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LexCPP.cxx
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LexCPP.cxx
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// Scintilla source code edit control
/** @file LexCPP.cxx
** Lexer for C++, C, Java, and JavaScript.
** Further folding features and configuration properties added by "Udo Lechner" <dlchnr(at)gmx(dot)net>
**/
// Copyright 1998-2005 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include <cstdlib>
#include <cassert>
#include <cstring>
#include <utility>
#include <string>
#include <string_view>
#include <vector>
#include <map>
#include <algorithm>
#include <iterator>
#include <functional>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "StringCopy.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
#include "OptionSet.h"
#include "SparseState.h"
#include "SubStyles.h"
using namespace Scintilla;
using namespace Lexilla;
namespace {
// Use an unnamed namespace to protect the functions and classes from name conflicts
constexpr bool IsSpaceEquiv(int state) noexcept {
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.
bool FollowsPostfixOperator(const StyleContext &sc, LexAccessor &styler) {
Sci_Position pos = sc.currentPos;
while (--pos > 0) {
const char ch = styler[pos];
if (ch == '+' || ch == '-') {
return styler[pos - 1] == ch;
}
}
return false;
}
bool followsReturnKeyword(const StyleContext &sc, LexAccessor &styler) {
// Don't look at styles, so no need to flush.
Sci_Position pos = sc.currentPos;
const Sci_Position currentLine = styler.GetLine(pos);
const Sci_Position lineStartPos = styler.LineStart(currentLine);
while (--pos > lineStartPos) {
const char ch = styler.SafeGetCharAt(pos);
if (ch != ' ' && ch != '\t') {
break;
}
}
const char *retBack = "nruter";
const char *s = retBack;
while (*s
&& pos >= lineStartPos
&& styler.SafeGetCharAt(pos) == *s) {
s++;
pos--;
}
return !*s;
}
constexpr bool IsOperatorOrSpace(int ch) noexcept {
return isoperator(ch) || IsASpace(ch);
}
bool OnlySpaceOrTab(std::string_view s) noexcept {
for (const char ch : s) {
if (!IsASpaceOrTab(ch))
return false;
}
return true;
}
using Tokens = std::vector<std::string>;
Tokens StringSplit(const std::string &text, int separator) {
Tokens vs(text.empty() ? 0 : 1);
for (const char ch : text) {
if (ch == separator) {
vs.emplace_back();
} else {
vs.back() += ch;
}
}
return vs;
}
struct BracketPair {
Tokens::iterator itBracket;
Tokens::iterator itEndBracket;
};
BracketPair FindBracketPair(Tokens &tokens) {
const Tokens::iterator itBracket = std::find(tokens.begin(), tokens.end(), "(");
if (itBracket != tokens.end()) {
size_t nest = 0;
for (Tokens::iterator itTok = itBracket; itTok != tokens.end(); ++itTok) {
if (*itTok == "(") {
nest++;
} else if (*itTok == ")") {
nest--;
if (nest == 0) {
return { itBracket, itTok };
}
}
}
}
return { tokens.end(), tokens.end() };
}
void highlightTaskMarker(StyleContext &sc, LexAccessor &styler,
int activity, const WordList &markerList, bool caseSensitive) {
if (IsOperatorOrSpace(sc.chPrev) && !IsOperatorOrSpace(sc.ch) && markerList.Length()) {
std::string marker;
for (Sci_PositionU currPos = sc.currentPos; true; currPos++) {
const char ch = styler.SafeGetCharAt(currPos);
if (IsOperatorOrSpace(ch)) {
break;
}
if (caseSensitive)
marker.push_back(ch);
else
marker.push_back(MakeLowerCase(ch));
}
if (markerList.InList(marker)) {
sc.SetState(SCE_C_TASKMARKER|activity);
}
}
}
const CharacterSet setHexDigits(CharacterSet::setDigits, "ABCDEFabcdef");
const CharacterSet setOctDigits("01234567");
const CharacterSet setNoneNumeric;
class EscapeSequence {
const CharacterSet *escapeSetValid = nullptr;
int digitsLeft = 0;
public:
int outerState = SCE_C_DEFAULT;
EscapeSequence() = default;
void resetEscapeState(int state, int nextChar) noexcept {
digitsLeft = 0;
outerState = state;
escapeSetValid = &setNoneNumeric;
if (nextChar == 'U') {
digitsLeft = 9;
escapeSetValid = &setHexDigits;
} else if (nextChar == 'u') {
digitsLeft = 5;
escapeSetValid = &setHexDigits;
} else if (nextChar == 'x') {
digitsLeft = 5;
