!("argument redeclared with type `{}` when \ |
| it was previously `{}`", |
| *ty, |
| *cur)); |
| } |
| (&Known(ref cur), _) => { |
| self.ecx.span_err(sp, |
| &format!("argument used to format with `{}` was \ |
| attempted to not be used for formatting", |
| *cur)); |
| } |
| (_, &Known(ref ty)) => { |
| self.ecx.span_err(sp, |
| &format!("argument previously used as a format \ |
| argument attempted to be used as `{}`", |
| *ty)); |
| } |
| (_, _) => { |
| self.ecx.span_err(sp, "argument declared with multiple formats"); |
| } |
| } |
| } |
| |
| fn rtpath(ecx: &ExtCtxt, s: &str) -> Vec<ast::Ident> { |
| ecx.std_path(&["fmt", "rt", "v1", s]) |
| } |
| |
| fn trans_count(&self, c: parse::Count) -> P<ast::Expr> { |
| let sp = self.macsp; |
| let count = |c, arg| { |
| let mut path = Context::rtpath(self.ecx, "Count"); |
| path.push(self.ecx.ident_of(c)); |
| match arg { |
| Some(arg) => self.ecx.expr_call_global(sp, path, vec![arg]), |
| None => self.ecx.expr_path(self.ecx.path_global(sp, path)), |
| } |
| }; |
| match c { |
| parse::CountIs(i) => count("Is", Some(self.ecx.expr_usize(sp, i))), |
| parse::CountIsParam(i) => { |
| count("Param", Some(self.ecx.expr_usize(sp, i))) |
| } |
| parse::CountImplied => count("Implied", None), |
| parse::CountIsNextParam => count("NextParam", None), |
| parse::CountIsName(n) => { |
| let i = match self.name_positions.get(n) { |
| Some(&i) => i, |
| None => 0, // error already emitted elsewhere |
| }; |
| let i = i + self.args.len(); |
| count("Param", Some(self.ecx.expr_usize(sp, i))) |
| } |
| } |
| } |
| |
| /// Translate the accumulated string literals to a literal expression |
| fn trans_literal_string(&mut self) -> P<ast::Expr> { |
| let sp = self.fmtsp; |
| let s = token::intern_and_get_ident(&self.literal); |
| self.literal.clear(); |
| self.ecx.expr_str(sp, s) |
| } |
| |
| /// Translate a `parse::Piece` to a static `rt::Argument` or append |
| /// to the `literal` string. |
| fn trans_piece(&mut self, piece: &parse::Piece) -> Option<P<ast::Expr>> { |
| let sp = self.macsp; |
| match *piece { |
| parse::String(s) => { |
| self.literal.push_str(s); |
| None |
| } |
| parse::NextArgument(ref arg) => { |
| // Translate the position |
| let pos = { |
| let pos = |c, arg| { |
| let mut path = Context::rtpath(self.ecx, "Position"); |
| path.push(self.ecx.ident_of(c)); |
| match arg { |
| Some(i) => { |
| let arg = self.ecx.expr_usize(sp, i); |
| self.ecx.expr_call_global(sp, path, vec![arg]) |
| } |
| None => { |
| self.ecx.expr_path(self.ecx.path_global(sp, path)) |
| } |
| } |
| }; |
| match arg.position { |
| // These two have a direct mapping |
| parse::ArgumentNext => pos("Next", None), |
| parse::ArgumentIs(i) => pos("At", Some(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.get(n) { |
| Some(&i) => i, |
| None => 0, // error already emitted elsewhere |
| }; |
| let i = i + self.args.len(); |
| pos("At", Some(i)) |
| } |
| } |
| }; |
| |
| let simple_arg = parse::Argument { |
| position: parse::ArgumentNext, |
| format: parse::FormatSpec { |
| fill: arg.format.fill, |
| align: parse::AlignUnknown, |
| flags: 0, |
| precision: parse::CountImplied, |
| width: parse::CountImplied, |
| ty: arg.format.ty |
| } |
| }; |
| |
| let fill = match arg.format.fill { Some(c) => c, None => ' ' }; |
| |
| if *arg != simple_arg || fill != ' ' { |
| self.all_pieces_simple = false; |
| } |
| |
| // Translate the format |
| let fill = self.ecx.expr_lit(sp, ast::LitChar(fill)); |
| let align = |name| { |
| let mut p = Context::rtpath(self.ecx, "Alignment"); |
| p.push(self.ecx.ident_of(name)); |
| self.ecx.path_global(sp, p) |
| }; |
| let align = match arg.format.align { |
| parse::AlignLeft => align("Left"), |
| parse::AlignRight => align("Right"), |
| parse::AlignCenter => align("Center"), |
| parse::AlignUnknown => align("Unknown"), |
| }; |
| let align = self.ecx.expr_path(align); |
| let flags = self.ecx.expr_u32(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, Context::rtpath(self.ecx, "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))); |
