void duk_console_init(duk_context *ctx, duk_uint_t flags) {
duk_push_object(ctx);
/* Custom function to format objects; user can replace.
* For now, try JX-formatting and if that fails, fall back
* to ToString(v).
*/
duk_eval_string(ctx,
"(function format(v){"
"try{"
"return Duktape.enc('jx',v);"
"}catch(e){"
"return ''+v;"
"}"
"})");
duk_put_prop_string(ctx, -2, "format");
duk__console_reg_vararg_func(ctx, duk__console_assert, "assert");
duk__console_reg_vararg_func(ctx, duk__console_log, "log");
duk__console_reg_vararg_func(ctx, duk__console_log, "debug"); /* alias to console.log */
duk__console_reg_vararg_func(ctx, duk__console_trace, "trace");
duk__console_reg_vararg_func(ctx, duk__console_info, "info");
duk__console_reg_vararg_func(ctx, duk__console_warn, "warn");
duk__console_reg_vararg_func(ctx, duk__console_error, "error");
duk__console_reg_vararg_func(ctx, duk__console_error, "exception"); /* alias to console.error */
duk__console_reg_vararg_func(ctx, duk__console_dir, "dir");
duk_put_global_string(ctx, "console");
/* Proxy wrapping: ensures any undefined console method calls are
* ignored silently. This is required specifically by the
* DeveloperToolsWG proposal (and is implemented also by Firefox:
* https://bugzilla.mozilla.org/show_bug.cgi?id=629607).
*/
if (flags & DUK_CONSOLE_PROXY_WRAPPER) {
/* Tolerate errors: Proxy may be disabled. */
duk_peval_string_noresult(ctx,
"(function(){"
"var D=function(){};"
"console=new Proxy(console,{"
"get:function(t,k){"
"var v=t[k];"
"return typeof v==='function'?v:D;"
"}"
"});"
"})();"
);
}
}
void duk_console_init(duk_context *ctx, duk_uint_t flags) {
duk_uint_t flags_orig;
/* If both DUK_CONSOLE_STDOUT_ONLY and DUK_CONSOLE_STDERR_ONLY where specified,
* just turn off DUK_CONSOLE_STDOUT_ONLY and keep DUK_CONSOLE_STDERR_ONLY.
*/
if ((flags & DUK_CONSOLE_STDOUT_ONLY) && (flags & DUK_CONSOLE_STDERR_ONLY)) {
flags &= ~DUK_CONSOLE_STDOUT_ONLY;
}
/* Remember the (possibly corrected) flags we received. */
flags_orig = flags;
duk_push_object(ctx);
/* Custom function to format objects; user can replace.
* For now, try JX-formatting and if that fails, fall back
* to ToString(v).
*/
duk_eval_string(ctx,
"(function (E) {"
"return function format(v){"
"try{"
"return E('jx',v);"
"}catch(e){"
"return String(v);" /* String() allows symbols, ToString() internal algorithm doesn't. */
"}"
"};"
"})(Duktape.enc)");
duk_put_prop_string(ctx, -2, "format");
flags = flags_orig;
if (!(flags & DUK_CONSOLE_STDOUT_ONLY) && !(flags & DUK_CONSOLE_STDERR_ONLY)) {
/* No output indicators were specified; these levels go to stdout. */
flags |= DUK_CONSOLE_STDOUT_ONLY;
}
duk__console_reg_vararg_func(ctx, duk__console_assert, "assert", flags);
duk__console_reg_vararg_func(ctx, duk__console_log, "log", flags);
duk__console_reg_vararg_func(ctx, duk__console_log, "debug", flags); /* alias to console.log */
duk__console_reg_vararg_func(ctx, duk__console_trace, "trace", flags);
duk__console_reg_vararg_func(ctx, duk__console_info, "info", flags);
flags = flags_orig;
if (!(flags & DUK_CONSOLE_STDOUT_ONLY) && !(flags & DUK_CONSOLE_STDERR_ONLY)) {
/* No output indicators were specified; these levels go to stderr. */
flags |= DUK_CONSOLE_STDERR_ONLY;
}
duk__console_reg_vararg_func(ctx, duk__console_warn, "warn", flags);
duk__console_reg_vararg_func(ctx, duk__console_error, "error", flags);
duk__console_reg_vararg_func(ctx, duk__console_error, "exception", flags); /* alias to console.error */
duk__console_reg_vararg_func(ctx, duk__console_dir, "dir", flags);
duk_put_global_string(ctx, "console");
/* Proxy wrapping: ensures any undefined console method calls are
* ignored silently. This was required specifically by the
* DeveloperToolsWG proposal (and was implemented also by Firefox:
* https://bugzilla.mozilla.org/show_bug.cgi?id=629607). This is
* apparently no longer the preferred way of implementing console.
* When Proxy is enabled, whitelist at least .toJSON() to avoid
* confusing JX serialization of the console object.
*/
if (flags & DUK_CONSOLE_PROXY_WRAPPER) {
/* Tolerate failure to initialize Proxy wrapper in case
* Proxy support is disabled.
*/
(void) duk_peval_string_noresult(ctx,
"(function(){"
"var D=function(){};"
"var W={toJSON:true};" /* whitelisted */
"console=new Proxy(console,{"
"get:function(t,k){"
"var v=t[k];"
"return typeof v==='function'||W[k]?v:D;"
"}"
"});"
"})();"
);
}
}
