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notepad-plus-plus/lexilla/lexers/LexPython.cxx

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// Scintilla source code edit control
/** @file LexPython.cxx
** Lexer for Python.
**/
// Copyright 1998-2002 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 <string>
#include <string_view>
#include <vector>
#include <map>
#include <algorithm>
#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 "CharacterCategory.h"
#include "LexerModule.h"
#include "OptionSet.h"
#include "SubStyles.h"
#include "DefaultLexer.h"
using namespace Scintilla;
using namespace Lexilla;
namespace {
// Use an unnamed namespace to protect the functions and classes from name conflicts
/* Notes on f-strings: f-strings are strings prefixed with f (e.g. f'') that may
have arbitrary expressions in {}. The tokens in the expressions are lexed as if
they were outside of any string. Expressions may contain { and } characters as
long as there is a closing } for every {, may be 2+ lines in a triple quoted
string, and may have a formatting specifier following a ! or :, but both !
and : are valid inside of a bracketed expression and != is a valid
expression token even outside of a bracketed expression.
When in an f-string expression, the lexer keeps track of the state value of
the f-string and the nesting count for the expression (# of [, (, { seen - # of
}, ), ] seen). f-strings may be nested (e.g. f'{ a + f"{1+2}"') so a stack of
states and nesting counts is kept. If a f-string expression continues beyond
the end of a line, this stack is saved in a std::map that maps a line number to
the stack at the end of that line. std::vector is used for the stack.
The PEP for f-strings is at https://www.python.org/dev/peps/pep-0498/
*/
struct SingleFStringExpState {
int state;
int nestingCount;
};
/* kwCDef, kwCTypeName only used for Cython */
enum kwType { kwOther, kwClass, kwDef, kwImport, kwCDef, kwCTypeName, kwCPDef };
enum literalsAllowed { litNone = 0, litU = 1, litB = 2, litF = 4 };
constexpr int indicatorWhitespace = 1;
bool IsPyComment(Accessor &styler, Sci_Position pos, Sci_Position len) {
return len > 0 && styler[pos] == '#';
}
constexpr bool IsPyStringTypeChar(int ch, literalsAllowed allowed) noexcept {
return
((allowed & litB) && (ch == 'b' || ch == 'B')) ||
((allowed & litU) && (ch == 'u' || ch == 'U')) ||
((allowed & litF) && (ch == 'f' || ch == 'F'));
}
bool IsPyStringStart(int ch, int chNext, int chNext2, literalsAllowed allowed) noexcept {
if (ch == '\'' || ch == '"')
return true;
if (IsPyStringTypeChar(ch, allowed)) {
if (chNext == '"' || chNext == '\'')
return true;
if ((chNext == 'r' || chNext == 'R') && (chNext2 == '"' || chNext2 == '\''))
return true;
}
if ((ch == 'r' || ch == 'R') && (chNext == '"' || chNext == '\''))
return true;
return false;
}
constexpr bool IsPyFStringState(int st) noexcept {
return ((st == SCE_P_FCHARACTER) || (st == SCE_P_FSTRING) ||
(st == SCE_P_FTRIPLE) || (st == SCE_P_FTRIPLEDOUBLE));
}
constexpr bool IsPySingleQuoteStringState(int st) noexcept {
return ((st == SCE_P_CHARACTER) || (st == SCE_P_STRING) ||
(st == SCE_P_FCHARACTER) || (st == SCE_P_FSTRING));
}
constexpr bool IsPyTripleQuoteStringState(int st) noexcept {
return ((st == SCE_P_TRIPLE) || (st == SCE_P_TRIPLEDOUBLE) ||
(st == SCE_P_FTRIPLE) || (st == SCE_P_FTRIPLEDOUBLE));
}
char GetPyStringQuoteChar(int st) noexcept {
if ((st == SCE_P_CHARACTER) || (st == SCE_P_FCHARACTER) ||
(st == SCE_P_TRIPLE) || (st == SCE_P_FTRIPLE))
return '\'';
if ((st == SCE_P_STRING) || (st == SCE_P_FSTRING) ||
(st == SCE_P_TRIPLEDOUBLE) || (st == SCE_P_FTRIPLEDOUBLE))
return '"';
return '\0';
}
void PushStateToStack(int state, std::vector<SingleFStringExpState> &stack, SingleFStringExpState *&currentFStringExp) {
SingleFStringExpState single = {state, 0};
