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Diffstat (limited to 'test/scanners/c/pleac.in.c')
| -rw-r--r-- | test/scanners/c/pleac.in.c | 518 |
1 files changed, 0 insertions, 518 deletions
diff --git a/test/scanners/c/pleac.in.c b/test/scanners/c/pleac.in.c deleted file mode 100644 index 2f84217..0000000 --- a/test/scanners/c/pleac.in.c +++ /dev/null @@ -1,518 +0,0 @@ -// -*- c++ -*- - -// @@PLEAC@@_NAME -// @@SKIP@@ C++/STL/Boost - - -// @@PLEAC@@_WEB -// @@SKIP@@ http://www.research.att.com/~bs/C++.html -// @@SKIP@@ http://www.boost.org/ - - -// @@PLEAC@@_1.0 -// In C++, one can use the builtin 'char *' type or the 'string' type -// to represent strings. In this section, we will work with the C++ -// library 'string' class. - -// Characteristics of 'string' types: -// - may be of any length -// - are defined within the std namespace -// - can be converted to a 'const char *' using std::string::c_str() -// - can be subscripted to access individual characters (e.g., str[3] -// returns the 4th character of the string -// - memory associated with strings is reclaimed automatically as strings -// go out of scope -// - strings cannot be used as true/false values (i.e., the following is not -// allowed: string s; if (s) {}) - -//----------------------------- -// Before using strings, you must include the <string> header file -#include <string> - -//----------------------------- -// To create a literal strings, you must use double quotes ("). You cannot -// use single quotes. - -//----------------------------- -// String variables must be declared -- if no value is given it's -// value is the empty string (""). -std::string s; - -//----------------------------- -// To insert special characters, quote the character with \ -std::string s1 = "\\n"; // Two characters, \ and n -std::string s2 = "Jon \"Maddog\" Orwant"; // Literal double quotes - -//----------------------------- -// Strings can be declared in one of two ways -std::string s1 = "assignment syntax"; -std::string s2("constructor syntax"); - -//----------------------------- -// Multi-line strings. -// There is no equivalent to perl's "here" documents in c++ -std::string s1 = " -This is a multiline string started and finished with double -quotes that spans 4 lines (it contains 3 newline characters). -"; - -std::string s2 = "This is a multiline string started and finished with double -quotes that spans 2 lines (it contains 1 newline character)."; -//----------------------------- - - -// @@PLEAC@@_1.1 -std::string s = "some string"; - -//----------------------------- -std::string value1 = s.substr(offset, length); -std::string value2 = s.substr(offset); - -// Unlike perl, the substr function returns a copy of the substring -// rather than a reference to the existing substring, thus using substr -// on the left hand side of an assignment statement will not modify -// the original string. To get this functionality, you can use the -// std::string::replace function. - -// Using offsets and lengths -s.replace(offset, length, newstring); -s.replace(offset, s.size()-offset, newtail); - -//----------------------------- -// The C++ string class doesn't have anything equivalent to perl's unpack. -// Instead, one can use C structures to import/export binary data - -//----------------------------- -#include <string> -string s = "This is what you have"; - -std::string first = s.substr(0, 1); // "T" -std::string second = s.substr(5, 2); // "is" -std::string rest = s.substr(13); // "you have" - -// C++ strings do not support backwards indexing as perl does but -// you can fake it out by subtracting the negative index from the -// string length -std::string last = s.substr(s.size()-1); // "e" -std::string end = s.substr(s.size()-4); // "have" -std::string piece = s.substr(s.size()-8, 3); // "you" - -//----------------------------- -#include <string> -#include <iostream> - -string s("This is what you have"); -std::cout << s << std::endl; -// This is what you have - -s.replace(5,2,"wasn't"); // change "is to "wasn't" -// This wasn't what you have - -s.replace(s.size()-12, 12, "ondrous"); // "This wasn't wondrous" -// This wasn't wonderous - -s.replace(0, 1, ""); // delete first character -// his wasn't wondrous - -s.replace(s.size()-10, 10, ""); // delete last 10 characters -// his wasn' - -//----------------------------- -// C++ does not have built-in support for the perl s///, m//, and tr/// -// operators; however, similar results can be achieved in at least -// two ways: -// - string operations such as string::find, string::rfind, etc. -// - the boost regular expression library (regex++) supports perl -// regular expression syntax. -// TODO: Add examples of each. - -// MISSING: if (substr($string, -10) =~ /pattern/) { -// print "Pattern matches in last 10 characters\n"; -// } - -// MISSING: substr($string, 0, 5) =~ s/is/at/g; - -//----------------------------- -// exchange the first and last letters in a string using substr and replace -string a = "make a hat"; - -std::string first = a.substr(0,1); -std::string last = a.substr(a.size()-1); - -a.replace(0,1, last); -a.replace(a.size()-1, 1, first); - -// exchange the first and last letters in a string