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Initial import: the house-style lint rules as a crafter-build module

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Moved out of Crafter.Build's lint-rules.h so a project.cpp pulls them in
with `#pragma crafter dependency` + `import Crafter.LintRules;` instead of
copying a header. The rule bodies are unchanged; format-concat now sits
with the other transforms (it rewrites, it was registered as a report),
and the helpers are module-internal. tests/HouseRules moved along with
the rules and links crafter-build from git, or the sibling checkout with
--local.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
This commit is contained in:
Jorijn van der Graaf 2026-10-02 19:57:28 +02:00
commit 88139fc0fc
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
7 changed files with 2436 additions and 0 deletions
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Nothing in this License shall be construed as excluding or limiting
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12. No Surrender of Others' Freedom.
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If the Program specifies that a proxy can decide which future
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Later license versions may give you additional or different
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How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
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it under the terms of the GNU General Public License as published by
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(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Crafter.LintRules
The Catcrafts house-style lint rules for [crafter-build](https://forgejo.catcrafts.net/Catcrafts/Crafter.Build), packaged as one C++ module. Naming conventions, K&R braces, `enum class`, `std::println` over iostream, fixed-width integer types, `std::format` over concatenation, line wrapping, whitespace hygiene and a few AST-backed checks (`const` locals, `constexpr` constants, no `char*`). Most rules are transforms, so `crafter-build format` applies them.
## Use
In a `project.cpp`:
```cpp
import std;
import Crafter.Build;
#pragma crafter dependency "https://forgejo.catcrafts.net/Catcrafts/Crafter.LintRules.git"
import Crafter.LintRules;
using namespace Crafter;
extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
Configuration cfg;
// ...
LintRules::AddRules(cfg);
return cfg;
}
```
Then `crafter-build lint` reports, `crafter-build format` rewrites, and `crafter-build format --check` gates CI. Pin a revision for reproducible builds:
```cpp
#pragma crafter dependency "https://forgejo.catcrafts.net/Catcrafts/Crafter.LintRules.git" commit "<sha>"
```
Suppress a finding with `// lint-disable-next-line <rule>` or a whole file with `// lint-disable-file <rule>`.
## Rules
| Rule | Kind | What it wants |
| --- | --- | --- |
| `spdx-header` | report | `// SPDX-License-Identifier:` on line 1, `// SPDX-FileCopyrightText:` on line 2, blank line 3 |
| `no-tabs` | report | spaces |
| `naming` | report, AST | PascalCase types, functions, statics and constants; camelCase variables |
| `enum-class` | report | `enum class`, never a plain `enum` |
| `no-iostream-print` | report | `std::println` instead of `std::cout`/`std::cerr` streaming |
| `no-char-pointer` | report, AST | `std::string` / `std::string_view` over `char*` outside C interop |
| `const-local` | report, AST | `const` on a scalar local that is never written |
| `constexpr-constant` | report, AST | `constexpr` on a constant with a constant initialiser |
| `format-concat` | transform | `std::format` instead of `+` with string literals |
| `fixed-width-types` | transform, AST | `std::int32_t` and friends instead of `int`, `long`, … |
| `single-declaration` | transform, AST | one declaration per statement |
| `brace-style` | transform | K&R braces |
| `if-single-line` | transform | `if (x) return;` on one line when it fits |
| `wrap-join` | transform | join wrapped statements that fit on one line |
| `paren-spacing` | transform | `if (` and `for (`, no space before a call's `(` |
| `trim-trailing-ws` | transform | no trailing whitespace |
| `final-newline` | transform | files end with a newline |
## Tests
`tests/HouseRules` exercises every rule against small inputs. It links crafter-build to run the linter in-process, so it fetches and builds it from git; with a sibling checkout at `../Crafter.Build` use `crafter-build test --local`.
## Building for other targets
The module imports `Crafter.Build`, which only exists for the host. That is all a rule ever needs: rules run inside the crafter-build process that loads your `project.cpp`.

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// SPDX-License-Identifier: LGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
export module Crafter.LintRules;
import std;
import Crafter.Build;
// The Catcrafts house-style lint rules, as a module for crafter-build. In a
// project.cpp:
//
// #pragma crafter dependency "https://forgejo.catcrafts.net/Catcrafts/Crafter.LintRules.git"
// import Crafter.LintRules;
// ...
// LintRules::AddRules(cfg);
//
// Deliberately not part of the crafter-build library, so the tool itself
// never nudges anyone toward one team's style.
//
// Report-only rules are registered first so their file:line numbers always
// match the on-disk file; transforms run last because each one sees the
// previous transform's output, which can shift line numbers.
//
// All detection runs on ctx.CommentStripped() — comments and string/char
// literal bodies are blanked to spaces with newlines preserved, so byte
// offsets and line numbers in the stripped text are valid in ctx.content.
// Transforms use that property directly: find in stripped, edit in content.
namespace Crafter::LintRules {
bool IsCppFile(const Crafter::LintContext& ctx) {
std::string ext = ctx.file.extension().string();
return ext == ".cpp" || ext == ".cppm" || ext == ".h";
}
std::vector<std::string_view> Lines(std::string_view text) {
std::vector<std::string_view> lines;
std::size_t start = 0;
while (start <= text.size()) {
std::size_t end = text.find('\n', start);
if (end == std::string_view::npos) {
if (start < text.size()) lines.push_back(text.substr(start));
break;
}
lines.push_back(text.substr(start, end - start));
start = end + 1;
}
return lines;
}
std::string_view Trim(std::string_view s) {
while (!s.empty() && (s.front() == ' ' || s.front() == '\t' || s.front() == '\r')) s.remove_prefix(1);
while (!s.empty() && (s.back() == ' ' || s.back() == '\t' || s.back() == '\r')) s.remove_suffix(1);
return s;
}
bool IsWordChar(char c) {
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9') || c == '_';
}
// Net '(' minus ')' on one stripped line.
std::int64_t ParenDelta(std::string_view s) {
std::int64_t d = 0;
for (char c : s) {
if (c == '(') ++d;
if (c == ')') --d;
}
return d;
}
bool IsPascalCase(std::string_view name) {
return !name.empty() && name[0] >= 'A' && name[0] <= 'Z' && !name.contains('_');
}
bool IsCamelCase(std::string_view name) {
// One trailing underscore is the member-shadowing-a-keyword convention
// (requires_, label_) — allowed.
if (name.ends_with('_')) name.remove_suffix(1);
return !name.empty() && ((name[0] >= 'a' && name[0] <= 'z') || name[0] == '_') && name.find('_', 1) == std::string_view::npos;
}
// clang spells a pointer type "int *"; house style attaches the star to the
// type. Only affects spelling, never which type is meant.
std::string NormalisePointerSpelling(std::string_view type) {
std::string out;
out.reserve(type.size());
for (char c : type) {
if ((c == '*' || c == '&') && out.ends_with(' ')) out.pop_back();
out += c;
}
return out;
}
// True for a pointer to char, as clang spells a type: "char *",
// "const char *", "char **". Deliberately not signed/unsigned char, which are
// byte buffers rather than text and were never the target.
bool IsCharPointer(std::string_view type) {
std::size_t star = type.find('*');
if (star == std::string_view::npos) return false;
std::string_view base = Trim(type.substr(0, star));
if (base.starts_with("const ")) base.remove_prefix(6);
if (base.starts_with("volatile ")) base.remove_prefix(9);
return base == "char";
}
}
export namespace Crafter::LintRules {
void AddRules(Crafter::Configuration& cfg) {
using Crafter::LintContext;
// ---------------- report-only rules ----------------
// License header: SPDX identifier on line 1, copyright on line 2, blank
// line 3.
cfg.AddLintRule("spdx-header", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
if (!ctx.Line(1).starts_with("// SPDX-License-Identifier:")) {
ctx.Report(1, "first line must be // SPDX-License-Identifier: ...");
}
if (!ctx.Line(2).starts_with("// SPDX-FileCopyrightText:")) {
ctx.Report(2, "second line must be // SPDX-FileCopyrightText: ...");
}
if (ctx.lines.size() >= 3 && !Trim(ctx.Line(3)).empty()) {
ctx.Report(3, "third line must be blank (separates the license header)");
}
});
cfg.AddLintRule("no-tabs", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
for (std::size_t n = 1; n <= ctx.lines.size(); ++n) {
if (ctx.Line(n).contains('\t')) ctx.Report(n, "tab character (use spaces)");
}
});
// Naming: types and functions PascalCase, variables camelCase, with
// statics, namespace-scope globals and constexpr constants PascalCase.
//
// Reads the AST. The previous version needed four std::regex, a hand-rolled
// {/} scope stack, a cumulative paren-depth counter to avoid mistaking a
// wrapped parameter list for a declaration, a keyword denylist, and a
// "function-shaped line" guess whose own comment conceded it was heuristic.
