572 lines
19 KiB
C++
572 lines
19 KiB
C++
// Scintilla source code edit control
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/** @file LexPython.cxx
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** Lexer for Python.
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**/
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// Copyright 1998-2002 by Neil Hodgson <neilh@scintilla.org>
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// The License.txt file describes the conditions under which this software may be distributed.
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <ctype.h>
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#include "ILexer.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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#include "WordList.h"
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#include "LexAccessor.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "CharacterSet.h"
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#include "LexerModule.h"
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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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/* kwCDef, kwCTypeName only used for Cython */
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enum kwType { kwOther, kwClass, kwDef, kwImport, kwCDef, kwCTypeName, kwCPDef };
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static const int indicatorWhitespace = 1;
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static bool IsPyComment(Accessor &styler, int pos, int len) {
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return len > 0 && styler[pos] == '#';
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}
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enum literalsAllowed { litNone=0, litU=1, litB=2};
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static bool IsPyStringTypeChar(int ch, literalsAllowed allowed) {
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return
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((allowed & litB) && (ch == 'b' || ch == 'B')) ||
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((allowed & litU) && (ch == 'u' || ch == 'U'));
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}
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static bool IsPyStringStart(int ch, int chNext, int chNext2, literalsAllowed allowed) {
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if (ch == '\'' || ch == '"')
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return true;
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if (IsPyStringTypeChar(ch, allowed)) {
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if (chNext == '"' || chNext == '\'')
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return true;
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if ((chNext == 'r' || chNext == 'R') && (chNext2 == '"' || chNext2 == '\''))
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return true;
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}
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if ((ch == 'r' || ch == 'R') && (chNext == '"' || chNext == '\''))
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return true;
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return false;
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}
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/* Return the state to use for the string starting at i; *nextIndex will be set to the first index following the quote(s) */
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static int GetPyStringState(Accessor &styler, int i, unsigned int *nextIndex, literalsAllowed allowed) {
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char ch = styler.SafeGetCharAt(i);
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char chNext = styler.SafeGetCharAt(i + 1);
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// Advance beyond r, u, or ur prefix (or r, b, or br in Python 3.0), but bail if there are any unexpected chars
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if (ch == 'r' || ch == 'R') {
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i++;
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ch = styler.SafeGetCharAt(i);
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chNext = styler.SafeGetCharAt(i + 1);
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} else if (IsPyStringTypeChar(ch, allowed)) {
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if (chNext == 'r' || chNext == 'R')
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i += 2;
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else
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i += 1;
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ch = styler.SafeGetCharAt(i);
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chNext = styler.SafeGetCharAt(i + 1);
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}
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if (ch != '"' && ch != '\'') {
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*nextIndex = i + 1;
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return SCE_P_DEFAULT;
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}
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if (ch == chNext && ch == styler.SafeGetCharAt(i + 2)) {
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*nextIndex = i + 3;
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if (ch == '"')
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return SCE_P_TRIPLEDOUBLE;
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else
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return SCE_P_TRIPLE;
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} else {
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*nextIndex = i + 1;
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if (ch == '"')
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return SCE_P_STRING;
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else
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return SCE_P_CHARACTER;
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}
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}
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static inline bool IsAWordChar(int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
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}
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static inline bool IsAWordStart(int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '_');
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}
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static void ColourisePyDoc(unsigned int startPos, int length, int initStyle,
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WordList *keywordlists[], Accessor &styler) {
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int endPos = startPos + length;
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// Backtrack to previous line in case need to fix its tab whinging
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int lineCurrent = styler.GetLine(startPos);
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if (startPos > 0) {
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if (lineCurrent > 0) {
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lineCurrent--;
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// Look for backslash-continued lines
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while (lineCurrent > 0) {
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int eolPos = styler.LineStart(lineCurrent) - 1;
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int eolStyle = styler.StyleAt(eolPos);
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if (eolStyle == SCE_P_STRING
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|| eolStyle == SCE_P_CHARACTER
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|| eolStyle == SCE_P_STRINGEOL) {
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lineCurrent -= 1;
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} else {
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break;
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}
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}
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startPos = styler.LineStart(lineCurrent);
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}
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initStyle = startPos == 0 ? SCE_P_DEFAULT : styler.StyleAt(startPos - 1);
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}
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WordList &keywords = *keywordlists[0];
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WordList &keywords2 = *keywordlists[1];
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// property tab.timmy.whinge.level
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// For Python code, checks whether indenting is consistent.
