mirror of
https://github.com/carbon-language/carbon-lang.git
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Chandler Carruth
fccb349af4
This is a re-do of #7888 Outside a call, the grammar scoped a name as a type or a variable by its capitalization. A theme could not distinguish a type from a value with the same spelling, or a parameter, a member, or an implemented interface from any other name. Pointer member access `->` was scoped as a result arrow, which scoped `Lookup` in `regions->Lookup(x)` as a type. `entity.name.type` now applies only in a type position (after `:`, `->`, `as`, `adapt`, or `require`, or in an `impl`) and to the name a nominal declaration declares. A qualifier, in a declared name like `fn N.Base(T: type).F()` or in a type, is `entity.name.scope-resolution` nested in `entity.name.type`. As in the parser, a name is a qualifier when its parameter lists are followed by `.`. Parameters, `let` bindings, choice alternatives, members, implemented interfaces, primitive types, `import`, and the strings naming a builtin or a library have their own scopes, and brackets use the C++ grammar's scopes. A `->` written directly after its operand is member access; no result arrow in the repository is written that way. The sample palette renders each scope that depends on context differently, and `tmlanguage.py` now supports nested captures. In 17 of the 19 themes measured, the VS Code built-ins plus One Dark Pro, Night Owl, Tokyo Night, and Nord, 13% to 27% of the characters in hand-written Carbon change color or style. A theme loses a color where `.` is now punctuation, where word operators like `as` are no longer control-flow keywords, or where a name outside a type position is no longer a type. Assisted-by: Claude Code
68 lines
1.2 KiB
Plaintext
68 lines
1.2 KiB
Plaintext
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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fn F;
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fn F1();
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fn Func(a: i32, b: A);
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fn Generic[T: type, U: I](a: T, b: U) -> U;
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fn Lambda(a: i32) -> i32 => return a + 5;
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fn
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MultiLine[
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A: type,
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B: C1,
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C: C2
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](a: A(B, C),
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b: B,
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c: i32);
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fn Invalid#+?Name();
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x.(I.F)();
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a: A;
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a: A = (b as A);
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a: i32;
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a: array(A, 5);
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generic a: type;
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generic a: T = b;
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a: A in some_list;
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var a: T;
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let b: T;
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let unused c: T = d;
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binding: T;
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generic binding: T;
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var
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multiline: T;
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fn F(ref a: A, const ref b: B);
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fn F() -> T;
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fn F() -> T.U { return val; }
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fn F() -> i32 => return val;
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// --- lambdas and positional parameters
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var explicit: auto = fn (x: i32) -> i32 { return x + 1; };
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var expression: auto = fn (x: i32) => x + 1;
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var positional: auto = fn { Print($0, $1, $42); };
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// --- raw identifiers
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r#class
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r#if
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r#i32
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var r#var: i32 = r#class;
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// --- member access through a pointer
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p->field;
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p->Method(a);
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p->0;
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(*p).field;
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t.0.1;
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q.value()->size();
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// --- builtin function definitions
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fn Add(a: i32, b: i32) -> i32 = "int.sadd";
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fn Bits(n: IntLiteral) -> type = "int.make_type_signed";
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