Initial version.

1 files changed, 299 insertions, 0 deletions

diff --git a/src/LexVerilog.cxx b/src/LexVerilog.cxx
new file mode 100644
index 000000000..43ef7eb37
--- /dev/null
+++ b/src/LexVerilog.cxx
@@ -0,0 +1,299 @@
+// Scintilla source code edit control
+/** @file LexVerilog.cxx
+ ** Lexer for Verilog.
+ ** Written by Avi Yegudin, based on C++ lexer by Neil Hodgson
+ **/
+// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
+// 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) && (isalnum(ch) || ch == '.' || ch == '_' || ch == '\'');
+}
+
+static inline bool IsAWordStart(const int ch) {
+	return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '$');
+}
+
+static void ColouriseVerilogDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
+                            Accessor &styler) {
+
+	WordList &keywords = *keywordlists[0];
+	WordList &keywords2 = *keywordlists[1];
+	WordList &keywords3 = *keywordlists[2];
+	WordList &keywords4 = *keywordlists[3];
+
+	// Do not leak onto next line
+	if (initStyle == SCE_V_STRINGEOL)
+		initStyle = SCE_V_DEFAULT;
+
+	StyleContext sc(startPos, length, initStyle, styler);
+
+	for (; sc.More(); sc.Forward()) {
+
+		if (sc.atLineStart && (sc.state == SCE_V_STRING)) {
+			// Prevent SCE_V_STRINGEOL from leaking back to previous line
+			sc.SetState(SCE_V_STRING);
+		}
+
+		// Handle line continuation generically.
+		if (sc.ch == '\\') {
+			if (sc.chNext == '\n' || sc.chNext == '\r') {
+				sc.Forward();
+				if (sc.ch == '\r' && sc.chNext == '\n') {
+					sc.Forward();
+				}
+				continue;
+			}
+		}
+
+		// Determine if the current state should terminate.
+		if (sc.state == SCE_V_OPERATOR) {
+			sc.SetState(SCE_V_DEFAULT);
+		} else if (sc.state == SCE_V_NUMBER) {
+			if (!IsAWordChar(sc.ch)) {
+				sc.SetState(SCE_V_DEFAULT);
+			}
+		} else if (sc.state == SCE_V_IDENTIFIER) {
+			if (!IsAWordChar(sc.ch) || (sc.ch == '.')) {
+				char s[100];
+                                sc.GetCurrent(s, sizeof(s));
+				if (keywords.InList(s)) {
+					sc.ChangeState(SCE_V_WORD);
+				} else if (keywords2.InList(s)) {
+					sc.ChangeState(SCE_V_WORD2);
+				} else if (keywords3.InList(s)) {
+					sc.ChangeState(SCE_V_WORD3);
+                                } else if (keywords4.InList(s)) {
+					sc.ChangeState(SCE_V_USER);
+				}
+				sc.SetState(SCE_V_DEFAULT);
+			}
+		} else if (sc.state == SCE_V_PREPROCESSOR) {
+                        if (!IsAWordChar(sc.ch)) {
+                                sc.SetState(SCE_V_DEFAULT);
+                        }
+		} else if (sc.state == SCE_V_COMMENT) {
+			if (sc.Match('*', '/')) {
+				sc.Forward();
+				sc.ForwardSetState(SCE_V_DEFAULT);
+			}
+		} else if (sc.state == SCE_V_COMMENTLINE || sc.state == SCE_V_COMMENTLINEBANG) {
+			if (sc.atLineEnd) {
+				sc.SetState(SCE_V_DEFAULT);
+			}
+                } else if (sc.state == SCE_V_STRING) {
+			if (sc.ch == '\\') {
+				if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
+					sc.Forward();
+				}
+			} else if (sc.ch == '\"') {
+				sc.ForwardSetState(SCE_V_DEFAULT);
+			} else if (sc.atLineEnd) {
+				sc.ChangeState(SCE_V_STRINGEOL);
+				sc.ForwardSetState(SCE_V_DEFAULT);
+			}
+		}
+
+		// Determine if a new state should be entered.
+		if (sc.state == SCE_V_DEFAULT) {
+			if (IsADigit(sc.ch) || (sc.ch == '\'') || (sc.ch == '.' && IsADigit(sc.chNext))) {
+				sc.SetState(SCE_V_NUMBER);
+			} else if (IsAWordStart(sc.ch)) {
+				sc.SetState(SCE_V_IDENTIFIER);
+			} else if (sc.Match('/', '*')) {
+                                sc.SetState(SCE_V_COMMENT);
+				sc.Forward();	// Eat the * so it isn't used for the end of the comment
+			} else if (sc.Match('/', '/')) {
+				if (sc.Match("//!"))	// Nice to have a different comment style
+					sc.SetState(SCE_V_COMMENTLINEBANG);
+				else
+					sc.SetState(SCE_V_COMMENTLINE);
+			} else if (sc.ch == '\"') {
+				sc.SetState(SCE_V_STRING);
+			} else if (sc.ch == '`') {
+				sc.SetState(SCE_V_PREPROCESSOR);
+				// Skip whitespace between ` and preprocessor word
+				do {
+					sc.Forward();
+				} while ((sc.ch == ' ' || sc.ch == '\t') && sc.More());
+				if (sc.atLineEnd) {
+					sc.SetState(SCE_V_DEFAULT);
+				}
+			} else if (isoperator(static_cast<char>(sc.ch)) || sc.ch == '@' || sc.ch == '#') {
+				sc.SetState(SCE_V_OPERATOR);
+			}
+		}
+	}
+	sc.Complete();
+}
+
+static bool IsStreamCommentStyle(int style) {
+	return style == SCE_V_COMMENT;
+}
+
+// Store both the current line's fold level and the next lines in the
+// level store to make it easy to pick up with each increment
+// and to make it possible to fiddle the current level for "} else {".
