Bash Syntax Highlighter

bashhighlighter.cpp

#include "bashhighlighter.h"
#include <QColor>


BashSyntaxHighlighter::BashSyntaxHighlighter(QObject *parent)
    :
      QSyntaxHighlighter(parent)
{
}

BashSyntaxHighlighter::BashSyntaxHighlighter(QTextDocument *parent)
    : QSyntaxHighlighter(parent)
{
    HighlightingRule rule;
    //keywordFormat.setFontWeight(QFont::Bold);
    //FIXME make long ass List
    QStringList commandList;
    commandList << "lsblk" << "lsb_release"<<"lscpu"<< "alias" << "apropos" << "apt-get" << "aptitude" << "aspell" << "awk" << "basename"
                << "bash" <<  "basename" <<        "bc" <<        "bg" <<        "break" <<    "builtin" <<   "bzip2"<<  "cal"
                << "cat" <<     "cd"<<     "cfdisk"<<     "chgrp"<<     "chmod"<<     "chown"<<     "chroot"<<     "chkconfig"
                <<     "cksum"<<     "clear"<< "cmp"<<     "comm"<<  "command"<<    "continue"<<    "cp"<<    "cron"
                    <<    "crontab"<<    "csplit"<<    "curl" <<   "cut" "date"<<    "dc"<<    "dd"<<    "ddrescue"<<    "declare"
                       <<    "df"<<    "diff"<<    "diff3"<<    "dig"<<    "dir"<<       "dircolors"<<    "dirname"<<    "dirs"<<    "dmesg"
                          <<    "du"<<    "echo"<<    "egrep"<<    "eject"<<    "enable"<<    "env"<<    "ethtool"<<    "eval"<<    "exec"
                             <<    "exit"<<    "expect"<<    "expand"<<    "export"<<    "expr"<<    "fdformat"<<    "fdisk"<<    "fg"
                                <<    "fgrep"<<    "file"<<    "find"<<    "fmt"<<    "fold"<<    "format"<<    "free"<<    "fsck"<<    "ftp"
                                   <<    "function"<<    "fuser"<<    "gawk"<<    "getopts"<<    "grep"<<    "groupadd"<<    "groupdel"
                                      <<    "groupmod"<<    "groups"<<    "gzip"<<    "hash"<<    "head"<<    "help"<<    "history"
                                         <<    "hostname"<<    "htop"<<    "iconv"<<    "id"<<    "ifconfig"<<    "ifdown"<<    "ifup"
                                            <<    "import"<<    "install"<<    "ip"<<    "jobs"<<       "join"<<    "kill"<<    "killall"<<    "less"
                                               <<    "let"<<    "link"<<    "ln"<<    "local"<<    "locate"<<    "logname"<<    "logout"<<    "look"
                                                  <<    "lpc"<<    "lpr"<<    "lprint"<<    "lprintd"<<    "lprintq"<<    "lprm"<<    "ls"<<    "lsof"
                                                     <<    "make"<<    "man"<<    "mkdir"<<    "mkfifo"<<    "mkisofs"<<    "mknod"<<    "more"<<    "most"
                                                        <<    "mount"<<    "mtools"<<    "mtr"<<    "mv"<<    "mmv"<<    "nc"<<    "netstat"<<    "nice"
                                                           <<    "nl"<<    "nohup"<<    "notify-send"<<    "nslookup"<<    "open"<<    "op"<<    "passwd"
                                                              <<    "paste"<<    "pathchk"<<    "ping"<<    "pkill"<<    "popd"<<    "pr"<<    "printcap"
                                                                 <<  "printenv"<<    "printf"<<    "ps"<<    "pushd"<<    "pv"<<    "pwd"<<    "q"<<    "quota"
                                                                  <<    "quotacheck"<<    "quotactl"<<    "r"<<    "ram"<<    "rar"<<    "rcp"<<       "read"
                                                                     <<   "readarray" <<    "readonly" <<    "reboot" <<    "rename" <<    "renice" <<    "remsync"
                                                                       <<    "return" <<    "rev"<<    "rm" << "rmdir" <<    "rsync"<<   "screen" <<    "scp"
                                                                          <<    "sdiff"<<    "sed"<<    "select"<<    "seq"<<    "set"<<    "sftp"<<    "shift"
                                                                             <<    "shopt" <<    "shutdown"<<    "sleep"<<    "slocate"<<    "sort"<<    "source"<<    "split"
                                                                                <<    "ssh"<<    "stat"<<    "strace"<<    "su"<<    "sudo"<<    "sum"<<    "suspend"<<    "sync"<<    "tail"
                                                                                   <<    "tar"<<    "tee"<<    "test"<<    "time"<<    "timeout"<<    "times"<<    "touch"<<    "top"
                                                                                      <<    "tput"<<    "traceroute"<<    "trap"<<    "tr"<<    "true"<<    "tsort"<<    "tty"<<    "type"
                                                                                         <<    "ulimit"<<    "umask"<<    "umount"<<    "unalias"<<    "uname"<<    "unexpand"
                                                                                            <<   "uniq"<<    "units"<<    "unrar"<<    "unset"<<    "unshar"<<    "until"<<    "uptime"
                                                                                              <<    "useradd"<<    "userdel"<<    "usermod"<<    "users"<<    "uuencode"<<    "uudecode"
                                                                                                 <<    "v"<<    "vdir"<<    "vi"<<    "vmstat"<<    "wait"<<    "watch"<<    "wc"<<    "whereis"
                                                                                                    <<    "which"<<    "while"<<    "who"<<    "whoami"<<    "wget"<<    "write"<<    "xargs"
                                                                                                       <<    "xdg-open"    "xz"<<    "yes"<<    "zip";

