зеркало из https://github.com/mozilla/gecko-dev.git
432 строки
14 KiB
C++
432 строки
14 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsMathMLOperators.h"
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#include "nsCOMPtr.h"
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#include "nsTHashMap.h"
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#include "nsHashKeys.h"
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#include "nsNetUtil.h"
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#include "nsTArray.h"
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#include "mozilla/intl/UnicodeProperties.h"
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#include "nsIPersistentProperties2.h"
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#include "nsISimpleEnumerator.h"
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#include "nsCRT.h"
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// operator dictionary entry
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struct OperatorData {
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OperatorData(void) : mFlags(0), mLeadingSpace(0.0f), mTrailingSpace(0.0f) {}
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// member data
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nsString mStr;
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nsOperatorFlags mFlags;
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float mLeadingSpace; // unit is em
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float mTrailingSpace; // unit is em
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};
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static int32_t gTableRefCount = 0;
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static uint32_t gOperatorCount = 0;
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static OperatorData* gOperatorArray = nullptr;
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static nsTHashMap<nsStringHashKey, OperatorData*>* gOperatorTable = nullptr;
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static bool gGlobalsInitialized = false;
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static const char16_t kDashCh = char16_t('#');
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static const char16_t kColonCh = char16_t(':');
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static uint32_t ToUnicodeCodePoint(const nsString& aOperator) {
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if (aOperator.Length() == 1) {
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return aOperator[0];
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}
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if (aOperator.Length() == 2 &&
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NS_IS_SURROGATE_PAIR(aOperator[0], aOperator[1])) {
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return SURROGATE_TO_UCS4(aOperator[0], aOperator[1]);
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}
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return 0;
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}
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static void SetBooleanProperty(OperatorData* aOperatorData, nsString aName) {
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if (aName.IsEmpty()) return;
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if (aName.EqualsLiteral("stretchy") && (1 == aOperatorData->mStr.Length()))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_STRETCHY;
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else if (aName.EqualsLiteral("fence"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_FENCE;
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else if (aName.EqualsLiteral("accent"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_ACCENT;
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else if (aName.EqualsLiteral("largeop"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_LARGEOP;
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else if (aName.EqualsLiteral("separator"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_SEPARATOR;
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else if (aName.EqualsLiteral("movablelimits"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_MOVABLELIMITS;
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else if (aName.EqualsLiteral("symmetric"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_SYMMETRIC;
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}
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static void SetProperty(OperatorData* aOperatorData, nsString aName,
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nsString aValue) {
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if (aName.IsEmpty() || aValue.IsEmpty()) return;
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if (aName.EqualsLiteral("direction")) {
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if (aValue.EqualsLiteral("vertical"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_DIRECTION_VERTICAL;
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else if (aValue.EqualsLiteral("horizontal"))
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aOperatorData->mFlags |= NS_MATHML_OPERATOR_DIRECTION_HORIZONTAL;
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else
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return; // invalid value
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} else {
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bool isLeadingSpace;
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if (aName.EqualsLiteral("lspace"))
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isLeadingSpace = true;
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else if (aName.EqualsLiteral("rspace"))
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isLeadingSpace = false;
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else
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return; // input is not applicable
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// aValue is assumed to be a digit from 0 to 7
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nsresult error = NS_OK;
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float space = aValue.ToFloat(&error) / 18.0;
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if (NS_FAILED(error)) return;
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if (isLeadingSpace)
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aOperatorData->mLeadingSpace = space;
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else
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aOperatorData->mTrailingSpace = space;
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}
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}
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static bool SetOperator(OperatorData* aOperatorData, nsOperatorFlags aForm,
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const nsCString& aOperator, nsString& aAttributes)
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{
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static const char16_t kNullCh = char16_t('\0');
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// aOperator is in the expanded format \uNNNN\uNNNN ...
