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notepad-plus-plus/scintilla/lexers/LexVerilog.cxx
Don Ho 10dc4e06d7 [UPDATE] Update Scintilla to 2.27. 
git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@791 f5eea248-9336-0410-98b8-ebc06183d4e3
2011-07-17 22:30:49 +00:00

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// 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 <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
static inline bool IsAWordChar(const int ch) {
return (ch < 0x80) && (isalnum(ch) || 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.atLineStart) {
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;
}
static bool IsCommentLine(int line, Accessor &styler) {
int pos = styler.LineStart(line);
int eolPos = styler.LineStart(line + 1) - 1;
for (int i = pos; i < eolPos; i++) {
char ch = styler[i];
char chNext = styler.SafeGetCharAt(i + 1);
int style = styler.StyleAt(i);
if (ch == '/' && chNext == '/' &&
(style == SCE_V_COMMENTLINE || style == SCE_V_COMMENTLINEBANG)) {
return true;
} else if (!IsASpaceOrTab(ch)) {
return false;
}
}
return false;
}
// 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 && atEOL && IsCommentLine(lineCurrent, styler))
{
if (!IsCommentLine(lineCurrent - 1, styler)
&& IsCommentLine(lineCurrent + 1, styler))
levelNext++;
else if (IsCommentLine(lineCurrent - 1, styler)
&& !IsCommentLine(lineCurrent+1, styler))
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, "class") ||
styler.Match(j, "function") ||
styler.Match(j, "generate") ||
styler.Match(j, "covergroup") ||
styler.Match(j, "package") ||
styler.Match(j, "primitive") ||
styler.Match(j, "program") ||
styler.Match(j, "sequence") ||
styler.Match(j, "specify") ||
styler.Match(j, "table") ||
styler.Match(j, "task") ||
styler.Match(j, "fork") ||
(styler.Match(j, "module") && foldAtModule) ||
styler.Match(j, "begin")) {
levelNext++;
} else if (styler.Match(j, "endcase") ||
styler.Match(j, "endclass") ||
styler.Match(j, "endfunction") ||
styler.Match(j, "endgenerate") ||
styler.Match(j, "endgroup") ||
styler.Match(j, "endpackage") ||
styler.Match(j, "endprimitive") ||
styler.Match(j, "endprogram") ||
styler.Match(j, "endsequence") ||
styler.Match(j, "endspecify") ||
styler.Match(j, "endtable") ||
styler.Match(j, "endtask") ||
styler.Match(j, "join") ||
styler.Match(j, "join_any") ||
styler.Match(j, "join_none") ||
(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);
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