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// The default, 0 turns off indentation checking,
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// 1 checks whether each line is potentially inconsistent with the previous line,
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// 2 checks whether any space characters occur before a tab character in the indentation,
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// 3 checks whether any spaces are in the indentation, and
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// 4 checks for any tab characters in the indentation.
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// 1 is a good level to use.
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const int whingeLevel = styler.GetPropertyInt("tab.timmy.whinge.level");
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// property lexer.python.literals.binary
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// Set to 0 to not recognise Python 3 binary and octal literals: 0b1011 0o712.
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bool base2or8Literals = styler.GetPropertyInt("lexer.python.literals.binary", 1) != 0;
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// property lexer.python.strings.u
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// Set to 0 to not recognise Python Unicode literals u"x" as used before Python 3.
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literalsAllowed allowedLiterals = (styler.GetPropertyInt("lexer.python.strings.u", 1)) ? litU : litNone;
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// property lexer.python.strings.b
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// Set to 0 to not recognise Python 3 bytes literals b"x".
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if (styler.GetPropertyInt("lexer.python.strings.b", 1))
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allowedLiterals = static_cast<literalsAllowed>(allowedLiterals | litB);
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// property lexer.python.strings.over.newline
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// Set to 1 to allow strings to span newline characters.
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bool stringsOverNewline = styler.GetPropertyInt("lexer.python.strings.over.newline") != 0;
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// property lexer.python.keywords2.no.sub.identifiers
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// When enabled, it will not style keywords2 items that are used as a sub-identifier.
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// Example: when set, will not highlight "foo.open" when "open" is a keywords2 item.
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const bool keywords2NoSubIdentifiers = styler.GetPropertyInt("lexer.python.keywords2.no.sub.identifiers") != 0;
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initStyle = initStyle & 31;
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if (initStyle == SCE_P_STRINGEOL) {
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initStyle = SCE_P_DEFAULT;
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}
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kwType kwLast = kwOther;
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int spaceFlags = 0;
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styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
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bool base_n_number = false;
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StyleContext sc(startPos, endPos - startPos, initStyle, styler);
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bool indentGood = true;
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int startIndicator = sc.currentPos;
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bool inContinuedString = false;
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for (; sc.More(); sc.Forward()) {
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if (sc.atLineStart) {
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styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
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indentGood = true;
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if (whingeLevel == 1) {
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indentGood = (spaceFlags & wsInconsistent) == 0;
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} else if (whingeLevel == 2) {
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indentGood = (spaceFlags & wsSpaceTab) == 0;
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} else if (whingeLevel == 3) {
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indentGood = (spaceFlags & wsSpace) == 0;
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} else if (whingeLevel == 4) {
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indentGood = (spaceFlags & wsTab) == 0;
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}
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if (!indentGood) {
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styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 0);
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startIndicator = sc.currentPos;
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}
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}
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if (sc.atLineEnd) {
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if ((sc.state == SCE_P_DEFAULT) ||
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(sc.state == SCE_P_TRIPLE) ||
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(sc.state == SCE_P_TRIPLEDOUBLE)) {
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// Perform colourisation of white space and triple quoted strings at end of each line to allow
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// tab marking to work inside white space and triple quoted strings
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sc.SetState(sc.state);
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}
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lineCurrent++;
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if ((sc.state == SCE_P_STRING) || (sc.state == SCE_P_CHARACTER)) {
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if (inContinuedString || stringsOverNewline) {
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inContinuedString = false;
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} else {
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sc.ChangeState(SCE_P_STRINGEOL);
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sc.ForwardSetState(SCE_P_DEFAULT);
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}
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}
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if (!sc.More())
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break;
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}
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bool needEOLCheck = false;
