barrier/server/CConfig.cpp

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#include "CConfig.h"
#include "stdistream.h"
#include "stdostream.h"
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#include <assert.h>
//
// CConfig
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//
CConfig::CConfig()
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{
// do nothing
}
CConfig::~CConfig()
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{
// do nothing
}
void CConfig::addScreen(const CString& name)
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{
if (m_map.count(name) != 0) {
assert(0 && "name already in map"); // FIXME -- throw instead
}
m_map.insert(std::make_pair(name, CCell()));
}
void CConfig::removeScreen(const CString& name)
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{
CCellMap::iterator index = m_map.find(name);
if (index == m_map.end()) {
assert(0 && "name not in map"); // FIXME -- throw instead
}
// remove from map
m_map.erase(index);
// disconnect
for (index = m_map.begin(); index != m_map.end(); ++index) {
CCell& cell = index->second;
for (SInt32 i = 0; i <= kLastDirection - kFirstDirection; ++i)
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if (cell.m_neighbor[i] == name) {
cell.m_neighbor[i].erase();
}
}
}
void CConfig::removeAllScreens()
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{
m_map.clear();
}
void CConfig::connect(const CString& srcName,
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EDirection srcSide,
const CString& dstName)
{
// find source cell
CCellMap::iterator index = m_map.find(srcName);
if (index == m_map.end()) {
assert(0 && "name not in map"); // FIXME -- throw instead
}
// connect side (overriding any previous connection)
index->second.m_neighbor[srcSide - kFirstDirection] = dstName;
}
void CConfig::disconnect(const CString& srcName,
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EDirection srcSide)
{
// find source cell
CCellMap::iterator index = m_map.find(srcName);
if (index == m_map.end()) {
assert(0 && "name not in map"); // FIXME -- throw instead
}
// disconnect side
index->second.m_neighbor[srcSide - kFirstDirection].erase();
}
bool CConfig::isValidScreenName(const CString& name) const
{
// name is valid if matches validname
// name ::= [A-Za-z0-9] | [A-Za-z0-9][-A-Za-z0-9]*[A-Za-z0-9]
// domain ::= . name
// validname ::= name domain*
// check each dot separated part
CString::size_type b = 0;
for (;;) {
// find end of part
CString::size_type e = name.find('.', b);
if (e == CString::npos) {
e = name.size();
}
// part may not be empty
if (e - b < 1) {
return false;
}
// check first and last characters
if (!isalnum(name[b]) || !isalnum(name[e - 1])) {
return false;
}
// check interior characters
for (CString::size_type i = b; i < e; ++i) {
if (!isalnum(name[i]) && name[i] != '-') {
return false;
}
}
// next part
if (e == name.size()) {
// no more parts
break;
}
b = e + 1;
}
return true;
}
CConfig::const_iterator CConfig::begin() const
{
return const_iterator(m_map.begin());
}
CConfig::const_iterator CConfig::end() const
{
return const_iterator(m_map.end());
}
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bool CConfig::isScreen(const CString& name) const
{
return (m_map.count(name) > 0);
}
CString CConfig::getNeighbor(const CString& srcName,
EDirection srcSide) const
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{
// find source cell
CCellMap::const_iterator index = m_map.find(srcName);
if (index == m_map.end()) {
assert(0 && "name not in map"); // FIXME -- throw instead
}
// return connection
return index->second.m_neighbor[srcSide - kFirstDirection];
}
const char* CConfig::dirName(EDirection dir)
{
static const char* s_name[] = { "left", "right", "top", "bottom" };
return s_name[dir - kFirstDirection];
}
bool CConfig::readLine(std::istream& s, CString& line)
{
s >> std::ws;
while (std::getline(s, line)) {
// strip comments and then trailing whitespace
CString::size_type i = line.rfind('#');
if (i != CString::npos) {
line.erase(i);
}
i = line.find_last_not_of(" \t");
if (i != CString::npos) {
line.erase(i + 1);
}
// return non empty line
if (!line.empty()) {
return true;
}
s >> std::ws;
}
return false;
}
void CConfig::readSection(std::istream& s)
{
static const char s_section[] = "section:";
static const char s_screens[] = "screens";
static const char s_links[] = "links";
CString line;
if (!readLine(s, line)) {
