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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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55
src/libexpr/value-to-json.cc
View file

@ -1,4 +1,5 @@
#include "value-to-json.hh"
#include "json.hh"
#include "eval-inline.hh"
#include "util.hh"
@ -8,24 +9,8 @@
namespace nix {
void escapeJSON(std::ostream & str, const string & s)
{
str << "\"";
for (auto & i : s)
if (i == '\"' || i == '\\') str << "\\" << i;
else if (i == '\n') str << "\\n";
else if (i == '\r') str << "\\r";
else if (i == '\t') str << "\\t";
else if (i >= 0 && i < 32)
str << "\\u" << std::setfill('0') << std::setw(4) << std::hex << (uint16_t) i << std::dec;
else str << i;
str << "\"";
}
void printValueAsJSON(EvalState & state, bool strict,
Value & v, std::ostream & str, PathSet & context)
Value & v, JSONPlaceholder & out, PathSet & context)
{
checkInterrupt();
@ -34,58 +19,58 @@ void printValueAsJSON(EvalState & state, bool strict,
switch (v.type) {
case tInt:
str << v.integer;
out.write(v.integer);
break;
case tBool:
str << (v.boolean ? "true" : "false");
out.write(v.boolean);
break;
case tString:
copyContext(v, context);
escapeJSON(str, v.string.s);
out.write(v.string.s);
break;
case tPath:
escapeJSON(str, state.copyPathToStore(context, v.path));
out.write(state.copyPathToStore(context, v.path));
break;
case tNull:
str << "null";
out.write(nullptr);
break;
case tAttrs: {
Bindings::iterator i = v.attrs->find(state.sOutPath);
if (i == v.attrs->end()) {
JSONObject json(str);
auto obj(out.object());
StringSet names;
for (auto & j : *v.attrs)
names.insert(j.name);
for (auto & j : names) {
Attr & a(*v.attrs->find(state.symbols.create(j)));
json.attr(j);
printValueAsJSON(state, strict, *a.value, str, context);
auto placeholder(obj.placeholder(j));
printValueAsJSON(state, strict, *a.value, placeholder, context);
}
} else
printValueAsJSON(state, strict, *i->value, str, context);
printValueAsJSON(state, strict, *i->value, out, context);
break;
}
case tList1: case tList2: case tListN: {
JSONList json(str);
auto list(out.list());
for (unsigned int n = 0; n < v.listSize(); ++n) {
json.elem();
printValueAsJSON(state, strict, *v.listElems()[n], str, context);
auto placeholder(list.placeholder());
printValueAsJSON(state, strict, *v.listElems()[n], placeholder, context);
}
break;
}
case tExternal:
v.external->printValueAsJSON(state, strict, str, context);
v.external->printValueAsJSON(state, strict, out, context);
break;
case tFloat:
str << v.fpoint;
out.write(v.fpoint);
break;
default:
@ -93,9 +78,15 @@ void printValueAsJSON(EvalState & state, bool strict,
}
}
void printValueAsJSON(EvalState & state, bool strict,
Value & v, std::ostream & str, PathSet & context)
{
JSONPlaceholder out(str);
printValueAsJSON(state, strict, v, out, context);
}
void ExternalValueBase::printValueAsJSON(EvalState & state, bool strict,
std::ostream & str, PathSet & context) const
JSONPlaceholder & out, PathSet & context) const
{
throw TypeError(format("cannot convert %1% to JSON") % showType());
}