ref: 051d504cfbe8f6034ba18df72858b62b1d8570b4
dir: /json.c/
#include "jsi.h"
#include "jslex.h"
#include "jsvalue.h"
#include "jsbuiltin.h"
#include "utf.h"
static void jsonnext(js_State *J)
{
J->lookahead = jsY_lexjson(J);
}
static int jsonaccept(js_State *J, int t)
{
if (J->lookahead == t) {
jsonnext(J);
return 1;
}
return 0;
}
static void jsonexpect(js_State *J, int t)
{
if (!jsonaccept(J, t))
js_syntaxerror(J, "JSON: unexpected token: %s (expected %s)",
jsY_tokenstring(J->lookahead), jsY_tokenstring(t));
}
static void jsonvalue(js_State *J)
{
int i;
const char *name;
switch (J->lookahead) {
case TK_STRING:
js_pushliteral(J, J->text);
jsonnext(J);
break;
case TK_NUMBER:
js_pushnumber(J, J->number);
jsonnext(J);
break;
case '{':
js_newobject(J);
jsonnext(J);
if (jsonaccept(J, '}'))
return;
do {
if (J->lookahead != TK_STRING)
js_syntaxerror(J, "JSON: unexpected token: %s (expected string)", jsY_tokenstring(J->lookahead));
name = J->text;
jsonnext(J);
jsonexpect(J, ':');
jsonvalue(J);
js_setproperty(J, -2, name);
} while (jsonaccept(J, ','));
jsonexpect(J, '}');
break;
case '[':
js_newarray(J);
jsonnext(J);
i = 0;
if (jsonaccept(J, ']'))
return;
do {
jsonvalue(J);
js_setindex(J, -2, i++);
} while (jsonaccept(J, ','));
jsonexpect(J, ']');
break;
case TK_TRUE:
js_pushboolean(J, 1);
jsonnext(J);
break;
case TK_FALSE:
js_pushboolean(J, 0);
jsonnext(J);
break;
case TK_NULL:
js_pushnull(J);
jsonnext(J);
break;
default:
js_syntaxerror(J, "JSON: unexpected token: %s", jsY_tokenstring(J->lookahead));
}
}
static void JSON_parse(js_State *J)
{
const char *source = js_tostring(J, 1);
jsY_initlex(J, "JSON", source);
jsonnext(J);
jsonvalue(J);
// TODO: reviver Walk()
}
static void fmtnum(js_State *J, js_Buffer **sb, double n)
{
if (isnan(n)) js_puts(J, sb, "null");
else if (isinf(n)) js_puts(J, sb, "null");
else if (n == 0) js_puts(J, sb, "0");
else {
char buf[40];
sprintf(buf, "%.17g", n);
js_puts(J, sb, buf);
}
}
static void fmtstr(js_State *J, js_Buffer **sb, const char *s)
{
static const char *HEX = "0123456789ABCDEF";
Rune c;
js_putc(J, sb, '"');
while (*s) {
s += chartorune(&c, s);
switch (c) {
case '"': js_puts(J, sb, "\\\""); break;
case '\\': js_puts(J, sb, "\\\\"); break;
case '\b': js_puts(J, sb, "\\b"); break;
case '\f': js_puts(J, sb, "\\f"); break;
case '\n': js_puts(J, sb, "\\n"); break;
case '\r': js_puts(J, sb, "\\r"); break;
case '\t': js_puts(J, sb, "\\t"); break;
default:
if (c < ' ') {
js_puts(J, sb, "\\u");
js_putc(J, sb, HEX[(c>>12)&15]);
js_putc(J, sb, HEX[(c>>8)&15]);
js_putc(J, sb, HEX[(c>>4)&15]);
js_putc(J, sb, HEX[c&15]);
} else {
js_putc(J, sb, c); break;
}
}
}
js_putc(J, sb, '"');
}
static void fmtindent(js_State *J, js_Buffer **sb, const char *gap, int level)
{
js_putc(J, sb, '\n');
while (level--)
js_puts(J, sb, gap);
}
static int fmtvalue(js_State *J, js_Buffer **sb, const char *key, const char *gap, int level);
static void fmtobject(js_State *J, js_Buffer **sb, js_Object *obj, const char *gap, int level)
