cppcheck/lib/token.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2012 Daniel Marjamäki and Cppcheck team.
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*
* 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/>.
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*/
#include "token.h"
#include "errorlogger.h"
#include "check.h"
#include <cassert>
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#include <cstdlib>
#include <cstring>
#include <string>
#include <iostream>
#include <cctype>
#include <sstream>
#include <map>
Token::Token(Token **t) :
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tokensBack(t),
_next(0),
_previous(0),
_link(0),
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_isName(false),
_isNumber(false),
_isBoolean(false),
_isUnsigned(false),
_isSigned(false),
_isPointerCompare(false),
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_isLong(false),
_isUnused(false),
_isStandardType(false),
_isExpandedMacro(false),
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_varId(0),
_fileIndex(0),
_linenr(0),
_progressValue(0),
_str("")
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{
}
Token::~Token()
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{
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}
void Token::update_property_info()
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{
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if (!_str.empty()) {
_isName = bool(_str[0] == '_' || std::isalpha(_str[0]));
if (std::isdigit(_str[0]))
_isNumber = true;
else if (_str.length() > 1 && _str[0] == '-' && std::isdigit(_str[1]))
_isNumber = true;
else
_isNumber = false;
_isBoolean = (_str == "true" || _str == "false");
} else {
_isName = false;
_isNumber = false;
_isBoolean = false;
}
update_property_isStandardType();
}
void Token::update_property_isStandardType()
{
_isStandardType = false;
if (_str.size() < 3)
return;
static const char * const type[] = {"int", "char", "bool", "long", "short", "float", "double", "size_t", 0};
for (int i = 0; type[i]; i++) {
if (_str == type[i]) {
_isStandardType = true;
break;
}
}
}
void Token::str(const std::string &s)
{
_str = s;
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_varId = 0;
update_property_info();
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}
void Token::concatStr(std::string const& b)
{
_str.erase(_str.length() - 1);
_str.append(b.begin() + 1, b.end());
update_property_info();
}
std::string Token::strValue() const
{
assert(_str.length() >= 2);
assert(_str[0] == '"');
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assert(_str[_str.length()-1] == '"');
return _str.substr(1, _str.length() - 2);
}
void Token::deleteNext(unsigned long index)
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{
while (_next && index--) {
Token *n = _next;
_next = n->next();
delete n;
}
if (_next)
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_next->previous(this);
else if (tokensBack)
*tokensBack = this;
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}
void Token::deleteThis()
{
if (_next) { // Copy next to this and delete next
_str = _next->_str;
_isName = _next->_isName;
_isNumber = _next->_isNumber;
_isBoolean = _next->_isBoolean;
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_isUnsigned = _next->_isUnsigned;
_isSigned = _next->_isSigned;
_isPointerCompare = _next->_isPointerCompare;
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_isLong = _next->_isLong;
_isUnused = _next->_isUnused;
_isStandardType = _next->_isStandardType;
_isExpandedMacro = _next->_isExpandedMacro;
_varId = _next->_varId;
_fileIndex = _next->_fileIndex;
_linenr = _next->_linenr;
_link = _next->_link;
if (_link)
_link->link(this);
deleteNext();
} else if (_previous && _previous->_previous) { // Copy previous to this and delete previous
_str = _previous->_str;
_isName = _previous->_isName;
_isNumber = _previous->_isNumber;
_isBoolean = _previous->_isBoolean;
_isUnsigned = _previous->_isUnsigned;
_isSigned = _previous->_isSigned;
_isPointerCompare = _previous->_isPointerCompare;
_isLong = _previous->_isLong;
_isUnused = _previous->_isUnused;
_isStandardType = _previous->_isStandardType;
_isExpandedMacro = _previous->_isExpandedMacro;
_varId = _previous->_varId;
_fileIndex = _previous->_fileIndex;
_linenr = _previous->_linenr;
_link = _previous->_link;
if (_link)
_link->link(this);
Token* toDelete = _previous;
_previous = _previous->_previous;
_previous->_next = this;
delete toDelete;
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} else {
// We are the last token in the list, we can't delete
