mirror of
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71 lines
2.8 KiB
C++
71 lines
2.8 KiB
C++
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/*
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* Copyright (c) 2025, Shannon Booth <shannon@serenityos.org>
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* Copyright (c) 2025, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/VM.h>
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#include <LibWeb/HTML/ErrorInformation.h>
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namespace Web::HTML {
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// https://html.spec.whatwg.org/multipage/webappapis.html#extract-error
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ErrorInformation extract_error_information(JS::VM& vm, JS::Value exception)
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{
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// 1. Let attributes be an empty map keyed by IDL attributes.
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ErrorInformation attributes;
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// 2. Set attributes[error] to exception.
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attributes.error = exception;
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// 3. Set attributes[message], attributes[filename], attributes[lineno], and attributes[colno] to
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// implementation-defined values derived from exception.
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attributes.message = [&] {
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if (exception.is_object()) {
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auto& object = exception.as_object();
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if (MUST(object.has_own_property(vm.names.message))) {
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auto message = object.get_without_side_effects(vm.names.message);
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return message.to_string_without_side_effects();
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}
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}
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return MUST(String::formatted("Uncaught exception: {}", exception.to_string_without_side_effects()));
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}();
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// FIXME: This offset is relative to the javascript source. Other browsers appear to do it relative
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// to the entire source document! Calculate that somehow.
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// NB: If we got an Error object, then try and extract the information from the location the object was made.
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if (exception.is_object() && is<JS::Error>(exception.as_object())) {
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auto const& error = static_cast<JS::Error&>(exception.as_object());
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for (auto const& frame : error.traceback()) {
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auto source_range = frame.source_range();
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if (source_range.start.line != 0 || source_range.start.column != 0) {
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attributes.filename = MUST(String::from_byte_string(source_range.filename()));
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attributes.lineno = source_range.start.line;
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attributes.colno = source_range.start.column;
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break;
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}
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}
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}
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// NB: Otherwise, we fall back to try and find the location of the invocation of the function itself.
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else {
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for (ssize_t i = vm.execution_context_stack().size() - 1; i >= 0; --i) {
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auto& frame = vm.execution_context_stack()[i];
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if (frame->executable) {
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auto source_range = frame->executable->source_range_at(frame->program_counter).realize();
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attributes.filename = MUST(String::from_byte_string(source_range.filename()));
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attributes.lineno = source_range.start.line;
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attributes.colno = source_range.start.column;
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break;
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}
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}
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}
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// 4. Return attributes.
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return attributes;
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}
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}
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