зеркало из https://github.com/mozilla/gecko-dev.git
306 строки
9.6 KiB
C++
306 строки
9.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsStyleUtil.h"
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#include "nsStyleConsts.h"
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#include "nsIContent.h"
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#include "nsReadableUtils.h"
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#include "nsCSSProps.h"
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#include "nsRuleNode.h"
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using namespace mozilla;
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//------------------------------------------------------------------------------
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// Font Algorithm Code
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//------------------------------------------------------------------------------
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// Compare two language strings
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bool nsStyleUtil::DashMatchCompare(const nsAString& aAttributeValue,
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const nsAString& aSelectorValue,
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const nsStringComparator& aComparator)
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{
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bool result;
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uint32_t selectorLen = aSelectorValue.Length();
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uint32_t attributeLen = aAttributeValue.Length();
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if (selectorLen > attributeLen) {
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result = false;
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}
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else {
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nsAString::const_iterator iter;
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if (selectorLen != attributeLen &&
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*aAttributeValue.BeginReading(iter).advance(selectorLen) !=
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PRUnichar('-')) {
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// to match, the aAttributeValue must have a dash after the end of
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// the aSelectorValue's text (unless the aSelectorValue and the
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// aAttributeValue have the same text)
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result = false;
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}
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else {
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result = StringBeginsWith(aAttributeValue, aSelectorValue, aComparator);
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}
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}
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return result;
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}
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void nsStyleUtil::AppendEscapedCSSString(const nsAString& aString,
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nsAString& aReturn,
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PRUnichar quoteChar)
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{
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NS_PRECONDITION(quoteChar == '\'' || quoteChar == '"',
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"CSS strings must be quoted with ' or \"");
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aReturn.Append(quoteChar);
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const PRUnichar* in = aString.BeginReading();
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const PRUnichar* const end = aString.EndReading();
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for (; in != end; in++) {
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if (*in < 0x20 || (*in >= 0x7F && *in < 0xA0)) {
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// Escape U+0000 through U+001F and U+007F through U+009F numerically.
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aReturn.AppendPrintf("\\%hX ", *in);
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} else {
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if (*in == '"' || *in == '\'' || *in == '\\') {
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// Escape backslash and quote characters symbolically.
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// It's not technically necessary to escape the quote
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// character that isn't being used to delimit the string,
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// but we do it anyway because that makes testing simpler.
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aReturn.Append(PRUnichar('\\'));
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}
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aReturn.Append(*in);
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}
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}
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aReturn.Append(quoteChar);
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}
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/* static */ void
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nsStyleUtil::AppendEscapedCSSIdent(const nsAString& aIdent, nsAString& aReturn)
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{
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// The relevant parts of the CSS grammar are:
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// ident [-]?{nmstart}{nmchar}*
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// nmstart [_a-z]|{nonascii}|{escape}
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// nmchar [_a-z0-9-]|{nonascii}|{escape}
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// nonascii [^\0-\177]
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// escape {unicode}|\\[^\n\r\f0-9a-f]
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// unicode \\[0-9a-f]{1,6}(\r\n|[ \n\r\t\f])?
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// from http://www.w3.org/TR/CSS21/syndata.html#tokenization
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const PRUnichar* in = aIdent.BeginReading();
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const PRUnichar* const end = aIdent.EndReading();
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if (in == end)
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return;
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// A leading dash does not need to be escaped as long as it is not the
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// *only* character in the identifier.
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if (in + 1 != end && *in == '-') {
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aReturn.Append(PRUnichar('-'));
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++in;
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}
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// Escape a digit at the start (including after a dash),
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// numerically. If we didn't escape it numerically, it would get
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// interpreted as a numeric escape for the wrong character.
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// A second dash immediately after a leading dash must also be
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// escaped, but this may be done symbolically.
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if (in != end && (*in == '-' ||
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('0' <= *in && *in <= '9'))) {
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if (*in == '-') {
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aReturn.Append(PRUnichar('\\'));
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aReturn.Append(PRUnichar('-'));
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} else {
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aReturn.AppendPrintf("\\%hX ", *in);
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}
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++in;
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}
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for (; in != end; ++in) {
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PRUnichar ch = *in;
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if (ch < 0x20 || (0x7F <= ch && ch < 0xA0)) {
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// Escape U+0000 through U+001F and U+007F through U+009F numerically.
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aReturn.AppendPrintf("\\%hX ", *in);
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} else {
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// Escape ASCII non-identifier printables as a backslash plus
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// the character.
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if (ch < 0x7F &&
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ch != '_' && ch != '-' &&
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(ch < '0' || '9' < ch) &&
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(ch < 'A' || 'Z' < ch) &&
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(ch < 'a' || 'z' < ch)) {
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aReturn.Append(PRUnichar('\\'));
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}
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aReturn.Append(ch);
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}
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}
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}
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/* static */ void
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nsStyleUtil::AppendBitmaskCSSValue(nsCSSProperty aProperty,
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int32_t aMaskedValue,
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int32_t aFirstMask,
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int32_t aLastMask,
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nsAString& aResult)
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{
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for (int32_t mask = aFirstMask; mask <= aLastMask; mask <<= 1) {
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if (mask & aMaskedValue) {
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AppendASCIItoUTF16(nsCSSProps::LookupPropertyValue(aProperty, mask),
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aResult);
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aMaskedValue &= ~mask;
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if (aMaskedValue) { // more left
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aResult.Append(PRUnichar(' '));
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}
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}
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}
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NS_ABORT_IF_FALSE(aMaskedValue == 0, "unexpected bit remaining in bitfield");
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}
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/* static */ void
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nsStyleUtil::AppendPaintOrderValue(uint8_t aValue,
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nsAString& aResult)
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{
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MOZ_STATIC_ASSERT
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(NS_STYLE_PAINT_ORDER_BITWIDTH * NS_STYLE_PAINT_ORDER_LAST_VALUE <= 8,
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"SVGStyleStruct::mPaintOrder and local variables not big enough");
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if (aValue == NS_STYLE_PAINT_ORDER_NORMAL) {
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aResult.AppendLiteral("normal");
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return;
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}
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// Append the minimal value necessary for the given paint order.