// All of it existed to answer two questions clang answers directly: what
// kind of declaration is this, and what encloses it.
cfg.AddAstLintRule("naming", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
using Kind = Crafter::LintDeclKind;
std::span<const Crafter::LintDecl> decls = ctx.Decls();
for (const Crafter::LintDecl& decl : decls) {
if (decl.name.empty()) continue; // anonymous namespace, unnamed struct
// A declaration with C language linkage is named by the C library
// it mirrors — `extern "C" int setenv(...)` is not ours to rename.
if (decl.isExternC) continue;
// Namespace scope is now a lookup rather than a brace count, and it
// is exact for a local declared inside a function body.
bool atNamespaceScope = decl.parent == Crafter::LintNoParent
|| decls[decl.parent].kind == Kind::Namespace;
switch (decl.kind) {
case Kind::Class:
case Kind::Struct:
case Kind::Union:
case Kind::Enum:
if (!IsPascalCase(decl.name)) {
ctx.Report(decl.line, std::format("type '{}' should be PascalCase", decl.name));
}
break;
case Kind::TypeAlias:
if (!IsPascalCase(decl.name)) {
ctx.Report(decl.line, std::format("type alias '{}' should be PascalCase", decl.name));
}
break;
case Kind::Function:
case Kind::Method:
// main is spelled by the language; operators by their
// symbol. Constructors and destructors take their type's
// name and are separate kinds, so they never arrive here.
if (decl.name == "main" || decl.name.starts_with("operator")) break;
if (!IsPascalCase(decl.name)) {
ctx.Report(decl.line, std::format("function '{}' should be PascalCase", decl.name));
}
break;
case Kind::Variable:
// constexpr variables are compile-time constants and take
// constant naming, like statics and globals.
if (decl.isStatic || decl.isConstexpr || atNamespaceScope) {
if (!IsPascalCase(decl.name)) {
ctx.Report(decl.line, std::format("{} '{}' should be PascalCase",
decl.isStatic ? "static variable"
: decl.isConstexpr ? "constexpr constant"
: "global variable", decl.name));
}
} else if (!IsCamelCase(decl.name)) {
ctx.Report(decl.line, std::format("variable '{}' should be camelCase", decl.name));
}
break;
case Kind::Field:
if (decl.isStatic || decl.isConstexpr) {
if (!IsPascalCase(decl.name)) {
ctx.Report(decl.line, std::format("static member '{}' should be PascalCase", decl.name));
}
} else if (!IsCamelCase(decl.name)) {
ctx.Report(decl.line, std::format("member '{}' should be camelCase", decl.name));
}
break;
default:
break;
}
}
});
// Scoped enums only. Kept on tokens rather than moved to the AST, even
// though LintDecl carries an exact isScopedEnum: an AST is one
// configuration's slice, so a plain enum inside a preprocessor branch that
// is inactive for the host would stop being reported. Tokens are lexed
// without evaluating #if, so every platform's code stays covered.
cfg.AddLintRule("enum-class", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::span<const Crafter::LintToken> tokens = ctx.Tokens();
for (std::size_t i = 0; i < tokens.size(); ++i) {
if (tokens[i].kind != Crafter::LintTokenKind::Keyword) continue;
if (ctx.TokenText(tokens[i]) != "enum") continue;
// Asking for the next TOKEN rather than the rest of the line means a
// declaration split across lines reads identically to one that is
// not — the regex this replaced required the name to follow `enum`
// on the same line, so `enum\n Color {` went unreported.
std::string_view next = i + 1 < tokens.size() ? ctx.TokenText(tokens[i + 1]) : std::string_view{};
if (next == "class" || next == "struct") continue;
ctx.Report(tokens[i].line, "use enum class instead of plain enum");
}
});
cfg.AddLintRule("no-iostream-print", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::vector<std::string_view> lines = Lines(ctx.CommentStripped());
for (std::size_t i = 0; i < lines.size(); ++i) {
if (lines[i].contains("std::cout")) {
ctx.Report(i + 1, "use std::println instead of std::cout");
} else if (lines[i].contains("std::cerr") && lines[i].contains("<<")) {
ctx.Report(i + 1, "use std::println(std::cerr, ...) instead of streaming to std::cerr");
}
}
});
// Prefer std::string / std::string_view over char* in our own declarations.
//
// Reads the AST rather than the text, which retires the substring denylist
// this rule used to carry (argv, getenv, setenv, dlerror, c_str, .data(,
// reinterpret_cast, extern "). Every entry was a patch for one interop
// site, the list could only grow, and it disabled the rule for a whole LINE
// whenever one appeared. The question is now asked directly: whose header
// dictates this spelling? A declaration with C language linkage, or one
// that binds to an entity declared outside the project, is somebody else's
// API and keeps its spelling.
//
// Only declarations are considered. A char* inside a cast or an expression
// is not an interface, and reinterpret_cast<char*> for binary IO — the case
// the denylist existed to permit — is no longer a finding to suppress.
cfg.AddAstLintRule("no-char-pointer", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::span<const Crafter::LintDecl> decls = ctx.Decls();
for (const Crafter::LintDecl& decl : decls) {
// main's signature is fixed by the language, so its argv is no more
// ours to modernise than a C API's is.
if (decl.parent != Crafter::LintNoParent && decls[decl.parent].name == "main") continue;
if (decl.kind == Crafter::LintDeclKind::Function && decl.name == "main") continue;
switch (decl.kind) {
case Crafter::LintDeclKind::Variable:
case Crafter::LintDeclKind::Parameter:
case Crafter::LintDeclKind::Field:
case Crafter::LintDeclKind::TypeAlias:
case Crafter::LintDeclKind::Function:
case Crafter::LintDeclKind::Method:
break;
default:
continue;
}
if (decl.isExternC || decl.isForeignApi) continue;
if (!IsCharPointer(decl.type)) continue;
ctx.Report(decl.line, std::format("prefer std::string / std::string_view over char* ('{}' is '{}')", decl.name, decl.type));
}
});
// A local that is never written should say so. Restricted to SCALARS —
// integers, bools, enums, pointers, floating types — which is what makes
// the answer exact rather than a guess: a scalar has no member functions,
// so the only ways to write one are assignment, ++/--, having its address
// taken, or binding to a non-const reference, and the AST layer tracks all
// four. For a class type, a non-const method call could mutate it and
// deciding that needs the whole-program analysis clang-tidy does.
//
// Report-only. Adding const is a judgement about intent as much as
// mechanics, and a wrong suggestion should cost a glance, not a build.
cfg.AddAstLintRule("const-local", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::span<const Crafter::LintDecl> decls = ctx.Decls();
for (const Crafter::LintDecl& decl : decls) {
if (decl.kind != Crafter::LintDeclKind::Variable) continue;
if (decl.parent == Crafter::LintNoParent) continue;
// Locals only: a namespace-scope or static variable may be written
// from a translation unit this parse cannot see.
Crafter::LintDeclKind enclosing = decls[decl.parent].kind;
bool isLocal = enclosing == Crafter::LintDeclKind::Function || enclosing == Crafter::LintDeclKind::Method
|| enclosing == Crafter::LintDeclKind::Constructor || enclosing == Crafter::LintDeclKind::Destructor;
if (!isLocal || decl.isStatic) continue;
if (decl.isConst || decl.isConstexpr) continue;
if (!decl.isScalar || decl.isMutated) continue;
if (decl.name.empty()) continue;
// A range-for binding is not what a reader pictures as an
// assignable variable, and `for (T* const x : …)` is not a spelling
// anybody writes.
if (decl.isLoopVariable) continue;
// Likewise `T* const p` — the useful constness for a pointer local
// is almost always on the pointee, which this rule cannot advise
// on. Restricting to value types keeps the advice actionable.
if (decl.type.contains('*')) continue;
ctx.Report(decl.line, std::format("'{}' is never modified — declare it const", decl.name));
}
});
// A constant whose value is already a constant expression can be constexpr,
// which moves it into the type system instead of leaving it to the
// optimiser. Constant-ness of the initialiser is decided by clang's own
// evaluator, so `sizeof(T)`, a fold over other constants and anything else
// that folds all qualify, while `Compute()` does not.
//
// Restricted to scalars on purpose: for a class type, constexpr may be
// unavailable even when the initialiser folds (a std::string constant
// cannot be constexpr at namespace scope), and the evaluator answering
// "this folds" is not the same question as "constexpr is legal here".
cfg.AddAstLintRule("constexpr-constant", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
for (const Crafter::LintDecl& decl : ctx.Decls()) {
if (decl.kind != Crafter::LintDeclKind::Variable && decl.kind != Crafter::LintDeclKind::Field) continue;
if (!decl.isConst || decl.isConstexpr || !decl.isScalar) continue;
// A pointer's value is an address, which is rarely a constant
// expression and never an interesting one to promote.
if (decl.type.contains('*')) continue;
if (!decl.isConstantInitialised) continue;
if (decl.name.empty()) continue;
ctx.Report(decl.line, std::format("'{}' has a constant initialiser — declare it constexpr", decl.name));
}
});
// ---------------- transforms (auto-fixed by `crafter-build format`) ----------------
// String building via `+` with a literal operand → std::format. Plain
// `a += b` accumulation (builder pattern) stays legal. Single-line chains
// of simple operands (identifier / member / call chains, parenthesized
// groups, literals) are REWRITTEN automatically; anything the operand
// scanner can't prove safe — raw-string lines, ternaries, mixed
// operators, multi-line expressions — is reported for a human instead.
cfg.AddLintRule("format-concat", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
const std::string& code = ctx.CommentStripped();
std::vector<std::string_view> stripped = Lines(code);
// Walk one operand leftwards from `from` (exclusive). Returns the
// operand's begin, or npos when the shape isn't a simple postfix
// chain (then the whole chain bails to a report).
