1ba4ca4c4a
also, avoid using type variables for fn args with omitted types unless necessary. This will be important for bound regions in fn types. fixes #2093
1847 lines
51 KiB
Rust
1847 lines
51 KiB
Rust
import parse::classify::*;
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import parse::comments;
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import parse::lexer;
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import codemap::codemap;
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import pp::{break_offset, word, printer,
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space, zerobreak, hardbreak, breaks, consistent,
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inconsistent, eof};
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import diagnostic;
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import ast_util::operator_prec;
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// The ps is stored here to prevent recursive type.
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enum ann_node {
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node_block(ps, ast::blk),
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node_item(ps, @ast::item),
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node_expr(ps, @ast::expr),
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node_pat(ps, @ast::pat),
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}
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type pp_ann = {pre: fn@(ann_node), post: fn@(ann_node)};
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fn no_ann() -> pp_ann {
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fn ignore(_node: ann_node) { }
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ret {pre: ignore, post: ignore};
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}
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type ps =
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@{s: pp::printer,
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cm: option<codemap>,
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comments: option<[comments::cmnt]>,
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literals: option<[comments::lit]>,
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mut cur_cmnt: uint,
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mut cur_lit: uint,
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mut boxes: [pp::breaks],
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ann: pp_ann};
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fn ibox(s: ps, u: uint) { s.boxes += [pp::inconsistent]; pp::ibox(s.s, u); }
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fn end(s: ps) { vec::pop(s.boxes); pp::end(s.s); }
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fn rust_printer(writer: io::writer) -> ps {
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let boxes: [pp::breaks] = [];
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ret @{s: pp::mk_printer(writer, default_columns),
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cm: none::<codemap>,
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comments: none::<[comments::cmnt]>,
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literals: none::<[comments::lit]>,
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mut cur_cmnt: 0u,
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mut cur_lit: 0u,
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mut boxes: boxes,
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ann: no_ann()};
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}
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const indent_unit: uint = 4u;
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const alt_indent_unit: uint = 2u;
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const default_columns: uint = 78u;
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// Requires you to pass an input filename and reader so that
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// it can scan the input text for comments and literals to
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// copy forward.
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fn print_crate(cm: codemap, span_diagnostic: diagnostic::span_handler,
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crate: @ast::crate, filename: str, in: io::reader,
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out: io::writer, ann: pp_ann) {
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let boxes: [pp::breaks] = [];
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let r = comments::gather_comments_and_literals(span_diagnostic,
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filename, in);
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let s =
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@{s: pp::mk_printer(out, default_columns),
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cm: some(cm),
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comments: some(r.cmnts),
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literals: some(r.lits),
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mut cur_cmnt: 0u,
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mut cur_lit: 0u,
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mut boxes: boxes,
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ann: ann};
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print_crate_(s, crate);
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}
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fn print_crate_(s: ps, &&crate: @ast::crate) {
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print_mod(s, crate.node.module, crate.node.attrs);
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print_remaining_comments(s);
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eof(s.s);
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}
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fn ty_to_str(ty: @ast::ty) -> str { be to_str(ty, print_type); }
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fn pat_to_str(pat: @ast::pat) -> str { be to_str(pat, print_pat); }
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fn expr_to_str(e: @ast::expr) -> str { be to_str(e, print_expr); }
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fn stmt_to_str(s: ast::stmt) -> str { be to_str(s, print_stmt); }
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fn item_to_str(i: @ast::item) -> str { be to_str(i, print_item); }
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fn attr_to_str(i: ast::attribute) -> str { be to_str(i, print_attribute); }
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fn typarams_to_str(tps: [ast::ty_param]) -> str {
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be to_str(tps, print_type_params)
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}
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fn path_to_str(&&p: @ast::path) -> str {
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be to_str(p, bind print_path(_, _, false));
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}
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fn fun_to_str(decl: ast::fn_decl, name: ast::ident,
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params: [ast::ty_param]) -> str {
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let buffer = io::mem_buffer();
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let s = rust_printer(io::mem_buffer_writer(buffer));
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print_fn(s, decl, name, params);
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end(s); // Close the head box
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end(s); // Close the outer box
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eof(s.s);
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io::mem_buffer_str(buffer)
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}
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#[test]
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fn test_fun_to_str() {
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let decl: ast::fn_decl = {
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inputs: [],
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output: @{id: 0,
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node: ast::ty_nil,
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span: ast_util::dummy_sp()},
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purity: ast::impure_fn,
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cf: ast::return_val,
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constraints: []
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};
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assert fun_to_str(decl, "a", []) == "fn a()";
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}
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fn res_to_str(decl: ast::fn_decl, name: ast::ident,
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params: [ast::ty_param], rp: ast::region_param) -> str {
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let buffer = io::mem_buffer();
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let s = rust_printer(io::mem_buffer_writer(buffer));
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print_res(s, decl, name, params, rp);
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end(s); // Close the head box
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end(s); // Close the outer box
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eof(s.s);
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io::mem_buffer_str(buffer)
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}
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#[test]
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fn test_res_to_str() {
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let decl: ast::fn_decl = {
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inputs: [{
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mode: ast::expl(ast::by_val),
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ty: @{id: 0,
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node: ast::ty_nil,
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span: ast_util::dummy_sp()},
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ident: "b",
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id: 0
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}],
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output: @{id: 0,
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node: ast::ty_nil,
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span: ast_util::dummy_sp()},
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purity: ast::impure_fn,
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cf: ast::return_val,
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constraints: []
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};
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assert res_to_str(decl, "a", []) == "resource a(b: ())";
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}
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fn block_to_str(blk: ast::blk) -> str {
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let buffer = io::mem_buffer();
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let s = rust_printer(io::mem_buffer_writer(buffer));
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// containing cbox, will be closed by print-block at }
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cbox(s, indent_unit);
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// head-ibox, will be closed by print-block after {
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ibox(s, 0u);
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print_block(s, blk);
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eof(s.s);
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io::mem_buffer_str(buffer)
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}
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fn meta_item_to_str(mi: ast::meta_item) -> str {
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ret to_str(@mi, print_meta_item);
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}
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fn attribute_to_str(attr: ast::attribute) -> str {
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be to_str(attr, print_attribute);
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}
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fn variant_to_str(var: ast::variant) -> str {
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be to_str(var, print_variant);
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}
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#[test]
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fn test_variant_to_str() {
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let var = ast_util::respan(ast_util::dummy_sp(), {
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name: "principle_skinner",
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attrs: [],
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args: [],
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id: 0,
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disr_expr: none
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});
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let varstr = variant_to_str(var);
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assert varstr == "principle_skinner";
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}
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fn cbox(s: ps, u: uint) { s.boxes += [pp::consistent]; pp::cbox(s.s, u); }
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fn box(s: ps, u: uint, b: pp::breaks) { s.boxes += [b]; pp::box(s.s, u, b); }
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fn nbsp(s: ps) { word(s.s, " "); }
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fn word_nbsp(s: ps, w: str) { word(s.s, w); nbsp(s); }
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fn word_space(s: ps, w: str) { word(s.s, w); space(s.s); }
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fn popen(s: ps) { word(s.s, "("); }
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fn pclose(s: ps) { word(s.s, ")"); }
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fn head(s: ps, w: str) {
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// outer-box is consistent
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cbox(s, indent_unit);
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// head-box is inconsistent
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ibox(s, str::len(w) + 1u);
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// keyword that starts the head
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word_nbsp(s, w);
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}
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fn bopen(s: ps) {
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word(s.s, "{");
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end(s); // close the head-box
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}
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fn bclose_(s: ps, span: codemap::span, indented: uint) {
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maybe_print_comment(s, span.hi);
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break_offset_if_not_bol(s, 1u, -(indented as int));
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word(s.s, "}");
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end(s); // close the outer-box
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}
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fn bclose(s: ps, span: codemap::span) { bclose_(s, span, indent_unit); }
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fn is_begin(s: ps) -> bool {
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alt s.s.last_token() { pp::BEGIN(_) { true } _ { false } }
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}
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fn is_end(s: ps) -> bool {
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alt s.s.last_token() { pp::END { true } _ { false } }
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}
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fn is_bol(s: ps) -> bool {
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ret s.s.last_token() == pp::EOF ||
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s.s.last_token() == pp::hardbreak_tok();
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}
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fn in_cbox(s: ps) -> bool {
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let len = vec::len(s.boxes);
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if len == 0u { ret false; }
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ret s.boxes[len - 1u] == pp::consistent;
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}
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fn hardbreak_if_not_bol(s: ps) { if !is_bol(s) { hardbreak(s.s); } }
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fn space_if_not_bol(s: ps) { if !is_bol(s) { space(s.s); } }
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fn break_offset_if_not_bol(s: ps, n: uint, off: int) {
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if !is_bol(s) {
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break_offset(s.s, n, off);
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} else {
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if off != 0 && s.s.last_token() == pp::hardbreak_tok() {
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// We do something pretty sketchy here: tuck the nonzero
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// offset-adjustment we were going to deposit along with the
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// break into the previous hardbreak.
