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446 lines
16 KiB
446 lines
16 KiB
3 years ago
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/******************************************************************
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* LexMarkdown.cxx
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*
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* A simple Markdown lexer for scintilla.
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*
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* Includes highlighting for some extra features from the
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* Pandoc implementation; strikeout, using '#.' as a default
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* ordered list item marker, and delimited code blocks.
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*
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* Limitations:
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*
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* Standard indented code blocks are not highlighted at all,
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* as it would conflict with other indentation schemes. Use
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* delimited code blocks for blanket highlighting of an
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* entire code block. Embedded HTML is not highlighted either.
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* Blanket HTML highlighting has issues, because some Markdown
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* implementations allow Markdown markup inside of the HTML. Also,
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* there is a following blank line issue that can't be ignored,
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* explained in the next paragraph. Embedded HTML and code
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* blocks would be better supported with language specific
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* highlighting.
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*
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* The highlighting aims to accurately reflect correct syntax,
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* but a few restrictions are relaxed. Delimited code blocks are
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* highlighted, even if the line following the code block is not blank.
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* Requiring a blank line after a block, breaks the highlighting
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* in certain cases, because of the way Scintilla ends up calling
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* the lexer.
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*
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* Written by Jon Strait - jstrait@moonloop.net
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*
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* The License.txt file describes the conditions under which this
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* software may be distributed.
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*
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*****************************************************************/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <string>
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#include <string_view>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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using namespace Lexilla;
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namespace {
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constexpr bool IsNewline(const int ch) {
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// sc.GetRelative(i) returns '\0' if out of range
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return (ch == '\n' || ch == '\r' || ch == '\0');
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}
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}
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// True if can follow ch down to the end with possibly trailing whitespace
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static bool FollowToLineEnd(const int ch, const int state, const Sci_PositionU endPos, StyleContext &sc) {
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Sci_Position i = 0;
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while (sc.GetRelative(++i) == ch)
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;
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// Skip over whitespace
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while (IsASpaceOrTab(sc.GetRelative(i)) && sc.currentPos + i < endPos)
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++i;
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if (IsNewline(sc.GetRelative(i)) || sc.currentPos + i == endPos) {
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sc.Forward(i);
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sc.ChangeState(state);
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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return true;
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}
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else return false;
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}
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// Set the state on text section from current to length characters,
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// then set the rest until the newline to default, except for any characters matching token
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static void SetStateAndZoom(const int state, const Sci_Position length, const int token, StyleContext &sc) {
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sc.SetState(state);
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sc.Forward(length);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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sc.Forward();
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bool started = false;
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while (sc.More() && !IsNewline(sc.ch)) {
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if (sc.ch == token && !started) {
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sc.SetState(state);
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started = true;
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}
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else if (sc.ch != token) {
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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started = false;
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}
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sc.Forward();
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}
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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}
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// Does the previous line have more than spaces and tabs?
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static bool HasPrevLineContent(StyleContext &sc) {
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Sci_Position i = 0;
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// Go back to the previous newline
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while ((--i + (Sci_Position)sc.currentPos) >= 0 && !IsNewline(sc.GetRelative(i)))
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;
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while ((--i + (Sci_Position)sc.currentPos) >= 0) {
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const int ch = sc.GetRelative(i);
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if (ch == '\n')
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break;
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if (!((ch == '\r' || IsASpaceOrTab(ch))))
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return true;
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}
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return false;
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}
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static bool AtTermStart(StyleContext &sc) {
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return sc.currentPos == 0 || sc.chPrev == 0 || isspacechar(sc.chPrev);
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}
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static bool IsCompleteStyleRegion(StyleContext &sc, const char *token) {
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bool found = false;
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const size_t start = strlen(token);
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Sci_Position i = static_cast<Sci_Position>(start);
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while (!IsNewline(sc.GetRelative(i))) {
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// make sure an empty pair of single-char tokens doesn't match
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// with a longer token: {*}{*} != {**}
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if (sc.GetRelative(i) == *token && sc.GetRelative(i - 1) != *token) {
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found = start > 1U ? sc.GetRelative(i + 1) == token[1] : true;
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break;
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}
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i++;
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}
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return AtTermStart(sc) && found;
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}
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static bool IsValidHrule(const Sci_PositionU endPos, StyleContext &sc) {
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int count = 1;
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Sci_Position i = 0;
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for (;;) {
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++i;
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int c = sc.GetRelative(i);
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if (c == sc.ch)
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++count;
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// hit a terminating character
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else if (!IsASpaceOrTab(c) || sc.currentPos + i == endPos) {
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// Are we a valid HRULE
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if ((IsNewline(c) || sc.currentPos + i == endPos) &&
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count >= 3 && !HasPrevLineContent(sc)) {
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sc.SetState(SCE_MARKDOWN_HRULE);
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sc.Forward(i);
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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return true;
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}
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else {
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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return false;
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}
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}
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}
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}
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static void ColorizeMarkdownDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
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WordList **, Accessor &styler) {
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Sci_PositionU endPos = startPos + length;
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int precharCount = 0;
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bool isLinkNameDetecting = false;
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// Don't advance on a new loop iteration and retry at the same position.
