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LexOthers.cxx

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// Scintilla source code edit control
/** @file LexOthers.cxx
 ** Lexers for batch files, diff results, properties files, make files and error lists.
 ** Also lexer for LaTeX documents.
 **/
// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdarg.h>

#include "Platform.h"

#include "CharClassify.h"
#include "PropSet.h"
#include "Accessor.h"
#include "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"

#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif

static bool strstart(const char *haystack, const char *needle) {
      return strncmp(haystack, needle, strlen(needle)) == 0;
}

static bool Is0To9(char ch) {
      return (ch >= '0') && (ch <= '9');
}

static bool Is1To9(char ch) {
      return (ch >= '1') && (ch <= '9');
}

static inline bool AtEOL(Accessor &styler, unsigned int i) {
      return (styler[i] == '\n') ||
             ((styler[i] == '\r') && (styler.SafeGetCharAt(i + 1) != '\n'));
}

// Tests for BATCH Operators
static bool IsBOperator(char ch) {
      return (ch == '=') || (ch == '+') || (ch == '>') || (ch == '<') ||
            (ch == '|') || (ch == '?') || (ch == '*');
}

// Tests for BATCH Separators
static bool IsBSeparator(char ch) {
      return (ch == '\\') || (ch == '.') || (ch == ';') ||
            (ch == '\"') || (ch == '\'') || (ch == '/') || (ch == ')');
}

static void ColouriseBatchLine(
    char *lineBuffer,
    unsigned int lengthLine,
    unsigned int startLine,
    unsigned int endPos,
    WordList *keywordlists[],
    Accessor &styler) {

      unsigned int offset = 0;      // Line Buffer Offset
      unsigned int cmdLoc;          // External Command / Program Location
      char wordBuffer[81];          // Word Buffer - large to catch long paths
      unsigned int wbl;       // Word Buffer Length
      unsigned int wbo;       // Word Buffer Offset - also Special Keyword Buffer Length
      WordList &keywords = *keywordlists[0];      // Internal Commands
      WordList &keywords2 = *keywordlists[1];     // External Commands (optional)

      // CHOICE, ECHO, GOTO, PROMPT and SET have Default Text that may contain Regular Keywords
      //   Toggling Regular Keyword Checking off improves readability
      // Other Regular Keywords and External Commands / Programs might also benefit from toggling
      //   Need a more robust algorithm to properly toggle Regular Keyword Checking
      bool continueProcessing = true;     // Used to toggle Regular Keyword Checking
      // Special Keywords are those that allow certain characters without whitespace after the command
      // Examples are: cd. cd\ md. rd. dir| dir> echo: echo. path=
      // Special Keyword Buffer used to determine if the first n characters is a Keyword
      char sKeywordBuffer[10];      // Special Keyword Buffer
      bool sKeywordFound;           // Exit Special Keyword for-loop if found

      // Skip initial spaces
      while ((offset < lengthLine) && (isspacechar(lineBuffer[offset]))) {
            offset++;
      }
      // Colorize Default Text
      styler.ColourTo(startLine + offset - 1, SCE_BAT_DEFAULT);
      // Set External Command / Program Location
      cmdLoc = offset;

      // Check for Fake Label (Comment) or Real Label - return if found
      if (lineBuffer[offset] == ':') {
            if (lineBuffer[offset + 1] == ':') {
                  // Colorize Fake Label (Comment) - :: is similar to REM, see http://content.techweb.com/winmag/columns/explorer/2000/21.htm
                  styler.ColourTo(endPos, SCE_BAT_COMMENT);
            } else {
                  // Colorize Real Label
                  styler.ColourTo(endPos, SCE_BAT_LABEL);
            }
            return;
      // Check for Drive Change (Drive Change is internal command) - return if found
      } else if ((isalpha(lineBuffer[offset])) &&
            (lineBuffer[offset + 1] == ':') &&
            ((isspacechar(lineBuffer[offset + 2])) ||
            (((lineBuffer[offset + 2] == '\\')) &&
            (isspacechar(lineBuffer[offset + 3]))))) {
            // Colorize Regular Keyword
            styler.ColourTo(endPos, SCE_BAT_WORD);
            return;
      }

      // Check for Hide Command (@ECHO OFF/ON)
      if (lineBuffer[offset] == '@') {
            styler.ColourTo(startLine + offset, SCE_BAT_HIDE);
            offset++;
      }
      // Skip next spaces
      while ((offset < lengthLine) && (isspacechar(lineBuffer[offset]))) {
            offset++;
      }

      // Read remainder of line word-at-a-time or remainder-of-word-at-a-time
      while (offset < lengthLine) {
            if (offset > startLine) {
                  // Colorize Default Text
                  styler.ColourTo(startLine + offset - 1, SCE_BAT_DEFAULT);
            }
            // Copy word from Line Buffer into Word Buffer
            wbl = 0;
            for (; offset < lengthLine && wbl < 80 &&
                    !isspacechar(lineBuffer[offset]); wbl++, offset++) {
                  wordBuffer[wbl] = static_cast<char>(tolower(lineBuffer[offset]));
            }
            wordBuffer[wbl] = '\0';
            wbo = 0;