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s.s.replace_last_token(pp::hardbreak_tok_offset(off));
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}
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}
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}
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// Synthesizes a comment that was not textually present in the original source
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// file.
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fn synth_comment(s: ps, text: str) {
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word(s.s, "/*");
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space(s.s);
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word(s.s, text);
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space(s.s);
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word(s.s, "*/");
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}
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fn commasep<IN>(s: ps, b: breaks, elts: [IN], op: fn(ps, IN)) {
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box(s, 0u, b);
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let mut first = true;
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for elts.each {|elt|
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if first { first = false; } else { word_space(s, ","); }
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op(s, elt);
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}
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end(s);
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}
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fn commasep_cmnt<IN>(s: ps, b: breaks, elts: [IN], op: fn(ps, IN),
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get_span: fn(IN) -> codemap::span) {
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box(s, 0u, b);
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let len = vec::len::<IN>(elts);
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let mut i = 0u;
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for elts.each {|elt|
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maybe_print_comment(s, get_span(elt).hi);
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op(s, elt);
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i += 1u;
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if i < len {
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word(s.s, ",");
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maybe_print_trailing_comment(s, get_span(elt),
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some(get_span(elts[i]).hi));
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space_if_not_bol(s);
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}
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}
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end(s);
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}
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fn commasep_exprs(s: ps, b: breaks, exprs: [@ast::expr]) {
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fn expr_span(&&expr: @ast::expr) -> codemap::span { ret expr.span; }
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commasep_cmnt(s, b, exprs, print_expr, expr_span);
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}
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fn print_mod(s: ps, _mod: ast::_mod, attrs: [ast::attribute]) {
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print_inner_attributes(s, attrs);
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for _mod.view_items.each {|vitem|
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print_view_item(s, vitem);
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}
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for _mod.items.each {|item| print_item(s, item); }
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}
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fn print_native_mod(s: ps, nmod: ast::native_mod, attrs: [ast::attribute]) {
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print_inner_attributes(s, attrs);
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for nmod.view_items.each {|vitem|
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print_view_item(s, vitem);
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}
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for nmod.items.each {|item| print_native_item(s, item); }
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}
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fn print_region(s: ps, region: @ast::region) {
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alt region.node {
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ast::re_anon { word_space(s, "&"); }
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ast::re_named(name) {
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word(s.s, "&");
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word_space(s, name);
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}
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}
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}
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fn print_type(s: ps, &&ty: @ast::ty) {
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maybe_print_comment(s, ty.span.lo);
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ibox(s, 0u);
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alt ty.node {
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ast::ty_nil { word(s.s, "()"); }
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ast::ty_bot { word(s.s, "!"); }
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ast::ty_box(mt) { word(s.s, "@"); print_mt(s, mt); }
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ast::ty_uniq(mt) { word(s.s, "~"); print_mt(s, mt); }
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ast::ty_vec(mt) {
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word(s.s, "[");
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alt mt.mutbl {
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ast::m_mutbl { word_space(s, "mut"); }
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ast::m_const { word_space(s, "const"); }
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ast::m_imm { }
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}
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print_type(s, mt.ty);
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word(s.s, "]");
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}
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ast::ty_ptr(mt) { word(s.s, "*"); print_mt(s, mt); }
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ast::ty_rptr(region, mt) {
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alt region.node {
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ast::re_anon { word(s.s, "&"); }
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_ { print_region(s, region); word(s.s, "."); }
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}
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print_mt(s, mt);
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}
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ast::ty_rec(fields) {
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word(s.s, "{");
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fn print_field(s: ps, f: ast::ty_field) {
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cbox(s, indent_unit);
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print_mutability(s, f.node.mt.mutbl);
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word(s.s, f.node.ident);
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word_space(s, ":");
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print_type(s, f.node.mt.ty);
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end(s);
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}
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fn get_span(f: ast::ty_field) -> codemap::span { ret f.span; }
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commasep_cmnt(s, consistent, fields, print_field, get_span);
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word(s.s, ",}");
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}
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ast::ty_tup(elts) {
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popen(s);
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commasep(s, inconsistent, elts, print_type);
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pclose(s);
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}
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ast::ty_fn(proto, d) {
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print_ty_fn(s, some(proto), d, none, none);
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}
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ast::ty_path(path, _) { print_path(s, path, false); }
