src/stc/scintilla/src/LexPascal.cxx

   1 // Scintilla source code edit control
   2 /** @file LexPascal.cxx
   3  ** Lexer for Pascal.
   4  ** Written by Laurent le Tynevez
   5  ** Updated by Simon Steele <s.steele@pnotepad.org> September 2002
   6  ** Updated by Mathias Rauen <scite@madshi.net> May 2003 (Delphi adjustments)
   7  **/
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <ctype.h>
  12 #include <stdio.h>
  13 #include <stdarg.h>
  14
  15 #include "Platform.h"
  16
  17 #include "PropSet.h"
  18 #include "Accessor.h"
  19 #include "KeyWords.h"
  20 #include "Scintilla.h"
  21 #include "SciLexer.h"
  22 #include "StyleContext.h"
  23
  24 #ifdef SCI_NAMESPACE
  25 using namespace Scintilla;
  26 #endif
  27
  28 static void getRange(unsigned int start,
  29                 unsigned int end,
  30                 Accessor &styler,
  31                 char *s,
  32                 unsigned int len) {
  33         unsigned int i = 0;
  34         while ((i < end - start + 1) && (i < len-1)) {
  35                 s[i] = static_cast<char>(tolower(styler[start + i]));
  36                 i++;
  37         }
  38         s[i] = '\0';
  39 }
  40
  41 static bool IsStreamCommentStyle(int style) {
  42         return style == SCE_C_COMMENT ||
  43                 style == SCE_C_COMMENTDOC ||
  44                 style == SCE_C_COMMENTDOCKEYWORD ||
  45                 style == SCE_C_COMMENTDOCKEYWORDERROR;
  46 }
  47
  48 static void ColourTo(Accessor &styler, unsigned int end, unsigned int attr, bool bInAsm) {
  49         if ((bInAsm) && (attr == SCE_C_OPERATOR || attr == SCE_C_NUMBER || attr == SCE_C_DEFAULT || attr == SCE_C_WORD || attr == SCE_C_IDENTIFIER)) {
  50                 styler.ColourTo(end, SCE_C_REGEX);
  51         } else
  52                 styler.ColourTo(end, attr);
  53 }
  54
  55 // returns 1 if the item starts a class definition, and -1 if the word is "end", and 2 if the word is "asm"
  56 static int classifyWordPascal(unsigned int start, unsigned int end, /*WordList &keywords*/WordList *keywordlists[], Accessor &styler, bool bInClass, bool bInAsm) {
  57         int ret = 0;
  58
  59         WordList& keywords = *keywordlists[0];
  60         WordList& classwords = *keywordlists[1];
  61
  62         char s[100];
  63         getRange(start, end, styler, s, sizeof(s));
  64
  65         char chAttr = SCE_C_IDENTIFIER;
  66         if (isdigit(s[0]) || (s[0] == '.') ||(s[0] == '$')) {
  67                 chAttr = SCE_C_NUMBER;
  68         }
  69         else {
  70                 if (s[0] == '#') {
  71                         chAttr = SCE_C_CHARACTER;
  72                 }
  73                 else {
  74                         if (keywords.InList(s)) {
  75                                 chAttr = SCE_C_WORD;
  76
  77                                 if(strcmp(s, "class") == 0) {
  78                                         ret = 1;
  79                                 }
  80                                 else if (strcmp(s, "asm") == 0) {
  81                                         ret = 2;
  82                                 }
  83                                 else if (strcmp(s, "end") == 0) {
  84                                         ret = -1;
  85                                 }
  86                         } else if (bInClass) {
  87                                 if (classwords.InList(s)) {
  88                                         chAttr = SCE_C_WORD;
  89                                 }
  90                         }
  91                 }
  92         }
  93         ColourTo(styler, end, chAttr, (bInAsm && ret != -1));
  94         return ret;
  95 }
  96
  97 static int classifyFoldPointPascal(const char* s) {
  98         int lev = 0;
  99         if (!(isdigit(s[0]) || (s[0] == '.'))) {
 100                 if (strcmp(s, "begin") == 0 ||
 101                         strcmp(s, "object") == 0 ||
 102                         strcmp(s, "case") == 0 ||
 103                         strcmp(s, "class") == 0 ||
 104                         strcmp(s, "record") == 0 ||
 105                         strcmp(s, "try") == 0) {
 106                         lev=1;
 107                 } else if (strcmp(s, "end") == 0) {
 108                         lev=-1;
 109                 }
 110         }
 111         return lev;
 112 }
 113
 114 static void ColourisePascalDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
 115         Accessor &styler) {
 116
 117         styler.StartAt(startPos);
 118
 119         int state = initStyle;
 120         if (state == SCE_C_CHARACTER)   // Does not leak onto next line
 121                 state = SCE_C_DEFAULT;
 122         char chPrev = ' ';
 123         char chNext = styler[startPos];
 124         unsigned int lengthDoc = startPos + length;
 125
 126         bool bInClassDefinition;
 127
 128         int currentLine = styler.GetLine(startPos);
 129         if (currentLine > 0) {
