From b1e359d4e02099787f1fc36255a27b665b135710 Mon Sep 17 00:00:00 2001
From: Julian Daube <joposter@gmail.com>
Date: Sun, 8 Oct 2017 18:44:27 +0200
Subject: [PATCH] real test file, ported stuff to c++ streams

---
 Einleitung.tex    |   2 +
 Makefile          |  14 +-
 fs.cpp            |  95 ++++++++++
 fs.hpp            |  67 +++++++
 main.cpp          | 471 +++++++++++++++++++---------------------------
 memory_string.hpp |  86 +++++++++
 test.tex          |  16 +-
 7 files changed, 460 insertions(+), 291 deletions(-)
 create mode 100644 Einleitung.tex
 create mode 100644 fs.cpp
 create mode 100644 fs.hpp
 create mode 100644 memory_string.hpp

diff --git a/Einleitung.tex b/Einleitung.tex
new file mode 100644
index 0000000..632010a
--- /dev/null
+++ b/Einleitung.tex
@@ -0,0 +1,2 @@
+\section{Einleitung}
+HI\footnote{Fußnote}
diff --git a/Makefile b/Makefile
index 33f298d..b13bd06 100644
--- a/Makefile
+++ b/Makefile
@@ -1,17 +1,19 @@
-OBJ:=main.o
-OUTPUT:= preparse
+OBJ:= main.o fs.o
+OUTPUT:= texdepends
 
 .PHONY: test debug clean
 
-all test: debug
+all: debug
+test: debug
 	./$(OUTPUT) test.tex
 
-debug: CXXFLAGS:= -g -std=c++11 -O0
+debug: CXXFLAGS:= -g -std=c++11
 debug: $(OUTPUT)
 
 clean:
 	$(RM) $(OBJ) $(OUTPUT)
 