stack.push_back(single);
currentFStringExp = &stack.back();
}
int PopFromStateStack(std::vector<SingleFStringExpState> &stack, SingleFStringExpState *&currentFStringExp) noexcept {
int state = 0;
if (!stack.empty()) {
state = stack.back().state;
stack.pop_back();
}
if (stack.empty()) {
currentFStringExp = nullptr;
} else {
currentFStringExp = &stack.back();
}
return state;
}
/* Return the state to use for the string starting at i; *nextIndex will be set to the first index following the quote(s) */
int GetPyStringState(Accessor &styler, Sci_Position i, Sci_PositionU *nextIndex, literalsAllowed allowed) {
char ch = styler.SafeGetCharAt(i);
char chNext = styler.SafeGetCharAt(i + 1);
const int firstIsF = (ch == 'f' || ch == 'F');
// Advance beyond r, u, or ur prefix (or r, b, or br in Python 2.7+ and r, f, or fr in Python 3.6+), but bail if there are any unexpected chars
if (ch == 'r' || ch == 'R') {
i++;
ch = styler.SafeGetCharAt(i);
chNext = styler.SafeGetCharAt(i + 1);
} else if (IsPyStringTypeChar(ch, allowed)) {
if (chNext == 'r' || chNext == 'R')
i += 2;
else
i += 1;
ch = styler.SafeGetCharAt(i);
chNext = styler.SafeGetCharAt(i + 1);
}
if (ch != '"' && ch != '\'') {
*nextIndex = i + 1;
return SCE_P_DEFAULT;
}
if (ch == chNext && ch == styler.SafeGetCharAt(i + 2)) {
*nextIndex = i + 3;
if (ch == '"')
return (firstIsF ? SCE_P_FTRIPLEDOUBLE : SCE_P_TRIPLEDOUBLE);
else
return (firstIsF ? SCE_P_FTRIPLE : SCE_P_TRIPLE);
} else {
*nextIndex = i + 1;
if (ch == '"')
return (firstIsF ? SCE_P_FSTRING : SCE_P_STRING);
else
return (firstIsF ? SCE_P_FCHARACTER : SCE_P_CHARACTER);
}
}
inline bool IsAWordChar(int ch, bool unicodeIdentifiers) {
if (IsASCII(ch))
return (IsAlphaNumeric(ch) || ch == '.' || ch == '_');
if (!unicodeIdentifiers)
return false;
// Python uses the XID_Continue set from Unicode data
return IsXidContinue(ch);
}
inline bool IsAWordStart(int ch, bool unicodeIdentifiers) {
if (IsASCII(ch))
return (IsUpperOrLowerCase(ch) || ch == '_');
if (!unicodeIdentifiers)
return false;
// Python uses the XID_Start set from Unicode data
return IsXidStart(ch);
}
bool IsFirstNonWhitespace(Sci_Position pos, Accessor &styler) {
const Sci_Position line = styler.GetLine(pos);
const Sci_Position start_pos = styler.LineStart(line);
for (Sci_Position i = start_pos; i < pos; i++) {
const char ch = styler[i];
if (!(ch == ' ' || ch == '\t'))
return false;
}
return true;
}
// Options used for LexerPython
struct OptionsPython {
int whingeLevel;
bool base2or8Literals;
bool stringsU;
bool stringsB;
bool stringsF;
bool stringsOverNewline;
bool keywords2NoSubIdentifiers;
bool fold;
bool foldQuotes;
bool foldCompact;
bool unicodeIdentifiers;
int identifierAttributes;
int decoratorAttributes;
OptionsPython() noexcept {
whingeLevel = 0;
base2or8Literals = true;
stringsU = true;
stringsB = true;
stringsF = true;
stringsOverNewline = false;
keywords2NoSubIdentifiers = false;
fold = false;
foldQuotes = false;
foldCompact = false;
unicodeIdentifiers = true;
identifierAttributes = 0;
decoratorAttributes = 0;
}
literalsAllowed AllowedLiterals() const noexcept {
literalsAllowed allowedLiterals = stringsU ? litU : litNone;
if (stringsB)
allowedLiterals = static_cast<literalsAllowed>(allowedLiterals | litB);
if (stringsF)
allowedLiterals = static_cast<literalsAllowed>(allowedLiterals | litF);
return allowedLiterals;
}
};
const char *const pythonWordListDesc[] = {
"Keywords",
"Highlighted identifiers",
nullptr
};
struct OptionSetPython : public OptionSet<OptionsPython> {
OptionSetPython() {
DefineProperty("tab.timmy.whinge.level", &OptionsPython::whingeLevel,
"For Python code, checks whether indenting is consistent. "
"The default, 0 turns off indentation checking, "
"1 checks whether each line is potentially inconsistent with the previous line, "
"2 checks whether any space characters occur before a tab character in the indentation, "