            // Check for Comment - return if found
            if (CompareCaseInsensitive(wordBuffer, "rem") == 0) {
                  styler.ColourTo(endPos, SCE_BAT_COMMENT);
                  return;
            }
            // Check for Separator
            if (IsBSeparator(wordBuffer[0])) {
                  // Check for External Command / Program
                  if ((cmdLoc == offset - wbl) &&
                        ((wordBuffer[0] == ':') ||
                        (wordBuffer[0] == '\\') ||
                        (wordBuffer[0] == '.'))) {
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 1);
                        // Colorize External Command / Program
                        if (!keywords2) {
                              styler.ColourTo(startLine + offset - 1, SCE_BAT_COMMAND);
                        } else if (keywords2.InList(wordBuffer)) {
                              styler.ColourTo(startLine + offset - 1, SCE_BAT_COMMAND);
                        } else {
                              styler.ColourTo(startLine + offset - 1, SCE_BAT_DEFAULT);
                        }
                        // Reset External Command / Program Location
                        cmdLoc = offset;
                  } else {
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 1);
                        // Colorize Default Text
                        styler.ColourTo(startLine + offset - 1, SCE_BAT_DEFAULT);
                  }
            // Check for Regular Keyword in list
            } else if ((keywords.InList(wordBuffer)) &&
                  (continueProcessing)) {
                  // ECHO, GOTO, PROMPT and SET require no further Regular Keyword Checking
                  if ((CompareCaseInsensitive(wordBuffer, "echo") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "goto") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "prompt") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "set") == 0)) {
                        continueProcessing = false;
                  }
                  // Identify External Command / Program Location for ERRORLEVEL, and EXIST
                  if ((CompareCaseInsensitive(wordBuffer, "errorlevel") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "exist") == 0)) {
                        // Reset External Command / Program Location
                        cmdLoc = offset;
                        // Skip next spaces
                        while ((cmdLoc < lengthLine) &&
                              (isspacechar(lineBuffer[cmdLoc]))) {
                              cmdLoc++;
                        }
                        // Skip comparison
                        while ((cmdLoc < lengthLine) &&
                              (!isspacechar(lineBuffer[cmdLoc]))) {
                              cmdLoc++;
                        }
                        // Skip next spaces
                        while ((cmdLoc < lengthLine) &&
                              (isspacechar(lineBuffer[cmdLoc]))) {
                              cmdLoc++;
                        }
                  // Identify External Command / Program Location for CALL, DO, LOADHIGH and LH
                  } else if ((CompareCaseInsensitive(wordBuffer, "call") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "do") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "loadhigh") == 0) ||
                        (CompareCaseInsensitive(wordBuffer, "lh") == 0)) {
                        // Reset External Command / Program Location
                        cmdLoc = offset;
                        // Skip next spaces
                        while ((cmdLoc < lengthLine) &&
                              (isspacechar(lineBuffer[cmdLoc]))) {
                              cmdLoc++;
                        }
                  }
                  // Colorize Regular keyword
                  styler.ColourTo(startLine + offset - 1, SCE_BAT_WORD);
                  // No need to Reset Offset
            // Check for Special Keyword in list, External Command / Program, or Default Text
            } else if ((wordBuffer[0] != '%') &&
                           (wordBuffer[0] != '!') &&
                  (!IsBOperator(wordBuffer[0])) &&
                  (continueProcessing)) {
                  // Check for Special Keyword
                  //     Affected Commands are in Length range 2-6
                  //     Good that ERRORLEVEL, EXIST, CALL, DO, LOADHIGH, and LH are unaffected
                  sKeywordFound = false;
                  for (unsigned int keywordLength = 2; keywordLength < wbl && keywordLength < 7 && !sKeywordFound; keywordLength++) {
                        wbo = 0;
                        // Copy Keyword Length from Word Buffer into Special Keyword Buffer
                        for (; wbo < keywordLength; wbo++) {
                              sKeywordBuffer[wbo] = static_cast<char>(wordBuffer[wbo]);
                        }
                        sKeywordBuffer[wbo] = '\0';
                        // Check for Special Keyword in list
                        if ((keywords.InList(sKeywordBuffer)) &&
                              ((IsBOperator(wordBuffer[wbo])) ||
                              (IsBSeparator(wordBuffer[wbo])))) {
                              sKeywordFound = true;
                              // ECHO requires no further Regular Keyword Checking
                              if (CompareCaseInsensitive(sKeywordBuffer, "echo") == 0) {
                                    continueProcessing = false;
                              }
                              // Colorize Special Keyword as Regular Keyword
                              styler.ColourTo(startLine + offset - 1 - (wbl - wbo), SCE_BAT_WORD);
                              // Reset Offset to re-process remainder of word
                              offset -= (wbl - wbo);
                        }
                  }
                  // Check for External Command / Program or Default Text
                  if (!sKeywordFound) {
                        wbo = 0;
                        // Check for External Command / Program
                        if (cmdLoc == offset - wbl) {
                              // Read up to %, Operator or Separator
                              while ((wbo < wbl) &&
                                    (wordBuffer[wbo] != '%') &&
                                    (wordBuffer[wbo] != '!') &&
                                    (!IsBOperator(wordBuffer[wbo])) &&
                                    (!IsBSeparator(wordBuffer[wbo]))) {
                                    wbo++;
                              }
                              // Reset External Command / Program Location
                              cmdLoc = offset - (wbl - wbo);
                              // Reset Offset to re-process remainder of word
                              offset -= (wbl - wbo);
                              // CHOICE requires no further Regular Keyword Checking
                              if (CompareCaseInsensitive(wordBuffer, "choice") == 0) {
                                    continueProcessing = false;
                              }
                              // Check for START (and its switches) - What follows is External Command \ Program
                              if (CompareCaseInsensitive(wordBuffer, "start") == 0) {
                                    // Reset External Command / Program Location
                                    cmdLoc = offset;
                                    // Skip next spaces
                                    while ((cmdLoc < lengthLine) &&
                                          (isspacechar(lineBuffer[cmdLoc]))) {
                                          cmdLoc++;
                                    }
                                    // Reset External Command / Program Location if command switch detected
                                    if (lineBuffer[cmdLoc] == '/') {
                                          // Skip command switch
                                          while ((cmdLoc < lengthLine) &&
                                                (!isspacechar(lineBuffer[cmdLoc]))) {
                                                cmdLoc++;
                                          }
                                          // Skip next spaces
                                          while ((cmdLoc < lengthLine) &&
                                                (isspacechar(lineBuffer[cmdLoc]))) {
                                                cmdLoc++;
                                          }
                                    }
                              }
                              // Colorize External Command / Program
                              if (!keywords2) {
                                    styler.ColourTo(startLine + offset - 1, SCE_BAT_COMMAND);