using indexing and swap -#include <algorithm> -std::swap(a[0], a[a.size()-1]); -//----------------------------- - - -// @@PLEAC@@_1.2 -//----------------------------- -// C++ doesn't have functionality equivalent to the || and ||=. -// If statements and trigraphs can be used instead. -//----------------------------- -// C++ doesn't have anything equivalent "defined". C++ variables -// cannot be used at all if they have not previously been defined. - -//----------------------------- -// Use b if b is not empty, else c -a = b.size() ? b : c; - -// Set x to y unless x is not empty -if (x.is_empty()) x = y; - -//----------------------------- -foo = (!bar.is_empty()) ? bar : "DEFAULT VALUE"; - -//----------------------------- -// NOTE: argv is declared as char *argv[] in C/C++. We assume -// the following code surrounds the following examples that deal -// with argv. Also, arguments to a program start at argv[1] -- argv[0] -// is the name of the executable that's running. -#include <string.h> -int main(int argc, char *argv[]) { - char **args = argv+1; // +1 skips argv[0], the name of the executable - // examples -} - -//----------------------------- -std::string dir = (*args) ? *argv++ : "/tmp"; - -//----------------------------- -std::string dir = argv[1] ? argv[1] : "/tmp"; - -//----------------------------- -std::string dir = (argc-1) ? argv[1] : "/tmp"; - -//----------------------------- -#include <map> -std::map<std::string,int> count; - -count[shell.size() ? shell : "/bin/sh"]++; - -//----------------------------- -// find the user name on Unix systems -// TODO: Simplify. This is too ugly and complex -#include <sys/types.h> -#include <unistd.h> -#include <pwd.h> -#include "boost/lexical_cast.hpp" - -std::string user; -char *msg = 0; -passwd *pwd = 0; - -if ( (msg = getenv("USER")) || - (msg = getenv("LOGNAME")) || - (msg = getlogin()) ) - user = msg; -else if (pwd = getpwuid(getuid())) - user = pwd->pw_name; -else - user = "Unknown uid number " + boost::lexical_cast<std::string>(getuid()); - -//----------------------------- -if (starting_point.is_empty()) starting_point = "Greenwich"; - -//----------------------------- -// Example using list. Other C++ STL containers work similarly. -#include <list> -list<int> a, b; -if (a.is_empty()) a = b; // copy only if a is empty -a = (!b.is_empty()) ? b : c; // asign b if b nonempty, else c -//----------------------------- - - -// @@PLEAC@@_1.3 -//----------------------------- -#include <algorithm> -std::swap(a, b); - -//----------------------------- -temp = a; -a = b; -b = temp; - -//----------------------------- -std::string a("alpha"); -std::string b("omega"); -std::swap(a,b); - -//----------------------------- -// The ability to exchange more than two variables at once is not -// built into the C++ language or C++ standard libraries. However, you -// can use the boost tuple library to accomplish this. -#include <boost/tuple/tuple.hpp> - -boost::tie(alpha,beta,production) - = boost::make_tuple("January", "March", "August"); -// move beta to alpha, -// move production to beta, -// move alpha to production -boost::tie(alpha, beta, production) - = boost::make_tuple(beta, production, alpha); -//----------------------------- - - -// @@PLEAC@@_1.4 -//----------------------------- -// There are several ways to convert between characters -// and integers. The examples assume the following declarations: -char ch; -int num; - -//----------------------------- -// Using implicit conversion -num = ch; -ch = num; - -//----------------------------- -// New-style C++ casts -ch = static_cast<char>(num); -num = static_cast<int>(ch); - -//----------------------------- -// Old-style C casts -ch = (char)num; -num = (int)ch; - -//----------------------------- -// Using the C++ stringstream class -#include <sstream> // On some older compilers, use <strstream> -std::stringstream a; // On some older compilers, use std::strstream - -a << ch; // Append character to a string -a >> num; // Output character as a number - -a << num; // Append number to a string -a >> ch; // Output number as a character - -//----------------------------- -// Using sprintf, printf -char str[2]; // Has to be length 2 to have room for NULL character -sprintf(str, "%c", num); -printf("Number %d is character %c\n", num, num); - -//----------------------------- -int ascii_value = 'e'; // now 101 -char character = 101; // now 'e' - -//----------------------------- -printf("Number %d is character %c\n", 101, 101); - -//----------------------------- -// Convert from HAL to IBM, character by character -#include <string> -#include <iostream> - -std::string ibm, hal = "HAL"; -for (unsigned int i=0; i<hal.size(); ++i) - ibm += hal[i]+1; // Add one to each ascii value -std::cout << ibm << std::endl; // prints "IBM" - -//----------------------------- -// Convert hal from HAL to IBM -#include <string> -#include <iostream> -#include <functional> // For bind1st and plus<> -#include <algorithm> // For transform - -std::string hal = "HAL"; -transform(hal.begin(), hal.end(), hal.begin(), - bind1st(plus<char>(),1)); -std::cout << hal << std::endl; // prints "IBM" -//----------------------------- - - -// @@PLEAC@@_1.5 -//----------------------------- -// Since C++ strings can be accessed one character at a time, -// there's no need to do any processing on the string to convert -// it into an array of characters. -#include <string> -std::string s; - -// Accessing characters using for loop and integer offsets -for (unsigned int i=0; i<s.size(); ++i) { - // do something with s[i] -} - -// Accessing characters using iterators -for (std::string::iterator i=s.begin(); i!