2012-12-03 18:48:01 -06:00
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// 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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2011-08-27 23:27:39 -05:00
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/*
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2012-10-12 14:32:36 -05:00
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* The compiler code necessary to support the fmt! extension. Eventually this
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2011-08-27 23:27:39 -05:00
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* should all get sucked into either the standard library extfmt module or the
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* compiler syntax extension plugin interface.
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*/
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2012-12-23 16:41:37 -06:00
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2013-01-08 21:37:25 -06:00
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use core::prelude::*;
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2012-12-23 16:41:37 -06:00
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use ast;
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use codemap::span;
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use ext::base::*;
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use ext::base;
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use ext::build::*;
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2012-12-23 16:41:37 -06:00
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use extfmt::ct::*;
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2013-01-29 16:41:40 -06:00
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pub fn expand_syntax_ext(cx: ext_ctxt, sp: span, tts: ~[ast::token_tree])
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-> base::MacResult {
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let args = get_exprs_from_tts(cx, copy tts);
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if args.len() == 0 {
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cx.span_fatal(sp, "fmt! takes at least 1 argument.");
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}
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let fmt =
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expr_to_str(cx, args[0],
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~"first argument to fmt! must be a string literal.");
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let fmtspan = args[0].span;
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debug!("Format string:");
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2011-12-22 19:53:53 -06:00
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log(debug, fmt);
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fn parse_fmt_err_(cx: ext_ctxt, sp: span, msg: &str) -> ! {
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cx.span_fatal(sp, msg);
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}
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let parse_fmt_err = fn@(s: &str) -> ! {
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parse_fmt_err_(cx, fmtspan, s)
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};
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let pieces = parse_fmt_string(fmt, parse_fmt_err);
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MRExpr(pieces_to_expr(cx, sp, pieces, args))
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}
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2012-06-21 18:44:10 -05:00
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// FIXME (#2249): A lot of these functions for producing expressions can
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// probably be factored out in common with other code that builds
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// expressions. Also: Cleanup the naming of these functions.
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2012-01-25 15:47:56 -06:00
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// NOTE: Moved many of the common ones to build.rs --kevina
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fn pieces_to_expr(cx: ext_ctxt, sp: span,
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pieces: ~[Piece], args: ~[@ast::expr])
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-> @ast::expr {
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fn make_path_vec(cx: ext_ctxt, ident: @~str) -> ~[ast::ident] {
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let intr = cx.parse_sess().interner;
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return ~[intr.intern(@~"extfmt"), intr.intern(@~"rt"),
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intr.intern(ident)];
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}
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fn make_rt_path_expr(cx: ext_ctxt, sp: span, nm: @~str) -> @ast::expr {
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let path = make_path_vec(cx, nm);
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return mk_path_global(cx, sp, path);
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}
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// Produces an AST expression that represents a RT::conv record,
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// which tells the RT::conv* functions how to perform the conversion
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fn make_rt_conv_expr(cx: ext_ctxt, sp: span, cnv: Conv) -> @ast::expr {
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fn make_flags(cx: ext_ctxt, sp: span, flags: ~[Flag]) -> @ast::expr {
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let mut tmp_expr = make_rt_path_expr(cx, sp, @~"flag_none");
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for flags.each |f| {
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let fstr = match *f {
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FlagLeftJustify => ~"flag_left_justify",
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FlagLeftZeroPad => ~"flag_left_zero_pad",
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FlagSpaceForSign => ~"flag_space_for_sign",
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FlagSignAlways => ~"flag_sign_always",
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FlagAlternate => ~"flag_alternate"
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};
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tmp_expr = mk_binary(cx, sp, ast::bitor, tmp_expr,
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make_rt_path_expr(cx, sp, @fstr));
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}
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return tmp_expr;
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}
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fn make_count(cx: ext_ctxt, sp: span, cnt: Count) -> @ast::expr {
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match cnt {
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CountImplied => {
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return make_rt_path_expr(cx, sp, @~"CountImplied");
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}
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CountIs(c) => {
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let count_lit = mk_uint(cx, sp, c as uint);
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let count_is_path = make_path_vec(cx, @~"CountIs");
