CMake/Source/cmConditionEvaluator.cxx

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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2014 Kitware, Inc., Insight Software Consortium
Distributed under the OSI-approved BSD License (the "License");
see accompanying file Copyright.txt for details.
This software is distributed WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the License for more information.
============================================================================*/
#include "cmConditionEvaluator.h"
cmConditionEvaluator::cmConditionEvaluator(cmMakefile& makefile):
Makefile(makefile),
Policy12Status(makefile.GetPolicyStatus(cmPolicies::CMP0012)),
Policy54Status(makefile.GetPolicyStatus(cmPolicies::CMP0054))
{
}
//=========================================================================
// order of operations,
// 1. ( ) -- parenthetical groups
// 2. IS_DIRECTORY EXISTS COMMAND DEFINED etc predicates
// 3. MATCHES LESS GREATER EQUAL STRLESS STRGREATER STREQUAL etc binary ops
// 4. NOT
// 5. AND OR
//
// There is an issue on whether the arguments should be values of references,
// for example IF (FOO AND BAR) should that compare the strings FOO and BAR
// or should it really do IF (${FOO} AND ${BAR}) Currently IS_DIRECTORY
// EXISTS COMMAND and DEFINED all take values. EQUAL, LESS and GREATER can
// take numeric values or variable names. STRLESS and STRGREATER take
// variable names but if the variable name is not found it will use the name
// directly. AND OR take variables or the values 0 or 1.
bool cmConditionEvaluator::IsTrue(
const std::vector<cmExpandedCommandArgument> &args,
std::string &errorString,
cmake::MessageType &status)
{
errorString = "";
// handle empty invocation
if (args.size() < 1)
{
return false;
}
// store the reduced args in this vector
cmArgumentList newArgs;
// copy to the list structure
newArgs.insert(newArgs.end(), args.begin(), args.end());
// now loop through the arguments and see if we can reduce any of them
// we do this multiple times. Once for each level of precedence
// parens
if (!this->HandleLevel0(newArgs, errorString, status))
{
return false;
}
//predicates
if (!this->HandleLevel1(newArgs, errorString, status))
{
return false;
}
// binary ops
if (!this->HandleLevel2(newArgs, errorString, status))
{
return false;
}
// NOT
if (!this->HandleLevel3(newArgs, errorString, status))
{
return false;
}
// AND OR
if (!this->HandleLevel4(newArgs, errorString, status))
{
return false;
}
// now at the end there should only be one argument left
if (newArgs.size() != 1)
{
errorString = "Unknown arguments specified";
status = cmake::FATAL_ERROR;
return false;
}
return this->GetBooleanValueWithAutoDereference(*(newArgs.begin()),
errorString, status, true);
}
//=========================================================================
const char* cmConditionEvaluator::GetDefinitionIfUnquoted(
cmExpandedCommandArgument const& argument) const
{
if((this->Policy54Status != cmPolicies::WARN &&
this->Policy54Status != cmPolicies::OLD) &&
argument.WasQuoted())
{
return 0;
}
const char* def = this->Makefile.GetDefinition(argument.GetValue());
if(def && argument.WasQuoted() && this->Policy54Status == cmPolicies::WARN)
{
bool hasBeenReported = this->Makefile.HasCMP0054AlreadyBeenReported(
this->Makefile.GetBacktrace()[0]);
if(!hasBeenReported)
{
std::ostringstream e;
e << (this->Makefile.GetPolicies()->GetPolicyWarning(
cmPolicies::CMP0054)) << "\n";
e << "Quoted variables like \"" << argument.GetValue() <<
"\" will no longer be dereferenced "
"when the policy is set to NEW. "
"Since the policy is not set the OLD behavior will be used.";
this->Makefile.IssueMessage(cmake::AUTHOR_WARNING, e.str());
}
}
return def;
}
//=========================================================================
const char* cmConditionEvaluator::GetVariableOrString(
const cmExpandedCommandArgument& argument) const
{
const char* def = this->GetDefinitionIfUnquoted(argument);
if(!def)
{
def = argument.c_str();
}
return def;
}
//=========================================================================
bool cmConditionEvaluator::IsKeyword(std::string const& keyword,
cmExpandedCommandArgument& argument) const
{
if((this->Policy54Status != cmPolicies::WARN &&
this->Policy54Status != cmPolicies::OLD) &&
argument.WasQuoted())
{
return false;
}
bool isKeyword = argument.GetValue() == keyword;
if(isKeyword && argument.WasQuoted() &&
this->Policy54Status == cmPolicies::WARN)
{
bool hasBeenReported = this->Makefile.HasCMP0054AlreadyBeenReported(
this->Makefile.GetBacktrace()[0]);
if(!hasBeenReported)
{
std::ostringstream e;
e << (this->Makefile.GetPolicies()->GetPolicyWarning(
cmPolicies::CMP0054)) << "\n";
e << "Quoted keywords like \"" << argument.GetValue() <<
"\" will no longer be interpreted as keywords "
"when the policy is set to NEW. "
"Since the policy is not set the OLD behavior will be used.";
this->Makefile.IssueMessage(cmake::AUTHOR_WARNING, e.str());
}
}
return isKeyword;
}
//=========================================================================
bool cmConditionEvaluator::GetBooleanValue(
cmExpandedCommandArgument& arg) const
{
// Check basic constants.