"3 checks whether any spaces are in the indentation, and "
"4 checks for any tab characters in the indentation. "
"1 is a good level to use.");
DefineProperty("lexer.python.literals.binary", &OptionsPython::base2or8Literals,
"Set to 0 to not recognise Python 3 binary and octal literals: 0b1011 0o712.");
DefineProperty("lexer.python.strings.u", &OptionsPython::stringsU,
"Set to 0 to not recognise Python Unicode literals u\"x\" as used before Python 3.");
DefineProperty("lexer.python.strings.b", &OptionsPython::stringsB,
"Set to 0 to not recognise Python 3 bytes literals b\"x\".");
DefineProperty("lexer.python.strings.f", &OptionsPython::stringsF,
"Set to 0 to not recognise Python 3.6 f-string literals f\"var={var}\".");
DefineProperty("lexer.python.strings.over.newline", &OptionsPython::stringsOverNewline,
"Set to 1 to allow strings to span newline characters.");
DefineProperty("lexer.python.keywords2.no.sub.identifiers", &OptionsPython::keywords2NoSubIdentifiers,
"When enabled, it will not style keywords2 items that are used as a sub-identifier. "
"Example: when set, will not highlight \"foo.open\" when \"open\" is a keywords2 item.");
DefineProperty("fold", &OptionsPython::fold);
DefineProperty("fold.quotes.python", &OptionsPython::foldQuotes,
"This option enables folding multi-line quoted strings when using the Python lexer.");
DefineProperty("fold.compact", &OptionsPython::foldCompact);
DefineProperty("lexer.python.unicode.identifiers", &OptionsPython::unicodeIdentifiers,
"Set to 0 to not recognise Python 3 Unicode identifiers.");
DefineProperty("lexer.python.identifier.attributes", &OptionsPython::identifierAttributes,
"Set to 1 to recognise Python identifier attributes.");
DefineProperty("lexer.python.decorator.attributes", &OptionsPython::decoratorAttributes,
"Set to 1 to recognise Python decorator attributes.");
DefineWordListSets(pythonWordListDesc);
}
};
const char styleSubable[] = { SCE_P_IDENTIFIER, 0 };
LexicalClass lexicalClasses[] = {
// Lexer Python SCLEX_PYTHON SCE_P_:
0, "SCE_P_DEFAULT", "default", "White space",
1, "SCE_P_COMMENTLINE", "comment line", "Comment",
2, "SCE_P_NUMBER", "literal numeric", "Number",
3, "SCE_P_STRING", "literal string", "String",
4, "SCE_P_CHARACTER", "literal string", "Single quoted string",
5, "SCE_P_WORD", "keyword", "Keyword",
6, "SCE_P_TRIPLE", "literal string", "Triple quotes",
7, "SCE_P_TRIPLEDOUBLE", "literal string", "Triple double quotes",
8, "SCE_P_CLASSNAME", "identifier", "Class name definition",
9, "SCE_P_DEFNAME", "identifier", "Function or method name definition",
10, "SCE_P_OPERATOR", "operator", "Operators",
11, "SCE_P_IDENTIFIER", "identifier", "Identifiers",
12, "SCE_P_COMMENTBLOCK", "comment", "Comment-blocks",
13, "SCE_P_STRINGEOL", "error literal string", "End of line where string is not closed",
14, "SCE_P_WORD2", "identifier", "Highlighted identifiers",
15, "SCE_P_DECORATOR", "preprocessor", "Decorators",
16, "SCE_P_FSTRING", "literal string interpolated", "F-String",
17, "SCE_P_FCHARACTER", "literal string interpolated", "Single quoted f-string",
18, "SCE_P_FTRIPLE", "literal string interpolated", "Triple quoted f-string",
19, "SCE_P_FTRIPLEDOUBLE", "literal string interpolated", "Triple double quoted f-string",
20, "SCE_P_ATTRIBUTE", "identifier", "Attribute of identifier",
};
}
class LexerPython : public DefaultLexer {
WordList keywords;
WordList keywords2;
OptionsPython options;
OptionSetPython osPython;
enum { ssIdentifier };
SubStyles subStyles;
std::map<Sci_Position, std::vector<SingleFStringExpState> > ftripleStateAtEol;
public:
explicit LexerPython() :
DefaultLexer("python", SCLEX_PYTHON, lexicalClasses, ELEMENTS(lexicalClasses)),
subStyles(styleSubable, 0x80, 0x40, 0) {
}
~LexerPython() override {
}
void SCI_METHOD Release() override {
delete this;
}
