diff options
Diffstat (limited to 'scintilla/src/LexR.cxx')
| -rw-r--r-- | scintilla/src/LexR.cxx | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/scintilla/src/LexR.cxx b/scintilla/src/LexR.cxx new file mode 100644 index 0000000..06c4dcd --- /dev/null +++ b/scintilla/src/LexR.cxx @@ -0,0 +1,213 @@ +// Scintilla source code edit control
+/** @file Lexr.cxx
+ ** Lexer for R, S, SPlus Statistics Program (Heavily derived from CPP Lexer).
+ **
+ **/
+// Copyright 1998-2002 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 <ctype.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#include "Platform.h"
+
+#include "PropSet.h"
+#include "Accessor.h"
+#include "StyleContext.h"
+#include "KeyWords.h"
+#include "Scintilla.h"
+#include "SciLexer.h"
+
+#ifdef SCI_NAMESPACE
+using namespace Scintilla;
+#endif
+
+static inline bool IsAWordChar(const int ch) {
+ return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_');
+}
+
+static inline bool IsAWordStart(const int ch) {
+ return (ch < 0x80) && (isalnum(ch) || ch == '_');
+}
+
+static inline bool IsAnOperator(const int ch) {
+ if (isascii(ch) && isalnum(ch))
+ return false;
+ // '.' left out as it is used to make up numbers
+ if (ch == '-' || ch == '+' || ch == '!' || ch == '~' ||
+ ch == '?' || ch == ':' || ch == '*' || ch == '/' ||
+ ch == '^' || ch == '<' || ch == '>' || ch == '=' ||
+ ch == '&' || ch == '|' || ch == '$' || ch == '(' ||
+ ch == ')' || ch == '}' || ch == '{' || ch == '[' ||
+ ch == ']')
+ return true;
+ return false;
+}
+
+static void ColouriseRDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
+ Accessor &styler) {
+
+ WordList &keywords = *keywordlists[0];
+ WordList &keywords2 = *keywordlists[1];
+ WordList &keywords3 = *keywordlists[2];
+
+
+ // Do not leak onto next line
+ if (initStyle == SCE_R_INFIXEOL)
+ initStyle = SCE_R_DEFAULT;
+
+
+ StyleContext sc(startPos, length, initStyle, styler);
+
+ for (; sc.More(); sc.Forward()) {
+
+ if (sc.atLineStart && (sc.state == SCE_R_STRING)) {
+ // Prevent SCE_R_STRINGEOL from leaking back to previous line
+ sc.SetState(SCE_R_STRING);
+ }
+
+ // Determine if the current state should terminate.
+ if (sc.state == SCE_R_OPERATOR) {
+ sc.SetState(SCE_R_DEFAULT);
+ } else if (sc.state == SCE_R_NUMBER) {
+ if (!IsADigit(sc.ch) && !(sc.ch == '.' && IsADigit(sc.chNext))) {
+ sc.SetState(SCE_R_DEFAULT);
+ }
+ } else if (sc.state == SCE_R_IDENTIFIER) {
+ if (!IsAWordChar(sc.ch)) {
+ char s[100];
+ sc.GetCurrent(s, sizeof(s));
+ if (keywords.InList(s)) {
+ sc.ChangeState(SCE_R_KWORD);
+ } else if (keywords2.InList(s)) {
+ sc.ChangeState(SCE_R_BASEKWORD);
+ } else if (keywords3.InList(s)) {
+ sc.ChangeState(SCE_R_OTHERKWORD);
+ }
+ sc.SetState(SCE_R_DEFAULT);
+ }
+ } else if (sc.state == SCE_R_COMMENT) {
+ if (sc.ch == '\r' || sc.ch == '\n') {
+ sc.SetState(SCE_R_DEFAULT);
+ }
+ } else if (sc.state == SCE_R_STRING) {
+ if (sc.ch == '\\') {
+ if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
+ sc.Forward();
+ }
+ } else if (sc.ch == '\"') {
+ sc.ForwardSetState(SCE_R_DEFAULT);
+ }
+ } else if (sc.state == SCE_R_INFIX) {
+ if (sc.ch == '%') {
+ sc.ForwardSetState(SCE_R_DEFAULT);
+ } else if (sc.atLineEnd) {
+ sc.ChangeState(SCE_R_INFIXEOL);
+ sc.ForwardSetState(SCE_R_DEFAULT);
+ }
+ }else if (sc.state == SCE_R_STRING2) {
+ if (sc.ch == '\\') {
+ if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
+ sc.Forward();
+ }
+ } else if (sc.ch == '\'') {
+ sc.ForwardSetState(SCE_R_DEFAULT);
+ }
+ }
+
+ // Determine if a new state should be entered.