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// Useful in the corner case of having to start at the beginning file position
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// in the default state.
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bool freezeCursor = false;
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StyleContext sc(startPos, static_cast<Sci_PositionU>(length), initStyle, styler);
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while (sc.More()) {
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// Skip past escaped characters
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if (sc.ch == '\\') {
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sc.Forward();
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continue;
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}
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// A blockquotes resets the line semantics
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if (sc.state == SCE_MARKDOWN_BLOCKQUOTE)
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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// Conditional state-based actions
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if (sc.state == SCE_MARKDOWN_CODE2) {
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if (sc.Match("``")) {
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const int closingSpan = (sc.GetRelative(2) == '`') ? 3 : 2;
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sc.Forward(closingSpan);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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}
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else if (sc.state == SCE_MARKDOWN_CODE) {
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if (sc.ch == '`' && sc.chPrev != ' ')
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sc.ForwardSetState(SCE_MARKDOWN_DEFAULT);
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}
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/* De-activated because it gets in the way of other valid indentation
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* schemes, for example multiple paragraphs inside a list item.
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// Code block
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else if (sc.state == SCE_MARKDOWN_CODEBK) {
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bool d = true;
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if (IsNewline(sc.ch)) {
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if (sc.chNext != '\t') {
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for (int c = 1; c < 5; ++c) {
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if (sc.GetRelative(c) != ' ')
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d = false;
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}
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}
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}
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else if (sc.atLineStart) {
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if (sc.ch != '\t' ) {
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for (int i = 0; i < 4; ++i) {
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if (sc.GetRelative(i) != ' ')
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d = false;
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}
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}
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}
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if (!d)
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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}
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*/
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// Strong
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else if (sc.state == SCE_MARKDOWN_STRONG1) {
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if ((sc.Match("**") && sc.chPrev != ' ') || IsNewline(sc.GetRelative(2))) {
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sc.Forward(2);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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}
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else if (sc.state == SCE_MARKDOWN_STRONG2) {
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if ((sc.Match("__") && sc.chPrev != ' ') || IsNewline(sc.GetRelative(2))) {
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sc.Forward(2);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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}
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// Emphasis
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else if (sc.state == SCE_MARKDOWN_EM1) {
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if ((sc.ch == '*' && sc.chPrev != ' ') || IsNewline(sc.chNext))
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sc.ForwardSetState(SCE_MARKDOWN_DEFAULT);
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}
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else if (sc.state == SCE_MARKDOWN_EM2) {
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if ((sc.ch == '_' && sc.chPrev != ' ') || IsNewline(sc.chNext))
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sc.ForwardSetState(SCE_MARKDOWN_DEFAULT);
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}
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else if (sc.state == SCE_MARKDOWN_CODEBK) {
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if (sc.atLineStart && sc.Match("~~~")) {
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Sci_Position i = 1;