-$(OUTPUT): $(OBJ)
-	$(CXX) $(OBJ) -o preparse
+main.o: fs.o
 
+$(OUTPUT): main.o
+	$(CXX) $(OBJ) -o $(OUTPUT)
diff --git a/fs.cpp b/fs.cpp
new file mode 100644
index 0000000..b7c904b
--- /dev/null
+++ b/fs.cpp
@@ -0,0 +1,95 @@
+/*
+ * fs.cpp
+ *
+ * Unix implementation
+ *
+ *  Created on: 08.10.2017
+ *      Author: julian
+ */
+
+#include "fs.hpp"
+
+#include <unistd.h>
+
+namespace Path {
+
+std::tuple<Path,Path> Split(const Path &p) {
+	auto it = p.end();
+	while(it != p.begin() && *it != '/') {
+		it--;
+	}
+
+	return std::make_tuple(Path(p.begin(), it), Path(it,p.end()));
+}
+
+Path Name(const Path &p) {
+	return std::get<1>(Split(p));
+}
+
+Path Dir(const Path &p) {
+	return std::get<0>(Split(p));
+}
+
+Path Clean(const Path &p) {
+	Path temp (p);
+
+	auto it = temp.begin();
+	bool hasSlash = false;
+	while(it != temp.end()) {
+		if (*it == '/') {
+			if (hasSlash) {
+				// remove
+				temp.erase(it);
+				continue;
+			}
+
+			hasSlash = true;
+		} else {
+			hasSlash = false;
+		}
+		it++;
+	}
+
+	return temp;
+}
+
+std::string Extension(const Path &path) {
+	auto it = path.end();
+	while(it != path.begin() && *it != '.' && *it != '/') {
+		it--;
+	}
+
+	return std::string(it, path.end());
+}
+
+std::string Basename(const Path &path) {
+	Path temp = Name(path);
+
+	auto it = temp.end();
+	while(it != temp.begin() && *it != '.') {
+		it--;
+	}
+
+	if (it == temp.begin()) {
+		return path;
+	}
+
+	return std::string(temp.begin(), it);
+}
+
+}; // end namespace Path
+
+
+Path::Path fs::cwd() {
+	ssize_t size = 1000, nsize;
+
+	while(1) {
+		char buffer[size];
+		if ((nsize = readlink("/proc/self/cwd", buffer, size)) < size) {
+			buffer[nsize] = 0;
+			return Path::Clean(Path::Path(buffer));
+		}
+		size = nsize + 100;
+	}
+}
+
diff --git a/fs.hpp b/fs.hpp
new file mode 100644
index 0000000..d94eea9
--- /dev/null
+++ b/fs.hpp
@@ -0,0 +1,67 @@
+/*
+ * fs.hpp
+ *
+ *  Created on: 08.10.2017
+ *      Author: julian
+ */
+
+#ifndef FS_HPP_
+#define FS_HPP_
+
+#include <string>
+#include <tuple>
+
+namespace Path {
+	typedef std::string Path;
+
+	// cleanup double path limiters
+	Path Clean(const Path &p);
+
+	inline Path Join(const Path &a, const Path &b) {
+		if (a.empty()) return b;
+		if (b.empty()) return a;
+
+		return a + "/" + b;
+	}
+
+	// Join n path parts together
+	template <typename ...T>
+	inline Path Join(const Path &p, T ... list) {
+		return Path(p) + "/" + Join(list...);
+	}
+
+
+	// Split a path into the name and the remainder
+	// e.g. "a/b/c.d becomes (a/b, c.d)
+	std::tuple<Path, Path> Split(const Path &path);
+
+	// strips the path of the filename
+	Path Dir(const Path &path);
+
+	// returns just the filename
+	Path Name(const Path &path);
+
+	// returns the filename's extension as string
+	// or empty if the path points to a directory
+	std::string Extension(const Path &path);
+
+	// returns the filename stripped of the first extension
+	// or empty if the path points to a directory
+	std::string Basename(const Path &path);
+
+	inline bool isRelative(const Path &path) { return path.size() && path.front() != '/'; }
+	inline bool isAbsolute(const Path &path) { return path.size() && path.front() == '/'; }
+
+	inline bool isDir(const Path &path) { return path.size() && path.back() == '/'; }
+	inline bool isFile(const Path &path) { return path.size() && path.back() != '/'; }
+}
+
+namespace fs {
+
+	// return the current working directory
+	Path::Path cwd();
+}
+
+
+
+#endif /* FS_HPP_ */
diff --git a/main.cpp b/main.cpp
index b54351a..2237927 100644
--- a/main.cpp
+++ b/main.cpp
@@ -9,122 +9,20 @@
 #include <sys/stat.h>	// for fstat()
 #include <fcntl.h>		// for open()
 #include <unistd.h>		// for close()
-#include <errno.h>	// for perror()
-
+#include <errno.h>		// for perror()
 
 #include <iostream>
 #include <string>
 #include <cstring>
 #include <vector>
 #include <map>
+#include <set>
+
+#include "fs.hpp"
+#include "memory_string.hpp"
 
 using namespace std;
 