                              } else if (keywords2.InList(wordBuffer)) {
                                    styler.ColourTo(startLine + offset - 1, SCE_BAT_COMMAND);
                              } else {
                                    styler.ColourTo(startLine + offset - 1, SCE_BAT_DEFAULT);
                              }
                              // No need to Reset Offset
                        // Check for Default Text
                        } else {
                              // Read up to %, Operator or Separator
                              while ((wbo < wbl) &&
                                    (wordBuffer[wbo] != '%') &&
                                    (wordBuffer[wbo] != '!') &&
                                    (!IsBOperator(wordBuffer[wbo])) &&
                                    (!IsBSeparator(wordBuffer[wbo]))) {
                                    wbo++;
                              }
                              // Colorize Default Text
                              styler.ColourTo(startLine + offset - 1 - (wbl - wbo), SCE_BAT_DEFAULT);
                              // Reset Offset to re-process remainder of word
                              offset -= (wbl - wbo);
                        }
                  }
            // Check for Argument  (%n), Environment Variable (%x...%) or Local Variable (%%a)
            } else if (wordBuffer[0] == '%') {
                  // Colorize Default Text
                  styler.ColourTo(startLine + offset - 1 - wbl, SCE_BAT_DEFAULT);
                  wbo++;
                  // Search to end of word for second % (can be a long path)
                  while ((wbo < wbl) &&
                        (wordBuffer[wbo] != '%') &&
                        (!IsBOperator(wordBuffer[wbo])) &&
                        (!IsBSeparator(wordBuffer[wbo]))) {
                        wbo++;
                  }
                  // Check for Argument (%n) or (%*)
                  if (((Is0To9(wordBuffer[1])) || (wordBuffer[1] == '*')) &&
                        (wordBuffer[wbo] != '%')) {
                        // Check for External Command / Program
                        if (cmdLoc == offset - wbl) {
                              cmdLoc = offset - (wbl - 2);
                        }
                        // Colorize Argument
                        styler.ColourTo(startLine + offset - 1 - (wbl - 2), SCE_BAT_IDENTIFIER);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 2);
                  // Check for Expanded Argument (%~...) / Variable (%%~...)
                  } else if (((wbl > 1) && (wordBuffer[1] == '~')) ||
                        ((wbl > 2) && (wordBuffer[1] == '%') && (wordBuffer[2] == '~'))) {
                        // Check for External Command / Program
                        if (cmdLoc == offset - wbl) {
                              cmdLoc = offset - (wbl - wbo);
                        }
                        // Colorize Expanded Argument / Variable
                        styler.ColourTo(startLine + offset - 1 - (wbl - wbo), SCE_BAT_IDENTIFIER);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - wbo);
                  // Check for Environment Variable (%x...%)
                  } else if ((wordBuffer[1] != '%') &&
                        (wordBuffer[wbo] == '%')) {
                        wbo++;
                        // Check for External Command / Program
                        if (cmdLoc == offset - wbl) {
                              cmdLoc = offset - (wbl - wbo);
                        }
                        // Colorize Environment Variable
                        styler.ColourTo(startLine + offset - 1 - (wbl - wbo), SCE_BAT_IDENTIFIER);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - wbo);
                  // Check for Local Variable (%%a)
                  } else if (
                        (wbl > 2) &&
                        (wordBuffer[1] == '%') &&
                        (wordBuffer[2] != '%') &&
                        (!IsBOperator(wordBuffer[2])) &&
                        (!IsBSeparator(wordBuffer[2]))) {
                        // Check for External Command / Program
                        if (cmdLoc == offset - wbl) {
                              cmdLoc = offset - (wbl - 3);
                        }
                        // Colorize Local Variable
                        styler.ColourTo(startLine + offset - 1 - (wbl - 3), SCE_BAT_IDENTIFIER);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 3);
                  }
            // Check for Environment Variable (!x...!)
            } else if (wordBuffer[0] == '!') {
                  // Colorize Default Text
                  styler.ColourTo(startLine + offset - 1 - wbl, SCE_BAT_DEFAULT);
                  wbo++;
                  // Search to end of word for second ! (can be a long path)
                  while ((wbo < wbl) &&
                        (wordBuffer[wbo] != '!') &&
                        (!IsBOperator(wordBuffer[wbo])) &&
                        (!IsBSeparator(wordBuffer[wbo]))) {
                        wbo++;
                  }
                  if (wordBuffer[wbo] == '!') {
                        wbo++;
                        // Check for External Command / Program
                        if (cmdLoc == offset - wbl) {
                              cmdLoc = offset - (wbl - wbo);
                        }
                        // Colorize Environment Variable
                        styler.ColourTo(startLine + offset - 1 - (wbl - wbo), SCE_BAT_IDENTIFIER);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - wbo);
                  }
            // Check for Operator
            } else if (IsBOperator(wordBuffer[0])) {
                  // Colorize Default Text
                  styler.ColourTo(startLine + offset - 1 - wbl, SCE_BAT_DEFAULT);
                  // Check for Comparison Operator
                  if ((wordBuffer[0] == '=') && (wordBuffer[1] == '=')) {
                        // Identify External Command / Program Location for IF
                        cmdLoc = offset;
                        // Skip next spaces
                        while ((cmdLoc < lengthLine) &&
                              (isspacechar(lineBuffer[cmdLoc]))) {
                              cmdLoc++;
                        }
                        // Colorize Comparison Operator
                        styler.ColourTo(startLine + offset - 1 - (wbl - 2), SCE_BAT_OPERATOR);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 2);
                  // Check for Pipe Operator
                  } else if (wordBuffer[0] == '|') {
                        // Reset External Command / Program Location
                        cmdLoc = offset - wbl + 1;
                        // Skip next spaces
                        while ((cmdLoc < lengthLine) &&
                              (isspacechar(lineBuffer[cmdLoc]))) {
                              cmdLoc++;
                        }
                        // Colorize Pipe Operator
                        styler.ColourTo(startLine + offset - 1 - (wbl - 1), SCE_BAT_OPERATOR);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 1);
                  // Check for Other Operator
                  } else {
                        // Check for > Operator
                        if (wordBuffer[0] == '>') {
                              // Turn Keyword and External Command / Program checking back on
                              continueProcessing = true;
                        }
                        // Colorize Other Operator
                        styler.ColourTo(startLine + offset - 1 - (wbl - 1), SCE_BAT_OPERATOR);
                        // Reset Offset to re-process remainder of word
                        offset -= (wbl - 1);
                  }
            // Check for Default Text
            } else {
                  // Read up to %, Operator or Separator
                  while ((wbo < wbl) &&
                        (wordBuffer[wbo] != '%') &&
                        (wordBuffer[wbo] != '!') &&
                        (!IsBOperator(wordBuffer[wbo])) &&
                        (!IsBSeparator(wordBuffer[wbo]))) {
                        wbo++;
                  }
                  // Colorize Default Text
                  styler.ColourTo(startLine + offset - 1 - (wbl - wbo), SCE_BAT_DEFAULT);
                  // Reset Offset to re-process remainder of word
                  offset -= (wbl - wbo);
            }
            // Skip next spaces - nothing happens if Offset was Reset
            while ((offset < lengthLine) && (isspacechar(lineBuffer[offset]))) {
                  offset++;
            }
      }
      // Colorize Default Text for remainder of line - currently not lexed
      styler.ColourTo(endPos, SCE_BAT_DEFAULT);
}

