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cmListFileCache: Convert CMake language parser to class 

Refactor the parser implementation into a class to make
it easier to extend.
This commit is contained in:
Brad King 2013-02-16 20:14:23 -05:00
parent e945949d14
commit e75b69f55b
1 changed files with 98 additions and 70 deletions
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168
Source/cmListFileCache.cxx
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@ -22,43 +22,52 @@
# pragma warn -8060 /* possibly incorrect assignment */
#endif
bool cmListFileCacheParseFunction(cmListFileLexer* lexer,
cmListFileFunction& function,
const char* filename);
bool cmListFile::ParseFile(const char* filename,
bool topLevel,
cmMakefile *mf)
//----------------------------------------------------------------------------
struct cmListFileParser
{
if(!cmSystemTools::FileExists(filename))
{
return false;
}
cmListFileParser(cmListFile* lf, cmMakefile* mf, const char* filename);
~cmListFileParser();
bool ParseFile();
bool ParseFunction(const char* name, long line);
void AddArgument(cmListFileLexer_Token* token,
cmListFileArgument::Delimiter delim);
cmListFile* ListFile;
cmMakefile* Makefile;
const char* FileName;
cmListFileLexer* Lexer;
cmListFileFunction Function;
};
// Create the scanner.
cmListFileLexer* lexer = cmListFileLexer_New();
if(!lexer)
{
cmSystemTools::Error("cmListFileCache: error allocating lexer ");
return false;
}
//----------------------------------------------------------------------------
cmListFileParser::cmListFileParser(cmListFile* lf, cmMakefile* mf,
const char* filename):
ListFile(lf), Makefile(mf), FileName(filename),
Lexer(cmListFileLexer_New())
{
}
//----------------------------------------------------------------------------
cmListFileParser::~cmListFileParser()
{
cmListFileLexer_Delete(this->Lexer);
}
//----------------------------------------------------------------------------
bool cmListFileParser::ParseFile()
{
// Open the file.
if(!cmListFileLexer_SetFileName(lexer, filename))
if(!cmListFileLexer_SetFileName(this->Lexer, this->FileName))
{
cmListFileLexer_Delete(lexer);
cmSystemTools::Error("cmListFileCache: error can not open file ",
filename);
this->FileName);
return false;
}
// Use a simple recursive-descent parser to process the token
// stream.
this->ModifiedTime = cmSystemTools::ModifiedTime(filename);
bool parseError = false;
bool haveNewline = true;
cmListFileLexer_Token* token;
while(!parseError && (token = cmListFileLexer_Scan(lexer)))
while(cmListFileLexer_Token* token =
cmListFileLexer_Scan(this->Lexer))
{
if(token->type == cmListFileLexer_Token_Newline)
{
@ -69,51 +78,66 @@ bool cmListFile::ParseFile(const char* filename,
if(haveNewline)
{
haveNewline = false;
cmListFileFunction inFunction;
inFunction.Name = token->text;
inFunction.FilePath = filename;
inFunction.Line = token->line;
if(cmListFileCacheParseFunction(lexer, inFunction, filename))
if(this->ParseFunction(token->text, token->line))
{
this->Functions.push_back(inFunction);
this->ListFile->Functions.push_back(this->Function);
}
else
{
parseError = true;
return false;
}
}
else
{
cmOStringStream error;
error << "Error in cmake code at\n"
<< filename << ":" << token->line << ":\n"
<< this->FileName << ":" << token->line << ":\n"
<< "Parse error. Expected a newline, got "
<< cmListFileLexer_GetTypeAsString(lexer, token->type)
<< cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
<< " with text \"" << token->text << "\".";
cmSystemTools::Error(error.str().c_str());
parseError = true;
return false;
}
}
else
{
cmOStringStream error;
error << "Error in cmake code at\n"
<< filename << ":" << token->line << ":\n"
<< this->FileName << ":" << token->line << ":\n"
<< "Parse error. Expected a command name, got "
<< cmListFileLexer_GetTypeAsString(lexer, token->type)
<< cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
<< " with text \""
<< token->text << "\".";
cmSystemTools::Error(error.str().c_str());
parseError = true;
return false;
}
}
if (parseError)
return true;
}
//----------------------------------------------------------------------------
bool cmListFile::ParseFile(const char* filename,
bool topLevel,
cmMakefile *mf)
{
if(!cmSystemTools::FileExists(filename))
{
return false;
}
bool parseError = false;
this->ModifiedTime = cmSystemTools::ModifiedTime(filename);
{
cmListFileParser parser(this, mf, filename);
parseError = !parser.ParseFile();
}
if(parseError)
{
this->ModifiedTime = 0;
}
cmListFileLexer_Delete(lexer);
// do we need a cmake_policy(VERSION call?
if(topLevel)
{
@ -209,17 +233,22 @@ bool cmListFile::ParseFile(const char* filename,
return true;
}
bool cmListFileCacheParseFunction(cmListFileLexer* lexer,
cmListFileFunction& function,
const char* filename)
//----------------------------------------------------------------------------
bool cmListFileParser::ParseFunction(const char* name, long line)
{
// Inintialize a new function call.