int SCI_METHOD Version() const override {
return lvRelease5;
}
const char *SCI_METHOD PropertyNames() override {
return osPython.PropertyNames();
}
int SCI_METHOD PropertyType(const char *name) override {
return osPython.PropertyType(name);
}
const char *SCI_METHOD DescribeProperty(const char *name) override {
return osPython.DescribeProperty(name);
}
Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override;
const char * SCI_METHOD PropertyGet(const char *key) override {
return osPython.PropertyGet(key);
}
const char *SCI_METHOD DescribeWordListSets() override {
return osPython.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 *) override {
return nullptr;
}
int SCI_METHOD LineEndTypesSupported() 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(subStyle);
return styleBase;
}
int SCI_METHOD PrimaryStyleFromStyle(int style) override {
return 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() override {
return 0;
}
const char *SCI_METHOD GetSubStyleBases() override {
return styleSubable;
}
static ILexer5 *LexerFactoryPython() {
return new LexerPython();
}
private:
void ProcessLineEnd(StyleContext &sc, std::vector<SingleFStringExpState> &fstringStateStack, SingleFStringExpState *&currentFStringExp, bool &inContinuedString);
};
Sci_Position SCI_METHOD LexerPython::PropertySet(const char *key, const char *val) {
if (osPython.PropertySet(&options, key, val)) {
return 0;
}
return -1;
}
Sci_Position SCI_METHOD LexerPython::WordListSet(int n, const char *wl) {
WordList *wordListN = nullptr;
switch (n) {
case 0:
wordListN = &keywords;
break;
case 1:
wordListN = &keywords2;
break;
default:
break;
}
Sci_Position firstModification = -1;
if (wordListN) {
WordList wlNew;
wlNew.Set(wl);
if (*wordListN != wlNew) {
wordListN->Set(wl);
firstModification = 0;
}
}
return firstModification;
}
void LexerPython::ProcessLineEnd(StyleContext &sc, std::vector<SingleFStringExpState> &fstringStateStack, SingleFStringExpState *&currentFStringExp, bool &inContinuedString) {
long deepestSingleStateIndex = -1;
unsigned long i;
// Find the deepest single quote state because that string will end; no \ continuation in f-string
for (i = 0; i < fstringStateStack.size(); i++) {
if (IsPySingleQuoteStringState(fstringStateStack[i].state)) {
deepestSingleStateIndex = i;
break;
}
}
if (deepestSingleStateIndex != -1) {
sc.SetState(fstringStateStack[deepestSingleStateIndex].state);
while (fstringStateStack.size() > static_cast<unsigned long>(deepestSingleStateIndex)) {
PopFromStateStack(fstringStateStack, currentFStringExp);
}
}
if (!fstringStateStack.empty()) {
std::pair<Sci_Position, std::vector<SingleFStringExpState> > val;
val.first = sc.currentLine;
val.second = fstringStateStack;
ftripleStateAtEol.insert(val);
}
if ((sc.state == SCE_P_DEFAULT)
|| IsPyTripleQuoteStringState(sc.state)) {
// Perform colourisation of white space and triple quoted strings at end of each line to allow
// tab marking to work inside white space and triple quoted strings
sc.SetState(sc.state);
}
if (IsPySingleQuoteStringState(sc.state)) {
if (inContinuedString || options.stringsOverNewline) {
inContinuedString = false;
} else {
sc.ChangeState(SCE_P_STRINGEOL);
sc.ForwardSetState(SCE_P_DEFAULT);
}
}
}
void SCI_METHOD LexerPython::Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) {
Accessor styler(pAccess, nullptr);
// Track whether in f-string expression; vector is used for a stack to
// handle nested f-strings such as f"""{f'''{f"{f'{1}'}"}'''}"""
std::vector<SingleFStringExpState> fstringStateStack;
SingleFStringExpState *currentFStringExp = nullptr;
const Sci_Position endPos = startPos + length;
// Backtrack to previous line in case need to fix its tab whinging
Sci_Position lineCurrent = styler.GetLine(startPos);
if (startPos > 0) {
if (lineCurrent > 0) {
lineCurrent--;
// Look for backslash-continued lines
