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ZoneBuilder/Documents/Scintilla/LexCPP.cxx

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// Scintilla source code edit control
/** @file LexCPP.cxx
** Lexer for C++, C, Java, and JavaScript.
**/
// Copyright 1998-2005 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"
#include "CharacterSet.h"
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
static bool IsSpaceEquiv(int state) {
return (state <= SCE_C_COMMENTDOC) ||
// including SCE_C_DEFAULT, SCE_C_COMMENT, SCE_C_COMMENTLINE
(state == SCE_C_COMMENTLINEDOC) || (state == SCE_C_COMMENTDOCKEYWORD) ||
(state == SCE_C_COMMENTDOCKEYWORDERROR);
}
// Preconditions: sc.currentPos points to a character after '+' or '-'.
// The test for pos reaching 0 should be redundant,
// and is in only for safety measures.
// Limitation: this code will give the incorrect answer for code like
// a = b+++/ptn/...
// Putting a space between the '++' post-inc operator and the '+' binary op
// fixes this, and is highly recommended for readability anyway.
static bool FollowsPostfixOperator(StyleContext &sc, Accessor &styler) {
int pos = (int) sc.currentPos;
while (--pos > 0) {
char ch = styler[pos];
if (ch == '+' || ch == '-') {
return styler[pos - 1] == ch;
}
}
return false;
}
static void ColouriseCppDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
Accessor &styler, bool caseSensitive) {
WordList &keywords = *keywordlists[0];
WordList &keywords2 = *keywordlists[1];
WordList &keywords3 = *keywordlists[2];
WordList &keywords4 = *keywordlists[3];
bool stylingWithinPreprocessor = styler.GetPropertyInt("styling.within.preprocessor") != 0;
CharacterSet setOKBeforeRE(CharacterSet::setNone, "([{=,:;!%^&*|?~+-");
CharacterSet setCouldBePostOp(CharacterSet::setNone, "+-");
CharacterSet setDoxygen(CharacterSet::setAlpha, "$@\\&<>#{}[]");
CharacterSet setWordStart(CharacterSet::setAlpha, "_", 0x80, true);
CharacterSet setWord(CharacterSet::setAlphaNum, "._", 0x80, true);
if (styler.GetPropertyInt("lexer.cpp.allow.dollars", 1) != 0) {
setWordStart.Add('$');
setWord.Add('$');
}
int chPrevNonWhite = ' ';
int visibleChars = 0;
bool lastWordWasUUID = false;
int styleBeforeDCKeyword = SCE_C_DEFAULT;
bool continuationLine = false;
if (initStyle == SCE_C_PREPROCESSOR) {
// Set continuationLine if last character of previous line is '\'
int lineCurrent = styler.GetLine(startPos);
if (lineCurrent > 0) {
int chBack = styler.SafeGetCharAt(startPos-1, 0);
int chBack2 = styler.SafeGetCharAt(startPos-2, 0);
int lineEndChar = '!';
if (chBack2 == '\r' && chBack == '\n') {
lineEndChar = styler.SafeGetCharAt(startPos-3, 0);
} else if (chBack == '\n' || chBack == '\r') {
lineEndChar = chBack2;
}
continuationLine = lineEndChar == '\\';
}
}
// look back to set chPrevNonWhite properly for better regex colouring
if (startPos > 0) {
int back = startPos;
while (--back && IsSpaceEquiv(styler.StyleAt(back)))
;
if (styler.StyleAt(back) == SCE_C_OPERATOR) {
chPrevNonWhite = styler.SafeGetCharAt(back);
}
}
StyleContext sc(startPos, length, initStyle, styler);
for (; sc.More(); sc.Forward()) {
if (sc.atLineStart) {
if (sc.state == SCE_C_STRING) {
// Prevent SCE_C_STRINGEOL from leaking back to previous line which
// ends with a line continuation by locking in the state upto this position.
sc.SetState(SCE_C_STRING);
}
// Reset states to begining of colourise so no surprises
// if different sets of lines lexed.
visibleChars = 0;
lastWordWasUUID = false;
}
// 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();
}
continuationLine = true;
continue;
}
}
// Determine if the current state should terminate.
