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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 "cmForEachCommand.h"
#include <algorithm>
#include <cstddef>
// NOTE The declaration of `std::abs` has moved to `cmath` since C++17
// See https://en.cppreference.com/w/cpp/numeric/math/abs
// ALERT But IWYU used to lint `#include`s do not "understand"
// conditional compilation (i.e. `#if __cplusplus >= 201703L`)
#include <cstdlib>
#include <utility>
#include <cm/memory>
#include <cm/string_view>
#include "cm_static_string_view.hxx"
#include "cmExecutionStatus.h"
#include "cmFunctionBlocker.h"
#include "cmListFileCache.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmRange.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
namespace {
class cmForEachFunctionBlocker : public cmFunctionBlocker
{
public:
cmForEachFunctionBlocker(cmMakefile* mf);
~cmForEachFunctionBlocker() override;
cm::string_view StartCommandName() const override { return "foreach"_s; }
cm::string_view EndCommandName() const override { return "endforeach"_s; }
bool ArgumentsMatch(cmListFileFunction const& lff,
cmMakefile& mf) const override;
bool Replay(std::vector<cmListFileFunction> functions,
cmExecutionStatus& inStatus) override;
std::vector<std::string> Args;
private:
cmMakefile* Makefile;
};
cmForEachFunctionBlocker::cmForEachFunctionBlocker(cmMakefile* mf)
: Makefile(mf)
{
this->Makefile->PushLoopBlock();
}
cmForEachFunctionBlocker::~cmForEachFunctionBlocker()
{
this->Makefile->PopLoopBlock();
}
bool cmForEachFunctionBlocker::ArgumentsMatch(cmListFileFunction const& lff,
cmMakefile& mf) const
{
std::vector<std::string> expandedArguments;
mf.ExpandArguments(lff.Arguments, expandedArguments);
return expandedArguments.empty() ||
expandedArguments.front() == this->Args.front();
}
bool cmForEachFunctionBlocker::Replay(
std::vector<cmListFileFunction> functions, cmExecutionStatus& inStatus)
{
cmMakefile& mf = inStatus.GetMakefile();
// at end of for each execute recorded commands
// store the old value
std::string oldDef;
if (mf.GetDefinition(this->Args.front())) {
oldDef = mf.GetDefinition(this->Args.front());
}
for (std::string const& arg : cmMakeRange(this->Args).advance(1)) {
// set the variable to the loop value
mf.AddDefinition(this->Args.front(), arg);
// Invoke all the functions that were collected in the block.
for (cmListFileFunction const& func : functions) {
cmExecutionStatus status(mf);
mf.ExecuteCommand(func, status);
if (status.GetReturnInvoked()) {
inStatus.SetReturnInvoked();
// restore the variable to its prior value
mf.AddDefinition(this->Args.front(), oldDef);
return true;
}
if (status.GetBreakInvoked()) {
// restore the variable to its prior value
mf.AddDefinition(this->Args.front(), oldDef);
return true;
}
if (status.GetContinueInvoked()) {
break;
}
if (cmSystemTools::GetFatalErrorOccured()) {
return true;
}
}
}
// restore the variable to its prior value
mf.AddDefinition(this->Args.front(), oldDef);
return true;
}
bool HandleInMode(std::vector<std::string> const& args, cmMakefile& makefile)
{
auto fb = cm::make_unique<cmForEachFunctionBlocker>(&makefile);
fb->Args.push_back(args.front());
enum Doing
{
DoingNone,
DoingLists,
DoingItems
};
Doing doing = DoingNone;
for (std::string const& arg : cmMakeRange(args).advance(2)) {
if (arg == "LISTS") {
doing = DoingLists;
} else if (arg == "ITEMS") {
doing = DoingItems;
} else if (doing == DoingLists) {
auto const& value = makefile.GetSafeDefinition(arg);
if (!value.empty()) {
cmExpandList(value, fb->Args, true);
}
} else if (doing == DoingItems) {
fb->Args.push_back(arg);
} else {
makefile.IssueMessage(MessageType::FATAL_ERROR,
cmStrCat("Unknown argument:\n", " ", arg, "\n"));
return true;
}
}
makefile.AddFunctionBlocker(std::move(fb));
return true;
}
} // anonymous namespace
bool cmForEachCommand(std::vector<std::string> const& args,
cmExecutionStatus& status)
{
if (args.empty()) {
status.SetError("called with incorrect number of arguments");
return false;
}
if (args.size() > 1 && args[1] == "IN") {
return HandleInMode(args, status.GetMakefile());
}
// create a function blocker
auto fb = cm::make_unique<cmForEachFunctionBlocker>(&status.GetMakefile());
if (args.size() > 1) {
if (args[1] == "RANGE") {
int start = 0;
int stop = 0;
int step = 0;
if (args.size() == 3) {
stop = std::stoi(args[2]);
}
if (args.size() == 4) {
start = std::stoi(args[2]);
stop = std::stoi(args[3]);
}
if (args.size() == 5) {
start = std::stoi(args[2]);
stop = std::stoi(args[3]);
step = std::stoi(args[4]);
}
if (step == 0) {
if (start > stop) {
step = -1;
} else {
step = 1;
}
}
if ((start > stop && step > 0) || (start < stop && step < 0) ||
step == 0) {
status.SetError(
cmStrCat("called with incorrect range specification: start ", start,
", stop ", stop, ", step ", step));
return false;
}
// Calculate expected iterations count and reserve enough space
// in the `fb->Args` vector. The first item is the iteration variable
// name...
const std::size_t iter_cnt = 2u +
int(start < stop) * (stop - start) / std::abs(step) +
int(start > stop) * (start - stop) / std::abs(step);
fb->Args.resize(iter_cnt);
fb->Args.front() = args.front();
auto cc = start;
auto generator = [&cc, step]() -> std::string {
auto result = std::to_string(cc);
cc += step;
return result;
};
// Fill the `range` vector w/ generated string values
// (starting from 2nd position)
std::generate(++fb->Args.begin(), fb->Args.end(), generator);
} else {
fb->Args = args;
}
} else {
fb->Args = args;
}
status.GetMakefile().AddFunctionBlocker(std::move(fb));
return true;
}
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