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while (!IsNewline(sc.GetRelative(i)) && sc.currentPos + i < endPos)
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i++;
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sc.Forward(i);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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}
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else if (sc.state == SCE_MARKDOWN_STRIKEOUT) {
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if ((sc.Match("~~") && sc.chPrev != ' ') || IsNewline(sc.GetRelative(2))) {
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sc.Forward(2);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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}
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else if (sc.state == SCE_MARKDOWN_LINE_BEGIN) {
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// Header
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if (sc.Match("######"))
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SetStateAndZoom(SCE_MARKDOWN_HEADER6, 6, '#', sc);
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else if (sc.Match("#####"))
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SetStateAndZoom(SCE_MARKDOWN_HEADER5, 5, '#', sc);
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else if (sc.Match("####"))
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SetStateAndZoom(SCE_MARKDOWN_HEADER4, 4, '#', sc);
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else if (sc.Match("###"))
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SetStateAndZoom(SCE_MARKDOWN_HEADER3, 3, '#', sc);
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else if (sc.Match("##"))
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SetStateAndZoom(SCE_MARKDOWN_HEADER2, 2, '#', sc);
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else if (sc.Match("#")) {
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// Catch the special case of an unordered list
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if (sc.chNext == '.' && IsASpaceOrTab(sc.GetRelative(2))) {
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precharCount = 0;
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sc.SetState(SCE_MARKDOWN_PRECHAR);
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}
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else
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SetStateAndZoom(SCE_MARKDOWN_HEADER1, 1, '#', sc);
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}
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// Code block
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else if (sc.Match("~~~")) {
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if (!HasPrevLineContent(sc))
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sc.SetState(SCE_MARKDOWN_CODEBK);
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else
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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else if (sc.ch == '=') {
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if (HasPrevLineContent(sc) && FollowToLineEnd('=', SCE_MARKDOWN_HEADER1, endPos, sc))
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;
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else
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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else if (sc.ch == '-') {
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if (HasPrevLineContent(sc) && FollowToLineEnd('-', SCE_MARKDOWN_HEADER2, endPos, sc))
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;
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else {
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precharCount = 0;
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sc.SetState(SCE_MARKDOWN_PRECHAR);
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}
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}
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else if (IsNewline(sc.ch))
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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else {
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precharCount = 0;
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sc.SetState(SCE_MARKDOWN_PRECHAR);
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}
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}
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// The header lasts until the newline
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else if (sc.state == SCE_MARKDOWN_HEADER1 || sc.state == SCE_MARKDOWN_HEADER2 ||
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sc.state == SCE_MARKDOWN_HEADER3 || sc.state == SCE_MARKDOWN_HEADER4 ||
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sc.state == SCE_MARKDOWN_HEADER5 || sc.state == SCE_MARKDOWN_HEADER6) {
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if (IsNewline(sc.ch))
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sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
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}
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// New state only within the initial whitespace
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if (sc.state == SCE_MARKDOWN_PRECHAR) {
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// Blockquote
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if (sc.ch == '>' && precharCount < 5)
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sc.SetState(SCE_MARKDOWN_BLOCKQUOTE);
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/*
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// Begin of code block