escapeSetValid = &setHexDigits;
} else if (setOctDigits.Contains(nextChar)) {
digitsLeft = 3;
escapeSetValid = &setOctDigits;
}
}
[[nodiscard]] bool atEscapeEnd(int currChar) const noexcept {
return (digitsLeft <= 0) || !escapeSetValid->Contains(currChar);
}
void consumeDigit() noexcept {
digitsLeft--;
}
};
std::string GetRestOfLine(LexAccessor &styler, Sci_Position start, bool allowSpace) {
std::string restOfLine;
Sci_Position line = styler.GetLine(start);
Sci_Position pos = start;
Sci_Position endLine = styler.LineEnd(line);
char ch = styler.SafeGetCharAt(start, '\n');
while (pos < endLine) {
if (ch == '\\' && ((pos + 1) == endLine)) {
// Continuation line
line++;
pos = styler.LineStart(line);
endLine = styler.LineEnd(line);
ch = styler.SafeGetCharAt(pos, '\n');
} else {
const char chNext = styler.SafeGetCharAt(pos + 1, '\n');
if (ch == '/' && (chNext == '/' || chNext == '*'))
break;
if (allowSpace || (ch != ' ')) {
restOfLine += ch;
}
pos++;
ch = chNext;
}
}
return restOfLine;
}
constexpr bool IsStreamCommentStyle(int style) noexcept {
return style == SCE_C_COMMENT ||
style == SCE_C_COMMENTDOC ||
style == SCE_C_COMMENTDOCKEYWORD ||
style == SCE_C_COMMENTDOCKEYWORDERROR;
}
struct PPDefinition {
Sci_Position line;
std::string key;
std::string value;
bool isUndef;
std::string arguments;
PPDefinition(Sci_Position line_, std::string_view key_, std::string_view value_, bool isUndef_, std::string_view arguments_) :
line(line_), key(key_), value(value_), isUndef(isUndef_), arguments(arguments_) {
}
};
constexpr int inactiveFlag = 0x40;
class LinePPState {
// Track the state of preprocessor conditionals to allow showing active and inactive
// code in different styles.
// Only works up to 31 levels of conditional nesting.
// state is a bit mask with 1 bit per level
// bit is 1 for level if section inactive, so any bits set = inactive style
int state = 0;
// ifTaken is a bit mask with 1 bit per level
// bit is 1 for level if some branch at this level has been taken
int ifTaken = 0;
// level is the nesting level of #if constructs
int level = -1;
static const int maximumNestingLevel = 31;
[[nodiscard]] int maskLevel() const noexcept {
if (level >= 0) {
return 1 << level;
}
return 1;
}
public:
LinePPState() noexcept = default;
[[nodiscard]] bool ValidLevel() const noexcept {
return level >= 0 && level < maximumNestingLevel;
}
[[nodiscard]] bool IsActive() const noexcept {
return state == 0;
}
[[nodiscard]] bool IsInactive() const noexcept {
return state != 0;
}
[[nodiscard]] int ActiveState() const noexcept {
return state ? inactiveFlag : 0;
}
[[nodiscard]] bool CurrentIfTaken() const noexcept {
return (ifTaken & maskLevel()) != 0;
}
void StartSection(bool on) noexcept {
level++;
if (ValidLevel()) {
if (on) {
state &= ~maskLevel();
ifTaken |= maskLevel();
} else {
state |= maskLevel();
ifTaken &= ~maskLevel();
}
}
}
void EndSection() noexcept {
if (ValidLevel()) {
state &= ~maskLevel();
ifTaken &= ~maskLevel();
}
level--;
}
void InvertCurrentLevel() noexcept {
if (ValidLevel()) {
state ^= maskLevel();
ifTaken |= maskLevel();
}
}
};
// Hold the preprocessor state for each line seen.
// Currently one entry per line but could become sparse with just one entry per preprocessor line.
class PPStates {
std::vector<LinePPState> vlls;
public:
[[nodiscard]] LinePPState ForLine(Sci_Position line) const noexcept {
if ((line > 0) && (vlls.size() > static_cast<size_t>(line))) {
return vlls[line];
}
return {};
}
void Add(Sci_Position line, LinePPState lls) {
vlls.resize(line+1);
vlls[line] = lls;
}
};
enum class BackQuotedString : int {
None,
RawString,
TemplateLiteral,
};
// string interpolating state
struct InterpolatingState {
int state;
int braceCount;
};
struct Definition {
std::string_view name;
std::string_view value;
std::string_view arguments;
};
constexpr std::string_view TrimSpaceTab(std::string_view sv) noexcept {
while (!sv.empty() && IsASpaceOrTab(sv.front())) {
sv.remove_prefix(1);
}
return sv;
}
// Parse a macro definition, either from a #define line in a file or from keywords.
