src/stc/scintilla/lexers/LexPS.cxx

   1 // Scintilla source code edit control
   2 /** @file LexPS.cxx
   3  ** Lexer for PostScript
   4  **
   5  ** Written by Nigel Hathaway <nigel@bprj.co.uk>.
   6  ** The License.txt file describes the conditions under which this software may be distributed.
   7  **/
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <stdio.h>
  12 #include <stdarg.h>
  13 #include <assert.h>
  14 #include <ctype.h>
  15
  16 #include "ILexer.h"
  17 #include "Scintilla.h"
  18 #include "SciLexer.h"
  19
  20 #include "WordList.h"
  21 #include "LexAccessor.h"
  22 #include "Accessor.h"
  23 #include "StyleContext.h"
  24 #include "CharacterSet.h"
  25 #include "LexerModule.h"
  26
  27 #ifdef SCI_NAMESPACE
  28 using namespace Scintilla;
  29 #endif
  30
  31 static inline bool IsASelfDelimitingChar(const int ch) {
  32     return (ch == '[' || ch == ']' || ch == '{' || ch == '}' ||
  33             ch == '/' || ch == '<' || ch == '>' ||
  34             ch == '(' || ch == ')' || ch == '%');
  35 }
  36
  37 static inline bool IsAWhitespaceChar(const int ch) {
  38     return (ch == ' '  || ch == '\t' || ch == '\r' ||
  39             ch == '\n' || ch == '\f' || ch == '\0');
  40 }
  41
  42 static bool IsABaseNDigit(const int ch, const int base) {
  43     int maxdig = '9';
  44     int letterext = -1;
  45
  46     if (base <= 10)
  47         maxdig = '0' + base - 1;
  48     else
  49         letterext = base - 11;
  50
  51     return ((ch >= '0' && ch <= maxdig) ||
  52             (ch >= 'A' && ch <= ('A' + letterext)) ||
  53             (ch >= 'a' && ch <= ('a' + letterext)));
  54 }
  55
  56 static inline bool IsABase85Char(const int ch) {
  57     return ((ch >= '!' && ch <= 'u') || ch == 'z');
  58 }
  59
  60 static void ColourisePSDoc(
  61     unsigned int startPos,
  62     int length,
  63     int initStyle,
  64     WordList *keywordlists[],
  65     Accessor &styler) {
  66
  67     WordList &keywords1 = *keywordlists[0];
  68     WordList &keywords2 = *keywordlists[1];
  69     WordList &keywords3 = *keywordlists[2];
  70     WordList &keywords4 = *keywordlists[3];
  71     WordList &keywords5 = *keywordlists[4];
  72
  73     StyleContext sc(startPos, length, initStyle, styler);
  74
  75     bool tokenizing = styler.GetPropertyInt("ps.tokenize") != 0;
  76     int pslevel = styler.GetPropertyInt("ps.level", 3);
  77     int lineCurrent = styler.GetLine(startPos);
  78     int nestTextCurrent = 0;
  79     if (lineCurrent > 0 && initStyle == SCE_PS_TEXT)
  80         nestTextCurrent = styler.GetLineState(lineCurrent - 1);
  81     int numRadix = 0;
  82     bool numHasPoint = false;
  83     bool numHasExponent = false;
  84     bool numHasSign = false;
  85
  86     // Clear out existing tokenization
  87     if (tokenizing && length > 0) {
  88         styler.StartAt(startPos, static_cast<char>(INDIC2_MASK));
  89         styler.ColourTo(startPos + length-1, 0);
  90         styler.Flush();
  91         styler.StartAt(startPos);
  92         styler.StartSegment(startPos);
  93     }
  94
  95     for (; sc.More(); sc.Forward()) {
  96         if (sc.atLineStart)
  97             lineCurrent = styler.GetLine(sc.currentPos);
  98
  99         // Determine if the current state should terminate.
