contrib/src/stc/scintilla/src/LexVB.cxx

   1 // Scintilla source code edit control
   2 /** @file LexVB.cxx
   3  ** Lexer for Visual Basic and VBScript.
   4  **/
   5 // Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
   6 // The License.txt file describes the conditions under which this software may be distributed.
   7
   8 #include <stdlib.h>
   9 #include <string.h>
  10 #include <ctype.h>
  11 #include <stdio.h>
  12 #include <stdarg.h>
  13
  14 #include "Platform.h"
  15
  16 #include "PropSet.h"
  17 #include "Accessor.h"
  18 #include "StyleContext.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22
  23 static bool IsVBComment(Accessor &styler, int pos, int len) {
  24         return len>0 && styler[pos]=='\'';
  25 }
  26
  27 static inline bool IsTypeCharacter(int ch) {
  28         return ch == '%' || ch == '&' || ch == '@' || ch == '!' || ch == '#' || ch == '$';
  29 }
  30
  31 // Extended to accept accented characters
  32 static inline bool IsAWordChar(int ch) {
  33         return ch >= 0x80 ||
  34                (isalnum(ch) || ch == '.' || ch == '_');
  35 }
  36
  37 static inline bool IsAWordStart(int ch) {
  38         return ch >= 0x80 ||
  39                (isalnum(ch) || ch == '_');
  40 }
  41
  42 static inline bool IsADateCharacter(const int ch) {
  43         return (ch < 0x80) &&
  44                 (isalnum(ch) || ch == '|' || ch == '-' || ch == '/' || ch == ':' || ch == ' ' || ch == '\t');
  45 }
  46
  47 static void ColouriseVBDoc(unsigned int startPos, int length, int initStyle,
  48                            WordList *keywordlists[], Accessor &styler, bool vbScriptSyntax) {
  49
  50         WordList &keywords = *keywordlists[0];
  51         WordList &keywords2 = *keywordlists[1];
  52         WordList &keywords3 = *keywordlists[2];
  53         WordList &keywords4 = *keywordlists[3];
  54
  55         styler.StartAt(startPos);
  56
  57         int visibleChars = 0;
  58
  59         StyleContext sc(startPos, length, initStyle, styler);
  60
  61         for (; sc.More(); sc.Forward()) {
  62
  63                 if (sc.state == SCE_B_OPERATOR) {
  64                         sc.SetState(SCE_B_DEFAULT);
  65                 } else if (sc.state == SCE_B_IDENTIFIER) {
  66                         if (!IsAWordChar(sc.ch)) {
  67                                 // In Basic (except VBScript), a variable name or a function name
  68                                 // can end with a special character indicating the type of the value
  69                                 // held or returned.
  70                                 bool skipType = false;
  71                                 if (!vbScriptSyntax && IsTypeCharacter(sc.ch)) {
  72                                         sc.Forward();   // Skip it
  73                                         skipType = true;
  74                                 }
  75                                 if (sc.ch == ']') {
  76                                         sc.Forward();
  77                                 }
  78                                 char s[100];
  79                                 sc.GetCurrentLowered(s, sizeof(s));
  80                                 if (skipType) {
  81                                         s[strlen(s) - 1] = '\0';
  82                                 }
  83                                 if (strcmp(s, "rem") == 0) {
  84                                         sc.ChangeState(SCE_B_COMMENT);
  85                                 } else {
  86                                         if (keywords.InList(s)) {
  87                                                 sc.ChangeState(SCE_B_KEYWORD);
  88                                         } else if (keywords2.InList(s)) {
  89                                                 sc.ChangeState(SCE_B_KEYWORD2);
  90                                         } else if (keywords3.InList(s)) {
  91                                                 sc.ChangeState(SCE_B_KEYWORD3);
  92                                         } else if (keywords4.InList(s)) {
  93                                                 sc.ChangeState(SCE_B_KEYWORD4);
  94                                         }       // Else, it is really an identifier...