-struct Substring {
-	const char * start, * end;
-
-	Substring(const char * start, const char * end) :
-		start(start), end(end) {}
-
-	Substring(const char * str):
-		start(str), end(str + strlen(str))
-	{}
-
-	Substring():
-		start(nullptr), end(nullptr)
-	{}
-
-
-	std::string toString() const {
-		std::string temp;
-		temp.reserve(size());
-
-		const char * it = start;
-		while(it != end) {
-			temp += *it;
-			it++;
-		}
-
-		return temp;
-	}
-	operator std::string() {
-		return toString();
-	}
-
-	std::string::size_type size() const {
-		return (std::string::size_type)(end - start);
-	}
-
-	friend std::ostream &operator<<(std::ostream &out, const Substring &str);
-
-	template <class IterA, class IterB>
-	int __compare(IterA a, IterA aend, IterB b, IterB bend) const {
-		while(a != aend && b != bend) {
-			if (*a < * b) {
-				return -1;
-			}
-			if (*a > *b) {
-				return 1;
-			}
-
-			a++;
-			b++;
-		}
-
-		if (a == aend && b == bend) {
-			return 0;
-		}
-
-		if (a != aend) {
-			return 1;
-		}
-
-		return -1;
-	}
-
-
-	int compare(const Substring &other) const {
-		return __compare(start, end, other.start, other.end);
-	}
-
-	int compare(const std::string &other) const {
-		return __compare(start, end, other.begin(), other.end());
-	}
-
-	template <typename T>
-	bool operator<(const T &other) const {
-		return compare(other) < 0;
-	}
-
-	template <typename T>
-	bool operator>(const T &other) const {
-		return compare(other) > 0;
-	}
-
-	template <typename T>
-	bool operator==(const T &other) const {
-		return compare(other) == 0;
-	}
-
-	template <typename T>
-	bool operator!=(const T &other) const {
-		return !(*this == other);
-	}
-};
-
-
-
-std::ostream &operator<<(std::ostream &out, const Substring &str) {
-	auto temp = str.start;
-	while(temp != str.end) {
-		out << *temp;
-		temp++;
-	}
-
-	return out;
-}
-
-
 class InputExtractor
 {
 public:
@@ -133,73 +31,89 @@ public:
 		Exception(const std::string &str) : std::runtime_error(str) {}
 	};
 
-	typedef std::vector<std::string> List;
-	List operator()(const Substring &input);
+	typedef std::vector<Path::Path> List;
 
-	std::string macroExpand(Substring input);
+	List operator()(const Path::Path &file, const MemoryString &str);
+
+	std::string macroExpand(const std::string &input);
+	List Include(Path::Path);
 
 protected:
-	Substring file;
-	std::map<std::string, Substring> macros;
+	std::map<std::string, std::string> macros;
+	std::set<Path::Path> includes;
 };
 
-Substring readBrackets(Substring &input, const char * brackets) {
-	if (input.size() <= 0 || *input.start != brackets[0]) {
-		cout << "expected " << brackets[0] << ", got: '" << *input.start << "'";
-		return Substring();
+#include <functional>
+
+
+template <typename iterator>
+std::string readTill(iterator &start, const iterator &end, std::function<bool(const iterator&)> limiter) {
+	while(start != end && !limiter(start)) {
+		++start;
 	}
 
-	input.start++;
-
-	int depth = 1;
-	Substring result(input.start, input.start);
-
-	while(depth > 0 && input.size() > 0) {
-		if (*input.start == brackets[0]) {
-			depth++;
-		}
-		if (*input.start == brackets[1]) {
-			depth--;
-
-			if(depth==0) break;
-		}
-		result.end = ++input.start;
-	}
-	// advance beyond last bracket
-	if (input.size())
-		input.start++;
-
-	return result;
+	return std::string(start, end);
 }
 
-std::string InputExtractor::macroExpand(Substring input) {
+
+template <typename iterator>
+std::string readBrackets(iterator &begin, const iterator &end, const char * brackets) {
+	auto current = begin;
+
+	if (begin == end || *current != brackets[0]) {
+		return std::string();
+	}
+
+	// skip first opening bracket
+	current++;
+
+	int depth = 1;
+	auto bbegin = current, bend = current;
+
+	while(depth > 0 && current != end) {
+		if (*current== brackets[0]) {
+			depth++;
+		} else if (*current == brackets[1]) {
+			depth--;
+		} else {
+			bend = ++current;
+		}
+	}
+
+	// advance beyond last bracket
+	if (current != end)
+		current++;
+
+
+	return std::string(bbegin, bend);
+}
+
+std::string InputExtractor::macroExpand(const std::string &input) {
 	std::string result;
-	Substring name;
-	std::map<std::string, Substring>::iterator lookup;
+	std::map<std::string, std::string>::iterator lookup;
 	//cout << "expanding: " << input << endl;
 
