зеркало из https://github.com/mozilla/gecko-dev.git
93 строки
3.1 KiB
C++
93 строки
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=2 sw=2 et tw=78: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef mozilla_ImportScanner_h
|
|
#define mozilla_ImportScanner_h
|
|
|
|
/* A simple best-effort scanner for @import rules for the HTML parser */
|
|
|
|
#include "nsString.h"
|
|
#include "nsTArray.h"
|
|
|
|
namespace mozilla {
|
|
|
|
struct ImportScanner final {
|
|
ImportScanner() = default;
|
|
|
|
// Called when a <style> element starts.
|
|
//
|
|
// Note that this function cannot make assumptions about the internal state,
|
|
// as you can nest <svg:style> elements.
|
|
void Start();
|
|
|
|
// Called when a <style> element ends. Returns the list of URLs scanned.
|
|
nsTArray<nsString> Stop();
|
|
|
|
// Whether Scan() should be called.
|
|
bool ShouldScan() const {
|
|
return mState != State::OutsideOfStyleElement && mState != State::Done;
|
|
}
|
|
|
|
// Scan() should be called when text content is parsed, and returns an array
|
|
// of found URLs, if any.
|
|
//
|
|
// Asserts ShouldScan() returns true.
|
|
nsTArray<nsString> Scan(Span<const char16_t> aFragment);
|
|
|
|
private:
|
|
enum class State {
|
|
// Initial state, doesn't scan anything until Start() is called.
|
|
OutsideOfStyleElement,
|
|
// In an idle state during the stylesheet scanning, either at the
|
|
// beginning or after parsing a rule.
|
|
Idle,
|
|
// We've seen a '/' character, but not the '*' yet, so we don't know if
|
|
// it's a comment.
|
|
MaybeAtCommentStart,
|
|
// We're inside a comment.
|
|
AtComment,
|
|
// We've seen a '*' while we're in a comment, but we don't now yet whether
|
|
// '/' comes afterwards (thus ending the comment).
|
|
MaybeAtCommentEnd,
|
|
// We're parsing the '@' rule name.
|
|
AtRuleName,
|
|
// We're parsing the '@' rule value.
|
|
AtRuleValue,
|
|
// We're parsing the '@' rule value and we've seen the delimiter (quote or
|
|
// url() function) that encloses the url.
|
|
AtRuleValueDelimited,
|
|
// We've seen the url, but haven't seen the ';' finishing the rule yet.
|
|
AfterRuleValue,
|
|
// We've seen anything that is not an @import or a @charset rule, and thus
|
|
// further @import / @charset should not be parsed.
|
|
Done,
|
|
};
|
|
|
|
void EmitUrl();
|
|
[[nodiscard]] State Scan(char16_t aChar);
|
|
|
|
static constexpr const uint32_t kMaxRuleNameLength = 7; // (charset, import)
|
|
|
|
State mState = State::OutsideOfStyleElement;
|
|
nsAutoStringN<kMaxRuleNameLength> mRuleName;
|
|
nsAutoStringN<128> mRuleValue;
|
|
nsTArray<nsString> mUrlsFound;
|
|
|
|
// This is conceptually part of the AtRuleValue* / AfterRuleValue states,
|
|
// and serves to differentiate between @import (where we actually care about
|
|
// the value) and @charset (where we don't). It's just more convenient this
|
|
// way than having separate states for them.
|
|
bool mInImportRule = false;
|
|
// If we're in the AtRuleValueDelimited state, what is the closing character
|
|
// that will end the value. This is either a parenthesis (for unquoted
|
|
// urls), or a quote, either single or double.
|
|
char16_t mUrlValueDelimiterClosingChar = 0;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif
|