/* This file contains auxiliary functions that do text or number formatting */

void replace_whitespace(string &code)
{
    // -- Replaces all whitespace within string --
    for (char &c : code)
    {
        if (isspace(c))
        {
            c = ' ';
        }
    }
}

string fix_identifier(string ident, bool isVar, compiler_state &state)
{
    // -- Replaces invalid C++ characters in internal and external identifiers --
    // when state is provided to fix_identifier it can fix external variables too.
    if (is_external(ident, state))
    {
        return fix_external_identifier(ident, isVar);
    }
    else
    {
        return fix_identifier(ident, isVar);
    }
}

string fix_identifier(string identifier, bool isVariable)
{
    // -- Appends a prefix based on its type to an identifier --
    return string(isVariable ? "VAR_" : "SUBPR_") + fix_identifier(identifier);
}

string fix_identifier(string identifier)
{
    // -- Replaces invalid C++ characters in identifiers --
    const string validChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890:";
    ostringstream new_id;
    for (unsigned int i = 0; i < identifier.size(); ++i)
    {
        if (validChars.find(identifier[i]) != string::npos)
        {
            new_id << identifier[i];
        }
        else
        {
            new_id << "c" << (unsigned int)identifier[i] << "_";
        }
    }
    return new_id.str();
}

string fix_external_identifier(string identifier, bool isVariable)
{
    // -- Replaces invalid C++ characters in external identifiers --
    // External identifiers are used by C++ extensions and thus have a simpler but
    // more restrictive name mangling algorithm: The only characters allowed are
    // `A-Z`, `0-9`, and `_`. All other characters are converted to `_`.
    const string validChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890:";
    string new_id;
    for (unsigned int i = 0; i < identifier.size(); ++i)
    {
        if (validChars.find(identifier[i]) != string::npos)
        {
            new_id += identifier[i];
        }
        else
        {
            new_id += "_";
        }
    }
    return new_id;
}

string &escape_c_quotes(string &str)
{
    // -- Replaces all " in the passed string for \" --
    for (unsigned int i = 0; i < str.size(); ++i)
    {
        if (str[i] == '"')
        {
            str.erase(i, 1);
            str.insert(i, "\\\"");
            ++i;
        }
    }
    return str;
}

string expandHomeDirectory(string &filename)
{
    // -- Expands a home directory (normaly when the character ~ is used) --
#if defined(_WIN32)
    return filename;
#else
    string homeDir = exec("echo $HOME");
    trim(homeDir);
    string newPath = "";
    for (size_t i = 0; i < filename.length(); ++i)
    {
        if (filename[i] == '~')
        {
            newPath += homeDir;
        }
        else
        {
            newPath += filename[i];
        }
    }
    return newPath;
#endif
}