 130                 styler.SetLineState(currentLine, styler.GetLineState(currentLine-1));
 131                 bInClassDefinition = (styler.GetLineState(currentLine) == 1);
 132         } else {
 133                 styler.SetLineState(currentLine, 0);
 134                 bInClassDefinition = false;
 135         }
 136
 137         bool bInAsm = (state == SCE_C_REGEX);
 138         if (bInAsm)
 139                 state = SCE_C_DEFAULT;
 140
 141         styler.StartSegment(startPos);
 142         for (unsigned int i = startPos; i < lengthDoc; i++) {
 143                 char ch = chNext;
 144
 145                 chNext = styler.SafeGetCharAt(i + 1);
 146
 147                 if ((ch == '\r' && chNext != '\n') || (ch == '\n')) {
 148                         // Trigger on CR only (Mac style) or either on LF from CR+LF (Dos/Win) or on LF alone (Unix)
 149                         // Avoid triggering two times on Dos/Win
 150                         // End of line
 151                         if (state == SCE_C_CHARACTER) {
 152                                 ColourTo(styler, i, state, bInAsm);
 153                                 state = SCE_C_DEFAULT;
 154                         }
 155                         currentLine++;
 156                         styler.SetLineState(currentLine, (bInClassDefinition ? 1 : 0));
 157                 }
 158
 159                 if (styler.IsLeadByte(ch)) {
 160                         chNext = styler.SafeGetCharAt(i + 2);
 161                         chPrev = ' ';
 162                         i += 1;
 163                         continue;
 164                 }
 165
 166                 if (state == SCE_C_DEFAULT) {
 167                         if (iswordstart(ch) || ch == '#' || ch == '$' || (ch == '@' && bInAsm)) {
 168                                 ColourTo(styler, i-1, state, bInAsm);
 169                                 state = SCE_C_IDENTIFIER;
 170                         } else if (ch == '{' && chNext != '$' && chNext != '&') {
 171                                 ColourTo(styler, i-1, state, bInAsm);
 172                                 state = SCE_C_COMMENT;
 173                         } else if (ch == '(' && chNext == '*'
 174                                                 && styler.SafeGetCharAt(i + 2) != '$'
 175                                                 && styler.SafeGetCharAt(i + 2) != '&') {
 176                                 ColourTo(styler, i-1, state, bInAsm);
 177                                 state = SCE_C_COMMENTDOC;
 178                         } else if (ch == '/' && chNext == '/') {
 179                                 ColourTo(styler, i-1, state, bInAsm);
 180                                 state = SCE_C_COMMENTLINE;
 181                         } else if (ch == '\'') {
 182                                 ColourTo(styler, i-1, state, bInAsm);
 183                                 state = SCE_C_CHARACTER;
 184                         } else if (ch == '{' && (chNext == '$' || chNext=='&')) {
 185                                 ColourTo(styler, i-1, state, bInAsm);
 186                                 state = SCE_C_PREPROCESSOR;
 187                         } else if (isoperator(ch)) {
 188                                 ColourTo(styler, i-1, state, bInAsm);
 189                                 ColourTo(styler, i, SCE_C_OPERATOR, bInAsm);
 190
 191                         }
 192                 } else if (state == SCE_C_IDENTIFIER) {
 193                         bool bDoublePoint = ((ch == '.') && (chPrev == '.'));
 194                         if ((!iswordchar(ch) && ch != '$' && ch != '#' && (ch != '@' || !bInAsm)) || bDoublePoint) {
 195                                 if (bDoublePoint) i--;
 196                                 int lStateChange = classifyWordPascal(styler.GetStartSegment(), i - 1, keywordlists, styler, bInClassDefinition, bInAsm);
 197
 198                                 if(lStateChange == 1) {
 199                                         styler.SetLineState(currentLine, 1);
 200                                         bInClassDefinition = true;
 201                                 } else if(lStateChange == 2) {
 202                                         bInAsm = true;
 203                                 } else if(lStateChange == -1) {
 204                                         styler.SetLineState(currentLine, 0);
 205                                         bInClassDefinition = false;
 206                                         bInAsm = false;
 207                                 }
 208                                 if (bDoublePoint) {
 209                                         i++;
 210                                         ColourTo(styler, i-1, SCE_C_DEFAULT, bInAsm);
 211                                 }
 212
 213                                 state = SCE_C_DEFAULT;
 214                                 chNext = styler.SafeGetCharAt(i + 1);
