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-/** @file LexRust.cxx
- ** Lexer for Rust.
- **
- ** Copyright (c) 2013 by SiegeLord <slabode@aim.com>
- ** Converted to lexer object and added further folding features/properties 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 <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <assert.h>
-#include <ctype.h>
-
-#include <string>
-#include <map>
-
-#include "ILexer.h"
-#include "Scintilla.h"
-#include "SciLexer.h"
-
-#include "PropSetSimple.h"
-#include "WordList.h"
-#include "LexAccessor.h"
-#include "Accessor.h"
-#include "StyleContext.h"
-#include "CharacterSet.h"
-#include "LexerModule.h"
-#include "OptionSet.h"
-#include "DefaultLexer.h"
-
-using namespace Scintilla;
-
-static const int NUM_RUST_KEYWORD_LISTS = 7;
-static const int MAX_RUST_IDENT_CHARS = 1023;
-
-static bool IsStreamCommentStyle(int style) {
- return style == SCE_RUST_COMMENTBLOCK ||
- style == SCE_RUST_COMMENTBLOCKDOC;
-}
-
-// Options used for LexerRust
-struct OptionsRust {
- bool fold;
- bool foldSyntaxBased;
- bool foldComment;
- bool foldCommentMultiline;
- bool foldCommentExplicit;
- std::string foldExplicitStart;
- std::string foldExplicitEnd;
- bool foldExplicitAnywhere;
- bool foldCompact;
- int foldAtElseInt;
- bool foldAtElse;
- OptionsRust() {
- fold = false;
- foldSyntaxBased = true;
- foldComment = false;
- foldCommentMultiline = true;
- foldCommentExplicit = true;
- foldExplicitStart = "";
- foldExplicitEnd = "";
- foldExplicitAnywhere = false;
- foldCompact = true;
- foldAtElseInt = -1;
- foldAtElse = false;
- }
-};
-
-static const char * const rustWordLists[NUM_RUST_KEYWORD_LISTS + 1] = {
- "Primary keywords and identifiers",
- "Built in types",
- "Other keywords",
- "Keywords 4",
- "Keywords 5",
- "Keywords 6",
- "Keywords 7",
- 0,
- };
-
-struct OptionSetRust : public OptionSet<OptionsRust> {
- OptionSetRust() {
- DefineProperty("fold", &OptionsRust::fold);
-
- DefineProperty("fold.comment", &OptionsRust::foldComment);
-
- DefineProperty("fold.compact", &OptionsRust::foldCompact);
-
- DefineProperty("fold.at.else", &OptionsRust::foldAtElse);
-
- DefineProperty("fold.rust.syntax.based", &OptionsRust::foldSyntaxBased,
- "Set this property to 0 to disable syntax based folding.");
-
- DefineProperty("fold.rust.comment.multiline", &OptionsRust::foldCommentMultiline,
- "Set this property to 0 to disable folding multi-line comments when fold.comment=1.");
-
- DefineProperty("fold.rust.comment.explicit", &OptionsRust::foldCommentExplicit,
- "Set this property to 0 to disable folding explicit fold points when fold.comment=1.");
-
- DefineProperty("fold.rust.explicit.start", &OptionsRust::foldExplicitStart,
- "The string to use for explicit fold start points, replacing the standard //{.");
-
- DefineProperty("fold.rust.explicit.end", &OptionsRust::foldExplicitEnd,
- "The string to use for explicit fold end points, replacing the standard //}.");
-
- DefineProperty("fold.rust.explicit.anywhere", &OptionsRust::foldExplicitAnywhere,
- "Set this property to 1 to enable explicit fold points anywhere, not just in line comments.");
-
- DefineProperty("lexer.rust.fold.at.else", &OptionsRust::foldAtElseInt,
- "This option enables Rust folding on a \"} else {\" line of an if statement.");
-
- DefineWordListSets(rustWordLists);
- }
-};
-
-class LexerRust : public DefaultLexer {
- WordList keywords[NUM_RUST_KEYWORD_LISTS];
- OptionsRust options;
- OptionSetRust osRust;
-public:
- LexerRust() : DefaultLexer("rust", SCLEX_RUST) {
- }
- virtual ~LexerRust() {
- }
- void SCI_METHOD Release() override {