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// First compress these Unicode points to the internal nsString format
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int32_t i = 0;
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nsAutoString name, value;
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int32_t len = aOperator.Length();
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char16_t c = aOperator[i++];
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uint32_t state = 0;
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char16_t uchar = 0;
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while (i <= len) {
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if (0 == state) {
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if (c != '\\') return false;
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if (i < len) c = aOperator[i];
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i++;
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if (('u' != c) && ('U' != c)) return false;
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if (i < len) c = aOperator[i];
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i++;
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state++;
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} else {
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if (('0' <= c) && (c <= '9'))
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uchar = (uchar << 4) | (c - '0');
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else if (('a' <= c) && (c <= 'f'))
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uchar = (uchar << 4) | (c - 'a' + 0x0a);
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else if (('A' <= c) && (c <= 'F'))
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uchar = (uchar << 4) | (c - 'A' + 0x0a);
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else
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return false;
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if (i < len) c = aOperator[i];
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i++;
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state++;
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if (5 == state) {
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value.Append(uchar);
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uchar = 0;
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state = 0;
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}
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}
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}
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if (0 != state) return false;
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// Quick return when the caller doesn't care about the attributes and just
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// wants to know if this is a valid operator (this is the case at the first
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// pass of the parsing of the dictionary in InitOperators())
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if (!aForm) return true;
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// Add operator to hash table
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aOperatorData->mFlags |= aForm;
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aOperatorData->mStr.Assign(value);
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value.AppendInt(aForm, 10);
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gOperatorTable->InsertOrUpdate(value, aOperatorData);
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#ifdef DEBUG
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NS_LossyConvertUTF16toASCII str(aAttributes);
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#endif
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// Loop over the space-delimited list of attributes to get the name:value
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// pairs
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aAttributes.Append(kNullCh); // put an extra null at the end
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char16_t* start = aAttributes.BeginWriting();
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char16_t* end = start;
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while ((kNullCh != *start) && (kDashCh != *start)) {
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name.SetLength(0);
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value.SetLength(0);
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// skip leading space, the dash amounts to the end of the line
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while ((kNullCh != *start) && (kDashCh != *start) &&
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nsCRT::IsAsciiSpace(*start)) {
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++start;
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}
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end = start;
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// look for ':'
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while ((kNullCh != *end) && (kDashCh != *end) &&
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!nsCRT::IsAsciiSpace(*end) && (kColonCh != *end)) {
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++end;
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}
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// If ':' is not found, then it's a boolean property
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bool IsBooleanProperty = (kColonCh != *end);
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*end = kNullCh; // end segment here
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// this segment is the name
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if (start < end) {
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name.Assign(start);
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}
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if (IsBooleanProperty) {
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SetBooleanProperty(aOperatorData, name);
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} else {
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start = ++end;
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// look for space or end of line
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while ((kNullCh != *end) && (kDashCh != *end) &&
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!nsCRT::IsAsciiSpace(*end)) {
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++end;
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}
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*end = kNullCh; // end segment here
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if (start < end) {
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// this segment is the value
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value.Assign(start);
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}
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SetProperty(aOperatorData, name, value);
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}
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start = ++end;
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}
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return true;
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}
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static nsresult InitOperators(void) {
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// Load the property file containing the Operator Dictionary
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nsresult rv;
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nsCOMPtr<nsIPersistentProperties> mathfontProp;
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rv = NS_LoadPersistentPropertiesFromURISpec(
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getter_AddRefs(mathfontProp),
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"resource://gre/res/fonts/mathfont.properties"_ns);
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if (NS_FAILED(rv)) return rv;
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// Parse the Operator Dictionary in two passes.
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// The first pass is to count the number of operators; the second pass is to
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// allocate the necessary space for them and to add them in the hash table.