static void ColouriseBatchDoc(
    unsigned int startPos,
    int length,
    int /*initStyle*/,
    WordList *keywordlists[],
    Accessor &styler) {

      char lineBuffer[1024];

      styler.StartAt(startPos);
      styler.StartSegment(startPos);
      unsigned int linePos = 0;
      unsigned int startLine = startPos;
      for (unsigned int i = startPos; i < startPos + length; i++) {
            lineBuffer[linePos++] = styler[i];
            if (AtEOL(styler, i) || (linePos >= sizeof(lineBuffer) - 1)) {
                  // End of line (or of line buffer) met, colourise it
                  lineBuffer[linePos] = '\0';
                  ColouriseBatchLine(lineBuffer, linePos, startLine, i, keywordlists, styler);
                  linePos = 0;
                  startLine = i + 1;
            }
      }
      if (linePos > 0) {      // Last line does not have ending characters
            lineBuffer[linePos] = '\0';
            ColouriseBatchLine(lineBuffer, linePos, startLine, startPos + length - 1,
                               keywordlists, styler);
      }
}

static void ColouriseDiffLine(char *lineBuffer, int endLine, Accessor &styler) {
      // It is needed to remember the current state to recognize starting
      // comment lines before the first "diff " or "--- ". If a real
      // difference starts then each line starting with ' ' is a whitespace
      // otherwise it is considered a comment (Only in..., Binary file...)
      if (0 == strncmp(lineBuffer, "diff ", 5)) {
            styler.ColourTo(endLine, SCE_DIFF_COMMAND);
      } else if (0 == strncmp(lineBuffer, "Index: ", 7)) {  // For subversion's diff
            styler.ColourTo(endLine, SCE_DIFF_COMMAND);
      } else if (0 == strncmp(lineBuffer, "---", 3)) {
            // In a context diff, --- appears in both the header and the position markers
            if (lineBuffer[3] == ' ' && atoi(lineBuffer + 4) && !strchr(lineBuffer, '/'))
                  styler.ColourTo(endLine, SCE_DIFF_POSITION);
            else if (lineBuffer[3] == '\r' || lineBuffer[3] == '\n')
                  styler.ColourTo(endLine, SCE_DIFF_POSITION);
            else
                  styler.ColourTo(endLine, SCE_DIFF_HEADER);
      } else if (0 == strncmp(lineBuffer, "+++ ", 4)) {
            // I don't know of any diff where "+++ " is a position marker, but for
            // consistency, do the same as with "--- " and "*** ".
            if (atoi(lineBuffer+4) && !strchr(lineBuffer, '/'))
                  styler.ColourTo(endLine, SCE_DIFF_POSITION);
            else
                  styler.ColourTo(endLine, SCE_DIFF_HEADER);
      } else if (0 == strncmp(lineBuffer, "====", 4)) {  // For p4's diff
            styler.ColourTo(endLine, SCE_DIFF_HEADER);
      } else if (0 == strncmp(lineBuffer, "***", 3)) {
            // In a context diff, *** appears in both the header and the position markers.
            // Also ******** is a chunk header, but here it's treated as part of the
            // position marker since there is no separate style for a chunk header.
            if (lineBuffer[3] == ' ' && atoi(lineBuffer+4) && !strchr(lineBuffer, '/'))
                  styler.ColourTo(endLine, SCE_DIFF_POSITION);
            else if (lineBuffer[3] == '*')
                  styler.ColourTo(endLine, SCE_DIFF_POSITION);
            else
                  styler.ColourTo(endLine, SCE_DIFF_HEADER);
      } else if (0 == strncmp(lineBuffer, "? ", 2)) {    // For difflib
            styler.ColourTo(endLine, SCE_DIFF_HEADER);
      } else if (lineBuffer[0] == '@') {
            styler.ColourTo(endLine, SCE_DIFF_POSITION);
      } else if (lineBuffer[0] >= '0' && lineBuffer[0] <= '9') {
            styler.ColourTo(endLine, SCE_DIFF_POSITION);
      } else if (lineBuffer[0] == '-' || lineBuffer[0] == '<') {
            styler.ColourTo(endLine, SCE_DIFF_DELETED);
      } else if (lineBuffer[0] == '+' || lineBuffer[0] == '>') {
            styler.ColourTo(endLine, SCE_DIFF_ADDED);
      } else if (lineBuffer[0] == '!') {
            styler.ColourTo(endLine, SCE_DIFF_CHANGED);
      } else if (lineBuffer[0] != ' ') {
            styler.ColourTo(endLine, SCE_DIFF_COMMENT);
      } else {
            styler.ColourTo(endLine, SCE_DIFF_DEFAULT);
      }
}

static void ColouriseDiffDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      char lineBuffer[1024];
      styler.StartAt(startPos);
      styler.StartSegment(startPos);
      unsigned int linePos = 0;
      for (unsigned int i = startPos; i < startPos + length; i++) {
            lineBuffer[linePos++] = styler[i];
            if (AtEOL(styler, i) || (linePos >= sizeof(lineBuffer) - 1)) {
                  // End of line (or of line buffer) met, colourise it
                  lineBuffer[linePos] = '\0';
                  ColouriseDiffLine(lineBuffer, i, styler);
                  linePos = 0;
            }
      }
      if (linePos > 0) {      // Last line does not have ending characters
            ColouriseDiffLine(lineBuffer, startPos + length - 1, styler);
      }
}

static void FoldDiffDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      int curLine = styler.GetLine(startPos);
      int curLineStart = styler.LineStart(curLine);
      int prevLevel = curLine > 0 ? styler.LevelAt(curLine - 1) : SC_FOLDLEVELBASE;
      int nextLevel;

      do {
            int lineType = styler.StyleAt(curLineStart);
            if (lineType == SCE_DIFF_COMMAND)
                  nextLevel = SC_FOLDLEVELBASE | SC_FOLDLEVELHEADERFLAG;
            else if (lineType == SCE_DIFF_HEADER)
                  nextLevel = (SC_FOLDLEVELBASE + 1) | SC_FOLDLEVELHEADERFLAG;
            else if (lineType == SCE_DIFF_POSITION && styler[curLineStart] != '-')
                  nextLevel = (SC_FOLDLEVELBASE + 2) | SC_FOLDLEVELHEADERFLAG;
            else if (prevLevel & SC_FOLDLEVELHEADERFLAG)
                  nextLevel = (prevLevel & SC_FOLDLEVELNUMBERMASK) + 1;
            else
                  nextLevel = prevLevel;

            if ((nextLevel & SC_FOLDLEVELHEADERFLAG) && (nextLevel == prevLevel))
                  styler.SetLevel(curLine-1, prevLevel & ~SC_FOLDLEVELHEADERFLAG);

            styler.SetLevel(curLine, nextLevel);
            prevLevel = nextLevel;

            curLineStart = styler.LineStart(++curLine);
      } while (static_cast<int>(startPos) + length > curLineStart);
}

static void ColourisePoLine(
    char *lineBuffer,
    unsigned int lengthLine,
    unsigned int startLine,
    unsigned int endPos,
    Accessor &styler) {

      unsigned int i = 0;
      static unsigned int state = SCE_PO_DEFAULT;
      unsigned int state_start = SCE_PO_DEFAULT;

      while ((i < lengthLine) && isspacechar(lineBuffer[i]))      // Skip initial spaces
            i++;
      if (i < lengthLine) {
            if (lineBuffer[i] == '#') {
                  // check if the comment contains any flags ("#, ") and
                  // then whether the flags contain "fuzzy"
                  if (strstart(lineBuffer, "#, ") && strstr(lineBuffer, "fuzzy"))
                        styler.ColourTo(endPos, SCE_PO_FUZZY);
                  else
                        styler.ColourTo(endPos, SCE_PO_COMMENT);
            } else {
                  if (lineBuffer[0] == '"') {
                        // line continuation, use previous style
                        styler.ColourTo(endPos, state);
                        return;
                  // this implicitly also matches "msgid_plural"
                  } else if (strstart(lineBuffer, "msgid")) {
                        state_start = SCE_PO_MSGID;
                        state = SCE_PO_MSGID_TEXT;
                  } else if (strstart(lineBuffer, "msgstr")) {
                        state_start = SCE_PO_MSGSTR;
                        state = SCE_PO_MSGSTR_TEXT;
                  } else if (strstart(lineBuffer, "msgctxt")) {
                        state_start = SCE_PO_MSGCTXT;
                        state = SCE_PO_MSGCTXT_TEXT;
                  }
                  if (state_start != SCE_PO_DEFAULT) {
                        // find the next space
                        while ((i < lengthLine) && ! isspacechar(lineBuffer[i]))
                              i++;
                        styler.ColourTo(startLine + i - 1, state_start);
                        styler.ColourTo(startLine + i, SCE_PO_DEFAULT);
                        styler.ColourTo(endPos, state);
                  }
            }
      } else {
            styler.ColourTo(endPos, SCE_PO_DEFAULT);
      }
}