  95                                         sc.SetState(SCE_B_DEFAULT);
  96                                 }
  97                         }
  98                 } else if (sc.state == SCE_B_NUMBER) {
  99                         if (!IsAWordChar(sc.ch)) {
 100                                 sc.SetState(SCE_B_DEFAULT);
 101                         }
 102                 } else if (sc.state == SCE_B_STRING) {
 103                         // VB doubles quotes to preserve them, so just end this string
 104                         // state now as a following quote will start again
 105                         if (sc.ch == '\"') {
 106                                 if (tolower(sc.chNext) == 'c') {
 107                                         sc.Forward();
 108                                 }
 109                                 sc.ForwardSetState(SCE_B_DEFAULT);
 110                         } else if (sc.atLineEnd) {
 111                                 sc.ChangeState(SCE_B_STRINGEOL);
 112                                 sc.ForwardSetState(SCE_B_DEFAULT);
 113                         }
 114                 } else if (sc.state == SCE_B_COMMENT) {
 115                         if (sc.atLineEnd) {
 116                                 sc.SetState(SCE_B_DEFAULT);
 117                         }
 118                 } else if (sc.state == SCE_B_PREPROCESSOR) {
 119                         if (sc.atLineEnd) {
 120                                 sc.SetState(SCE_B_DEFAULT);
 121                         }
 122                 } else if (sc.state == SCE_B_DATE) {
 123                         if (sc.ch == '#' || !IsADateCharacter(sc.chNext)) {
 124                                 sc.ForwardSetState(SCE_B_DEFAULT);
 125                         }
 126                 }
 127
 128                 if (sc.state == SCE_B_DEFAULT) {
 129                         if (sc.ch == '\'') {
 130                                 sc.SetState(SCE_B_COMMENT);
 131                         } else if (sc.ch == '\"') {
 132                                 sc.SetState(SCE_B_STRING);
 133                         } else if (sc.ch == '#' && visibleChars == 0) {
 134                                 // Preprocessor commands are alone on their line
 135                                 sc.SetState(SCE_B_PREPROCESSOR);
 136                         } else if (sc.ch == '#') {
 137                                 int n = 1;
 138                                 int chSeek = ' ';
 139                                 while ((n < 100) && (chSeek == ' ' || chSeek == '\t')) {
 140                                         chSeek = sc.GetRelative(n);
 141                                         n++;
 142                                 }
 143                                 if (IsADigit(chSeek)) {
 144                                         sc.SetState(SCE_B_DATE);
 145                                 } else {
 146                                         sc.SetState(SCE_B_OPERATOR);
 147                                 }
 148                         } else if (sc.ch == '&' && tolower(sc.chNext) == 'h') {
 149                                 sc.SetState(SCE_B_NUMBER);
 150                         } else if (sc.ch == '&' && tolower(sc.chNext) == 'o') {
 151                                 sc.SetState(SCE_B_NUMBER);
 152                         } else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
 153                                 sc.SetState(SCE_B_NUMBER);
 154                         } else if (IsAWordStart(sc.ch) || (sc.ch == '[')) {
 155                                 sc.SetState(SCE_B_IDENTIFIER);
 156                         } else if (isoperator(static_cast<char>(sc.ch)) || (sc.ch == '\\')) {
 157                                 sc.SetState(SCE_B_OPERATOR);
 158                         }
 159                 }
 160
 161                 if (sc.atLineEnd) {
 162                         visibleChars = 0;
 163                 }
 164                 if (!IsASpace(sc.ch)) {
 165                         visibleChars++;
 166                 }
 167         }
 168         sc.Complete();
 169 }
 170
 171 static void FoldVBDoc(unsigned int startPos, int length, int,
 172                                                    WordList *[], Accessor &styler) {
 173         int endPos = startPos + length;
 174
 175         // Backtrack to previous line in case need to fix its fold status
 176         int lineCurrent = styler.GetLine(startPos);
 177         if (startPos > 0) {
 178                 if (lineCurrent > 0) {
 179                         lineCurrent--;
 180                         startPos = styler.LineStart(lineCurrent);
 181                 }
 182         }
 183         int spaceFlags = 0;
 184         int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, IsVBComment);
 185         char chNext = styler[startPos];
 186         for (int i = startPos; i < endPos; i++) {
 187                 char ch = chNext;
 188                 chNext = styler.SafeGetCharAt(i + 1);
 189
 190                 if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == endPos)) {
 191                         int lev = indentCurrent;
 192                         int indentNext = styler.IndentAmount(lineCurrent + 1, &spaceFlags, IsVBComment);
 193                         if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
 194                                 // Only non whitespace lines can be headers
 195                                 if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK)) {
 196                                         lev |= SC_FOLDLEVELHEADERFLAG;
 197                                 } else if (indentNext & SC_FOLDLEVELWHITEFLAG) {
 198                                         // Line after is blank so check the next - maybe should continue further?
 199                                         int spaceFlags2 = 0;
 200                                         int indentNext2 = styler.IndentAmount(lineCurrent + 2, &spaceFlags2, IsVBComment);
 201                                         if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext2 & SC_FOLDLEVELNUMBERMASK)) {
 202                                                 lev |= SC_FOLDLEVELHEADERFLAG;
 203                                         }
 204                                 }
 205                         }
 206                         indentCurrent = indentNext;
 207                         styler.SetLevel(lineCurrent, lev);
 208                         lineCurrent++;
 209                 }
 210         }
 211 }
 212
 213 static void ColouriseVBNetDoc(unsigned int startPos, int length, int initStyle,
 214                            WordList *keywordlists[], Accessor &styler) {
 215         ColouriseVBDoc(startPos, length, initStyle, keywordlists, styler, false);
 216 }
 217
 218 static void ColouriseVBScriptDoc(unsigned int startPos, int length, int initStyle,
 219                            WordList *keywordlists[], Accessor &styler) {
 220         ColouriseVBDoc(startPos, length, initStyle, keywordlists, styler, true);
 221 }
 222
 223 static const char * const vbWordListDesc[] = {
 224         "Keywords",
 225         "user1",
 226         "user2",
 227         "user3",
 228         0
 229 };
 230
 231 LexerModule lmVB(SCLEX_VB, ColouriseVBNetDoc, "vb", FoldVBDoc, vbWordListDesc);
 232 LexerModule lmVBScript(SCLEX_VBSCRIPT, ColouriseVBScriptDoc, "vbscript", FoldVBDoc, vbWordListDesc);
 233