#include "syntaxhighlighter.h"

SyntaxHighlighter::SyntaxHighlighter(QTextDocument *parent)
    : QSyntaxHighlighter(parent)
{
    HighlightingRule rule;

    keywordFormat.setForeground(Qt::darkBlue);
    keywordFormat.setFontWeight(QFont::Bold);
    QStringList keywordPatterns;

    keywordPatterns << "\\bCREATE\\b" << "\\bMOVE\\b" << "\\bDIE\\b" << "\\bTRANS\\b" << "\\bRTRANS\\b" << "\\bTURN\\b"
                    << "\\bJUMP\\b" << "\\bAJUMP\\b" << "\\bBJUMP\\b"
                    << "\\bSCAN\\b" << "\\bFARSCAN\\b"
                    << "\\bSET\\b" << "\\bADD\\b" << "\\bSUB\\b" << "\\bMUL\\b" << "\\bDIV\\b" << "\\bMOD\\b" << "\\bMIN\\b" << "\\bMAX\\b" << "\\bRANDOM\\b"
                    << "\\bIF\\b" << "\\bIFN\\b" << "\\bIFG\\b" << "\\bIFL\\b" << "\\bIFGE\\b" << "\\bIFLE\\b"
                    << "\\bINIT\\b" << "\\bBREAK\\b" << "\\bRESUME\\b" << "\\bSEIZE\\b" << "\\bSLEEP\\b" << "\\bQUIT\\b"
                       ;

    foreach (const QString &pattern, keywordPatterns) {
        rule.pattern = QRegExp(pattern);
        rule.pattern.setCaseSensitivity(Qt::CaseInsensitive);
        rule.format = keywordFormat;
        highlightingRules.append(rule);
    }

    bankFormat.setFontWeight(QFont::Bold);
    bankFormat.setForeground(Qt::white);
    bankFormat.setBackground(Qt::darkGray);
    rule.pattern = QRegExp("\\s*BANK.*");
    rule.pattern.setCaseSensitivity(Qt::CaseInsensitive);
    rule.format = bankFormat;
    highlightingRules.append(rule);

    singleLineCommentFormat.setForeground(Qt::darkGreen);
    rule.pattern = QRegExp("//[^\n]*");
    rule.format = singleLineCommentFormat;
    highlightingRules.append(rule);

    multiLineCommentFormat.setForeground(Qt::darkGreen);

    commentStartExpression = QRegExp("/\\*");
    commentEndExpression = QRegExp("\\*/");
}

void SyntaxHighlighter::highlightBlock(const QString &text)
{
    foreach (const HighlightingRule &rule, highlightingRules) {
        QRegExp expression(rule.pattern);
        int index = expression.indexIn(text);
        while (index >= 0) {
            int length = expression.matchedLength();
            setFormat(index, length, rule.format);
            index = expression.indexIn(text, index + length);
        }
    }

    setCurrentBlockState(0);

    int startIndex = 0;
    if (previousBlockState() != 1)
        startIndex = commentStartExpression.indexIn(text);

    while (startIndex >= 0) {
        int endIndex = commentEndExpression.indexIn(text, startIndex);
        int commentLength;
        if (endIndex == -1) {
            setCurrentBlockState(1);
            commentLength = text.length() - startIndex;
        } else {
            commentLength = endIndex - startIndex
                            + commentEndExpression.matchedLength();
        }
        setFormat(startIndex, commentLength, multiLineCommentFormat);
        startIndex = commentStartExpression.indexIn(text, startIndex + commentLength);
    }
}