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Diffstat (limited to 'src/LexR.cxx')
| -rw-r--r-- | src/LexR.cxx | 210 |
1 files changed, 210 insertions, 0 deletions
diff --git a/src/LexR.cxx b/src/LexR.cxx new file mode 100644 index 000000000..439e3e56f --- /dev/null +++ b/src/LexR.cxx @@ -0,0 +1,210 @@ +// 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" + + +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) || (sc.ch == '.')) { + char s[100]; + sc.GetCurrentLowered(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); |