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// Read a tabular cross-reference file generated by ctags, then read a list of
// html files generated by Vim's TOhtml command on C++ code. Link words
// in the html files to cross-references from ctags.
// Usage:
// linkify [tags file] [html files]...
// Still plenty of holes:
// - unnecessarily linking definition location to itself
// - can't detect strings in spite of attempt to support them below, because
// Vim's generated html turns quotes into html entities
// - distinguishing function and variable names
// - distinguishing Mu code in C++ files
// - distinguishing between function overloads
// - if there's duplicate tags we aren't smart enough to distinguish between
// them yet, so we simply don't add any link at all
// - but even that's not perfect, because sometimes the tags file has a
// single definition but there's still multiple overloads (say I defined
// 'clear()' on some type, and it's already defined on STL classes)
struct syminfo {
string filename;
int line_num;
syminfo() :line_num(0) {}
};
bool has_data(istream& in) {
in.peek();
if (in.eof()) return false;
assert(in);
return true;
}
bool starts_with(const string& s, const string& pat) {
string::const_iterator a=s.begin(), b=pat.begin();
for (/*nada*/; a!=s.end() && b!=pat.end(); ++a, ++b)
if (*a != *b) return false;
return b == pat.end();
}
void read_tags(const string& filename, map<string, syminfo>& info) {
ifstream in(filename);
//& cerr << "reading " << filename << '\n';
string dummy;
while (has_data(in)) {
string symbol; in >> symbol;
//& cerr << symbol << '\n';
if (info.find(symbol) != info.end()) {
info[symbol].line_num = -1;
info[symbol].filename.clear();
}
else {
in >> dummy;
in >> info[symbol].line_num;
in >> info[symbol].filename;
}
getline(in, dummy); // skip rest of line
//& cerr << symbol << ": " << info[symbol].filename << ':' << info[symbol].line_num << '\n';
}
in.close();
}
void replace_tags_in_file(const string& filename, const map<string, syminfo>& info) {
//& cerr << info.size() << " symbols\n";
ifstream in(filename);
ofstream out(filename+".out");
while (has_data(in)) {
// send lines that don't start with '<span' straight through
string line;
getline(in, line);
if (!starts_with(line, "<span ")) {
out << line << '\n';
}
else {
static int span_size = string("</span>").size();
int skip_first_span = line.find("</span>") + span_size;
out << line.substr(0, skip_first_span);
istringstream in2(line.substr(skip_first_span));
in2 >> std::noskipws;
while (has_data(in2)) {
if (isspace(in2.peek())) {
//& cerr << "space\n";
char c; in2 >> c;
out << c;
}
// within a line, send straight through all characters inside '<..>'
else if (in2.peek() == '<') {
//& cerr << "tag\n";
char c = '\0';
while (in2 >> c) {
//& cerr << "span: " << c << '\n';
out << c;
if (c == '>') break;
}
//& cerr << "end tag\n";
}
else {
// send straight through all characters inside strings (handling escapes)
char c = in2.get();
if (c == '"') {
//& cerr << "string\n";
out << c;
while (in2 >> c) {
out << c;
if (c == '\\') {
in2 >> c; out << c;
}
else if (c == '"') {
break;
}
}
}
else if (c == '\'') {
//& cerr << "character\n";
out << c;
while (in2 >> c) {
out << c;
if (c == '\\') {
in2 >> c; out << c;
}
else if (c == '\'') {
break;
}
}
}
// send straight through any characters after '//' (comments)
else if (c == '#') {
//& cerr << "comment\n";
out << c;
while (in2 >> c) out << c;
}
// send straight through any characters after '//' (comments)
else if (c == '/' && in2.peek() == '/') {
//& cerr << "comment\n";
out << c;
while (in2 >> c) out << c;
}
else {
//& cerr << "rest\n";
if (c == ',' || c == ':') {
out << c;
continue;
}
ostringstream out2;
out2 << c;
while (in2 >> c) {
if (isspace(c) || c == '<' || c == '"' || c == '\'' || c == '/' || c == ',' || c == ':') { // keep sync'd with other clauses above
in2.putback(c);
break;
}
out2 << c;
}
string symbol = out2.str();
if (symbol == "equal" || symbol == "index" || symbol == "put-index" || symbol == "length") {
//& cerr << " blacklisted\n";
out << symbol;
}
else if (info.find(symbol) == info.end()) {
//& cerr << " no info\n";
out << symbol;
}
else {
const syminfo& s = info.find(symbol)->second;
if (s.filename.empty()) {
//& cerr << " empty info\n";
out << symbol;
}
else {
//& cerr << " link\n";
out << "<a href='" << s.filename << ".html#L" << s.line_num << "'>" << symbol << "</a>";
}
}
} // end rest
}
} // done parsing line
out << '\n';
}
}
in.close(); out.close();
}
int linkify(int argc, const char* argv[]) {
map<string, syminfo> info;
read_tags(argv[1], info);
for (int i = 2; i < argc; ++i) {
replace_tags_in_file(argv[i], info);
}
return 0;
}
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