| |
| let path = self.ecx.path_global(sp, Context::rtpath(self.ecx, "Argument")); |
| Some(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)))) |
| } |
| } |
| } |
| |
| fn static_array(ecx: &mut ExtCtxt, |
| name: &str, |
| piece_ty: P<ast::Ty>, |
| pieces: Vec<P<ast::Expr>>) |
| -> P<ast::Expr> { |
| let sp = piece_ty.span; |
| let ty = ecx.ty_rptr(sp, |
| ecx.ty(sp, ast::TyVec(piece_ty)), |
| Some(ecx.lifetime(sp, special_idents::static_lifetime.name)), |
| ast::MutImmutable); |
| let slice = ecx.expr_vec_slice(sp, pieces); |
| // static instead of const to speed up codegen by not requiring this to be inlined |
| let st = ast::ItemStatic(ty, ast::MutImmutable, slice); |
| |
| let name = ecx.ident_of(name); |
| let item = ecx.item(sp, name, vec![], st); |
| let decl = respan(sp, ast::DeclItem(item)); |
| |
| // Wrap the declaration in a block so that it forms a single expression. |
| ecx.expr_block(ecx.block(sp, |
| vec![P(respan(sp, ast::StmtDecl(P(decl), ast::DUMMY_NODE_ID)))], |
| Some(ecx.expr_ident(sp, name)))) |
| } |
| |
| /// Actually builds the expression which the iformat! block will be expanded |
| /// to |
| fn into_expr(mut self) -> P<ast::Expr> { |
| let mut locals = Vec::new(); |
| let mut names = vec![None; self.name_positions.len()]; |
| let mut pats = Vec::new(); |
| let mut heads = Vec::new(); |
| |
| // First, build up the static array which will become our precompiled |
| // format "string" |
| let static_lifetime = self.ecx.lifetime(self.fmtsp, special_idents::static_lifetime.name); |
| let piece_ty = self.ecx.ty_rptr( |
| self.fmtsp, |
| self.ecx.ty_ident(self.fmtsp, self.ecx.ident_of("str")), |
| Some(static_lifetime), |
| ast::MutImmutable); |
| let pieces = Context::static_array(self.ecx, |
| "__STATIC_FMTSTR", |
| piece_ty, |
| self.str_pieces); |
| |
| |
| // 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 |
| // valid 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.into_iter().enumerate() { |
| let arg_ty = match self.arg_types[i].as_ref() { |
| Some(ty) => ty, |
| None => continue // error already generated |
| }; |
| |
| let name = self.ecx.ident_of(&format!("__arg{}", i)); |
| pats.push(self.ecx.pat_ident(e.span, name)); |
| locals.push(Context::format_arg(self.ecx, self.macsp, e.span, arg_ty, |
| self.ecx.expr_ident(e.span, name))); |
| heads.push(self.ecx.expr_addr_of(e.span, e)); |
| } |
| for name in &self.name_ordering { |
| let e = match self.names.remove(name) { |
| Some(e) => e, |
| None => continue |
| }; |
| let arg_ty = match self.name_types.get(name) { |
| Some(ty) => ty, |
| None => continue |
| }; |
| |
| let lname = self.ecx.ident_of(&format!("__arg{}", |
| *name)); |
| pats.push(self.ecx.pat_ident(e.span, lname)); |
| names[*self.name_positions.get(name).unwrap()] = |
| Some(Context::format_arg(self.ecx, self.macsp, e.span, arg_ty, |
| self.ecx.expr_ident(e.span, lname))); |
| heads.push(self.ecx.expr_addr_of(e.span, e)); |
| } |
| |
| // Now create a vector containing all the arguments |
| let args = locals.into_iter().chain(names.into_iter().map(|a| a.unwrap())); |
| |
| let args_array = self.ecx.expr_vec(self.fmtsp, args.collect()); |
| |
| // Constructs an AST equivalent to: |
| // |
| // match (&arg0, &arg1) { |
| // (tmp0, tmp1) => args_array |
| // } |
| // |
| // It was: |
| // |
| // let tmp0 = &arg0; |
| // let tmp1 = &arg1; |
| // args_array |
| // |
| // 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 args_array 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 => args_array } } } |
| // |
| // 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_tuple(self.fmtsp, pats); |
| let arm = self.ecx.arm(self.fmtsp, vec!(pat), args_array); |
| let head = self.ecx.expr(self.fmtsp, ast::ExprTup(heads)); |
| let result = self.ecx.expr_match(self.fmtsp, head, vec!(arm)); |
| |
| let args_slice = self.ecx.expr_addr_of(self.fmtsp, result); |
| |
| // Now create the fmt::Arguments struct with all our locals we created. |