auto operandLeft = [](std::string_view s, std::size_t from) -> std::size_t {
std::size_t i = from;
while (i > 0 && (s[i - 1] == ' ' || s[i - 1] == '\t')) --i;
bool any = false;
for (;;) {
if (i == 0) break;
char c = s[i - 1];
if (c == ')' || c == ']') {
char open = c == ')' ? '(' : '[';
std::size_t depth = 0;
do {
--i;
if (s[i] == c) ++depth;
if (s[i] == open) --depth;
if (depth == 0) break;
} while (i > 0);
if (depth != 0) return std::string_view::npos;
any = true;
// A group directly preceded by an identifier (or another
// group) is a call/index postfix — keep consuming the
// callee: `path.string()` is ONE operand, not `()`.
if (i > 0 && (IsWordChar(s[i - 1]) || s[i - 1] == ')' || s[i - 1] == ']')) continue;
} else if (c == '"') {
--i; // closing quote; interior is blanked, find the opener
while (i > 0 && s[i - 1] != '"') --i;
if (i == 0) return std::string_view::npos;
--i;
any = true;
} else if (IsWordChar(c)) {
while (i > 0 && IsWordChar(s[i - 1])) --i;
any = true;
} else if (c == '.' && any) {
--i;
continue;
} else if (c == ':' && i > 1 && s[i - 2] == ':' && any) {
i -= 2;
continue;
} else if (c == '>' && i > 1 && s[i - 2] == '-' && any) {
i -= 2;
continue;
} else {
break;
}
// After a primary, only connectors continue the operand.
if (i > 0 && (s[i - 1] == '.' || (s[i - 1] == ':' && i > 1 && s[i - 2] == ':')
|| (s[i - 1] == '>' && i > 1 && s[i - 2] == '-'))) continue;
break;
}
if (!any) return std::string_view::npos;
// A unary operator, ternary, or other-precedence operator in
// front means expression structure we don't reason about — bail.
std::size_t b = i;
while (b > 0 && (s[b - 1] == ' ' || s[b - 1] == '\t')) --b;
if (b > 0 && std::string_view("!*&~-?:<>/%^|").contains(s[b - 1])) return std::string_view::npos;
return i;
};
// Walk one operand rightwards from `from` (inclusive). Returns one
// past the operand's end, or npos on bail.
auto operandRight = [](std::string_view s, std::size_t from) -> std::size_t {
std::size_t i = from;
while (i < s.size() && (s[i] == ' ' || s[i] == '\t')) ++i;
bool any = false;
for (;;) {
if (i >= s.size()) break;
char c = s[i];
if (c == '(' || c == '[') {
char close = c == '(' ? ')' : ']';
std::size_t depth = 0;
while (i < s.size()) {
if (s[i] == c) ++depth;
if (s[i] == close && --depth == 0) { ++i; break; }
++i;
}
if (depth != 0) return std::string_view::npos;
any = true;
} else if (c == '"') {
++i;
while (i < s.size() && s[i] != '"') ++i;
if (i >= s.size()) return std::string_view::npos;
++i;
any = true;
} else if (IsWordChar(c)) {
while (i < s.size() && IsWordChar(s[i])) ++i;
any = true;
} else if (any && c == '.') {
++i;
continue;
} else if (any && c == ':' && i + 1 < s.size() && s[i + 1] == ':') {
i += 2;
continue;
} else if (any && c == '-' && i + 1 < s.size() && s[i + 1] == '>') {
i += 2;
continue;
} else {
break;
}
if (i < s.size() && (s[i] == '(' || s[i] == '[' || s[i] == '.'
|| (s[i] == ':' && i + 1 < s.size() && s[i + 1] == ':')
|| (s[i] == '-' && i + 1 < s.size() && s[i + 1] == '>'))) continue;
break;
}
return any ? i : std::string_view::npos;
};
struct Edit { std::size_t begin; std::size_t end; std::string replacement; };
std::vector<Edit> edits; // offsets into ctx.content
std::size_t lineStart = 0;
for (std::size_t li = 0; li < stripped.size(); ++li) {
std::string_view line = stripped[li];
std::size_t lineOff = lineStart;
lineStart += line.size() + 1;
std::string_view trimmed = Trim(line);
if (trimmed.starts_with('#')) continue;
// A chain is read within one line, so a literal that spans lines
// would be sliced in half by chainEnd. Single-line raw strings are
// fine: they reduce to R"…" in the stripped view, so they fail the
// "is a plain literal" test below and travel through as an
// argument, spelling and all.
bool spansLines = ctx.LineHasMultiLineToken(li + 1);
std::size_t searchFrom = 0;
while (searchFrom < line.size()) {
// A candidate `+` that isn't ++ / += and touches a literal.
std::size_t plus = line.find('+', searchFrom);
if (plus == std::string_view::npos) break;
searchFrom = plus + 1;
if (plus + 1 < line.size() && (line[plus + 1] == '+' || line[plus + 1] == '=')) { ++searchFrom; continue; }
if (plus > 0 && line[plus - 1] == '+') continue;
std::size_t leftEnd = plus;
while (leftEnd > 0 && (line[leftEnd - 1] == ' ' || line[leftEnd - 1] == '\t')) --leftEnd;
std::size_t rightBegin = plus + 1;
while (rightBegin < line.size() && (line[rightBegin] == ' ' || line[rightBegin] == '\t')) ++rightBegin;
bool literalAdjacent = (leftEnd > 0 && line[leftEnd - 1] == '"')
|| (rightBegin < line.size() && line[rightBegin] == '"');
if (!literalAdjacent) continue;
if (spansLines) {
ctx.Report(li + 1, "use std::format instead of string concatenation with + (multi-line literal, fix manually)");
break;
}
// Expand to the full chain: operands joined by `+`.
std::size_t chainBegin = operandLeft(line, plus);
std::size_t chainEnd = operandRight(line, plus + 1);
bool bail = chainBegin == std::string_view::npos || chainEnd == std::string_view::npos;
while (!bail) {
std::size_t b = chainBegin;
while (b > 0 && (line[b - 1] == ' ' || line[b - 1] == '\t')) --b;
if (b > 0 && line[b - 1] == '+' && !(b > 1 && line[b - 2] == '+')) {
std::size_t prev = operandLeft(line, b - 1);
if (prev == std::string_view::npos) { bail = true; break; }
chainBegin = prev;
} else break;
}
while (!bail) {
std::size_t e = chainEnd;
while (e < line.size() && (line[e] == ' ' || line[e] == '\t')) ++e;
if (e < line.size() && line[e] == '+' && !(e + 1 < line.size() && (line[e + 1] == '+' || line[e + 1] == '='))) {
std::size_t next = operandRight(line, e + 1);
if (next == std::string_view::npos) { bail = true; break; }
chainEnd = next;
} else break;
}
if (bail) {
ctx.Report(li + 1, "use std::format instead of string concatenation with + (not auto-fixable)");
break;
}
// Split the chain at depth-0 '+' into parts; literals feed the
// format string, everything else becomes an argument.
std::string_view chain = line.substr(chainBegin, chainEnd - chainBegin);
std::string_view rawChain = std::string_view(ctx.content).substr(lineOff + chainBegin, chainEnd - chainBegin);
std::string fmt;
std::vector<std::string_view> args;
std::size_t partBegin = 0;
std::int64_t depth = 0;
bool inLit = false;
for (std::size_t p = 0; p <= chain.size(); ++p) {
if (p < chain.size()) {
char c = chain[p];
if (c == '"') inLit = !inLit;
if (inLit) continue;
if (c == '(' || c == '[') ++depth;
if (c == ')' || c == ']') --depth;
if (!(c == '+' && depth == 0)) continue;
}
std::string_view part = Trim(chain.substr(partBegin, p - partBegin));
std::string_view rawPart = Trim(rawChain.substr(partBegin, p - partBegin));
if (part.starts_with('"') && part.ends_with('"') && part.size() >= 2
&& std::count(part.begin(), part.end(), '"') == 2) {
for (char c : rawPart.substr(1, rawPart.size() - 2)) {
fmt += c;
if (c == '{') fmt += '{';
if (c == '}') fmt += '}';
}
} else if (part.contains('"') && part.contains('+')) {
bail = true; // nested concat inside an operand — human territory
break;
} else {
fmt += "{}";
args.push_back(rawPart);
}
partBegin = p + 1;
}
if (bail || args.empty()) {
ctx.Report(li + 1, "use std::format instead of string concatenation with + (not auto-fixable)");
break;
}
std::string replacement = std::format("std::format(\"{}\"", fmt);
for (std::string_view a : args) replacement += std::format(", {}", a);
replacement += ")";
edits.push_back({lineOff + chainBegin, lineOff + chainEnd, std::move(replacement)});
searchFrom = chainEnd;
}
}
if (edits.empty()) return;
std::string out = ctx.content;
std::sort(edits.begin(), edits.end(), [](const Edit& a, const Edit& b) { return a.begin > b.begin; });
for (const Edit& e : edits) out.replace(e.begin, e.end - e.begin, e.replacement);
ctx.SetContent(std::move(out));
});
// short/int/long → fixed-width types. Lines mentioning main/argc/argv or
// extern "C" keep their C-conventional ints.
cfg.AddAstLintRule("fixed-width-types", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
const std::string& code = ctx.CommentStripped();
struct Rep { std::size_t pos; std::size_t len; std::string to; };
std::vector<Rep> reps;
// Byte ranges whose integer spelling is not ours to change. A wrong
// rewrite here does not merely over-report — it produces code that no
// longer matches the API it is calling — so this is derived from the
// AST rather than from substrings on the line.
