#include <u.h>#include <libc.h>#include <json.h> static int printjson(Fmt*, JSON*, int);static int printarray(Fmt*, JSON*, int);static int printobject(Fmt*, JSON*, int); static intprintstring(Fmt *f, char *s){	Rune r;	int n; 	n = fmtstrcpy(f, "\"");	while(*s){		s += chartorune(&r, s);		switch(r){		case '\\':	n += fmtstrcpy(f, "\\\\");	break;		case '\f':	n += fmtstrcpy(f, "\\f");	break;		case '\b':	n += fmtstrcpy(f, "\\b");	break;		case '\n':	n += fmtstrcpy(f, "\\n");	break;		case '\r':	n += fmtstrcpy(f, "\\r");	break;		case '\"':	n += fmtstrcpy(f, "\\\"");	break;		default:			if(r < 0x20)				n += fmtprint(f, "\\u%04x", r);			else				n += fmtrune(f, r);		}	}	n += fmtstrcpy(f, "\"");	return n;} static intprintarray(Fmt *f, JSON *j, int indent){	JSONEl *jl;	int i, r; 	if(j->first == nil){		return fmtprint(f, "[]");	}	r = fmtprint(f, "[\n");	for(jl = j->first; jl != nil; jl = jl->next){		for(i = 0; i < indent; i++)			r += fmtprint(f, "\t");		r += printjson(f, jl->val, indent);		r += fmtprint(f, "%s\n", jl->next != nil ? "," : "");	}	for(i = 0; i < indent-1; i++)		r += fmtprint(f, "\t");	r += fmtprint(f, "]");	return r;} static intprintobject(Fmt *f, JSON *j, int indent){	JSONEl *jl;	int i, r; 	if(j->first == nil){		return fmtprint(f, "{}");	}	r = fmtprint(f, "{\n");	for(jl = j->first; jl != nil; jl = jl->next){		for(i = 0; i < indent; i++)			fmtprint(f, "\t");		r += fmtprint(f, "\"%s\": ", jl->name);		r += printjson(f, jl->val, indent);		r += fmtprint(f, "%s\n", jl->next != nil ? "," : "");	}	for(i = 0; i < indent-1; i++)		r += fmtprint(f, "\t");	r += fmtprint(f, "}");	return r;} static intprintjson(Fmt *f, JSON *j, int indent){	switch(j->t){	case JSONNull:		return fmtprint(f, "null");		break;	case JSONBool:		return fmtprint(f, "%s", j->n ? "true" : "false");		break;	case JSONNumber:		return fmtprint(f, "%f", j->n);		break;	case JSONString:		return printstring(f, j->s);		break;	case JSONArray:		return printarray(f, j, indent+1);		break;	case JSONObject:		return printobject(f, j, indent+1);		break;	}	return 0;} intJSONfmt(Fmt *f){	JSON *j; 	j = va_arg(f->args, JSON*);	return printjson(f, j, 0);} voidJSONfmtinstall(void){	fmtinstall('J', JSONfmt);}