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ast::ty_constr(t, cs) {
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print_type(s, t);
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space(s.s);
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word(s.s, constrs_str(cs, ty_constr_to_str));
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}
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ast::ty_vstore(t, v) {
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print_type(s, t);
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print_vstore(s, v);
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}
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ast::ty_mac(_) {
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fail "print_type doesn't know how to print a ty_mac";
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}
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ast::ty_infer {
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fail "print_type shouldn't see a ty_infer";
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}
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}
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end(s);
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}
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fn print_native_item(s: ps, item: @ast::native_item) {
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hardbreak_if_not_bol(s);
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maybe_print_comment(s, item.span.lo);
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print_outer_attributes(s, item.attrs);
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alt item.node {
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ast::native_item_fn(decl, typarams) {
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print_fn(s, decl, item.ident, typarams);
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end(s); // end head-ibox
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word(s.s, ";");
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end(s); // end the outer fn box
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}
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}
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}
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fn print_item(s: ps, &&item: @ast::item) {
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hardbreak_if_not_bol(s);
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maybe_print_comment(s, item.span.lo);
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print_outer_attributes(s, item.attrs);
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let ann_node = node_item(s, item);
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s.ann.pre(ann_node);
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alt item.node {
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ast::item_const(ty, expr) {
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head(s, "const");
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word_space(s, item.ident + ":");
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print_type(s, ty);
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space(s.s);
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end(s); // end the head-ibox
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word_space(s, "=");
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print_expr(s, expr);
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word(s.s, ";");
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end(s); // end the outer cbox
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}
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ast::item_fn(decl, typarams, body) {
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print_fn(s, decl, item.ident, typarams);
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word(s.s, " ");
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print_block_with_attrs(s, body, item.attrs);
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}
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ast::item_mod(_mod) {
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head(s, "mod");
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word_nbsp(s, item.ident);
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bopen(s);
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print_mod(s, _mod, item.attrs);
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bclose(s, item.span);
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}
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ast::item_native_mod(nmod) {
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head(s, "native");
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word_nbsp(s, "mod");
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word_nbsp(s, item.ident);
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bopen(s);
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print_native_mod(s, nmod, item.attrs);
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bclose(s, item.span);
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}
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ast::item_ty(ty, params, rp) {
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ibox(s, indent_unit);
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ibox(s, 0u);
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word_nbsp(s, "type");
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word(s.s, item.ident);
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print_region_param(s, rp);
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print_type_params(s, params);
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end(s); // end the inner ibox
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space(s.s);
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word_space(s, "=");
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print_type(s, ty);
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word(s.s, ";");
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end(s); // end the outer ibox
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}
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ast::item_enum(variants, params, rp) {
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let newtype =
|
|
vec::len(variants) == 1u &&
|
|
str::eq(item.ident, variants[0].node.name) &&
|
|
vec::len(variants[0].node.args) == 1u;
|
|
if newtype {
|
|
ibox(s, indent_unit);
|
|
word_space(s, "enum");
|
|
} else { head(s, "enum"); }
|
|
word(s.s, item.ident);
|
|
print_region_param(s, rp);
|
|
print_type_params(s, params);
|
|
space(s.s);
|
|
if newtype {
|
|
word_space(s, "=");
|
|
print_type(s, variants[0].node.args[0].ty);
|
|
word(s.s, ";");
|
|
end(s);
|
|
} else {
|
|
bopen(s);
|
|
for variants.each {|v|
|
|
space_if_not_bol(s);
|
|
maybe_print_comment(s, v.span.lo);
|
|
print_outer_attributes(s, v.node.attrs);
|
|
ibox(s, indent_unit);
|
|
print_variant(s, v);
|
|
word(s.s, ",");
|
|
end(s);
|
|
maybe_print_trailing_comment(s, v.span, none::<uint>);
|
|
}
|
|
bclose(s, item.span);
|
|
}
|
|
}
|
|
ast::item_class(tps,ifaces,items,ctor, rp) {
|
|
head(s, "class");
|
|
word_nbsp(s, item.ident);
|
|
print_region_param(s, rp);
|
|
print_type_params(s, tps);
|
|
word_space(s, "implements");
|
|
commasep(s, inconsistent, ifaces, {|s, p|
|
|
print_path(s, p.path, false)});
|
|
bopen(s);
|
|
hardbreak_if_not_bol(s);
|
|
maybe_print_comment(s, ctor.span.lo);
|
|
head(s, "new");
|
|
print_fn_args_and_ret(s, ctor.node.dec);
|
|
space(s.s);
|
|
print_block(s, ctor.node.body);
|
|
for items.each {|ci|
|
|
/*
|
|
FIXME: collect all private items and print them
|
|
in a single "priv" section
|
|
|
|
tjc: I'm not going to fix this yet b/c we might
|
|
change how exports work, including for class items
|
|
(see #1893)
|
|
*/
|
|
hardbreak_if_not_bol(s);
|
|
maybe_print_comment(s, ci.span.lo);
|
|
let pr = ast_util::class_member_privacy(ci);
|
|
alt pr {
|
|
ast::priv {
|
|
head(s, "priv");
|
|
bopen(s);
|
|
hardbreak_if_not_bol(s);
|
|
}
|
|
_ {}
|
|
}
|
|
alt ci.node {
|
|
ast::instance_var(nm, t, mt, _,_) {
|
|
word_nbsp(s, "let");
|
|
alt mt {
|
|
ast::class_mutable { word_nbsp(s, "mut"); }
|
|
_ {}
|
|
}
|
|
word(s.s, nm);
|
|
word_nbsp(s, ":");
|
|
print_type(s, t);
|
|
word(s.s, ";");
|
|
}
|
|
ast::class_method(m) {
|
|
print_method(s, m);
|
|
}
|
|
}
|
|
alt pr {
|
|
ast::priv { bclose(s, ci.span); }
|
|
_ {}
|
|
}
|
|
}
|
|
bclose(s, item.span);
|
|
}
|
|
ast::item_impl(tps, rp, ifce, ty, methods) {
|
|
head(s, "impl");
|
|
word(s.s, item.ident);
|
|
print_region_param(s, rp);
|
|
print_type_params(s, tps);
|
|
space(s.s);
|
|
option::iter(ifce, {|p|
|
|
word_nbsp(s, "of");
|
|
print_path(s, p.path, false);
|
|
space(s.s);
|
|
});
|
|
word_nbsp(s, "for");
|
|
print_type(s, ty);
|
|
space(s.s);
|
|
bopen(s);
|
|
for methods.each {|meth|
|
|
print_method(s, meth);
|
|
}
|
|
bclose(s, item.span);
|
|
}
|
|
ast::item_iface(tps, rp, methods) {