while (lineCurrent > 0) {
const Sci_Position eolPos = styler.LineStart(lineCurrent) - 1;
const int eolStyle = styler.StyleAt(eolPos);
if (eolStyle == SCE_P_STRING
|| eolStyle == SCE_P_CHARACTER
|| eolStyle == SCE_P_STRINGEOL) {
lineCurrent -= 1;
} else {
break;
}
}
startPos = styler.LineStart(lineCurrent);
}
initStyle = startPos == 0 ? SCE_P_DEFAULT : styler.StyleAt(startPos - 1);
}
const literalsAllowed allowedLiterals = options.AllowedLiterals();
initStyle = initStyle & 31;
if (initStyle == SCE_P_STRINGEOL) {
initStyle = SCE_P_DEFAULT;
}
// Set up fstate stack from last line and remove any subsequent ftriple at eol states
std::map<Sci_Position, std::vector<SingleFStringExpState> >::iterator it;
it = ftripleStateAtEol.find(lineCurrent - 1);
if (it != ftripleStateAtEol.end() && !it->second.empty()) {
fstringStateStack = it->second;
currentFStringExp = &fstringStateStack.back();
}
it = ftripleStateAtEol.lower_bound(lineCurrent);
if (it != ftripleStateAtEol.end()) {
ftripleStateAtEol.erase(it, ftripleStateAtEol.end());
}
kwType kwLast = kwOther;
int spaceFlags = 0;
styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
bool base_n_number = false;
const WordClassifier &classifierIdentifiers = subStyles.Classifier(SCE_P_IDENTIFIER);
StyleContext sc(startPos, endPos - startPos, initStyle, styler);
bool indentGood = true;
Sci_Position startIndicator = sc.currentPos;
bool inContinuedString = false;
for (; sc.More(); sc.Forward()) {
if (sc.atLineStart) {
styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
indentGood = true;
if (options.whingeLevel == 1) {
indentGood = (spaceFlags & wsInconsistent) == 0;
} else if (options.whingeLevel == 2) {
indentGood = (spaceFlags & wsSpaceTab) == 0;
} else if (options.whingeLevel == 3) {
indentGood = (spaceFlags & wsSpace) == 0;
} else if (options.whingeLevel == 4) {
indentGood = (spaceFlags & wsTab) == 0;
}
if (!indentGood) {
styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 0);
startIndicator = sc.currentPos;
}
}
if (sc.atLineEnd) {
ProcessLineEnd(sc, fstringStateStack, currentFStringExp, inContinuedString);
lineCurrent++;
if (!sc.More())
break;
}
bool needEOLCheck = false;
if (sc.state == SCE_P_OPERATOR) {
kwLast = kwOther;
sc.SetState(SCE_P_DEFAULT);
} else if (sc.state == SCE_P_NUMBER) {
if (!IsAWordChar(sc.ch, false) &&
!(!base_n_number && ((sc.ch == '+' || sc.ch == '-') && (sc.chPrev == 'e' || sc.chPrev == 'E')))) {
sc.SetState(SCE_P_DEFAULT);
}
} else if (sc.state == SCE_P_IDENTIFIER) {
if ((sc.ch == '.') || (!IsAWordChar(sc.ch, options.unicodeIdentifiers))) {
char s[100];
sc.GetCurrent(s, sizeof(s));
int style = SCE_P_IDENTIFIER;
if ((kwLast == kwImport) && (strcmp(s, "as") == 0)) {
style = SCE_P_WORD;
} else if (keywords.InList(s)) {
style = SCE_P_WORD;
} else if (kwLast == kwClass) {
style = SCE_P_CLASSNAME;
} else if (kwLast == kwDef) {
style = SCE_P_DEFNAME;
} else if (kwLast == kwCDef || kwLast == kwCPDef) {
Sci_Position pos = sc.currentPos;
unsigned char ch = styler.SafeGetCharAt(pos, '\0');
while (ch != '\0') {
if (ch == '(') {
style = SCE_P_DEFNAME;
break;
} else if (ch == ':') {
style = SCE_P_CLASSNAME;
break;
} else if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') {
pos++;
ch = styler.SafeGetCharAt(pos, '\0');
} else {
break;
}
}
} else if (keywords2.InList(s)) {
if (options.keywords2NoSubIdentifiers) {
// We don't want to highlight keywords2
// that are used as a sub-identifier,
// i.e. not open in "foo.open".
const Sci_Position pos = styler.GetStartSegment() - 1;
if (pos < 0 || (styler.SafeGetCharAt(pos, '\0') != '.'))
style = SCE_P_WORD2;
} else {
style = SCE_P_WORD2;
}
} else {
const int subStyle = classifierIdentifiers.ValueFor(s);
if (subStyle >= 0) {
style = subStyle;
}
if (options.identifierAttributes > 0 || options.decoratorAttributes > 0) {
// Does the user even want attributes styled?