// ourselves, so just make us empty
str("");
}
}
void Token::replace(Token *replaceThis, Token *start, Token *end)
{
// Fix the whole in the old location of start and end
if (start->previous())
start->previous()->next(end->next());
if (end->next())
end->next()->previous(start->previous());
// Move start and end to their new location
if (replaceThis->previous())
replaceThis->previous()->next(start);
if (replaceThis->next())
replaceThis->next()->previous(end);
start->previous(replaceThis->previous());
end->next(replaceThis->next());
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if (end->tokensBack && *(end->tokensBack) == end) {
while (end->next())
end = end->next();
*(end->tokensBack) = end;
}
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// Update _progressValue, fileIndex and linenr
for (Token *tok = start; tok != end->next(); tok = tok->next())
tok->_progressValue = replaceThis->_progressValue;
// Delete old token, which is replaced
delete replaceThis;
}
const Token *Token::tokAt(int index) const
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{
const Token *tok = this;
int num = std::abs(index);
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while (num > 0 && tok) {
if (index > 0)
tok = tok->next();
else
tok = tok->previous();
--num;
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}
return tok;
}
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Token *Token::tokAt(int index)
{
Token *tok = this;
int num = std::abs(index);
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while (num > 0 && tok) {
if (index > 0)
tok = tok->next();
else
tok = tok->previous();
--num;
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}
return tok;
}
const Token *Token::linkAt(int index) const
{
const Token *tok = this->tokAt(index);
if (!tok) {
std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
ErrorLogger::ErrorMessage::FileLocation loc;
loc.setfile("");
loc.line = this->linenr();
locationList.push_back(loc);
const ErrorLogger::ErrorMessage errmsg(locationList,
Severity::error,
"Internal error. Token::linkAt called with index outside the tokens range.",
"cppcheckError",
false);
Check::reportError(errmsg);
}
return tok ? tok->link() : 0;
}
Token *Token::linkAt(int index)
{
Token *tok = this->tokAt(index);
if (!tok) {
std::list<ErrorLogger::ErrorMessage::FileLocation> locationList;
ErrorLogger::ErrorMessage::FileLocation loc;
loc.setfile("");
loc.line = this->linenr();
locationList.push_back(loc);
const ErrorLogger::ErrorMessage errmsg(locationList,
Severity::error,
"Internal error. Token::linkAt called with index outside the tokens range.",
"cppcheckError",
false);
Check::reportError(errmsg);
}
return tok ? tok->link() : 0;
}
const std::string &Token::strAt(int index) const
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{
static const std::string empty_str;
const Token *tok = this->tokAt(index);
return tok ? tok->_str : empty_str;
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}
static bool strisop(const char str[])
{
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if (str[1] == 0) {
if (strchr("+-*/%&|^~!<>", *str))
return true;
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} else if (str[2] == 0) {
if ((str[0] == '&' && str[1] == '&') ||
(str[0] == '|' && str[1] == '|') ||
(str[0] == '=' && str[1] == '=') ||
(str[0] == '!' && str[1] == '=') ||
(str[0] == '>' && str[1] == '=') ||
(str[0] == '<' && str[1] == '=') ||
(str[0] == '>' && str[1] == '>') ||
(str[0] == '<' && str[1] == '<'))
return true;
}
return false;
}
static int multiComparePercent(const char * * haystack_p,
const char * needle,
bool emptyStringFound)
{
const char *haystack = *haystack_p;
if (haystack[0] == '%' && haystack[1] != '|') {
if (haystack[1] == 'o' && // "%op%"
haystack[2] == 'p' &&
haystack[3] == '%') {
if (strisop(needle))
return 1;
*haystack_p = haystack = haystack + 4;
} else if (haystack[1] == 'o' && // "%or%"
haystack[2] == 'r' &&
haystack[3] == '%') {
if (*needle == '|' && needle[1] != '|' && needle[1] != '=')
return 1;
*haystack_p = haystack = haystack + 4;
} else if (haystack[1] == 'o' && // "%oror%"
haystack[2] == 'r' &&
haystack[3] == 'o' &&
haystack[4] == 'r' &&
haystack[5] == '%') {
if (needle[0] == '|' && needle[1] == '|')
return 1;
*haystack_p = haystack = haystack + 6;
}
if (*haystack == '|')
*haystack_p = haystack = haystack + 1;
else if (*haystack == ' ' || *haystack == '\0')
return emptyStringFound ? 0 : -1;
else
return -1;
}
return 0xFFFF;
}
int Token::multiCompare(const char *haystack, const char *needle)
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{
