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/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmGccDepfileLexerHelper.h"
#include <algorithm>
#include <cstdio>
#include <memory>
#include <string>
#include <vector>
#include "cmGccDepfileReaderTypes.h"
#include "LexerParser/cmGccDepfileLexer.h"
#ifdef _WIN32
# include <cctype>
# include "cmsys/Encoding.h"
#endif
bool cmGccDepfileLexerHelper::readFile(const char* filePath)
{
#ifdef _WIN32
wchar_t* wpath = cmsysEncoding_DupToWide(filePath);
FILE* file = _wfopen(wpath, L"rb");
free(wpath);
#else
FILE* file = fopen(filePath, "r");
#endif
if (!file) {
return false;
}
this->newEntry();
yyscan_t scanner;
cmGccDepfile_yylex_init(&scanner);
cmGccDepfile_yyset_extra(this, scanner);
cmGccDepfile_yyrestart(file, scanner);
cmGccDepfile_yylex(scanner);
cmGccDepfile_yylex_destroy(scanner);
this->sanitizeContent();
fclose(file);
return this->HelperState != State::Failed;
}
void cmGccDepfileLexerHelper::newEntry()
{
if (this->HelperState == State::Rule && !this->Content.empty()) {
if (!this->Content.back().rules.empty() &&
!this->Content.back().rules.back().empty()) {
this->HelperState = State::Failed;
}
return;
}
this->HelperState = State::Rule;
this->Content.emplace_back();
this->newRule();
}
void cmGccDepfileLexerHelper::newRule()
{
auto& entry = this->Content.back();
if (entry.rules.empty() || !entry.rules.back().empty()) {
entry.rules.emplace_back();
}
}
void cmGccDepfileLexerHelper::newDependency()
{
if (this->HelperState == State::Failed) {
return;
}
this->HelperState = State::Dependency;
auto& entry = this->Content.back();
if (entry.paths.empty() || !entry.paths.back().empty()) {
entry.paths.emplace_back();
}
}
void cmGccDepfileLexerHelper::newRuleOrDependency()
{
if (this->HelperState == State::Rule) {
this->newRule();
} else if (this->HelperState == State::Dependency) {
this->newDependency();
}
}
void cmGccDepfileLexerHelper::addToCurrentPath(const char* s)
{
if (this->Content.empty()) {
return;
}
cmGccStyleDependency* dep = &this->Content.back();
std::string* dst = nullptr;
switch (this->HelperState) {
case State::Rule: {
if (dep->rules.empty()) {
return;
}
dst = &dep->rules.back();
} break;
case State::Dependency: {
if (dep->paths.empty()) {
return;
}
dst = &dep->paths.back();
} break;
case State::Failed:
return;
}
dst->append(s);
}
void cmGccDepfileLexerHelper::sanitizeContent()
{
for (auto it = this->Content.begin(); it != this->Content.end();) {
// remove duplicate path entries
std::sort(it->paths.begin(), it->paths.end());
auto last = std::unique(it->paths.begin(), it->paths.end());
it->paths.erase(last, it->paths.end());
// Remove empty paths and normalize windows paths
for (auto pit = it->paths.begin(); pit != it->paths.end();) {
if (pit->empty()) {
pit = it->paths.erase(pit);
} else {
#if defined(_WIN32)
// Unescape the colon following the drive letter.
// Some versions of GNU compilers can escape this character.
// c\:\path must be transformed to c:\path
if (pit->size() >= 3 && std::toupper((*pit)[0]) >= 'A' &&
std::toupper((*pit)[0]) <= 'Z' && (*pit)[1] == '\\' &&
(*pit)[2] == ':') {
pit->erase(1, 1);
}
#endif
++pit;
}
}
// Remove empty rules
for (auto rit = it->rules.begin(); rit != it->rules.end();) {
if (rit->empty()) {
rit = it->rules.erase(rit);
} else {
++rit;
}
}
// Remove the entry if rules are empty or do not have any paths
if (it->rules.empty() || it->paths.empty()) {
it = this->Content.erase(it);
} else {
++it;
}
}
}
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