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else if (!HasPrevLineContent(sc) && (sc.chPrev == '\t' || precharCount >= 4))
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sc.SetState(SCE_MARKDOWN_CODEBK);
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*/
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// HRule - Total of three or more hyphens, asterisks, or underscores
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// on a line by themselves
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else if ((sc.ch == '-' || sc.ch == '*' || sc.ch == '_') && IsValidHrule(endPos, sc))
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;
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// Unordered list
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else if ((sc.ch == '-' || sc.ch == '*' || sc.ch == '+') && IsASpaceOrTab(sc.chNext)) {
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sc.SetState(SCE_MARKDOWN_ULIST_ITEM);
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sc.ForwardSetState(SCE_MARKDOWN_DEFAULT);
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}
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// Ordered list
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else if (IsADigit(sc.ch)) {
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int digitCount = 0;
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while (IsADigit(sc.GetRelative(++digitCount)))
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;
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if (sc.GetRelative(digitCount) == '.' &&
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IsASpaceOrTab(sc.GetRelative(digitCount + 1))) {
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sc.SetState(SCE_MARKDOWN_OLIST_ITEM);
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sc.Forward(digitCount + 1);
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sc.SetState(SCE_MARKDOWN_DEFAULT);
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}
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}
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// Alternate Ordered list
|
||
|
|
else if (sc.ch == '#' && sc.chNext == '.' && IsASpaceOrTab(sc.GetRelative(2))) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_OLIST_ITEM);
|
||
|
|
sc.Forward(2);
|
||
|
|
sc.SetState(SCE_MARKDOWN_DEFAULT);
|
||
|
|
}
|
||
|
|
else if (sc.ch != ' ' || precharCount > 2)
|
||
|
|
sc.SetState(SCE_MARKDOWN_DEFAULT);
|
||
|
|
else
|
||
|
|
++precharCount;
|
||
|
|
}
|
||
|
|
|
||
|
|
// Any link
|
||
|
|
if (sc.state == SCE_MARKDOWN_LINK) {
|
||
|
|
if (sc.Match("](") && sc.GetRelative(-1) != '\\') {
|
||
|
|
sc.Forward(2);
|
||
|
|
isLinkNameDetecting = true;
|
||
|
|
}
|
||
|
|
else if (sc.Match("]:") && sc.GetRelative(-1) != '\\') {
|
||
|
|
sc.Forward(2);
|
||
|
|
sc.SetState(SCE_MARKDOWN_DEFAULT);
|
||
|
|
}
|
||
|
|
else if (!isLinkNameDetecting && sc.ch == ']' && sc.GetRelative(-1) != '\\') {
|
||
|
|
sc.Forward();
|
||
|
|
sc.SetState(SCE_MARKDOWN_DEFAULT);
|
||
|
|
}
|
||
|
|
else if (isLinkNameDetecting && sc.ch == ')' && sc.GetRelative(-1) != '\\') {
|
||
|
|
sc.Forward();
|
||
|
|
sc.SetState(SCE_MARKDOWN_DEFAULT);
|
||
|
|
isLinkNameDetecting = false;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// New state anywhere in doc
|
||
|
|
if (sc.state == SCE_MARKDOWN_DEFAULT) {
|
||
|
|
if (sc.atLineStart && sc.ch == '#') {
|
||
|
|
sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
|
||
|
|
freezeCursor = true;
|
||
|
|
}
|
||
|
|
// Links and Images
|
||
|
|
if (sc.Match("![")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_LINK);
|
||
|
|
sc.Forward(1);
|
||
|
|
}
|
||
|
|
else if (sc.ch == '[' && sc.GetRelative(-1) != '\\') {
|
||
|
|
sc.SetState(SCE_MARKDOWN_LINK);
|
||
|
|
}
|
||
|
|
// Code - also a special case for alternate inside spacing
|
||
|
|
else if (sc.Match("``") && sc.GetRelative(3) != ' ' && AtTermStart(sc)) {
|
||
|
|
const int openingSpan = (sc.GetRelative(2) == '`') ? 2 : 1;
|
||
|
|
sc.SetState(SCE_MARKDOWN_CODE2);
|
||
|
|
sc.Forward(openingSpan);
|
||
|
|
}
|
||
|
|
else if (sc.ch == '`' && sc.chNext != ' ' && IsCompleteStyleRegion(sc, "`")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_CODE);
|
||
|
|
}
|
||
|
|
// Strong
|
||
|
|
else if (sc.Match("**") && sc.GetRelative(2) != ' ' && IsCompleteStyleRegion(sc, "**")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_STRONG1);
|
||
|
|
sc.Forward();
|
||
|
|
}
|
||
|
|
else if (sc.Match("__") && sc.GetRelative(2) != ' ' && IsCompleteStyleRegion(sc, "__")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_STRONG2);
|
||
|
|
sc.Forward();
|
||
|
|
}
|
||
|
|
// Emphasis
|
||
|
|
else if (sc.ch == '*' && sc.chNext != ' ' && IsCompleteStyleRegion(sc, "*")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_EM1);
|
||
|
|
} else if (sc.ch == '_' && sc.chNext != ' ' && IsCompleteStyleRegion(sc, "_")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_EM2);
|
||
|
|
}
|
||
|
|
// Strikeout
|
||
|
|
else if (sc.Match("~~") && !(sc.GetRelative(2) == '~' || sc.GetRelative(2) == ' ') &&
|
||
|
|
IsCompleteStyleRegion(sc, "~~")) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_STRIKEOUT);
|
||
|
|
sc.Forward();
|
||
|
|
}
|
||
|
|
// Beginning of line
|
||
|
|
else if (IsNewline(sc.ch)) {
|
||
|
|
sc.SetState(SCE_MARKDOWN_LINE_BEGIN);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// Advance if not holding back the cursor for this iteration.
|
||
|
|
if (!freezeCursor)
|
||
|
|
sc.Forward();
|
||
|
|
freezeCursor = false;
|
||
|
|
}
|
||
|
|
sc.Complete();
|
||
|
|
}
|
||
|
|
|
||
|
|
LexerModule lmMarkdown(SCLEX_MARKDOWN, ColorizeMarkdownDoc, "markdown");
|