    commandKeyword.setForeground(QColor("#A25100"));
    foreach (QString pattern, commandList) {
        rule.pattern = QRegExp(pattern + "\\ ");
        rule.format = commandKeyword;
        highlightingRules.append(rule);
    }

    keywordFormat.setForeground(Qt::darkRed);
    QStringList keywordPatterns;
    keywordPatterns << "if " << "then" << "elif " << "else" << "fi" << "while " << "do" << "done" << "until " << "for "
                    << "\\&" << "\\|" << "\\ \\+\\ " << "\\\\" << "\\ /\\ " << "\\ \\*\\ " << "\\ \\-\\ " << ":" << ";" << "<" << ">"
                    << "\\[" << "\\]" << "\\$\\[" << "\\{" << "\\}" << "\\$\\{" << "!" << "=";
    foreach (QString pattern, keywordPatterns) {
        rule.pattern = QRegExp(pattern);
        rule.format = keywordFormat;
        highlightingRules.append(rule);
    }

    variables.setForeground(QColor("#00FF00"));
    rule.pattern = QRegExp("[a-zA-Z][a-zA-Z0-9]*=");
    rule.format = variables;
    highlightingRules.append(rule);
    rule.pattern = QRegExp("\\$[a-zA-Z][a-zA-Z0-9]*");
    rule.format = variables;
    highlightingRules.append(rule);

    path.setForeground(Qt::darkBlue);
    rule.pattern = QRegExp("/[A-Za-z0-9.\\-_/]*\\ ");
    rule.format = path;
    highlightingRules.append(rule);

    optionsFormat.setForeground(Qt::blue);
    rule.pattern = QRegExp("\\ \\-[a-zA-Z0-9]*\\ ");
    rule.format = optionsFormat;
    highlightingRules.append(rule);
    rule.pattern = QRegExp("\\ \\-\\-[a-zA-Z0-9]*\\ ");
    rule.format = optionsFormat;
    highlightingRules.append(rule);

    singleLineCommentFormat.setForeground(Qt::gray);
    singleLineCommentFormat.setFontItalic(true);
    rule.pattern = QRegExp("#[a-zA-Z0-9,.\\;\\:\\-_\\ ]*");
    rule.format = singleLineCommentFormat;
    highlightingRules.append(rule);

    quotationFormat.setForeground(Qt::darkGreen);
    rule.pattern = QRegExp("\".*\"");
    rule.format = quotationFormat;
    highlightingRules.append(rule);

    shebang.setForeground(Qt::darkCyan );
    rule.pattern = QRegExp("#!/bin/bash");
    rule.format = shebang;
    highlightingRules.append(rule);
}

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

    setCurrentBlockState(0);
}

bashhighlighter.h

#include <QSyntaxHighlighter>
#include <QStringList>
class BashSyntaxHighlighter : public QSyntaxHighlighter {
public:

    BashSyntaxHighlighter(QObject* parent=new QObject());
    BashSyntaxHighlighter(QTextDocument* parent);
    void highlightBlock(const QString &text);

private:
    struct HighlightingRule {
        QRegExp pattern;
        QTextCharFormat format;
    };
    QVector<HighlightingRule> highlightingRules;

    QRegExp commentStartExpression;
    QRegExp commentEndExpression;

    QTextCharFormat keywordFormat;
    QTextCharFormat commandKeyword;
    QTextCharFormat operatorKeyword;
    QTextCharFormat variables;
    QTextCharFormat shebang;
    QTextCharFormat path;
    QTextCharFormat optionsFormat;
    QTextCharFormat singleLineCommentFormat;
    QTextCharFormat multiLineCommentFormat;
    QTextCharFormat quotationFormat;
    QTextCharFormat functionFormat;
};