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psyced/world/net/library/json.c

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#include <net.h>
#include <proto.h>
// pike code can be made to run in lpc and the other way round..
#include "jsonparser.pike"
// see http://about.psyc.eu/Serialisation on the merits of JSON
//
// this function is useful if we decide to use json for complex data
// (or rather cannot come up with something better)
//
string make_json(mixed d) {
if (stringp(d)) {
#if 1
string *x;
// this code runs on the presumption that the regexplode
// will hardly ever encounter anything. should these chars
// be commonplace, then the 7 regreplace approach would be
// more efficient.
x = regexplode(d, "(\"|\\\\|\n|\t|\b|\r|\f)");
if (sizeof(x) > 1) {
int i;
for (i=sizeof(x)-2; i >= 0; i-=2) {
switch(x[i]) {
case "\"": x[i] = "\\\""; break; // common stuff
case "\n": x[i] = "\\n"; break;
case "\t": x[i] = "\\t"; break;
case "\b": x[i] = "\\b"; break; // these chars should
case "\r": x[i] = "\\r"; break; // not appear in psyc
case "\f": x[i] = "\\f"; break; // strings anyway.. !?
case "\\": x[i] = "\\\\"; break;
default:
raise_error(S("encountered %O in %O\n", x[i], d));
}
P4((" .. encountered %O", x[i]));
}
P4((" .. result: %O\n", d))
}
return "\""+ implode(x, "") +"\"";
#else
// what i don't like about this thing is 7 calls of regreplace
// for every damn little string.
d = regreplace(d, "\n", "\\n", 1);
d = regreplace(d, "\t", "\\t", 1);
d = regreplace(d, "\b", "\\b", 1);
d = regreplace(d, "\r", "\\r", 1);
d = regreplace(d, "\f", "\\f", 1);
//d = regreplace(d, "\u", "\\u", 1); // unicode..???
d = regreplace(d, "\"", "\\\"", 1);
d = regreplace(d, "\\\\", "\\\\\\\\", 1);
return "\""+ d +"\"";
#endif
} else if (intp(d)) {
return to_string(d);
} else if (pointerp(d)) {
return "[ " + implode(map(d, #'make_json), ", ") + " ]";
} else if (mappingp(d)) {
#if 0
return "{ " + implode(map(d,
(: return $1 + " : " + make_json($2[0]); :)),
", ") + " }";
#else
// mixed x = map(d,
// (: return make_json($1) +" : "+ make_json($2); :));
// let's presume a key of type string doesnt contain evil chars
mixed x = map(d,
(: return (stringp($1) ? ("\""+ $1 +"\"") : make_json($1))
+":"+ make_json($2); :));
P3(("\nintermediate: %O\n", m_values(x)))
return "{"+ implode(m_values(x), ",") +"}";
#endif
2009-01-26 20:12:53 +00:00
} else if (objectp(d))
return "\'"+ psyc_name(d) +"\'";
return "00";
}
// see also net/place/storic.c for a JSON generator limited and optimized
// to the output of HTML-quoted strings.