|
|
head(s, "iface");
|
|
word(s.s, item.ident);
|
|
print_region_param(s, rp);
|
|
print_type_params(s, tps);
|
|
word(s.s, " ");
|
|
bopen(s);
|
|
for methods.each {|meth| print_ty_method(s, meth); }
|
|
bclose(s, item.span);
|
|
}
|
|
ast::item_res(decl, tps, body, dt_id, ct_id, rp) {
|
|
print_res(s, decl, item.ident, tps, rp);
|
|
print_block(s, body);
|
|
}
|
|
}
|
|
s.ann.post(ann_node);
|
|
}
|
|
|
|
fn print_res(s: ps, decl: ast::fn_decl, name: ast::ident,
|
|
typarams: [ast::ty_param], rp: ast::region_param) {
|
|
head(s, "resource");
|
|
word(s.s, name);
|
|
print_region_param(s, rp);
|
|
print_type_params(s, typarams);
|
|
popen(s);
|
|
word_space(s, decl.inputs[0].ident + ":");
|
|
print_type(s, decl.inputs[0].ty);
|
|
pclose(s);
|
|
space(s.s);
|
|
}
|
|
|
|
fn print_variant(s: ps, v: ast::variant) {
|
|
word(s.s, v.node.name);
|
|
if vec::len(v.node.args) > 0u {
|
|
popen(s);
|
|
fn print_variant_arg(s: ps, arg: ast::variant_arg) {
|
|
print_type(s, arg.ty);
|
|
}
|
|
commasep(s, consistent, v.node.args, print_variant_arg);
|
|
pclose(s);
|
|
}
|
|
alt v.node.disr_expr {
|
|
some(d) {
|
|
space(s.s);
|
|
word_space(s, "=");
|
|
print_expr(s, d);
|
|
}
|
|
_ {}
|
|
}
|
|
}
|
|
|
|
fn print_ty_method(s: ps, m: ast::ty_method) {
|
|
hardbreak_if_not_bol(s);
|
|
maybe_print_comment(s, m.span.lo);
|
|
print_outer_attributes(s, m.attrs);
|
|
print_ty_fn(s, none, m.decl, some(m.ident), some(m.tps));
|
|
word(s.s, ";");
|
|
}
|
|
|
|
fn print_method(s: ps, meth: @ast::method) {
|
|
hardbreak_if_not_bol(s);
|
|
maybe_print_comment(s, meth.span.lo);
|
|
print_outer_attributes(s, meth.attrs);
|
|
print_fn(s, meth.decl, meth.ident, meth.tps);
|
|
word(s.s, " ");
|
|
print_block_with_attrs(s, meth.body, meth.attrs);
|
|
}
|
|
|
|
fn print_outer_attributes(s: ps, attrs: [ast::attribute]) {
|
|
let mut count = 0;
|
|
for attrs.each {|attr|
|
|
alt attr.node.style {
|
|
ast::attr_outer { print_attribute(s, attr); count += 1; }
|
|
_ {/* fallthrough */ }
|
|
}
|
|
}
|
|
if count > 0 { hardbreak_if_not_bol(s); }
|
|
}
|
|
|
|
fn print_inner_attributes(s: ps, attrs: [ast::attribute]) {
|
|
let mut count = 0;
|
|
for attrs.each {|attr|
|
|
alt attr.node.style {
|
|
ast::attr_inner {
|
|
print_attribute(s, attr);
|
|
word(s.s, ";");
|
|
count += 1;
|
|
}
|
|
_ {/* fallthrough */ }
|
|
}
|
|
}
|
|
if count > 0 { hardbreak_if_not_bol(s); }
|
|
}
|
|
|
|
fn print_attribute(s: ps, attr: ast::attribute) {
|
|
hardbreak_if_not_bol(s);
|
|
maybe_print_comment(s, attr.span.lo);
|
|
word(s.s, "#[");
|
|
print_meta_item(s, @attr.node.value);
|
|
word(s.s, "]");
|
|
}
|
|
|
|
|
|
fn print_stmt(s: ps, st: ast::stmt) {
|
|
maybe_print_comment(s, st.span.lo);
|
|
alt st.node {
|
|
ast::stmt_decl(decl, _) {
|
|
print_decl(s, decl);
|
|
}
|
|
ast::stmt_expr(expr, _) {
|
|
space_if_not_bol(s);
|
|
print_expr(s, expr);
|
|
}
|
|
ast::stmt_semi(expr, _) {
|
|
space_if_not_bol(s);
|
|
print_expr(s, expr);
|
|
word(s.s, ";");
|
|
}
|
|
}
|
|
if parse::classify::stmt_ends_with_semi(st) { word(s.s, ";"); }
|
|
maybe_print_trailing_comment(s, st.span, none::<uint>);
|
|
}
|
|
|
|
fn print_block(s: ps, blk: ast::blk) {
|
|
print_possibly_embedded_block(s, blk, block_normal, indent_unit);
|
|
}
|
|
|
|
fn print_block_with_attrs(s: ps, blk: ast::blk, attrs: [ast::attribute]) {
|
|
print_possibly_embedded_block_(s, blk, block_normal, indent_unit, attrs);
|
|
}
|
|
|
|
enum embed_type { block_macro, block_block_fn, block_normal, }
|
|
|
|
fn print_possibly_embedded_block(s: ps, blk: ast::blk, embedded: embed_type,
|
|
indented: uint) {
|
|
print_possibly_embedded_block_(
|
|
s, blk, embedded, indented, []);
|
|
}
|
|
|
|
fn print_possibly_embedded_block_(s: ps, blk: ast::blk, embedded: embed_type,
|
|
indented: uint, attrs: [ast::attribute]) {
|
|
alt blk.node.rules {
|
|
ast::unchecked_blk { word(s.s, "unchecked"); }
|
|
ast::unsafe_blk { word(s.s, "unsafe"); }
|
|
ast::default_blk { }
|
|
}
|
|
maybe_print_comment(s, blk.span.lo);
|
|
let ann_node = node_block(s, blk);
|
|
s.ann.pre(ann_node);
|
|
alt embedded {
|
|
block_macro { word(s.s, "#{"); end(s); }
|
|
block_block_fn { end(s); }
|
|
block_normal { bopen(s); }
|
|
}
|
|
|
|
print_inner_attributes(s, attrs);
|
|
|
|
for blk.node.view_items.each {|vi| print_view_item(s, vi); }
|
|
for blk.node.stmts.each {|st|
|
|
print_stmt(s, *st);
|
|
}
|
|
alt blk.node.expr {
|
|
some(expr) {
|
|
space_if_not_bol(s);
|
|
print_expr(s, expr);
|
|
maybe_print_trailing_comment(s, expr.span, some(blk.span.hi));
|
|
}
|
|
_ { }
|
|
}
|
|
bclose_(s, blk.span, indented);
|
|
s.ann.post(ann_node);
|
|
}
|
|
|
|
// ret and fail, without arguments cannot appear is the discriminant of if,
|
|
// alt, do, & while unambiguously without being parenthesized
|
|
fn print_maybe_parens_discrim(s: ps, e: @ast::expr) {
|
|
let disambig = alt e.node {
|
|
ast::expr_ret(none) | ast::expr_fail(none) { true }
|
|
_ { false }
|
|
};
|
|
if disambig { popen(s); }
|
|
print_expr(s, e);
|
|
if disambig { pclose(s); }
|
|
}
|
|
|
|
fn print_if(s: ps, test: @ast::expr, blk: ast::blk,
|
|
elseopt: option<@ast::expr>, chk: bool) {
|
|
head(s, "if");
|
|
if chk { word_nbsp(s, "check"); }
|
|
print_maybe_parens_discrim(s, test);
|
|
space(s.s);
|
|
print_block(s, blk);
|
|
fn do_else(s: ps, els: option<@ast::expr>) {
|
|
alt els {
|
|
some(_else) {
|
|
alt _else.node {
|
|
// "another else-if"
|
|
ast::expr_if(i, t, e) {
|
|
cbox(s, indent_unit - 1u);
|
|
ibox(s, 0u);
|
|
word(s.s, " else if ");
|
|
print_maybe_parens_discrim(s, i);
|
|
space(s.s);
|
|
print_block(s, t);
|
|
do_else(s, e);
|
|
}
|
|
// "final else"
|
|
ast::expr_block(b) {
|
|
cbox(s, indent_unit - 1u);
|
|
ibox(s, 0u);
|
|
word(s.s, " else ");
|
|
print_block(s, b);
|
|
}
|
|
// BLEAH, constraints would be great here
|
|
_ {
|
|
fail "print_if saw if with weird alternative";
|
|
}
|
|
}
|
|
}
|
|
_ {/* fall through */ }
|
|
}
|
|
}
|
|
do_else(s, elseopt);
|
|
}
|
|
|
|
fn print_mac(s: ps, m: ast::mac) {
|
|
alt m.node {
|
|
ast::mac_invoc(path, arg, body) {
|
|
word(s.s, "#");
|
|
print_path(s, path, false);
|
|
alt arg {
|
|
some(@{node: ast::expr_vec(_, _), _}) { }
|
|
_ { word(s.s, " "); }
|
|
}
|
|
option::iter(arg, bind print_expr(s, _));
|
|
// FIXME: extension 'body' (#2339)
|
|
}
|
|
ast::mac_embed_type(ty) {
|
|
word(s.s, "#<");
|
|
print_type(s, ty);
|
|
word(s.s, ">");
|
|
}
|
|
ast::mac_embed_block(blk) {
|
|
print_possibly_embedded_block(s, blk, block_normal, indent_unit);
|
|
}
|
|
ast::mac_ellipsis { word(s.s, "..."); }
|
|
ast::mac_var(v) { word(s.s, #fmt("$%u", v)); }
|
|
_ { /* fixme */ }
|
|
}
|
|
}
|
|
|
|
fn print_vstore(s: ps, t: ast::vstore) {
|
|
alt t {
|
|
ast::vstore_fixed(some(i)) { word_space(s, #fmt("/%u", i)); }
|
|
ast::vstore_fixed(none) { word_space(s, "/_"); }
|
|
ast::vstore_uniq { word_space(s, "/~"); }
|
|
ast::vstore_box { word_space(s, "/@"); }
|
|
ast::vstore_slice(r) { word(s.s, "/"); print_region(s, r); }
|
|
}
|
|
}
|
|
|
|
fn print_expr(s: ps, &&expr: @ast::expr) {
|
|
maybe_print_comment(s, expr.span.lo);
|
|
ibox(s, indent_unit);
|
|
let ann_node = node_expr(s, expr);
|
|
s.ann.pre(ann_node);
|
|
alt expr.node {
|
|
ast::expr_vstore(e, v) {
|
|
print_expr(s, e);
|
|
print_vstore(s, v);
|
|
}
|
|
ast::expr_vec(exprs, mutbl) {
|
|
ibox(s, indent_unit);
|
|
word(s.s, "[");
|
|
if mutbl == ast::m_mutbl {
|
|
word(s.s, "mut");
|
|
if vec::len(exprs) > 0u { nbsp(s); }
|
|
}
|
|
commasep_exprs(s, inconsistent, exprs);
|
|
word(s.s, "]");
|
|
end(s);
|
|
}
|
|
ast::expr_rec(fields, wth) {
|
|
fn print_field(s: ps, field: ast::field) {
|
|
ibox(s, indent_unit);
|
|
if field.node.mutbl == ast::m_mutbl { word_nbsp(s, "mut"); }
|
|
word(s.s, field.node.ident);
|
|
word_space(s, ":");
|
|
print_expr(s, field.node.expr);
|
|
end(s);
|
|
}
|
|
fn get_span(field: ast::field) -> codemap::span { ret field.span; }
|
|
word(s.s, "{");
|
|
commasep_cmnt(s, consistent, fields, print_field, get_span);
|
|
alt wth {
|
|
some(expr) {
|
|
if vec::len(fields) > 0u { space(s.s); }
|
|
ibox(s, indent_unit);
|
|
word_space(s, "with");
|
|
print_expr(s, expr);
|
|
end(s);
|
|
}
|
|
_ { word(s.s, ","); }
|
|
}
|
|
word(s.s, "}");
|
|
}
|
|
ast::expr_tup(exprs) {
|
|
popen(s);
|
|
commasep_exprs(s, inconsistent, exprs);
|
|
pclose(s);
|
|
}
|
|
ast::expr_call(func, args, has_block) {
|
|
let mut base_args = args;
|
|
let blk = if has_block {
|
|
let blk_arg = vec::pop(base_args);
|
|
alt blk_arg.node {
|
|
ast::expr_loop_body(_) { word_nbsp(s, "for"); }
|
|
_ {}
|
|
}
|
|
some(blk_arg)
|
|
} else { none };
|
|
print_expr_parens_if_not_bot(s, func);
|
|
if !has_block || vec::len(base_args) > 0u {
|
|
popen(s);
|
|
commasep_exprs(s, inconsistent, base_args);
|
|
pclose(s);
|
|
}
|
|
if has_block {
|
|
nbsp(s);
|
|
print_expr(s, option::get(blk));
|
|
}
|
|
}
|
|
ast::expr_bind(func, args) {
|
|
fn print_opt(s: ps, expr: option<@ast::expr>) {
|
|
alt expr {
|
|
some(expr) { print_expr(s, expr); }
|
|
_ { word(s.s, "_"); }
|
|
}
|
|
}
|
|
|
|
// "bind" keyword is only needed if there are no "_" arguments.