static void ColourisePoDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      char lineBuffer[1024];
      styler.StartAt(startPos);
      styler.StartSegment(startPos);
      unsigned int linePos = 0;
      unsigned int startLine = startPos;
      for (unsigned int i = startPos; i < startPos + length; i++) {
            lineBuffer[linePos++] = styler[i];
            if (AtEOL(styler, i) || (linePos >= sizeof(lineBuffer) - 1)) {
                  // End of line (or of line buffer) met, colourise it
                  lineBuffer[linePos] = '\0';
                  ColourisePoLine(lineBuffer, linePos, startLine, i, styler);
                  linePos = 0;
                  startLine = i + 1;
            }
      }
      if (linePos > 0) {      // Last line does not have ending characters
            ColourisePoLine(lineBuffer, linePos, startLine, startPos + length - 1, styler);
      }
}

static inline bool isassignchar(unsigned char ch) {
      return (ch == '=') || (ch == ':');
}

static void ColourisePropsLine(
    char *lineBuffer,
    unsigned int lengthLine,
    unsigned int startLine,
    unsigned int endPos,
    Accessor &styler,
    bool allowInitialSpaces) {

      unsigned int i = 0;
      if (allowInitialSpaces) {
            while ((i < lengthLine) && isspacechar(lineBuffer[i]))      // Skip initial spaces
                  i++;
      } else {
            if (isspacechar(lineBuffer[i])) // don't allow initial spaces
                  i = lengthLine;
      }

      if (i < lengthLine) {
            if (lineBuffer[i] == '#' || lineBuffer[i] == '!' || lineBuffer[i] == ';') {
                  styler.ColourTo(endPos, SCE_PROPS_COMMENT);
            } else if (lineBuffer[i] == '[') {
                  styler.ColourTo(endPos, SCE_PROPS_SECTION);
            } else if (lineBuffer[i] == '@') {
                  styler.ColourTo(startLine + i, SCE_PROPS_DEFVAL);
                  if (isassignchar(lineBuffer[i++]))
                        styler.ColourTo(startLine + i, SCE_PROPS_ASSIGNMENT);
                  styler.ColourTo(endPos, SCE_PROPS_DEFAULT);
            } else {
                  // Search for the '=' character
                  while ((i < lengthLine) && !isassignchar(lineBuffer[i]))
                        i++;
                  if ((i < lengthLine) && isassignchar(lineBuffer[i])) {
                        styler.ColourTo(startLine + i - 1, SCE_PROPS_KEY);
                        styler.ColourTo(startLine + i, SCE_PROPS_ASSIGNMENT);
                        styler.ColourTo(endPos, SCE_PROPS_DEFAULT);
                  } else {
                        styler.ColourTo(endPos, SCE_PROPS_DEFAULT);
                  }
            }
      } else {
            styler.ColourTo(endPos, SCE_PROPS_DEFAULT);
      }
}

static void ColourisePropsDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      char lineBuffer[1024];
      styler.StartAt(startPos);
      styler.StartSegment(startPos);
      unsigned int linePos = 0;
      unsigned int startLine = startPos;

      // property lexer.props.allow.initial.spaces 
      //    For properties files, set to 0 to style all lines that start with whitespace in the default style. 
      //    This is not suitable for SciTE .properties files which use indentation for flow control but 
      //    can be used for RFC2822 text where indentation is used for continuation lines. 
      bool allowInitialSpaces = styler.GetPropertyInt("lexer.props.allow.initial.spaces", 1) != 0;

      for (unsigned int i = startPos; i < startPos + length; i++) {
            lineBuffer[linePos++] = styler[i];
            if (AtEOL(styler, i) || (linePos >= sizeof(lineBuffer) - 1)) {
                  // End of line (or of line buffer) met, colourise it
                  lineBuffer[linePos] = '\0';
                  ColourisePropsLine(lineBuffer, linePos, startLine, i, styler, allowInitialSpaces);
                  linePos = 0;
                  startLine = i + 1;
            }
      }
      if (linePos > 0) {      // Last line does not have ending characters
            ColourisePropsLine(lineBuffer, linePos, startLine, startPos + length - 1, styler, allowInitialSpaces);
      }
}

// adaption by ksc, using the "} else {" trick of 1.53
// 030721
static void FoldPropsDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;

      unsigned int endPos = startPos + length;
      int visibleChars = 0;
      int lineCurrent = styler.GetLine(startPos);

      char chNext = styler[startPos];
      int styleNext = styler.StyleAt(startPos);
      bool headerPoint = false;
      int lev;

      for (unsigned int i = startPos; i < endPos; i++) {
            char ch = chNext;
            chNext = styler[i+1];

            int style = styleNext;
            styleNext = styler.StyleAt(i + 1);
            bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');

            if (style == SCE_PROPS_SECTION) {
                  headerPoint = true;
            }

            if (atEOL) {
                  lev = SC_FOLDLEVELBASE;

                  if (lineCurrent > 0) {
                        int levelPrevious = styler.LevelAt(lineCurrent - 1);

                        if (levelPrevious & SC_FOLDLEVELHEADERFLAG) {
                              lev = SC_FOLDLEVELBASE + 1;
                        } else {
                              lev = levelPrevious & SC_FOLDLEVELNUMBERMASK;
                        }
                  }

                  if (headerPoint) {
                        lev = SC_FOLDLEVELBASE;
                  }
                  if (visibleChars == 0 && foldCompact)
                        lev |= SC_FOLDLEVELWHITEFLAG;

                  if (headerPoint) {
                        lev |= SC_FOLDLEVELHEADERFLAG;
                  }
                  if (lev != styler.LevelAt(lineCurrent)) {
                        styler.SetLevel(lineCurrent, lev);
                  }

                  lineCurrent++;
                  visibleChars = 0;
                  headerPoint = false;
            }
            if (!isspacechar(ch))
                  visibleChars++;
      }

      if (lineCurrent > 0) {
            int levelPrevious = styler.LevelAt(lineCurrent - 1);
            if (levelPrevious & SC_FOLDLEVELHEADERFLAG) {
                  lev = SC_FOLDLEVELBASE + 1;
            } else {
                  lev = levelPrevious & SC_FOLDLEVELNUMBERMASK;
            }
      } else {
            lev = SC_FOLDLEVELBASE;
      }
      int flagsNext = styler.LevelAt(lineCurrent);
      styler.SetLevel(lineCurrent, lev | (flagsNext & ~SC_FOLDLEVELNUMBERMASK));
}

static void ColouriseMakeLine(
    char *lineBuffer,
    unsigned int lengthLine,
    unsigned int startLine,
    unsigned int endPos,
    Accessor &styler) {

      unsigned int i = 0;
      int lastNonSpace = -1;
      unsigned int state = SCE_MAKE_DEFAULT;
      bool bSpecial = false;