if (arg == "0")
{
return false;
}
if (arg == "1")
{
return true;
}
// Check named constants.
if (cmSystemTools::IsOn(arg.c_str()))
{
return true;
}
if (cmSystemTools::IsOff(arg.c_str()))
{
return false;
}
// Check for numbers.
if(!arg.empty())
{
char* end;
double d = strtod(arg.c_str(), &end);
if(*end == '\0')
{
// The whole string is a number. Use C conversion to bool.
return d? true:false;
}
}
// Check definition.
const char* def = this->GetDefinitionIfUnquoted(arg);
return !cmSystemTools::IsOff(def);
}
//=========================================================================
// Boolean value behavior from CMake 2.6.4 and below.
bool cmConditionEvaluator::GetBooleanValueOld(
cmExpandedCommandArgument const& arg, bool one) const
{
if(one)
{
// Old IsTrue behavior for single argument.
if(arg == "0")
{ return false; }
else if(arg == "1")
{ return true; }
else
{
const char* def = this->GetDefinitionIfUnquoted(arg);
return !cmSystemTools::IsOff(def);
}
}
else
{
// Old GetVariableOrNumber behavior.
const char* def = this->GetDefinitionIfUnquoted(arg);
if(!def && atoi(arg.c_str()))
{
def = arg.c_str();
}
return !cmSystemTools::IsOff(def);
}
}
//=========================================================================
// returns the resulting boolean value
bool cmConditionEvaluator::GetBooleanValueWithAutoDereference(
cmExpandedCommandArgument &newArg,
std::string &errorString,
cmake::MessageType &status,
bool oneArg) const
{
// Use the policy if it is set.
if (this->Policy12Status == cmPolicies::NEW)
{
return GetBooleanValue(newArg);
}
else if (this->Policy12Status == cmPolicies::OLD)
{
return GetBooleanValueOld(newArg, oneArg);
}
// Check policy only if old and new results differ.