- delete this;
- }
- int SCI_METHOD Version() const override {
- return lvRelease5;
- }
- const char * SCI_METHOD PropertyNames() override {
- return osRust.PropertyNames();
- }
- int SCI_METHOD PropertyType(const char *name) override {
- return osRust.PropertyType(name);
- }
- const char * SCI_METHOD DescribeProperty(const char *name) override {
- return osRust.DescribeProperty(name);
- }
- Sci_Position SCI_METHOD PropertySet(const char *key, const char *val) override;
- const char * SCI_METHOD PropertyGet(const char *key) override {
- return osRust.PropertyGet(key);
- }
- const char * SCI_METHOD DescribeWordListSets() override {
- return osRust.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 0;
- }
- static ILexer5 *LexerFactoryRust() {
- return new LexerRust();
- }
-};
-
-Sci_Position SCI_METHOD LexerRust::PropertySet(const char *key, const char *val) {
- if (osRust.PropertySet(&options, key, val)) {
- return 0;
- }
- return -1;
-}
-
-Sci_Position SCI_METHOD LexerRust::WordListSet(int n, const char *wl) {
- Sci_Position firstModification = -1;
- if (n < NUM_RUST_KEYWORD_LISTS) {
- WordList *wordListN = &keywords[n];
- WordList wlNew;
- wlNew.Set(wl);
- if (*wordListN != wlNew) {
- wordListN->Set(wl);
- firstModification = 0;
- }
- }
- return firstModification;
-}
-
-static bool IsWhitespace(int c) {
- return c == ' ' || c == '\t' || c == '\r' || c == '\n';
-}
-
-/* This isn't quite right for Unicode identifiers */
-static bool IsIdentifierStart(int ch) {
- return (IsASCII(ch) && (isalpha(ch) || ch == '_')) || !IsASCII(ch);
-}
-
-/* This isn't quite right for Unicode identifiers */
-static bool IsIdentifierContinue(int ch) {
- return (IsASCII(ch) && (isalnum(ch) || ch == '_')) || !IsASCII(ch);
-}
-
-static void ScanWhitespace(Accessor& styler, Sci_Position& pos, Sci_Position max) {
- while (IsWhitespace(styler.SafeGetCharAt(pos, '\0')) && pos < max) {
- if (pos == styler.LineEnd(styler.GetLine(pos)))
- styler.SetLineState(styler.GetLine(pos), 0);
- pos++;
- }
- styler.ColourTo(pos-1, SCE_RUST_DEFAULT);
-}
-
-static void GrabString(char* s, Accessor& styler, Sci_Position start, Sci_Position len) {
- for (Sci_Position ii = 0; ii < len; ii++)
- s[ii] = styler[ii + start];
- s[len] = '\0';
-}
-
-static void ScanIdentifier(Accessor& styler, Sci_Position& pos, WordList *keywords) {
- Sci_Position start = pos;
- while (IsIdentifierContinue(styler.SafeGetCharAt(pos, '\0')))
- pos++;
-
- if (styler.SafeGetCharAt(pos, '\0') == '!') {
- pos++;
- styler.ColourTo(pos - 1, SCE_RUST_MACRO);
- } else {
- char s[MAX_RUST_IDENT_CHARS + 1];
- Sci_Position len = pos - start;
- len = len > MAX_RUST_IDENT_CHARS ? MAX_RUST_IDENT_CHARS : len;
- GrabString(s, styler, start, len);
- bool keyword = false;
- for (int ii = 0; ii < NUM_RUST_KEYWORD_LISTS; ii++) {
- if (keywords[ii].InList(s)) {
- styler.ColourTo(pos - 1, SCE_RUST_WORD + ii);
- keyword = true;
- break;
- }
- }
- if (!keyword) {
- styler.ColourTo(pos - 1, SCE_RUST_IDENTIFIER);
- }
- }
-}
-
-/* Scans a sequence of digits, returning true if it found any. */
-static bool ScanDigits(Accessor& styler, Sci_Position& pos, int base) {
- Sci_Position old_pos = pos;
- for (;;) {
- int c = styler.SafeGetCharAt(pos, '\0');
- if (IsADigit(c, base) || c == '_')
- pos++;
- else
- break;
- }
- return old_pos != pos;
-}
-
-/* Scans an integer and floating point literals. */
-static void ScanNumber(Accessor& styler, Sci_Position& pos) {
- int base = 10;
- int c = styler.SafeGetCharAt(pos, '\0');
- int n = styler.SafeGetCharAt(pos + 1, '\0');
- bool error = false;
- /* Scan the prefix, thus determining the base.