 100         if (sc.state == SCE_PS_COMMENT || sc.state == SCE_PS_DSC_VALUE) {
 101             if (sc.atLineEnd) {
 102                 sc.SetState(SCE_C_DEFAULT);
 103             }
 104         } else if (sc.state == SCE_PS_DSC_COMMENT) {
 105             if (sc.ch == ':') {
 106                 sc.Forward();
 107                 if (!sc.atLineEnd)
 108                     sc.SetState(SCE_PS_DSC_VALUE);
 109                 else
 110                     sc.SetState(SCE_C_DEFAULT);
 111             } else if (sc.atLineEnd) {
 112                 sc.SetState(SCE_C_DEFAULT);
 113             } else if (IsAWhitespaceChar(sc.ch) && sc.ch != '\r') {
 114                 sc.ChangeState(SCE_PS_COMMENT);
 115             }
 116         } else if (sc.state == SCE_PS_NUMBER) {
 117             if (IsASelfDelimitingChar(sc.ch) || IsAWhitespaceChar(sc.ch)) {
 118                 if ((sc.chPrev == '+' || sc.chPrev == '-' ||
 119                      sc.chPrev == 'E' || sc.chPrev == 'e') && numRadix == 0)
 120                     sc.ChangeState(SCE_PS_NAME);
 121                 sc.SetState(SCE_C_DEFAULT);
 122             } else if (sc.ch == '#') {
 123                 if (numHasPoint || numHasExponent || numHasSign || numRadix != 0) {
 124                     sc.ChangeState(SCE_PS_NAME);
 125                 } else {
 126                     char szradix[5];
 127                     sc.GetCurrent(szradix, 4);
 128                     numRadix = atoi(szradix);
 129                     if (numRadix < 2 || numRadix > 36)
 130                         sc.ChangeState(SCE_PS_NAME);
 131                 }
 132             } else if ((sc.ch == 'E' || sc.ch == 'e') && numRadix == 0) {
 133                 if (numHasExponent) {
 134                     sc.ChangeState(SCE_PS_NAME);
 135                 } else {
 136                     numHasExponent = true;
 137                     if (sc.chNext == '+' || sc.chNext == '-')
 138                         sc.Forward();
 139                 }
 140             } else if (sc.ch == '.') {
 141                 if (numHasPoint || numHasExponent || numRadix != 0) {
 142                     sc.ChangeState(SCE_PS_NAME);
 143                 } else {
 144                     numHasPoint = true;
 145                 }
 146             } else if (numRadix == 0) {
 147                 if (!IsABaseNDigit(sc.ch, 10))
 148                     sc.ChangeState(SCE_PS_NAME);
 149             } else {
 150                 if (!IsABaseNDigit(sc.ch, numRadix))
 151                     sc.ChangeState(SCE_PS_NAME);
 152             }
 153         } else if (sc.state == SCE_PS_NAME || sc.state == SCE_PS_KEYWORD) {
 154             if (IsASelfDelimitingChar(sc.ch) || IsAWhitespaceChar(sc.ch)) {
 155                 char s[100];
 156                 sc.GetCurrent(s, sizeof(s));
 157                 if ((pslevel >= 1 && keywords1.InList(s)) ||
 158                     (pslevel >= 2 && keywords2.InList(s)) ||
 159                     (pslevel >= 3 && keywords3.InList(s)) ||
 160                     keywords4.InList(s) || keywords5.InList(s)) {
 161                     sc.ChangeState(SCE_PS_KEYWORD);
 162                 }
 163                 sc.SetState(SCE_C_DEFAULT);
 164             }
 165         } else if (sc.state == SCE_PS_LITERAL || sc.state == SCE_PS_IMMEVAL) {
 166             if (IsASelfDelimitingChar(sc.ch) || IsAWhitespaceChar(sc.ch))
 167                 sc.SetState(SCE_C_DEFAULT);
 168         } else if (sc.state == SCE_PS_PAREN_ARRAY || sc.state == SCE_PS_PAREN_DICT ||
 169                    sc.state == SCE_PS_PAREN_PROC) {
 170             sc.SetState(SCE_C_DEFAULT);
 171         } else if (sc.state == SCE_PS_TEXT) {
 172             if (sc.ch == '(') {
 173                 nestTextCurrent++;
 174             } else if (sc.ch == ')') {
