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LexLout.cxx

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// Scintilla source code edit control
/** @file LexLout.cxx
 ** Lexer for the Basser Lout (>= version 3) typesetting language
 **/
// Copyright 2003 by Kein-Hong Man <mkh@pl.jaring.my>
// 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 inline bool IsAWordChar(const int ch) {
      return (ch < 0x80) && (isalpha(ch) || ch == '@' || ch == '_');
}

static inline bool IsAnOther(const int ch) {
      return (ch < 0x80) && (ch == '{' || ch == '}' ||
      ch == '!' || ch == '$' || ch == '%' || ch == '&' || ch == '\'' ||
      ch == '(' || ch == ')' || ch == '*' || ch == '+' || ch == ',' ||
      ch == '-' || ch == '.' || ch == '/' || ch == ':' || ch == ';' ||
      ch == '<' || ch == '=' || ch == '>' || ch == '?' || ch == '[' ||
      ch == ']' || ch == '^' || ch == '`' || ch == '|' || ch == '~');
}

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

      WordList &keywords = *keywordlists[0];
      WordList &keywords2 = *keywordlists[1];
      WordList &keywords3 = *keywordlists[2];

      int visibleChars = 0;
      int firstWordInLine = 0;
      int leadingAtSign = 0;

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

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

            if (sc.atLineStart && (sc.state == SCE_LOUT_STRING)) {
                  // Prevent SCE_LOUT_STRINGEOL from leaking back to previous line
                  sc.SetState(SCE_LOUT_STRING);
            }

            // Determine if the current state should terminate.
            if (sc.state == SCE_LOUT_COMMENT) {
                  if (sc.atLineEnd) {
                        sc.SetState(SCE_LOUT_DEFAULT);
                        visibleChars = 0;
                  }
            } else if (sc.state == SCE_LOUT_NUMBER) {
                  if (!IsADigit(sc.ch) && sc.ch != '.') {
                        sc.SetState(SCE_LOUT_DEFAULT);
                  }
            } else if (sc.state == SCE_LOUT_STRING) {
                  if (sc.ch == '\\') {
                        if (sc.chNext == '\"' || sc.chNext == '\\') {
                              sc.Forward();
                        }
                  } else if (sc.ch == '\"') {
                        sc.ForwardSetState(SCE_LOUT_DEFAULT);
                  } else if (sc.atLineEnd) {
                        sc.ChangeState(SCE_LOUT_STRINGEOL);
                        sc.ForwardSetState(SCE_LOUT_DEFAULT);
                        visibleChars = 0;
                  }
            } else if (sc.state == SCE_LOUT_IDENTIFIER) {
                  if (!IsAWordChar(sc.ch)) {
                        char s[100];
                        sc.GetCurrent(s, sizeof(s));

                        if (leadingAtSign) {
                              if (keywords.InList(s)) {
                                    sc.ChangeState(SCE_LOUT_WORD);
                              } else {
                                    sc.ChangeState(SCE_LOUT_WORD4);
                              }
                        } else if (firstWordInLine && keywords3.InList(s)) {
                              sc.ChangeState(SCE_LOUT_WORD3);
                        }
                        sc.SetState(SCE_LOUT_DEFAULT);
                  }
            } else if (sc.state == SCE_LOUT_OPERATOR) {
                  if (!IsAnOther(sc.ch)) {
                        char s[100];
                        sc.GetCurrent(s, sizeof(s));

                        if (keywords2.InList(s)) {
                              sc.ChangeState(SCE_LOUT_WORD2);
                        }
                        sc.SetState(SCE_LOUT_DEFAULT);
                  }
            }

            // Determine if a new state should be entered.
            if (sc.state == SCE_LOUT_DEFAULT) {
                  if (sc.ch == '#') {
                        sc.SetState(SCE_LOUT_COMMENT);
                  } else if (sc.ch == '\"') {
                        sc.SetState(SCE_LOUT_STRING);
                  } else if (IsADigit(sc.ch) ||
                          (sc.ch == '.' && IsADigit(sc.chNext))) {
                        sc.SetState(SCE_LOUT_NUMBER);
                  } else if (IsAWordChar(sc.ch)) {
                        firstWordInLine = (visibleChars == 0);
                        leadingAtSign = (sc.ch == '@');
                        sc.SetState(SCE_LOUT_IDENTIFIER);
                  } else if (IsAnOther(sc.ch)) {
                        sc.SetState(SCE_LOUT_OPERATOR);
                  }
            }

            if (sc.atLineEnd) {
                  // Reset states to begining of colourise so no surprises
                  // if different sets of lines lexed.
                  visibleChars = 0;
            }
            if (!IsASpace(sc.ch)) {
                  visibleChars++;
            }
      }
      sc.Complete();
}

static void FoldLoutDoc(unsigned int startPos, int length, int, WordList *[],
                        Accessor &styler) {

      unsigned int endPos = startPos + length;
      int visibleChars = 0;
      int lineCurrent = styler.GetLine(startPos);
      int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
      int levelCurrent = levelPrev;
      char chNext = styler[startPos];
      bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
      int styleNext = styler.StyleAt(startPos);
      char s[10];

      for (unsigned int i = startPos; i < endPos; i++) {
            char ch = chNext;
            chNext = styler.SafeGetCharAt(i + 1);
            int style = styleNext;
            styleNext = styler.StyleAt(i + 1);
            bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');

            if (style == SCE_LOUT_WORD) {
                  if (ch == '@') {
                        for (unsigned int j = 0; j < 8; j++) {
                              if (!IsAWordChar(styler[i + j])) {
                                    break;
                              }
                              s[j] = styler[i + j];
                              s[j + 1] = '\0';
                        }
                        if (strcmp(s, "@Begin") == 0) {
                              levelCurrent++;
                        } else if (strcmp(s, "@End") == 0) {
                              levelCurrent--;
                        }
                  }
            } else if (style == SCE_LOUT_OPERATOR) {
                  if (ch == '{') {
                        levelCurrent++;
                  } else if (ch == '}') {
                        levelCurrent--;
                  }
            }
            if (atEOL) {
                  int lev = levelPrev;
                  if (visibleChars == 0 && foldCompact) {
                        lev |= SC_FOLDLEVELWHITEFLAG;
                  }
                  if ((levelCurrent > levelPrev) && (visibleChars > 0)) {
                        lev |= SC_FOLDLEVELHEADERFLAG;
                  }
                  if (lev != styler.LevelAt(lineCurrent)) {
                        styler.SetLevel(lineCurrent, lev);
                  }
                  lineCurrent++;
                  levelPrev = levelCurrent;
                  visibleChars = 0;
            }
            if (!isspacechar(ch))
                  visibleChars++;
      }
      // Fill in the real level of the next line, keeping the current flags as they will be filled in later
      int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
      styler.SetLevel(lineCurrent, levelPrev | flagsNext);
}

static const char * const loutWordLists[] = {
            "Predefined identifiers",
            "Predefined delimiters",
            "Predefined keywords",
            0,
        };

LexerModule lmLout(SCLEX_LOUT, ColouriseLoutDoc, "lout", FoldLoutDoc, loutWordLists);

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