Added Lout lexer by Kein-Hong Man.

1 files changed, 208 insertions, 0 deletions

diff --git a/src/LexLout.cxx b/src/LexLout.cxx
new file mode 100644
index 000000000..9d1a45a02
--- /dev/null
+++ b/src/LexLout.cxx
@@ -0,0 +1,208 @@
+// 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);