- * 10 is default if there's no prefix. */
- if (c == '0' && n == 'x') {
- pos += 2;
- base = 16;
- } else if (c == '0' && n == 'b') {
- pos += 2;
- base = 2;
- } else if (c == '0' && n == 'o') {
- pos += 2;
- base = 8;
- }
-
- /* Scan initial digits. The literal is malformed if there are none. */
- error |= !ScanDigits(styler, pos, base);
- /* See if there's an integer suffix. We mimic the Rust's lexer
- * and munch it even if there was an error above. */
- c = styler.SafeGetCharAt(pos, '\0');
- if (c == 'u' || c == 'i') {
- pos++;
- c = styler.SafeGetCharAt(pos, '\0');
- n = styler.SafeGetCharAt(pos + 1, '\0');
- if (c == '8') {
- pos++;
- } else if (c == '1' && n == '6') {
- pos += 2;
- } else if (c == '3' && n == '2') {
- pos += 2;
- } else if (c == '6' && n == '4') {
- pos += 2;
- } else if (styler.Match(pos, "size")) {
- pos += 4;
- } else {
- error = true;
- }
- /* See if it's a floating point literal. These literals have to be base 10.
- */
- } else if (!error) {
- /* If there's a period, it's a floating point literal unless it's
- * followed by an identifier (meaning this is a method call, e.g.
- * `1.foo()`) or another period, in which case it's a range (e.g. 1..2)
- */
- n = styler.SafeGetCharAt(pos + 1, '\0');
- if (c == '.' && !(IsIdentifierStart(n) || n == '.')) {
- error |= base != 10;
- pos++;
- /* It's ok to have no digits after the period. */
- ScanDigits(styler, pos, 10);
- }
-
- /* Look for the exponentiation. */
- c = styler.SafeGetCharAt(pos, '\0');
- if (c == 'e' || c == 'E') {
- error |= base != 10;
- pos++;
- c = styler.SafeGetCharAt(pos, '\0');
- if (c == '-' || c == '+')
- pos++;
- /* It is invalid to have no digits in the exponent. */
- error |= !ScanDigits(styler, pos, 10);
- }
-
- /* Scan the floating point suffix. */
- c = styler.SafeGetCharAt(pos, '\0');
- if (c == 'f') {
- error |= base != 10;
- pos++;
- c = styler.SafeGetCharAt(pos, '\0');
- n = styler.SafeGetCharAt(pos + 1, '\0');
- if (c == '3' && n == '2') {
- pos += 2;
- } else if (c == '6' && n == '4') {
- pos += 2;
- } else {
- error = true;
- }
- }
- }
-
- if (error)
- styler.ColourTo(pos - 1, SCE_RUST_LEXERROR);
- else
- styler.ColourTo(pos - 1, SCE_RUST_NUMBER);
-}
-
-static bool IsOneCharOperator(int c) {
- return c == ';' || c == ',' || c == '(' || c == ')'
- || c == '{' || c == '}' || c == '[' || c == ']'
- || c == '@' || c == '#' || c == '~' || c == '+'
- || c == '*' || c == '/' || c == '^' || c == '%'
- || c == '.' || c == ':' || c == '!' || c == '<'
- || c == '>' || c == '=' || c == '-' || c == '&'
- || c == '|' || c == '$' || c == '?';
-}
-
-static bool IsTwoCharOperator(int c, int n) {
- return (c == '.' && n == '.') || (c == ':' && n == ':')
- || (c == '!' && n == '=') || (c == '<' && n == '<')
- || (c == '<' && n == '=') || (c == '>' && n == '>')
- || (c == '>' && n == '=') || (c == '=' && n == '=')
- || (c == '=' && n == '>') || (c == '-' && n == '>')
- || (c == '&' && n == '&') || (c == '|' && n == '|')
- || (c == '-' && n == '=') || (c == '&' && n == '=')
- || (c == '|' && n == '=') || (c == '+' && n == '=')
- || (c == '*' && n == '=') || (c == '/' && n == '=')