 175                 if (--nestTextCurrent == 0)
 176                    sc.ForwardSetState(SCE_PS_DEFAULT);
 177             } else if (sc.ch == '\\') {
 178                 sc.Forward();
 179             }
 180         } else if (sc.state == SCE_PS_HEXSTRING) {
 181             if (sc.ch == '>') {
 182                 sc.ForwardSetState(SCE_PS_DEFAULT);
 183             } else if (!IsABaseNDigit(sc.ch, 16) && !IsAWhitespaceChar(sc.ch)) {
 184                 sc.SetState(SCE_PS_HEXSTRING);
 185                 styler.ColourTo(sc.currentPos, SCE_PS_BADSTRINGCHAR);
 186             }
 187         } else if (sc.state == SCE_PS_BASE85STRING) {
 188             if (sc.Match('~', '>')) {
 189                 sc.Forward();
 190                 sc.ForwardSetState(SCE_PS_DEFAULT);
 191             } else if (!IsABase85Char(sc.ch) && !IsAWhitespaceChar(sc.ch)) {
 192                 sc.SetState(SCE_PS_BASE85STRING);
 193                 styler.ColourTo(sc.currentPos, SCE_PS_BADSTRINGCHAR);
 194             }
 195         }
 196
 197         // Determine if a new state should be entered.
 198         if (sc.state == SCE_C_DEFAULT) {
 199             unsigned int tokenpos = sc.currentPos;
 200
 201             if (sc.ch == '[' || sc.ch == ']') {
 202                 sc.SetState(SCE_PS_PAREN_ARRAY);
 203             } else if (sc.ch == '{' || sc.ch == '}') {
 204                 sc.SetState(SCE_PS_PAREN_PROC);
 205             } else if (sc.ch == '/') {
 206                 if (sc.chNext == '/') {
 207                     sc.SetState(SCE_PS_IMMEVAL);
 208                     sc.Forward();
 209                 } else {
 210                     sc.SetState(SCE_PS_LITERAL);
 211                 }
 212             } else if (sc.ch == '<') {
 213                 if (sc.chNext == '<') {
 214                     sc.SetState(SCE_PS_PAREN_DICT);
 215                     sc.Forward();
 216                 } else if (sc.chNext == '~') {
 217                     sc.SetState(SCE_PS_BASE85STRING);
 218                     sc.Forward();
 219                 } else {
 220                     sc.SetState(SCE_PS_HEXSTRING);
 221                 }
 222             } else if (sc.ch == '>' && sc.chNext == '>') {
 223                     sc.SetState(SCE_PS_PAREN_DICT);
 224                     sc.Forward();
 225             } else if (sc.ch == '>' || sc.ch == ')') {
 226                 sc.SetState(SCE_C_DEFAULT);
 227                 styler.ColourTo(sc.currentPos, SCE_PS_BADSTRINGCHAR);
 228             } else if (sc.ch == '(') {
 229                 sc.SetState(SCE_PS_TEXT);
 230                 nestTextCurrent = 1;
 231             } else if (sc.ch == '%') {
 232                 if (sc.chNext == '%' && sc.atLineStart) {
 233                     sc.SetState(SCE_PS_DSC_COMMENT);
 234                     sc.Forward();
 235                     if (sc.chNext == '+') {
 236                         sc.Forward();
 237                         sc.ForwardSetState(SCE_PS_DSC_VALUE);
 238                     }
 239                 } else {
 240                     sc.SetState(SCE_PS_COMMENT);
 241                 }
 242             } else if ((sc.ch == '+' || sc.ch == '-' || sc.ch == '.') &&
 243                        IsABaseNDigit(sc.chNext, 10)) {
 244                 sc.SetState(SCE_PS_NUMBER);
 245                 numRadix = 0;
 246                 numHasPoint = (sc.ch == '.');
 247                 numHasExponent = false;
 248                 numHasSign = (sc.ch == '+' || sc.ch == '-');
 249             } else if ((sc.ch == '+' || sc.ch == '-') && sc.chNext == '.' &&
 250                        IsABaseNDigit(sc.GetRelative(2), 10)) {
 251                 sc.SetState(SCE_PS_NUMBER);
 252                 numRadix = 0;
 253                 numHasPoint = false;
 254                 numHasExponent = false;