switch (sc.state) {
case SCE_C_OPERATOR:
sc.SetState(SCE_C_DEFAULT);
break;
case SCE_C_NUMBER:
// We accept almost anything because of hex. and number suffixes
if (!setWord.Contains(sc.ch)) {
sc.SetState(SCE_C_DEFAULT);
}
break;
case SCE_C_IDENTIFIER:
if (!setWord.Contains(sc.ch) || (sc.ch == '.')) {
char s[1000];
if (caseSensitive) {
sc.GetCurrent(s, sizeof(s));
} else {
sc.GetCurrentLowered(s, sizeof(s));
}
if (keywords.InList(s)) {
lastWordWasUUID = strcmp(s, "uuid") == 0;
sc.ChangeState(SCE_C_WORD);
} else if (keywords2.InList(s)) {
sc.ChangeState(SCE_C_WORD2);
} else if (keywords4.InList(s)) {
sc.ChangeState(SCE_C_GLOBALCLASS);
}
sc.SetState(SCE_C_DEFAULT);
}
break;
case SCE_C_PREPROCESSOR:
if (sc.atLineStart && !continuationLine) {
sc.SetState(SCE_C_DEFAULT);
} else if (stylingWithinPreprocessor) {
if (IsASpace(sc.ch)) {
sc.SetState(SCE_C_DEFAULT);
}
} else {
if (sc.Match('/', '*') || sc.Match('/', '/')) {
sc.SetState(SCE_C_DEFAULT);
}
}
break;
case SCE_C_COMMENT:
if (sc.Match('*', '/')) {
sc.Forward();
sc.ForwardSetState(SCE_C_DEFAULT);
}
break;
case SCE_C_COMMENTDOC:
if (sc.Match('*', '/')) {
sc.Forward();
sc.ForwardSetState(SCE_C_DEFAULT);
} else if (sc.ch == '@' || sc.ch == '\\') { // JavaDoc and Doxygen support
// Verify that we have the conditions to mark a comment-doc-keyword
if ((IsASpace(sc.chPrev) || sc.chPrev == '*') && (!IsASpace(sc.chNext))) {
styleBeforeDCKeyword = SCE_C_COMMENTDOC;
sc.SetState(SCE_C_COMMENTDOCKEYWORD);
}
}
break;
case SCE_C_COMMENTLINE:
if (sc.atLineStart) {
sc.SetState(SCE_C_DEFAULT);
}
break;
case SCE_C_COMMENTLINEDOC:
if (sc.atLineStart) {
sc.SetState(SCE_C_DEFAULT);
} else if (sc.ch == '@' || sc.ch == '\\') { // JavaDoc and Doxygen support
// Verify that we have the conditions to mark a comment-doc-keyword
if ((IsASpace(sc.chPrev) || sc.chPrev == '/' || sc.chPrev == '!') && (!IsASpace(sc.chNext))) {
styleBeforeDCKeyword = SCE_C_COMMENTLINEDOC;
sc.SetState(SCE_C_COMMENTDOCKEYWORD);
}
}
break;
case SCE_C_COMMENTDOCKEYWORD:
if ((styleBeforeDCKeyword == SCE_C_COMMENTDOC) && sc.Match('*', '/')) {
sc.ChangeState(SCE_C_COMMENTDOCKEYWORDERROR);
sc.Forward();
sc.ForwardSetState(SCE_C_DEFAULT);
} else if (!setDoxygen.Contains(sc.ch)) {
char s[100];
if (caseSensitive) {
sc.GetCurrent(s, sizeof(s));
} else {
sc.GetCurrentLowered(s, sizeof(s));
}
if (!IsASpace(sc.ch) || !keywords3.InList(s + 1)) {
sc.ChangeState(SCE_C_COMMENTDOCKEYWORDERROR);
}
sc.SetState(styleBeforeDCKeyword);
}
break;
case SCE_C_STRING:
if (sc.atLineEnd) {
sc.ChangeState(SCE_C_STRINGEOL);
} else if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_C_DEFAULT);
}
break;
case SCE_C_CHARACTER:
if (sc.atLineEnd) {
sc.ChangeState(SCE_C_STRINGEOL);
} else if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\'') {
sc.ForwardSetState(SCE_C_DEFAULT);
}
break;
case SCE_C_REGEX:
if (sc.atLineStart) {
sc.SetState(SCE_C_DEFAULT);
} else if (sc.ch == '/') {
sc.Forward();
while ((sc.ch < 0x80) && islower(sc.ch))
sc.Forward(); // gobble regex flags
sc.SetState(SCE_C_DEFAULT);
} else if (sc.ch == '\\') {
// Gobble up the quoted character
if (sc.chNext == '\\' || sc.chNext == '/') {
sc.Forward();
}
}
break;
case SCE_C_STRINGEOL:
if (sc.atLineStart) {
sc.SetState(SCE_C_DEFAULT);
}
break;
case SCE_C_VERBATIM:
if (sc.ch == '\"') {
if (sc.chNext == '\"') {
sc.Forward();
} else {
sc.ForwardSetState(SCE_C_DEFAULT);
}
}
break;
case SCE_C_UUID:
if (sc.ch == '\r' || sc.ch == '\n' || sc.ch == ')') {
sc.SetState(SCE_C_DEFAULT);
}
}
// Determine if a new state should be entered.
