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|
/******************************************************************
* LexTxt2tags.cxx
*
* A simple Txt2tags lexer for scintilla.
*
*
* Adapted by Eric Forgeot
* Based on the LexMarkdown.cxx by Jon Strait - jstrait@moonloop.net
*
* What could be improved:
* - Verbatim lines could be like for raw lines : when there is no space between the ``` and the following text, the first letter should be colored so the user would understand there must be a space for a valid tag.
* - marks such as bold, italic, strikeout, underline should begin to be highlighted only when they are closed and valid.
* - verbatim and raw area should be highlighted too.
*
* The License.txt file describes the conditions under which this
* software may be distributed.
*
*****************************************************************/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
using namespace Scintilla;
static inline bool IsNewline(const int ch) {
return (ch == '\n' || ch == '\r');
}
// True if can follow ch down to the end with possibly trailing whitespace
static bool FollowToLineEnd(const int ch, const int state, const Sci_PositionU endPos, StyleContext &sc) {
Sci_PositionU i = 0;
while (sc.GetRelative(++i) == ch)
;
// Skip over whitespace
while (IsASpaceOrTab(sc.GetRelative(i)) && sc.currentPos + i < endPos)
++i;
if (IsNewline(sc.GetRelative(i)) || sc.currentPos + i == endPos) {
sc.Forward(i);
sc.ChangeState(state);
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
return true;
}
else return false;
}
// Does the previous line have more than spaces and tabs?
static bool HasPrevLineContent(StyleContext &sc) {
Sci_Position i = 0;
// Go back to the previous newline
while ((--i + sc.currentPos) && !IsNewline(sc.GetRelative(i)))
;
while (--i + sc.currentPos) {
if (IsNewline(sc.GetRelative(i)))
break;
if (!IsASpaceOrTab(sc.GetRelative(i)))
return true;
}
return false;
}
// Separator line
static bool IsValidHrule(const Sci_PositionU endPos, StyleContext &sc) {
int count = 1;
Sci_PositionU i = 0;
for (;;) {
++i;
int c = sc.GetRelative(i);
if (c == sc.ch)
++count;
// hit a terminating character
else if (!IsASpaceOrTab(c) || sc.currentPos + i == endPos) {
// Are we a valid HRULE
if ((IsNewline(c) || sc.currentPos + i == endPos) &&
count >= 20 && !HasPrevLineContent(sc)) {
sc.SetState(SCE_TXT2TAGS_HRULE);
sc.Forward(i);
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
return true;
}
else {
sc.SetState(SCE_TXT2TAGS_DEFAULT);
return false;
}
}
}
}
static void ColorizeTxt2tagsDoc(Sci_PositionU startPos, Sci_Position length, int initStyle,
WordList **, Accessor &styler) {
Sci_PositionU endPos = startPos + length;
int precharCount = 0;
// Don't advance on a new loop iteration and retry at the same position.
// Useful in the corner case of having to start at the beginning file position
// in the default state.
bool freezeCursor = false;
StyleContext sc(startPos, length, initStyle, styler);
while (sc.More()) {
// Skip past escaped characters
if (sc.ch == '\\') {
sc.Forward();
continue;
}
// A blockquotes resets the line semantics
if (sc.state == SCE_TXT2TAGS_BLOCKQUOTE){
sc.Forward(2);
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
}
// An option colors the whole line
if (sc.state == SCE_TXT2TAGS_OPTION){
FollowToLineEnd('%', SCE_TXT2TAGS_OPTION, endPos, sc);
}
if (sc.state == SCE_TXT2TAGS_POSTPROC){
FollowToLineEnd('%', SCE_TXT2TAGS_POSTPROC, endPos, sc);
}
if (sc.state == SCE_TXT2TAGS_PREPROC){
FollowToLineEnd('%', SCE_TXT2TAGS_PREPROC, endPos, sc);
}
// A comment colors the whole line
if (sc.state == SCE_TXT2TAGS_COMMENT){
FollowToLineEnd('%', SCE_TXT2TAGS_COMMENT, endPos, sc);
}
// Conditional state-based actions
if (sc.state == SCE_TXT2TAGS_CODE2) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.Match("``") && sc.GetRelative(-2) != ' ') {
sc.Forward(2);
sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
}
// Table
else if (sc.state == SCE_TXT2TAGS_CODE) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.ch == '|' && sc.chPrev != ' ')
sc.ForwardSetState(SCE_TXT2TAGS_DEFAULT);
}
// Strong
else if (sc.state == SCE_TXT2TAGS_STRONG1) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.Match("**") && sc.chPrev != ' ') {
sc.Forward(2);
sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
}
// Emphasis
else if (sc.state == SCE_TXT2TAGS_EM1) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.Match("//") && sc.chPrev != ' ') {
sc.Forward(2);
sc.ForwardSetState(SCE_TXT2TAGS_DEFAULT);
}
}
// Underline
else if (sc.state == SCE_TXT2TAGS_EM2) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.Match("__") && sc.chPrev != ' ') {
sc.Forward(2);
sc.ForwardSetState(SCE_TXT2TAGS_DEFAULT);
}
}
// codeblock
else if (sc.state == SCE_TXT2TAGS_CODEBK) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.atLineStart && sc.Match("```")) {
Sci_Position i = 1;
while (!IsNewline(sc.GetRelative(i)) && sc.currentPos + i < endPos)
i++;
sc.Forward(i);
sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
}
// strikeout
else if (sc.state == SCE_TXT2TAGS_STRIKEOUT) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
if (sc.Match("--") && sc.chPrev != ' ') {
sc.Forward(2);
sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
}
// Headers
else if (sc.state == SCE_TXT2TAGS_LINE_BEGIN) {
if (sc.Match("======"))
{
sc.SetState(SCE_TXT2TAGS_HEADER6);
sc.Forward();
}
else if (sc.Match("====="))
{
sc.SetState(SCE_TXT2TAGS_HEADER5);
sc.Forward();
}
else if (sc.Match("===="))
{
sc.SetState(SCE_TXT2TAGS_HEADER4);
sc.Forward();
}
else if (sc.Match("==="))
{
sc.SetState(SCE_TXT2TAGS_HEADER3);
sc.Forward();
}
//SetStateAndZoom(SCE_TXT2TAGS_HEADER3, 3, '=', sc);
else if (sc.Match("==")) {
sc.SetState(SCE_TXT2TAGS_HEADER2);
sc.Forward();
}
//SetStateAndZoom(SCE_TXT2TAGS_HEADER2, 2, '=', sc);
else if (sc.Match("=")) {
// Catch the special case of an unordered list
if (sc.chNext == '.' && IsASpaceOrTab(sc.GetRelative(2))) {
precharCount = 0;
sc.SetState(SCE_TXT2TAGS_PRECHAR);
}
else
{
sc.SetState(SCE_TXT2TAGS_HEADER1);
sc.Forward();
}
//SetStateAndZoom(SCE_TXT2TAGS_HEADER1, 1, '=', sc);
}
// Numbered title
else if (sc.Match("++++++"))
{
sc.SetState(SCE_TXT2TAGS_HEADER6);
sc.Forward();
}
else if (sc.Match("+++++"))
{
sc.SetState(SCE_TXT2TAGS_HEADER5);
sc.Forward();
}
else if (sc.Match("++++"))
{
sc.SetState(SCE_TXT2TAGS_HEADER4);
sc.Forward();
}
else if (sc.Match("+++"))
{
sc.SetState(SCE_TXT2TAGS_HEADER3);
sc.Forward();
}
//SetStateAndZoom(SCE_TXT2TAGS_HEADER3, 3, '+', sc);
else if (sc.Match("++")) {
sc.SetState(SCE_TXT2TAGS_HEADER2);
sc.Forward();
}
//SetStateAndZoom(SCE_TXT2TAGS_HEADER2, 2, '+', sc);
else if (sc.Match("+")) {
// Catch the special case of an unordered list
if (sc.chNext == ' ' && IsASpaceOrTab(sc.GetRelative(1))) {
// if (IsNewline(sc.ch)) {
//precharCount = 0;
// sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
//sc.SetState(SCE_TXT2TAGS_PRECHAR);
// }
// else {
// precharCount = 0;
sc.SetState(SCE_TXT2TAGS_OLIST_ITEM);
sc.Forward(2);
sc.SetState(SCE_TXT2TAGS_DEFAULT);
// sc.SetState(SCE_TXT2TAGS_PRECHAR);
// }
}
else
{
sc.SetState(SCE_TXT2TAGS_HEADER1);
sc.Forward();
}
}
// Codeblock
else if (sc.Match("```")) {
if (!HasPrevLineContent(sc))
// if (!FollowToLineEnd(sc))
sc.SetState(SCE_TXT2TAGS_CODEBK);
else
sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
// Preproc
else if (sc.Match("%!preproc")) {
sc.SetState(SCE_TXT2TAGS_PREPROC);
}
// Postproc
else if (sc.Match("%!postproc")) {
sc.SetState(SCE_TXT2TAGS_POSTPROC);
}
// Option
else if (sc.Match("%!")) {
sc.SetState(SCE_TXT2TAGS_OPTION);
}
// Comment
else if (sc.ch == '%') {
sc.SetState(SCE_TXT2TAGS_COMMENT);
}
// list
else if (sc.ch == '-') {
precharCount = 0;
sc.SetState(SCE_TXT2TAGS_PRECHAR);
}