// Either an object macro <NAME> <VALUE> or a function macro <NAME>(<ARGUMENTS>) <VALUE>.
// VALUE is optional and is treated as "1" if missing.
// #define ALLOW_PRINT
// #define VERSION 37
// #define VER(a,b) a*10+b
// Whitespace separates macro and value in files but keywords use '=' separator.
// 'endName' contains a set of characters that terminate the name of the macro.
constexpr Definition ParseDefine(std::string_view definition, std::string_view endName) {
Definition ret;
definition = TrimSpaceTab(definition);
const size_t afterName = definition.find_first_of(endName);
if (afterName != std::string_view::npos) {
ret.name = definition.substr(0, afterName);
if (definition.at(afterName) == '(') {
// Macro
definition.remove_prefix(afterName+1);
const size_t closeBracket = definition.find(')');
if (closeBracket != std::string_view::npos) {
ret.arguments = definition.substr(0, closeBracket);
definition.remove_prefix(closeBracket+1);
if (!definition.empty() && (endName.find(definition.front()) != std::string_view::npos)) {
definition.remove_prefix(1);
}
ret.value = definition;
} // else malformed as requires closing bracket
} else {
ret.value = definition.substr(afterName+1);
}
} else {
ret.name = definition;
ret.value = "1";
}
return ret;
}
// An individual named option for use in an OptionSet
// Options used for LexerCPP
struct OptionsCPP {
bool stylingWithinPreprocessor = false;
bool identifiersAllowDollars = true;
bool trackPreprocessor = true;
bool updatePreprocessor = true;
bool verbatimStringsAllowEscapes = false;
bool triplequotedStrings = false;
bool hashquotedStrings = false;
BackQuotedString backQuotedStrings = BackQuotedString::None;
bool escapeSequence = false;
bool fold = false;
bool foldSyntaxBased = true;
bool foldComment = false;
bool foldCommentMultiline = true;
bool foldCommentExplicit = true;
std::string foldExplicitStart;
std::string foldExplicitEnd;
bool foldExplicitAnywhere = false;
bool foldPreprocessor = false;
bool foldPreprocessorAtElse = false;
bool foldCompact = false;
bool foldAtElse = false;
};
const char *const cppWordLists[] = {
"Primary keywords and identifiers",
"Secondary keywords and identifiers",
"Documentation comment keywords",
"Global classes and typedefs",
"Preprocessor definitions",
"Task marker and error marker keywords",
nullptr,
};
struct OptionSetCPP : public OptionSet<OptionsCPP> {
OptionSetCPP() {
DefineProperty("styling.within.preprocessor", &OptionsCPP::stylingWithinPreprocessor,
"For C++ code, determines whether all preprocessor code is styled in the "
"preprocessor style (0, the default) or only from the initial # to the end "
"of the command word(1).");
DefineProperty("lexer.cpp.allow.dollars", &OptionsCPP::identifiersAllowDollars,
"Set to 0 to disallow the '$' character in identifiers with the cpp lexer.");
DefineProperty("lexer.cpp.track.preprocessor", &OptionsCPP::trackPreprocessor,
"Set to 1 to interpret #if/#else/#endif to grey out code that is not active.");
DefineProperty("lexer.cpp.update.preprocessor", &OptionsCPP::updatePreprocessor,
"Set to 1 to update preprocessor definitions when #define found.");
DefineProperty("lexer.cpp.verbatim.strings.allow.escapes", &OptionsCPP::verbatimStringsAllowEscapes,
"Set to 1 to allow verbatim strings to contain escape sequences.");
DefineProperty("lexer.cpp.triplequoted.strings", &OptionsCPP::triplequotedStrings,
"Set to 1 to enable highlighting of triple-quoted strings.");
DefineProperty("lexer.cpp.hashquoted.strings", &OptionsCPP::hashquotedStrings,
"Set to 1 to enable highlighting of hash-quoted strings.");
DefineProperty("lexer.cpp.backquoted.strings", &OptionsCPP::backQuotedStrings,
"Set how to highlighting back-quoted strings. "
"0 (the default) no highlighting. "
"1 highlighted as Go raw string. "
"2 highlighted as JavaScript template literal.");
DefineProperty("lexer.cpp.escape.sequence", &OptionsCPP::escapeSequence,