=s.end(); ++i) { - // do something with *i -} - -//----------------------------- -std::string str = "an apple a day"; -std::map<char,int> seen; - -for (std::string::iterator i=str.begin(); i!=str.end(); ++i) - seen[*i]++; - -std::cout << "unique chars are: "; -for (std::map<char,int>::iterator i=seen.begin(); i!=seen.end(); ++i) - std::cout << i->first; -std::cout << std::endl; -// unique chars are: adelnpy - -//----------------------------- -int sum = 0; -for (std::string::iterator i=str.begin(); i!=str.end(); ++i) - sum += *i; -std::cout << "sum is " << sum << std::endl; -// prints "sum is 1248" if str was "an appla a day" - - -//----------------------------- -// MISSING: sysv-like checksum program - -//----------------------------- -// slowcat, emulate a slow line printer -#include <sys/time.h> -#include <iostream> -#include <fstream> - -int main(int argc, char *argv[]) { - timeval delay = { 0, 50000 }; // Delay in { seconds, nanoseconds } - char **arg = argv+1; - while (*arg) { // For each file - std::ifstream file(*arg++); - char c; - while (file.get(c)) { - std::cout.put(c); - std::cout.flush(); - select(0, 0, 0, 0, &delay); - } - } -} -//----------------------------- - - -// @@PLEAC@@_1.6 -//----------------------------- -#include <string> -#include <algorithm> // For reverse -std::string s; - -reverse(s.begin(), s.end()); - -//----------------------------- -#include <vector> // For std::vector -#include <sstream> // On older compilers, use <strstream> -#include "boost/regex.hpp" // For boost::regex_split - -std::string str; -std::vector<std::string> words; -boost::regex_split(std::back_inserter(words), str); -reverse(words.begin(), words.end()); // Reverse the order of the words - -std::stringstream revwords; // On older compilers, use strstream -copy(words.begin(), words.end(), ostream_inserter<string>(revwords," "); -std::cout << revwards.str() << std::endl; - -//----------------------------- -std::string rts = str; -reverse(rts.begin(), rts.end()); // Reverses letters in rts - -//----------------------------- -std::vector<string> words; -reverse(words.begin(), words.end()); // Reverses words in container - -//----------------------------- -// Reverse word order -std::string s = "Yoda said, 'can you see this?'"; - -std::vector<std::string> allwords; -boost::regex_split(std::back_inserter(allwords), s); - -reverse(allwords.begin(), allwords.end()); - -std::stringstream revwords; // On older compilers, use strstream -copy(allwords.begin(), allwords.end(), ostream_inserter<string>(revwords," ")); -std::cout << revwards.str() << std::endl; -// this?' see you 'can said, Yoda - -//----------------------------- -std::string word = "reviver"; -bool is_palindrome = equal(word.begin(), word.end(), word.rbegin()); - -//----------------------------- -#include <ifstream> - -std::ifstream dict("/usr/dict/words"); -std::string word; -while(getline(dict,word)) { - if (equal(word.begin(), word.end(), word.rbegin()) && - word.size() > 5) - std::cout << word << std::endl; -} -//----------------------------- - - -// @@PLEAC@@_1.7 -//----------------------------- -#include <string> - -std::string::size_type pos; -while ((pos = str.find("\t")) != std::string::npos) - str.replace(pos, 1, string(' ',8-pos%8)); -//----------------------------- - - -// @@PLEAC@@_1.8 -//----------------------------- -// Not applicable to C++ -//----------------------------- - - -// @@PLEAC@@_1.9 -//----------------------------- -// TODO: Fix to be more like cookbook -// TODO: Modify/add code to do this with locales -#include <string> -#include <algorithm> - -std::string phrase = "bo peep"; -transform(phrase.begin(), phrase.end(), phrase.begin(), toupper); -// "BO PEEP" -transform(phrase.begin(), phrase.end(), phrase.begin(), tolower); -// "bo peep" -//----------------------------- - - -// @@PLEAC@@_1.10 -//----------------------------- -// C++ does not provide support for perl-like in-string interpolation, -// concatenation must be used instead. - -#include <string> - -std::string var1, var2; -std::string answer = var1 + func() + var2; // func returns string or char * - -//----------------------------- -#include "boost/lexical_cast.hpp" - -int n = 4; -std::string phrase = "I have " + boost::lexical_cast<string>(n+1) + " guanacos."; - -//----------------------------- -std::cout << "I have " + boost::lexical_cast<string>(n+1) + " guanacos." << std::endl; - - -// @@PLEAC@@_1.11 -//----------------------------- -// C++ does not have "here documents". -// TODO: Lots more. -#include <string> -#include "boost/regex.hpp" - -std::string var = " - your text - goes here. -"; - -boost::regex ex("^\\s+"); -var = boost::regex_merge(var, ex, "");
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