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// Check for a state end
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if (sc.state == SCE_P_OPERATOR) {
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kwLast = kwOther;
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sc.SetState(SCE_P_DEFAULT);
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} else if (sc.state == SCE_P_NUMBER) {
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if (!IsAWordChar(sc.ch) &&
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!(!base_n_number && ((sc.ch == '+' || sc.ch == '-') && (sc.chPrev == 'e' || sc.chPrev == 'E')))) {
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sc.SetState(SCE_P_DEFAULT);
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}
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} else if (sc.state == SCE_P_IDENTIFIER) {
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if ((sc.ch == '.') || (!IsAWordChar(sc.ch))) {
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char s[100];
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sc.GetCurrent(s, sizeof(s));
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int style = SCE_P_IDENTIFIER;
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if ((kwLast == kwImport) && (strcmp(s, "as") == 0)) {
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style = SCE_P_WORD;
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} else if (keywords.InList(s)) {
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style = SCE_P_WORD;
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} else if (kwLast == kwClass) {
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style = SCE_P_CLASSNAME;
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} else if (kwLast == kwDef) {
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style = SCE_P_DEFNAME;
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} else if (kwLast == kwCDef || kwLast == kwCPDef) {
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int pos = sc.currentPos;
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unsigned char ch = styler.SafeGetCharAt(pos, '\0');
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while (ch != '\0') {
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if (ch == '(') {
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style = SCE_P_DEFNAME;
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break;
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} else if (ch == ':') {
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style = SCE_P_CLASSNAME;
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break;
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} else if (ch == ' ' || ch == '\t' || ch == '\n' || ch == '\r') {
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pos++;
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ch = styler.SafeGetCharAt(pos, '\0');
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} else {
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break;
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}
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}
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} else if (keywords2.InList(s)) {
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if (keywords2NoSubIdentifiers) {
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// We don't want to highlight keywords2
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// that are used as a sub-identifier,
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// i.e. not open in "foo.open".
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int pos = styler.GetStartSegment() - 1;
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if (pos < 0 || (styler.SafeGetCharAt(pos, '\0') != '.'))
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style = SCE_P_WORD2;
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} else {
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style = SCE_P_WORD2;
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}
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}
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sc.ChangeState(style);
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sc.SetState(SCE_P_DEFAULT);
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if (style == SCE_P_WORD) {
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if (0 == strcmp(s, "class"))
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kwLast = kwClass;
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else if (0 == strcmp(s, "def"))
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kwLast = kwDef;
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else if (0 == strcmp(s, "import"))
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kwLast = kwImport;
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else if (0 == strcmp(s, "cdef"))
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kwLast = kwCDef;
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else if (0 == strcmp(s, "cpdef"))
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kwLast = kwCPDef;
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else if (0 == strcmp(s, "cimport"))
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kwLast = kwImport;
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else if (kwLast != kwCDef && kwLast != kwCPDef)
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kwLast = kwOther;
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} else if (kwLast != kwCDef && kwLast != kwCPDef) {
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kwLast = kwOther;
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}
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}
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} else if ((sc.state == SCE_P_COMMENTLINE) || (sc.state == SCE_P_COMMENTBLOCK)) {
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if (sc.ch == '\r' || sc.ch == '\n') {
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sc.SetState(SCE_P_DEFAULT);
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}
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} else if (sc.state == SCE_P_DECORATOR) {
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if (!IsAWordChar(sc.ch)) {
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sc.SetState(SCE_P_DEFAULT);
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}
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} else if ((sc.state == SCE_P_STRING) || (sc.state == SCE_P_CHARACTER)) {
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if (sc.ch == '\\') {
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if ((sc.chNext == '\r') && (sc.GetRelative(2) == '\n')) {
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sc.Forward();
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}
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if (sc.chNext == '\n' || sc.chNext == '\r') {
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inContinuedString = true;
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} else {
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// Don't roll over the newline.