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if (haystack[0] == '%' && haystack[1] == 'o') {
if (haystack[2] == 'p' && // "%op%|"
haystack[3] == '%' &&
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haystack[4] == '|') {
haystack = haystack + 5;
if (strisop(needle))
return 1;
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} else if (haystack[2] == 'r' && // "%or%|"
haystack[3] == '%' &&
haystack[4] == '|') {
haystack = haystack + 5;
if (*needle == '|' && needle[1] != '|' && needle[1] != '=')
return 1;
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} else if (haystack[2] == 'r' && // "%oror%|"
haystack[3] == 'o' &&
haystack[4] == 'r' &&
haystack[5] == '%' &&
haystack[6] == '|') {
haystack = haystack + 7;
if (needle[0] == '|' && needle[1] == '|')
return 1;
}
}
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bool emptyStringFound = false;
const char *needlePointer = needle;
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for (;;) {
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if (*needlePointer == *haystack) {
if (*needlePointer == '\0')
return 1;
++needlePointer;
++haystack;
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} else if (*haystack == '|') {
if (*needlePointer == 0) {
// If needle is at the end, we have a match.
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return 1;
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} else if (needlePointer == needle) {
// If needlePointer was not increased at all, we had a empty
// string in the haystack
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emptyStringFound = true;
}
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needlePointer = needle;
++haystack;
int ret = multiComparePercent(&haystack, needle, emptyStringFound);
if (ret < 2)
return ret;
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} else if (*haystack == ' ' || *haystack == '\0') {
if (needlePointer == needle)
return 0;
break;
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}
// If haystack and needle don't share the same character,
// find next '|' character.
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else {
needlePointer = needle;
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do {
++haystack;
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} while (*haystack != ' ' && *haystack != '|' && *haystack);
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if (*haystack == ' ' || *haystack == '\0') {
return emptyStringFound ? 0 : -1;
}
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++haystack;
int ret = multiComparePercent(&haystack, needle, emptyStringFound);
if (ret < 2)
return ret;
}
}
if (*needlePointer == '\0')
return 1;
// If empty string was found earlier from the haystack
if (emptyStringFound)
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return 0;
return -1;
}
bool Token::simpleMatch(const Token *tok, const char pattern[])
{
const char *current, *next;
current = pattern;
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next = strchr(pattern, ' ');
if (!next)
next = pattern + strlen(pattern);
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while (*current) {
size_t length = static_cast<size_t>(next - current);
if (!tok || length != tok->_str.length() || strncmp(current, tok->_str.c_str(), length))
return false;
current = next;
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if (*next) {
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next = strchr(++current, ' ');
if (!next)
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next = current + strlen(current);
}
tok = tok->next();
}
return true;
}
bool Token::firstWordEquals(const char *str, const char *word)
{
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for (;;) {
if (*str != *word) {
return !(*str == ' ' && *word == 0);
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} else if (*str == 0)
break;
++str;
++word;
}
return false;
}
const char *Token::chrInFirstWord(const char *str, char c)
{
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for (;;) {
if (*str == ' ' || *str == 0)
return 0;
if (*str == c)
return str;
++str;
}
}
int Token::firstWordLen(const char *str)
{
int len = 0;
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for (;;) {
if (*str == ' ' || *str == 0)
break;
++len;
++str;
}
return len;
}
bool Token::Match(const Token *tok, const char pattern[], unsigned int varid)
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{
const char *p = pattern;
bool firstpattern = true;
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while (*p) {
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// Skip spaces in pattern..