"Set to 1 to enable highlighting of escape sequences in strings");
DefineProperty("fold", &OptionsCPP::fold);
DefineProperty("fold.cpp.syntax.based", &OptionsCPP::foldSyntaxBased,
"Set this property to 0 to disable syntax based folding.");
DefineProperty("fold.comment", &OptionsCPP::foldComment,
"This option enables folding multi-line comments and explicit fold points when using the C++ lexer. "
"Explicit fold points allows adding extra folding by placing a //{ comment at the start and a //} "
"at the end of a section that should fold.");
DefineProperty("fold.cpp.comment.multiline", &OptionsCPP::foldCommentMultiline,
"Set this property to 0 to disable folding multi-line comments when fold.comment=1.");
DefineProperty("fold.cpp.comment.explicit", &OptionsCPP::foldCommentExplicit,
"Set this property to 0 to disable folding explicit fold points when fold.comment=1.");
DefineProperty("fold.cpp.explicit.start", &OptionsCPP::foldExplicitStart,
"The string to use for explicit fold start points, replacing the standard //{.");
DefineProperty("fold.cpp.explicit.end", &OptionsCPP::foldExplicitEnd,
"The string to use for explicit fold end points, replacing the standard //}.");
DefineProperty("fold.cpp.explicit.anywhere", &OptionsCPP::foldExplicitAnywhere,
"Set this property to 1 to enable explicit fold points anywhere, not just in line comments.");
DefineProperty("fold.cpp.preprocessor.at.else", &OptionsCPP::foldPreprocessorAtElse,
"This option enables folding on a preprocessor #else or #endif line of an #if statement.");
DefineProperty("fold.preprocessor", &OptionsCPP::foldPreprocessor,
"This option enables folding preprocessor directives when using the C++ lexer. "
"Includes C#'s explicit #region and #endregion folding directives.");
DefineProperty("fold.compact", &OptionsCPP::foldCompact);
DefineProperty("fold.at.else", &OptionsCPP::foldAtElse,
"This option enables C++ folding on a \"} else {\" line of an if statement.");
DefineWordListSets(cppWordLists);
}
};
const char styleSubable[] = {SCE_C_IDENTIFIER, SCE_C_COMMENTDOCKEYWORD, 0};
LexicalClass lexicalClasses[] = {
// Lexer Cpp SCLEX_CPP SCE_C_:
0, "SCE_C_DEFAULT", "default", "White space",
1, "SCE_C_COMMENT", "comment", "Comment: /* */.",
2, "SCE_C_COMMENTLINE", "comment line", "Line Comment: //.",
3, "SCE_C_COMMENTDOC", "comment documentation", "Doc comment: block comments beginning with /** or /*!",
4, "SCE_C_NUMBER", "literal numeric", "Number",
5, "SCE_C_WORD", "keyword", "Keyword",
6, "SCE_C_STRING", "literal string", "Double quoted string",
7, "SCE_C_CHARACTER", "literal string character", "Single quoted string",
8, "SCE_C_UUID", "literal uuid", "UUIDs (only in IDL)",
9, "SCE_C_PREPROCESSOR", "preprocessor", "Preprocessor",
10, "SCE_C_OPERATOR", "operator", "Operators",
11, "SCE_C_IDENTIFIER", "identifier", "Identifiers",
12, "SCE_C_STRINGEOL", "error literal string", "End of line where string is not closed",
13, "SCE_C_VERBATIM", "literal string multiline raw", "Verbatim strings for C#",
14, "SCE_C_REGEX", "literal regex", "Regular expressions for JavaScript",
15, "SCE_C_COMMENTLINEDOC", "comment documentation line", "Doc Comment Line: line comments beginning with /// or //!.",
16, "SCE_C_WORD2", "identifier", "Keywords2",
17, "SCE_C_COMMENTDOCKEYWORD", "comment documentation keyword", "Comment keyword",
18, "SCE_C_COMMENTDOCKEYWORDERROR", "error comment documentation keyword", "Comment keyword error",
19, "SCE_C_GLOBALCLASS", "identifier", "Global class",
20, "SCE_C_STRINGRAW", "literal string multiline raw", "Raw strings for C++0x",
21, "SCE_C_TRIPLEVERBATIM", "literal string multiline raw", "Triple-quoted strings for Vala",
22, "SCE_C_HASHQUOTEDSTRING", "literal string", "Hash-quoted strings for Pike",
23, "SCE_C_PREPROCESSORCOMMENT", "comment preprocessor", "Preprocessor stream comment",
