287 lines
11 KiB
Rust
287 lines
11 KiB
Rust
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/*
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* The compiler code necessary to support the #fmt extension. Eventually this
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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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import extfmt::ct::*;
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import base::*;
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import codemap::span;
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import ext::build::*;
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export expand_syntax_ext;
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fn expand_syntax_ext(cx: ext_ctxt, sp: span, arg: ast::mac_arg,
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_body: ast::mac_body) -> @ast::expr {
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let args = get_mac_args_no_max(cx, sp, arg, 1u, "fmt");
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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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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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ret pieces_to_expr(cx, sp, pieces, args);
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}
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// FIXME: A lot of these functions for producing expressions can probably
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// be factored out in common with other code that builds expressions.
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// FIXME: Cleanup the naming of these functions
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// NOTE: Moved many of the common ones to build.rs --kevina
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// See Issue #2249
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fn pieces_to_expr(cx: ext_ctxt, sp: span, pieces: [piece], args: [@ast::expr])
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-> @ast::expr {
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fn make_path_vec(_cx: ext_ctxt, ident: ast::ident) -> [ast::ident] {
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ret [@"extfmt", @"rt", ident];
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}
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fn make_rt_path_expr(cx: ext_ctxt, sp: span,
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ident: ast::ident) -> @ast::expr {
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let path = make_path_vec(cx, ident);
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ret mk_path(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 flagexprs: [@ast::expr] = [];
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for flags.each {|f|
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let mut fstr;
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alt f {
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flag_left_justify { fstr = "flag_left_justify"; }
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flag_left_zero_pad { fstr = "flag_left_zero_pad"; }
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flag_space_for_sign { fstr = "flag_space_for_sign"; }
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flag_sign_always { fstr = "flag_sign_always"; }
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flag_alternate { fstr = "flag_alternate"; }
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}
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flagexprs += [make_rt_path_expr(cx, sp, @fstr)];
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}
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ret mk_vec_e(cx, sp, flagexprs);
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}
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fn make_count(cx: ext_ctxt, sp: span, cnt: count) -> @ast::expr {
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alt cnt {
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count_implied {
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ret make_rt_path_expr(cx, sp, @"count_implied");
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}
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count_is(c) {
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let count_lit = mk_int(cx, sp, c);
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let count_is_path = make_path_vec(cx, @"count_is");
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let count_is_args = [count_lit];
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ret mk_call(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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alt t {
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ty_hex(c) {
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alt c {
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case_upper { rt_type = "ty_hex_upper"; }
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case_lower { rt_type = "ty_hex_lower"; }
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}
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}
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ty_bits { rt_type = "ty_bits"; }
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ty_octal { rt_type = "ty_octal"; }
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_ { rt_type = "ty_default"; }
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}
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ret make_rt_path_expr(cx, sp, @rt_type);
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}
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fn make_conv_rec(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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ret mk_rec_e(cx, sp,
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[{ident: @"flags", ex: flags_expr},
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{ident: @"width", ex: width_expr},
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{ident: @"precision", ex: precision_expr},
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{ident: @"ty", ex: ty_expr}]);
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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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ret make_conv_rec(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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ret mk_call(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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alt cnv.ty {
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ty_int(s) {
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alt s { signed { ret true; } unsigned { ret false; } }
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}
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ty_float { ret true; }
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_ { ret 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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alt 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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alt f {
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flag_left_justify { }
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flag_sign_always {
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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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flag_space_for_sign {
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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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flag_left_zero_pad { }
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_ { cx.span_unimpl(sp, unsupported); }
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}
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}
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alt cnv.width {
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count_implied { }
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count_is(_) { }
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_ { cx.span_unimpl(sp, unsupported); }
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}
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alt cnv.precision {
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count_implied { }
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count_is(_) { }
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_ { cx.span_unimpl(sp, unsupported); }
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}