while (*p == ' ')
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++p;
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// No token => Success!
if (*p == 0)
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return true;
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if (!tok) {
// If we have no tokens, pattern "!!else" should return true
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if (p[1] == '!' && p[0] == '!' && p[2] != '\0') {
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while (*p && *p != ' ')
++p;
continue;
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} else
return false;
}
// If we are in the first token, we skip all initial !! patterns
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if (firstpattern && !tok->previous() && tok->next() && p[1] == '!' && p[0] == '!' && p[2] != '\0') {
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while (*p && *p != ' ')
++p;
continue;
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}
firstpattern = false;
// Compare the first character of the string for optimization reasons
// before doing more detailed checks.
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if (p[0] == '%') {
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bool patternUnderstood = false;
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switch (p[1]) {
case 'v':
// TODO: %var% should match only for
// variables that have varId != 0, but that needs a lot of
// work, before that change can be made.
// Any symbolname..
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if (p[4] == '%') { // %var%
if (!tok->isName())
return false;
p += 5;
patternUnderstood = true;
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} else { // %varid%
if (varid == 0) {
throw InternalError(tok, "Internal error. Token::Match called with varid 0. Please report this to Cppcheck developers");
}
if (tok->varId() != varid)
return false;
p += 7;
patternUnderstood = true;
}
break;
case 't':
// Type (%type%)
{
if (!tok->isName())
return false;
if (tok->varId() != 0)
return false;
if (tok->str() == "delete")
return false;
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p += 6;
patternUnderstood = true;
}
break;
case 'a':
// Accept any token (%any%)
{
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p += 5;
patternUnderstood = true;
}
break;
case 'n':
// Number (%num)
{
if (!tok->isNumber())
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return false;
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p += 5;
patternUnderstood = true;
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}
break;
case 's':
// String (%str%)
{
if (tok->_str[0] != '\"')
return false;
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p += 5;
patternUnderstood = true;
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}
break;
case 'b':
// Bool (%bool%)
{
if (!tok->isBoolean())
return false;
p += 6;
patternUnderstood = true;
}
break;
case 'o':
// Or (%or%) and Op (%op%)
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if (p[3] == '%') {
patternUnderstood = true;
// multicompare..
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if (p[4] == '|') {
int result = multiCompare(p, tok->str().c_str());
if (result == -1)
return false; // No match
while (*p && *p != ' ')
p++;
}
// single compare..
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else if (p[2] == 'r') {
if (tok->str() != "|")
return false;
p += 4;
} else if (p[2] == 'p') {
if (!tok->isOp())
return false;
p += 4;
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} else
patternUnderstood = false;
}
// Oror (%oror%)
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else if (p[5] == '%') {
// multicompare..
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if (p[6] == '|') {
int result = multiCompare(p, tok->str().c_str());
if (result == -1)
return false; // No match
while (*p && *p != ' ')
p++;
}
// single compare..
else if (tok->str() != "||")
return false;
else
p += 6;
patternUnderstood = true;
}
break;
default:
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if (firstWordEquals(p, tok->_str.c_str())) {
p += tok->_str.length();
patternUnderstood = true;
}
break;
}
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if (!patternUnderstood) {
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return false;
}
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// debugging: assert that this is not part of a multicompare pattern..
assert(*p != '|');
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tok = tok->next();
continue;
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}
// [.. => search for a one-character token..