+ if (sc.state == SCE_R_DEFAULT) {
+ if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
+ sc.SetState(SCE_R_NUMBER);
+ } else if (IsAWordStart(sc.ch) ) {
+ sc.SetState(SCE_R_IDENTIFIER);
+ } else if (sc.Match('#')) {
+ sc.SetState(SCE_R_COMMENT);
+ } else if (sc.ch == '\"') {
+ sc.SetState(SCE_R_STRING);
+ } else if (sc.ch == '%') {
+ sc.SetState(SCE_R_INFIX);
+ } else if (sc.ch == '\'') {
+ sc.SetState(SCE_R_STRING2);
+ } else if (IsAnOperator(sc.ch)) {
+ sc.SetState(SCE_R_OPERATOR);
+ }
+ }
+ }
+ sc.Complete();
+}
+
+// Store both the current line's fold level and the next lines in the
+// level store to make it easy to pick up with each increment
+// and to make it possible to fiddle the current level for "} else {".
+static void FoldRDoc(unsigned int startPos, int length, int, WordList *[],
+ Accessor &styler) {
+ bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
+ bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
+ unsigned int endPos = startPos + length;
+ int visibleChars = 0;
+ int lineCurrent = styler.GetLine(startPos);
+ int levelCurrent = SC_FOLDLEVELBASE;
+ if (lineCurrent > 0)
+ levelCurrent = styler.LevelAt(lineCurrent-1) >> 16;
+ int levelMinCurrent = levelCurrent;
+ int levelNext = levelCurrent;
+ char chNext = styler[startPos];
+ int styleNext = styler.StyleAt(startPos);
+ for (unsigned int i = startPos; i < endPos; i++) {
+ char ch = chNext;
+ chNext = styler.SafeGetCharAt(i + 1);
+ int style = styleNext;
+ styleNext = styler.StyleAt(i + 1);
+ bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
+ if (style == SCE_R_OPERATOR) {
+ if (ch == '{') {
+ // Measure the minimum before a '{' to allow
+ // folding on "} else {"
+ if (levelMinCurrent > levelNext) {
+ levelMinCurrent = levelNext;
+ }
+ levelNext++;
+ } else if (ch == '}') {
+ levelNext--;
+ }
+ }
+ if (atEOL) {
+ int levelUse = levelCurrent;
+ if (foldAtElse) {
+ levelUse = levelMinCurrent;
+ }
+ int lev = levelUse | levelNext << 16;
+ if (visibleChars == 0 && foldCompact)
+ lev |= SC_FOLDLEVELWHITEFLAG;
+ if (levelUse < levelNext)
+ lev |= SC_FOLDLEVELHEADERFLAG;
+ if (lev != styler.LevelAt(lineCurrent)) {
+ styler.SetLevel(lineCurrent, lev);
+ }
+ lineCurrent++;
+ levelCurrent = levelNext;
+ levelMinCurrent = levelCurrent;
+ visibleChars = 0;
+ }
+ if (!isspacechar(ch))
+ visibleChars++;
+ }
+}
+
+
+static const char * const RWordLists[] = {
+ "Language Keywords",
+ "Base / Default package function",
+ "Other Package Functions",
+ "Unused",
+ "Unused",
+ 0,
+ };
+
+
+
+LexerModule lmR(SCLEX_R, ColouriseRDoc, "r", FoldRDoc, RWordLists);
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