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MOZ_STATIC_ASSERT(NS_STYLE_PAINT_ORDER_LAST_VALUE == 3,
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"paint-order values added; check serialization");
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// The following relies on the default order being the order of the
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// constant values.
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const uint8_t MASK = (1 << NS_STYLE_PAINT_ORDER_BITWIDTH) - 1;
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uint32_t lastPositionToSerialize = 0;
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for (uint32_t position = NS_STYLE_PAINT_ORDER_LAST_VALUE - 1;
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position > 0;
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position--) {
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uint8_t component =
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(aValue >> (position * NS_STYLE_PAINT_ORDER_BITWIDTH)) & MASK;
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uint8_t earlierComponent =
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(aValue >> ((position - 1) * NS_STYLE_PAINT_ORDER_BITWIDTH)) & MASK;
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if (component < earlierComponent) {
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lastPositionToSerialize = position - 1;
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break;
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}
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}
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for (uint32_t position = 0; position <= lastPositionToSerialize; position++) {
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if (position > 0) {
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aResult.AppendLiteral(" ");
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}
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uint8_t component = aValue & MASK;
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switch (component) {
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case NS_STYLE_PAINT_ORDER_FILL:
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aResult.AppendLiteral("fill");
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break;
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case NS_STYLE_PAINT_ORDER_STROKE:
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aResult.AppendLiteral("stroke");
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break;
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case NS_STYLE_PAINT_ORDER_MARKERS:
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aResult.AppendLiteral("markers");
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break;
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default:
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NS_NOTREACHED("unexpected paint-order component value");
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}
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aValue >>= NS_STYLE_PAINT_ORDER_BITWIDTH;
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}
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}
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/* static */ void
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nsStyleUtil::AppendFontFeatureSettings(const nsTArray<gfxFontFeature>& aFeatures,
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nsAString& aResult)
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{
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for (uint32_t i = 0, numFeat = aFeatures.Length(); i < numFeat; i++) {
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const gfxFontFeature& feat = aFeatures[i];
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if (i != 0) {
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aResult.AppendLiteral(", ");
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}
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// output tag
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char tag[7];
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tag[0] = '"';
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tag[1] = (feat.mTag >> 24) & 0xff;
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tag[2] = (feat.mTag >> 16) & 0xff;
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tag[3] = (feat.mTag >> 8) & 0xff;
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tag[4] = feat.mTag & 0xff;
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tag[5] = '"';
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tag[6] = 0;
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aResult.AppendASCII(tag);
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// output value, if necessary
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if (feat.mValue == 0) {
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// 0 ==> off
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aResult.AppendLiteral(" off");
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} else if (feat.mValue > 1) {
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aResult.AppendLiteral(" ");
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aResult.AppendInt(feat.mValue);
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}
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// else, omit value if 1, implied by default
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}
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}
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/* static */ void
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nsStyleUtil::AppendFontFeatureSettings(const nsCSSValue& aSrc,
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nsAString& aResult)
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{
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nsCSSUnit unit = aSrc.GetUnit();
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if (unit == eCSSUnit_Normal) {
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aResult.AppendLiteral("normal");
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return;
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}
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NS_PRECONDITION(unit == eCSSUnit_PairList || unit == eCSSUnit_PairListDep,
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"improper value unit for font-feature-settings:");
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nsTArray<gfxFontFeature> featureSettings;
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nsRuleNode::ComputeFontFeatures(aSrc.GetPairListValue(), featureSettings);
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AppendFontFeatureSettings(featureSettings, aResult);
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}
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/* static */ float
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nsStyleUtil::ColorComponentToFloat(uint8_t aAlpha)
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{
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// Alpha values are expressed as decimals, so we should convert
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// back, using as few decimal places as possible for
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// round-tripping.
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// First try two decimal places:
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float rounded = NS_roundf(float(aAlpha) * 100.0f / 255.0f) / 100.0f;
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if (FloatToColorComponent(rounded) != aAlpha) {
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// Use three decimal places.
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rounded = NS_roundf(float(aAlpha) * 1000.0f / 255.0f) / 1000.0f;
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}
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return rounded;
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}
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/* static */ bool
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nsStyleUtil::IsSignificantChild(nsIContent* aChild, bool aTextIsSignificant,
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bool aWhitespaceIsSignificant)
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{
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NS_ASSERTION(!aWhitespaceIsSignificant || aTextIsSignificant,
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"Nonsensical arguments");
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bool isText = aChild->IsNodeOfType(nsINode::eTEXT);
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if (!isText && !aChild->IsNodeOfType(nsINode::eCOMMENT) &&
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!aChild->IsNodeOfType(nsINode::ePROCESSING_INSTRUCTION)) {
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return true;
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}
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return aTextIsSignificant && isText && aChild->TextLength() != 0 &&
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(aWhitespaceIsSignificant ||
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!aChild->TextIsOnlyWhitespace());
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}
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