      // check for a tab character in column 0 indicating a command
      bool bCommand = false;
      if ((lengthLine > 0) && (lineBuffer[0] == '\t'))
            bCommand = true;

      // Skip initial spaces
      while ((i < lengthLine) && isspacechar(lineBuffer[i])) {
            i++;
      }
      if (lineBuffer[i] == '#') {   // Comment
            styler.ColourTo(endPos, SCE_MAKE_COMMENT);
            return;
      }
      if (lineBuffer[i] == '!') {   // Special directive
            styler.ColourTo(endPos, SCE_MAKE_PREPROCESSOR);
            return;
      }
      while (i < lengthLine) {
            if (lineBuffer[i] == '$' && lineBuffer[i + 1] == '(') {
                  styler.ColourTo(startLine + i - 1, state);
                  state = SCE_MAKE_IDENTIFIER;
            } else if (state == SCE_MAKE_IDENTIFIER && lineBuffer[i] == ')') {
                  styler.ColourTo(startLine + i, state);
                  state = SCE_MAKE_DEFAULT;
            }

            // skip identifier and target styling if this is a command line
            if (!bSpecial && !bCommand) {
                  if (lineBuffer[i] == ':') {
                        if (((i + 1) < lengthLine) && (lineBuffer[i + 1] == '=')) {
                              // it's a ':=', so style as an identifier
                              if (lastNonSpace >= 0)
                                    styler.ColourTo(startLine + lastNonSpace, SCE_MAKE_IDENTIFIER);
                              styler.ColourTo(startLine + i - 1, SCE_MAKE_DEFAULT);
                              styler.ColourTo(startLine + i + 1, SCE_MAKE_OPERATOR);
                        } else {
                              // We should check that no colouring was made since the beginning of the line,
                              // to avoid colouring stuff like /OUT:file
                              if (lastNonSpace >= 0)
                                    styler.ColourTo(startLine + lastNonSpace, SCE_MAKE_TARGET);
                              styler.ColourTo(startLine + i - 1, SCE_MAKE_DEFAULT);
                              styler.ColourTo(startLine + i, SCE_MAKE_OPERATOR);
                        }
                        bSpecial = true;  // Only react to the first ':' of the line
                        state = SCE_MAKE_DEFAULT;
                  } else if (lineBuffer[i] == '=') {
                        if (lastNonSpace >= 0)
                              styler.ColourTo(startLine + lastNonSpace, SCE_MAKE_IDENTIFIER);
                        styler.ColourTo(startLine + i - 1, SCE_MAKE_DEFAULT);
                        styler.ColourTo(startLine + i, SCE_MAKE_OPERATOR);
                        bSpecial = true;  // Only react to the first '=' of the line
                        state = SCE_MAKE_DEFAULT;
                  }
            }
            if (!isspacechar(lineBuffer[i])) {
                  lastNonSpace = i;
            }
            i++;
      }
      if (state == SCE_MAKE_IDENTIFIER) {
            styler.ColourTo(endPos, SCE_MAKE_IDEOL);  // Error, variable reference not ended
      } else {
            styler.ColourTo(endPos, SCE_MAKE_DEFAULT);
      }
}

static void ColouriseMakeDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      char lineBuffer[1024];
      styler.StartAt(startPos);
      styler.StartSegment(startPos);
      unsigned int linePos = 0;
      unsigned int startLine = startPos;
      for (unsigned int i = startPos; i < startPos + length; i++) {
            lineBuffer[linePos++] = styler[i];
            if (AtEOL(styler, i) || (linePos >= sizeof(lineBuffer) - 1)) {
                  // End of line (or of line buffer) met, colourise it
                  lineBuffer[linePos] = '\0';
                  ColouriseMakeLine(lineBuffer, linePos, startLine, i, styler);
                  linePos = 0;
                  startLine = i + 1;
            }
      }
      if (linePos > 0) {      // Last line does not have ending characters
            ColouriseMakeLine(lineBuffer, linePos, startLine, startPos + length - 1, styler);
      }
}

