utils.cc

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#include "utils.hh"
#include <iostream>

std::string esc_str(std::string const & s)
{
    std::string t;
    bool f = false; // flag for previous extensible escape
    for (auto i:s) {
        if (f&&i>='0'&&i<'8') { // escaped with hex or oct
            t += "\"\""; // escape terminating concatenation
            t += i;
            f = false;
            continue;
        }
        f = false;
        if (i=='\\') {t += "\\\\"; continue;}
        if (i=='"') {t += "\\\""; continue;}
        if (isprint(i)) {t += i; continue;}
        if (i=='\n') {t += "\\n"; continue;}
        if (i=='\r') {t += "\\r"; continue;}
        if (i=='\t') {t += "\\t"; continue;}
        int r = (unsigned char) i;
        t += '\\';
        if (r>64) t += char('0'+r/64);
        if (r>8) t += char('0'+r%64/8);
        t += char('0'+r%8);
        f = true;
    }
    return t;
}

enum MsgLevel {
    MSGL_ERROR = 0,
    MSGL_WARN = 1,
    MSGL_INFO = 2,
    MSGL_DEBUG = 9,
    MSGL_ALL = 10
};

int msg_level = MSGL_INFO; 
std::ostream & msg(int l)
{
    static std::ostream null_stream(0);
    return msg_level>=l ? std::cerr : null_stream;
}
std::ostream & debug = msg(MSGL_DEBUG); 
std::ostream & info = msg(MSGL_INFO); 
std::ostream & warn = msg(MSGL_WARN); 

void error(std::string const & m)
{
    msg(0) << "Error: " << m << '\n';
    throw Error(m);
}