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