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sc.Forward();
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}
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} else if ((sc.state == SCE_P_STRING) && (sc.ch == '\"')) {
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sc.ForwardSetState(SCE_P_DEFAULT);
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needEOLCheck = true;
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} else if ((sc.state == SCE_P_CHARACTER) && (sc.ch == '\'')) {
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sc.ForwardSetState(SCE_P_DEFAULT);
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needEOLCheck = true;
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}
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} else if (sc.state == SCE_P_TRIPLE) {
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if (sc.ch == '\\') {
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sc.Forward();
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} else if (sc.Match("\'\'\'")) {
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sc.Forward();
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sc.Forward();
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sc.ForwardSetState(SCE_P_DEFAULT);
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needEOLCheck = true;
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}
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} else if (sc.state == SCE_P_TRIPLEDOUBLE) {
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if (sc.ch == '\\') {
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sc.Forward();
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} else if (sc.Match("\"\"\"")) {
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sc.Forward();
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sc.Forward();
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sc.ForwardSetState(SCE_P_DEFAULT);
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needEOLCheck = true;
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}
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}
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if (!indentGood && !IsASpaceOrTab(sc.ch)) {
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styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 1);
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startIndicator = sc.currentPos;
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indentGood = true;
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}
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// One cdef or cpdef line, clear kwLast only at end of line
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if ((kwLast == kwCDef || kwLast == kwCPDef) && sc.atLineEnd) {
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kwLast = kwOther;
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}
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// State exit code may have moved on to end of line
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if (needEOLCheck && sc.atLineEnd) {
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lineCurrent++;
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styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
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if (!sc.More())
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break;
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}
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// Check for a new state starting character
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if (sc.state == SCE_P_DEFAULT) {
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if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
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if (sc.ch == '0' && (sc.chNext == 'x' || sc.chNext == 'X')) {
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base_n_number = true;
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sc.SetState(SCE_P_NUMBER);
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} else if (sc.ch == '0' &&
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(sc.chNext == 'o' || sc.chNext == 'O' || sc.chNext == 'b' || sc.chNext == 'B')) {
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if (base2or8Literals) {
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base_n_number = true;
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sc.SetState(SCE_P_NUMBER);
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} else {
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sc.SetState(SCE_P_NUMBER);
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sc.ForwardSetState(SCE_P_IDENTIFIER);
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}
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} else {
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base_n_number = false;
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sc.SetState(SCE_P_NUMBER);
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}
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} else if ((IsASCII(sc.ch) && isoperator(static_cast<char>(sc.ch))) || sc.ch == '`') {
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sc.SetState(SCE_P_OPERATOR);
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} else if (sc.ch == '#') {
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sc.SetState(sc.chNext == '#' ? SCE_P_COMMENTBLOCK : SCE_P_COMMENTLINE);
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} else if (sc.ch == '@') {
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sc.SetState(SCE_P_DECORATOR);
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} else if (IsPyStringStart(sc.ch, sc.chNext, sc.GetRelative(2), allowedLiterals)) {
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unsigned int nextIndex = 0;
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sc.SetState(GetPyStringState(styler, sc.currentPos, &nextIndex, allowedLiterals));
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while (nextIndex > (sc.currentPos + 1) && sc.More()) {
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sc.Forward();
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}
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} else if (IsAWordStart(sc.ch)) {
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sc.SetState(SCE_P_IDENTIFIER);
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}
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}
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}
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styler.IndicatorFill(startIndicator, sc.currentPos, indicatorWhitespace, 0);
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sc.Complete();
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}
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static bool IsCommentLine(int line, Accessor &styler) {
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int pos = styler.LineStart(line);
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int eol_pos = styler.LineStart(line + 1) - 1;
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for (int i = pos; i < eol_pos; i++) {
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char ch = styler[i];
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if (ch == '#')
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return true;
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else if (ch != ' ' && ch != '\t')
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return false;
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}
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return false;
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}
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static bool IsQuoteLine(int line, Accessor &styler) {
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int style = styler.StyleAt(styler.LineStart(line)) & 31;
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return ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
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}
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static void FoldPyDoc(unsigned int startPos, int length, int /*initStyle - unused*/,
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WordList *[], Accessor &styler) {
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const int maxPos = startPos + length;
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const int maxLines = (maxPos == styler.Length()) ? styler.GetLine(maxPos) : styler.GetLine(maxPos - 1); // Requested last line
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const int docLines = styler.GetLine(styler.Length()); // Available last line
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// property fold.quotes.python
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// This option enables folding multi-line quoted strings when using the Python lexer.