Sci_Position pos = styler.GetStartSegment() - 1;
unsigned char ch = styler.SafeGetCharAt(pos, '\0');
while (ch != '\0' && (ch == '.' || ch == ' ' || ch == '\\' || ch == '\t' || ch == '\n' || ch == '\r')) {
// Backwards search for a . while only allowing certain valid characters
if (IsAWordChar(ch, options.unicodeIdentifiers)) {
break;
}
pos--;
ch = styler.SafeGetCharAt(pos, '\0');
}
if (pos < 0 || ch == '.') {
// Is this an attribute we could style? if it is, do as asked
bool isComment = false;
bool isDecoratorAttribute = false;
const Sci_Position attrLine = styler.GetLine(pos);
for (Sci_Position i = styler.LineStart(attrLine); i < pos; i++) {
const char attrCh = styler[i];
if (attrCh == '@')
isDecoratorAttribute = true;
if (attrCh == '#')
isComment = true;
// Detect if this attribute belongs to a decorator
if (!(ch == ' ' || ch == '\t'))
break;
}
if (((isDecoratorAttribute) && (!isComment)) && (((options.decoratorAttributes == 1) && (style == SCE_P_IDENTIFIER)) || (options.decoratorAttributes == 2))){
// Style decorator attributes as decorators but respect already styled identifiers (unless requested to ignore already styled identifiers)
style = SCE_P_DECORATOR;
}
if (((!isDecoratorAttribute) && (!isComment)) && (((options.identifierAttributes == 1) && (style == SCE_P_IDENTIFIER)) || (options.identifierAttributes == 2))){
// Style attributes and ignore decorator attributes but respect already styled identifiers (unless requested to ignore already styled identifiers)
style = SCE_P_ATTRIBUTE;
}
}
}
}
sc.ChangeState(style);
sc.SetState(SCE_P_DEFAULT);
if (style == SCE_P_WORD) {
if (0 == strcmp(s, "class"))
kwLast = kwClass;
else if (0 == strcmp(s, "def"))
kwLast = kwDef;
else if (0 == strcmp(s, "import"))
kwLast = kwImport;
else if (0 == strcmp(s, "cdef"))
kwLast = kwCDef;
else if (0 == strcmp(s, "cpdef"))
kwLast = kwCPDef;
else if (0 == strcmp(s, "cimport"))
kwLast = kwImport;
else if (kwLast != kwCDef && kwLast != kwCPDef)
kwLast = kwOther;
} else if (kwLast != kwCDef && kwLast != kwCPDef) {
kwLast = kwOther;
}
}
} else if ((sc.state == SCE_P_COMMENTLINE) || (sc.state == SCE_P_COMMENTBLOCK)) {
if (sc.ch == '\r' || sc.ch == '\n') {
sc.SetState(SCE_P_DEFAULT);
}
} else if (sc.state == SCE_P_DECORATOR) {
if (!IsAWordStart(sc.ch, options.unicodeIdentifiers)) {
sc.SetState(SCE_P_DEFAULT);
}
} else if (IsPySingleQuoteStringState(sc.state)) {
if (sc.ch == '\\') {
if ((sc.chNext == '\r') && (sc.GetRelative(2) == '\n')) {
sc.Forward();
}
if (sc.chNext == '\n' || sc.chNext == '\r') {
inContinuedString = true;
} else {
// Don't roll over the newline.
sc.Forward();
}
} else if (sc.ch == GetPyStringQuoteChar(sc.state)) {
sc.ForwardSetState(SCE_P_DEFAULT);
needEOLCheck = true;
}
} else if ((sc.state == SCE_P_TRIPLE) || (sc.state == SCE_P_FTRIPLE)) {
if (sc.ch == '\\') {
sc.Forward();
} else if (sc.Match(R"(''')")) {
sc.Forward();
sc.Forward();
sc.ForwardSetState(SCE_P_DEFAULT);
needEOLCheck = true;
}
} else if ((sc.state == SCE_P_TRIPLEDOUBLE) || (sc.state == SCE_P_FTRIPLEDOUBLE)) {
if (sc.ch == '\\') {
sc.Forward();
} else if (sc.Match(R"(""")")) {
sc.Forward();
sc.Forward();
sc.ForwardSetState(SCE_P_DEFAULT);
needEOLCheck = true;
}
}
// Note if used and not if else because string states also match
// some of the above clauses
if (IsPyFStringState(sc.state) && sc.ch == '{') {
if (sc.chNext == '{') {
sc.Forward();
} else {
PushStateToStack(sc.state, fstringStateStack, currentFStringExp);
sc.ForwardSetState(SCE_P_DEFAULT);
}
needEOLCheck = true;
}
// If in an f-string expression, check for the ending quote(s)
// and end f-string to handle syntactically incorrect cases like
// f'{' and f"""{"""
if (!fstringStateStack.empty() && (sc.ch == '\'' || sc.ch == '"')) {
long matching_stack_i = -1;
for (unsigned long stack_i = 0; stack_i < fstringStateStack.size() && matching_stack_i == -1; stack_i++) {
const int stack_state = fstringStateStack[stack_i].state;
const char quote = GetPyStringQuoteChar(stack_state);
if (sc.ch == quote) {
if (IsPySingleQuoteStringState(stack_state)) {
matching_stack_i = stack_i;
} else if (quote == '"' ? sc.Match(R"(""")") : sc.Match("'''")) {
matching_stack_i = stack_i;
}
}
}
if (matching_stack_i != -1) {
sc.SetState(fstringStateStack[matching_stack_i].state);
if (IsPyTripleQuoteStringState(fstringStateStack[matching_stack_i].state)) {
sc.Forward();
sc.Forward();
}
sc.ForwardSetState(SCE_P_DEFAULT);
needEOLCheck = true;
while (fstringStateStack.size() > static_cast<unsigned long>(matching_stack_i)) {
PopFromStateStack(fstringStateStack, currentFStringExp);
}
}
}
// End of code to find the end of a state
