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//===-- lib/Parser/source.cpp ---------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "flang/Parser/source.h"
#include "flang/Common/idioms.h"
#include "flang/Parser/char-buffer.h"
#include "llvm/Support/Errno.h"
#include "llvm/Support/FileSystem.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <memory>
#include <vector>
namespace Fortran::parser {
SourceFile::~SourceFile() { Close(); }
static std::vector<std::size_t> FindLineStarts(llvm::StringRef source) {
std::vector<std::size_t> result;
if (source.size() > 0) {
CHECK(source.back() == '\n' && "missing ultimate newline");
std::size_t at{0};
do {
result.push_back(at);
at = source.find('\n', at) + 1;
} while (at < source.size());
result.shrink_to_fit();
}
return result;
}
void SourceFile::RecordLineStarts() {
lineStart_ = FindLineStarts({content().data(), bytes()});
}
// Check for a Unicode byte order mark (BOM).
// Module files all have one; so can source files.
void SourceFile::IdentifyPayload() {
llvm::StringRef content{buf_->getBufferStart(), buf_->getBufferSize()};
constexpr llvm::StringLiteral UTF8_BOM{"\xef\xbb\xbf"};
if (content.startswith(UTF8_BOM)) {
bom_end_ = UTF8_BOM.size();
encoding_ = Encoding::UTF_8;
}
}
std::string DirectoryName(std::string path) {
llvm::SmallString<128> pathBuf{path};
llvm::sys::path::remove_filename(pathBuf);
return pathBuf.str().str();
}
std::optional<std::string> LocateSourceFile(
std::string name, const std::list<std::string> &searchPath) {
if (name == "-" || llvm::sys::path::is_absolute(name)) {
return name;
}
for (const std::string &dir : searchPath) {
llvm::SmallString<128> path{dir};
llvm::sys::path::append(path, name);
bool isDir{false};
auto er = llvm::sys::fs::is_directory(path, isDir);
if (!er && !isDir) {
return path.str().str();
}
}
return std::nullopt;
}
std::size_t RemoveCarriageReturns(llvm::MutableArrayRef<char> buf) {
std::size_t wrote{0};
char *buffer{buf.data()};
char *p{buf.data()};
std::size_t bytes = buf.size();
while (bytes > 0) {
void *vp{static_cast<void *>(p)};
void *crvp{std::memchr(vp, '\r', bytes)};
char *crcp{static_cast<char *>(crvp)};
if (!crcp) {
std::memmove(buffer + wrote, p, bytes);
wrote += bytes;
break;
}
std::size_t chunk = crcp - p;
auto advance{chunk + 1};
if (chunk + 1 >= bytes || crcp[1] == '\n') {
// CR followed by LF or EOF: omit
} else if ((chunk == 0 && p == buf.data()) || crcp[-1] == '\n') {
// CR preceded by LF or BOF: omit
} else {
// CR in line: retain
++chunk;
}
std::memmove(buffer + wrote, p, chunk);
wrote += chunk;
p += advance;
bytes -= advance;
}
return wrote;
}
bool SourceFile::Open(std::string path, llvm::raw_ostream &error) {
Close();
path_ = path;
std::string errorPath{"'"s + path_ + "'"};
auto bufOr{llvm::WritableMemoryBuffer::getFile(path)};
if (!bufOr) {
auto err = bufOr.getError();
error << "Could not open " << errorPath << ": " << err.message();
return false;
}
buf_ = std::move(bufOr.get());
ReadFile();
return true;
}
bool SourceFile::ReadStandardInput(llvm::raw_ostream &error) {
Close();
path_ = "standard input";
auto buf_or = llvm::MemoryBuffer::getSTDIN();
if (!buf_or) {
auto err = buf_or.getError();
error << err.message();
return false;
}
auto inbuf = std::move(buf_or.get());
buf_ =
llvm::WritableMemoryBuffer::getNewUninitMemBuffer(inbuf->getBufferSize());
llvm::copy(inbuf->getBuffer(), buf_->getBufferStart());
ReadFile();
return true;
}
void SourceFile::ReadFile() {
buf_end_ = RemoveCarriageReturns(buf_->getBuffer());
if (content().size() == 0 || content().back() != '\n') {
// Don't bother to copy if we have spare memory
if (content().size() >= buf_->getBufferSize()) {
auto tmp_buf{llvm::WritableMemoryBuffer::getNewUninitMemBuffer(
content().size() + 1)};
llvm::copy(content(), tmp_buf->getBufferStart());
buf_ = std::move(tmp_buf);
}
buf_end_++;
buf_->getBuffer()[buf_end_ - 1] = '\n';
}
IdentifyPayload();
RecordLineStarts();
}
void SourceFile::Close() {
path_.clear();
buf_.reset();
}
SourcePosition SourceFile::FindOffsetLineAndColumn(std::size_t at) const {
CHECK(at < bytes());
auto it = llvm::upper_bound(lineStart_, at);
auto low = std::distance(lineStart_.begin(), it - 1);
return {*this, static_cast<int>(low + 1),
static_cast<int>(at - lineStart_[low] + 1)};
}
} // namespace Fortran::parser
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