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450 lines
14 KiB
450 lines
14 KiB
// 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 <ctype.h>
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#include <stdio.h>
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#include <stdarg.h>
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#include "Platform.h"
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#include "PropSet.h"
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#include "Accessor.h"
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#include "StyleContext.h"
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#include "KeyWords.h"
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#include "Scintilla.h"
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#include "SciLexer.h"
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enum kwType { kwOther, kwClass, kwDef, kwImport };
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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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static bool IsPyStringStart(int ch, int chNext, int chNext2) {
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if (ch == '\'' || ch == '"')
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return true;
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if (ch == 'u' || ch == 'U') {
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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) {
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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, 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 (ch == 'u' || ch == 'U') {
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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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startPos = styler.LineStart(lineCurrent);
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if (startPos == 0)
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initStyle = SCE_P_DEFAULT;
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else
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initStyle = styler.StyleAt(startPos - 1);
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}
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}
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WordList &keywords = *keywordlists[0];
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WordList &keywords2 = *keywordlists[1];
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const int whingeLevel = styler.GetPropertyInt("tab.timmy.whinge.level");
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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 hexadecimal = false;
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// Python uses a different mask because bad indentation is marked by oring with 32
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StyleContext sc(startPos, endPos - startPos, initStyle, styler, 0x7f);
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for (; sc.More(); sc.Forward()) {
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if (sc.atLineStart) {
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const char chBad = static_cast<char>(64);
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const char chGood = static_cast<char>(0);
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char chFlags = chGood;
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if (whingeLevel == 1) {
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chFlags = (spaceFlags & wsInconsistent) ? chBad : chGood;
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} else if (whingeLevel == 2) {
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chFlags = (spaceFlags & wsSpaceTab) ? chBad : chGood;
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} else if (whingeLevel == 3) {
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chFlags = (spaceFlags & wsSpace) ? chBad : chGood;
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} else if (whingeLevel == 4) {
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chFlags = (spaceFlags & wsTab) ? chBad : chGood;
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}
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sc.SetState(sc.state);
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styler.SetFlags(chFlags, static_cast<char>(sc.state));
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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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styler.IndentAmount(lineCurrent, &spaceFlags, IsPyComment);
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if ((sc.state == SCE_P_STRING) || (sc.state == SCE_P_CHARACTER)) {
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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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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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!(!hexadecimal && ((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 (keywords2.InList(s)) {
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style = SCE_P_WORD2;
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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
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kwLast = kwOther;
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} else {
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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 (sc.ch == '\r' || sc.ch == '\n') {
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sc.SetState(SCE_P_DEFAULT);
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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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}
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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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sc.Forward();
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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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// 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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hexadecimal = true;
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} else {
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hexadecimal = false;
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}
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sc.SetState(SCE_P_NUMBER);
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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))) {
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unsigned int nextIndex = 0;
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sc.SetState(GetPyStringState(styler, sc.currentPos, &nextIndex));
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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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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 = styler.GetLine(maxPos - 1); // Requested last line
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const int docLines = styler.GetLine(styler.Length() - 1); // Available last line
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const bool foldComment = styler.GetPropertyInt("fold.comment.python") != 0;
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const bool foldQuotes = styler.GetPropertyInt("fold.quotes.python") != 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;
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int prevQuote = foldQuotes && ((prev_state == SCE_P_TRIPLE) || (prev_state == SCE_P_TRIPLEDOUBLE));
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int prevComment = 0;
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if (lineCurrent >= 1)
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prevComment = foldComment && IsCommentLine(lineCurrent - 1, styler);
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// Process all characters to end of requested range or end of any triple quote
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// or comment that hangs over the end of the range. Cap processing in all cases
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// to end of document (in case of unclosed quote or comment at end).