+static void FoldNoBoxVerilogDoc(unsigned int startPos, int length, int initStyle,
+                            Accessor &styler) {
+	bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
+	bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 0;
+	bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+	bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
+        // Verilog specific folding options:
+        // fold_at_module -
+        //      Generally used methodology in verilog code is
+        //      one module per file, so folding at module definition is useless.
+        // fold_at_brace/parenthese -
+        //      Folding of long port lists can be convenient. 
+	bool foldAtModule = styler.GetPropertyInt("fold.verilog.flags", 0) != 0;
+	bool foldAtBrace  = 1;
+	bool foldAtParenthese  = 1;
+                                
+	unsigned int endPos = startPos + length;
+	int visibleChars = 0;
+	int lineCurrent = styler.GetLine(startPos);
+	int levelCurrent = SC_FOLDLEVELBASE;
+	if (lineCurrent > 0)
+		levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
+	int levelMinCurrent = levelCurrent;
+	int levelNext = levelCurrent;
+	char chNext = styler[startPos];
+	int styleNext = styler.StyleAt(startPos);
+	int style = initStyle;
+	for (unsigned int i = startPos; i < endPos; i++) {
+		char ch = chNext;
+		chNext = styler.SafeGetCharAt(i + 1);
+		int stylePrev = style;
+		style = styleNext;
+		styleNext = styler.StyleAt(i + 1);
+		bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
+		if (foldComment && IsStreamCommentStyle(style)) {
+			if (!IsStreamCommentStyle(stylePrev)) {
+				levelNext++;
+			} else if (!IsStreamCommentStyle(styleNext) && !atEOL) {
+				// Comments don't end at end of line and the next character may be unstyled.
+				levelNext--;
+			}
+		}
+		if (foldComment && (style == SCE_V_COMMENTLINE)) {
+			if ((ch == '/') && (chNext == '/')) {
+				char chNext2 = styler.SafeGetCharAt(i + 2);
+				if (chNext2 == '{') {
+					levelNext++;
+				} else if (chNext2 == '}') {
+					levelNext--;
+				}
+			}
+		}
+		if (foldPreprocessor && (style == SCE_V_PREPROCESSOR)) {
+			if (ch == '`') {
+				unsigned int j = i + 1;
+				while ((j < endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) {
+					j++;
+				}
+				if (styler.Match(j, "if")) {
+					levelNext++;
+				} else if (styler.Match(j, "end")) {
+					levelNext--;
+				}
+			}
+		}
+                if (style == SCE_V_OPERATOR) {
+                    if (foldAtParenthese) {
+			if (ch == '(') {
+				levelNext++;
+			} else if (ch == ')') {
+				levelNext--;
+			}
+                    }
+		}
+                if (style == SCE_V_OPERATOR) {
+                    if (foldAtBrace) {
+			if (ch == '{') {
+				levelNext++;
+			} else if (ch == '}') {
+				levelNext--;
+			}
+                    }
+		}
+                if (style == SCE_V_WORD && stylePrev != SCE_V_WORD) {
+                        unsigned int j = i;
+                        if (styler.Match(j, "case") || 
+                            styler.Match(j, "casex") || 
+                            styler.Match(j, "casez") || 
+                            styler.Match(j, "function") || 
+                            styler.Match(j, "fork") || 
+                            styler.Match(j, "table") || 
+                            styler.Match(j, "task") || 
+                            styler.Match(j, "specify") || 
+                            styler.Match(j, "primitive") || 
+                            styler.Match(j, "module") && foldAtModule || 
+                            styler.Match(j, "begin")) {
+                                levelNext++;
+                        } else if (styler.Match(j, "endcase") || 
+                                   styler.Match(j, "endfunction") ||
+                                   styler.Match(j, "join") ||
+                                   styler.Match(j, "endtask") ||
+                                   styler.Match(j, "endtable") ||
+                                   styler.Match(j, "endspecify") ||
+                                   styler.Match(j, "endprimitive") ||
+                                   styler.Match(j, "endmodule") && foldAtModule ||
+                                   styler.Match(j, "end") && !IsAWordChar(styler.SafeGetCharAt(j+3))) {
+                                levelNext--;
+                        }
+		}
+		if (atEOL) {
+			int levelUse = levelCurrent;
+			if (foldAtElse) {
+				levelUse = levelMinCurrent;
+			}
+			int lev = levelUse | levelNext << 16;
+			if (visibleChars == 0 && foldCompact)
+				lev |= SC_FOLDLEVELWHITEFLAG;
+			if (levelUse < levelNext)
+				lev |= SC_FOLDLEVELHEADERFLAG;
+			if (lev != styler.LevelAt(lineCurrent)) {
+				styler.SetLevel(lineCurrent, lev);
+			}
+			lineCurrent++;
+			levelCurrent = levelNext;
+			levelMinCurrent = levelCurrent;
+			visibleChars = 0;
+		}
+		if (!isspacechar(ch))
+			visibleChars++;
+	}
+}
+
+static void FoldVerilogDoc(unsigned int startPos, int length, int initStyle, WordList *[],
+                       Accessor &styler) {
+	FoldNoBoxVerilogDoc(startPos, length, initStyle, styler);
+}
+
+static const char * const verilogWordLists[] = {
+            "Primary keywords and identifiers",
+            "Secondary keywords and identifiers",
+            "System Tasks",
+            "User defined tasks and identifiers",
+            "Unused",
+            0,
+        };
+
+
+LexerModule lmVerilog(SCLEX_VERILOG, ColouriseVerilogDoc, "verilog", FoldVerilogDoc, verilogWordLists);