347 lines
13 KiB
Rust
347 lines
13 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 core::{vec, str, option};
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import option::{some};
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import extfmt::ct::*;
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import base::*;
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import codemap::span;
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export expand_syntax_ext;
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fn expand_syntax_ext(cx: ext_ctxt, sp: span, arg: @ast::expr,
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_body: option::t<str>) -> @ast::expr {
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let args: [@ast::expr] =
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alt arg.node {
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ast::expr_vec(elts, _) { elts }
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_ {
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cx.span_fatal(sp, "#fmt requires arguments of the form `[...]`.")
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}
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};
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if vec::len::<@ast::expr>(args) == 0u {
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cx.span_fatal(sp, "#fmt requires a format string");
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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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log "Format string:";
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log 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 = bind parse_fmt_err_(cx, fmtspan, _);
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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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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_new_lit(cx: ext_ctxt, sp: span, lit: ast::lit_) -> @ast::expr {
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let sp_lit = @{node: lit, span: sp};
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ret @{id: cx.next_id(), node: ast::expr_lit(sp_lit), span: sp};
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}
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fn make_new_str(cx: ext_ctxt, sp: span, s: str) -> @ast::expr {
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let lit = ast::lit_str(s);
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ret make_new_lit(cx, sp, lit);
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}
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fn make_new_int(cx: ext_ctxt, sp: span, i: int) -> @ast::expr {
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let lit = ast::lit_int(i as i64, ast::ty_i);
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ret make_new_lit(cx, sp, lit);
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}
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fn make_new_uint(cx: ext_ctxt, sp: span, u: uint) -> @ast::expr {
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let lit = ast::lit_uint(u as u64, ast::ty_u);
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ret make_new_lit(cx, sp, lit);
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}
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fn make_add_expr(cx: ext_ctxt, sp: span, lhs: @ast::expr, rhs: @ast::expr)
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-> @ast::expr {
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let binexpr = ast::expr_binary(ast::add, lhs, rhs);
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ret @{id: cx.next_id(), node: binexpr, span: sp};
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}
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fn make_path_expr(cx: ext_ctxt, sp: span, idents: [ast::ident]) ->
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@ast::expr {
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let path = {global: false, idents: idents, types: []};
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let sp_path = @{node: path, span: sp};
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let pathexpr = ast::expr_path(sp_path);
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ret @{id: cx.next_id(), node: pathexpr, span: sp};
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}
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fn make_vec_expr(cx: ext_ctxt, sp: span, exprs: [@ast::expr]) ->
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@ast::expr {
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let vecexpr = ast::expr_vec(exprs, ast::imm);
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ret @{id: cx.next_id(), node: vecexpr, span: sp};
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}
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fn make_call(cx: ext_ctxt, sp: span, fn_path: [ast::ident],
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args: [@ast::expr]) -> @ast::expr {
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let pathexpr = make_path_expr(cx, sp, fn_path);
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let callexpr = ast::expr_call(pathexpr, args, false);
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ret @{id: cx.next_id(), node: callexpr, span: sp};
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}
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fn make_rec_expr(cx: ext_ctxt, sp: span,
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fields: [{ident: ast::ident, ex: @ast::expr}]) ->
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@ast::expr {
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let astfields: [ast::field] = [];
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for field: {ident: ast::ident, ex: @ast::expr} in fields {
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let ident = field.ident;
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let val = field.ex;
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let astfield =
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{node: {mut: ast::imm, ident: ident, expr: val}, span: sp};
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astfields += [astfield];
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}
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let recexpr = ast::expr_rec(astfields, option::none::<@ast::expr>);
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ret @{id: cx.next_id(), node: recexpr, span: sp};
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}
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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, ident: str) -> @ast::expr {
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let path = make_path_vec(cx, ident);
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ret make_path_expr(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 flagexprs: [@ast::expr] = [];
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for f: flag in flags {
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let 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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// FIXME: 0-length vectors can't have their type inferred
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// through the rec that these flags are a member of, so
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// this is a hack placeholder flag
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if vec::len::<@ast::expr>(flagexprs) == 0u {
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flagexprs += [make_rt_path_expr(cx, sp, "flag_none")];
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}
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ret make_vec_expr(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 = make_new_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 make_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 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 make_rec_expr(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 make_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: Extract all this validation into extfmt::ct
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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 f: flag in cnv.flags {
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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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_ { cx.span_unimpl(sp, unsupported); }
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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 "param: " + int::to_str(p, 10u); }
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_ { log "param: none"; }
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}
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for f: flag in c.flags {
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alt f {
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flag_left_justify. { log "flag: left justify"; }
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flag_left_zero_pad. { log "flag: left zero pad"; }
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flag_space_for_sign. { log "flag: left space pad"; }
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flag_sign_always. { log "flag: sign always"; }
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flag_alternate. { log "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 "width: count is " + int::to_str(i, 10u); }
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count_is_param(i) {
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log "width: count is param " + int::to_str(i, 10u);
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}
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count_is_next_param. { log "width: count is next param"; }
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count_implied. { log "width: count is implied"; }
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}
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alt c.precision {
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count_is(i) { log "prec: count is " + int::to_str(i, 10u); }
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count_is_param(i) {
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log "prec: count is param " + int::to_str(i, 10u);
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}
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count_is_next_param. { log "prec: count is next param"; }
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count_implied. { log "prec: count is implied"; }
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}
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alt c.ty {
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ty_bool. { log "type: bool"; }
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ty_str. { log "type: str"; }
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ty_char. { log "type: char"; }
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ty_int(s) {
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alt s {
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signed. { log "type: signed"; }
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unsigned. { log "type: unsigned"; }
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}
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}
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ty_bits. { log "type: bits"; }
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ty_hex(cs) {
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alt cs {
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case_upper. { log "type: uhex"; }
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case_lower. { log "type: lhex"; }
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}
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}
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ty_octal. { log "type: octal"; }
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ty_float. { log "type: float"; }
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}
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}
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let fmt_sp = args[0].span;
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let n = 0u;
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let tmp_expr = make_new_str(cx, sp, "");
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let nargs = vec::len::<@ast::expr>(args);
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for pc: piece in pieces {
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alt pc {
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piece_string(s) {
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let s_expr = make_new_str(cx, fmt_sp, s);
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tmp_expr = make_add_expr(cx, fmt_sp, 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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log "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 = make_add_expr(cx, fmt_sp, 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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