bool newResult = this->GetBooleanValue(newArg);
bool oldResult = this->GetBooleanValueOld(newArg, oneArg);
if(newResult != oldResult)
{
switch(this->Policy12Status)
{
case cmPolicies::WARN:
{
cmPolicies* policies = this->Makefile.GetPolicies();
errorString = "An argument named \"" + newArg.GetValue()
+ "\" appears in a conditional statement. "
+ policies->GetPolicyWarning(cmPolicies::CMP0012);
status = cmake::AUTHOR_WARNING;
}
case cmPolicies::OLD:
return oldResult;
case cmPolicies::REQUIRED_IF_USED:
case cmPolicies::REQUIRED_ALWAYS:
{
cmPolicies* policies = this->Makefile.GetPolicies();
errorString = "An argument named \"" + newArg.GetValue()
+ "\" appears in a conditional statement. "
+ policies->GetRequiredPolicyError(cmPolicies::CMP0012);
status = cmake::FATAL_ERROR;
}
case cmPolicies::NEW:
break;
}
}
return newResult;
}
//=========================================================================
void cmConditionEvaluator::IncrementArguments(cmArgumentList &newArgs,
cmArgumentList::iterator &argP1,
cmArgumentList::iterator &argP2) const
{
if (argP1 != newArgs.end())
{
argP1++;
argP2 = argP1;
if (argP1 != newArgs.end())
{
argP2++;
}
}
}
//=========================================================================
// helper function to reduce code duplication
void cmConditionEvaluator::HandlePredicate(bool value, int &reducible,
cmArgumentList::iterator &arg,
cmArgumentList &newArgs,
cmArgumentList::iterator &argP1,
cmArgumentList::iterator &argP2) const
{
if(value)
{
*arg = cmExpandedCommandArgument("1", true);
}
else
{
*arg = cmExpandedCommandArgument("0", true);
}
newArgs.erase(argP1);
argP1 = arg;
this->IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
//=========================================================================
// helper function to reduce code duplication
void cmConditionEvaluator::HandleBinaryOp(bool value, int &reducible,
cmArgumentList::iterator &arg,
cmArgumentList &newArgs,
cmArgumentList::iterator &argP1,
cmArgumentList::iterator &argP2)
{
if(value)
{
*arg = cmExpandedCommandArgument("1", true);
}
else
{
*arg = cmExpandedCommandArgument("0", true);
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
this->IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
//=========================================================================
// level 0 processes parenthetical expressions
bool cmConditionEvaluator::HandleLevel0(cmArgumentList &newArgs,
std::string &errorString,
cmake::MessageType &status)
{
int reducible;
do
{
reducible = 0;
cmArgumentList::iterator arg = newArgs.begin();
while (arg != newArgs.end())
{
if (IsKeyword("(", *arg))
{
// search for the closing paren for this opening one
cmArgumentList::iterator argClose;
argClose = arg;
argClose++;
unsigned int depth = 1;
while (argClose != newArgs.end() && depth)
{
if (this->IsKeyword("(", *argClose))
{
depth++;
}
if (this->IsKeyword(")", *argClose))
{
depth--;
}
argClose++;
}
if (depth)
{
errorString = "mismatched parenthesis in condition";
status = cmake::FATAL_ERROR;
return false;
}
// store the reduced args in this vector
std::vector<cmExpandedCommandArgument> newArgs2;
// copy to the list structure
cmArgumentList::iterator argP1 = arg;
argP1++;
newArgs2.insert(newArgs2.end(), argP1, argClose);
newArgs2.pop_back();
// now recursively invoke IsTrue to handle the values inside the
// parenthetical expression
bool value =
this->IsTrue(newArgs2, errorString, status);
if(value)
{
*arg = cmExpandedCommandArgument("1", true);
}
else
{
*arg = cmExpandedCommandArgument("0", true);
}
argP1 = arg;
argP1++;
// remove the now evaluated parenthetical expression
newArgs.erase(argP1,argClose);
}
++arg;
}
}
while (reducible);
return true;
}
//=========================================================================
// level one handles most predicates except for NOT
bool cmConditionEvaluator::HandleLevel1(cmArgumentList &newArgs,
std::string &, cmake::MessageType &)
{
int reducible;
do
{
reducible = 0;
cmArgumentList::iterator arg = newArgs.begin();
cmArgumentList::iterator argP1;
cmArgumentList::iterator argP2;
while (arg != newArgs.end())
{
argP1 = arg;
this->IncrementArguments(newArgs,argP1,argP2);
// does a file exist
if (this->IsKeyword("EXISTS", *arg) && argP1 != newArgs.end())
{
this->HandlePredicate(
cmSystemTools::FileExists(argP1->c_str()),
reducible, arg, newArgs, argP1, argP2);
}
// does a directory with this name exist
if (this->IsKeyword("IS_DIRECTORY", *arg) && argP1 != newArgs.end())
{
this->HandlePredicate(
cmSystemTools::FileIsDirectory(argP1->c_str()),
reducible, arg, newArgs, argP1, argP2);
}
// does a symlink with this name exist
if (this->IsKeyword("IS_SYMLINK", *arg) && argP1 != newArgs.end())
{
this->HandlePredicate(
cmSystemTools::FileIsSymlink(argP1->c_str()),
reducible, arg, newArgs, argP1, argP2);
}
// is the given path an absolute path ?