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else if (p[0] == '[' && chrInFirstWord(p, ']')) {
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if (tok->_str.length() != 1)
return false;
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const char *temp = p + 1;
bool chrFound = false;
int count = 0;
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while (*temp && *temp != ' ') {
if (*temp == ']') {
++count;
++temp;
continue;
}
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if (*temp == tok->_str[0]) {
chrFound = true;
break;
}
++temp;
}
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if (count > 1) {
if (tok->_str[0] == ']')
chrFound = true;
}
if (!chrFound)
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return false;
}
// Parse multi options, such as void|int|char (accept token which is one of these 3)
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else if (chrInFirstWord(p, '|') && (p[0] != '|' || firstWordLen(p) > 2)) {
int res = multiCompare(p, tok->_str.c_str());
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if (res == 0) {
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// Empty alternative matches, use the same token on next round
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while (*p && *p != ' ')
++p;
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continue;
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} else if (res == -1) {
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// No match
return false;
}
}
// Parse "not" options. Token can be anything except the given one
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else if (p[1] == '!' && p[0] == '!' && p[2] != '\0') {
if (!firstWordEquals(&(p[2]), tok->str().c_str()))
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return false;
}
else if (firstWordEquals(p, tok->_str.c_str())) {
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return false;
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}
while (*p && *p != ' ')
++p;
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tok = tok->next();
}
// The end of the pattern has been reached and nothing wrong has been found
return true;
}
std::size_t Token::getStrLength(const Token *tok)
{
assert(tok != NULL);
size_t len = 0;
const std::string strValue(tok->strValue());
const char *str = strValue.c_str();
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while (*str) {
if (*str == '\\') {
++str;
// string ends at '\0'
if (*str == '0')
break;
}
++str;
++len;
}
return len;
}
void Token::move(Token *srcStart, Token *srcEnd, Token *newLocation)
{
/**[newLocation] -> b -> c -> [srcStart] -> [srcEnd] -> f */
// Fix the gap, which tokens to be moved will leave
srcStart->previous()->next(srcEnd->next());
srcEnd->next()->previous(srcStart->previous());
// Fix the tokens to be moved
srcEnd->next(newLocation->next());
srcStart->previous(newLocation);
// Fix the tokens at newLocation
newLocation->next()->previous(srcEnd);
newLocation->next(srcStart);
// Update _progressValue
for (Token *tok = srcStart; tok != srcEnd->next(); tok = tok->next())
tok->_progressValue = newLocation->_progressValue;
}
Token* Token::nextArgument() const
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{
for (const Token* tok = this; tok; tok = tok->next()) {
if (tok->str() == ",")
return tok->next();
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else if (tok->str() == "(" || tok->str() == "{" || tok->str() == "[")
tok = tok->link();
else if (tok->str() == "<" && tok->link())
tok = tok->link();
else if (tok->str() == ")" || tok->str() == ";")
return 0;
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}
return 0;
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}
bool Token::findClosingBracket(const Token*& closing) const
{
if (_str == "<") {
unsigned int depth = 0;
for (closing = this; closing != NULL; closing = closing->next()) {
if (closing->str() == "{" || closing->str() == "[" || closing->str() == "(")
closing = closing->link();
else if (closing->str() == "}" || closing->str() == "]" || closing->str() == ")" || closing->str() == ";" || closing->str() == "=")
return false;
else if (closing->str() == "<")
++depth;
else if (closing->str() == ">") {
if (--depth == 0)
return true;
} else if (closing->str() == ">>") {
if (--depth == 0)
return true;
if (--depth == 0)
return true;
}
}
}
return false;
}
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//---------------------------------------------------------------------------
const Token *Token::findsimplematch(const Token *tok, const char pattern[])
{
for (; tok; tok = tok->next()) {
if (Token::simpleMatch(tok, pattern))
return tok;
}
return 0;
}
const Token *Token::findsimplematch(const Token *tok, const char pattern[], const Token *end)
{