{
js_Property *ref;
int save;
int n = 0;
js_putc(J, sb, '{');
for (ref = obj->head; ref; ref = ref->next) {
if (ref->atts & JS_DONTENUM)
continue;
save = (*sb)->n;
if (n) js_putc(J, sb, ',');
if (gap) fmtindent(J, sb, gap, level + 1);
fmtstr(J, sb, ref->name);
js_putc(J, sb, ':');
if (gap)
js_putc(J, sb, ' ');
js_pushvalue(J, ref->value);
if (!fmtvalue(J, sb, ref->name, gap, level + 1))
(*sb)->n = save;
else
++n;
js_pop(J, 1);
}
if (gap && n) fmtindent(J, sb, gap, level);
js_putc(J, sb, '}');
}
static void fmtarray(js_State *J, js_Buffer **sb, const char *gap, int level)
{
unsigned int n, k;
char buf[40];
n = js_getlength(J, -1);
js_putc(J, sb, '[');
for (k = 0; k < n; ++k) {
if (k) js_putc(J, sb, ',');
if (gap) fmtindent(J, sb, gap, level + 1);
sprintf(buf, "%u", k);
js_getproperty(J, -1, buf);
if (!fmtvalue(J, sb, buf, gap, level + 1))
js_puts(J, sb, "null");
js_pop(J, 1);
}
if (gap && n) fmtindent(J, sb, gap, level);
js_putc(J, sb, ']');
}
static int fmtvalue(js_State *J, js_Buffer **sb, const char *key, const char *gap, int level)
{
if (js_try(J)) {
js_free(J, *sb);
js_throw(J);
}
if (js_isobject(J, -1)) {
if (js_hasproperty(J, -1, "toJSON")) {
if (js_iscallable(J, -1)) {
js_copy(J, -2);
js_pushliteral(J, key);
js_call(J, 1);
js_rot2pop1(J);
} else {
js_pop(J, 1);
}
}
}
js_endtry(J);
// TODO: replacer()
if (js_isobject(J, -1) && !js_iscallable(J, -1)) {
js_Object *obj = js_toobject(J, -1);
switch (obj->type) {
case JS_CNUMBER: fmtnum(J, sb, obj->u.number); break;
case JS_CSTRING: fmtstr(J, sb, obj->u.s.string); break;
case JS_CBOOLEAN: js_puts(J, sb, obj->u.boolean ? "true" : "false"); break;
case JS_CARRAY: fmtarray(J, sb, gap, level); break;
default: fmtobject(J, sb, obj, gap, level); break;
}
}
else if (js_isboolean(J, -1))
js_puts(J, sb, js_toboolean(J, -1) ? "true" : "false");
else if (js_isnumber(J, -1))
fmtnum(J, sb, js_tonumber(J, -1));
else if (js_isstring(J, -1))
fmtstr(J, sb, js_tostring(J, -1));
else if (js_isnull(J, -1))
js_puts(J, sb, "null");
else
return 0;
return 1;
}
static void JSON_stringify(js_State *J)
{
js_Buffer *sb = NULL;
char buf[12];
const char *s, *gap;
int n;
gap = NULL;
if (js_isnumber(J, 3)) {
n = js_tointeger(J, 3);
if (n < 0) n = 0;
if (n > 10) n = 10;
memset(buf, ' ', n);
buf[n] = 0;
if (n > 0) gap = buf;
} else if (js_isstring(J, 3)) {
s = js_tostring(J, 3);
n = strlen(s);
if (n > 10) n = 10;
memcpy(buf, s, n);
buf[n] = 0;
if (n > 0) gap = buf;
}
// TODO: replacer
if (js_isdefined(J, 1)) {
js_copy(J, 1);
if (fmtvalue(J, &sb, "", gap, 0)) {
js_putc(J, &sb, 0);
if (js_try(J)) {
js_free(J, sb);
js_throw(J);
}
js_pushstring(J, sb ? sb->s : "");
js_endtry(J);
js_free(J, sb);
}
} else {
js_pushundefined(J);
}
}
void jsB_initjson(js_State *J)
{
js_pushobject(J, jsV_newobject(J, JS_CJSON, J->Object_prototype));
{
jsB_propf(J, "parse", JSON_parse, 2);
jsB_propf(J, "stringify", JSON_stringify, 3);
}
js_defglobal(J, "JSON", JS_DONTENUM);
}