if (this->IsKeyword("IS_ABSOLUTE", *arg) && argP1 != newArgs.end())
{
this->HandlePredicate(
cmSystemTools::FileIsFullPath(argP1->c_str()),
reducible, arg, newArgs, argP1, argP2);
}
// does a command exist
if (this->IsKeyword("COMMAND", *arg) && argP1 != newArgs.end())
{
this->HandlePredicate(
this->Makefile.CommandExists(argP1->c_str()),
reducible, arg, newArgs, argP1, argP2);
}
// does a policy exist
if (this->IsKeyword("POLICY", *arg) && argP1 != newArgs.end())
{
cmPolicies::PolicyID pid;
this->HandlePredicate(
this->Makefile.GetPolicies()->GetPolicyID(
argP1->c_str(), pid),
reducible, arg, newArgs, argP1, argP2);
}
// does a target exist
if (this->IsKeyword("TARGET", *arg) && argP1 != newArgs.end())
{
this->HandlePredicate(
this->Makefile.FindTargetToUse(argP1->GetValue())?true:false,
reducible, arg, newArgs, argP1, argP2);
}
// is a variable defined
if (this->IsKeyword("DEFINED", *arg) && argP1 != newArgs.end())
{
size_t argP1len = argP1->GetValue().size();
bool bdef = false;
if(argP1len > 4 && argP1->GetValue().substr(0, 4) == "ENV{" &&
argP1->GetValue().operator[](argP1len-1) == '}')
{
std::string env = argP1->GetValue().substr(4, argP1len-5);
bdef = cmSystemTools::GetEnv(env.c_str())?true:false;
}
else
{
bdef = this->Makefile.IsDefinitionSet(argP1->GetValue());
}
this->HandlePredicate(bdef, reducible, arg, newArgs, argP1, argP2);
}
++arg;
}
}
while (reducible);
return true;
}
//=========================================================================
// level two handles most binary operations except for AND OR
bool cmConditionEvaluator::HandleLevel2(cmArgumentList &newArgs,
std::string &errorString,
cmake::MessageType &status)
{
int reducible;
const char *def;
const char *def2;
do
{
reducible = 0;
cmArgumentList::iterator arg = newArgs.begin();
cmArgumentList::iterator argP1;
cmArgumentList::iterator argP2;
while (arg != newArgs.end())
{
argP1 = arg;
this->IncrementArguments(newArgs,argP1,argP2);
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
IsKeyword("MATCHES", *argP1))
{
def = this->GetVariableOrString(*arg);
const char* rex = argP2->c_str();
this->Makefile.ClearMatches();
cmsys::RegularExpression regEntry;
if ( !regEntry.compile(rex) )
{
std::ostringstream error;
error << "Regular expression \"" << rex << "\" cannot compile";
errorString = error.str();
status = cmake::FATAL_ERROR;
return false;
}
if (regEntry.find(def))
{
this->Makefile.StoreMatches(regEntry);
*arg = cmExpandedCommandArgument("1", true);
}
else
{
*arg = cmExpandedCommandArgument("0", true);
}
newArgs.erase(argP2);
newArgs.erase(argP1);
argP1 = arg;
this->IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
if (argP1 != newArgs.end() && this->IsKeyword("MATCHES", *arg))
{
*arg = cmExpandedCommandArgument("0", true);
newArgs.erase(argP1);
argP1 = arg;
this->IncrementArguments(newArgs,argP1,argP2);
reducible = 1;
}
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
(this->IsKeyword("LESS", *argP1) ||
this->IsKeyword("GREATER", *argP1) ||
this->IsKeyword("EQUAL", *argP1)))
{
def = this->GetVariableOrString(*arg);
def2 = this->GetVariableOrString(*argP2);
double lhs;
double rhs;
bool result;
if(sscanf(def, "%lg", &lhs) != 1 ||
sscanf(def2, "%lg", &rhs) != 1)
{
result = false;
}
else if (*(argP1) == "LESS")
{
result = (lhs < rhs);
}
else if (*(argP1) == "GREATER")
{
result = (lhs > rhs);
}
else
{
result = (lhs == rhs);
}
this->HandleBinaryOp(result,