if (sc.state == SCE_C_DEFAULT) {
if (sc.Match('@', '\"')) {
sc.SetState(SCE_C_VERBATIM);
sc.Forward();
} else if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
if (lastWordWasUUID) {
sc.SetState(SCE_C_UUID);
lastWordWasUUID = false;
} else {
sc.SetState(SCE_C_NUMBER);
}
} else if (setWordStart.Contains(sc.ch) || (sc.ch == '@')) {
if (lastWordWasUUID) {
sc.SetState(SCE_C_UUID);
lastWordWasUUID = false;
} else {
sc.SetState(SCE_C_IDENTIFIER);
}
} else if (sc.Match('/', '*')) {
if (sc.Match("/**") || sc.Match("/*!")) { // Support of Qt/Doxygen doc. style
sc.SetState(SCE_C_COMMENTDOC);
} else {
sc.SetState(SCE_C_COMMENT);
}
sc.Forward(); // Eat the * so it isn't used for the end of the comment
} else if (sc.Match('/', '/')) {
if ((sc.Match("///") && !sc.Match("////")) || sc.Match("//!"))
// Support of Qt/Doxygen doc. style
sc.SetState(SCE_C_COMMENTLINEDOC);
else
sc.SetState(SCE_C_COMMENTLINE);
} else if (sc.ch == '/' && setOKBeforeRE.Contains(chPrevNonWhite) &&
(!setCouldBePostOp.Contains(chPrevNonWhite) || !FollowsPostfixOperator(sc, styler))) {
sc.SetState(SCE_C_REGEX); // JavaScript's RegEx
} else if (sc.ch == '\"') {
sc.SetState(SCE_C_STRING);
} else if (sc.ch == '\'') {
sc.SetState(SCE_C_CHARACTER);
} else if (sc.ch == '#' && visibleChars == 0) {
// Preprocessor commands are alone on their line
sc.SetState(SCE_C_PREPROCESSOR);
// Skip whitespace between # and preprocessor word
do {
sc.Forward();
} while ((sc.ch == ' ' || sc.ch == '\t') && sc.More());
if (sc.atLineEnd) {
sc.SetState(SCE_C_DEFAULT);
}
} else if (isoperator(static_cast<char>(sc.ch))) {
sc.SetState(SCE_C_OPERATOR);
}
}
if (!IsASpace(sc.ch) && !IsSpaceEquiv(sc.state)) {
chPrevNonWhite = sc.ch;
visibleChars++;
}
continuationLine = false;
}
sc.Complete();
}
static bool IsStreamCommentStyle(int style) {
return style == SCE_C_COMMENT ||
style == SCE_C_COMMENTDOC ||
style == SCE_C_COMMENTDOCKEYWORD ||
style == SCE_C_COMMENTDOCKEYWORDERROR;
}
// 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 FoldCppDoc(unsigned int startPos, int length, int initStyle,
WordList *[], 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;
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) && (stylePrev != SCE_C_COMMENTLINEDOC)) {
levelNext++;
} else if (!IsStreamCommentStyle(styleNext) && (styleNext != SCE_C_COMMENTLINEDOC) && !atEOL) {
// Comments don't end at end of line and the next character may be unstyled.
levelNext--;
}
}
if (foldComment && (style == SCE_C_COMMENTLINE)) {
if ((ch == '/') && (chNext == '/')) {
char chNext2 = styler.SafeGetCharAt(i + 2);
if (chNext2 == '{') {
levelNext++;
} else if (chNext2 == '}') {
levelNext--;
}
}
}
if (foldPreprocessor && (style == SCE_C_PREPROCESSOR)) {
if (ch == '#') {
unsigned int j = i + 1;
while ((j < endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) {
j++;
}
if (styler.Match(j, "region") || styler.Match(j, "if")) {
levelNext++;
} else if (styler.Match(j, "end")) {
levelNext--;
}
}
}
if (style == SCE_C_OPERATOR) {
if (ch == '{') {
// Measure the minimum before a '{' to allow
// folding on "} else {"
if (levelMinCurrent > levelNext) {
levelMinCurrent = levelNext;
}
levelNext++;
} else if (ch == '}') {
levelNext--;
}
}
if (!IsASpace(ch))
visibleChars++;
if (atEOL || (i == endPos-1)) {
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;
}
}
}
static const char * const cppWordLists[] = {
"Primary keywords and identifiers",
"Secondary keywords and identifiers",
"Documentation comment keywords",
"Unused",
"Global classes and typedefs",
0,
};
static void ColouriseCppDocSensitive(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
Accessor &styler) {
ColouriseCppDoc(startPos, length, initStyle, keywordlists, styler, true);
}
static void ColouriseCppDocInsensitive(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
Accessor &styler) {
ColouriseCppDoc(startPos, length, initStyle, keywordlists, styler, false);
}
LexerModule lmCPP(SCLEX_CPP, ColouriseCppDocSensitive, "cpp", FoldCppDoc, cppWordLists);
LexerModule lmCPPNoCase(SCLEX_CPPNOCASE, ColouriseCppDocInsensitive, "cppnocase", FoldCppDoc, cppWordLists);
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