CMake/Source/cmGeneratorExpressionParser...

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Simplify CMake per-source license notices Per-source copyright/license notice headers that spell out copyright holder names and years are hard to maintain and often out-of-date or plain wrong. Precise contributor information is already maintained automatically by the version control tool. Ultimately it is the receiver of a file who is responsible for determining its licensing status, and per-source notices are merely a convenience. Therefore it is simpler and more accurate for each source to have a generic notice of the license name and references to more detailed information on copyright holders and full license terms. Our `Copyright.txt` file now contains a list of Contributors whose names appeared source-level copyright notices. It also references version control history for more precise information. Therefore we no longer need to spell out the list of Contributors in each source file notice. Replace CMake per-source copyright/license notice headers with a short description of the license and links to `Copyright.txt` and online information available from "https://cmake.org/licensing". The online URL also handles cases of modules being copied out of our source into other projects, so we can drop our notices about replacing links with full license text. Run the `Utilities/Scripts/filter-notices.bash` script to perform the majority of the replacements mechanically. Manually fix up shebang lines and trailing newlines in a few files. Manually update the notices in a few files that the script does not handle.
2016-09-27 22:01:08 +03:00
/* Distributed under the OSI-approved BSD 3-Clause License. See accompanying
file Copyright.txt or https://cmake.org/licensing for details. */
#include "cmGeneratorExpressionParser.h"
#include "cmGeneratorExpressionEvaluator.h"
#include <assert.h>
#include <stddef.h>
cmGeneratorExpressionParser::cmGeneratorExpressionParser(
const std::vector<cmGeneratorExpressionToken>& tokens)
: Tokens(tokens)
, NestingLevel(0)
{
}
void cmGeneratorExpressionParser::Parse(
std::vector<cmGeneratorExpressionEvaluator*>& result)
{
it = this->Tokens.begin();
while (this->it != this->Tokens.end()) {
this->ParseContent(result);
}
}
static void extendText(
std::vector<cmGeneratorExpressionEvaluator*>& result,
std::vector<cmGeneratorExpressionToken>::const_iterator it)
{
if (!result.empty() &&
(*(result.end() - 1))->GetType() ==
cmGeneratorExpressionEvaluator::Text) {
TextContent* textContent = static_cast<TextContent*>(*(result.end() - 1));
textContent->Extend(it->Length);
} else {
TextContent* textContent = new TextContent(it->Content, it->Length);
result.push_back(textContent);
}
}
static void extendResult(
std::vector<cmGeneratorExpressionEvaluator*>& result,
const std::vector<cmGeneratorExpressionEvaluator*>& contents)
{
if (!result.empty() &&
(*(result.end() - 1))->GetType() ==
cmGeneratorExpressionEvaluator::Text &&
(*contents.begin())->GetType() == cmGeneratorExpressionEvaluator::Text) {
TextContent* textContent = static_cast<TextContent*>(*(result.end() - 1));
textContent->Extend(
static_cast<TextContent*>(*contents.begin())->GetLength());
delete *contents.begin();
result.insert(result.end(), contents.begin() + 1, contents.end());
} else {
result.insert(result.end(), contents.begin(), contents.end());
}
}
void cmGeneratorExpressionParser::ParseGeneratorExpression(
std::vector<cmGeneratorExpressionEvaluator*>& result)
{
assert(this->it != this->Tokens.end());
unsigned int nestedLevel = this->NestingLevel;
++this->NestingLevel;
std::vector<cmGeneratorExpressionToken>::const_iterator startToken =
this->it - 1;
std::vector<cmGeneratorExpressionEvaluator*> identifier;
while (this->it->TokenType != cmGeneratorExpressionToken::EndExpression &&
this->it->TokenType != cmGeneratorExpressionToken::ColonSeparator) {
if (this->it->TokenType == cmGeneratorExpressionToken::CommaSeparator) {
extendText(identifier, this->it);
++this->it;
} else {
this->ParseContent(identifier);
}
if (this->it == this->Tokens.end()) {
break;
}
}
if (identifier.empty()) {
// ERROR
}
if (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::EndExpression) {
GeneratorExpressionContent* content =
new GeneratorExpressionContent(startToken->Content, this->it->Content -
startToken->Content + this->it->Length);
assert(this->it != this->Tokens.end());
++this->it;
--this->NestingLevel;
content->SetIdentifier(identifier);
result.push_back(content);
return;
}