reducible, arg, newArgs, argP1, argP2);
}
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
(this->IsKeyword("STRLESS", *argP1) ||
this->IsKeyword("STREQUAL", *argP1) ||
this->IsKeyword("STRGREATER", *argP1)))
{
def = this->GetVariableOrString(*arg);
def2 = this->GetVariableOrString(*argP2);
int val = strcmp(def,def2);
bool result;
if (*(argP1) == "STRLESS")
{
result = (val < 0);
}
else if (*(argP1) == "STRGREATER")
{
result = (val > 0);
}
else // strequal
{
result = (val == 0);
}
this->HandleBinaryOp(result,
reducible, arg, newArgs, argP1, argP2);
}
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
(this->IsKeyword("VERSION_LESS", *argP1) ||
this->IsKeyword("VERSION_GREATER", *argP1) ||
this->IsKeyword("VERSION_EQUAL", *argP1)))
{
def = this->GetVariableOrString(*arg);
def2 = this->GetVariableOrString(*argP2);
cmSystemTools::CompareOp op = cmSystemTools::OP_EQUAL;
if(*argP1 == "VERSION_LESS")
{
op = cmSystemTools::OP_LESS;
}
else if(*argP1 == "VERSION_GREATER")
{
op = cmSystemTools::OP_GREATER;
}
bool result = cmSystemTools::VersionCompare(op, def, def2);
this->HandleBinaryOp(result,
reducible, arg, newArgs, argP1, argP2);
}
// is file A newer than file B
if (argP1 != newArgs.end() && argP2 != newArgs.end() &&
this->IsKeyword("IS_NEWER_THAN", *argP1))
{
int fileIsNewer=0;
bool success=cmSystemTools::FileTimeCompare(arg->GetValue(),
(argP2)->GetValue(),
&fileIsNewer);
this->HandleBinaryOp(
(success==false || fileIsNewer==1 || fileIsNewer==0),
reducible, arg, newArgs, argP1, argP2);
}
++arg;
}
}
while (reducible);
return true;
}
//=========================================================================
// level 3 handles NOT
bool cmConditionEvaluator::HandleLevel3(cmArgumentList &newArgs,
std::string &errorString,
cmake::MessageType &status)
{
int reducible;
do
{
reducible = 0;
cmArgumentList::iterator arg = newArgs.begin();
cmArgumentList::iterator argP1;
cmArgumentList::iterator argP2;
while (arg != newArgs.end())
{
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
if (argP1 != newArgs.end() && IsKeyword("NOT", *arg))
{
bool rhs = this->GetBooleanValueWithAutoDereference(*argP1,
errorString,
status);
this->HandlePredicate(!rhs, reducible, arg, newArgs, argP1, argP2);
}
++arg;
}
}
while (reducible);
return true;
}
//=========================================================================
// level 4 handles AND OR
bool cmConditionEvaluator::HandleLevel4(cmArgumentList &newArgs,
std::string &errorString,
cmake::MessageType &status)
{
int reducible;
bool lhs;
bool rhs;
do
{
reducible = 0;
cmArgumentList::iterator arg = newArgs.begin();
cmArgumentList::iterator argP1;
cmArgumentList::iterator argP2;
while (arg != newArgs.end())
{
argP1 = arg;
IncrementArguments(newArgs,argP1,argP2);
if (argP1 != newArgs.end() && IsKeyword("AND", *argP1) &&
argP2 != newArgs.end())
{
lhs = this->GetBooleanValueWithAutoDereference(*arg,
errorString,
status);
rhs = this->GetBooleanValueWithAutoDereference(*argP2,
errorString,
status);
this->HandleBinaryOp((lhs && rhs),
reducible, arg, newArgs, argP1, argP2);
}
if (argP1 != newArgs.end() && this->IsKeyword("OR", *argP1) &&
argP2 != newArgs.end())
{
lhs = this->GetBooleanValueWithAutoDereference(*arg,
errorString,
status);
rhs = this->GetBooleanValueWithAutoDereference(*argP2,
errorString,
status);
this->HandleBinaryOp((lhs || rhs),
reducible, arg, newArgs, argP1, argP2);
}
++arg;
}
}
while (reducible);
return true;
}