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Feat: Add ability to compile from stdin #1327

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merged 6 commits into from
Nov 2, 2024
Merged

Feat: Add ability to compile from stdin #1327

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292bcd1
Implement ability to compile directly from stdin
vanceism7 Oct 22, 2024
f1152ce
Add doc comment to process_cpp2 function
vanceism7 Oct 22, 2024
5c32f79
Move choice between file or stdin to source.load()
vanceism7 Oct 22, 2024
e579c05
Add a little comment above source loading decision
vanceism7 Oct 22, 2024
f6e1362
Don't file-open `stdin`
vanceism7 Oct 23, 2024
72b7e72
Fixed logic, and added default to stdout if stdin is used
hsutter Nov 2, 2024
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4 changes: 3 additions & 1 deletion source/common.h
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Original file line number Diff line number Diff line change
Expand Up @@ -799,7 +799,9 @@ class cmdline_processor
[](auto& a, auto& b){ return a.group < b.group || (a.group == b.group && a.name < b.name); }
);

print("\nUsage: cppfront [options] file ...\n\nOptions:\n");
print("\nUsage: cppfront [options] file ...\n");
print("\nfile - The source file(s) to compile (can be 'stdin' to read text directly) \n");
print("\nOptions: \n");
int last_group = -1;
for (auto& flag : flags) {
// Skip hidden flags
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14 changes: 10 additions & 4 deletions source/io.h
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Expand Up @@ -882,11 +882,17 @@ class source
)
-> bool
{
std::ifstream in{ filename };
if (!in.is_open()) {
return false;
// If filename is stdin, we read from stdin, otherwise we try to read the file
//
auto is_stdin = filename == "stdin";
std::ifstream fss;
if (is_stdin)
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! missing? Otherwise compiling a named file breaks.

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Oops. That was definitely my bad 😅 . Thanks for fixing

{
fss.open(filename);
if( !fss.is_open()) { return false; }
}

std::istream& in = is_stdin ? std::cin : fss;

auto in_comment = false;
auto in_string_literal = false;
auto in_raw_string_literal = false;
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1 change: 1 addition & 0 deletions source/to_cpp1.h
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Expand Up @@ -1179,6 +1179,7 @@ class cppfront
if (
!sourcefile.ends_with(".cpp2")
&& !sourcefile.ends_with(".h2")
&& sourcefile != "stdin"
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This part is fine, but we need to also update later logic that generates the output filename and currently assumes it ends in one of these and so just truncates the last character (e.g., .cpp2 becomes .cpp. When I tried to use stdin the output went to a file named stdi (last character blindly truncated).

How is this intended to work -- if you use stdin, is the output expected to go to stdout, or if to a named file what is the intended name?

I think the right answer is probably to default to stdout unless the programmer overrode that with -o. I'll implement that, and also make sure the output to stdout is clean of other messages when there are no errors.

)
{
errors.emplace_back(
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