if (!indentGood && !IsASpaceOrTab(sc.ch)) {
styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 1);
startIndicator = sc.currentPos;
indentGood = true;
}
// One cdef or cpdef line, clear kwLast only at end of line
if ((kwLast == kwCDef || kwLast == kwCPDef) && sc.atLineEnd) {
kwLast = kwOther;
}
// State exit code may have moved on to end of line
if (needEOLCheck && sc.atLineEnd) {
ProcessLineEnd(sc, fstringStateStack, currentFStringExp, inContinuedString);
lineCurrent++;
styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
if (!sc.More())
break;
}
// If in f-string expression, check for }, :, ! to resume f-string state or update nesting count
if (currentFStringExp && !IsPySingleQuoteStringState(sc.state) && !IsPyTripleQuoteStringState(sc.state)) {
if (currentFStringExp->nestingCount == 0 && (sc.ch == '}' || sc.ch == ':' || (sc.ch == '!' && sc.chNext != '='))) {
sc.SetState(PopFromStateStack(fstringStateStack, currentFStringExp));
} else {
if (sc.ch == '{' || sc.ch == '[' || sc.ch == '(') {
currentFStringExp->nestingCount++;
} else if (sc.ch == '}' || sc.ch == ']' || sc.ch == ')') {
currentFStringExp->nestingCount--;
}
}
}
// Check for a new state starting character
if (sc.state == SCE_P_DEFAULT) {
if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
if (sc.ch == '0' && (sc.chNext == 'x' || sc.chNext == 'X')) {
base_n_number = true;
sc.SetState(SCE_P_NUMBER);
} else if (sc.ch == '0' &&
(sc.chNext == 'o' || sc.chNext == 'O' || sc.chNext == 'b' || sc.chNext == 'B')) {
if (options.base2or8Literals) {
base_n_number = true;
sc.SetState(SCE_P_NUMBER);
} else {
sc.SetState(SCE_P_NUMBER);
sc.ForwardSetState(SCE_P_IDENTIFIER);
}
} else {
base_n_number = false;
sc.SetState(SCE_P_NUMBER);
}
} else if (isoperator(sc.ch) || sc.ch == '`') {
sc.SetState(SCE_P_OPERATOR);
} else if (sc.ch == '#') {
sc.SetState(sc.chNext == '#' ? SCE_P_COMMENTBLOCK : SCE_P_COMMENTLINE);
} else if (sc.ch == '@') {
if (IsFirstNonWhitespace(sc.currentPos, styler))
sc.SetState(SCE_P_DECORATOR);
else
sc.SetState(SCE_P_OPERATOR);
} else if (IsPyStringStart(sc.ch, sc.chNext, sc.GetRelative(2), allowedLiterals)) {
Sci_PositionU nextIndex = 0;
sc.SetState(GetPyStringState(styler, sc.currentPos, &nextIndex, allowedLiterals));
while (nextIndex > (sc.currentPos + 1) && sc.More()) {
sc.Forward();
}
} else if (IsAWordStart(sc.ch, options.unicodeIdentifiers)) {
sc.SetState(SCE_P_IDENTIFIER);
}
}
}
styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 0);
sc.Complete();
}
static bool IsCommentLine(Sci_Position line, Accessor &styler) {
const Sci_Position pos = styler.LineStart(line);
const Sci_Position eol_pos = styler.LineStart(line + 1) - 1;
for (Sci_Position i = pos; i < eol_pos; i++) {
const char ch = styler[i];
if (ch == '#')
return true;
else if (ch != ' ' && ch != '\t')
return false;
}
return false;
}
static bool IsQuoteLine(Sci_Position line, const Accessor &styler) {
const int style = styler.StyleAt(styler.LineStart(line)) & 31;
return IsPyTripleQuoteStringState(style);
}
void SCI_METHOD LexerPython::Fold(Sci_PositionU startPos, Sci_Position length, int /*initStyle - unused*/, IDocument *pAccess) {
if (!options.fold)
return;
Accessor styler(pAccess, nullptr);
const Sci_Position maxPos = startPos + length;
const Sci_Position maxLines = (maxPos == styler.Length()) ? styler.GetLine(maxPos) : styler.GetLine(maxPos - 1); // Requested last line
const Sci_Position docLines = styler.GetLine(styler.Length()); // Available last line
// Backtrack to previous non-blank line so we can determine indent level
// for any white space lines (needed esp. within triple quoted strings)
// and so we can fix any preceding fold level (which is why we go back
// at least one line in all cases)
int spaceFlags = 0;
Sci_Position lineCurrent = styler.GetLine(startPos);
int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, nullptr);
while (lineCurrent > 0) {
lineCurrent--;
indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, nullptr);
if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG) &&
(!IsCommentLine(lineCurrent, styler)) &&
(!IsQuoteLine(lineCurrent, styler)))
break;
}
int indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
// Set up initial loop state
startPos = styler.LineStart(lineCurrent);
int prev_state = SCE_P_DEFAULT & 31;
if (lineCurrent >= 1)
prev_state = styler.StyleAt(startPos - 1) & 31;
int prevQuote = options.foldQuotes && IsPyTripleQuoteStringState(prev_state);
// Process all characters to end of requested range or end of any triple quote
//that hangs over the end of the range. Cap processing in all cases
// to end of document (in case of unclosed quote at end).