- || (c == '^' && n == '=') || (c == '%' && n == '=');
-}
-
-static bool IsThreeCharOperator(int c, int n, int n2) {
- return (c == '<' && n == '<' && n2 == '=')
- || (c == '>' && n == '>' && n2 == '=');
-}
-
-static bool IsValidCharacterEscape(int c) {
- return c == 'n' || c == 'r' || c == 't' || c == '\\'
- || c == '\'' || c == '"' || c == '0';
-}
-
-static bool IsValidStringEscape(int c) {
- return IsValidCharacterEscape(c) || c == '\n' || c == '\r';
-}
-
-static bool ScanNumericEscape(Accessor &styler, Sci_Position& pos, Sci_Position num_digits, bool stop_asap) {
- for (;;) {
- int c = styler.SafeGetCharAt(pos, '\0');
- if (!IsADigit(c, 16))
- break;
- num_digits--;
- pos++;
- if (num_digits == 0 && stop_asap)
- return true;
- }
- if (num_digits == 0) {
- return true;
- } else {
- return false;
- }
-}
-
-/* This is overly permissive for character literals in order to accept UTF-8 encoded
- * character literals. */
-static void ScanCharacterLiteralOrLifetime(Accessor &styler, Sci_Position& pos, bool ascii_only) {
- pos++;
- int c = styler.SafeGetCharAt(pos, '\0');
- int n = styler.SafeGetCharAt(pos + 1, '\0');
- bool done = false;
- bool valid_lifetime = !ascii_only && IsIdentifierStart(c);
- bool valid_char = true;
- bool first = true;
- while (!done) {
- switch (c) {
- case '\\':
- done = true;
- if (IsValidCharacterEscape(n)) {
- pos += 2;
- } else if (n == 'x') {
- pos += 2;
- valid_char = ScanNumericEscape(styler, pos, 2, false);
- } else if (n == 'u' && !ascii_only) {
- pos += 2;
- if (styler.SafeGetCharAt(pos, '\0') != '{') {
- // old-style
- valid_char = ScanNumericEscape(styler, pos, 4, false);
- } else {
- int n_digits = 0;
- while (IsADigit(styler.SafeGetCharAt(++pos, '\0'), 16) && n_digits++ < 6) {
- }
- if (n_digits > 0 && styler.SafeGetCharAt(pos, '\0') == '}')
- pos++;
- else
- valid_char = false;
- }
- } else if (n == 'U' && !ascii_only) {
- pos += 2;
- valid_char = ScanNumericEscape(styler, pos, 8, false);
- } else {
- valid_char = false;
- }
- break;
- case '\'':
- valid_char = !first;
- done = true;
- break;
- case '\t':
- case '\n':
- case '\r':
- case '\0':
- valid_char = false;
- done = true;
- break;
- default:
- if (ascii_only && !IsASCII((char)c)) {
- done = true;
- valid_char = false;
- } else if (!IsIdentifierContinue(c) && !first) {
- done = true;
- } else {
- pos++;
- }
- break;
- }
- c = styler.SafeGetCharAt(pos, '\0');
- n = styler.SafeGetCharAt(pos + 1, '\0');
-
- first = false;
- }
- if (styler.SafeGetCharAt(pos, '\0') == '\'') {
- valid_lifetime = false;
- } else {
- valid_char = false;
- }
- if (valid_lifetime) {
- styler.ColourTo(pos - 1, SCE_RUST_LIFETIME);
- } else if (valid_char) {
- pos++;
- styler.ColourTo(pos - 1, ascii_only ? SCE_RUST_BYTECHARACTER : SCE_RUST_CHARACTER);
- } else {
- styler.ColourTo(pos - 1, SCE_RUST_LEXERROR);
- }
-}
-
-enum CommentState {
- UnknownComment,
- DocComment,
- NotDocComment
-};
-
-/*
- * The rule for block-doc comments is as follows: /xxN and /x! (where x is an asterisk, N is a non-asterisk) start doc comments.
- * Otherwise it's a regular comment.