| let (fn_name, fn_args) = if self.all_pieces_simple { |
| ("new_v1", vec![pieces, args_slice]) |
| } else { |
| // Build up the static array which will store our precompiled |
| // nonstandard placeholders, if there are any. |
| let piece_ty = self.ecx.ty_path(self.ecx.path_global( |
| self.macsp, |
| Context::rtpath(self.ecx, "Argument"))); |
| let fmt = Context::static_array(self.ecx, |
| "__STATIC_FMTARGS", |
| piece_ty, |
| self.pieces); |
| |
| ("new_v1_formatted", vec![pieces, args_slice, fmt]) |
| }; |
| |
| let path = self.ecx.std_path(&["fmt", "Arguments", fn_name]); |
| self.ecx.expr_call_global(self.macsp, path, fn_args) |
| } |
| |
| fn format_arg(ecx: &ExtCtxt, macsp: Span, sp: Span, |
| ty: &ArgumentType, arg: P<ast::Expr>) |
| -> P<ast::Expr> { |
| let trait_ = match *ty { |
| Known(ref tyname) => { |
| match &tyname[..] { |
| "" => "Display", |
| "?" => "Debug", |
| "e" => "LowerExp", |
| "E" => "UpperExp", |
| "o" => "Octal", |
| "p" => "Pointer", |
| "b" => "Binary", |
| "x" => "LowerHex", |
| "X" => "UpperHex", |
| _ => { |
| ecx.span_err(sp, |
| &format!("unknown format trait `{}`", |
| *tyname)); |
| "Dummy" |
| } |
| } |
| } |
| Unsigned => { |
| let path = ecx.std_path(&["fmt", "ArgumentV1", "from_usize"]); |
| return ecx.expr_call_global(macsp, path, vec![arg]) |
| } |
| }; |
| |
| let path = ecx.std_path(&["fmt", trait_, "fmt"]); |
| let format_fn = ecx.path_global(sp, path); |
| let path = ecx.std_path(&["fmt", "ArgumentV1", "new"]); |
| ecx.expr_call_global(macsp, path, vec![arg, ecx.expr_path(format_fn)]) |
| } |
| } |
| |
| pub fn expand_format_args<'cx>(ecx: &'cx mut ExtCtxt, sp: Span, |
| tts: &[ast::TokenTree]) |
| -> Box<base::MacResult+'cx> { |
| |
| match parse_args(ecx, sp, tts) { |
| Some((efmt, args, order, names)) => { |
| MacEager::expr(expand_preparsed_format_args(ecx, sp, efmt, |
| args, order, names)) |
| } |
| None => DummyResult::expr(sp) |
| } |
| } |
| |
| /// Take the various parts of `format_args!(efmt, args..., name=names...)` |
| /// and construct the appropriate formatting expression. |
| pub fn expand_preparsed_format_args(ecx: &mut ExtCtxt, sp: Span, |
| efmt: P<ast::Expr>, |
| args: Vec<P<ast::Expr>>, |
| name_ordering: Vec<String>, |
| names: HashMap<String, P<ast::Expr>>) |
| -> P<ast::Expr> { |
| let arg_types: Vec<_> = (0..args.len()).map(|_| None).collect(); |
| let macsp = ecx.call_site(); |
| // Expand the format literal so that efmt.span will have a backtrace. This |
| // is essential for locating a bug when the format literal is generated in |
| // a macro. (e.g. println!("{}"), which uses concat!($fmt, "\n")). |
| let efmt = ecx.expander().fold_expr(efmt); |
| 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, |
| literal: String::new(), |
| pieces: Vec::new(), |
| str_pieces: Vec::new(), |
| all_pieces_simple: true, |
| macsp: macsp, |
| fmtsp: efmt.span, |
| }; |
| let fmt = match expr_to_string(cx.ecx, |
| efmt, |
| "format argument must be a string literal.") { |
| Some((fmt, _)) => fmt, |
| None => return DummyResult::raw_expr(sp) |
| }; |
| |
| let mut parser = parse::Parser::new(&fmt); |
| |
| loop { |
| match parser.next() { |
| Some(piece) => { |
| if !parser.errors.is_empty() { break } |
| cx.verify_piece(&piece); |
| match cx.trans_piece(&piece) { |
| Some(piece) => { |
| let s = cx.trans_literal_string(); |
| cx.str_pieces.push(s); |
| cx.pieces.push(piece); |
| } |
| None => {} |
| } |
| } |
| None => break |
| } |
| } |
| if !parser.errors.is_empty() { |
| cx.ecx.span_err(cx.fmtsp, &format!("invalid format string: {}", |
| parser.errors.remove(0))); |
| return DummyResult::raw_expr(sp); |
| } |
| if !cx.literal.is_empty() { |
| let s = cx.trans_literal_string(); |
| cx.str_pieces.push(s); |
| } |
| |
| // 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[i].span, "argument never used"); |
| } |
| } |
| for (name, e) in &cx.names { |
| if !cx.name_types.contains_key(name) { |
| cx.ecx.span_err(e.span, "named argument never used"); |
| } |
| } |
| |
| cx.into_expr() |
| } |