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let count_is_args = ~[count_lit];
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return mk_call_global(cx, sp, count_is_path, count_is_args);
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}
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_ => cx.span_unimpl(sp, ~"unimplemented fmt! conversion")
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}
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}
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fn make_ty(cx: ext_ctxt, sp: span, t: Ty) -> @ast::expr {
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let mut rt_type;
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match t {
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TyHex(c) => match c {
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CaseUpper => rt_type = ~"TyHexUpper",
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CaseLower => rt_type = ~"TyHexLower"
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},
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TyBits => rt_type = ~"TyBits",
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TyOctal => rt_type = ~"TyOctal",
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_ => rt_type = ~"TyDefault"
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}
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return make_rt_path_expr(cx, sp, @rt_type);
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}
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fn make_conv_struct(cx: ext_ctxt, sp: span, flags_expr: @ast::expr,
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width_expr: @ast::expr, precision_expr: @ast::expr,
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ty_expr: @ast::expr) -> @ast::expr {
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let intr = cx.parse_sess().interner;
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mk_global_struct_e(
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cx,
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sp,
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make_path_vec(cx, @~"Conv"),
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~[
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{ident: intr.intern(@~"flags"), ex: flags_expr},
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{ident: intr.intern(@~"width"), ex: width_expr},
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{ident: intr.intern(@~"precision"), ex: precision_expr},
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{ident: intr.intern(@~"ty"), ex: ty_expr},
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]
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)
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}
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let rt_conv_flags = make_flags(cx, sp, cnv.flags);
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let rt_conv_width = make_count(cx, sp, cnv.width);
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let rt_conv_precision = make_count(cx, sp, cnv.precision);
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let rt_conv_ty = make_ty(cx, sp, cnv.ty);
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make_conv_struct(cx, sp, rt_conv_flags, rt_conv_width,
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rt_conv_precision, rt_conv_ty)
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}
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fn make_conv_call(cx: ext_ctxt, sp: span, conv_type: ~str, cnv: Conv,
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arg: @ast::expr) -> @ast::expr {
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let fname = ~"conv_" + conv_type;
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let path = make_path_vec(cx, @fname);
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let cnv_expr = make_rt_conv_expr(cx, sp, cnv);
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let args = ~[cnv_expr, arg];
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return mk_call_global(cx, arg.span, path, args);
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}
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fn make_new_conv(cx: ext_ctxt, sp: span, cnv: Conv, arg: @ast::expr) ->
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@ast::expr {
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// FIXME: Move validation code into core::extfmt (Issue #2249)
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fn is_signed_type(cnv: Conv) -> bool {
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match cnv.ty {
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TyInt(s) => match s {
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Signed => return true,
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Unsigned => return false
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},
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TyFloat => return true,
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_ => return false
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}
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}
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let unsupported = ~"conversion not supported in fmt! string";
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match cnv.param {
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option::None => (),
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_ => cx.span_unimpl(sp, unsupported)
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}
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for cnv.flags.each |f| {
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match *f {
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FlagLeftJustify => (),
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FlagSignAlways => {
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if !is_signed_type(cnv) {
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cx.span_fatal(sp,
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~"+ flag only valid in " +
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~"signed fmt! conversion");
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}
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}
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FlagSpaceForSign => {
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if !is_signed_type(cnv) {
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cx.span_fatal(sp,
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~"space flag only valid in " +
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~"signed fmt! conversions");
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}
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}
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FlagLeftZeroPad => (),
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_ => cx.span_unimpl(sp, unsupported)
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}
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}
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match cnv.width {
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CountImplied => (),
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CountIs(_) => (),
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_ => cx.span_unimpl(sp, unsupported)
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}
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match cnv.precision {