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while ((lineCurrent <= docLines) && ((lineCurrent <= maxLines) || prevQuote || prevComment)) {
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// Gather info
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int lev = indentCurrent;
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int lineNext = lineCurrent + 1;
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int indentNext = indentCurrent;
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int quote = false;
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if (lineNext <= docLines) {
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// Information about next line is only available if not at end of document
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indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
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int style = styler.StyleAt(styler.LineStart(lineNext)) & 31;
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quote = foldQuotes && ((style == SCE_P_TRIPLE) || (style == SCE_P_TRIPLEDOUBLE));
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}
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const int quote_start = (quote && !prevQuote);
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const int quote_continue = (quote && prevQuote);
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const int comment = foldComment && IsCommentLine(lineCurrent, styler);
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const int comment_start = (comment && !prevComment && (lineNext <= docLines) &&
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IsCommentLine(lineNext, styler) && (lev > SC_FOLDLEVELBASE));
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const int comment_continue = (comment && prevComment);
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if ((!quote || !prevQuote) && !comment)
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indentCurrentLevel = indentCurrent & SC_FOLDLEVELNUMBERMASK;
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if (quote)
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indentNext = indentCurrentLevel;
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if (indentNext & SC_FOLDLEVELWHITEFLAG)
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indentNext = SC_FOLDLEVELWHITEFLAG | indentCurrentLevel;
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if (quote_start) {
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// Place fold point at start of triple quoted string
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lev |= SC_FOLDLEVELHEADERFLAG;
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} else if (quote_continue || prevQuote) {
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// Add level to rest of lines in the string
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lev = lev + 1;
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} else if (comment_start) {
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// Place fold point at start of a block of comments
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lev |= SC_FOLDLEVELHEADERFLAG;
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} else if (comment_continue) {
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// Add level to rest of lines in the block
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lev = lev + 1;
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}
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// Skip past any blank lines for next indent level info; we skip also
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// comments (all comments, not just those starting in column 0)
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// which effectively folds them into surrounding code rather
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// than screwing up folding.
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while (!quote &&
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(lineNext < docLines) &&
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((indentNext & SC_FOLDLEVELWHITEFLAG) ||
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(lineNext <= docLines && IsCommentLine(lineNext, styler)))) {
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lineNext++;
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indentNext = styler.IndentAmount(lineNext, &spaceFlags, NULL);
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}
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const int levelAfterComments = indentNext & SC_FOLDLEVELNUMBERMASK;
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const int levelBeforeComments = Platform::Maximum(indentCurrentLevel,levelAfterComments);
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// Now set all the indent levels on the lines we skipped
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// Do this from end to start. Once we encounter one line
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// which is indented more than the line after the end of
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// the comment-block, use the level of the block before
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int skipLine = lineNext;
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int skipLevel = levelAfterComments;
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while (--skipLine > lineCurrent) {
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int skipLineIndent = styler.IndentAmount(skipLine, &spaceFlags, NULL);
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if ((skipLineIndent & SC_FOLDLEVELNUMBERMASK) > levelAfterComments)
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skipLevel = levelBeforeComments;
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int whiteFlag = skipLineIndent & SC_FOLDLEVELWHITEFLAG;
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styler.SetLevel(skipLine, skipLevel | whiteFlag);
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}
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// Set fold header on non-quote/non-comment line
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if (!quote && !comment && !(indentCurrent & SC_FOLDLEVELWHITEFLAG) ) {
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if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK))
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lev |= SC_FOLDLEVELHEADERFLAG;
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}
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// Keep track of triple quote and block comment state of previous line
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prevQuote = quote;
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prevComment = comment_start || comment_continue;
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// Set fold level for this line and move to next line
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styler.SetLevel(lineCurrent, lev);
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indentCurrent = indentNext;
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lineCurrent = lineNext;
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}
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// NOTE: Cannot set level of last line here because indentCurrent doesn't have
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// header flag set; the loop above is crafted to take care of this case!
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//styler.SetLevel(lineCurrent, indentCurrent);
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}
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static const char * const pythonWordListDesc[] = {
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"Keywords",
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"Highlighted identifiers",
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0
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};
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LexerModule lmPython(SCLEX_PYTHON, ColourisePyDoc, "python", FoldPyDoc,
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pythonWordListDesc);
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