//
// Replaces the old per-LINE textual exemption (`int main`, `argc`,
// `argv`, `extern "`), which both missed cases and disabled the rule
// for everything else sharing a line with one of those words.
std::vector<std::pair<std::size_t, std::size_t>> protectedRanges;
for (const Crafter::LintDecl& decl : ctx.Decls()) {
if (decl.isExternC || decl.isForeignApi) {
protectedRanges.emplace_back(decl.begin, decl.end);
continue;
}
// main's signature is fixed by the language. Only the signature:
// its body is ordinary code, and the declaration's extent covers
// the whole function.
if (decl.kind == Crafter::LintDeclKind::Function && decl.name == "main") {
std::size_t bodyBrace = ctx.content.find('{', decl.begin);
protectedRanges.emplace_back(decl.begin, bodyBrace == std::string::npos ? decl.end : bodyBrace);
}
}
auto isProtected = [&protectedRanges](std::size_t offset) {
return std::any_of(protectedRanges.begin(), protectedRanges.end(),
[offset](const std::pair<std::size_t, std::size_t>& range) {
return offset >= range.first && offset < range.second;
});
};
// Builtin integer type specifiers combine in any order (`unsigned
// long`, `long unsigned int`, ...), so match whole RUNS of these
// keywords and classify the run, rather than the words one by one.
static const std::unordered_set<std::string_view> IntWords = {
"unsigned", "signed", "short", "long", "int", "char",
};
std::size_t lineStart = 0;
while (lineStart <= code.size()) {
std::size_t lineEnd = code.find('\n', lineStart);
if (lineEnd == std::string::npos) lineEnd = code.size();
std::string_view line(code.data() + lineStart, lineEnd - lineStart);
std::size_t pos = 0;
while (pos < line.size()) {
if (!IsWordChar(line[pos])) { ++pos; continue; }
std::size_t wordEnd = pos;
while (wordEnd < line.size() && IsWordChar(line[wordEnd])) ++wordEnd;
if (!IntWords.contains(line.substr(pos, wordEnd - pos))) { pos = wordEnd; continue; }
// Extend the run over consecutive specifier keywords.
std::size_t runBegin = pos;
std::size_t runEnd = wordEnd;
bool hasUnsigned = false;
bool hasSigned = false;
bool hasShort = false;
bool hasChar = false;
bool hasLong = false;
std::string_view nextWord;
for (;;) {
std::string_view word = line.substr(pos, wordEnd - pos);
if (word == "unsigned") hasUnsigned = true;
else if (word == "signed") hasSigned = true;
else if (word == "short") hasShort = true;
else if (word == "char") hasChar = true;
else if (word == "long") hasLong = true;
runEnd = wordEnd;
pos = wordEnd;
while (pos < line.size() && (line[pos] == ' ' || line[pos] == '\t')) ++pos;
wordEnd = pos;
while (wordEnd < line.size() && IsWordChar(line[wordEnd])) ++wordEnd;
nextWord = line.substr(pos, wordEnd - pos);
if (!IntWords.contains(nextWord)) break;
}
pos = runEnd;
// Bare `char` is text, not an integer — only signed/unsigned
// char is byte arithmetic. `long double` is a floating type.
if (hasChar && !hasUnsigned && !hasSigned) continue;
if (nextWord == "double") continue;
if (isProtected(lineStart + runBegin)) continue;
std::string_view width = hasChar ? "8" : hasShort ? "16" : hasLong ? "64" : "32";
reps.push_back({lineStart + runBegin, runEnd - runBegin,
std::format("std::{}int{}_t", hasUnsigned ? "u" : "", width)});
}
lineStart = lineEnd + 1;
}
if (reps.empty()) return;
std::string out = ctx.content;
std::sort(reps.begin(), reps.end(), [](const Rep& a, const Rep& b) { return a.pos > b.pos; });
for (const Rep& r : reps) out.replace(r.pos, r.len, r.to);
ctx.SetContent(std::move(out));
});
// One declaration per statement. Auto-splits the simple initialized form
// `Type a = x, b = y;`; anything with pointers/references, parens, or
// templates in the declarators is only reported (splitting `int* a, b;`
// would change b's type).
cfg.AddAstLintRule("single-declaration", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::span<const Crafter::LintDecl> decls = ctx.Decls();
std::span<const Crafter::LintToken> tokens = ctx.Tokens();
struct Edit { std::size_t begin; std::size_t end; std::string text; };
std::vector<Edit> edits;
for (std::size_t i = 0; i < decls.size(); ++i) {
const Crafter::LintDecl& head = decls[i];
if (head.kind != Crafter::LintDeclKind::Variable && head.kind != Crafter::LintDeclKind::Field) continue;
// A group head owns the shared type, so its extent starts before
// its name. Continuation declarators start AT their name.
if (head.begin == head.nameOffset) continue;
std::size_t last = i;
while (last + 1 < decls.size()) {
const Crafter::LintDecl& next = decls[last + 1];
if (next.kind != head.kind || next.parent != head.parent) break;
if (next.begin != next.nameOffset) break; // starts a new statement
++last;
}
if (last == i) continue; // a single declarator: nothing to split
// The statement runs to the ';' after the final declarator.
auto semicolon = std::ranges::find_if(tokens, [&](const Crafter::LintToken& t) {
return t.offset >= decls[last].end && ctx.TokenText(t) == ";";
});
if (semicolon == tokens.end()) continue;
std::size_t stmtEnd = semicolon->offset + 1;
// A comment anywhere inside the statement would be swallowed by the
// rewrite. One AFTER the ';' is outside the replaced range and
// survives, which the line-based version could not manage — it
// refused the whole line.
bool hasInnerComment = std::ranges::any_of(tokens, [&](const Crafter::LintToken& t) {
return t.kind == Crafter::LintTokenKind::Comment && t.offset >= head.begin && t.offset < stmtEnd;
});
if (hasInnerComment) continue;
if (ctx.Suppressed("single-declaration", head.line)) continue;
// Indent from the head's own line, so a statement that starts
// mid-line is left alone rather than reflowed.
std::size_t lineBegin = ctx.content.rfind('\n', head.begin);
lineBegin = lineBegin == std::string::npos ? 0 : lineBegin + 1;
if (!Trim(std::string_view(ctx.content).substr(lineBegin, head.begin - lineBegin)).empty()) continue;
std::string indent(std::string_view(ctx.content).substr(lineBegin, head.begin - lineBegin));
std::string replacement;
for (std::size_t d = i; d <= last; ++d) {
// Each declarator gets its OWN type. This is the whole reason
// this rule needed the AST: copying the head's type prefix
// turns `int* a, b;` into `int* a; int* b;` and silently
// changes b's type. clang has already resolved b as plain int.
std::string type = NormalisePointerSpelling(decls[d].type);
std::string_view declarator = std::string_view(ctx.content).substr(decls[d].nameOffset, decls[d].end - decls[d].nameOffset);
if (d > i) replacement += std::format("\n{}", indent);
// NormalisePointerSpelling already attached the star to the
// type, so the separator is always a single space: `int* a`.
replacement += std::format("{} {};", type, Trim(declarator));
}
edits.push_back({head.begin, stmtEnd, std::move(replacement)});
i = last;
}
if (edits.empty()) return;
std::string out = ctx.content;
std::ranges::sort(edits, [](const Edit& a, const Edit& b) { return a.begin > b.begin; });
for (const Edit& e : edits) out.replace(e.begin, e.end - e.begin, e.text);
ctx.SetContent(std::move(out));
});
// K&R braces: `{` on its own line after a `)`/else/do/try header joins
// onto the header line. Standalone scope blocks (previous line ends with
// `;`, `{`, a comment, …) are intentional and stay.
cfg.AddLintRule("brace-style", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::vector<std::string_view> stripped = Lines(ctx.CommentStripped());
std::vector<std::string> outLines;
outLines.reserve(ctx.lines.size());
bool changed = false;
for (std::size_t i = 0; i < ctx.lines.size(); ++i) {
std::string_view trimmed = Trim(stripped[i]);
if (trimmed == "{" && !outLines.empty()) {
std::string_view prevTrim = i > 0 ? Trim(stripped[i - 1]) : std::string_view{};
bool headerBefore = prevTrim.ends_with(')') || prevTrim == "else" || prevTrim == "do" || prevTrim == "try";
bool hasComment = ctx.LineHasComment(i + 1) || (i > 0 && ctx.LineHasComment(i));
bool suppressed = ctx.Suppressed("brace-style", i) || ctx.Suppressed("brace-style", i + 1);
if (headerBefore && !hasComment && !suppressed) {
std::string& prev = outLines.back();
while (!prev.empty() && (prev.back() == ' ' || prev.back() == '\t')) prev.pop_back();
prev += " {";
changed = true;
continue;
}
}
outLines.emplace_back(ctx.Line(i + 1));
}
if (!changed) return;
std::string out;
for (std::size_t i = 0; i < outLines.size(); ++i) {
out += outLines[i];
if (i + 1 < outLines.size() || ctx.content.ends_with('\n')) out += '\n';
}
ctx.SetContent(std::move(out));
});
// Single-statement if bodies join onto the if line: `if (x)\n y;` →
// `if (x) y;` — when the condition's parens balance on one line, the body
// is one `;`-terminated statement, neither line carries a comment, and
// the joined line stays ≤ 250 columns.