-	while(input.size() > 0) {
-		if (*input.start == '\\') {
-			input.start++;
-			name.start = name.end = input.start;
+	std::string::const_iterator current = input.begin();
+	while(current != input.end()) {
+		if (*current == '\\') {
+			current++;
+			std::string::const_iterator start = current;
 
-			while(input.size() > 0) {
-				name.end = ++input.start;
-
-				if ((lookup = macros.find(name.toString())) != macros.end()) {
+			while(current != input.end() && *current != '\\') {
+				if ((lookup = macros.find(std::string(start, current))) != macros.end()) {
 					break;
 				}
 			}
 
 			if (lookup == macros.end()) {
-				throw Exception("unknown macro in macro expansion: " + name.toString());
+				throw Exception("unknown macro in macro expansion: " + std::string(start, current));
 			}
 
-			result += lookup->second.toString();
+			result += lookup->second;
 		} else {
-			result += *input.start;
+			result += *current;
 		}
-		input.start++;
+		++current;
 	}
 
 	return result;
@@ -208,73 +122,8 @@ std::string InputExtractor::macroExpand(Substring input) {
 #include <functional>
 typedef std::map<std::string, std::function<void(InputExtractor::List&, std::string)>> CommandList;
 
-std::string Extension(std::string str) {
-	auto it = str.end();
-	while(it != str.begin() && *it != '.' && *it != '/' && *it != '\\') {
-		it--;
-	}
-
-	return std::string(it, str.end());
-}
-
-std::string Basedir(std::string path) {
-	auto it = path.end();
-	while(it != path.begin() && *it != '/' && *it != '\\') {
-		it--;
-	}
-
-	return std::string(path.begin(), it);
-}
-
-std::string Name(std::string path) {
-	auto it = path.end();
-	while(it != path.begin() && *it != '/' && *it != '\\') {
-		it--;
-	}
-
-	return std::string(it, path.end());
-}
-
-std::string Basename(std::string path) {
-	std::string temp = Name(path);
-
-	auto it = temp.end();
-	while(it != temp.begin() && *it != '.') {
-		it--;
-	}
-
-	if (it == temp.begin()) {
-		return path;
-	}
-
-	return std::string(temp.begin(), it);
-}
-
-inline bool PathRelative(std::string path) {
-	return path.size() && path[0] != '/';
-}
-
 #include <unistd.h>
 
-std::string cwd() {
-	ssize_t size = 1000, nsize;
-
-	while(1) {
-		char buffer[size];
-		if ((nsize = readlink("/proc/self/cwd", buffer, size)) < size) {
-			buffer[size] = 0;
-			return std::string(buffer);
-		}
-		size = nsize + 100;
-	}
-
-//
-//	buffer[rsize+1] = 0;
-//
-//	std::string result;
-//	result.assign(buffer);
-//	return result;
-}
 
 #include <fstream>
 
@@ -288,8 +137,22 @@ bool Exists(std::string path) {
 	return true;
 }
 
-InputExtractor::List Include(std::string path) {
-	InputExtractor::List list;
+InputExtractor::List InputExtractor::Include(Path::Path path) {
+	path = Path::Clean(path);
+	List list;
+
+	std::cout << "including file " << path << "...";
+
+	// look for include
+	if (includes.find(path) != includes.end()) {
+		cout << "SKIP" << endl;
+		return list; // already been there
+	}
+
+	cout << endl;
+
+	// add to include list
+	includes.insert(path);
 
 	int fd = open(path.c_str(), O_RDONLY);
 	if (fd == -1) {
@@ -312,88 +175,102 @@ InputExtractor::List Include(std::string path) {
 		return list;
 	}
 
-	Substring str((const char *)memptr, (const char*)memptr + fileinfo.st_size);
+//	Substring str((const char *)memptr, (const char*)memptr + fileinfo.st_size);
+	MemoryString file((char*)memptr, fileinfo.st_size);
 