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const bool foldQuotes = styler.GetPropertyInt("fold.quotes.python") != 0;
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const bool foldCompact = styler.GetPropertyInt("fold.compact") != 0;
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// Backtrack to previous non-blank line so we can determine indent level
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// for any white space lines (needed esp. within triple quoted strings)
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// and so we can fix any preceding fold level (which is why we go back
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// at least one line in all cases)
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int spaceFlags = 0;
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int lineCurrent = styler.GetLine(startPos);
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int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
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while (lineCurrent > 0) {
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lineCurrent--;
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indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, NULL);
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if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG) &&
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(!IsCommentLine(lineCurrent, styler)) &&
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(!IsQuoteLine(lineCurrent, styler)))
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break;
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}
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int indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
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// Set up initial loop state
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startPos = styler.LineStart(lineCurrent);
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int prev_state = SCE_P_DEFAULT & 31;
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if (lineCurrent >= 1)
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prev_state = styler.StyleAt(startPos - 1) & 31;
|
|
int prevQuote = foldQuotes && ((prev_state == SCE_P_TRIPLE) || (prev_state == SCE_P_TRIPLEDOUBLE));
|
|
|
|
// 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;
|
|
int 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, NULL);
|
|
int lookAtPos = (styler.LineStart(lineNext) == styler.Length()) ? styler.Length() - 1 : styler.LineStart(lineNext);
|
|
int style = styler.StyleAt(lookAtPos) & 31;
|
|
quote = foldQuotes && ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
|
|
}
|
|
const int quote_start = (quote && !prevQuote);
|
|
const int 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.
|
|
|
|
while (!quote &&
|
|
(lineNext < docLines) &&
|
|
((indentNext & SC_FOLDLEVELWHITEFLAG) ||
|
|
(lineNext <= docLines && IsCommentLine(lineNext, styler)))) {
|
|
|
|
lineNext++;
|
|
indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
|
|
}
|
|
|
|
const int levelAfterComments = indentNext & SC_FOLDLEVELNUMBERMASK;
|
|
const int levelBeforeComments = Maximum(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
|
|
|
|
int skipLine = lineNext;
|
|
int skipLevel = levelAfterComments;
|
|
|
|
while (--skipLine > lineCurrent) {
|
|
int skipLineIndent = styler.IndentAmount(skipLine, &spaceFlags, NULL);
|
|
|
|
if (foldCompact) {
|
|
if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments)
|
|
skipLevel = levelBeforeComments;
|
|
|
|
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, 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);
|
|
}
|
|
|
|
static const char *const pythonWordListDesc[] = {
|
|
"Keywords",
|
|
"Highlighted identifiers",
|
|
0
|
|
};
|
|
|
|
LexerModule lmPython(SCLEX_PYTHON, ColourisePyDoc, "python", FoldPyDoc,
|
|
pythonWordListDesc);
|
|
|