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

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module builtin
// used to generate JS throw statements.
[noreturn]
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pub fn js_throw(s any) {
#throw s
for {}
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}
#let globalPrint, globalWrite;
$if js_freestanding {
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#globalPrint = globalThis.print
#globalWrite = (typeof globalThis.write === 'function')? write: globalThis.print
}
pub fn flush_stdout() {
// needed for parity with builtin.c.v
}
pub fn flush_stderr() {
// needed for parity with builtin.c.v
}
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 $if js_freestanding {
#globalWrite(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)
} $else {
panic('Cannot `eprint` in a browser, use `println` instead')
}
}
// Exits the process in node, and halts execution in the browser
// because `process.exit` is undefined. Workaround for not having
// a 'real' way to exit in the browser.
[noreturn]
pub fn exit(c int) {
JS.process.exit(c)
js_throw('exit(${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
}
fn js_stacktrace() string {
stacktrace := ''
#let err = new TypeError();
#err.name = 'stacktrace: '
#stacktrace.str = err.stack
return stacktrace
}
pub fn print_backtrace() {
println(js_stacktrace())
}
// Check for nil value
pub fn isnil(val voidptr) bool {
res := false
// This one is kinda weird. In C and native backend we can cast booleans and integers to pointers
// so we just check *for* all possible NULL-like values here.
#if (typeof val == 'function') { res.val = false; } else {
#val = val instanceof voidptr ? val.valueOf().val : val;
#res.val = val === null || val === undefined || val === false || val === 0 || val === BigInt(0) || (val instanceof int ? val.val == 0 : false)
#}
return res
}
pub fn (f float_literal) str() string {
res := ''
#res.str += f.valueOf()
return res
}