cfg.AddLintRule("if-single-line", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::vector<std::string_view> stripped = Lines(ctx.CommentStripped());
static const std::regex ifHeader(R"(^\s*(?:\}?\s*else\s+)?if\s*\(.*\)\s*$)");
std::vector<std::string> outLines;
bool changed = false;
for (std::size_t i = 0; i < ctx.lines.size(); ++i) {
std::string lineStr(stripped[i]);
if (i + 1 < ctx.lines.size() && std::regex_match(lineStr, ifHeader) && ParenDelta(stripped[i]) == 0) {
std::string_view body = Trim(stripped[i + 1]);
bool joinable = !body.empty() && body != "{" && !body.starts_with("if") && body.ends_with(';')
&& !ctx.LineHasComment(i + 1) && !ctx.LineHasComment(i + 2)
&& !ctx.Suppressed("if-single-line", i + 1) && !ctx.Suppressed("if-single-line", i + 2);
std::string joined = std::string(ctx.Line(i + 1));
while (!joined.empty() && (joined.back() == ' ' || joined.back() == '\t')) joined.pop_back();
joined += " ";
joined += Trim(ctx.Line(i + 2));
if (joinable && joined.size() <= 250) {
outLines.push_back(std::move(joined));
++i; // consume the body line
changed = true;
continue;
}
}
outLines.emplace_back(ctx.Line(i + 1));
}
if (!changed) return;
std::string out;
for (std::size_t i = 0; i < outLines.size(); ++i) {
out += outLines[i];
if (i + 1 < outLines.size() || ctx.content.ends_with('\n')) out += '\n';
}
ctx.SetContent(std::move(out));
});
// Wrapped call arguments join back onto one line when the whole
// expression fits in 250 columns. Lambda bodies (lines ending `{`),
// comments, raw strings, and preprocessor lines are left alone.
// Operator-style continuations (next line starts with && / || / |) join
// under the same length limit.
cfg.AddLintRule("wrap-join", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
// Fixpoint loop: a join can enable another (joining an inner paren
// wrap balances the line an operator continuation hangs off), so one
// pass is not idempotent. Iterate until a pass changes nothing; the
// cap is a safety net — joins strictly reduce the line count, so
// termination is guaranteed anyway.
for (std::int32_t pass = 0; pass < 16; ++pass) {
std::vector<std::string_view> stripped = Lines(ctx.CommentStripped());
std::vector<std::string> outLines;
bool changed = false;
for (std::size_t i = 0; i < ctx.lines.size(); ++i) {
std::string_view trimmed = Trim(stripped[i]);
std::int64_t delta = ParenDelta(stripped[i]);
bool candidate = delta > 0 && !trimmed.empty() && !trimmed.starts_with('#')
&& !trimmed.ends_with('{') && !ctx.LineHasComment(i + 1) && !ctx.LineHasMultiLineToken(i + 1);
if (candidate) {
std::string joined(ctx.Line(i + 1));
std::size_t j = i + 1;
bool ok = true;
while (delta > 0 && j < ctx.lines.size() && j - i <= 4) {
std::string_view next = Trim(stripped[j]);
// A `{`-ending line is fine when it closes the expression
// (a control header's `) {`); mid-expression it means a
// lambda body starts — leave those wrapped.
bool closes = delta + ParenDelta(stripped[j]) <= 0;
if (next.empty() || (next.ends_with('{') && !closes)
|| ctx.LineHasComment(j + 1) || ctx.LineHasMultiLineToken(j + 1)) {
ok = false;
break;
}
while (!joined.empty() && (joined.back() == ' ' || joined.back() == '\t')) joined.pop_back();
std::string_view fragment = Trim(ctx.Line(j + 1));
// No separator right after an opening paren or before a
// closing one — joining must not manufacture `( x` / `x )`.
if (!joined.ends_with('(') && !fragment.starts_with(')') && !fragment.starts_with(',')) joined += " ";
joined += fragment;
delta += ParenDelta(stripped[j]);
++j;
}
for (std::size_t l = i + 1; ok && l <= j; ++l) ok = !ctx.Suppressed("wrap-join", l);
if (ok && delta <= 0 && joined.size() <= 250) {
outLines.push_back(std::move(joined));
i = j - 1; // consumed through line j-1 (0-based i)
changed = true;
continue;
}
} else if (delta == 0 && i + 1 < ctx.lines.size() && !trimmed.starts_with('#')
&& !ctx.LineHasComment(i + 1) && !ctx.LineHasMultiLineToken(i + 1)) {
auto isOpStart = [](std::string_view s) {
return s.starts_with("&&") || s.starts_with("||") || s.starts_with("| ");
};
// Operator-style continuation chain (`a\n && b\n && c`).
// Joined when the WHOLE chain stays within 250 columns —
// longer conditions legitimately wrap. Same mechanics as the
// paren join: chain lines must be comment-free, raw-string
// free, and paren-balanced.
if (isOpStart(Trim(stripped[i + 1])) && !isOpStart(trimmed)) {
std::string joined(ctx.Line(i + 1));
std::size_t j = i + 1;
bool ok = true;
while (j < ctx.lines.size() && isOpStart(Trim(stripped[j]))) {
if (ParenDelta(stripped[j]) != 0 || ctx.LineHasComment(j + 1) || ctx.LineHasMultiLineToken(j + 1)) {
ok = false;
break;
}
while (!joined.empty() && (joined.back() == ' ' || joined.back() == '\t')) joined.pop_back();
joined += " ";
joined += Trim(ctx.Line(j + 1));
++j;
}
for (std::size_t l = i + 1; ok && l <= j; ++l) ok = !ctx.Suppressed("wrap-join", l);
if (ok && joined.size() <= 250) {
outLines.push_back(std::move(joined));
i = j - 1; // consumed the chain
changed = true;
continue;
}
}
}
outLines.emplace_back(ctx.Line(i + 1));
}
if (!changed) return;
std::string out;
for (std::size_t i = 0; i < outLines.size(); ++i) {
out += outLines[i];
if (i + 1 < outLines.size() || ctx.content.ends_with('\n')) out += '\n';
}
ctx.SetContent(std::move(out));
}
});
// No space padding inside parens: `( x` / `x )` → `(x` / `x)`. Only
// intra-line (a line legitimately ends with '(' when a call wraps);
// string/comment interiors are excluded via the stripped text.
cfg.AddLintRule("paren-spacing", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
const std::string& code = ctx.CommentStripped();
std::vector<std::pair<std::size_t, std::size_t>> cuts; // [begin, end) spans of spaces to delete
for (std::size_t i = 0; i < code.size(); ++i) {
if (code[i] == '(' ) {
std::size_t j = i + 1;
while (j < code.size() && code[j] == ' ') ++j;
if (j > i + 1 && j < code.size() && code[j] != '\n' && code[j] != '\r') cuts.push_back({i + 1, j});
} else if (code[i] == ')') {
std::size_t j = i;
while (j > 0 && code[j - 1] == ' ') --j;
// Only single-space padding: multi-space runs are usually
// deliberate alignment columns.
if (j == i - 1 && j > 0 && code[j - 1] != '\n' && code[j - 1] != ',') cuts.push_back({j, i});
}
}
if (cuts.empty()) return;
std::string out = ctx.content;
for (auto it = cuts.rbegin(); it != cuts.rend(); ++it) out.erase(it->first, it->second - it->first);
ctx.SetContent(std::move(out));
});
cfg.AddLintRule("trim-trailing-ws", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
std::string out;
out.reserve(ctx.content.size());
for (std::size_t n = 1; n <= ctx.lines.size(); ++n) {
std::string_view line = ctx.Line(n);
// Byte fidelity on CRLF files: peel the \r, trim, put it back.
bool crlf = line.ends_with('\r');
if (crlf) line.remove_suffix(1);
while (line.ends_with(' ') || line.ends_with('\t')) line.remove_suffix(1);
out += line;
if (crlf) out += '\r';
// The last line only had a newline if the file ended with one —
// preserve that byte exactly so this rule doesn't shadow
// final-newline.
if (n < ctx.lines.size() || ctx.content.ends_with('\n')) out += '\n';
}
ctx.SetContent(std::move(out));
});
cfg.AddLintRule("final-newline", [](LintContext& ctx) {
if (!IsCppFile(ctx)) return;
if (!ctx.content.empty() && !ctx.content.ends_with('\n')) {
ctx.SetContent(ctx.content + '\n');
}
});
}
}

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// SPDX-License-Identifier: LGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
import std;
import Crafter.Build;
namespace fs = std::filesystem;
using namespace Crafter;
extern "C" Configuration CrafterBuildProject(std::span<const std::string_view> args) {
std::vector<std::string> depArgs(args.begin(), args.end());
const bool useLocal = std::erase(depArgs, "--local") > 0;
Configuration cfg;
cfg.path = "./";
cfg.name = "Crafter.LintRules";
cfg.outputName = "Crafter.LintRules";
cfg.type = ConfigurationType::LibraryStatic;
ApplyStandardArgs(cfg, args);
// No dependency on Crafter.Build, on purpose. The rules only ever run
// inside a crafter-build process, which provides the symbols, and a host
// build already sees the Crafter.Build modules through the PCM cache
// crafter-build keeps for its own project files — declaring the library
// here would make every consumer clone and build all of crafter-build
// just to lint.