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CountImplied => (),
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CountIs(_) => (),
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_ => cx.span_unimpl(sp, unsupported)
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}
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match cnv.ty {
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TyStr => return make_conv_call(cx, arg.span, ~"str", cnv, arg),
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TyInt(sign) => match sign {
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Signed => return make_conv_call(cx, arg.span, ~"int", cnv, arg),
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Unsigned => {
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return make_conv_call(cx, arg.span, ~"uint", cnv, arg)
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}
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},
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TyBool => return make_conv_call(cx, arg.span, ~"bool", cnv, arg),
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TyChar => return make_conv_call(cx, arg.span, ~"char", cnv, arg),
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TyHex(_) => {
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return make_conv_call(cx, arg.span, ~"uint", cnv, arg);
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}
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TyBits => return make_conv_call(cx, arg.span, ~"uint", cnv, arg),
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TyOctal => return make_conv_call(cx, arg.span, ~"uint", cnv, arg),
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TyFloat => {
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return make_conv_call(cx, arg.span, ~"float", cnv, arg);
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}
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TyPoly => return make_conv_call(cx, arg.span, ~"poly", cnv,
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mk_addr_of(cx, sp, arg))
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}
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}
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fn log_conv(c: Conv) {
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match c.param {
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Some(p) => { log(debug, ~"param: " + p.to_str()); }
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_ => debug!("param: none")
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}
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2012-06-30 18:19:07 -05:00
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for c.flags.each |f| {
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match *f {
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FlagLeftJustify => debug!("flag: left justify"),
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FlagLeftZeroPad => debug!("flag: left zero pad"),
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FlagSpaceForSign => debug!("flag: left space pad"),
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FlagSignAlways => debug!("flag: sign always"),
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FlagAlternate => debug!("flag: alternate")
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}
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}
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match c.width {
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CountIs(i) => log(
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debug, ~"width: count is " + i.to_str()),
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CountIsParam(i) => log(
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debug, ~"width: count is param " + i.to_str()),
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CountIsNextParam => debug!("width: count is next param"),
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CountImplied => debug!("width: count is implied")
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}
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match c.precision {
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2012-09-11 21:37:29 -05:00
|
|
|
CountIs(i) => log(
|
2012-11-01 18:47:24 -05:00
|
|
|
debug, ~"prec: count is " + i.to_str()),
|
2012-09-11 21:37:29 -05:00
|
|
|
CountIsParam(i) => log(
|
2012-11-01 18:47:24 -05:00
|
|
|
debug, ~"prec: count is param " + i.to_str()),
|
2012-09-11 21:37:29 -05:00
|
|
|
CountIsNextParam => debug!("prec: count is next param"),
|
|
|
|
CountImplied => debug!("prec: count is implied")
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
2012-08-06 14:34:08 -05:00
|
|
|
match c.ty {
|
2012-09-11 21:37:29 -05:00
|
|
|
TyBool => debug!("type: bool"),
|
|
|
|
TyStr => debug!("type: str"),
|
|
|
|
TyChar => debug!("type: char"),
|
|
|
|
TyInt(s) => match s {
|
|
|
|
Signed => debug!("type: signed"),
|
|
|
|
Unsigned => debug!("type: unsigned")
|
2012-08-06 19:14:32 -05:00
|
|
|
},
|
2012-09-11 21:37:29 -05:00
|
|
|
TyBits => debug!("type: bits"),
|
|
|
|
TyHex(cs) => match cs {
|
|
|
|
CaseUpper => debug!("type: uhex"),
|
|
|
|
CaseLower => debug!("type: lhex"),
|
2012-08-06 19:14:32 -05:00
|
|
|
},
|
2012-09-11 21:37:29 -05:00
|
|
|
TyOctal => debug!("type: octal"),
|
|
|
|
TyFloat => debug!("type: float"),
|
|
|
|
TyPoly => debug!("type: poly")
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
let fmt_sp = args[0].span;
|
2012-03-15 08:47:03 -05:00
|
|
|
let mut n = 0u;
|
2012-06-29 18:26:56 -05:00
|
|
|
let mut piece_exprs = ~[];
|
2012-06-28 18:23:12 -05:00
|
|
|
let nargs = args.len();
|
2012-06-30 18:19:07 -05:00
|
|
|
for pieces.each |pc| {
|
2012-09-19 18:55:01 -05:00
|
|
|
match *pc {
|
2012-12-04 12:50:00 -06:00
|
|
|
PieceString(ref s) => {
|
|
|
|
piece_exprs.push(mk_uniq_str(cx, fmt_sp, (*s)))
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
2012-09-11 21:37:29 -05:00
|
|
|
PieceConv(conv) => {
|
2011-08-27 23:27:39 -05:00
|
|
|
n += 1u;
|
|
|
|
if n >= nargs {
|
|
|
|
cx.span_fatal(sp,
|
2012-10-12 14:32:36 -05:00
|
|
|
~"not enough arguments to fmt! " +
|
2012-07-14 00:57:48 -05:00
|
|
|
~"for the given format string");
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
2012-08-22 19:24:52 -05:00
|
|
|
debug!("Building conversion:");
|
2011-08-27 23:27:39 -05:00
|
|
|
log_conv(conv);
|
|
|
|
let arg_expr = args[n];
|
|
|
|
let c_expr = make_new_conv(cx, fmt_sp, conv, arg_expr);
|
2012-09-26 19:33:34 -05:00
|
|
|
piece_exprs.push(c_expr);
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
let expected_nargs = n + 1u; // n conversions + the fmt string
|
|
|
|
|
|
|
|
if expected_nargs < nargs {
|
2011-09-12 05:39:38 -05:00
|
|
|
cx.span_fatal
|
2012-10-12 14:32:36 -05:00
|
|
|
(sp, fmt!("too many arguments to fmt!. found %u, expected %u",
|
2012-08-22 19:24:52 -05:00
|
|
|
nargs, expected_nargs));
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
2012-06-28 18:23:12 -05:00
|
|
|
|
|
|
|
let arg_vec = mk_fixed_vec_e(cx, fmt_sp, piece_exprs);
|
2012-12-23 16:41:37 -06:00
|
|
|
return mk_call_global(cx,
|
|
|
|
fmt_sp,
|
|
|
|
~[cx.parse_sess().interner.intern(@~"str"),
|
|
|
|
cx.parse_sess().interner.intern(@~"concat")],
|
|
|
|
~[arg_vec]);
|
2011-08-27 23:27:39 -05:00
|
|
|
}
|
|
|
|
//
|
|
|
|
// Local Variables:
|
|
|
|
// mode: rust
|
|
|
|
// fill-column: 78;
|
|
|
|
// indent-tabs-mode: nil
|
|
|
|
// c-basic-offset: 4
|
|
|
|
// buffer-file-coding-system: utf-8-unix
|
|
|
|
// End:
|
|
|
|
//
|