- */
-static void ResumeBlockComment(Accessor &styler, Sci_Position& pos, Sci_Position max, CommentState state, int level) {
- int c = styler.SafeGetCharAt(pos, '\0');
- bool maybe_doc_comment = false;
- if (c == '*') {
- int n = styler.SafeGetCharAt(pos + 1, '\0');
- if (n != '*' && n != '/') {
- maybe_doc_comment = true;
- }
- } else if (c == '!') {
- maybe_doc_comment = true;
- }
-
- for (;;) {
- int n = styler.SafeGetCharAt(pos + 1, '\0');
- if (pos == styler.LineEnd(styler.GetLine(pos)))
- styler.SetLineState(styler.GetLine(pos), level);
- if (c == '*') {
- pos++;
- if (n == '/') {
- pos++;
- level--;
- if (level == 0) {
- styler.SetLineState(styler.GetLine(pos), 0);
- if (state == DocComment || (state == UnknownComment && maybe_doc_comment))
- styler.ColourTo(pos - 1, SCE_RUST_COMMENTBLOCKDOC);
- else
- styler.ColourTo(pos - 1, SCE_RUST_COMMENTBLOCK);
- break;
- }
- }
- } else if (c == '/') {
- pos++;
- if (n == '*') {
- pos++;
- level++;
- }
- }
- else {
- pos++;
- }
- if (pos >= max) {
- if (state == DocComment || (state == UnknownComment && maybe_doc_comment))
- styler.ColourTo(pos - 1, SCE_RUST_COMMENTBLOCKDOC);
- else
- styler.ColourTo(pos - 1, SCE_RUST_COMMENTBLOCK);
- break;
- }
- c = styler.SafeGetCharAt(pos, '\0');
- }
-}
-
-/*
- * The rule for line-doc comments is as follows... ///N and //! (where N is a non slash) start doc comments.
- * Otherwise it's a normal line comment.
- */
-static void ResumeLineComment(Accessor &styler, Sci_Position& pos, Sci_Position max, CommentState state) {
- bool maybe_doc_comment = false;
- int c = styler.SafeGetCharAt(pos, '\0');
- if (c == '/') {
- if (pos < max) {
- pos++;
- c = styler.SafeGetCharAt(pos, '\0');
- if (c != '/') {
- maybe_doc_comment = true;
- }
- }
- } else if (c == '!') {
- maybe_doc_comment = true;
- }
-
- while (pos < max && c != '\n') {
- if (pos == styler.LineEnd(styler.GetLine(pos)))
- styler.SetLineState(styler.GetLine(pos), 0);
- pos++;
- c = styler.SafeGetCharAt(pos, '\0');
- }
-
- if (state == DocComment || (state == UnknownComment && maybe_doc_comment))
- styler.ColourTo(pos - 1, SCE_RUST_COMMENTLINEDOC);
- else
- styler.ColourTo(pos - 1, SCE_RUST_COMMENTLINE);
-}
-
-static void ScanComments(Accessor &styler, Sci_Position& pos, Sci_Position max) {
- pos++;
- int c = styler.SafeGetCharAt(pos, '\0');
- pos++;
- if (c == '/')
- ResumeLineComment(styler, pos, max, UnknownComment);
- else if (c == '*')
- ResumeBlockComment(styler, pos, max, UnknownComment, 1);
-}
-
-static void ResumeString(Accessor &styler, Sci_Position& pos, Sci_Position max, bool ascii_only) {
- int c = styler.SafeGetCharAt(pos, '\0');
- bool error = false;
- while (c != '"' && !error) {
- if (pos >= max) {
- error = true;
- break;
- }
- if (pos == styler.LineEnd(styler.GetLine(pos)))
- styler.SetLineState(styler.GetLine(pos), 0);
- if (c == '\\') {
- int n = styler.SafeGetCharAt(pos + 1, '\0');
- if (IsValidStringEscape(n)) {
- pos += 2;
- } else if (n == 'x') {
- pos += 2;
- error = !ScanNumericEscape(styler, pos, 2, true);
- } else if (n == 'u' && !ascii_only) {
- pos += 2;
- if (styler.SafeGetCharAt(pos, '\0') != '{') {
- // old-style
- error = !ScanNumericEscape(styler, pos, 4, true);
- } else {
- int n_digits = 0;
- while (IsADigit(styler.SafeGetCharAt(++pos, '\0'), 16) && n_digits++ < 6) {
- }
- if (n_digits > 0 && styler.SafeGetCharAt(pos, '\0') == '}')
- pos++;
- else
- error = true;
- }
- } else if (n == 'U' && !ascii_only) {
- pos += 2;