-	std::string basedir = Basedir(path);
-	list = InputExtractor()(str);
+	std::string basedir = Path::Dir(path);
+	list = (*this)(basedir, file); // follow include
 
-	// add basedir to list for all relative paths
-	for (auto it = list.begin(); it != list.end(); it++) {
-		if (PathRelative(*it))
-			*it = basedir + '/' + *it;
-	}
 	// cleanup
 	munmap(memptr, fileinfo.st_size);
 	close(fd);
 	return list;
+
+	cout << path << "done" << endl;
 }
 
-InputExtractor::List InputExtractor::operator()(const Substring &input){
-	file = input;
+InputExtractor::List InputExtractor::operator()(const Path::Path &file, const MemoryString &str){
 	List result;
 	CommandList IncludeCommands;
 
-	IncludeCommands["input"] = [](List &l, std::string a) {
+	IncludeCommands["input"] = [&file, this](List &l, std::string a) {
 		if (a.empty()) return;
-		if (Extension(a) != ".tex") a += ".tex";
+		if (Path::Extension(a) != ".tex") a += ".tex";
+		// try to make path absolute
+		if (Path::isRelative(a)) {
+			// add current file's path
+			a = Path::Join(file, a);
+		}
+		if (Path::isRelative(a)) {
+			// add process working directory
+			a = Path::Join(fs::cwd(), a);
+		}
+
 		l.push_back(a);
 		// try to extract all inputs of that file
 		auto sub = Include(a);
-		std::copy(sub.begin(), sub.end(), std::inserter(l, l.end()));
+		if (!sub.empty())
+			std::copy(sub.begin(), sub.end(), std::inserter(l, l.end()));
 	};
 
 	IncludeCommands["include"] = IncludeCommands["input"];
 	IncludeCommands["lstinputlisting"] = [](List &l, std::string a){ l.push_back(a); };
 
-	// skip normie text
-	while(file.size()) {
+	MemoryString::const_iterator current = str.begin();
 
-		if (*file.start == '%') {
+	while(current != str.end()) {
+		if (*current == '%') {
 			// line commment
-			while(file.size() > 0 && *file.start != '\n')
-				file.start++;
+			while(current != str.end() && *current != '\n')
+				current++;
 
 			continue;
 		}
-		if (*file.start != '\\') {
-			file.start++;
+		if (*current != '\\') {
+			// skip non macros
+			current++;
 			continue;
 		}
 
 		// read macro name
-		file.start++;
+		current++;
 
-		// TODO: throw exception
-		if (!file.size())
+		if (current == str.end())
 			throw Exception("unexpected EOF");
 
-		Substring name;
-		name.start = name.end = file.start;
-		for(name.end = ++file.start; file.size() > 0 && !isspace(*file.start) && *file.start != '{' && *file.start != '\\'; name.end = (++file.start+1)) {
-			auto searchHit = IncludeCommands.find(name);
-			if ((searchHit = IncludeCommands.find(name)) != IncludeCommands.end()) {
-				file.start++;
-				cout << searchHit->first;
-				cout << "[" << readBrackets(file, "[]") << "]";
-				auto args = readBrackets(file, "{}");
-				cout << ":" << args << endl;
-				searchHit->second(result, macroExpand(args));
-				break;
-			} else if (name == std::string("def")) {
-				file.start++;
+		auto start = current, end = current;
 
-				if (file.size() <= 0 || *file.start != '\\') {
+		auto limiter = [](char c) -> bool { return isspace(c) || c == '{' || c == '\\'; };
+
+		for(; current != str.end() && !limiter(*current); end = (++current+1))
+		{
+			auto searchHit = IncludeCommands.find(std::string(start, end));
+			if (searchHit != IncludeCommands.end()) {
+				// handle crosslink
+				current++;
+				if (current == str.end()) continue;
+
+				cout << searchHit->first << "[" << readBrackets(current, str.end(), "[]") << "]";
+				auto inner = readBrackets(current, str.end(), "{}");
+				cout << ":" << inner << endl;
+
+				// add to results
+				searchHit->second(result, macroExpand(inner));
+				break;
+			} else if (std::string(start, end) == std::string("def")) {
+				// define new macro
+				current++;
+				if (current == str.end() || *current != '\\') {
 					continue;
 				}
-				file.start++;
+				current++;
 