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alt cnv.ty {
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ty_str { ret make_conv_call(cx, arg.span, "str", cnv, arg); }
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ty_int(sign) {
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alt sign {
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signed { ret make_conv_call(cx, arg.span, "int", cnv, arg); }
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unsigned {
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ret make_conv_call(cx, arg.span, "uint", cnv, arg);
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}
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}
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}
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ty_bool { ret make_conv_call(cx, arg.span, "bool", cnv, arg); }
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ty_char { ret make_conv_call(cx, arg.span, "char", cnv, arg); }
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ty_hex(_) { ret make_conv_call(cx, arg.span, "uint", cnv, arg); }
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ty_bits { ret make_conv_call(cx, arg.span, "uint", cnv, arg); }
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ty_octal { ret make_conv_call(cx, arg.span, "uint", cnv, arg); }
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ty_float { ret make_conv_call(cx, arg.span, "float", cnv, arg); }
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ty_poly { ret make_conv_call(cx, arg.span, "poly", cnv, arg); }
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}
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}
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fn log_conv(c: conv) {
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alt c.param {
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some(p) { log(debug, "param: " + int::to_str(p, 10u)); }
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_ { #debug("param: none"); }
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}
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for c.flags.each {|f|
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alt f {
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flag_left_justify { #debug("flag: left justify"); }
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flag_left_zero_pad { #debug("flag: left zero pad"); }
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flag_space_for_sign { #debug("flag: left space pad"); }
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flag_sign_always { #debug("flag: sign always"); }
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flag_alternate { #debug("flag: alternate"); }
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}
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}
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alt c.width {
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count_is(i) { log(debug,
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"width: count is " + int::to_str(i, 10u)); }
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count_is_param(i) {
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log(debug,
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"width: count is param " + int::to_str(i, 10u));
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}
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count_is_next_param { #debug("width: count is next param"); }
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count_implied { #debug("width: count is implied"); }
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}
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alt c.precision {
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count_is(i) { log(debug,
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"prec: count is " + int::to_str(i, 10u)); }
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count_is_param(i) {
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log(debug,
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"prec: count is param " + int::to_str(i, 10u));
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}
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count_is_next_param { #debug("prec: count is next param"); }
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count_implied { #debug("prec: count is implied"); }
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}
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alt c.ty {
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ty_bool { #debug("type: bool"); }
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ty_str { #debug("type: str"); }
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ty_char { #debug("type: char"); }
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ty_int(s) {
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alt s {
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signed { #debug("type: signed"); }
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unsigned { #debug("type: unsigned"); }
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}
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}
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ty_bits { #debug("type: bits"); }
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ty_hex(cs) {
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alt cs {
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case_upper { #debug("type: uhex"); }
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case_lower { #debug("type: lhex"); }
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}
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}
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ty_octal { #debug("type: octal"); }
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ty_float { #debug("type: float"); }
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ty_poly { #debug("type: poly"); }
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}
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}
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let fmt_sp = args[0].span;
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let mut n = 0u;
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let mut tmp_expr = mk_str(cx, sp, "");
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let nargs = vec::len::<@ast::expr>(args);
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for pieces.each {|pc|
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alt pc {
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piece_string(s) {
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let s_expr = mk_str(cx, fmt_sp, s);
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tmp_expr = mk_binary(cx, fmt_sp, ast::add, tmp_expr, s_expr);
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}
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piece_conv(conv) {
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n += 1u;
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if n >= nargs {
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cx.span_fatal(sp,
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"not enough arguments to #fmt " +
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"for the given format string");
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}
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#debug("Building conversion:");
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log_conv(conv);
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let arg_expr = args[n];
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let c_expr = make_new_conv(cx, fmt_sp, conv, arg_expr);
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tmp_expr = mk_binary(cx, fmt_sp, ast::add, tmp_expr, c_expr);
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}
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}
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}
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let expected_nargs = n + 1u; // n conversions + the fmt string
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if expected_nargs < nargs {
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cx.span_fatal
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(sp, #fmt["too many arguments to #fmt. found %u, expected %u",
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nargs, expected_nargs]);
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}
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ret tmp_expr;
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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