https://github.com/Kitware/CMake
Tip revision: e647949539f4704a00eddac2357d59ceeb8bc0ca authored by Brad King on 28 May 2020, 10:57:26 UTC
CMake 3.17.3
CMake 3.17.3
Tip revision: e647949
cmCommandArgumentParserHelper.cxx
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmCommandArgumentParserHelper.h"
#include <cstring>
#include <iostream>
#include <sstream>
#include "cmCommandArgumentLexer.h"
#include "cmMakefile.h"
#include "cmState.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
int cmCommandArgument_yyparse(yyscan_t yyscanner);
//
cmCommandArgumentParserHelper::cmCommandArgumentParserHelper()
{
this->FileLine = -1;
this->FileName = nullptr;
this->RemoveEmpty = true;
this->NoEscapeMode = false;
this->ReplaceAtSyntax = false;
}
cmCommandArgumentParserHelper::~cmCommandArgumentParserHelper()
{
this->CleanupParser();
}
void cmCommandArgumentParserHelper::SetLineFile(long line, const char* file)
{
this->FileLine = line;
this->FileName = file;
}
const char* cmCommandArgumentParserHelper::AddString(const std::string& str)
{
if (str.empty()) {
return "";
}
char* stVal = new char[str.size() + 1];
strcpy(stVal, str.c_str());
this->Variables.push_back(stVal);
return stVal;
}
const char* cmCommandArgumentParserHelper::ExpandSpecialVariable(
const char* key, const char* var)
{
if (!key) {
return this->ExpandVariable(var);
}
if (!var) {
return "";
}
if (strcmp(key, "ENV") == 0) {
std::string str;
if (cmSystemTools::GetEnv(var, str)) {
if (this->EscapeQuotes) {
return this->AddString(cmEscapeQuotes(str));
}
return this->AddString(str);
}
return "";
}
if (strcmp(key, "CACHE") == 0) {
if (const std::string* c =
this->Makefile->GetState()->GetInitializedCacheValue(var)) {
if (this->EscapeQuotes) {
return this->AddString(cmEscapeQuotes(*c));
}
return this->AddString(*c);
}
return "";
}
std::ostringstream e;
e << "Syntax $" << key << "{} is not supported. "
<< "Only ${}, $ENV{}, and $CACHE{} are allowed.";
this->SetError(e.str());
return nullptr;
}
const char* cmCommandArgumentParserHelper::ExpandVariable(const char* var)
{
if (!var) {
return nullptr;
}
if (this->FileLine >= 0 && strcmp(var, "CMAKE_CURRENT_LIST_LINE") == 0) {
return this->AddString(std::to_string(this->FileLine));
}
const char* value = this->Makefile->GetDefinition(var);
if (!value) {
this->Makefile->MaybeWarnUninitialized(var, this->FileName);
if (!this->RemoveEmpty) {
return nullptr;
}
}
if (this->EscapeQuotes && value) {
return this->AddString(cmEscapeQuotes(value));
}
return this->AddString(value ? value : "");
}
const char* cmCommandArgumentParserHelper::ExpandVariableForAt(const char* var)
{
if (this->ReplaceAtSyntax) {
// try to expand the variable
const char* ret = this->ExpandVariable(var);
// if the return was 0 and we want to replace empty strings
// then return an empty string
if (!ret && this->RemoveEmpty) {
return this->AddString("");
}
// if the ret was not 0, then return it
if (ret) {
return ret;
}
}
// at this point we want to put it back because of one of these cases:
// - this->ReplaceAtSyntax is false
// - this->ReplaceAtSyntax is true, but this->RemoveEmpty is false,
// and the variable was not defined
std::string ref = cmStrCat('@', var, '@');
return this->AddString(ref);
}
const char* cmCommandArgumentParserHelper::CombineUnions(const char* in1,
const char* in2)
{
if (!in1) {
return in2;
}
if (!in2) {
return in1;
}
size_t len = strlen(in1) + strlen(in2) + 1;
char* out = new char[len];
strcpy(out, in1);
strcat(out, in2);
this->Variables.push_back(out);
return out;
}
void cmCommandArgumentParserHelper::AllocateParserType(
cmCommandArgumentParserHelper::ParserType* pt, const char* str, int len)
{
pt->str = nullptr;
if (len == 0) {
len = static_cast<int>(strlen(str));
}
if (len == 0) {
return;
}
char* out = new char[len + 1];
memcpy(out, str, len);
out[len] = 0;
pt->str = out;
this->Variables.push_back(out);
}
bool cmCommandArgumentParserHelper::HandleEscapeSymbol(
cmCommandArgumentParserHelper::ParserType* pt, char symbol)
{
switch (symbol) {
case '\\':
case '"':
case ' ':
case '#':
case '(':
case ')':
case '$':
case '@':
case '^':
this->AllocateParserType(pt, &symbol, 1);
break;
case ';':
this->AllocateParserType(pt, "\\;", 2);
break;
case 't':
this->AllocateParserType(pt, "\t", 1);
break;
case 'n':
this->AllocateParserType(pt, "\n", 1);
break;
case 'r':
this->AllocateParserType(pt, "\r", 1);
break;
case '0':
this->AllocateParserType(pt, "\0", 1);
break;
default: {
std::ostringstream e;
e << "Invalid escape sequence \\" << symbol;
this->SetError(e.str());
}
return false;
}
return true;
}
void cmCommandArgument_SetupEscapes(yyscan_t yyscanner, bool noEscapes);
int cmCommandArgumentParserHelper::ParseString(const char* str, int verb)
{
if (!str) {
return 0;
}
this->Verbose = verb;
this->InputBuffer = str;
this->InputBufferPos = 0;
this->CurrentLine = 0;
this->Result.clear();
yyscan_t yyscanner;
cmCommandArgument_yylex_init(&yyscanner);
cmCommandArgument_yyset_extra(this, yyscanner);
cmCommandArgument_SetupEscapes(yyscanner, this->NoEscapeMode);
int res = cmCommandArgument_yyparse(yyscanner);
cmCommandArgument_yylex_destroy(yyscanner);
if (res != 0) {
return 0;
}
this->CleanupParser();
if (Verbose) {
std::cerr << "Expanding [" << str << "] produced: [" << this->Result << "]"
<< std::endl;
}
return 1;
}
void cmCommandArgumentParserHelper::CleanupParser()
{
for (char* var : this->Variables) {
delete[] var;
}
this->Variables.erase(this->Variables.begin(), this->Variables.end());
}
int cmCommandArgumentParserHelper::LexInput(char* buf, int maxlen)
{
if (maxlen < 1) {
return 0;
}
if (this->InputBufferPos < this->InputBuffer.size()) {
buf[0] = this->InputBuffer[this->InputBufferPos++];
if (buf[0] == '\n') {
this->CurrentLine++;
}
return (1);
}
buf[0] = '\n';
return (0);
}
void cmCommandArgumentParserHelper::Error(const char* str)
{
unsigned long pos = static_cast<unsigned long>(this->InputBufferPos);
std::ostringstream ostr;
ostr << str << " (" << pos << ")";
this->SetError(ostr.str());
}
void cmCommandArgumentParserHelper::SetMakefile(const cmMakefile* mf)
{
this->Makefile = mf;
}
void cmCommandArgumentParserHelper::SetResult(const char* value)
{
if (!value) {
this->Result.clear();
return;
}
this->Result = value;
}
void cmCommandArgumentParserHelper::SetError(std::string const& msg)
{
// Keep only the first error.
if (this->ErrorString.empty()) {
this->ErrorString = msg;
}
}