cppcheck/lib/checkinternal.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2011 Daniel Marjamäki and Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkinternal.h"
#include "symboldatabase.h"
#include <string>
#include <set>
using namespace std;
// Register this check class (by creating a static instance of it)
namespace {
CheckInternal instance;
}
void CheckInternal::checkTokenMatchPatterns()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: Match (") && !Token::simpleMatch(tok, "Token :: findmatch ("))
continue;
const std::string funcname = tok->strAt(2);
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || !Token::Match(pattern_tok, "%str%"))
continue;
const string pattern = pattern_tok->strValue();
if (pattern.empty()) {
simplePatternError(tok, pattern, funcname);
continue;
}
// Check for signs of complex patterns
if (pattern.find_first_of("[|%") != string::npos)
continue;
else if (pattern.find("!!") != string::npos)
continue;
simplePatternError(tok, pattern, funcname);
}
}
void CheckInternal::checkTokenSimpleMatchPatterns()
{
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (!Token::simpleMatch(tok, "Token :: simpleMatch (") && !Token::simpleMatch(tok, "Token :: findsimplematch ("))
continue;
const std::string funcname = tok->strAt(2);
// Get pattern string
const Token *pattern_tok = tok->tokAt(4)->nextArgument();
if (!pattern_tok || !Token::Match(pattern_tok, "%str%"))
continue;
const string pattern = pattern_tok->strValue();
if (pattern.empty()) {
complexPatternError(tok, pattern, funcname);
continue;
}
// Check for [xyz] usage - but exclude standalone square brackets
unsigned int char_count = 0;
for (string::size_type pos = 0; pos < pattern.size(); ++pos) {
unsigned char c = pattern[pos];
if (c == ' ') {
char_count = 0;
} else if (c == ']') {
if (char_count > 0) {
complexPatternError(tok, pattern, funcname);
continue;
}
} else {
++char_count;
}
}
// Check | usage: Count characters before the symbol
char_count = 0;
for (string::size_type pos = 0; pos < pattern.size(); ++pos) {
unsigned char c = pattern[pos];
if (c == ' ') {
char_count = 0;
} else if (c == '|') {
if (char_count > 0) {
complexPatternError(tok, pattern, funcname);
continue;
}
} else {
++char_count;
}
}
// Check for real errors
if (pattern.find_first_of("%") != string::npos || pattern.find("!!") != string::npos)
complexPatternError(tok, pattern, funcname);
}
}
void CheckInternal::simplePatternError(const Token* tok, const string& pattern, const std::string &funcname)
{
reportError(tok, Severity::warning, "simplePatternError",
"Found simple pattern inside Token::" + funcname + "() call: \"" + pattern + "\""
);
}
void CheckInternal::complexPatternError(const Token* tok, const string& pattern, const std::string &funcname)
{
reportError(tok, Severity::error, "complexPatternError",
"Found complex pattern inside Token::" + funcname + "() call: \"" + pattern + "\""
);
}