while ((lineCurrent <= docLines) && ((lineCurrent <= maxLines) || prevQuote)) {
// Gather info
int lev = indentCurrent;
Sci_Position lineNext = lineCurrent + 1;
int indentNext = indentCurrent;
int quote = false;
if (lineNext <= docLines) {
// Information about next line is only available if not at end of document
indentNext = styler.IndentAmount(lineNext, &spaceFlags, nullptr);
const Sci_Position lookAtPos = (styler.LineStart(lineNext) == styler.Length()) ? styler.Length() - 1 : styler.LineStart(lineNext);
const int style = styler.StyleAt(lookAtPos) & 31;
quote = options.foldQuotes && IsPyTripleQuoteStringState(style);
}
const bool quote_start = (quote && !prevQuote);
const bool quote_continue = (quote && prevQuote);
if (!quote || !prevQuote)
indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
if (quote)
indentNext = indentCurrentLevel;
if (indentNext & SC_FOLDLEVELWHITEFLAG)
indentNext = SC_FOLDLEVELWHITEFLAG | indentCurrentLevel;
if (quote_start) {
// Place fold point at start of triple quoted string
lev |= SC_FOLDLEVELHEADERFLAG;
} else if (quote_continue || prevQuote) {
// Add level to rest of lines in the string
lev = lev + 1;
}
// Skip past any blank lines for next indent level info; we skip also
// comments (all comments, not just those starting in column 0)
// which effectively folds them into surrounding code rather
// than screwing up folding. If comments end file, use the min
// comment indent as the level after
int minCommentLevel = indentCurrentLevel;
while (!quote &&
(lineNext < docLines) &&
((indentNext & SC_FOLDLEVELWHITEFLAG) || (IsCommentLine(lineNext, styler)))) {
if (IsCommentLine(lineNext, styler) && indentNext < minCommentLevel) {
minCommentLevel = indentNext;
}
lineNext++;
indentNext = styler.IndentAmount(lineNext, &spaceFlags, nullptr);
}
const int levelAfterComments = ((lineNext < docLines) ? indentNext & SC_FOLDLEVELNUMBERMASK : minCommentLevel);
const int levelBeforeComments = std::max(indentCurrentLevel, levelAfterComments);
// Now set all the indent levels on the lines we skipped
// Do this from end to start. Once we encounter one line
// which is indented more than the line after the end of
// the comment-block, use the level of the block before
Sci_Position skipLine = lineNext;
int skipLevel = levelAfterComments;
while (--skipLine > lineCurrent) {
const int skipLineIndent = styler.IndentAmount(skipLine, &spaceFlags, nullptr);
if (options.foldCompact) {
if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments)
skipLevel = levelBeforeComments;
const int whiteFlag = skipLineIndent & SC_FOLDLEVELWHITEFLAG;
styler.SetLevel(skipLine, skipLevel | whiteFlag);
} else {
if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments &&
!(skipLineIndent & SC_FOLDLEVELWHITEFLAG) &&
!IsCommentLine(skipLine, styler))
skipLevel = levelBeforeComments;
styler.SetLevel(skipLine, skipLevel);
}
}
// Set fold header on non-quote line
if (!quote && !(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK))
lev |= SC_FOLDLEVELHEADERFLAG;
}
// Keep track of triple quote state of previous line
prevQuote = quote;
// Set fold level for this line and move to next line
styler.SetLevel(lineCurrent, options.foldCompact ? lev : lev & ~SC_FOLDLEVELWHITEFLAG);
indentCurrent = indentNext;
lineCurrent = lineNext;
}
// NOTE: Cannot set level of last line here because indentCurrent doesn't have
// header flag set; the loop above is crafted to take care of this case!
//styler.SetLevel(lineCurrent, indentCurrent);
}
LexerModule lmPython(SCLEX_PYTHON, LexerPython::LexerFactoryPython, "python",
pythonWordListDesc);
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