std::array<fs::path, 1> ifaces = { "interfaces/Crafter.LintRules" };
std::array<fs::path, 0> impls = {};
cfg.GetInterfacesAndImplementations(ifaces, impls);
// The rule test compiles the module as its own interface and links
// crafter-build to run the linter in-process: from git by default, or
// the sibling checkout with `crafter-build test --local`. Host only,
// like the rules themselves.
if (cfg.target == "x86_64-pc-linux-gnu") {
Configuration* build = useLocal
? LocalProject({ .projectFile = "../Crafter.Build/project.cpp", .args = depArgs })
: GitProject({ .source = { .url = "https://forgejo.catcrafts.net/Catcrafts/Crafter.Build.git" }, .args = depArgs });
cfg.AddTest("HouseRules", ifaces).Dependencies({ build });
}
return cfg;
}

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// SPDX-License-Identifier: LGPL-3.0-only
// SPDX-FileCopyrightText: Copyright (C) 2026 Catcrafts®
import std;
import Crafter.Build;
import Crafter.LintRules;
namespace fs = std::filesystem;
using namespace Crafter;
// Validates the house-style ruleset — the transforms and reports every repo
// that imports Crafter.LintRules relies on. Each case writes a scratch file,
// runs ONE rule via the glob filter, and asserts the findings and/or
// rewritten bytes.
namespace {
std::int32_t Failures = 0;
void Check(bool cond, std::string_view msg) {
if (!cond) {
std::println(std::cerr, "FAIL: {}", msg);
++Failures;
}
}
struct RuleRun {
LintSummary summary;
std::string text; // file content after the run
};
RuleRun RunRule(std::string_view content, std::string_view rule, LintMode mode) {
static std::int32_t Counter = 0;
fs::path dir = fs::temp_directory_path() / "crafter-build-house-rules" / std::format("case-{}", Counter++);
fs::remove_all(dir);
fs::create_directories(dir);
{
std::ofstream f(dir / "f.cpp", std::ios::binary | std::ios::trunc);
f.write(content.data(), static_cast<std::streamsize>(content.size()));
}
Configuration cfg;
cfg.path = dir;
cfg.name = "house-fixture";
cfg.outputName = "house-fixture";
cfg.target = HostTarget();
std::array<fs::path, 0> ifaces = {};
std::array<fs::path, 1> impls = { "f" };
cfg.GetInterfacesAndImplementations(ifaces, impls);
LintRules::AddRules(cfg);
RunLintOptions opts;
opts.mode = mode;
opts.globs = { std::string(rule) };
RuleRun run;
run.summary = RunLint(cfg, opts);
std::ifstream f(dir / "f.cpp", std::ios::binary);
std::stringstream buffer;
buffer << f.rdbuf();
run.text = std::move(buffer).str();
return run;
}
bool HasFinding(const LintSummary& s, std::string_view fragment) {
return std::any_of(s.findings.begin(), s.findings.end(), [&](const LintFinding& f) { return f.message.contains(fragment); });
}
}
int main() {
// fixed-width-types: int/long long convert; main/argc and extern "C" stay.
{
RuleRun r = RunRule("int Foo(long long v) { int x = 5; return x; }\n" "extern \"C\" int setenv(const char* n, const char* v, int o);\n" "int main(int argc, char** argv) { return 0; }\n", "fixed-width-types", LintMode::Apply);
Check(r.text.contains("std::int32_t Foo(std::int64_t v) { std::int32_t x = 5;"), "fixed-width converts int and long long");
Check(r.text.contains("extern \"C\" int setenv"), "extern \"C\" prototype keeps int");
Check(r.text.contains("int main(int argc"), "main/argc keep int");
}
// fixed-width-types is signed/unsigned aware, in any specifier order;
// bare char (text) and long double (floating) are not integers.
{
RuleRun r = RunRule("void F() {\n"
" unsigned a = 1;\n"
" unsigned int b = 2;\n"
" unsigned long long c = 3;\n"
" long unsigned int d = 4;\n"
" unsigned short e = 5;\n"
" signed f = 6;\n"
" signed char g = 7;\n"
" auto h = static_cast<unsigned char>(g);\n"
" char text = 'x';\n"
" long double pi = 3.14L;\n"
"}\n",
"fixed-width-types", LintMode::Apply);
Check(r.text.contains("std::uint32_t a = 1;"), "bare unsigned -> uint32");
Check(r.text.contains("std::uint32_t b = 2;"), "unsigned int -> uint32");
Check(r.text.contains("std::uint64_t c = 3;"), "unsigned long long -> uint64");
Check(r.text.contains("std::uint64_t d = 4;"), "long unsigned int (reordered) -> uint64");
Check(r.text.contains("std::uint16_t e = 5;"), "unsigned short -> uint16");
Check(r.text.contains("std::int32_t f = 6;"), "bare signed -> int32");
Check(r.text.contains("std::int8_t g = 7;"), "signed char -> int8");
Check(r.text.contains("static_cast<std::uint8_t>(g)"), "unsigned char -> uint8");
Check(r.text.contains("char text = 'x';"), "bare char stays (text, not an integer)");
Check(r.text.contains("long double pi = 3.14L;"), "long double stays (floating type)");
}
// brace-style: Allman brace joins; standalone scope block stays.
{
RuleRun r = RunRule("void Foo()\n{\n}\n\nvoid Bar() {\n Baz();\n {\n Qux();\n }\n}\n", "brace-style", LintMode::Apply);
Check(r.text.contains("void Foo() {"), "Allman brace joined onto header");
Check(r.text.contains("Baz();\n {"), "scope block brace untouched");
}
// if-single-line: short body joins; braced body stays.
{
RuleRun r = RunRule("void F(bool b) {\n if (b)\n Run();\n if (b) {\n Run();\n }\n}\n", "if-single-line", LintMode::Apply);
Check(r.text.contains("if (b) Run();"), "single-statement if body joined");
Check(r.text.contains("if (b) {"), "braced if body untouched");
}
// single-declaration splits on the AST, so each declarator carries its own
// resolved type. That is the whole reason it is not a token rule: copying
// the head's type prefix turns `int* a, b;` into `int* a; int* b;` and
// silently changes b from int to int*.
{
RuleRun r = RunRule("#include <vector>\n"
"void F() {\n"
" bool a = false, b = true;\n"
" int* ptrA = nullptr, *ptrB = nullptr;\n"
" int* mixed = nullptr, plain = 7;\n"
" std::vector<int> tmplA{}, tmplB{};\n"
" int callA = g(), callB = h();\n"
" int keep = 1, kept = 2; // trailing comment\n"
"}\n",
"single-declaration", LintMode::Apply);
Check(r.text.contains("bool a = false;\n bool b = true;"), "single-declaration: simple split");
Check(r.text.contains("int* ptrA = nullptr;\n int* ptrB = nullptr;"), "single-declaration: pointers split, star kept on the type");
// The case a token-based splitter gets wrong.
Check(r.text.contains("int* mixed = nullptr;\n int plain = 7;"), "single-declaration: only the starred declarator is a pointer");
Check(r.text.contains("std::vector<int> tmplA{};\n std::vector<int> tmplB{};"), "single-declaration: template arguments are not a bail-out");
Check(r.text.contains("int callA = g();\n int callB = h();"), "single-declaration: call initialisers are not a bail-out");
// A comment after the ';' is outside the replaced range, so it survives;
// the line-based version refused the whole line instead.
Check(r.text.contains("int keep = 1;\n int kept = 2; // trailing comment"), "single-declaration: trailing comment survives the split");
RuleRun again = RunRule(r.text, "single-declaration", LintMode::Apply);
Check(again.summary.changedFiles.empty(), "single-declaration: idempotent");
}
// wrap-join: short wrapped call joins; operator chain joins; long stays.
{
RuleRun r = RunRule("void F() {\n G(alpha,\n beta);\n bool x = alpha\n && beta;\n}\n", "wrap-join", LintMode::Apply);
Check(r.text.contains("G(alpha, beta);"), "wrapped call arguments joined");
Check(r.text.contains("bool x = alpha && beta;"), "operator continuation joined");
}
// format-concat: literal-adjacent + rewrites; += RHS rewrites; args survive.
