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268 lines
6.9 KiB
268 lines
6.9 KiB
// Scintilla source code edit control
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/** @file LexGAP.cxx
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** Lexer for the GAP language. (The GAP System for Computational Discrete Algebra)
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** http://www.gap-system.org
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**/
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// Copyright 2007 by Istvan Szollosi ( szteven <at> gmail <dot> com )
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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 <string>
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#include <string_view>
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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 Lexilla;
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static inline bool IsGAPOperator(char ch) {
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if (IsASCII(ch) && isalnum(ch)) return false;
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if (ch == '+' || ch == '-' || ch == '*' || ch == '/' ||
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ch == '^' || ch == ',' || ch == '!' || ch == '.' ||
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ch == '=' || ch == '<' || ch == '>' || ch == '(' ||
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ch == ')' || ch == ';' || ch == '[' || ch == ']' ||
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ch == '{' || ch == '}' || ch == ':' )
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return true;
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return false;
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}
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static void GetRange(Sci_PositionU start, Sci_PositionU end, Accessor &styler, char *s, Sci_PositionU len) {
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Sci_PositionU i = 0;
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while ((i < end - start + 1) && (i < len-1)) {
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s[i] = static_cast<char>(styler[start + i]);
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i++;
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}
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s[i] = '\0';
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}
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static void ColouriseGAPDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[], Accessor &styler) {
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WordList &keywords1 = *keywordlists[0];
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WordList &keywords2 = *keywordlists[1];
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WordList &keywords3 = *keywordlists[2];
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WordList &keywords4 = *keywordlists[3];
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// Do not leak onto next line
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if (initStyle == SCE_GAP_STRINGEOL) initStyle = SCE_GAP_DEFAULT;
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StyleContext sc(startPos, length, initStyle, styler);
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for (; sc.More(); sc.Forward()) {
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// Prevent SCE_GAP_STRINGEOL from leaking back to previous line
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if ( sc.atLineStart ) {
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if (sc.state == SCE_GAP_STRING) sc.SetState(SCE_GAP_STRING);
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if (sc.state == SCE_GAP_CHAR) sc.SetState(SCE_GAP_CHAR);
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}
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// Handle line continuation generically
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if (sc.ch == '\\' ) {
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if (sc.chNext == '\n' || sc.chNext == '\r') {
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sc.Forward();
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if (sc.ch == '\r' && sc.chNext == '\n') {
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sc.Forward();
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}
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continue;
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}
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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_GAP_OPERATOR :
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sc.SetState(SCE_GAP_DEFAULT);
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break;
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case SCE_GAP_NUMBER :
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if (!IsADigit(sc.ch)) {
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if (sc.ch == '\\') {
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if (!sc.atLineEnd) {
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if (!IsADigit(sc.chNext)) {
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sc.Forward();
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sc.ChangeState(SCE_GAP_IDENTIFIER);
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}
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}
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} else if (isalpha(sc.ch) || sc.ch == '_') {
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sc.ChangeState(SCE_GAP_IDENTIFIER);
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}
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else sc.SetState(SCE_GAP_DEFAULT);
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}
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break;
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case SCE_GAP_IDENTIFIER :
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if (!(iswordstart(static_cast<char>(sc.ch)) || sc.ch == '$')) {
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if (sc.ch == '\\') sc.Forward();
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else {
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char s[1000];
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sc.GetCurrent(s, sizeof(s));
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if (keywords1.InList(s)) {
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sc.ChangeState(SCE_GAP_KEYWORD);
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} else if (keywords2.InList(s)) {
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sc.ChangeState(SCE_GAP_KEYWORD2);
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} else if (keywords3.InList(s)) {
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sc.ChangeState(SCE_GAP_KEYWORD3);
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} else if (keywords4.InList(s)) {
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sc.ChangeState(SCE_GAP_KEYWORD4);
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}
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sc.SetState(SCE_GAP_DEFAULT);
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}
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}
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break;
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case SCE_GAP_COMMENT :
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if (sc.atLineEnd) {
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sc.SetState(SCE_GAP_DEFAULT);
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}
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break;
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case SCE_GAP_STRING:
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if (sc.atLineEnd) {
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sc.ChangeState(SCE_GAP_STRINGEOL);
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} else if (sc.ch == '\\') {
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if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
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sc.Forward();
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}
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} else if (sc.ch == '\"') {
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sc.ForwardSetState(SCE_GAP_DEFAULT);
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}
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break;
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case SCE_GAP_CHAR:
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if (sc.atLineEnd) {
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sc.ChangeState(SCE_GAP_STRINGEOL);
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} else if (sc.ch == '\\') {
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if (sc.chNext == '\"' || sc.chNext == '\'' || sc.chNext == '\\') {
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sc.Forward();
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}
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} else if (sc.ch == '\'') {
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sc.ForwardSetState(SCE_GAP_DEFAULT);
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}
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break;
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case SCE_GAP_STRINGEOL:
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if (sc.atLineStart) {
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sc.SetState(SCE_GAP_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_GAP_DEFAULT) {
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if (IsGAPOperator(static_cast<char>(sc.ch))) {
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sc.SetState(SCE_GAP_OPERATOR);
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}
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else if (IsADigit(sc.ch)) {
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sc.SetState(SCE_GAP_NUMBER);
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} else if (isalpha(sc.ch) || sc.ch == '_' || sc.ch == '\\' || sc.ch == '$' || sc.ch == '~') {
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sc.SetState(SCE_GAP_IDENTIFIER);
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if (sc.ch == '\\') sc.Forward();
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} else if (sc.ch == '#') {
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sc.SetState(SCE_GAP_COMMENT);
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} else if (sc.ch == '\"') {
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sc.SetState(SCE_GAP_STRING);
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} else if (sc.ch == '\'') {
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sc.SetState(SCE_GAP_CHAR);
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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 int ClassifyFoldPointGAP(const char* s) {
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int level = 0;
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if (strcmp(s, "function") == 0 ||
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strcmp(s, "do") == 0 ||
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strcmp(s, "if") == 0 ||
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strcmp(s, "repeat") == 0 ) {
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level = 1;
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} else if (strcmp(s, "end") == 0 ||
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strcmp(s, "od") == 0 ||
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strcmp(s, "fi") == 0 ||
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strcmp(s, "until") == 0 ) {
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level = -1;
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}
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return level;
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}
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static void FoldGAPDoc( Sci_PositionU startPos, Sci_Position length, int initStyle, WordList** , Accessor &styler) {
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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 levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
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int levelCurrent = levelPrev;
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char chNext = styler[startPos];
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int styleNext = styler.StyleAt(startPos);
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int style = initStyle;
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Sci_Position lastStart = 0;
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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 stylePrev = style;
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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 (stylePrev != SCE_GAP_KEYWORD && style == SCE_GAP_KEYWORD) {
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// Store last word start point.
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lastStart = i;
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}
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if (stylePrev == SCE_GAP_KEYWORD) {
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if(iswordchar(ch) && !iswordchar(chNext)) {
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char s[100];
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GetRange(lastStart, i, styler, s, sizeof(s));
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levelCurrent += ClassifyFoldPointGAP(s);
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}
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}
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if (atEOL) {
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int lev = levelPrev;
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if ((levelCurrent > levelPrev) && (visibleChars > 0))
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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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levelPrev = 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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int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
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styler.SetLevel(lineCurrent, levelPrev | flagsNext);
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}
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static const char * const GAPWordListDesc[] = {
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"Keywords 1",
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"Keywords 2",
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"Keywords 3 (unused)",
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"Keywords 4 (unused)",
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0
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};
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extern const LexerModule lmGAP(
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SCLEX_GAP,
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ColouriseGAPDoc,
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"gap",
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FoldGAPDoc,
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GAPWordListDesc);
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