24, "SCE_C_PREPROCESSORCOMMENTDOC", "comment preprocessor documentation", "Preprocessor stream doc comment",
25, "SCE_C_USERLITERAL", "literal", "User defined literals",
26, "SCE_C_TASKMARKER", "comment taskmarker", "Task Marker",
27, "SCE_C_ESCAPESEQUENCE", "literal string escapesequence", "Escape sequence",
};
const int sizeLexicalClasses = static_cast<int>(std::size(lexicalClasses));
}
class LexerCPP : public ILexer5 {
bool caseSensitive;
CharacterSet setWord;
CharacterSet setNegationOp;
CharacterSet setAddOp;
CharacterSet setMultOp;
CharacterSet setRelOp;
CharacterSet setLogicalOp;
CharacterSet setWordStart;
PPStates vlls;
std::vector<PPDefinition> ppDefineHistory;
std::map<Sci_Position, std::vector<InterpolatingState>> interpolatingAtEol;
WordList keywords;
WordList keywords2;
WordList keywords3;
WordList keywords4;
WordList ppDefinitions;
WordList markerList;
struct SymbolValue {
std::string value;
std::string arguments;
SymbolValue() noexcept = default;
SymbolValue(std::string_view value_, std::string_view arguments_) : value(value_), arguments(arguments_) {
}
SymbolValue &operator = (const std::string &value_) {
value = value_;
arguments.clear();
return *this;
}
[[nodiscard]] bool IsMacro() const noexcept {
return !arguments.empty();
}
};
using SymbolTable = std::map<std::string, SymbolValue>;
SymbolTable preprocessorDefinitionsStart;
OptionsCPP options;
OptionSetCPP osCPP;
EscapeSequence escapeSeq;
SparseState<std::string> rawStringTerminators;
enum { ssIdentifier, ssDocKeyword };
SubStyles subStyles{ styleSubable, SubStylesFirst, SubStylesAvailable, inactiveFlag };
std::string returnBuffer;
public:
explicit LexerCPP(bool caseSensitive_) :
caseSensitive(caseSensitive_),
setWord(CharacterSet::setAlphaNum, "._", true),
setNegationOp("!"),
setAddOp("+-"),
setMultOp("*/%"),
setRelOp("=!<>"),
setLogicalOp("|&") {
}
// Deleted so LexerCPP objects can not be copied.
LexerCPP(const LexerCPP &) = delete;
LexerCPP(LexerCPP &&) = delete;
void operator=(const LexerCPP &) = delete;
void operator=(LexerCPP &&) = delete;
virtual ~LexerCPP() = default;
void SCI_METHOD Release() noexcept override {
delete this;
}
int SCI_METHOD Version() const noexcept override {
return lvRelease5;
}
const char *SCI_METHOD PropertyNames() override {
return osCPP.PropertyNames();
}
int SCI_METHOD PropertyType(const char *name) override {
return osCPP.PropertyType(name);
}
const char *SCI_METHOD DescribeProperty(const char *name) override {
return osCPP.DescribeProperty(name);
}
Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override;
const char *SCI_METHOD DescribeWordListSets() override {
return osCPP.DescribeWordListSets();
}
Sci_Position SCI_METHOD WordListSet(int n, const char *wl) override;
void SCI_METHOD Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override;
void SCI_METHOD Fold(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) override;
void *SCI_METHOD PrivateCall(int, void *) noexcept override {
return nullptr;
}
int SCI_METHOD LineEndTypesSupported() noexcept override {
return SC_LINE_END_TYPE_UNICODE;
}
int SCI_METHOD AllocateSubStyles(int styleBase, int numberStyles) override {
return subStyles.Allocate(styleBase, numberStyles);
}
int SCI_METHOD SubStylesStart(int styleBase) override {
return subStyles.Start(styleBase);
}
int SCI_METHOD SubStylesLength(int styleBase) override {
return subStyles.Length(styleBase);
}
int SCI_METHOD StyleFromSubStyle(int subStyle) override {
const int styleBase = subStyles.BaseStyle(MaskActive(subStyle));
const int inactive = subStyle & inactiveFlag;
return styleBase | inactive;
}
int SCI_METHOD PrimaryStyleFromStyle(int style) noexcept override {
return MaskActive(style);
}
void SCI_METHOD FreeSubStyles() override {
subStyles.Free();
}
void SCI_METHOD SetIdentifiers(int style, const char *identifiers) override {
subStyles.SetIdentifiers(style, identifiers);
}