-				Substring name(file.start, file.end);
-				while (file.size() > 0 && *file.start != '{' && !isspace(*file.start)) {
-					name.end = ++file.start;
-				}
+				std::function<bool(const MemoryString::const_iterator&)> limiter = [](const MemoryString::const_iterator &it) -> bool { return std::string("{ \t\n").find(*it) != std::string::npos; };
+
+				std::string name = readTill(current, str.end(), limiter);
 
 				cout << "new macro definition: " << name << endl;
-				macros.insert(std::pair<std::string, Substring>(name.toString(), readBrackets(file, "{}")));
+				macros.insert(std::pair<std::string, std::string>(name, readBrackets(current, str.end(), "{}")));
 				break;
 			}
 		}
@@ -402,17 +279,42 @@ InputExtractor::List InputExtractor::operator()(const Substring &input){
 	return result;
 }
 
-#include <experimental/filesystem>
-
 int main(int argc, char ** args) {
 	// find all the files the given tex files depend on
-	cout << cwd() << std::endl;
 	int fd = 0;
 	struct stat filestat;
 
+
 	for(;argc > 1; --argc) {
+
+		Path::Path filename = args[argc-1];
+		InputExtractor parser;
+
+		InputExtractor::List list = parser.Include(filename);
+
+		// output results in makefile rule style
+
+		Path::Path outfile_name = Path::Basename(filename) + ".d";
+		cout << "writing dependecy rules to " << outfile_name << "...";
+
+		std::ofstream outfile(outfile_name);
+
+		if (!outfile) {
+			cout << "could not create file!" << endl;
+			continue;
+		}
+
+		outfile << filename << ":";
+
+		for (auto it = list.begin(); it != list.end(); it++) {
+			outfile << *it << "\t\\\n";
+		}
+
+		cout << "done" << endl;
+
+		/*
 		char * filename = args[argc-1];
-		cout << "looking at " << filename << std::endl;
+		cout << "opening " << filename << "...";
 
 		// try to open file
 		fd = open(filename, O_RDONLY);
@@ -431,37 +333,41 @@ int main(int argc, char ** args) {
 			continue;
 		}
 
+		cout << "start parsing" << endl;
 
-		//cout << "mmap success, parse file" << endl;
+		MemoryString file((char*)memory_area, filestat.st_size);
 
-		Substring file((const char*)memory_area, (const char*)memory_area + filestat.st_size);
 		try {
-			auto list = InputExtractor()(file);
+			InputExtractor::List list = InputExtractor()(file);
+
+			Path::Path outfilename = Path::Basename(Path::Path(filename)) + ".d";
+
+			cout << "writing makedeps file to " << outfilename << "..." << endl;
+
 			// write in makefile style
-			std::ofstream output(Basename(filename) + ".d");
+			std::ofstream output(outfilename);
 			if (!output) {
 				std::cout << "could not create output file" << std::endl;
 			} else {
 				output << filename << ": ";
 
 				for (auto it = list.begin(); it != list.end(); it++) {
-					output << '\t';
-					if (PathRelative(*it))  {
-						if (PathRelative(filename)) {
-							output << cwd();
+					if (Path::isRelative(*it))  {
+						if (Path::isRelative(filename)) {
+							*it = Path::Join(fs::cwd(), filename, *it);
 						} else {
-							output << Basename(filename);
+							*it = Path::Join(Path::Path(filename), *it);
 						}
-						output << "/" << *it;
-					} else {
-						output << *it;
 					}
-					output << "\t\\\n";
+
+					cout << "depends: " << *it << endl;
+					output << '\t' << *it << "\t\\\n";
 				}
 				output << endl;
 			}
 