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for (int32_t pass = 1; pass <= 2; pass++) {
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OperatorData dummyData;
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OperatorData* operatorData = &dummyData;
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nsCOMPtr<nsISimpleEnumerator> iterator;
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if (NS_SUCCEEDED(mathfontProp->Enumerate(getter_AddRefs(iterator)))) {
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bool more;
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uint32_t index = 0;
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nsAutoCString name;
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nsAutoString attributes;
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while ((NS_SUCCEEDED(iterator->HasMoreElements(&more))) && more) {
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nsCOMPtr<nsISupports> supports;
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nsCOMPtr<nsIPropertyElement> element;
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if (NS_SUCCEEDED(iterator->GetNext(getter_AddRefs(supports)))) {
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element = do_QueryInterface(supports);
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if (NS_SUCCEEDED(element->GetKey(name)) &&
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NS_SUCCEEDED(element->GetValue(attributes))) {
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// expected key: operator.\uNNNN.{infix,postfix,prefix}
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if ((21 <= name.Length()) && (0 == name.Find("operator.\\u"))) {
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name.Cut(0, 9); // 9 is the length of "operator.";
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int32_t len = name.Length();
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nsOperatorFlags form = 0;
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if (kNotFound != name.RFind(".infix")) {
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form = NS_MATHML_OPERATOR_FORM_INFIX;
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len -= 6; // 6 is the length of ".infix";
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} else if (kNotFound != name.RFind(".postfix")) {
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form = NS_MATHML_OPERATOR_FORM_POSTFIX;
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len -= 8; // 8 is the length of ".postfix";
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} else if (kNotFound != name.RFind(".prefix")) {
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form = NS_MATHML_OPERATOR_FORM_PREFIX;
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len -= 7; // 7 is the length of ".prefix";
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} else
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continue; // input is not applicable
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name.SetLength(len);
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if (2 == pass) { // allocate space and start the storage
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if (!gOperatorArray) {
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if (0 == gOperatorCount) return NS_ERROR_UNEXPECTED;
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gOperatorArray = new OperatorData[gOperatorCount];
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}
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operatorData = &gOperatorArray[index];
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} else {
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form = 0; // to quickly return from SetOperator() at pass 1
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}
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// See if the operator should be retained
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if (SetOperator(operatorData, form, name, attributes)) {
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index++;
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if (1 == pass) gOperatorCount = index;
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}
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}
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}
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}
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}
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}
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}
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return NS_OK;
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}
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static nsresult InitOperatorGlobals() {
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gGlobalsInitialized = true;
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nsresult rv = NS_ERROR_OUT_OF_MEMORY;
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gOperatorTable = new nsTHashMap<nsStringHashKey, OperatorData*>();
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if (gOperatorTable) {
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rv = InitOperators();
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}
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if (NS_FAILED(rv)) nsMathMLOperators::CleanUp();
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return rv;
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}
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void nsMathMLOperators::CleanUp() {
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if (gOperatorArray) {
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delete[] gOperatorArray;
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gOperatorArray = nullptr;
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}
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if (gOperatorTable) {
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delete gOperatorTable;
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gOperatorTable = nullptr;
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}
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}
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void nsMathMLOperators::AddRefTable(void) { gTableRefCount++; }
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void nsMathMLOperators::ReleaseTable(void) {
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if (0 == --gTableRefCount) {
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CleanUp();
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}
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}
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static OperatorData* GetOperatorData(const nsString& aOperator,
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const uint8_t aForm) {
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nsAutoString key(aOperator);
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key.AppendInt(aForm);
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return gOperatorTable->Get(key);
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}
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bool nsMathMLOperators::LookupOperator(const nsString& aOperator,
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const uint8_t aForm,
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nsOperatorFlags* aFlags,
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float* aLeadingSpace,
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float* aTrailingSpace) {
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NS_ASSERTION(aFlags && aLeadingSpace && aTrailingSpace, "bad usage");
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NS_ASSERTION(aForm > 0 && aForm < 4, "*** invalid call ***");
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// Operator strings must be of length 1 or 2 in UTF-16.
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// https://w3c.github.io/mathml-core/#dfn-algorithm-to-determine-the-category-of-an-operator
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if (aOperator.IsEmpty() || aOperator.Length() > 2) {
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return false;
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}
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if (aOperator.Length() == 2) {
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// Try and handle Arabic operators.
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// https://w3c.github.io/mathml-core/#dfn-algorithm-to-determine-the-category-of-an-operator
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if (auto codePoint = ToUnicodeCodePoint(aOperator)) {
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if (aForm == NS_MATHML_OPERATOR_FORM_POSTFIX &&
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(codePoint == 0x1EEF0 || codePoint == 0x1EEF1)) {
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// Use category I.