int SCI_METHOD DistanceToSecondaryStyles() noexcept override {
return inactiveFlag;
}
const char *SCI_METHOD GetSubStyleBases() noexcept override {
return styleSubable;
}
int SCI_METHOD NamedStyles() override {
return std::max(subStyles.LastAllocated() + 1,
sizeLexicalClasses) +
inactiveFlag;
}
const char *SCI_METHOD NameOfStyle(int style) override {
if (style >= NamedStyles())
return "";
if (style < sizeLexicalClasses)
return lexicalClasses[style].name;
// TODO: inactive and substyles
return "";
}
const char *SCI_METHOD TagsOfStyle(int style) override {
if (style >= NamedStyles())
return "Excess";
returnBuffer.clear();
const int firstSubStyle = subStyles.FirstAllocated();
if (firstSubStyle >= 0) {
const int lastSubStyle = subStyles.LastAllocated();
if (((style >= firstSubStyle) && (style <= (lastSubStyle))) ||
((style >= firstSubStyle + inactiveFlag) && (style <= (lastSubStyle + inactiveFlag)))) {
int styleActive = style;
if (style > lastSubStyle) {
returnBuffer = "inactive ";
styleActive -= inactiveFlag;
}
const int styleMain = StyleFromSubStyle(styleActive);
returnBuffer += lexicalClasses[styleMain].tags;
return returnBuffer.c_str();
}
}
if (style < sizeLexicalClasses)
return lexicalClasses[style].tags;
if (style >= inactiveFlag) {
returnBuffer = "inactive ";
const int styleActive = style - inactiveFlag;
if (styleActive < sizeLexicalClasses)
returnBuffer += lexicalClasses[styleActive].tags;
else
returnBuffer.clear();
return returnBuffer.c_str();
}
return "";
}
const char *SCI_METHOD DescriptionOfStyle(int style) override {
if (style >= NamedStyles())
return "";
if (style < sizeLexicalClasses)
return lexicalClasses[style].description;
// TODO: inactive and substyles
return "";
}
// ILexer5 methods
const char *SCI_METHOD GetName() override {
return caseSensitive ? "cpp" : "cppnocase";
}
int SCI_METHOD GetIdentifier() override {
return caseSensitive ? SCLEX_CPP : SCLEX_CPPNOCASE;
}
const char *SCI_METHOD PropertyGet(const char *key) override;
static ILexer5 *LexerFactoryCPP() {
return new LexerCPP(true);
}
static ILexer5 *LexerFactoryCPPInsensitive() {
return new LexerCPP(false);
}
constexpr static int MaskActive(int style) noexcept {
return style & ~inactiveFlag;
}
void EvaluateTokens(Tokens &tokens, const SymbolTable &preprocessorDefinitions);
[[nodiscard]] Tokens Tokenize(const std::string &expr) const;
bool EvaluateExpression(const std::string &expr, const SymbolTable &preprocessorDefinitions);
};
Sci_Position SCI_METHOD LexerCPP::PropertySet(const char *key, const char *val) {
if (osCPP.PropertySet(&options, key, val)) {
if (strcmp(key, "lexer.cpp.allow.dollars") == 0) {
setWord = CharacterSet(CharacterSet::setAlphaNum, "._", true);
if (options.identifiersAllowDollars) {
setWord.Add('$');
}
}
return 0;
}
return -1;
}
const char *SCI_METHOD LexerCPP::PropertyGet(const char *key) {
return osCPP.PropertyGet(key);
}
Sci_Position SCI_METHOD LexerCPP::WordListSet(int n, const char *wl) {
WordList *wordListN = nullptr;
switch (n) {
case 0:
wordListN = &keywords;
break;
case 1:
wordListN = &keywords2;
break;
case 2:
wordListN = &keywords3;
break;
case 3:
wordListN = &keywords4;
break;
case 4:
wordListN = &ppDefinitions;
break;
case 5:
wordListN = &markerList;
break;
default:
break;
}
Sci_Position firstModification = -1;
if (wordListN) {
if (wordListN->Set(wl)) {
firstModification = 0;
if (n == 4) {
// Rebuild preprocessorDefinitions
preprocessorDefinitionsStart.clear();
for (int nDefinition = 0; nDefinition < ppDefinitions.Length(); nDefinition++) {
const Definition def = ParseDefine(ppDefinitions.WordAt(nDefinition), "(=");
preprocessorDefinitionsStart[std::string(def.name)] = SymbolValue(def.value, def.arguments);
}
}
}
}
return firstModification;
}
void SCI_METHOD LexerCPP::Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) {
LexAccessor styler(pAccess);
const StyleContext::Transform transform = caseSensitive ?