static int RecogniseErrorListLine(const char *lineBuffer, unsigned int lengthLine, int &startValue) {
      if (lineBuffer[0] == '>') {
            // Command or return status
            return SCE_ERR_CMD;
      } else if (lineBuffer[0] == '<') {
            // Diff removal, but not interested. Trapped to avoid hitting CTAG cases.
            return SCE_ERR_DEFAULT;
      } else if (lineBuffer[0] == '!') {
            return SCE_ERR_DIFF_CHANGED;
      } else if (lineBuffer[0] == '+') {
            if (strstart(lineBuffer, "+++ ")) {
                  return SCE_ERR_DIFF_MESSAGE;
            } else {
                  return SCE_ERR_DIFF_ADDITION;
            }
      } else if (lineBuffer[0] == '-') {
            if (strstart(lineBuffer, "--- ")) {
                  return SCE_ERR_DIFF_MESSAGE;
            } else {
                  return SCE_ERR_DIFF_DELETION;
            }
      } else if (strstart(lineBuffer, "cf90-")) {
            // Absoft Pro Fortran 90/95 v8.2 error and/or warning message
            return SCE_ERR_ABSF;
      } else if (strstart(lineBuffer, "fortcom:")) {
            // Intel Fortran Compiler v8.0 error/warning message
            return SCE_ERR_IFORT;
      } else if (strstr(lineBuffer, "File \"") && strstr(lineBuffer, ", line ")) {
            return SCE_ERR_PYTHON;
      } else if (strstr(lineBuffer, " in ") && strstr(lineBuffer, " on line ")) {
            return SCE_ERR_PHP;
      } else if ((strstart(lineBuffer, "Error ") ||
                  strstart(lineBuffer, "Warning ")) &&
                 strstr(lineBuffer, " at (") &&
                 strstr(lineBuffer, ") : ") &&
                 (strstr(lineBuffer, " at (") < strstr(lineBuffer, ") : "))) {
            // Intel Fortran Compiler error/warning message
            return SCE_ERR_IFC;
      } else if (strstart(lineBuffer, "Error ")) {
            // Borland error message
            return SCE_ERR_BORLAND;
      } else if (strstart(lineBuffer, "Warning ")) {
            // Borland warning message
            return SCE_ERR_BORLAND;
      } else if (strstr(lineBuffer, "at line " ) &&
                 (strstr(lineBuffer, "at line " ) < (lineBuffer + lengthLine)) &&
                 strstr(lineBuffer, "file ") &&
                 (strstr(lineBuffer, "file ") < (lineBuffer + lengthLine))) {
            // Lua 4 error message
            return SCE_ERR_LUA;
      } else if (strstr(lineBuffer, " at " ) &&
                 (strstr(lineBuffer, " at " ) < (lineBuffer + lengthLine)) &&
                 strstr(lineBuffer, " line ") &&
                 (strstr(lineBuffer, " line ") < (lineBuffer + lengthLine)) &&
                 (strstr(lineBuffer, " at " ) < (strstr(lineBuffer, " line ")))) {
            // perl error message
            return SCE_ERR_PERL;
      } else if ((memcmp(lineBuffer, "   at ", 6) == 0) &&
                 strstr(lineBuffer, ":line ")) {
            // A .NET traceback
            return SCE_ERR_NET;
      } else if (strstart(lineBuffer, "Line ") &&
                 strstr(lineBuffer, ", file ")) {
            // Essential Lahey Fortran error message
            return SCE_ERR_ELF;
      } else if (strstart(lineBuffer, "line ") &&
                 strstr(lineBuffer, " column ")) {
            // HTML tidy style: line 42 column 1
            return SCE_ERR_TIDY;
      } else if (strstart(lineBuffer, "\tat ") &&
                 strstr(lineBuffer, "(") &&
                 strstr(lineBuffer, ".java:")) {
            // Java stack back trace
            return SCE_ERR_JAVA_STACK;
      } else {
            // Look for one of the following formats:
            // GCC: <filename>:<line>:<message>
            // Microsoft: <filename>(<line>) :<message>
            // Common: <filename>(<line>): warning|error|note|remark|catastrophic|fatal
            // Common: <filename>(<line>) warning|error|note|remark|catastrophic|fatal
            // Microsoft: <filename>(<line>,<column>)<message>
            // CTags: \t<message>
            // Lua 5 traceback: \t<filename>:<line>:<message>
            // Lua 5.1: <exe>: <filename>:<line>:<message>
            bool initialTab = (lineBuffer[0] == '\t');
            bool initialColonPart = false;
            enum { stInitial,
                  stGccStart, stGccDigit, stGcc,
                  stMsStart, stMsDigit, stMsBracket, stMsVc, stMsDigitComma, stMsDotNet,
                  stCtagsStart, stCtagsStartString, stCtagsStringDollar, stCtags,
                  stUnrecognized
            } state = stInitial;
            for (unsigned int i = 0; i < lengthLine; i++) {
                  char ch = lineBuffer[i];
                  char chNext = ' ';
                  if ((i + 1) < lengthLine)
                        chNext = lineBuffer[i + 1];
                  if (state == stInitial) {
                        if (ch == ':') {
                              // May be GCC, or might be Lua 5 (Lua traceback same but with tab prefix)
                              if ((chNext != '\\') && (chNext != '/') && (chNext != ' ')) {
                                    // This check is not completely accurate as may be on
                                    // GTK+ with a file name that includes ':'.
                                    state = stGccStart;
                              } else if (chNext == ' ') { // indicates a Lua 5.1 error message
                                    initialColonPart = true;
                              }
                        } else if ((ch == '(') && Is1To9(chNext) && (!initialTab)) {
                              // May be Microsoft
                              // Check against '0' often removes phone numbers
                              state = stMsStart;
                        } else if ((ch == '\t') && (!initialTab)) {
                              // May be CTags
                              state = stCtagsStart;
                        }
                  } else if (state == stGccStart) {   // <filename>:
                        state = Is1To9(ch) ? stGccDigit : stUnrecognized;
                  } else if (state == stGccDigit) {   // <filename>:<line>
                        if (ch == ':') {
                              state = stGcc;    // :9.*: is GCC
                              startValue = i + 1;
                              break;
                        } else if (!Is0To9(ch)) {
                              state = stUnrecognized;
                        }
                  } else if (state == stMsStart) {    // <filename>(
                        state = Is0To9(ch) ? stMsDigit : stUnrecognized;
                  } else if (state == stMsDigit) {    // <filename>(<line>
                        if (ch == ',') {
                              state = stMsDigitComma;
                        } else if (ch == ')') {
                              state = stMsBracket;
                        } else if ((ch != ' ') && !Is0To9(ch)) {
                              state = stUnrecognized;
                        }
                  } else if (state == stMsBracket) {  // <filename>(<line>)
                        if ((ch == ' ') && (chNext == ':')) {
                              state = stMsVc;
                        } else if ((ch == ':' && chNext == ' ') || (ch == ' ')) {
                              // Possibly Delphi.. don't test against chNext as it's one of the strings below.
                              char word[512];
                              unsigned int j, chPos;
                              unsigned numstep;
                              chPos = 0;
                              if (ch == ' ')
                                    numstep = 1; // ch was ' ', handle as if it's a delphi errorline, only add 1 to i.
                              else
                                    numstep = 2; // otherwise add 2.
                              for (j = i + numstep; j < lengthLine && isalpha(lineBuffer[j]) && chPos < sizeof(word) - 1; j++)
                                    word[chPos++] = lineBuffer[j];
                              word[chPos] = 0;
                              if (!CompareCaseInsensitive(word, "error") || !CompareCaseInsensitive(word, "warning") ||
                                    !CompareCaseInsensitive(word, "fatal") || !CompareCaseInsensitive(word, "catastrophic") ||
                                    !CompareCaseInsensitive(word, "note") || !CompareCaseInsensitive(word, "remark")) {
                                    state = stMsVc;
                              } else
                                    state = stUnrecognized;
                        } else {
                              state = stUnrecognized;
                        }
                  } else if (state == stMsDigitComma) {     // <filename>(<line>,
                        if (ch == ')') {
                              state = stMsDotNet;
                              break;
                        } else if ((ch != ' ') && !Is0To9(ch)) {
                              state = stUnrecognized;
                        }
                  } else if (state == stCtagsStart) {
                        if ((lineBuffer[i - 1] == '\t') &&
                                ((ch == '/' && lineBuffer[i + 1] == '^') || Is0To9(ch))) {
                              state = stCtags;
                              break;
                        } else if ((ch == '/') && (lineBuffer[i + 1] == '^')) {
                              state = stCtagsStartString;
                        }
                  } else if ((state == stCtagsStartString) && ((lineBuffer[i] == '$') && (lineBuffer[i + 1] == '/'))) {
                        state = stCtagsStringDollar;
                        break;
                  }
            }
            if (state == stGcc) {
                  return initialColonPart ? SCE_ERR_LUA : SCE_ERR_GCC;
            } else if ((state == stMsVc) || (state == stMsDotNet)) {
                  return SCE_ERR_MS;
            } else if ((state == stCtagsStringDollar) || (state == stCtags)) {
                  return SCE_ERR_CTAG;
            } else {
                  return SCE_ERR_DEFAULT;
            }
      }
}