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// https://w3c.github.io/mathml-core/#operator-dictionary-categories-values
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*aFlags = NS_MATHML_OPERATOR_FORM_POSTFIX |
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NS_MATHML_OPERATOR_STRETCHY |
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NS_MATHML_OPERATOR_DIRECTION_HORIZONTAL;
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*aLeadingSpace = 0;
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*aTrailingSpace = 0;
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return true;
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}
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return false;
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}
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// Ignore the combining "negation" suffix for 2-character strings.
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// https://w3c.github.io/mathml-core/#dfn-algorithm-to-determine-the-category-of-an-operator
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if (aOperator[1] == 0x0338 || aOperator[1] == 0x20D2) {
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nsAutoString newOperator;
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newOperator.Append(aOperator[0]);
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return LookupOperator(newOperator, aForm, aFlags, aLeadingSpace,
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aTrailingSpace);
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}
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}
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if (!gGlobalsInitialized) {
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InitOperatorGlobals();
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}
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if (gOperatorTable) {
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if (OperatorData* data = GetOperatorData(aOperator, aForm)) {
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NS_ASSERTION(data->mStr.Equals(aOperator), "bad setup");
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*aFlags = data->mFlags;
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*aLeadingSpace = data->mLeadingSpace;
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*aTrailingSpace = data->mTrailingSpace;
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return true;
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}
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}
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return false;
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}
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bool nsMathMLOperators::LookupOperatorWithFallback(const nsString& aOperator,
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const uint8_t aForm,
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nsOperatorFlags* aFlags,
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float* aLeadingSpace,
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float* aTrailingSpace) {
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if (LookupOperator(aOperator, aForm, aFlags, aLeadingSpace, aTrailingSpace)) {
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return true;
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}
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for (const auto& form :
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{NS_MATHML_OPERATOR_FORM_INFIX, NS_MATHML_OPERATOR_FORM_POSTFIX,
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NS_MATHML_OPERATOR_FORM_PREFIX}) {
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if (form == aForm) {
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// This form was tried above, skip it.
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continue;
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}
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if (LookupOperator(aOperator, form, aFlags, aLeadingSpace,
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aTrailingSpace)) {
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return true;
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}
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}
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return false;
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}
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/* static */
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bool nsMathMLOperators::IsMirrorableOperator(const nsString& aOperator) {
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if (auto codePoint = ToUnicodeCodePoint(aOperator)) {
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return mozilla::intl::UnicodeProperties::IsMirrored(codePoint);
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}
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return false;
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}
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/* static */
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bool nsMathMLOperators::IsIntegralOperator(const nsString& aOperator) {
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if (auto codePoint = ToUnicodeCodePoint(aOperator)) {
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return (0x222B <= codePoint && codePoint <= 0x2233) ||
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(0x2A0B <= codePoint && codePoint <= 0x2A1C);
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}
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return false;
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}
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/* static */
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nsStretchDirection nsMathMLOperators::GetStretchyDirection(
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const nsString& aOperator) {
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// Search any entry for that operator and return the corresponding direction.
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// It is assumed that all the forms have same direction.
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for (const auto& form :
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{NS_MATHML_OPERATOR_FORM_INFIX, NS_MATHML_OPERATOR_FORM_POSTFIX,
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NS_MATHML_OPERATOR_FORM_PREFIX}) {
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nsOperatorFlags flags;
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float dummy;
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if (nsMathMLOperators::LookupOperator(aOperator, form, &flags, &dummy,
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&dummy)) {
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if (NS_MATHML_OPERATOR_IS_DIRECTION_VERTICAL(flags)) {
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return NS_STRETCH_DIRECTION_VERTICAL;
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}
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if (NS_MATHML_OPERATOR_IS_DIRECTION_HORIZONTAL(flags)) {
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return NS_STRETCH_DIRECTION_HORIZONTAL;
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}
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}
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}
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return NS_STRETCH_DIRECTION_UNSUPPORTED;
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}
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