221 lines
7.6 KiB
C++
221 lines
7.6 KiB
C++
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// Scintilla source code edit control
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/** @file LexSAS.cxx
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** Lexer for SAS
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**/
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// Author: Luke Rasmussen (luke.rasmussen@gmail.com)
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//
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// The License.txt file describes the conditions under which this software may
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// be distributed.
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//
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// Developed as part of the StatTag project at Northwestern University Feinberg
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// School of Medicine with funding from Northwestern University Clinical and
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// Translational Sciences Institute through CTSA grant UL1TR001422. This work
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// has not been reviewed or endorsed by NCATS or the NIH.
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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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using namespace Scintilla;
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static void ColouriseSASDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[],
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Accessor &styler) {
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WordList &keywords = *keywordlists[0];
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WordList &blockKeywords = *keywordlists[1];
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WordList &functionKeywords = *keywordlists[2];
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WordList &statements = *keywordlists[3];
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CharacterSet setCouldBePostOp(CharacterSet::setNone, "+-");
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CharacterSet setMacroStart(CharacterSet::setNone, "%");
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CharacterSet setWordStart(CharacterSet::setAlpha, "_", 0x80, true);
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CharacterSet setWord(CharacterSet::setAlphaNum, "._", 0x80, true);
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StyleContext sc(startPos, length, initStyle, styler);
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bool lineHasNonCommentChar = false;
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for (; sc.More(); sc.Forward()) {
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if (sc.atLineStart) {
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lineHasNonCommentChar = false;
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}
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// Determine if the current state should terminate.
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switch (sc.state) {
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case SCE_SAS_OPERATOR:
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sc.SetState(SCE_SAS_DEFAULT);
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break;
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case SCE_SAS_NUMBER:
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// We accept almost anything because of hex. and number suffixes
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if (!setWord.Contains(sc.ch)) {
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sc.SetState(SCE_SAS_DEFAULT);
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}
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break;
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case SCE_SAS_MACRO:
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if (!setWord.Contains(sc.ch) || (sc.ch == '.')) {
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char s[1000];
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sc.GetCurrentLowered(s, sizeof(s));
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if (keywords.InList(s)) {
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sc.ChangeState(SCE_SAS_MACRO_KEYWORD);
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}
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else if (blockKeywords.InList(s)) {
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sc.ChangeState(SCE_SAS_BLOCK_KEYWORD);
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}
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else if (functionKeywords.InList(s)) {
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sc.ChangeState(SCE_SAS_MACRO_FUNCTION);
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}
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sc.SetState(SCE_SAS_DEFAULT);
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}
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break;
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case SCE_SAS_IDENTIFIER:
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if (!setWord.Contains(sc.ch) || (sc.ch == '.')) {
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char s[1000];
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sc.GetCurrentLowered(s, sizeof(s));
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if (statements.InList(s)) {
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sc.ChangeState(SCE_SAS_STATEMENT);
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}
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else if(blockKeywords.InList(s)) {
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sc.ChangeState(SCE_SAS_BLOCK_KEYWORD);
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}
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sc.SetState(SCE_SAS_DEFAULT);
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}
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break;
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case SCE_SAS_COMMENTBLOCK:
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if (sc.Match('*', '/')) {
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sc.Forward();
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sc.ForwardSetState(SCE_SAS_DEFAULT);
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}
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break;
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case SCE_SAS_COMMENT:
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case SCE_SAS_COMMENTLINE:
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if (sc.Match(';')) {
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sc.Forward();
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sc.SetState(SCE_SAS_DEFAULT);
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}
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break;
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case SCE_SAS_STRING:
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if (sc.ch == '\"') {
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sc.ForwardSetState(SCE_SAS_DEFAULT);
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}
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break;
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}
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// Determine if a new state should be entered.
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if (sc.state == SCE_SAS_DEFAULT) {
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if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
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lineHasNonCommentChar = true;
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sc.SetState(SCE_SAS_NUMBER);
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}
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else if (setWordStart.Contains(sc.ch)) {
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lineHasNonCommentChar = true;
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sc.SetState(SCE_SAS_IDENTIFIER);
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}
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else if (sc.Match('*') && !lineHasNonCommentChar) {
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sc.SetState(SCE_SAS_COMMENT);
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}
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else if (sc.Match('/', '*')) {
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sc.SetState(SCE_SAS_COMMENTBLOCK);
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sc.Forward(); // Eat the * so it isn't used for the end of the comment
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}
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else if (sc.Match('/', '/')) {
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sc.SetState(SCE_SAS_COMMENTLINE);
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}
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else if (sc.ch == '\"') {
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lineHasNonCommentChar = true;
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sc.SetState(SCE_SAS_STRING);
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}
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else if (setMacroStart.Contains(sc.ch)) {
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lineHasNonCommentChar = true;
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sc.SetState(SCE_SAS_MACRO);
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}
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else if (isoperator(static_cast<char>(sc.ch))) {
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lineHasNonCommentChar = true;
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sc.SetState(SCE_SAS_OPERATOR);
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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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// Store both the current line's fold level and the next lines in the
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// level store to make it easy to pick up with each increment
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// and to make it possible to fiddle the current level for "} else {".
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static void FoldSASDoc(Sci_PositionU startPos, Sci_Position length, int, WordList *[],
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Accessor &styler) {
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bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
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bool foldAtElse = styler.GetPropertyInt("fold.at.else", 0) != 0;
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Sci_PositionU endPos = startPos + length;
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int visibleChars = 0;
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Sci_Position lineCurrent = styler.GetLine(startPos);
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int levelCurrent = SC_FOLDLEVELBASE;
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if (lineCurrent > 0)
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levelCurrent = styler.LevelAt(lineCurrent - 1) >> 16;
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int levelMinCurrent = levelCurrent;
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int levelNext = levelCurrent;
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char chNext = styler[startPos];
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int styleNext = styler.StyleAt(startPos);
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for (Sci_PositionU i = startPos; i < endPos; i++) {
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char ch = chNext;
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chNext = styler.SafeGetCharAt(i + 1);
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int style = styleNext;
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styleNext = styler.StyleAt(i + 1);
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bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
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if (style == SCE_R_OPERATOR) {
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if (ch == '{') {
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// Measure the minimum before a '{' to allow
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// folding on "} else {"
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if (levelMinCurrent > levelNext) {
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levelMinCurrent = levelNext;
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}
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levelNext++;
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}
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else if (ch == '}') {
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levelNext--;
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}
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}
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if (atEOL) {
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int levelUse = levelCurrent;
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if (foldAtElse) {
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levelUse = levelMinCurrent;
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}
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int lev = levelUse | levelNext << 16;
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if (visibleChars == 0 && foldCompact)
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lev |= SC_FOLDLEVELWHITEFLAG;
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if (levelUse < levelNext)
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lev |= SC_FOLDLEVELHEADERFLAG;
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if (lev != styler.LevelAt(lineCurrent)) {
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styler.SetLevel(lineCurrent, lev);
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}
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lineCurrent++;
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levelCurrent = levelNext;
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levelMinCurrent = levelCurrent;
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visibleChars = 0;
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}
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if (!isspacechar(ch))
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visibleChars++;
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}
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}
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static const char * const SASWordLists[] = {
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"Language Keywords",
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"Macro Keywords",
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"Types",
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0,
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};
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LexerModule lmSAS(SCLEX_SAS, ColouriseSASDoc, "sas", FoldSASDoc, SASWordLists);
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