|
|
if !vec::any(args) {|arg| option::is_none(arg) } {
|
|
word_nbsp(s, "bind");
|
|
}
|
|
|
|
print_expr(s, func);
|
|
popen(s);
|
|
commasep(s, inconsistent, args, print_opt);
|
|
pclose(s);
|
|
}
|
|
ast::expr_binary(op, lhs, rhs) {
|
|
let prec = operator_prec(op);
|
|
print_op_maybe_parens(s, lhs, prec);
|
|
space(s.s);
|
|
word_space(s, ast_util::binop_to_str(op));
|
|
print_op_maybe_parens(s, rhs, prec + 1u);
|
|
}
|
|
ast::expr_unary(op, expr) {
|
|
word(s.s, ast_util::unop_to_str(op));
|
|
print_op_maybe_parens(s, expr, parse::prec::unop_prec);
|
|
}
|
|
ast::expr_addr_of(m, expr) {
|
|
word(s.s, "&");
|
|
print_mutability(s, m);
|
|
print_expr(s, expr);
|
|
}
|
|
ast::expr_lit(lit) { print_literal(s, lit); }
|
|
ast::expr_cast(expr, ty) {
|
|
print_op_maybe_parens(s, expr, parse::prec::as_prec);
|
|
space(s.s);
|
|
word_space(s, "as");
|
|
print_type(s, ty);
|
|
}
|
|
ast::expr_if(test, blk, elseopt) {
|
|
print_if(s, test, blk, elseopt, false);
|
|
}
|
|
ast::expr_if_check(test, blk, elseopt) {
|
|
print_if(s, test, blk, elseopt, true);
|
|
}
|
|
ast::expr_while(test, blk) {
|
|
head(s, "while");
|
|
print_maybe_parens_discrim(s, test);
|
|
space(s.s);
|
|
print_block(s, blk);
|
|
}
|
|
ast::expr_loop(blk) {
|
|
head(s, "loop");
|
|
space(s.s);
|
|
print_block(s, blk);
|
|
}
|
|
ast::expr_do_while(blk, expr) {
|
|
head(s, "do");
|
|
space(s.s);
|
|
print_block(s, blk);
|
|
space(s.s);
|
|
word_space(s, "while");
|
|
print_expr(s, expr);
|
|
}
|
|
ast::expr_alt(expr, arms, mode) {
|
|
cbox(s, alt_indent_unit);
|
|
ibox(s, 4u);
|
|
word_nbsp(s, "alt");
|
|
if mode == ast::alt_check { word_nbsp(s, "check"); }
|
|
print_maybe_parens_discrim(s, expr);
|
|
space(s.s);
|
|
bopen(s);
|
|
for arms.each {|arm|
|
|
space(s.s);
|
|
cbox(s, alt_indent_unit);
|
|
ibox(s, 0u);
|
|
let mut first = true;
|
|
for arm.pats.each {|p|
|
|
if first {
|
|
first = false;
|
|
} else { space(s.s); word_space(s, "|"); }
|
|
print_pat(s, p);
|
|
}
|
|
space(s.s);
|
|
alt arm.guard {
|
|
some(e) { word_space(s, "if"); print_expr(s, e); space(s.s); }
|
|
none { }
|
|
}
|
|
print_possibly_embedded_block(s, arm.body, block_normal,
|
|
alt_indent_unit);
|
|
}
|
|
bclose_(s, expr.span, alt_indent_unit);
|
|
}
|
|
ast::expr_fn(proto, decl, body, cap_clause) {
|
|
// containing cbox, will be closed by print-block at }
|
|
cbox(s, indent_unit);
|
|
// head-box, will be closed by print-block at start
|
|
ibox(s, 0u);
|
|
word(s.s, proto_to_str(proto));
|
|
print_cap_clause(s, *cap_clause);
|
|
print_fn_args_and_ret(s, decl);
|
|
space(s.s);
|
|
print_block(s, body);
|
|
}
|
|
ast::expr_fn_block(decl, body) {
|
|
// containing cbox, will be closed by print-block at }
|
|
cbox(s, indent_unit);
|
|
// head-box, will be closed by print-block at start
|
|
ibox(s, 0u);
|
|
word(s.s, "{");
|
|
print_fn_block_args(s, decl);
|
|
print_possibly_embedded_block(s, body, block_block_fn, indent_unit);
|
|
}
|
|
ast::expr_loop_body(body) {
|
|
print_expr(s, body);
|
|
}
|
|
ast::expr_block(blk) {
|
|
// containing cbox, will be closed by print-block at }
|
|
cbox(s, indent_unit);
|
|
// head-box, will be closed by print-block after {
|
|
ibox(s, 0u);
|
|
print_block(s, blk);
|
|
}
|
|
ast::expr_copy(e) { word_space(s, "copy"); print_expr(s, e); }
|
|
ast::expr_move(lhs, rhs) {
|
|
print_expr(s, lhs);
|
|
space(s.s);
|
|
word_space(s, "<-");
|
|
print_expr(s, rhs);
|
|
}
|
|
ast::expr_assign(lhs, rhs) {
|
|
print_expr(s, lhs);
|
|
space(s.s);
|
|
word_space(s, "=");
|
|
print_expr(s, rhs);
|
|
}
|
|
ast::expr_swap(lhs, rhs) {
|
|
print_expr(s, lhs);
|
|
space(s.s);
|
|
word_space(s, "<->");
|
|
print_expr(s, rhs);
|
|
}
|
|
ast::expr_assign_op(op, lhs, rhs) {
|
|
print_expr(s, lhs);
|
|
space(s.s);
|
|
word(s.s, ast_util::binop_to_str(op));
|
|
word_space(s, "=");
|
|
print_expr(s, rhs);
|
|
}
|
|
ast::expr_field(expr, id, tys) {
|
|
// Deal with '10.x'
|
|
if ends_in_lit_int(expr) {
|
|
popen(s); print_expr(s, expr); pclose(s);
|
|
} else {
|
|
print_expr_parens_if_not_bot(s, expr);
|
|
}
|
|
word(s.s, ".");
|
|
word(s.s, id);
|
|
if vec::len(tys) > 0u {
|
|
word(s.s, "::<");
|
|
commasep(s, inconsistent, tys, print_type);
|
|
word(s.s, ">");
|
|
}
|
|
}
|
|
ast::expr_index(expr, index) {
|
|
print_expr_parens_if_not_bot(s, expr);
|
|
word(s.s, "[");
|
|
print_expr(s, index);
|
|
word(s.s, "]");
|
|
}
|
|
ast::expr_path(path) { print_path(s, path, true); }
|
|
ast::expr_fail(maybe_fail_val) {
|
|
word(s.s, "fail");
|
|
alt maybe_fail_val {
|
|
some(expr) { word(s.s, " "); print_expr(s, expr); }
|
|
_ { }
|
|
}
|
|
}
|
|
ast::expr_break { word(s.s, "break"); }
|
|
ast::expr_cont { word(s.s, "cont"); }
|
|
ast::expr_ret(result) {
|
|
word(s.s, "ret");
|
|
alt result {
|
|
some(expr) { word(s.s, " "); print_expr(s, expr); }
|
|
_ { }
|
|
}
|
|
}
|
|
ast::expr_be(result) { word_nbsp(s, "be"); print_expr(s, result); }
|
|
ast::expr_log(lvl, lexp, expr) {
|
|
alt check lvl {
|
|
1 { word_nbsp(s, "log"); print_expr(s, expr); }
|
|
0 { word_nbsp(s, "log_err"); print_expr(s, expr); }
|
|
2 {
|
|
word_nbsp(s, "log");
|
|
popen(s);
|
|
print_expr(s, lexp);
|
|
word(s.s, ",");
|
|
space_if_not_bol(s);
|
|
print_expr(s, expr);
|
|
pclose(s);
|
|
}
|
|
}
|
|
}
|
|
ast::expr_check(m, expr) {
|
|
alt m {
|
|
ast::claimed_expr { word_nbsp(s, "claim"); }
|
|
ast::checked_expr { word_nbsp(s, "check"); }
|
|
}
|
|
popen(s);
|
|
print_expr(s, expr);
|
|
pclose(s);
|
|
}
|
|
ast::expr_assert(expr) {
|
|
word_nbsp(s, "assert");
|
|
print_expr(s, expr);
|
|
}
|
|
ast::expr_new(p, _, v) {
|
|
word_nbsp(s, "new");
|
|
popen(s);
|
|
print_expr(s, p);
|
|
pclose(s);
|
|
print_expr(s, v);
|
|
}
|
|
ast::expr_mac(m) { print_mac(s, m); }
|
|
}
|
|
s.ann.post(ann_node);
|
|
end(s);
|
|
}
|
|
|
|
fn print_expr_parens_if_not_bot(s: ps, ex: @ast::expr) {
