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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 "cmGeneratorExpressionParser.h"
#include "cmAlgorithms.h"
#include "cmGeneratorExpressionEvaluator.h"
#include <assert.h>
#include <stddef.h>
#include <utility>
cmGeneratorExpressionParser::cmGeneratorExpressionParser(
std::vector<cmGeneratorExpressionToken> tokens)
: Tokens(std::move(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.front()->GetType() == cmGeneratorExpressionEvaluator::Text) {
TextContent* textContent = static_cast<TextContent*>(*(result.end() - 1));
textContent->Extend(
static_cast<TextContent*>(contents.front())->GetLength());
delete contents.front();
cmAppend(result, contents.begin() + 1, contents.end());
} else {
cmAppend(result, contents);
}
}
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(std::move(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);
using EvaluatorVector = std::vector<cmGeneratorExpressionEvaluator*>;
using TokenVector = std::vector<cmGeneratorExpressionToken>;
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(std::move(identifier));
content->SetParameters(std::move(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(false && "Got unexpected syntax token.");
}
assert(this->it != this->Tokens.end());
++this->it;
return;
}
assert(false && "Unhandled token in generator expression.");
}
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