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v/vlib/builtin/js/builtin.js.v

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module builtin
import strings
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// used to generate JS throw statements.
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pub fn js_throw(s any) {
#throw s
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}
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#let globalPrint;
$if js_freestanding {
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#globalPrint = globalThis.print
}
pub fn println(s string) {
$if js_freestanding {
#globalPrint(s.str)
} $else {
#console.log(s.str)
}
}
pub fn print(s string) {
$if js_node {
#$process.stdout.write(s.str)
} $else {
panic('Cannot `print` in a browser, use `println` instead')
}
}
pub fn eprintln(s string) {
$if js_freestanding {
#globalPrint(s.str)
} $else {
#console.error(s.str)
}
}
pub fn eprint(s string) {
$if js_node {
#$process.stderr.write(s.str)
} $else {
panic('Cannot `eprint` in a browser, use `println` instead')
}
}
// Exits the process in node, and halts execution in the browser
// because `process.exit` is undefined. Workaround for not having
// a 'real' way to exit in the browser.
pub fn exit(c int) {
JS.process.exit(c)
js_throw('exit($c)')
}
fn opt_ok(data voidptr, option Option) {
#option.state = 0
#option.err = none__
#option.data = data
}
pub fn unwrap(opt string) string {
mut o := Option{}
#o = opt
if o.state != 0 {
js_throw(o.err)
}
mut res := ''
#res = opt.data
return res
}
pub fn (r rune) str() string {
res := ''
mut sb := strings.new_builder(5)
#res.str = r.valueOf().toString()
sb.write_string(res)
return sb.str()
}