// no more sections
return;
}
// should be a section header
if (line.find(s_section) != 0) {
throw XConfigRead("found data outside section");
}
// get section name
CString::size_type i = line.find_first_not_of(" \t", sizeof(s_section) - 1);
if (i == CString::npos) {
throw XConfigRead("section name is missing");
}
CString name = line.substr(i);
i = name.find_first_of(" \t");
if (i != CString::npos) {
throw XConfigRead("unexpected data after section name");
}
// read section
if (name == s_screens) {
readSectionScreens(s);
}
else if (name == s_links) {
readSectionLinks(s);
}
else {
throw XConfigRead("unknown section name");
}
}
void CConfig::readSectionScreens(std::istream& s)
{
CString line;
CString name;
while (readLine(s, line)) {
// check for end of section
if (line == "end") {
return;
}
// see if it's the next screen
if (line[line.size() - 1] == ':') {
// strip :
name = line.substr(0, line.size() - 1);
// verify validity of screen name
if (!isValidScreenName(name)) {
throw XConfigRead("invalid screen name");
}
// add the screen to the configuration
addScreen(name);
}
else if (name.empty()) {
throw XConfigRead("argument before first screen");
}
else {
throw XConfigRead("unknown argument");
}
}
throw XConfigRead("unexpected end of screens section");
}
void CConfig::readSectionLinks(std::istream& s)
{
CString line;
CString screen;
while (readLine(s, line)) {
// check for end of section
if (line == "end") {
return;
}
// see if it's the next screen
if (line[line.size() - 1] == ':') {
// strip :
screen = line.substr(0, line.size() - 1);
// verify we known about the screen
if (!isScreen(screen)) {
throw XConfigRead("unknown screen name");
}
}
else if (screen.empty()) {
throw XConfigRead("argument before first screen");
}
else {
// parse argument: `<name>=<value>'
CString::size_type i = line.find_first_of(" \t=");
if (i == 0) {
throw XConfigRead("missing argument name");
}
if (i == CString::npos) {
throw XConfigRead("missing = in argument");
}
CString name = line.substr(0, i);
i = line.find_first_not_of(" \t", i);
if (i == CString::npos || line[i] != '=') {
throw XConfigRead("missing = in argument");
}
i = line.find_first_not_of(" \t", i + 1);
CString value;
if (i != CString::npos) {
value = line.substr(i);
}
// handle argument
if (name == "left") {
if (!isScreen(value)) {
throw XConfigRead("unknown screen");
}
connect(screen, kLeft, value);
}
else if (name == "right") {
if (!isScreen(value)) {
throw XConfigRead("unknown screen");
}
connect(screen, kRight, value);
}
else if (name == "up") {
if (!isScreen(value)) {
throw XConfigRead("unknown screen");
}
connect(screen, kTop, value);
}
else if (name == "down") {
if (!isScreen(value)) {
throw XConfigRead("unknown screen");
}
connect(screen, kBottom, value);
}
else {
// unknown argument
throw XConfigRead("unknown argument");
}
}
}
throw XConfigRead("unexpected end of links section");
}
//
// CConfig I/O
//
std::istream& operator>>(std::istream& s, CConfig& config)
{
// FIXME -- should track line and column to improve error reporting
CConfig tmp;
while (s) {
tmp.readSection(s);
}
config = tmp;
return s;
}
std::ostream& operator<<(std::ostream& s, const CConfig& config)
{
// screens section
s << "section: screens" << std::endl;
for (CConfig::const_iterator screen = config.begin();
screen != config.end(); ++screen) {
s << "\t" << screen->c_str() << ":" << std::endl;
}
s << "end" << std::endl;
// links section
CString neighbor;
s << "section: links" << std::endl;
for (CConfig::const_iterator screen = config.begin();
screen != config.end(); ++screen) {
s << "\t" << screen->c_str() << ":" << std::endl;
neighbor = config.getNeighbor(*screen, CConfig::kLeft);
if (!neighbor.empty()) {
s << "\t\tleft=" << neighbor.c_str() << std::endl;
}
neighbor = config.getNeighbor(*screen, CConfig::kRight);
if (!neighbor.empty()) {
s << "\t\tright=" << neighbor.c_str() << std::endl;
}
neighbor = config.getNeighbor(*screen, CConfig::kTop);
if (!neighbor.empty()) {
s << "\t\tup=" << neighbor.c_str() << std::endl;
}
neighbor = config.getNeighbor(*screen, CConfig::kBottom);
if (!neighbor.empty()) {
s << "\t\tdown=" << neighbor.c_str() << std::endl;
}
}
s << "end" << std::endl;
return s;
}
//
// CConfig I/O exceptions
//
XConfigRead::XConfigRead(const CString& error) : m_error(error)
{
// do nothing
}
XConfigRead::~XConfigRead()
{
// do nothing
}
CString XConfigRead::getWhat() const throw()
{
return m_error;
}