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LexVB.cxx

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// Scintilla source code edit control
/** @file LexVB.cxx
 ** Lexer for Visual Basic and VBScript.
 **/
// 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 "PropSet.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"

static bool IsVBComment(Accessor &styler, int pos, int len) {
      return len>0 && styler[pos]=='\'';
}

static inline bool IsTypeCharacter(const int ch) {
      return ch == '%' || ch == '&' || ch == '@' || ch == '!' || ch == '#' || ch == '$';
}

static inline bool IsAWordChar(const int ch) {
      return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
}

static inline bool IsAWordStart(const int ch) {
      return (ch < 0x80) && (isalnum(ch) || ch == '_');
}

static inline bool IsADateCharacter(const int ch) {
      return (ch < 0x80) &&
            (isalnum(ch) || ch == '|' || ch == '-' || ch == '/' || ch == ':' || ch == ' ' || ch == '\t');
}

static void ColouriseVBDoc(unsigned int startPos, int length, int initStyle,
                           WordList *keywordlists[], Accessor &styler, bool vbScriptSyntax) {

      WordList &keywords = *keywordlists[0];

      styler.StartAt(startPos);

      int visibleChars = 0;

      StyleContext sc(startPos, length, initStyle, styler);

      for (; sc.More(); sc.Forward()) {

            if (sc.state == SCE_B_OPERATOR) {
                  sc.SetState(SCE_B_DEFAULT);
            } else if (sc.state == SCE_B_KEYWORD) {
                  if (!IsAWordChar(sc.ch)) {
                        if (vbScriptSyntax || !IsTypeCharacter(sc.ch)) {
                              if (sc.ch == ']')
                                    sc.Forward();
                              char s[100];
                              sc.GetCurrentLowered(s, sizeof(s));
                              if (keywords.InList(s)) {
                                    if (strcmp(s, "rem") == 0) {
                                          sc.ChangeState(SCE_B_COMMENT);
                                          if (sc.atLineEnd) {
                                                sc.SetState(SCE_B_DEFAULT);
                                          }
                                    } else {
                                          sc.SetState(SCE_B_DEFAULT);
                                    }
                              } else {
                                    sc.ChangeState(SCE_B_IDENTIFIER);
                                    sc.SetState(SCE_B_DEFAULT);
                              }
                        }
                  }
            } else if (sc.state == SCE_B_NUMBER) {
                  if (!IsAWordChar(sc.ch)) {
                        sc.SetState(SCE_B_DEFAULT);
                  }
            } else if (sc.state == SCE_B_STRING) {
                  // VB doubles quotes to preserve them, so just end this string
                  // state now as a following quote will start again
                  if (sc.ch == '\"') {
                        if (tolower(sc.chNext) == 'c') {
                              sc.Forward();
                        }
                        sc.ForwardSetState(SCE_B_DEFAULT);
                  }
            } else if (sc.state == SCE_B_COMMENT) {
                  if (sc.atLineEnd) {
                        sc.SetState(SCE_B_DEFAULT);
                  }
            } else if (sc.state == SCE_B_PREPROCESSOR) {
                  if (sc.atLineEnd) {
                        sc.SetState(SCE_B_DEFAULT);
                  }
            } else if (sc.state == SCE_B_DATE) {
                  if (sc.ch == '#' || !IsADateCharacter(sc.chNext)) {
                        sc.ForwardSetState(SCE_B_DEFAULT);
                  }
            }

            if (sc.state == SCE_B_DEFAULT) {
                  if (sc.ch == '\'') {
                        sc.SetState(SCE_B_COMMENT);
                  } else if (sc.ch == '\"') {
                        sc.SetState(SCE_B_STRING);
                  } else if (sc.ch == '#' && visibleChars == 0) {
                        // Preprocessor commands are alone on their line
                        sc.SetState(SCE_B_PREPROCESSOR);
                  } else if (sc.ch == '#') {
                        int n = 1;
                        int chSeek = ' ';
                        while ((n < 100) && (chSeek == ' ' || chSeek == '\t')) {
                              chSeek = sc.GetRelative(n);
                              n++;
                        }
                        if (IsADigit(chSeek)) {
                              sc.SetState(SCE_B_DATE);
                        } else {
                              sc.SetState(SCE_B_OPERATOR);
                        }
                  } else if (sc.ch == '&' && tolower(sc.chNext) == 'h') {
                        sc.SetState(SCE_B_NUMBER);
                  } else if (sc.ch == '&' && tolower(sc.chNext) == 'o') {
                        sc.SetState(SCE_B_NUMBER);
                  } else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
                        sc.SetState(SCE_B_NUMBER);
                  } else if (IsAWordStart(sc.ch) || (sc.ch == '[')) {
                        sc.SetState(SCE_B_KEYWORD);
                  } else if (isoperator(static_cast<char>(sc.ch)) || (sc.ch == '\\')) {
                        sc.SetState(SCE_B_OPERATOR);
                  }
            }

            if (sc.atLineEnd) {
                  visibleChars = 0;
            }
            if (!IsASpace(sc.ch)) {
                  visibleChars++;
            }
      }
      sc.Complete();
}

static void FoldVBDoc(unsigned int startPos, int length, int,
                                       WordList *[], Accessor &styler) {
      int endPos = startPos + length;

      // Backtrack to previous line in case need to fix its fold status
      int lineCurrent = styler.GetLine(startPos);
      if (startPos > 0) {
            if (lineCurrent > 0) {
                  lineCurrent--;
                  startPos = styler.LineStart(lineCurrent);
            }
      }
      int spaceFlags = 0;
      int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, IsVBComment);
      char chNext = styler[startPos];
      for (int i = startPos; i < endPos; i++) {
            char ch = chNext;
            chNext = styler.SafeGetCharAt(i + 1);

            if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == endPos)) {
                  int lev = indentCurrent;
                  int indentNext = styler.IndentAmount(lineCurrent + 1, &spaceFlags, IsVBComment);
                  if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
                        // Only non whitespace lines can be headers
                        if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK)) {
                              lev |= SC_FOLDLEVELHEADERFLAG;
                        } else if (indentNext & SC_FOLDLEVELWHITEFLAG) {
                              // Line after is blank so check the next - maybe should continue further?
                              int spaceFlags2 = 0;
                              int indentNext2 = styler.IndentAmount(lineCurrent + 2, &spaceFlags2, IsVBComment);
                              if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext2 & SC_FOLDLEVELNUMBERMASK)) {
                                    lev |= SC_FOLDLEVELHEADERFLAG;
                              }
                        }
                  }
                  indentCurrent = indentNext;
                  styler.SetLevel(lineCurrent, lev);
                  lineCurrent++;
            }
      }
}

static void ColouriseVBNetDoc(unsigned int startPos, int length, int initStyle,
                           WordList *keywordlists[], Accessor &styler) {
      ColouriseVBDoc(startPos, length, initStyle, keywordlists, styler, false);
}

static void ColouriseVBScriptDoc(unsigned int startPos, int length, int initStyle,
                           WordList *keywordlists[], Accessor &styler) {
      ColouriseVBDoc(startPos, length, initStyle, keywordlists, styler, true);
}

static const char * const vbWordListDesc[] = {
      "Keywords",
      0
};

LexerModule lmVB(SCLEX_VB, ColouriseVBNetDoc, "vb", FoldVBDoc, vbWordListDesc);
LexerModule lmVBScript(SCLEX_VBSCRIPT, ColouriseVBScriptDoc, "vbscript", FoldVBDoc, vbWordListDesc);


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