static void ColouriseErrorListLine(
    char *lineBuffer,
    unsigned int lengthLine,
    unsigned int endPos,
    Accessor &styler,
      bool valueSeparate) {
      int startValue = -1;
      int style = RecogniseErrorListLine(lineBuffer, lengthLine, startValue);
      if (valueSeparate && (startValue >= 0)) {
            styler.ColourTo(endPos - (lengthLine - startValue), style);
            styler.ColourTo(endPos, SCE_ERR_VALUE);
      } else {
            styler.ColourTo(endPos, style);
      }
}

static void ColouriseErrorListDoc(unsigned int startPos, int length, int, WordList *[], Accessor &styler) {
      char lineBuffer[10000];
      styler.StartAt(startPos);
      styler.StartSegment(startPos);
      unsigned int linePos = 0;

      // property lexer.errorlist.value.separate 
      //    For lines in the output pane that are matches from Find in Files or GCC-style 
      //    diagnostics, style the path and line number separately from the rest of the 
      //    line with style 21 used for the rest of the line. 
      //    This allows matched text to be more easily distinguished from its location. 
      bool valueSeparate = styler.GetPropertyInt("lexer.errorlist.value.separate", 0) != 0;
      for (unsigned int i = startPos; i < startPos + length; i++) {
            lineBuffer[linePos++] = styler[i];
            if (AtEOL(styler, i) || (linePos >= sizeof(lineBuffer) - 1)) {
                  // End of line (or of line buffer) met, colourise it
                  lineBuffer[linePos] = '\0';
                  ColouriseErrorListLine(lineBuffer, linePos, i, styler, valueSeparate);
                  linePos = 0;
            }
      }
      if (linePos > 0) {      // Last line does not have ending characters
            ColouriseErrorListLine(lineBuffer, linePos, startPos + length - 1, styler, valueSeparate);
      }
}

static int isSpecial(char s) {
      return (s == '\\') || (s == ',') || (s == ';') || (s == '\'') || (s == ' ') ||
             (s == '\"') || (s == '`') || (s == '^') || (s == '~');
}

static int isTag(int start, Accessor &styler) {
      char s[6];
      unsigned int i = 0, e = 1;
      while (i < 5 && e) {
            s[i] = styler[start + i];
            i++;
            e = styler[start + i] != '{';
      }
      s[i] = '\0';
      return (strcmp(s, "begin") == 0) || (strcmp(s, "end") == 0);
}

static void ColouriseLatexDoc(unsigned int startPos, int length, int initStyle,
                              WordList *[], Accessor &styler) {

      styler.StartAt(startPos);

      int state = initStyle;
      char chNext = styler[startPos];
      styler.StartSegment(startPos);
      int lengthDoc = startPos + length;

      for (int i = startPos; i < lengthDoc; i++) {
            char ch = chNext;
            chNext = styler.SafeGetCharAt(i + 1);

            if (styler.IsLeadByte(ch)) {
                  chNext = styler.SafeGetCharAt(i + 2);
                  i++;
                  continue;
            }
            switch (state) {
            case SCE_L_DEFAULT :
                  switch (ch) {
                  case '\\' :
                        styler.ColourTo(i - 1, state);
                        if (isSpecial(styler[i + 1])) {
                              styler.ColourTo(i + 1, SCE_L_COMMAND);
                              i++;
                              chNext = styler.SafeGetCharAt(i + 1);
                        } else {
                              if (isTag(i + 1, styler))
                                    state = SCE_L_TAG;
                              else
                                    state = SCE_L_COMMAND;
                        }
                        break;
                  case '$' :
                        styler.ColourTo(i - 1, state);
                        state = SCE_L_MATH;
                        if (chNext == '$') {
                              i++;
                              chNext = styler.SafeGetCharAt(i + 1);
                        }
                        break;
                  case '%' :
                        styler.ColourTo(i - 1, state);
                        state = SCE_L_COMMENT;
                        break;
                  }
                  break;
            case SCE_L_COMMAND :
                  if (chNext == '[' || chNext == '{' || chNext == '}' ||
                          chNext == ' ' || chNext == '\r' || chNext == '\n') {
                        styler.ColourTo(i, state);
                        state = SCE_L_DEFAULT;
                        i++;
                        chNext = styler.SafeGetCharAt(i + 1);
                  }
                  break;
            case SCE_L_TAG :
                  if (ch == '}') {
                        styler.ColourTo(i, state);
                        state = SCE_L_DEFAULT;
                  }
                  break;
            case SCE_L_MATH :
                  if (ch == '$') {
                        if (chNext == '$') {
                              i++;
                              chNext = styler.SafeGetCharAt(i + 1);
                        }
                        styler.ColourTo(i, state);
                        state = SCE_L_DEFAULT;
                  }
                  break;
            case SCE_L_COMMENT :
                  if (ch == '\r' || ch == '\n') {
                        styler.ColourTo(i - 1, state);
                        state = SCE_L_DEFAULT;
                  }
            }
      }
      styler.ColourTo(lengthDoc-1, state);
}

static const char * const batchWordListDesc[] = {
      "Internal Commands",
      "External Commands",
      0
};

static const char * const emptyWordListDesc[] = {
      0
};

static void ColouriseNullDoc(unsigned int startPos, int length, int, WordList *[],
                            Accessor &styler) {
      // Null language means all style bytes are 0 so just mark the end - no need to fill in.
      if (length > 0) {
            styler.StartAt(startPos + length - 1);
            styler.StartSegment(startPos + length - 1);
            styler.ColourTo(startPos + length - 1, 0);
      }
}

LexerModule lmBatch(SCLEX_BATCH, ColouriseBatchDoc, "batch", 0, batchWordListDesc);
LexerModule lmDiff(SCLEX_DIFF, ColouriseDiffDoc, "diff", FoldDiffDoc, emptyWordListDesc);
LexerModule lmPo(SCLEX_PO, ColourisePoDoc, "po", 0, emptyWordListDesc);
LexerModule lmProps(SCLEX_PROPERTIES, ColourisePropsDoc, "props", FoldPropsDoc, emptyWordListDesc);
LexerModule lmMake(SCLEX_MAKEFILE, ColouriseMakeDoc, "makefile", 0, emptyWordListDesc);
LexerModule lmErrorList(SCLEX_ERRORLIST, ColouriseErrorListDoc, "errorlist", 0, emptyWordListDesc);
LexerModule lmLatex(SCLEX_LATEX, ColouriseLatexDoc, "latex", 0, emptyWordListDesc);
LexerModule lmNull(SCLEX_NULL, ColouriseNullDoc, "null");

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