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-rw-r--r--editor/libeditor/InternetCiter.cpp293
1 files changed, 293 insertions, 0 deletions
diff --git a/editor/libeditor/InternetCiter.cpp b/editor/libeditor/InternetCiter.cpp
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+++ b/editor/libeditor/InternetCiter.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "InternetCiter.h"
+
+#include "mozilla/Casting.h"
+#include "mozilla/intl/Segmenter.h"
+#include "HTMLEditUtils.h"
+#include "nsAString.h"
+#include "nsCOMPtr.h"
+#include "nsCRT.h"
+#include "nsDebug.h"
+#include "nsDependentSubstring.h"
+#include "nsError.h"
+#include "nsServiceManagerUtils.h"
+#include "nsString.h"
+#include "nsStringIterator.h"
+
+namespace mozilla {
+
+/**
+ * Mail citations using the Internet style: > This is a citation.
+ */
+
+void InternetCiter::GetCiteString(const nsAString& aInString,
+ nsAString& aOutString) {
+ aOutString.Truncate();
+ char16_t uch = HTMLEditUtils::kNewLine;
+
+ // Strip trailing new lines which will otherwise turn up
+ // as ugly quoted empty lines.
+ nsReadingIterator<char16_t> beginIter, endIter;
+ aInString.BeginReading(beginIter);
+ aInString.EndReading(endIter);
+ while (beginIter != endIter && (*endIter == HTMLEditUtils::kCarriageReturn ||
+ *endIter == HTMLEditUtils::kNewLine)) {
+ --endIter;
+ }
+
+ // Loop over the string:
+ while (beginIter != endIter) {
+ if (uch == HTMLEditUtils::kNewLine) {
+ aOutString.Append(HTMLEditUtils::kGreaterThan);
+ // No space between >: this is ">>> " style quoting, for
+ // compatibility with RFC 2646 and format=flowed.
+ if (*beginIter != HTMLEditUtils::kGreaterThan) {
+ aOutString.Append(HTMLEditUtils::kSpace);
+ }
+ }
+
+ uch = *beginIter;
+ ++beginIter;
+
+ aOutString += uch;
+ }
+
+ if (uch != HTMLEditUtils::kNewLine) {
+ aOutString += HTMLEditUtils::kNewLine;
+ }
+}
+
+static void AddCite(nsAString& aOutString, int32_t citeLevel) {
+ for (int32_t i = 0; i < citeLevel; ++i) {
+ aOutString.Append(HTMLEditUtils::kGreaterThan);
+ }
+ if (citeLevel > 0) {
+ aOutString.Append(HTMLEditUtils::kSpace);
+ }
+}
+
+static inline void BreakLine(nsAString& aOutString, uint32_t& outStringCol,
+ uint32_t citeLevel) {
+ aOutString.Append(HTMLEditUtils::kNewLine);
+ if (citeLevel > 0) {
+ AddCite(aOutString, citeLevel);
+ outStringCol = citeLevel + 1;
+ } else {
+ outStringCol = 0;
+ }
+}
+
+static inline bool IsSpace(char16_t c) {
+ return (nsCRT::IsAsciiSpace(c) || (c == HTMLEditUtils::kNewLine) ||
+ (c == HTMLEditUtils::kCarriageReturn) || (c == HTMLEditUtils::kNBSP));
+}
+
+void InternetCiter::Rewrap(const nsAString& aInString, uint32_t aWrapCol,
+ uint32_t aFirstLineOffset, bool aRespectNewlines,
+ nsAString& aOutString) {
+ // There shouldn't be returns in this string, only dom newlines.
+ // Check to make sure:
+#ifdef DEBUG
+ int32_t crPosition = aInString.FindChar(HTMLEditUtils::kCarriageReturn);
+ NS_ASSERTION(crPosition < 0, "Rewrap: CR in string gotten from DOM!\n");
+#endif /* DEBUG */
+
+ aOutString.Truncate();
+
+ // Loop over lines in the input string, rewrapping each one.
+ uint32_t posInString = 0;
+ uint32_t outStringCol = 0;
+ uint32_t citeLevel = 0;
+ const nsPromiseFlatString& tString = PromiseFlatString(aInString);
+ const uint32_t length = tString.Length();
+ while (posInString < length) {
+ // Get the new cite level here since we're at the beginning of a line
+ uint32_t newCiteLevel = 0;
+ while (posInString < length &&
+ tString[posInString] == HTMLEditUtils::kGreaterThan) {
+ ++newCiteLevel;
+ ++posInString;
+ while (posInString < length &&
+ tString[posInString] == HTMLEditUtils::kSpace) {
+ ++posInString;
+ }
+ }
+ if (posInString >= length) {
+ break;
+ }
+
+ // Special case: if this is a blank line, maintain a blank line
+ // (retain the original paragraph breaks)
+ if (tString[posInString] == HTMLEditUtils::kNewLine &&
+ !aOutString.IsEmpty()) {
+ if (aOutString.Last() != HTMLEditUtils::kNewLine) {
+ aOutString.Append(HTMLEditUtils::kNewLine);
+ }
+ AddCite(aOutString, newCiteLevel);
+ aOutString.Append(HTMLEditUtils::kNewLine);
+
+ ++posInString;
+ outStringCol = 0;
+ continue;
+ }
+
+ // If the cite level has changed, then start a new line with the
+ // new cite level (but if we're at the beginning of the string,
+ // don't bother).