StyleContext::Transform::none : StyleContext::Transform::lower;
const CharacterSet setOKBeforeRE("([{=,:;!%^&*|?~+-> ");
const CharacterSet setCouldBePostOp("+-");
const CharacterSet setDoxygen(CharacterSet::setAlpha, "$@\\&<>#{}[]");
setWordStart = CharacterSet(CharacterSet::setAlpha, "_", true);
const CharacterSet setInvalidRawFirst(" )\\\t\v\f\n");
if (options.identifiersAllowDollars) {
setWordStart.Add('$');
}
int chPrevNonWhite = ' ';
int visibleChars = 0;
bool lastWordWasUUID = false;
int styleBeforeDCKeyword = SCE_C_DEFAULT;
int styleBeforeTaskMarker = SCE_C_DEFAULT;
bool continuationLine = false;
bool isIncludePreprocessor = false;
bool isStringInPreprocessor = false;
bool inRERange = false;
bool seenDocKeyBrace = false;
std::vector<InterpolatingState> interpolatingStack;
Sci_Position lineCurrent = styler.GetLine(startPos);
if (options.backQuotedStrings == BackQuotedString::TemplateLiteral) {
// code copied from LexPython
auto it = interpolatingAtEol.find(lineCurrent - 1);
if (it != interpolatingAtEol.end()) {
interpolatingStack = it->second;
}
it = interpolatingAtEol.lower_bound(lineCurrent);
if (it != interpolatingAtEol.end()) {
interpolatingAtEol.erase(it, interpolatingAtEol.end());
}
}
if ((MaskActive(initStyle) == SCE_C_PREPROCESSOR) ||
(MaskActive(initStyle) == SCE_C_COMMENTLINE) ||
(MaskActive(initStyle) == SCE_C_COMMENTLINEDOC)) {
// Set continuationLine if last character of previous line is '\'
if (lineCurrent > 0) {
const Sci_Position endLinePrevious = styler.LineEnd(lineCurrent - 1);
if (endLinePrevious > 0) {
continuationLine = styler.SafeGetCharAt(endLinePrevious-1) == '\\';
}
}
}
// look back to set chPrevNonWhite properly for better regex colouring
if (startPos > 0) {
Sci_Position back = startPos;
while (--back && IsSpaceEquiv(MaskActive(styler.StyleAt(back))))
;
if (MaskActive(styler.StyleAt(back)) == SCE_C_OPERATOR) {
chPrevNonWhite = styler.SafeGetCharAt(back);
}
}
StyleContext sc(startPos, length, initStyle, styler);
LinePPState preproc = vlls.ForLine(lineCurrent);
bool definitionsChanged = false;
// Truncate ppDefineHistory before current line
if (!options.updatePreprocessor)
ppDefineHistory.clear();
const std::vector<PPDefinition>::iterator itInvalid = std::find_if(
ppDefineHistory.begin(), ppDefineHistory.end(),
[lineCurrent](const PPDefinition &p) noexcept { return p.line >= lineCurrent; });
if (itInvalid != ppDefineHistory.end()) {
ppDefineHistory.erase(itInvalid, ppDefineHistory.end());
definitionsChanged = true;
}
SymbolTable preprocessorDefinitions = preprocessorDefinitionsStart;
for (const PPDefinition &ppDef : ppDefineHistory) {
if (ppDef.isUndef)
preprocessorDefinitions.erase(ppDef.key);
else
preprocessorDefinitions[ppDef.key] = SymbolValue(ppDef.value, ppDef.arguments);
}
std::string rawStringTerminator = rawStringTerminators.ValueAt(lineCurrent-1);
SparseState<std::string> rawSTNew(lineCurrent);
std::string currentText;
int activitySet = preproc.ActiveState();
const WordClassifier &classifierIdentifiers = subStyles.Classifier(SCE_C_IDENTIFIER);
const WordClassifier &classifierDocKeyWords = subStyles.Classifier(SCE_C_COMMENTDOCKEYWORD);
Sci_PositionU lineEndNext = styler.LineEnd(lineCurrent);
if (sc.currentPos == 0 && sc.Match('#', '!')) {
// Shell Shebang at beginning of file
sc.SetState(SCE_C_COMMENTLINE);
sc.Forward();
}
for (; sc.More();) {
if (sc.atLineStart) {
// Using MaskActive() is not needed in the following statement.