{
RuleRun r = RunRule("void F(std::string name, std::string cmd) {\n"
" std::string a = name + \".cpp\";\n"
" std::string b = \"pre-\" + name + \"-post\";\n"
" cmd += \" \" + name;\n"
" std::string keep = name + cmd;\n"
" fs::path p;\n"
" std::string c = p.stem().string() + \".pcm\";\n"
" fs::path d = std::string(cmd) + \".so\";\n"
"}\n",
"format-concat", LintMode::Apply);
Check(r.text.contains("std::string a = std::format(\"{}.cpp\", name);"), "trailing literal converts");
Check(!r.text.contains("namestd::format"), "replacement splices at the operand boundary");
Check(r.text.contains("std::string b = std::format(\"pre-{}-post\", name);"), "sandwich chain converts");
Check(r.text.contains("cmd += std::format(\" {}\", name);"), "+= RHS converts");
Check(r.text.contains("std::string keep = name + cmd;"), "literal-free + is left alone");
Check(r.text.contains("std::string c = std::format(\"{}.pcm\", p.stem().string());"), "call-chain left operand consumed whole (the stringstd regression)");
Check(r.text.contains("fs::path d = std::format(\"{}.so\", std::string(cmd));"), "constructor-call left operand consumed whole");
}
{
// Ternary and raw-string lines are reported, never rewritten.
RuleRun r = RunRule("std::string F(bool b, std::string n) { return b ? n + \".x\" : n; }\n", "format-concat", LintMode::Report);
Check(HasFinding(r.summary, "not auto-fixable"), "ternary concat reports instead of fixing");
Check(r.text.contains("n + \".x\""), "ternary concat untouched on disk");
}
// paren-spacing: single-space padding removed; wrapped call ends keep.
{
RuleRun r = RunRule("void F() {\n G( x );\n}\n", "paren-spacing", LintMode::Apply);
Check(r.text.contains("G(x);"), "paren padding removed");
}
// naming: wrong-case function/type/static/global flagged; camel local passes.
{
RuleRun r = RunRule("namespace {\n"
" std::int32_t bad_global = 0;\n"
" struct lint_thing {};\n"
"}\n"
"void lower_func() {\n"
" static bool lowerStatic = false;\n"
" std::int32_t fineLocal = 1;\n"
"}\n",
"naming", LintMode::Report);
Check(HasFinding(r.summary, "'bad_global' should be PascalCase"), "lowercase global flagged");
Check(HasFinding(r.summary, "'lint_thing' should be PascalCase"), "lowercase type flagged");
Check(HasFinding(r.summary, "'lower_func' should be PascalCase"), "lowercase function flagged");
Check(HasFinding(r.summary, "'lowerStatic' should be PascalCase"), "camel static flagged");
Check(!HasFinding(r.summary, "fineLocal"), "camelCase local passes");
}
{
// Statement calls with inline lambda arguments are NOT function
// definitions (the any_of regression); a genuine lowercase one-liner
// method still is.
RuleRun r = RunRule("struct Holder {\n"
" bool clean() const { return true; }\n"
"};\n"
"void T(std::vector<std::int32_t>& v) {\n"
" bool x = std::any_of(v.begin(), v.end(), [](std::int32_t n) { return n > 0; });\n"
" std::erase_if(v, [](std::int32_t n) { return n < 0; });\n"
"}\n",
"naming", LintMode::Report);
Check(!HasFinding(r.summary, "any_of"), "call with lambda argument is not a function definition");
Check(!HasFinding(r.summary, "erase_if"), "bare statement call is not a function definition");
Check(HasFinding(r.summary, "'clean' should be PascalCase"), "lowercase one-liner method still flagged");
}
// enum-class + no-iostream-print reports.
{
RuleRun r = RunRule("enum Color { Red };\n", "enum-class", LintMode::Report);
Check(HasFinding(r.summary, "enum class"), "plain enum flagged");
}
{
RuleRun r = RunRule("void F() { std::cout << 1; }\n", "no-iostream-print", LintMode::Report);
Check(HasFinding(r.summary, "std::println"), "std::cout flagged");
}
// The whole ruleset is idempotent: a second Apply changes nothing.
{
std::string_view source = "int Foo()\n{\n std::string s = std::string(\"a\") + \"b\";\n if (true)\n return 1;\n return 0;\n}\n";
static constexpr std::string_view AllRules = "*";
RuleRun first = RunRule(source, AllRules, LintMode::Apply);
RuleRun second = RunRule(first.text, AllRules, LintMode::Apply);
Check(second.summary.changedFiles.empty(), "second apply of the full ruleset is a no-op");
Check(first.text != source, "first apply actually changed the fixture");
}
// Suppression directives against house transforms: the driver reverts
// line-preserving edits (fixed-width) and the count-changing rules check
// Suppressed() themselves (wrap-join).
{
RuleRun r = RunRule("void F() {\n"
" // lint-disable-next-line fixed-width-types\n"
" int keep = 1;\n"
" int convert = 2;\n"
"}\n",
"fixed-width-types", LintMode::Apply);
Check(r.text.contains("int keep = 1;"), "next-line directive keeps the suppressed int");
Check(r.text.contains("std::int32_t convert = 2;"), "unsuppressed line still converts");
}
{
RuleRun r = RunRule("void F() {\n"
" // lint-disable-next-line wrap-join\n"
" G(alpha,\n"
" beta);\n"
" H(alpha,\n"
" beta);\n"
"}\n",
"wrap-join", LintMode::Apply);
Check(r.text.contains("G(alpha,\n"), "suppressed wrap stays wrapped");
Check(r.text.contains("H(alpha, beta);"), "unsuppressed wrap still joins");
}
// wrap-join converges in ONE run: joining the inner paren wrap balances
// the && line, which only then becomes an operator-joinable continuation.
{
RuleRun r = RunRule("void F() {\n"
" bool ok = alpha\n"
" && beta(gamma,\n"
" delta);\n"
"}\n",
"wrap-join", LintMode::Apply);
Check(r.text.contains("bool ok = alpha && beta(gamma, delta);"), "self-enabling joins reach the fixpoint in one apply");
RuleRun second = RunRule(r.text, "wrap-join", LintMode::Apply);
Check(second.summary.changedFiles.empty(), "wrap-join is idempotent after the fixpoint");
}
// The guards used to be substring probes over the raw line, so a literal
// whose TEXT contained `//` or `R"` looked like a comment or a raw string
// and silently disabled the rule. Both shapes occur in this repo's own
// sources — "MARKER" ends in the characters R", and any string mentioning
// a lint-disable directive contains //.
{
RuleRun r = RunRule("void F() {\n" " auto hit = text.find(\"MARKER\",\n" " start);\n" "}\n", "wrap-join", LintMode::Apply);
Check(r.text.contains("text.find(\"MARKER\", start);"), "R\" inside a literal no longer blocks wrap-join");
}
{
RuleRun r = RunRule("void F() {\n" " Check(read() == \"// lint-disable-next-line trim\\n\",\n" " \"message\");\n" "}\n", "wrap-join", LintMode::Apply);
Check(r.text.contains("\\n\", \"message\");"), "// inside a literal no longer blocks wrap-join");
}
// A real trailing comment still blocks the join: text pulled up past a
// `//` would be swallowed by it.
{
RuleRun r = RunRule("void F() {\n" " auto v = g(alpha, // why\n" " beta);\n" "}\n", "wrap-join", LintMode::Apply);
Check(r.text.contains("g(alpha, // why\n"), "a real comment still blocks wrap-join");
}
// A genuinely multi-line literal is never reflowed — joining its lines
// would change the string's contents.
{
std::string_view source = "void F() {\n"
" auto text = R\"sql(SELECT a,\n"
" b FROM t)sql\";\n"
"}\n";
RuleRun r = RunRule(source, "wrap-join", LintMode::Apply);
Check(r.text == source, "wrap-join leaves a multi-line raw string alone");
RuleRun paren = RunRule(source, "paren-spacing", LintMode::Apply);
Check(paren.text == source, "paren-spacing leaves a multi-line raw string alone");
}
// Type keywords inside a literal are text, not declarations.
{
std::string_view source = "void F() {\n"
" auto sql = R\"q(int x; unsigned long y;)q\";\n"
"}\n";
RuleRun r = RunRule(source, "fixed-width-types", LintMode::Apply);
Check(r.text == source, "fixed-width-types leaves type names inside a raw string alone");
}
// no-char-pointer reads the AST, so it distinguishes OUR char* from one
// whose spelling belongs to somebody else's header. This is what replaced
// the substring denylist (argv, getenv, c_str, reinterpret_cast, …): each
// entry there disabled the rule for a whole line, and the list could only
// grow as new libraries arrived.
{
RuleRun r = RunRule("#include <cstdlib>\n"
"#include <string>\n"
"extern \"C\" const char* CApiEntry(const char* path);\n"
"char* OurBadApi(char* input) { return input; }\n"
"void F() {\n"
" char* fromLibc = std::getenv(\"HOME\");\n"
" std::string mine = \"ok\";\n"
" const char* toLibc = mine.c_str();\n"
" auto raw = reinterpret_cast<char*>(&mine);\n"
"}\n",
"no-char-pointer", LintMode::Report);
// Ours, so reported: the declaration and its parameter.
Check(HasFinding(r.summary, "'OurBadApi'"), "no-char-pointer: our own char* return is reported");
Check(HasFinding(r.summary, "'input'"), "no-char-pointer: our own char* parameter is reported");
// Foreign, so exempt — each for a reason, not by name.