|
|
let parens = alt ex.node {
|
|
ast::expr_fail(_) | ast::expr_ret(_) |
|
|
ast::expr_binary(_, _, _) | ast::expr_unary(_, _) |
|
|
ast::expr_move(_, _) | ast::expr_copy(_) |
|
|
ast::expr_assign(_, _) | ast::expr_be(_) |
|
|
ast::expr_assign_op(_, _, _) | ast::expr_swap(_, _) |
|
|
ast::expr_log(_, _, _) | ast::expr_assert(_) |
|
|
ast::expr_call(_, _, true) |
|
|
ast::expr_check(_, _) { true }
|
|
_ { false }
|
|
};
|
|
if parens { popen(s); }
|
|
print_expr(s, ex);
|
|
if parens { pclose(s); }
|
|
}
|
|
|
|
fn print_local_decl(s: ps, loc: @ast::local) {
|
|
print_pat(s, loc.node.pat);
|
|
alt loc.node.ty.node {
|
|
ast::ty_infer { }
|
|
_ { word_space(s, ":"); print_type(s, loc.node.ty); }
|
|
}
|
|
}
|
|
|
|
fn print_decl(s: ps, decl: @ast::decl) {
|
|
maybe_print_comment(s, decl.span.lo);
|
|
alt decl.node {
|
|
ast::decl_local(locs) {
|
|
space_if_not_bol(s);
|
|
ibox(s, indent_unit);
|
|
word_nbsp(s, "let");
|
|
|
|
// if any are mut, all are mut
|
|
if vec::any(locs) {|l| l.node.is_mutbl } {
|
|
assert vec::all(locs) {|l| l.node.is_mutbl };
|
|
word_nbsp(s, "mut");
|
|
}
|
|
|
|
fn print_local(s: ps, &&loc: @ast::local) {
|
|
ibox(s, indent_unit);
|
|
print_local_decl(s, loc);
|
|
end(s);
|
|
alt loc.node.init {
|
|
some(init) {
|
|
nbsp(s);
|
|
alt init.op {
|
|
ast::init_assign { word_space(s, "="); }
|
|
ast::init_move { word_space(s, "<-"); }
|
|
}
|
|
print_expr(s, init.expr);
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
commasep(s, consistent, locs, print_local);
|
|
end(s);
|
|
}
|
|
ast::decl_item(item) { print_item(s, item); }
|
|
}
|
|
}
|
|
|
|
fn print_ident(s: ps, ident: ast::ident) { word(s.s, ident); }
|
|
|
|
fn print_for_decl(s: ps, loc: @ast::local, coll: @ast::expr) {
|
|
print_local_decl(s, loc);
|
|
space(s.s);
|
|
word_space(s, "in");
|
|
print_expr(s, coll);
|
|
}
|
|
|
|
fn print_path(s: ps, &&path: @ast::path, colons_before_params: bool) {
|
|
maybe_print_comment(s, path.span.lo);
|
|
if path.global { word(s.s, "::"); }
|
|
let mut first = true;
|
|
for path.idents.each {|id|
|
|
if first { first = false; } else { word(s.s, "::"); }
|
|
word(s.s, id);
|
|
}
|
|
if path.rp.is_some() || !path.types.is_empty() {
|
|
if colons_before_params { word(s.s, "::"); }
|
|
|
|
alt path.rp {
|
|
none { /* ok */ }
|
|
some(r) {
|
|
word(s.s, "/");
|
|
print_region(s, r);
|
|
}
|
|
}
|
|
|
|
if !path.types.is_empty() {
|
|
word(s.s, "<");
|
|
commasep(s, inconsistent, path.types, print_type);
|
|
word(s.s, ">");
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_pat(s: ps, &&pat: @ast::pat) {
|
|
maybe_print_comment(s, pat.span.lo);
|
|
let ann_node = node_pat(s, pat);
|
|
s.ann.pre(ann_node);
|
|
/* Pat isn't normalized, but the beauty of it
|
|
is that it doesn't matter */
|
|
alt pat.node {
|
|
ast::pat_wild { word(s.s, "_"); }
|
|
ast::pat_ident(path, sub) {
|
|
print_path(s, path, true);
|
|
alt sub {
|
|
some(p) { word(s.s, "@"); print_pat(s, p); }
|
|
none {}
|
|
}
|
|
}
|
|
ast::pat_enum(path, args_) {
|
|
print_path(s, path, true);
|
|
alt args_ {
|
|
none { word(s.s, "(*)"); }
|
|
some(args) {
|
|
if vec::len(args) > 0u {
|
|
popen(s);
|
|
commasep(s, inconsistent, args, print_pat);
|
|
pclose(s);
|
|
} else { }
|
|
}
|
|
}
|
|
}
|
|
ast::pat_rec(fields, etc) {
|
|
word(s.s, "{");
|
|
fn print_field(s: ps, f: ast::field_pat) {
|
|
cbox(s, indent_unit);
|
|
word(s.s, f.ident);
|
|
word_space(s, ":");
|
|
print_pat(s, f.pat);
|
|
end(s);
|
|
}
|
|
fn get_span(f: ast::field_pat) -> codemap::span { ret f.pat.span; }
|
|
commasep_cmnt(s, consistent, fields, print_field, get_span);
|
|
if etc {
|
|
if vec::len(fields) != 0u { word_space(s, ","); }
|
|
word(s.s, "_");
|
|
}
|
|
word(s.s, "}");
|
|
}
|
|
ast::pat_tup(elts) {
|
|
popen(s);
|
|
commasep(s, inconsistent, elts, print_pat);
|
|
pclose(s);
|
|
}
|
|
ast::pat_box(inner) { word(s.s, "@"); print_pat(s, inner); }
|
|
ast::pat_uniq(inner) { word(s.s, "~"); print_pat(s, inner); }
|
|
ast::pat_lit(e) { print_expr(s, e); }
|
|
ast::pat_range(begin, end) {
|
|
print_expr(s, begin);
|
|
space(s.s);
|
|
word_space(s, "to");
|
|
print_expr(s, end);
|
|
}
|
|
}
|
|
s.ann.post(ann_node);
|
|
}
|
|
|
|
fn print_fn(s: ps, decl: ast::fn_decl, name: ast::ident,
|
|
typarams: [ast::ty_param]) {
|
|
alt decl.purity {
|
|
ast::impure_fn { head(s, "fn"); }
|
|
ast::unsafe_fn { head(s, "unsafe fn"); }
|
|
ast::pure_fn { head(s, "pure fn"); }
|
|
ast::crust_fn { head(s, "crust fn"); }
|
|
}
|
|
word(s.s, name);
|
|
print_type_params(s, typarams);
|
|
print_fn_args_and_ret(s, decl);
|
|
}
|
|
|
|
fn print_cap_clause(s: ps, cap_clause: ast::capture_clause) {
|
|
fn print_cap_item(s: ps, &&cap_item: @ast::capture_item) {
|
|
word(s.s, cap_item.name);
|
|
}
|
|
|
|
let has_copies = vec::is_not_empty(cap_clause.copies);
|
|
let has_moves = vec::is_not_empty(cap_clause.moves);
|
|
if !has_copies && !has_moves { ret; }
|
|
|
|
word(s.s, "[");
|
|
|
|
if has_copies {
|
|
word_nbsp(s, "copy");
|
|
commasep(s, inconsistent, cap_clause.copies, print_cap_item);
|
|
if has_moves {
|
|
word_space(s, ";");
|
|
}
|
|
}
|
|
|
|
if has_moves {
|
|
word_nbsp(s, "move");
|
|
commasep(s, inconsistent, cap_clause.moves, print_cap_item);
|
|
}
|
|
|
|
word(s.s, "]");
|
|
}
|
|
|
|
fn print_fn_args_and_ret(s: ps, decl: ast::fn_decl) {
|
|
popen(s);
|
|
commasep(s, inconsistent, decl.inputs, print_arg);
|
|
pclose(s);
|
|
word(s.s, constrs_str(decl.constraints, {|c|
|
|
ast_fn_constr_to_str(decl, c)
|
|
}));
|
|
|
|
maybe_print_comment(s, decl.output.span.lo);
|
|
if decl.output.node != ast::ty_nil {
|
|
space_if_not_bol(s);
|
|
word_space(s, "->");
|
|
print_type(s, decl.output);
|
|
}
|
|
}
|
|
|
|
fn print_fn_block_args(s: ps, decl: ast::fn_decl) {
|
|
word(s.s, "|");
|
|
