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nix path-info: Add --json flag

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Also, factor out JSON generation from value-to-json.{cc,hh}, and
support producing indented JSON.
This commit is contained in:
Eelco Dolstra 2016-08-26 18:55:55 +02:00
parent 9fa21765e7
commit c0a7b84748
7 changed files with 476 additions and 133 deletions
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71
src/libexpr/value-to-json.hh
View file

@ -8,73 +8,12 @@
namespace nix {
class JSONPlaceholder;
void printValueAsJSON(EvalState & state, bool strict,
Value & v, std::ostream & out, PathSet & context);
Value & v, JSONPlaceholder & out, PathSet & context);
void escapeJSON(std::ostream & str, const string & s);
struct JSONObject
{
std::ostream & str;
bool first;
JSONObject(std::ostream & str) : str(str), first(true)
{
str << "{";
}
~JSONObject()
{
str << "}";
}
void attr(const string & s)
{
if (!first) str << ","; else first = false;
escapeJSON(str, s);
str << ":";
}
void attr(const string & s, const string & t)
{
attr(s);
escapeJSON(str, t);
}
void attr(const string & s, const char * t)
{
attr(s);
escapeJSON(str, t);
}
void attr(const string & s, bool b)
{
attr(s);
str << (b ? "true" : "false");
}
template<typename T>
void attr(const string & s, const T & n)
{
attr(s);
str << n;
}
};
struct JSONList
{
std::ostream & str;
bool first;
JSONList(std::ostream & str) : str(str), first(true)
{
str << "[";
}
~JSONList()
{
str << "]";
}
void elem()
{
if (!first) str << ","; else first = false;
}
void elem(const string & s)
{
elem();
escapeJSON(str, s);
}
};
void printValueAsJSON(EvalState & state, bool strict,
Value & v, std::ostream & str, PathSet & context);
}