// def list
else if (sc.ch == ':') {
precharCount = 0;
sc.SetState(SCE_TXT2TAGS_OLIST_ITEM);
sc.Forward(1);
sc.SetState(SCE_TXT2TAGS_PRECHAR);
}
else if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
else {
precharCount = 0;
sc.SetState(SCE_TXT2TAGS_PRECHAR);
}
}
// The header lasts until the newline
else if (sc.state == SCE_TXT2TAGS_HEADER1 || sc.state == SCE_TXT2TAGS_HEADER2 ||
sc.state == SCE_TXT2TAGS_HEADER3 || sc.state == SCE_TXT2TAGS_HEADER4 ||
sc.state == SCE_TXT2TAGS_HEADER5 || sc.state == SCE_TXT2TAGS_HEADER6) {
if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
}
// New state only within the initial whitespace
if (sc.state == SCE_TXT2TAGS_PRECHAR) {
// Blockquote
if (sc.Match("\"\"\"") && precharCount < 5){
sc.SetState(SCE_TXT2TAGS_BLOCKQUOTE);
sc.Forward(1);
}
/*
// Begin of code block
else if (!HasPrevLineContent(sc) && (sc.chPrev == '\t' || precharCount >= 4))
sc.SetState(SCE_TXT2TAGS_CODEBK);
*/
// HRule - Total of 20 or more hyphens, asterisks, or underscores
// on a line by themselves
else if ((sc.ch == '-' ) && IsValidHrule(endPos, sc))
;
// Unordered list
else if ((sc.ch == '-') && IsASpaceOrTab(sc.chNext)) {
sc.SetState(SCE_TXT2TAGS_ULIST_ITEM);
sc.ForwardSetState(SCE_TXT2TAGS_DEFAULT);
}
// Ordered list
else if (IsADigit(sc.ch)) {
Sci_Position digitCount = 0;
while (IsADigit(sc.GetRelative(++digitCount)))
;
if (sc.GetRelative(digitCount) == '.' &&
IsASpaceOrTab(sc.GetRelative(digitCount + 1))) {
sc.SetState(SCE_TXT2TAGS_OLIST_ITEM);
sc.Forward(digitCount + 1);
sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
}
// Alternate Ordered list
else if (sc.ch == '+' && sc.chNext == ' ' && IsASpaceOrTab(sc.GetRelative(2))) {
// sc.SetState(SCE_TXT2TAGS_OLIST_ITEM);
// sc.Forward(2);
// sc.SetState(SCE_TXT2TAGS_DEFAULT);
}
else if (sc.ch != ' ' || precharCount > 2)
sc.SetState(SCE_TXT2TAGS_DEFAULT);
else
++precharCount;
}
// New state anywhere in doc
if (sc.state == SCE_TXT2TAGS_DEFAULT) {
// if (sc.atLineStart && sc.ch == '#') {
// sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
// freezeCursor = true;
// }
// Links and Images
if (sc.Match("![") || sc.ch == '[') {
Sci_Position i = 0, j = 0, k = 0;
Sci_Position len = endPos - sc.currentPos;
while (i < len && (sc.GetRelative(++i) != ']' || sc.GetRelative(i - 1) == '\\'))
;
if (sc.GetRelative(i) == ']') {
j = i;
if (sc.GetRelative(++i) == '(') {
while (i < len && (sc.GetRelative(++i) != '(' || sc.GetRelative(i - 1) == '\\'))
;
if (sc.GetRelative(i) == '(')
k = i;
}
else if (sc.GetRelative(i) == '[' || sc.GetRelative(++i) == '[') {
while (i < len && (sc.GetRelative(++i) != ']' || sc.GetRelative(i - 1) == '\\'))
;
if (sc.GetRelative(i) == ']')
k = i;
}
}
// At least a link text
if (j) {
sc.SetState(SCE_TXT2TAGS_LINK);
sc.Forward(j);
// Also has a URL or reference portion
if (k)
sc.Forward(k - j);
sc.ForwardSetState(SCE_TXT2TAGS_DEFAULT);
}
}
// Code - also a special case for alternate inside spacing
if (sc.Match("``") && sc.GetRelative(3) != ' ') {
sc.SetState(SCE_TXT2TAGS_CODE2);
sc.Forward();
}
else if (sc.ch == '|' && sc.GetRelative(3) != ' ') {
sc.SetState(SCE_TXT2TAGS_CODE);
}
// Strong
else if (sc.Match("**") && sc.GetRelative(2) != ' ') {
sc.SetState(SCE_TXT2TAGS_STRONG1);
sc.Forward();
}
// Emphasis
else if (sc.Match("//") && sc.GetRelative(2) != ' ') {
sc.SetState(SCE_TXT2TAGS_EM1);
sc.Forward();
}
else if (sc.Match("__") && sc.GetRelative(2) != ' ') {
sc.SetState(SCE_TXT2TAGS_EM2);
sc.Forward();
}
// Strikeout
else if (sc.Match("--") && sc.GetRelative(2) != ' ') {
sc.SetState(SCE_TXT2TAGS_STRIKEOUT);
sc.Forward();
}
// Beginning of line
else if (IsNewline(sc.ch))
sc.SetState(SCE_TXT2TAGS_LINE_BEGIN);
}
// Advance if not holding back the cursor for this iteration.
if (!freezeCursor)
sc.Forward();
freezeCursor = false;
}
sc.Complete();
}
LexerModule lmTxt2tags(SCLEX_TXT2TAGS, ColorizeTxt2tagsDoc, "txt2tags");
|