this->Function = cmListFileFunction();
this->Function.FilePath = this->FileName;
this->Function.Name = name;
this->Function.Line = line;
// Command name has already been parsed. Read the left paren.
cmListFileLexer_Token* token;
if(!(token = cmListFileLexer_Scan(lexer)))
if(!(token = cmListFileLexer_Scan(this->Lexer)))
{
cmOStringStream error;
error << "Error in cmake code at\n"
<< filename << ":" << cmListFileLexer_GetCurrentLine(lexer) << ":\n"
error << "Error in cmake code at\n" << this->FileName << ":"
<< cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
<< "Parse error. Function missing opening \"(\".";
cmSystemTools::Error(error.str().c_str());
return false;
@ -227,26 +256,24 @@ bool cmListFileCacheParseFunction(cmListFileLexer* lexer,
if(token->type != cmListFileLexer_Token_ParenLeft)
{
cmOStringStream error;
error << "Error in cmake code at\n"
<< filename << ":" << cmListFileLexer_GetCurrentLine(lexer) << ":\n"
error << "Error in cmake code at\n" << this->FileName << ":"
<< cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
<< "Parse error. Expected \"(\", got "
<< cmListFileLexer_GetTypeAsString(lexer, token->type)
<< cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
<< " with text \"" << token->text << "\".";
cmSystemTools::Error(error.str().c_str());
return false;
}
// Arguments.
unsigned long lastLine = cmListFileLexer_GetCurrentLine(lexer);
unsigned long lastLine = cmListFileLexer_GetCurrentLine(this->Lexer);
unsigned long parenDepth = 0;
while((token = cmListFileLexer_Scan(lexer)))
while((token = cmListFileLexer_Scan(this->Lexer)))
{
if(token->type == cmListFileLexer_Token_ParenLeft)
{
parenDepth++;
cmListFileArgument a("(", cmListFileArgument::Unquoted,
filename, token->line);
function.Arguments.push_back(a);
this->AddArgument(token, cmListFileArgument::Unquoted);
}
else if(token->type == cmListFileLexer_Token_ParenRight)
{
@ -255,43 +282,36 @@ bool cmListFileCacheParseFunction(cmListFileLexer* lexer,
return true;
}
parenDepth--;
cmListFileArgument a(")", cmListFileArgument::Unquoted,
filename, token->line);
function.Arguments.push_back(a);
this->AddArgument(token, cmListFileArgument::Unquoted);
}
else if(token->type == cmListFileLexer_Token_Identifier ||
token->type == cmListFileLexer_Token_ArgumentUnquoted)
{
cmListFileArgument a(token->text, cmListFileArgument::Unquoted,
filename, token->line);
function.Arguments.push_back(a);
this->AddArgument(token, cmListFileArgument::Unquoted);
}
else if(token->type == cmListFileLexer_Token_ArgumentQuoted)
{
cmListFileArgument a(token->text, cmListFileArgument::Quoted,
filename, token->line);
function.Arguments.push_back(a);
this->AddArgument(token, cmListFileArgument::Quoted);
}
else if(token->type != cmListFileLexer_Token_Newline)
{
// Error.
cmOStringStream error;
error << "Error in cmake code at\n"
<< filename << ":" << cmListFileLexer_GetCurrentLine(lexer)
<< ":\n"
error << "Error in cmake code at\n" << this->FileName << ":"
<< cmListFileLexer_GetCurrentLine(this->Lexer) << ":\n"
<< "Parse error. Function missing ending \")\". "
<< "Instead found "
<< cmListFileLexer_GetTypeAsString(lexer, token->type)
<< cmListFileLexer_GetTypeAsString(this->Lexer, token->type)
<< " with text \"" << token->text << "\".";
cmSystemTools::Error(error.str().c_str());
return false;
}
lastLine = cmListFileLexer_GetCurrentLine(lexer);
lastLine = cmListFileLexer_GetCurrentLine(this->Lexer);
}
cmOStringStream error;
error << "Error in cmake code at\n"
<< filename << ":" << lastLine << ":\n"
<< this->FileName << ":" << lastLine << ":\n"
<< "Parse error. Function missing ending \")\". "
<< "End of file reached.";
cmSystemTools::Error(error.str().c_str());
@ -299,6 +319,14 @@ bool cmListFileCacheParseFunction(cmListFileLexer* lexer,
return false;
}
//----------------------------------------------------------------------------
void cmListFileParser::AddArgument(cmListFileLexer_Token* token,
cmListFileArgument::Delimiter delim)
{
cmListFileArgument a(token->text, delim, this->FileName, token->line);
this->Function.Arguments.push_back(a);
}
//----------------------------------------------------------------------------
std::ostream& operator<<(std::ostream& os, cmListFileContext const& lfc)
{