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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/core/script/parsed_specifier.h"
#include "third_party/blink/renderer/platform/wtf/text/string_builder.h"
namespace blink {
// <specdef href="https://html.spec.whatwg.org/#resolve-a-module-specifier">
// <specdef label="import-specifier"
// href="https://wicg.github.io/import-maps/#parse-a-url-like-import-specifier">
// This can return a kBare ParsedSpecifier for cases where the spec concepts
// listed above should return failure/null. The users of ParsedSpecifier should
// handle kBare cases properly, depending on contexts and whether import maps
// are enabled.
ParsedSpecifier ParsedSpecifier::Create(const String& specifier,
const KURL& base_url) {
// <spec step="1">Apply the URL parser to specifier. If the result is not
// failure, return the result.</spec>
//
// <spec label="import-specifier" step="2">Let url be the result of parsing
// specifier (with no base URL).</spec>
KURL url(NullURL(), specifier);
if (url.IsValid()) {
// <spec label="import-specifier" step="4">If url’s scheme is either a fetch
// scheme or "std", then return url.</spec>
//
// TODO(hiroshige): This check is done in the callers of ParsedSpecifier.
return ParsedSpecifier(url);
}
// <spec step="2">If specifier does not start with the character U+002F
// SOLIDUS (/), the two-character sequence U+002E FULL STOP, U+002F SOLIDUS
// (./), or the three-character sequence U+002E FULL STOP, U+002E FULL STOP,
// U+002F SOLIDUS (../), return failure.</spec>
//
// <spec label="import-specifier" step="1">If specifier starts with "/", "./",
// or "../", then:</spec>
if (!specifier.StartsWith("/") && !specifier.StartsWith("./") &&
!specifier.StartsWith("../")) {
// Do not consider an empty specifier as a valid bare specifier.
//
// <spec
// href="https://wicg.github.io/import-maps/#normalize-a-specifier-key"
// step="1">If specifierKey is the empty string, then:</spec>
if (specifier.empty())
return ParsedSpecifier();
// <spec label="import-specifier" step="3">If url is failure, then return
// null.</spec>
return ParsedSpecifier(specifier);
}
// <spec step="3">Return the result of applying the URL parser to specifier
// with base URL as the base URL.</spec>
//
// <spec label="import-specifier" step="1.1">Let url be the result of parsing
// specifier with baseURL as the base URL.</spec>
DCHECK(base_url.IsValid());
KURL absolute_url(base_url, specifier);
// <spec label="import-specifier" step="1.3">Return url.</spec>
if (absolute_url.IsValid())
return ParsedSpecifier(absolute_url);
// <spec label="import-specifier" step="1.2">If url is failure, then return
// null.</spec>
return ParsedSpecifier();
}
AtomicString ParsedSpecifier::GetImportMapKeyString() const {
switch (GetType()) {
case Type::kInvalid:
return g_empty_atom;
case Type::kBare:
return AtomicString(bare_specifier_);
case Type::kURL:
return url_.GetString();
}
}
KURL ParsedSpecifier::GetUrl() const {
switch (GetType()) {
case Type::kInvalid:
case Type::kBare:
return NullURL();
case Type::kURL:
return url_;
}
}
} // namespace blink
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