- error = !ScanNumericEscape(styler, pos, 8, true);
- } else {
- pos += 1;
- error = true;
- }
- } else {
- if (ascii_only && !IsASCII((char)c))
- error = true;
- else
- pos++;
- }
- c = styler.SafeGetCharAt(pos, '\0');
- }
- if (!error)
- pos++;
- styler.ColourTo(pos - 1, ascii_only ? SCE_RUST_BYTESTRING : SCE_RUST_STRING);
-}
-
-static void ResumeRawString(Accessor &styler, Sci_Position& pos, Sci_Position max, int num_hashes, bool ascii_only) {
- for (;;) {
- if (pos == styler.LineEnd(styler.GetLine(pos)))
- styler.SetLineState(styler.GetLine(pos), num_hashes);
-
- int c = styler.SafeGetCharAt(pos, '\0');
- if (c == '"') {
- pos++;
- int trailing_num_hashes = 0;
- while (styler.SafeGetCharAt(pos, '\0') == '#' && trailing_num_hashes < num_hashes) {
- trailing_num_hashes++;
- pos++;
- }
- if (trailing_num_hashes == num_hashes) {
- styler.SetLineState(styler.GetLine(pos), 0);
- break;
- }
- } else if (pos >= max) {
- break;
- } else {
- if (ascii_only && !IsASCII((char)c))
- break;
- pos++;
- }
- }
- styler.ColourTo(pos - 1, ascii_only ? SCE_RUST_BYTESTRINGR : SCE_RUST_STRINGR);
-}
-
-static void ScanRawString(Accessor &styler, Sci_Position& pos, Sci_Position max, bool ascii_only) {
- pos++;
- int num_hashes = 0;
- while (styler.SafeGetCharAt(pos, '\0') == '#') {
- num_hashes++;
- pos++;
- }
- if (styler.SafeGetCharAt(pos, '\0') != '"') {
- styler.ColourTo(pos - 1, SCE_RUST_LEXERROR);
- } else {
- pos++;
- ResumeRawString(styler, pos, max, num_hashes, ascii_only);
- }
-}
-
-void SCI_METHOD LexerRust::Lex(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) {
- PropSetSimple props;
- Accessor styler(pAccess, &props);
- Sci_Position pos = startPos;
- Sci_Position max = pos + length;
-
- styler.StartAt(pos);
- styler.StartSegment(pos);
-
- if (initStyle == SCE_RUST_COMMENTBLOCK || initStyle == SCE_RUST_COMMENTBLOCKDOC) {
- ResumeBlockComment(styler, pos, max, initStyle == SCE_RUST_COMMENTBLOCKDOC ? DocComment : NotDocComment, styler.GetLineState(styler.GetLine(pos) - 1));
- } else if (initStyle == SCE_RUST_COMMENTLINE || initStyle == SCE_RUST_COMMENTLINEDOC) {
- ResumeLineComment(styler, pos, max, initStyle == SCE_RUST_COMMENTLINEDOC ? DocComment : NotDocComment);
- } else if (initStyle == SCE_RUST_STRING) {
- ResumeString(styler, pos, max, false);
- } else if (initStyle == SCE_RUST_BYTESTRING) {
- ResumeString(styler, pos, max, true);
- } else if (initStyle == SCE_RUST_STRINGR) {
- ResumeRawString(styler, pos, max, styler.GetLineState(styler.GetLine(pos) - 1), false);
- } else if (initStyle == SCE_RUST_BYTESTRINGR) {
- ResumeRawString(styler, pos, max, styler.GetLineState(styler.GetLine(pos) - 1), true);
- }
-
- while (pos < max) {
- int c = styler.SafeGetCharAt(pos, '\0');
- int n = styler.SafeGetCharAt(pos + 1, '\0');
- int n2 = styler.SafeGetCharAt(pos + 2, '\0');
-
- if (pos == 0 && c == '#' && n == '!' && n2 != '[') {
- pos += 2;
- ResumeLineComment(styler, pos, max, NotDocComment);
- } else if (IsWhitespace(c)) {
- ScanWhitespace(styler, pos, max);
- } else if (c == '/' && (n == '/' || n == '*')) {
- ScanComments(styler, pos, max);
- } else if (c == 'r' && (n == '#' || n == '"')) {
- ScanRawString(styler, pos, max, false);
- } else if (c == 'b' && n == 'r' && (n2 == '#' || n2 == '"')) {
- pos++;
- ScanRawString(styler, pos, max, true);
- } else if (c == 'b' && n == '"') {
- pos += 2;
- ResumeString(styler, pos, max, true);
- } else if (c == 'b' && n == '\'') {
- pos++;
- ScanCharacterLiteralOrLifetime(styler, pos, true);