commasep(s, inconsistent, decl.inputs, print_arg);
|
|
word(s.s, "|");
|
|
if decl.output.node != ast::ty_infer {
|
|
space_if_not_bol(s);
|
|
word_space(s, "->");
|
|
print_type(s, decl.output);
|
|
}
|
|
maybe_print_comment(s, decl.output.span.lo);
|
|
}
|
|
|
|
fn mode_to_str(m: ast::mode) -> str {
|
|
alt m {
|
|
ast::expl(ast::by_mutbl_ref) { "&" }
|
|
ast::expl(ast::by_move) { "-" }
|
|
ast::expl(ast::by_ref) { "&&" }
|
|
ast::expl(ast::by_val) { "++" }
|
|
ast::expl(ast::by_copy) { "+" }
|
|
ast::infer(_) { "" }
|
|
}
|
|
}
|
|
|
|
fn print_arg_mode(s: ps, m: ast::mode) {
|
|
let ms = mode_to_str(m);
|
|
if ms != "" { word(s.s, ms); }
|
|
}
|
|
|
|
fn print_bounds(s: ps, bounds: @[ast::ty_param_bound]) {
|
|
if vec::len(*bounds) > 0u {
|
|
word(s.s, ":");
|
|
for vec::each(*bounds) {|bound|
|
|
nbsp(s);
|
|
alt bound {
|
|
ast::bound_copy { word(s.s, "copy"); }
|
|
ast::bound_send { word(s.s, "send"); }
|
|
ast::bound_iface(t) { print_type(s, t); }
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_region_param(s: ps, rp: ast::region_param) {
|
|
alt rp {
|
|
ast::rp_self { word(s.s, "/&") }
|
|
ast::rp_none { }
|
|
}
|
|
}
|
|
|
|
fn print_type_params(s: ps, &¶ms: [ast::ty_param]) {
|
|
if vec::len(params) > 0u {
|
|
word(s.s, "<");
|
|
fn printParam(s: ps, param: ast::ty_param) {
|
|
word(s.s, param.ident);
|
|
print_bounds(s, param.bounds);
|
|
}
|
|
commasep(s, inconsistent, params, printParam);
|
|
word(s.s, ">");
|
|
}
|
|
}
|
|
|
|
fn print_meta_item(s: ps, &&item: @ast::meta_item) {
|
|
ibox(s, indent_unit);
|
|
alt item.node {
|
|
ast::meta_word(name) { word(s.s, name); }
|
|
ast::meta_name_value(name, value) {
|
|
word_space(s, name);
|
|
word_space(s, "=");
|
|
print_literal(s, @value);
|
|
}
|
|
ast::meta_list(name, items) {
|
|
word(s.s, name);
|
|
popen(s);
|
|
commasep(s, consistent, items, print_meta_item);
|
|
pclose(s);
|
|
}
|
|
}
|
|
end(s);
|
|
}
|
|
|
|
fn print_view_path(s: ps, &&vp: @ast::view_path) {
|
|
alt vp.node {
|
|
ast::view_path_simple(ident, path, _) {
|
|
if path.idents[vec::len(path.idents)-1u] != ident {
|
|
word_space(s, ident);
|
|
word_space(s, "=");
|
|
}
|
|
print_path(s, path, false);
|
|
}
|
|
|
|
ast::view_path_glob(path, _) {
|
|
print_path(s, path, false);
|
|
word(s.s, "::*");
|
|
}
|
|
|
|
ast::view_path_list(path, idents, _) {
|
|
print_path(s, path, false);
|
|
word(s.s, "::{");
|
|
commasep(s, inconsistent, idents) {|s, w|
|
|
word(s.s, w.node.name)
|
|
}
|
|
word(s.s, "}");
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_view_paths(s: ps, vps: [@ast::view_path]) {
|
|
commasep(s, inconsistent, vps, print_view_path);
|
|
}
|
|
|
|
fn print_view_item(s: ps, item: @ast::view_item) {
|
|
hardbreak_if_not_bol(s);
|
|
maybe_print_comment(s, item.span.lo);
|
|
alt item.node {
|
|
ast::view_item_use(id, mta, _) {
|
|
head(s, "use");
|
|
word(s.s, id);
|
|
if vec::len(mta) > 0u {
|
|
popen(s);
|
|
commasep(s, consistent, mta, print_meta_item);
|
|
pclose(s);
|
|
}
|
|
}
|
|
|
|
ast::view_item_import(vps) {
|
|
head(s, "import");
|
|
print_view_paths(s, vps);
|
|
}
|
|
|
|
ast::view_item_export(vps) {
|
|
head(s, "export");
|
|
print_view_paths(s, vps);
|
|
}
|
|
}
|
|
word(s.s, ";");
|
|
end(s); // end inner head-block
|
|
end(s); // end outer head-block
|
|
}
|
|
|
|
fn print_op_maybe_parens(s: ps, expr: @ast::expr, outer_prec: uint) {
|
|
let add_them = need_parens(expr, outer_prec);
|
|
if add_them { popen(s); }
|
|
print_expr(s, expr);
|
|
if add_them { pclose(s); }
|
|
}
|
|
|
|
fn print_mutability(s: ps, mutbl: ast::mutability) {
|
|
alt mutbl {
|
|
ast::m_mutbl { word_nbsp(s, "mut"); }
|
|
ast::m_const { word_nbsp(s, "const"); }
|
|
ast::m_imm {/* nothing */ }
|
|
}
|
|
}
|
|
|
|
fn print_mt(s: ps, mt: ast::mt) {
|
|
print_mutability(s, mt.mutbl);
|
|
print_type(s, mt.ty);
|
|
}
|
|
|
|
fn print_arg(s: ps, input: ast::arg) {
|
|
ibox(s, indent_unit);
|
|
print_arg_mode(s, input.mode);
|
|
alt input.ty.node {
|
|
ast::ty_infer {
|
|
word(s.s, input.ident);
|
|
}
|
|
_ {
|
|
if str::len(input.ident) > 0u {
|
|
word_space(s, input.ident + ":");
|
|
}
|
|
print_type(s, input.ty);
|
|
}
|
|
}
|
|
end(s);
|
|
}
|
|
|
|
fn print_ty_fn(s: ps, opt_proto: option<ast::proto>,
|
|
decl: ast::fn_decl, id: option<ast::ident>,
|
|
tps: option<[ast::ty_param]>) {
|
|
ibox(s, indent_unit);
|
|
word(s.s, opt_proto_to_str(opt_proto));
|
|
alt id { some(id) { word(s.s, " "); word(s.s, id); } _ { } }
|
|
alt tps { some(tps) { print_type_params(s, tps); } _ { } }
|
|
zerobreak(s.s);
|
|
popen(s);
|
|
commasep(s, inconsistent, decl.inputs, print_arg);
|
|
pclose(s);
|
|
maybe_print_comment(s, decl.output.span.lo);
|
|
if decl.output.node != ast::ty_nil {
|
|
space_if_not_bol(s);
|
|
ibox(s, indent_unit);
|
|
word_space(s, "->");
|
|
if decl.cf == ast::noreturn { word_nbsp(s, "!"); }
|
|
else { print_type(s, decl.output); }
|
|
end(s);
|
|
}
|
|
word(s.s, constrs_str(decl.constraints, ast_ty_fn_constr_to_str));
|
|
end(s);
|
|
}
|
|
|
|
fn maybe_print_trailing_comment(s: ps, span: codemap::span,
|
|
next_pos: option<uint>) {
|
|
let mut cm;
|
|
alt s.cm { some(ccm) { cm = ccm; } _ { ret; } }
|
|
alt next_comment(s) {
|
|
some(cmnt) {
|
|
if cmnt.style != comments::trailing { ret; }
|
|
let span_line = codemap::lookup_char_pos(cm, span.hi);
|
|
let comment_line = codemap::lookup_char_pos(cm, cmnt.pos);
|
|
let mut next = cmnt.pos + 1u;
|
|
alt next_pos { none { } some(p) { next = p; } }
|
|
if span.hi < cmnt.pos && cmnt.pos < next &&
|
|
span_line.line == comment_line.line {
|
|
print_comment(s, cmnt);
|
|
s.cur_cmnt += 1u;
|
|
}
|
|
}
|
|
_ { }
|
|
}
|
|
}
|
|
|
|
fn print_remaining_comments(s: ps) {
|
|
// If there aren't any remaining comments, then we need to manually
|
|
// make sure there is a line break at the end.