Check(!HasFinding(r.summary, "'CApiEntry'"), "no-char-pointer: extern \"C\" declaration is exempt");
Check(!HasFinding(r.summary, "'path'"), "no-char-pointer: extern \"C\" parameter is exempt");
Check(!HasFinding(r.summary, "'fromLibc'"), "no-char-pointer: a value from libc is exempt");
Check(!HasFinding(r.summary, "'toLibc'"), "no-char-pointer: a value from c_str() is exempt");
// A local whose deduced type is char* is still our declaration, so it
// is reported. The old denylist exempted every line mentioning
// reinterpret_cast; a deliberate low-level cast now takes an explicit
// lint-disable comment, which is at least visible at the site.
Check(HasFinding(r.summary, "'raw'"), "no-char-pointer: a deduced char* local is still ours");
}
// Cases the line-based heuristic structurally could not see. It only looked
// at declarations starting at cumulative paren depth 0 and inferred scope
// from a running {/} count, so a wrapped signature, a specifier split over
// two lines, or a local shadowing a member all escaped it.
{
RuleRun r = RunRule("#include <string>\n"
"namespace Outer {\n"
" int wrapped_function(\n"
" int first,\n"
" int second) { return first + second; }\n"
" static\n"
" int splitStatic = 1;\n"
" struct Holder {\n"
" int Member = 0;\n"
" void Method() {\n"
" int Local = 1;\n"
" (void)Local;\n"
" }\n"
" };\n"
"}\n"
"extern \"C\" int c_api_entry(const char* name);\n",
"naming", LintMode::Report);
// A signature wrapped over lines is still a function declaration.
Check(HasFinding(r.summary, "'wrapped_function' should be PascalCase"), "naming: wrapped signature is seen");
// `static` on its own line still applies to the declaration below it.
Check(HasFinding(r.summary, "'splitStatic' should be PascalCase"), "naming: split specifier is seen");
// Members are camelCase; the enclosing kind decides, not a brace count.
Check(HasFinding(r.summary, "'Member' should be camelCase"), "naming: member is checked as a member");
// A local inside a method is a local, not a member and not a global.
Check(HasFinding(r.summary, "'Local' should be camelCase"), "naming: local inside a method is a local");
// Named by libc, not by us.
Check(!HasFinding(r.summary, "c_api_entry"), "naming: extern \"C\" declaration is exempt");
Check(!HasFinding(r.summary, "'Method'"), "naming: PascalCase method passes");
Check(!HasFinding(r.summary, "'Holder'"), "naming: PascalCase type passes");
}
// fixed-width-types must not rewrite an integer whose width somebody else's
// header chose — the rewrite would leave code that no longer matches the API
// it calls. Derived from the AST, so the exemption is per-declaration rather
// than the old per-line textual one, which both missed cases and disabled
// the rule for anything else sharing a line with `argc`/`extern "`.
{
RuleRun r = RunRule("#include <cstdlib>\n"
"extern \"C\" unsigned long CApiCall(unsigned int flags);\n"
"long OurOwnApi(int value) { return value; }\n"
"void F() {\n"
" unsigned long fromLibc = std::strtoul(\"1\", nullptr, 10);\n"
" unsigned ours = 1;\n"
" (void)fromLibc; (void)ours;\n"
"}\n"
"int main(int argc, char** argv) {\n"
" for (int i = 0; i < argc; ++i) { (void)argv[i]; }\n"
" return 0;\n"
"}\n",
"fixed-width-types", LintMode::Apply);
// Somebody else's widths, kept.
Check(r.text.contains("extern \"C\" unsigned long CApiCall(unsigned int flags);"), "fixed-width: extern \"C\" signature keeps its widths");
Check(r.text.contains("unsigned long fromLibc = std::strtoul"), "fixed-width: a value from a C library keeps its width");
Check(r.text.contains("int main(int argc, char** argv)"), "fixed-width: main's signature is untouched");
// Ours, converted.
Check(r.text.contains("std::int64_t OurOwnApi(std::int32_t value)"), "fixed-width: our own signature converts");
Check(r.text.contains("std::uint32_t ours = 1;"), "fixed-width: our own local converts");
// The loop counter inside main's BODY is ordinary code. The old rule
// skipped it because `argc` appeared on the same line; only the
// signature is exempt now, not everything near it.
Check(r.text.contains("for (std::int32_t i = 0;"), "fixed-width: main's body is not exempt, only its signature");
}
// enum-class asks for the next TOKEN after `enum`, so a declaration split
// over lines reads the same as one that is not. The regex it replaced
// required the name to follow `enum` on the same line.
{
RuleRun r = RunRule("enum Plain { A };\n"
"enum\n"
" Split { B };\n"
"enum class Scoped { C };\n"
"enum\n"
" class SplitScoped { D };\n"
"enum struct AlsoFine { E };\n",
"enum-class", LintMode::Report);
Check(r.summary.findings.size() == 2, std::format("enum-class: exactly the two plain enums ({} found)", r.summary.findings.size()));
const bool onFirst = std::any_of(r.summary.findings.begin(), r.summary.findings.end(), [](const LintFinding& f) { return f.line == 1; });
const bool onSplit = std::any_of(r.summary.findings.begin(), r.summary.findings.end(), [](const LintFinding& f) { return f.line == 2; });
Check(onFirst, "enum-class: single-line plain enum reported");
Check(onSplit, "enum-class: line-split plain enum reported at the keyword");
}
// const-local's mutation analysis is exact for scalars: assignment, ++/--,
// address-of and binding to a non-const reference are the only ways to
// write one, and all four are tracked. Both directions matter — a missed
// write means advising const on something that cannot be const.
{
RuleRun r = RunRule("void Mutate(int& out);\n"
"void ReadOnly(const int& in);\n"
"void ByValue(int v);\n"
"int Compute();\n"
"void F() {\n"
" int neverWritten = 1;\n"
" int assigned = 1; assigned = 2;\n"
" int incremented = 1; ++incremented;\n"
" int compound = 1; compound += 2;\n"
" int addressed = 1; int* taken = &addressed;\n"
" int toMutatingRef = 1; Mutate(toMutatingRef);\n"
" int toConstRef = 1; ReadOnly(toConstRef);\n"
" int toByValue = 1; ByValue(toByValue);\n"
" int boundToRef = 1; int& alias = boundToRef;\n"
" for (int loop = 0; loop < 1; ++loop) { (void)loop; }\n"
" (void)taken; (void)alias;\n"
"}\n",
"const-local", LintMode::Report);
Check(HasFinding(r.summary, "'neverWritten'"), "const-local: an unwritten local is reported");
Check(HasFinding(r.summary, "'toConstRef'"), "const-local: passing to a const& is not a write");
Check(HasFinding(r.summary, "'toByValue'"), "const-local: passing by value is not a write");
Check(!HasFinding(r.summary, "'assigned'"), "const-local: assignment is a write");
Check(!HasFinding(r.summary, "'incremented'"), "const-local: ++ is a write");
Check(!HasFinding(r.summary, "'compound'"), "const-local: += is a write");
Check(!HasFinding(r.summary, "'addressed'"), "const-local: taking an address counts as a write");
Check(!HasFinding(r.summary, "'toMutatingRef'"), "const-local: binding to a non-const& parameter is a write");
Check(!HasFinding(r.summary, "'boundToRef'"), "const-local: binding to a non-const& local is a write");
Check(!HasFinding(r.summary, "'loop'"), "const-local: a mutated loop counter is not reported");
// Pointers and range-for bindings are excluded: `T* const p` and
// `for (T* const x : …)` are not spellings anybody writes.
Check(!HasFinding(r.summary, "'taken'"), "const-local: pointer locals are out of scope");
}
{
RuleRun r = RunRule("void F() {\n" " for (int each : Range()) { (void)each; }\n" "}\n", "const-local", LintMode::Report);
Check(!HasFinding(r.summary, "'each'"), "const-local: a range-for binding is not reported");
}
// constexpr-constant asks clang's constant evaluator, not the tokens of the
// initialiser. sizeof and a fold over other constants are constant
// expressions that no token scan can recognise; a call result is not.
{
RuleRun r = RunRule("int Compute();\n"
"constexpr int Base = 4;\n"
"struct Big { int a, b; };\n"
"void F() {\n"
" const int literal = 4;\n"
" const int folded = 1 << 4;\n"
" const int fromSizeof = sizeof(Big);\n"
" const int fromOtherConstant = Base + 1;\n"
" const int fromCall = Compute();\n"
" constexpr int already = 8;\n"
" (void)literal; (void)folded; (void)fromSizeof;\n"
" (void)fromOtherConstant; (void)fromCall; (void)already;\n"
"}\n",
"constexpr-constant", LintMode::Report);
Check(HasFinding(r.summary, "'literal'"), "constexpr: a literal constant is reported");
Check(HasFinding(r.summary, "'folded'"), "constexpr: an operator fold over literals is reported");
// Neither of these is reachable from a token scan of the initialiser.
Check(HasFinding(r.summary, "'fromSizeof'"), "constexpr: sizeof folds");
Check(HasFinding(r.summary, "'fromOtherConstant'"), "constexpr: a fold over another constant folds");
Check(!HasFinding(r.summary, "'fromCall'"), "constexpr: a call result is not a constant expression");
Check(!HasFinding(r.summary, "'already'"), "constexpr: an existing constexpr is not re-reported");
}
if (Failures > 0) {
std::println(std::cerr, "{} assertions failed", Failures);
return 1;
}
return 0;
}