 215                                 if (ch == '{' && chNext != '$' && chNext != '&') {
 216                                         state = SCE_C_COMMENT;
 217                                 } else if (ch == '(' && chNext == '*'
 218                                                 && styler.SafeGetCharAt(i + 2) != '$'
 219                                                 && styler.SafeGetCharAt(i + 2) != '&') {
 220                                         ColourTo(styler, i-1, state, bInAsm);
 221                                         state = SCE_C_COMMENTDOC;
 222                                 } else if (ch == '/' && chNext == '/') {
 223                                         state = SCE_C_COMMENTLINE;
 224                                 } else if (ch == '\'') {
 225                                         state = SCE_C_CHARACTER;
 226                                 } else if (isoperator(ch)) {
 227                                         ColourTo(styler, i, SCE_C_OPERATOR, bInAsm);
 228                                 }
 229                         }
 230                 } else {
 231                         if (state == SCE_C_PREPROCESSOR) {
 232                                 if (ch=='}'){
 233                                         ColourTo(styler, i, state, bInAsm);
 234                                         state = SCE_C_DEFAULT;
 235                                 } else {
 236                                         if ((ch == '\r' || ch == '\n') && !(chPrev == '\\' || chPrev == '\r')) {
 237                                                 ColourTo(styler, i-1, state, bInAsm);
 238                                                 state = SCE_C_DEFAULT;
 239                                         }
 240                                 }
 241                         } else if (state == SCE_C_COMMENT) {
 242                                 if (ch == '}' ) {
 243                                         ColourTo(styler, i, state, bInAsm);
 244                                         state = SCE_C_DEFAULT;
 245                                 }
 246                         } else if (state == SCE_C_COMMENTDOC) {
 247                                 if (ch == ')' && chPrev == '*') {
 248                                         if (((i > styler.GetStartSegment() + 2) || (
 249                                                 (initStyle == SCE_C_COMMENTDOC) &&
 250                                                 (styler.GetStartSegment() == static_cast<unsigned int>(startPos))))) {
 251                                                         ColourTo(styler, i, state, bInAsm);
 252                                                         state = SCE_C_DEFAULT;
 253                                         }
 254                                 }
 255                         } else if (state == SCE_C_COMMENTLINE) {
 256                                 if (ch == '\r' || ch == '\n') {
 257                                         ColourTo(styler, i-1, state, bInAsm);
 258                                         state = SCE_C_DEFAULT;
 259                                 }
 260                         } else if (state == SCE_C_CHARACTER) {
 261                                 if (ch == '\'') {
 262                                         ColourTo(styler, i, state, bInAsm);
 263                                         state = SCE_C_DEFAULT;
 264                                 }
 265                         }
 266                 }
 267                 chPrev = ch;
 268         }
 269         ColourTo(styler, lengthDoc - 1, state, bInAsm);
 270 }
 271
 272 static void FoldPascalDoc(unsigned int startPos, int length, int initStyle, WordList *[],
 273                             Accessor &styler) {
 274         bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
 275         bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
 276         bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 277         unsigned int endPos = startPos + length;
 278         int visibleChars = 0;
 279         int lineCurrent = styler.GetLine(startPos);
 280         int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
 281         int levelCurrent = levelPrev;
 282         char chNext = styler[startPos];
 283         int styleNext = styler.StyleAt(startPos);
 284         int style = initStyle;
 285
 286         int lastStart = 0;
 287
 288         for (unsigned int i = startPos; i < endPos; i++) {
 289                 char ch = chNext;
 290                 chNext = styler.SafeGetCharAt(i + 1);
 291                 int stylePrev = style;
 292                 style = styleNext;
 293                 styleNext = styler.StyleAt(i + 1);
 294                 bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
 295
 296                 if (stylePrev != SCE_C_WORD && style == SCE_C_WORD)
 297                 {
 298                         // Store last word start point.