|
|
if option::is_none(next_comment(s)) { hardbreak(s.s); }
|
|
loop {
|
|
alt next_comment(s) {
|
|
some(cmnt) { print_comment(s, cmnt); s.cur_cmnt += 1u; }
|
|
_ { break; }
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_literal(s: ps, &&lit: @ast::lit) {
|
|
maybe_print_comment(s, lit.span.lo);
|
|
alt next_lit(s, lit.span.lo) {
|
|
some(lt) {
|
|
word(s.s, lt.lit);
|
|
ret;
|
|
}
|
|
_ {}
|
|
}
|
|
alt lit.node {
|
|
ast::lit_str(st) { print_string(s, st); }
|
|
ast::lit_int(ch, ast::ty_char) {
|
|
word(s.s, "'" + escape_str(str::from_char(ch as char), '\'') + "'");
|
|
}
|
|
ast::lit_int(i, t) {
|
|
if i < 0_i64 {
|
|
word(s.s,
|
|
"-" + u64::to_str(-i as u64, 10u)
|
|
+ ast_util::int_ty_to_str(t));
|
|
} else {
|
|
word(s.s,
|
|
u64::to_str(i as u64, 10u)
|
|
+ ast_util::int_ty_to_str(t));
|
|
}
|
|
}
|
|
ast::lit_uint(u, t) {
|
|
word(s.s,
|
|
u64::to_str(u, 10u)
|
|
+ ast_util::uint_ty_to_str(t));
|
|
}
|
|
ast::lit_float(f, t) {
|
|
word(s.s, f + ast_util::float_ty_to_str(t));
|
|
}
|
|
ast::lit_nil { word(s.s, "()"); }
|
|
ast::lit_bool(val) {
|
|
if val { word(s.s, "true"); } else { word(s.s, "false"); }
|
|
}
|
|
}
|
|
}
|
|
|
|
fn lit_to_str(l: @ast::lit) -> str { be to_str(l, print_literal); }
|
|
|
|
fn next_lit(s: ps, pos: uint) -> option<comments::lit> {
|
|
alt s.literals {
|
|
some(lits) {
|
|
while s.cur_lit < vec::len(lits) {
|
|
let lt = lits[s.cur_lit];
|
|
if lt.pos > pos { ret none; }
|
|
s.cur_lit += 1u;
|
|
if lt.pos == pos { ret some(lt); }
|
|
}
|
|
ret none;
|
|
}
|
|
_ { ret none; }
|
|
}
|
|
}
|
|
|
|
fn maybe_print_comment(s: ps, pos: uint) {
|
|
loop {
|
|
alt next_comment(s) {
|
|
some(cmnt) {
|
|
if cmnt.pos < pos {
|
|
print_comment(s, cmnt);
|
|
s.cur_cmnt += 1u;
|
|
} else { break; }
|
|
}
|
|
_ { break; }
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_comment(s: ps, cmnt: comments::cmnt) {
|
|
alt cmnt.style {
|
|
comments::mixed {
|
|
assert (vec::len(cmnt.lines) == 1u);
|
|
zerobreak(s.s);
|
|
word(s.s, cmnt.lines[0]);
|
|
zerobreak(s.s);
|
|
}
|
|
comments::isolated {
|
|
pprust::hardbreak_if_not_bol(s);
|
|
for cmnt.lines.each {|line|
|
|
// Don't print empty lines because they will end up as trailing
|
|
// whitespace
|
|
if str::is_not_empty(line) { word(s.s, line); }
|
|
hardbreak(s.s);
|
|
}
|
|
}
|
|
comments::trailing {
|
|
word(s.s, " ");
|
|
if vec::len(cmnt.lines) == 1u {
|
|
word(s.s, cmnt.lines[0]);
|
|
hardbreak(s.s);
|
|
} else {
|
|
ibox(s, 0u);
|
|
for cmnt.lines.each {|line|
|
|
if str::is_not_empty(line) { word(s.s, line); }
|
|
hardbreak(s.s);
|
|
}
|
|
end(s);
|
|
}
|
|
}
|
|
comments::blank_line {
|
|
// We need to do at least one, possibly two hardbreaks.
|
|
let is_semi =
|
|
alt s.s.last_token() {
|
|
pp::STRING(s, _) { s == ";" }
|
|
_ { false }
|
|
};
|
|
if is_semi || is_begin(s) || is_end(s) { hardbreak(s.s); }
|
|
hardbreak(s.s);
|
|
}
|
|
}
|
|
}
|
|
|
|
fn print_string(s: ps, st: str) {
|
|
word(s.s, "\"");
|
|
word(s.s, escape_str(st, '"'));
|
|
word(s.s, "\"");
|
|
}
|
|
|
|
fn escape_str(st: str, to_escape: char) -> str {
|
|
let mut out: str = "";
|
|
let len = str::len(st);
|
|
let mut i = 0u;
|
|
while i < len {
|
|
alt st[i] as char {
|
|
'\n' { out += "\\n"; }
|
|
'\t' { out += "\\t"; }
|
|
'\r' { out += "\\r"; }
|
|
'\\' { out += "\\\\"; }
|
|
cur {
|
|
if cur == to_escape { out += "\\"; }
|
|
// FIXME some (or all?) non-ascii things should be escaped
|
|
// (See #2306)
|
|
str::push_char(out, cur);
|
|
}
|
|
}
|
|
i += 1u;
|
|
}
|
|
ret out;
|
|
}
|
|
|
|
fn to_str<T>(t: T, f: fn@(ps, T)) -> str {
|
|
let buffer = io::mem_buffer();
|
|
let s = rust_printer(io::mem_buffer_writer(buffer));
|
|
f(s, t);
|
|
eof(s.s);
|
|
io::mem_buffer_str(buffer)
|
|
}
|
|
|
|
fn next_comment(s: ps) -> option<comments::cmnt> {
|
|
alt s.comments {
|
|
some(cmnts) {
|
|
if s.cur_cmnt < vec::len(cmnts) {
|
|
ret some(cmnts[s.cur_cmnt]);
|
|
} else { ret none::<comments::cmnt>; }
|
|
}
|
|
_ { ret none::<comments::cmnt>; }
|
|
}
|
|
}
|
|
|
|
fn constr_args_to_str<T>(f: fn@(T) -> str, args: [@ast::sp_constr_arg<T>]) ->
|
|
str {
|
|
let mut comma = false;
|
|
let mut s = "(";
|
|
for args.each {|a|
|
|
if comma { s += ", "; } else { comma = true; }
|
|
s += constr_arg_to_str::<T>(f, a.node);
|
|
}
|
|
s += ")";
|
|
ret s;
|
|
}
|
|
|
|
fn constr_arg_to_str<T>(f: fn@(T) -> str, c: ast::constr_arg_general_<T>) ->
|
|
str {
|
|
alt c {
|
|
ast::carg_base { ret "*"; }
|
|
ast::carg_ident(i) { ret f(i); }
|
|
ast::carg_lit(l) { ret lit_to_str(l); }
|
|
}
|
|
}
|
|
|
|
// needed b/c constr_args_to_str needs
|
|
// something that takes an alias
|
|
// (argh)
|
|
fn uint_to_str(&&i: uint) -> str { ret uint::str(i); }
|
|
|
|
fn ast_ty_fn_constr_to_str(&&c: @ast::constr) -> str {
|
|
ret path_to_str(c.node.path) +
|
|
constr_args_to_str(uint_to_str, c.node.args);
|
|
}
|
|
|
|
fn ast_fn_constr_to_str(decl: ast::fn_decl, &&c: @ast::constr) -> str {
|
|
let arg_to_str = bind fn_arg_idx_to_str(decl, _);
|
|
ret path_to_str(c.node.path) +
|
|
constr_args_to_str(arg_to_str, c.node.args);
|
|
}
|
|
|
|
fn ty_constr_to_str(&&c: @ast::ty_constr) -> str {
|
|
fn ty_constr_path_to_str(&&p: @ast::path) -> str { "*." + path_to_str(p) }
|
|
|
|
ret path_to_str(c.node.path) +
|
|
constr_args_to_str::<@ast::path>(ty_constr_path_to_str,
|
|
c.node.args);
|
|
}
|
|
|
|
fn constrs_str<T>(constrs: [T], elt: fn(T) -> str) -> str {
|
|
let mut s = "", colon = true;
|
|
for constrs.each {|c|
|
|
if colon { s += " : "; colon = false; } else { s += ", "; }
|
|
s += elt(c);
|
|
}
|
|
ret s;
|
|
}
|
|
|
|
fn fn_arg_idx_to_str(decl: ast::fn_decl, &&idx: uint) -> str {
|
|
decl.inputs[idx].ident
|
|
}
|
|
|
|
fn opt_proto_to_str(opt_p: option<ast::proto>) -> str {
|
|
alt opt_p {
|
|
none { "fn" }
|
|
some(p) { proto_to_str(p) }
|
|
}
|
|
}
|
|
|
|
fn proto_to_str(p: ast::proto) -> str {
|
|
ret alt p {
|
|
ast::proto_bare { "native fn" }
|
|
ast::proto_any { "fn" }
|
|
ast::proto_block { "fn&" }
|
|
ast::proto_uniq { "fn~" }
|
|
ast::proto_box { "fn@" }
|
|
};
|
|
}
|
|
|
|
//
|
|
// Local Variables:
|
|
// mode: rust
|
|
// fill-column: 78;
|
|
// indent-tabs-mode: nil
|
|
// c-basic-offset: 4
|
|
// buffer-file-coding-system: utf-8-unix
|
|
// End:
|
|
//
|