std::vector<std::vector<cmGeneratorExpressionEvaluator*> > parameters;
std::vector<std::vector<cmGeneratorExpressionToken>::const_iterator>
commaTokens;
std::vector<cmGeneratorExpressionToken>::const_iterator colonToken;
bool emptyParamTermination = false;
if (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::ColonSeparator) {
colonToken = this->it;
parameters.resize(parameters.size() + 1);
assert(this->it != this->Tokens.end());
++this->it;
if (this->it == this->Tokens.end()) {
emptyParamTermination = true;
}
while (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::CommaSeparator) {
commaTokens.push_back(this->it);
parameters.resize(parameters.size() + 1);
assert(this->it != this->Tokens.end());
++this->it;
if (this->it == this->Tokens.end()) {
emptyParamTermination = true;
}
}
while (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::ColonSeparator) {
extendText(*(parameters.end() - 1), this->it);
assert(this->it != this->Tokens.end());
++this->it;
}
while (this->it != this->Tokens.end() &&
this->it->TokenType != cmGeneratorExpressionToken::EndExpression) {
this->ParseContent(*(parameters.end() - 1));
if (this->it == this->Tokens.end()) {
break;
}
while (this->it != this->Tokens.end() &&
this->it->TokenType ==
cmGeneratorExpressionToken::CommaSeparator) {
commaTokens.push_back(this->it);
parameters.resize(parameters.size() + 1);
assert(this->it != this->Tokens.end());
++this->it;
if (this->it == this->Tokens.end()) {
emptyParamTermination = true;
}
}
while (this->it != this->Tokens.end() &&
this->it->TokenType ==
cmGeneratorExpressionToken::ColonSeparator) {
extendText(*(parameters.end() - 1), this->it);
assert(this->it != this->Tokens.end());
++this->it;
}
}
if (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::EndExpression) {
--this->NestingLevel;
assert(this->it != this->Tokens.end());
++this->it;
}
}
if (nestedLevel != this->NestingLevel) {
// There was a '$<' in the text, but no corresponding '>'. Rebuild to
// treat the '$<' as having been plain text, along with the
// corresponding : and , tokens that might have been found.
extendText(result, startToken);
extendResult(result, identifier);
if (!parameters.empty()) {
extendText(result, colonToken);
typedef std::vector<cmGeneratorExpressionEvaluator*> EvaluatorVector;
typedef std::vector<cmGeneratorExpressionToken> TokenVector;
std::vector<EvaluatorVector>::const_iterator pit = parameters.begin();
const std::vector<EvaluatorVector>::const_iterator pend =
parameters.end();
std::vector<TokenVector::const_iterator>::const_iterator commaIt =
commaTokens.begin();
assert(parameters.size() > commaTokens.size());
for (; pit != pend; ++pit, ++commaIt) {
if (!pit->empty() && !emptyParamTermination) {
extendResult(result, *pit);
}
if (commaIt != commaTokens.end()) {
extendText(result, *commaIt);
} else {
break;
}
}
}
return;
}
size_t contentLength =
((this->it - 1)->Content - startToken->Content) + (this->it - 1)->Length;
GeneratorExpressionContent* content =
new GeneratorExpressionContent(startToken->Content, contentLength);
content->SetIdentifier(identifier);
content->SetParameters(parameters);
result.push_back(content);
}
void cmGeneratorExpressionParser::ParseContent(
std::vector<cmGeneratorExpressionEvaluator*>& result)
{
assert(this->it != this->Tokens.end());
switch (this->it->TokenType) {
case cmGeneratorExpressionToken::Text: {
if (this->NestingLevel == 0) {
if (!result.empty() &&
(*(result.end() - 1))->GetType() ==
cmGeneratorExpressionEvaluator::Text) {
// A comma in 'plain text' could have split text that should
// otherwise be continuous. Extend the last text content instead of
// creating a new one.
TextContent* textContent =
static_cast<TextContent*>(*(result.end() - 1));
textContent->Extend(this->it->Length);
assert(this->it != this->Tokens.end());
++this->it;
return;
}
}
cmGeneratorExpressionEvaluator* n =
new TextContent(this->it->Content, this->it->Length);
result.push_back(n);
assert(this->it != this->Tokens.end());
++this->it;
return;
}
case cmGeneratorExpressionToken::BeginExpression:
assert(this->it != this->Tokens.end());
++this->it;
this->ParseGeneratorExpression(result);
return;
case cmGeneratorExpressionToken::EndExpression:
case cmGeneratorExpressionToken::ColonSeparator:
case cmGeneratorExpressionToken::CommaSeparator:
if (this->NestingLevel == 0) {
extendText(result, this->it);
} else {
assert(0 && "Got unexpected syntax token.");
}
assert(this->it != this->Tokens.end());
++this->it;
return;
}
assert(0 && "Unhandled token in generator expression.");
}