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