 255                 numHasSign = true;
 256             } else if (IsABaseNDigit(sc.ch, 10)) {
 257                 sc.SetState(SCE_PS_NUMBER);
 258                 numRadix = 0;
 259                 numHasPoint = false;
 260                 numHasExponent = false;
 261                 numHasSign = false;
 262             } else if (!IsAWhitespaceChar(sc.ch)) {
 263                 sc.SetState(SCE_PS_NAME);
 264             }
 265
 266             // Mark the start of tokens
 267             if (tokenizing && sc.state != SCE_C_DEFAULT && sc.state != SCE_PS_COMMENT &&
 268                 sc.state != SCE_PS_DSC_COMMENT && sc.state != SCE_PS_DSC_VALUE) {
 269                 styler.Flush();
 270                 styler.StartAt(tokenpos, static_cast<char>(INDIC2_MASK));
 271                 styler.ColourTo(tokenpos, INDIC2_MASK);
 272                 styler.Flush();
 273                 styler.StartAt(tokenpos);
 274                 styler.StartSegment(tokenpos);
 275             }
 276         }
 277
 278         if (sc.atLineEnd)
 279             styler.SetLineState(lineCurrent, nestTextCurrent);
 280     }
 281
 282     sc.Complete();
 283 }
 284
 285 static void FoldPSDoc(unsigned int startPos, int length, int, WordList *[],
 286                        Accessor &styler) {
 287     bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
 288     bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
 289     unsigned int endPos = startPos + length;
 290     int visibleChars = 0;
 291     int lineCurrent = styler.GetLine(startPos);
 292     int levelCurrent = SC_FOLDLEVELBASE;
 293     if (lineCurrent > 0)
 294         levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
 295     int levelMinCurrent = levelCurrent;
 296     int levelNext = levelCurrent;
 297     char chNext = styler[startPos];
 298     int styleNext = styler.StyleAt(startPos);
 299     int style;
 300     for (unsigned int i = startPos; i < endPos; i++) {
 301         char ch = chNext;
 302         chNext = styler.SafeGetCharAt(i + 1);
 303         style = styleNext;
 304         styleNext = styler.StyleAt(i + 1);
 305         bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');  //mac??
 306         if ((style & 31) == SCE_PS_PAREN_PROC) {
 307             if (ch == '{') {
 308                 // Measure the minimum before a '{' to allow
 309                 // folding on "} {"
 310                 if (levelMinCurrent > levelNext) {
 311                     levelMinCurrent = levelNext;
 312                 }
 313                 levelNext++;
 314             } else if (ch == '}') {
 315                 levelNext--;
 316             }
 317         }
 318         if (atEOL) {
 319             int levelUse = levelCurrent;
 320             if (foldAtElse) {
 321                 levelUse = levelMinCurrent;
 322             }
 323             int lev = levelUse | levelNext << 16;
 324             if (visibleChars == 0 && foldCompact)
 325                 lev |= SC_FOLDLEVELWHITEFLAG;
 326             if (levelUse < levelNext)
 327                 lev |= SC_FOLDLEVELHEADERFLAG;
 328             if (lev != styler.LevelAt(lineCurrent)) {
 329                 styler.SetLevel(lineCurrent, lev);
 330             }
 331             lineCurrent++;
 332             levelCurrent = levelNext;
 333             levelMinCurrent = levelCurrent;
 334             visibleChars = 0;
 335         }
 336         if (!isspacechar(ch))
 337             visibleChars++;
 338     }
 339 }
 340
 341 static const char * const psWordListDesc[] = {
 342     "PS Level 1 operators",
 343     "PS Level 2 operators",
 344     "PS Level 3 operators",
 345     "RIP-specific operators",
 346     "User-defined operators",
 347     0
 348 };
 349
 350 LexerModule lmPS(SCLEX_PS, ColourisePSDoc, "ps", FoldPSDoc, psWordListDesc);