// Inside inactive preprocessor declaration, state will be reset anyway at the end of this block.
if ((sc.state == SCE_C_STRING) || (sc.state == SCE_C_CHARACTER)) {
// Prevent SCE_C_STRINGEOL from leaking back to previous line which
// ends with a line continuation by locking in the state up to this position.
sc.SetState(sc.state);
}
if ((MaskActive(sc.state) == SCE_C_PREPROCESSOR) && (!continuationLine)) {
sc.SetState(SCE_C_DEFAULT|activitySet);
}
// Reset states to beginning of colourise so no surprises
// if different sets of lines lexed.
visibleChars = 0;
lastWordWasUUID = false;
isIncludePreprocessor = false;
inRERange = false;
if (preproc.IsInactive()) {
activitySet = inactiveFlag;
sc.SetState(sc.state | activitySet);
}
}
if (sc.atLineEnd) {
lineCurrent++;
lineEndNext = styler.LineEnd(lineCurrent);
vlls.Add(lineCurrent, preproc);
if (!rawStringTerminator.empty()) {
rawSTNew.Set(lineCurrent-1, rawStringTerminator);
}
if (!interpolatingStack.empty()) {
interpolatingAtEol[sc.currentLine] = interpolatingStack;
}
}
// Handle line continuation generically.
if (sc.ch == '\\') {
if ((sc.currentPos+1) >= lineEndNext) {
lineCurrent++;
lineEndNext = styler.LineEnd(lineCurrent);
vlls.Add(lineCurrent, preproc);
if (!rawStringTerminator.empty()) {
rawSTNew.Set(lineCurrent-1, rawStringTerminator);
}
sc.Forward();
if (sc.ch == '\r' && sc.chNext == '\n') {
// Even in UTF-8, \r and \n are separate
sc.Forward();
}
continuationLine = true;
sc.Forward();
continue;
}
}
const bool atLineEndBeforeSwitch = sc.atLineEnd;
// Determine if the current state should terminate.
switch (MaskActive(sc.state)) {
case SCE_C_OPERATOR:
sc.SetState(SCE_C_DEFAULT|activitySet);
break;
case SCE_C_NUMBER:
// We accept almost anything because of hex. and number suffixes
if (sc.ch == '_') {
sc.ChangeState(SCE_C_USERLITERAL|activitySet);
} else if (!(setWord.Contains(sc.ch)
|| (sc.ch == '\'')
|| (AnyOf(sc.chPrev, 'e', 'E', 'p', 'P') && AnyOf(sc.ch, '+', '-')))) {
sc.SetState(SCE_C_DEFAULT|activitySet);
}
break;
case SCE_C_USERLITERAL:
if (!(setWord.Contains(sc.ch)))
sc.SetState(SCE_C_DEFAULT|activitySet);
break;
case SCE_C_IDENTIFIER:
if (sc.atLineStart || sc.atLineEnd || !setWord.Contains(sc.ch) || (sc.ch == '.')) {
sc.GetCurrentString(currentText, transform);
if (keywords.InList(currentText)) {
lastWordWasUUID = currentText == "uuid";
sc.ChangeState(SCE_C_WORD|activitySet);
} else if (keywords2.InList(currentText)) {
sc.ChangeState(SCE_C_WORD2|activitySet);
} else if (keywords4.InList(currentText)) {
sc.ChangeState(SCE_C_GLOBALCLASS|activitySet);
} else {
const int subStyle = classifierIdentifiers.ValueFor(currentText);
if (subStyle >= 0) {
sc.ChangeState(subStyle|activitySet);
}
}
const bool literalString = sc.ch == '\"';
if (literalString || sc.ch == '\'') {
std::string_view s = currentText;
size_t lenS = s.length();
const bool raw = literalString && sc.chPrev == 'R' && !setInvalidRawFirst.Contains(sc.chNext);
if (raw) {
s.remove_suffix(1);
lenS--;