- } else if (IsIdentifierStart(c)) {
- ScanIdentifier(styler, pos, keywords);
- } else if (IsADigit(c)) {
- ScanNumber(styler, pos);
- } else if (IsThreeCharOperator(c, n, n2)) {
- pos += 3;
- styler.ColourTo(pos - 1, SCE_RUST_OPERATOR);
- } else if (IsTwoCharOperator(c, n)) {
- pos += 2;
- styler.ColourTo(pos - 1, SCE_RUST_OPERATOR);
- } else if (IsOneCharOperator(c)) {
- pos++;
- styler.ColourTo(pos - 1, SCE_RUST_OPERATOR);
- } else if (c == '\'') {
- ScanCharacterLiteralOrLifetime(styler, pos, false);
- } else if (c == '"') {
- pos++;
- ResumeString(styler, pos, max, false);
- } else {
- pos++;
- styler.ColourTo(pos - 1, SCE_RUST_LEXERROR);
- }
- }
- styler.ColourTo(pos - 1, SCE_RUST_DEFAULT);
- styler.Flush();
-}
-
-void SCI_METHOD LexerRust::Fold(Sci_PositionU startPos, Sci_Position length, int initStyle, IDocument *pAccess) {
-
- if (!options.fold)
- return;
-
- LexAccessor styler(pAccess);
-
- Sci_PositionU endPos = startPos + length;
- int visibleChars = 0;
- bool inLineComment = false;
- Sci_Position lineCurrent = styler.GetLine(startPos);
- int levelCurrent = SC_FOLDLEVELBASE;
- if (lineCurrent > 0)
- levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
- Sci_PositionU lineStartNext = styler.LineStart(lineCurrent+1);
- int levelMinCurrent = levelCurrent;
- int levelNext = levelCurrent;
- char chNext = styler[startPos];
- int styleNext = styler.StyleAt(startPos);
- int style = initStyle;
- const bool userDefinedFoldMarkers = !options.foldExplicitStart.empty() && !options.foldExplicitEnd.empty();
- for (Sci_PositionU 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 = i == (lineStartNext-1);
- if ((style == SCE_RUST_COMMENTLINE) || (style == SCE_RUST_COMMENTLINEDOC))
- inLineComment = true;
- if (options.foldComment && options.foldCommentMultiline && IsStreamCommentStyle(style) && !inLineComment) {
- 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 (options.foldComment && options.foldCommentExplicit && ((style == SCE_RUST_COMMENTLINE) || options.foldExplicitAnywhere)) {
- if (userDefinedFoldMarkers) {
- if (styler.Match(i, options.foldExplicitStart.c_str())) {
- levelNext++;
- } else if (styler.Match(i, options.foldExplicitEnd.c_str())) {
- levelNext--;
- }
- } else {
- if ((ch == '/') && (chNext == '/')) {
- char chNext2 = styler.SafeGetCharAt(i + 2);
- if (chNext2 == '{') {
- levelNext++;
- } else if (chNext2 == '}') {
- levelNext--;
- }
- }
- }
- }
- if (options.foldSyntaxBased && (style == SCE_RUST_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 (options.foldSyntaxBased && options.foldAtElse) {
- levelUse = levelMinCurrent;
- }
- int lev = levelUse | levelNext << 16;
- if (visibleChars == 0 && options.foldCompact)
- lev |= SC_FOLDLEVELWHITEFLAG;
- if (levelUse < levelNext)
- lev |= SC_FOLDLEVELHEADERFLAG;
- if (lev != styler.LevelAt(lineCurrent)) {
- styler.SetLevel(lineCurrent, lev);
- }
- lineCurrent++;
- lineStartNext = styler.LineStart(lineCurrent+1);
- levelCurrent = levelNext;
- levelMinCurrent = levelCurrent;
- if (atEOL && (i == static_cast<Sci_PositionU>(styler.Length()-1))) {
- // There is an empty line at end of file so give it same level and empty
- styler.SetLevel(lineCurrent, (levelCurrent | levelCurrent << 16) | SC_FOLDLEVELWHITEFLAG);
- }
- visibleChars = 0;
- inLineComment = false;
- }
- }
-}
-
-LexerModule lmRust(SCLEX_RUST, LexerRust::LexerFactoryRust, "rust", rustWordLists);
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-12 08:44:37 +0000