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/*============================================================================
CMake - Cross Platform Makefile Generator
Copyright 2012 Stephen Kelly <steveire@gmail.com>
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 "cmGeneratorExpressionParser.h"
#include "cmGeneratorExpressionEvaluator.h"
#include "assert.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.size() > 0
&& (*(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.size() > 0
&& (*(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)
{
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);
++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;
if (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::ColonSeparator)
{
colonToken = this->it;
parameters.resize(parameters.size() + 1);
++this->it;
while (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::CommaSeparator)
{
commaTokens.push_back(this->it);
parameters.resize(parameters.size() + 1);
++this->it;
}
while (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::ColonSeparator)
{
extendText(*(parameters.end() - 1), this->it);
++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);
++this->it;
}
while (this->it != this->Tokens.end() &&
this->it->TokenType == cmGeneratorExpressionToken::ColonSeparator)
{
extendText(*(parameters.end() - 1), this->it);
++this->it;
}
}
if(this->it != this->Tokens.end()
&& this->it->TokenType == cmGeneratorExpressionToken::EndExpression)
{
--this->NestingLevel;
++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();
for ( ; pit != pend; ++pit, ++commaIt)
{
extendResult(result, *pit);
if (commaIt != commaTokens.end())
{
extendText(result, *commaIt);
}
else
{
break;
}
}
}
return;
}
int 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.size() > 0
&& (*(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);
++this->it;
return;
}
}
cmGeneratorExpressionEvaluator* n = new TextContent(this->it->Content,
this->it->Length);
result.push_back(n);
++this->it;
return ;
}
case cmGeneratorExpressionToken::BeginExpression:
++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(!"Got unexpected syntax token.");
}
++this->it;
return;
}
assert(!"Unhandled token in generator expression.");
}
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