+ if (newCiteLevel != citeLevel && posInString > newCiteLevel + 1 &&
+ outStringCol) {
+ BreakLine(aOutString, outStringCol, 0);
+ }
+ citeLevel = newCiteLevel;
+
+ // Prepend the quote level to the out string if appropriate
+ if (!outStringCol) {
+ AddCite(aOutString, citeLevel);
+ outStringCol = citeLevel + (citeLevel ? 1 : 0);
+ }
+ // If it's not a cite, and we're not at the beginning of a line in
+ // the output string, add a space to separate new text from the
+ // previous text.
+ else if (outStringCol > citeLevel) {
+ aOutString.Append(HTMLEditUtils::kSpace);
+ ++outStringCol;
+ }
+
+ // find the next newline -- don't want to go farther than that
+ int32_t nextNewline =
+ tString.FindChar(HTMLEditUtils::kNewLine, posInString);
+ if (nextNewline < 0) {
+ nextNewline = length;
+ }
+
+ // For now, don't wrap unquoted lines at all.
+ // This is because the plaintext edit window has already wrapped them
+ // by the time we get them for rewrap, yet when we call the line
+ // breaker, it will refuse to break backwards, and we'll end up
+ // with a line that's too long and gets displayed as a lone word
+ // on a line by itself. Need special logic to detect this case
+ // and break it ourselves without resorting to the line breaker.
+ if (!citeLevel) {
+ aOutString.Append(
+ Substring(tString, posInString, nextNewline - posInString));
+ outStringCol += nextNewline - posInString;
+ if (nextNewline != (int32_t)length) {
+ aOutString.Append(HTMLEditUtils::kNewLine);
+ outStringCol = 0;
+ }
+ posInString = nextNewline + 1;
+ continue;
+ }
+
+ // Otherwise we have to use the line breaker and loop
+ // over this line of the input string to get all of it:
+ while ((int32_t)posInString < nextNewline) {
+ // Skip over initial spaces:
+ while ((int32_t)posInString < nextNewline &&
+ nsCRT::IsAsciiSpace(tString[posInString])) {
+ ++posInString;
+ }
+
+ // If this is a short line, just append it and continue:
+ if (outStringCol + nextNewline - posInString <=
+ aWrapCol - citeLevel - 1) {
+ // If this short line is the final one in the in string,
+ // then we need to include the final newline, if any:
+ if (nextNewline + 1 == (int32_t)length &&
+ tString[nextNewline - 1] == HTMLEditUtils::kNewLine) {
+ ++nextNewline;
+ }
+ // Trim trailing spaces:
+ int32_t lastRealChar = nextNewline;
+ while ((uint32_t)lastRealChar > posInString &&
+ nsCRT::IsAsciiSpace(tString[lastRealChar - 1])) {
+ --lastRealChar;
+ }
+
+ aOutString +=
+ Substring(tString, posInString, lastRealChar - posInString);
+ outStringCol += lastRealChar - posInString;
+ posInString = nextNewline + 1;
+ continue;
+ }
+
+ int32_t eol = posInString + aWrapCol - citeLevel - outStringCol;
+ // eol is the prospective end of line.
+ // If it's already less than our current position,
+ // then our line is already too long, so break now.
+ if (eol <= (int32_t)posInString) {
+ BreakLine(aOutString, outStringCol, citeLevel);
+ continue; // continue inner loop, with outStringCol now at bol
+ }
+
+ MOZ_ASSERT(eol >= 0 && eol - posInString > 0);
+
+ uint32_t breakPt = 0;
+ Maybe<uint32_t> nextBreakPt;
+ intl::LineBreakIteratorUtf16 lineBreakIter(Span<const char16_t>(
+ tString.get() + posInString, length - posInString));
+ while (true) {
+ nextBreakPt = lineBreakIter.Next();
+ if (!nextBreakPt ||
+ *nextBreakPt > AssertedCast<uint32_t>(eol) - posInString) {
+ break;
+ }
+ breakPt = *nextBreakPt;
+ }
+
+ if (breakPt == 0) {
+ // If we couldn't find a breakpoint within the eol upper bound, and
+ // we're not starting a new line, then end this line and loop around
+ // again:
+ if (outStringCol > citeLevel + 1) {
+ BreakLine(aOutString, outStringCol, citeLevel);
+ continue; // continue inner loop, with outStringCol now at bol
+ }
+
+ MOZ_ASSERT(nextBreakPt.isSome(),
+ "Next() always treats end-of-text as a break");
+ breakPt = *nextBreakPt;
+ }
+
+ // Special case: maybe we should have wrapped last time.
+ // If the first breakpoint here makes the current line too long,
+ // then if we already have text on the current line,
+ // break and loop around again.
+ // If we're at the beginning of the current line, though,
+ // don't force a break since the long word might be a url
+ // and breaking it would make it unclickable on the other end.
+ const int SLOP = 6;
+ if (outStringCol + breakPt > aWrapCol + SLOP &&
+ outStringCol > citeLevel + 1) {
+ BreakLine(aOutString, outStringCol, citeLevel);
+ continue;
+ }
+
+ nsAutoString sub(Substring(tString, posInString, breakPt));
+ // skip newlines or white-space at the end of the string
+ int32_t subend = sub.Length();
+ while (subend > 0 && IsSpace(sub[subend - 1])) {
+ --subend;
+ }
+ sub.Left(sub, subend);
+ aOutString += sub;
+ outStringCol += sub.Length();
+ // Advance past the white-space which caused the wrap:
+ posInString += breakPt;
+ while (posInString < length && IsSpace(tString[posInString])) {
+ ++posInString;
+ }
+
+ // Add a newline and the quote level to the out string
+ if (posInString < length) { // not for the last line, though
+ BreakLine(aOutString, outStringCol, citeLevel);
+ }
+ } // end inner loop within one line of aInString
+ } // end outer loop over lines of aInString
+}
+
+} // namespace mozilla