80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
// These are useful methods inside the nix library that ought to be exported.
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// Since they are not, copy/paste them here.
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// TODO: Delete these and use the ones in the library as they become available.
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#include <nix/config.h> // for nix/globals.hh's reference to SYSTEM
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#include "libnix-copy-paste.hh"
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#include <boost/format/alt_sstream.hpp> // for basic_altstringbuf...
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#include <boost/format/alt_sstream_impl.hpp> // for basic_altstringbuf...
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#include <boost/optional/optional.hpp> // for get_pointer
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#include <iostream> // for operator<<, basic_...
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#include <nix/types.hh> // for Strings
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#include <nix/error.hh> // for Error
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#include <string> // for string, basic_string
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using nix::Error;
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using nix::Strings;
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using std::string;
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// From nix/src/libexpr/attr-path.cc
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Strings parseAttrPath(const string & s)
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{
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Strings res;
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string cur;
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string::const_iterator i = s.begin();
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while (i != s.end()) {
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if (*i == '.') {
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res.push_back(cur);
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cur.clear();
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} else if (*i == '"') {
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++i;
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while (1) {
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if (i == s.end())
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throw Error("missing closing quote in selection path '%1%'", s);
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if (*i == '"')
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break;
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cur.push_back(*i++);
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}
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} else
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cur.push_back(*i);
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++i;
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}
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if (!cur.empty())
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res.push_back(cur);
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return res;
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}
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// From nix/src/nix/repl.cc
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bool isVarName(const string & s)
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{
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if (s.size() == 0)
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return false;
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char c = s[0];
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if ((c >= '0' && c <= '9') || c == '-' || c == '\'')
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return false;
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for (auto & i : s)
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if (!((i >= 'a' && i <= 'z') || (i >= 'A' && i <= 'Z') || (i >= '0' && i <= '9') || i == '_' || i == '-' ||
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i == '\''))
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return false;
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return true;
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}
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// From nix/src/nix/repl.cc
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std::ostream & printStringValue(std::ostream & str, const char * string)
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{
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str << "\"";
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for (const char * i = string; *i; i++)
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if (*i == '\"' || *i == '\\')
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str << "\\" << *i;
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else if (*i == '\n')
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str << "\\n";
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else if (*i == '\r')
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str << "\\r";
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else if (*i == '\t')
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str << "\\t";
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else
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str << *i;
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str << "\"";
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return str;
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}
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