for (; tok && tok != end; tok = tok->next()) {
if (Token::simpleMatch(tok, pattern))
return tok;
}
return 0;
}
const Token *Token::findmatch(const Token *tok, const char pattern[], unsigned int varId)
{
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for (; tok; tok = tok->next()) {
if (Token::Match(tok, pattern, varId))
return tok;
}
return 0;
}
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const Token *Token::findmatch(const Token *tok, const char pattern[], const Token *end, unsigned int varId)
{
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for (; tok && tok != end; tok = tok->next()) {
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if (Token::Match(tok, pattern, varId))
return tok;
}
return 0;
}
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void Token::insertToken(const std::string &tokenStr)
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{
Token *newToken;
if (_str.empty())
newToken = this;
else
newToken = new Token(tokensBack);
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newToken->str(tokenStr);
newToken->_linenr = _linenr;
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newToken->_fileIndex = _fileIndex;
newToken->_progressValue = _progressValue;
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if (newToken != this) {
if (this->next()) {
newToken->next(this->next());
newToken->next()->previous(newToken);
} else if (tokensBack) {
*tokensBack = newToken;
}
this->next(newToken);
newToken->previous(this);
}
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}
void Token::eraseTokens(Token *begin, const Token *end)
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{
if (!begin || begin == end)
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return;
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while (begin->next() && begin->next() != end) {
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begin->deleteNext();
}
}
void Token::createMutualLinks(Token *begin, Token *end)
{
assert(begin != NULL);
assert(end != NULL);
assert(begin != end);
begin->link(end);
end->link(begin);
}
void Token::printOut(const char *title) const
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{
if (title)
std::cout << "\n### " << title << " ###\n";
std::cout << stringifyList(true, true, true, true, true, 0, 0) << std::endl;
}
void Token::printOut(const char *title, const std::vector<std::string> &fileNames) const
{
if (title)
std::cout << "\n### " << title << " ###\n";
std::cout << stringifyList(true, true, true, true, true, &fileNames, 0) << std::endl;
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}
void Token::stringify(std::ostream& os, bool varid, bool attributes) const
{
if (attributes) {
if (isUnsigned())
os << "unsigned ";
else if (isSigned())
os << "signed ";
if (isLong())
os << "long ";
}
os << _str;
if (varid && _varId != 0)
os << '@' << _varId;
}
std::string Token::stringifyList(bool varid, bool attributes, bool linenumbers, bool linebreaks, bool files, const std::vector<std::string>* fileNames, const Token* end) const
{
if (this == end)
return "";
std::ostringstream ret;
unsigned int lineNumber = _linenr;
int fileInd = files?-1:_fileIndex;
std::map<int, unsigned int> lineNumbers;
for (const Token *tok = this; tok != end; tok = tok->next()) {
bool fileChange = false;
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if (static_cast<int>(tok->_fileIndex) != fileInd) {
if (fileInd != -1) {
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lineNumbers[fileInd] = tok->_fileIndex;
}
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fileInd = static_cast<int>(tok->_fileIndex);
if (files) {
ret << "\n\n##file ";
if (fileNames && fileNames->size() > tok->_fileIndex)
ret << fileNames->at(tok->_fileIndex);
else
ret << fileInd;
}
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lineNumber = lineNumbers[fileInd];
fileChange = true;
}
if (linebreaks && (lineNumber != tok->linenr() || fileChange)) {
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while (lineNumber < tok->linenr()) {
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++lineNumber;
ret << '\n';
if (linenumbers) {
ret << lineNumber << ':';
if (lineNumber == tok->linenr())
ret << ' ';
}
}
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lineNumber = tok->linenr();
}
tok->stringify(ret, varid, attributes); // print token
if (tok->next() != end && (!linebreaks || (tok->next()->linenr() <= tok->linenr() && tok->next()->fileIndex() == tok->fileIndex())))
ret << ' ';
}
if (linebreaks && files)
ret << '\n';
return ret.str();
}
std::string Token::stringifyList(const Token* end, bool attributes) const
{
return stringifyList(false, attributes, false, false, false, 0, end);
}
std::string Token::stringifyList(bool varid) const
{
return stringifyList(varid, false, true, true, true, 0, 0);
}