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//===========================================
// Lumina-DE source code
// Copyright (c) 2015, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
#ifndef _LUMINA_SYNTAX_HIGHLIGHER_CPP_H
#define _LUMINA_SYNTAX_HIGHLIGHER_CPP_H
#include <QSyntaxHighlighter>
#include <QTextDocument>
#include <QTextCharFormat>
#include <QString>
#include <QSettings>
#include <QDebug>
#include <QDateTime>
#include <QJsonObject>
#include <QPlainTextEdit>
//Simple syntax rules
struct SyntaxRule{
QRegExp pattern; //single-line rule
QRegExp startPattern, endPattern; //multi-line rules
QTextCharFormat format;
};
class SyntaxFile{
private:
QJsonObject metaObj;
QJsonObject formatObj;
QColor colorFromOption(QString opt, QSettings *settings);
public:
QVector<SyntaxRule> rules;
QDateTime lastLoaded;
QString fileLoaded;
SyntaxFile(){}
QString name();
int char_limit();
bool highlight_excess_whitespace();
int tab_length();
void SetupDocument(QPlainTextEdit *editor);
bool supportsFile(QString file); //does this syntax set support the file?
//Main Loading routine (run this before other functions)
bool LoadFile(QString file, QSettings *settings);
//Main function for finding/loading all syntax files
static QList<SyntaxFile> availableFiles(QSettings *settings);
};
class Custom_Syntax : public QSyntaxHighlighter{
Q_OBJECT
private:
QSettings *settings;
SyntaxFile syntax;
public:
Custom_Syntax(QSettings *set, QTextDocument *parent = 0) : QSyntaxHighlighter(parent){
settings = set;
}
~Custom_Syntax(){}
static QStringList availableRules(QSettings *settings);
static QStringList knownColors();
static void SetupDefaultColors(QSettings *settings);
static QString ruleForFile(QString filename, QSettings *settings);
void loadRules(QString type);
void loadRules(SyntaxFile sfile);
void reloadRules(){
loadRules( syntax.name() );
}
protected:
void highlightBlock(const QString &text){
//qDebug() << "Highlight Block:" << text;
//Now look for any multi-line patterns (starting/continuing/ending)
int start = 0;
int splitactive = previousBlockState();
if(splitactive>syntax.rules.length()-1){ splitactive = -1; } //just in case
while(start>=0 && start<=text.length()-1){
//qDebug() << "split check:" << start << splitactive;
if(splitactive>=0){
//Find the end of the current rule
int end = syntax.rules[splitactive].endPattern.indexIn(text, start);
if(end==-1){
//qDebug() << "Highlight to end of line:" << text << start;
//rule did not finish - apply to all
if(start>0){ setFormat(start-1, text.length()-start+1, syntax.rules[splitactive].format); }
else{ setFormat(start, text.length()-start, syntax.rules[splitactive].format); }
break; //stop looking for more multi-line patterns
}else{
//Found end point within the same line
//qDebug() << "Highlight to particular point:" << text << start << end;
int len = end-start+syntax.rules[splitactive].endPattern.matchedLength();
if(start>0){ start--; len++; } //need to include the first character as well
setFormat(start, len , syntax.rules[splitactive].format);
start+=len; //move pointer to the end of handled range
splitactive = -1; //done with this rule
}
} //end check for end match
//Look for the start of any new split rules
//qDebug() << "Loop over multi-line rules";
for(int i=0; i<syntax.rules.length() && splitactive<0; i++){
//qDebug() << "Check Rule:" << i << syntax.rules[i].startPattern << syntax.rules[i].endPattern;
if(syntax.rules[i].startPattern.isEmpty()){ continue; }
//qDebug() << "Look for start of split rule:" << syntax.rules[i].startPattern << splitactive;
int newstart = syntax.rules[i].startPattern.indexIn(text,start);
if(newstart>=start){
//qDebug() << "Got Start of split rule:" << start << newstart << text;
splitactive = i;
start = newstart+1;
if(start>=text.length()-1){
//qDebug() << "Special case: start now greater than line length";
//Need to apply highlighting to this section too - start matches the end of the line
setFormat(start-1, text.length()-start+1, syntax.rules[splitactive].format);
}
}
}
if(splitactive<0){ break; } //no other rules found - go ahead and exit the loop
} //end scan over line length and multi-line formats
setCurrentBlockState(splitactive);
//Do all the single-line patterns
for(int i=0; i<syntax.rules.length(); i++){
if(syntax.rules[i].pattern.isEmpty()){ continue; } //not a single-line rule
QRegExp patt(syntax.rules[i].pattern); //need a copy of the rule's pattern (will be changing it below)
int index = patt.indexIn(text);
if(splitactive>=0 || index<start){ continue; } //skip this one - falls within a multi-line pattern above
while(index>=0){
int len = patt.matchedLength();
if(format(index)==currentBlock().charFormat()){ setFormat(index, len, syntax.rules[i].format); } //only apply highlighting if not within a section already
index = patt.indexIn(text, index+len); //go to the next match
}
}//end loop over normal (single-line) patterns
//Now go through and apply any document-wide formatting rules
QTextCharFormat fmt;
fmt.setBackground( QColor( settings->value("colors/bracket-missing").toString() ) );
int max = syntax.char_limit();
if(max >= 0 && ( (text.length()+(text.count("\t")*(syntax.tab_length()-1)) )> max) ){
//Line longer than it should be - highlight the offending characters
//Need to be careful about where tabs show up in the line
int len = 0;
for(int i=0; i<text.length(); i++){
if(text[i]=='\t'){ len += syntax.tab_length(); }
else{ len++; }
if(len>max){ setFormat(i, text.length()-i, fmt); break; }
}
}
if(syntax.highlight_excess_whitespace()){
int last = text.length()-1;
while(last>=0 && (text[last]==' ' || text[last]=='\t' ) ){ last--; }
if(last < text.length()-1){
setFormat(last+1, text.length()-1-last, fmt);
}
}
}
};
#endif
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