 299                         lastStart = i;
 300                 }
 301
 302                 if (stylePrev == SCE_C_WORD) {
 303                         if(iswordchar(ch) && !iswordchar(chNext)) {
 304                                 char s[100];
 305                                 getRange(lastStart, i, styler, s, sizeof(s));
 306                                 levelCurrent += classifyFoldPointPascal(s);
 307                         }
 308                 }
 309
 310                 if (foldComment && (style == SCE_C_COMMENTLINE)) {
 311                         if ((ch == '/') && (chNext == '/')) {
 312                                 char chNext2 = styler.SafeGetCharAt(i + 2);
 313                                 if (chNext2 == '{') {
 314                                         levelCurrent++;
 315                                 } else if (chNext2 == '}') {
 316                                         levelCurrent--;
 317                                 }
 318                         }
 319                 }
 320
 321                 if (foldPreprocessor && (style == SCE_C_PREPROCESSOR)) {
 322                         if (ch == '{' && chNext == '$') {
 323                                 unsigned int j=i+2; // skip {$
 324                                 while ((j<endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) {
 325                                         j++;
 326                                 }
 327                                 if (styler.Match(j, "region") || styler.Match(j, "if")) {
 328                                         levelCurrent++;
 329                                 } else if (styler.Match(j, "end")) {
 330                                         levelCurrent--;
 331                                 }
 332                         }
 333                 }
 334
 335                 if (foldComment && IsStreamCommentStyle(style)) {
 336                         if (!IsStreamCommentStyle(stylePrev)) {
 337                                 levelCurrent++;
 338                         } else if (!IsStreamCommentStyle(styleNext) && !atEOL) {
 339                                 // Comments don't end at end of line and the next character may be unstyled.
 340                                 levelCurrent--;
 341                         }
 342                 }
 343
 344                 if (atEOL) {
 345                         int lev = levelPrev;
 346                         if (visibleChars == 0 && foldCompact)
 347                                 lev |= SC_FOLDLEVELWHITEFLAG;
 348                         if ((levelCurrent > levelPrev) && (visibleChars > 0))
 349                                 lev |= SC_FOLDLEVELHEADERFLAG;
 350                         if (lev != styler.LevelAt(lineCurrent)) {
 351                                 styler.SetLevel(lineCurrent, lev);
 352                         }
 353                         lineCurrent++;
 354                         levelPrev = levelCurrent;
 355                         visibleChars = 0;
 356                 }
 357
 358                 if (!isspacechar(ch))
 359                         visibleChars++;
 360         }
 361
 362         // Fill in the real level of the next line, keeping the current flags as they will be filled in later
 363         int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
 364         styler.SetLevel(lineCurrent, levelPrev | flagsNext);
 365 }
 366
 367 static const char * const pascalWordListDesc[] = {
 368         "Keywords",
 369         "Classwords",
 370         0
 371 };
 372
 373 LexerModule lmPascal(SCLEX_PASCAL, ColourisePascalDoc, "pascal", FoldPascalDoc, pascalWordListDesc);