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267 lines
6.9 KiB
267 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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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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