-			output.close();
+			cout << filename << done;
+
 		} catch(InputExtractor::Exception &e) {
 			cout << e.what() << endl;
 		}
@@ -469,7 +375,8 @@ int main(int argc, char ** args) {
 		// cleanup
 		munmap(memory_area, filestat.st_size);
 		close(fd);
+
+		*/
 	}
 
-	printf("done\n");
 }
diff --git a/memory_string.hpp b/memory_string.hpp
new file mode 100644
index 0000000..be76162
--- /dev/null
+++ b/memory_string.hpp
@@ -0,0 +1,86 @@
+/*
+ * memoy_string.hpp
+ *
+ *  Created on: 08.10.2017
+ *      Author: julian
+ */
+
+#ifndef MEMORY_STRING_HPP_
+#define MEMORY_STRING_HPP_
+
+#include <iterator>
+
+class MemoryString {
+	template <typename T>
+	struct _iterator : public std::iterator<std::forward_iterator_tag, char> {
+		T* pos;
+		_iterator operator++(int){ _iterator temp(*this); pos++; return temp; }
+		_iterator operator--(int){ _iterator temp(*this); pos--; return temp; }
+
+		_iterator &operator++() { pos++; return *this; }
+		_iterator &operator--() { pos--; return *this; }
+
+		_iterator &operator+=(int i) { pos += i; return *this; }
+		_iterator &operator-=(int i) { pos -= i; return *this; }
+
+		_iterator operator+(int i) { _iterator temp(*this); temp += i; return temp; }
+		_iterator operator-(int i) { _iterator temp(*this); temp -= i; return temp; }
+
+		T operator*() { return *pos; }
+		T operator*() const { return *pos; }
+
+		T * operator&() { return pos; }
+		T * operator->() { return pos; }
+
+		template <typename U>
+		_iterator(const _iterator<U> &other) { *this = other; }
+
+		template <typename U>
+		_iterator &operator=(const _iterator<U> &other) const {
+			if (this != &other) pos = other.pos;
+			return *this;
+		}
+
+		template <typename U>
+		bool operator==(const _iterator<U> &other) const {
+			return pos == other.pos;
+		}
+
+		template <typename U>
+		bool operator!=(const _iterator<U> &other) const {
+			return pos != other.pos;
+		}
+
+	private:
+		_iterator(T *pos) : pos(pos) {}
+		friend MemoryString;
+	};
+
+
+
+public:
+	typedef size_t					size_type;
+	typedef char					value_type;
+
+	typedef _iterator<const value_type> 	const_iterator;
+	typedef _iterator<value_type> 			iterator;
+
+	MemoryString(value_type * base, size_type size): _ptr(base), _size(size) {}
+	~MemoryString() {}
+
+	iterator begin() { return iterator(_ptr); }
+	const_iterator begin() const { return const_iterator(_ptr); }
+
+	iterator end() { return iterator(_ptr + _size); }
+	const_iterator end() const { return const_iterator(_ptr + _size); }
+
+	size_type size() { return _size; }
+protected:
+
+	value_type * _ptr;
+	size_type _size;
+};
+
+
+
+#endif /* MEMORY_STRING_HPP_ */
diff --git a/test.tex b/test.tex
index 27fa66e..e49bd16 100644
--- a/test.tex
+++ b/test.tex
@@ -1,5 +1,15 @@
-\def\hi{hi}
+\documentclass{article}
+\usepackage[ngerman]{babel}
 
-\include{\hi/test.tex}
 
-\lstinputlisting{jkhdfkjlhsdfkjsdhfk}
\ No newline at end of file
+\author{Julian Daube}
+\title{Ein Test}
+
+\begin{document}
+\tableofcontents
+\newpage
+
+$x_a^2 = \alpha \cdot y = \frac{A}{B}$
+
+\input{Einleitung.tex}
+\end{document}
\ No newline at end of file