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Diffstat (limited to 'src/LexGAP.cxx')
| -rw-r--r-- | src/LexGAP.cxx | 260 |
1 files changed, 260 insertions, 0 deletions
diff --git a/src/LexGAP.cxx b/src/LexGAP.cxx new file mode 100644 index 000000000..4aa555a79 --- /dev/null +++ b/src/LexGAP.cxx @@ -0,0 +1,260 @@ +// Scintilla source code edit control +/** @file LexGAP.cxx + ** Lexer for the GAP language. (The GAP System for Computational Discrete Algebra) + ** http://www.gap-system.org + **/ +// Copyright 2007 by Istvan Szollosi ( szteven <at> gmail <dot> com ) +// 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 IsGAPOperator(char ch) { + if (isalnum(ch)) return false; + if (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 GetRange(unsigned int start, unsigned int end, Accessor &styler, char *s, unsigned int len) { + unsigned int i = 0; + while ((i < end - start + 1) && (i < len-1)) { + s[i] = static_cast<char>(styler[start + i]); + i++; + } + s[i] = '\0'; +} + +static void ColouriseGAPDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[], Accessor &styler) { + + WordList &keywords1 = *keywordlists[0]; + WordList &keywords2 = *keywordlists[1]; + WordList &keywords3 = *keywordlists[2]; + WordList &keywords4 = *keywordlists[3]; + + // Do not leak onto next line + if (initStyle == SCE_GAP_STRINGEOL) initStyle = SCE_GAP_DEFAULT; + + StyleContext sc(startPos, length, initStyle, styler); + + for (; sc.More(); sc.Forward()) { + + // Prevent SCE_GAP_STRINGEOL from leaking back to previous line + if ( sc.atLineStart ) { + if (sc.state == SCE_GAP_STRING) sc.SetState(SCE_GAP_STRING); + if (sc.state == SCE_GAP_CHAR) sc.SetState(SCE_GAP_CHAR); + } + + // Handle line continuation generically + if (sc.ch == '\\' ) { + if (sc.chNext == '\n' || sc.chNext == '\r') { + sc.Forward(); + if (sc.ch == '\r' && sc.chNext == '\n') { + sc.Forward(); + } + continue; + } + } + + // Determine if the current state should terminate + switch (sc.state) { + case SCE_GAP_OPERATOR : + sc.SetState(SCE_GAP_DEFAULT); + break; + + case SCE_GAP_NUMBER : + if (!IsADigit(sc.ch)) { + if (sc.ch == '\\') { + if (!sc.atLineEnd) { + if (!IsADigit(sc.chNext)) { + sc.Forward(); + sc.ChangeState(SCE_GAP_IDENTIFIER); + } + } + } else if (isalpha(sc.ch) || sc.ch == '_') { + sc.ChangeState(SCE_GAP_IDENTIFIER); + } + else sc.SetState(SCE_GAP_DEFAULT); + } + break; + + case SCE_GAP_IDENTIFIER : + if (!(iswordstart(static_cast<char>(sc.ch)) || sc.ch == '$')) { + if (sc.ch == '\\') sc.Forward(); + else { + char s[1000]; + sc.GetCurrent(s, sizeof(s)); + if (keywords1.InList(s)) { + sc.ChangeState(SCE_GAP_KEYWORD); + } else if (keywords2.InList(s)) { + sc.ChangeState(SCE_GAP_KEYWORD2); + } else if (keywords3.InList(s)) { + sc.ChangeState(SCE_GAP_KEYWORD3); + } else if (keywords4.InList(s)) { + sc.ChangeState(SCE_GAP_KEYWORD4); + } + sc.SetState(SCE_GAP_DEFAULT); + } + } + break; + + case SCE_GAP_COMMENT : + if (sc.atLineEnd) { + sc.SetState(SCE_GAP_DEFAULT); + } + break; + + case SCE_GAP_STRING: + if (sc.atLineEnd) { + sc.ChangeState(SCE_GAP_STRINGEOL); + } else if (sc.ch == '\\') { + if (sc.chNext == '\"') { + sc.Forward(); + } + } else if (sc.ch == '\"') { + sc.ForwardSetState(SCE_GAP_DEFAULT); + } + break; + + case SCE_GAP_CHAR: + if (sc.atLineEnd) { + sc.ChangeState(SCE_GAP_STRINGEOL); + } else if (sc.ch == '\\') { + if (sc.chNext == '\'') { + sc.Forward(); + } + } else if (sc.ch == '\'') { + sc.ForwardSetState(SCE_GAP_DEFAULT); + } + break; + + case SCE_GAP_STRINGEOL: + if (sc.atLineStart) { + sc.SetState(SCE_GAP_DEFAULT); + } + break; + } + + // Determine if a new state should be entered + if (sc.state == SCE_GAP_DEFAULT) { + if (IsGAPOperator(static_cast<char>(sc.ch))) { + sc.SetState(SCE_GAP_OPERATOR); + } + else if (IsADigit(sc.ch)) { + sc.SetState(SCE_GAP_NUMBER); + } else if (isalpha(sc.ch) || sc.ch == '_' || sc.ch == '\\' || sc.ch == '$' || sc.ch == '~') { + sc.SetState(SCE_GAP_IDENTIFIER); + if (sc.ch == '\\') sc.Forward(); + } else if (sc.ch == '#') { + sc.SetState(SCE_GAP_COMMENT); + } else if (sc.ch == '\"') { + sc.SetState(SCE_GAP_STRING); + } else if (sc.ch == '\'') { + sc.SetState(SCE_GAP_CHAR); + } + } + + } + sc.Complete(); +} + +static int ClassifyFoldPointGAP(const char* s) { + int level = 0; + if (strcmp(s, "function") == 0 || + strcmp(s, "do") == 0 || + strcmp(s, "if") == 0 || + strcmp(s, "repeat") == 0 ) { + level = 1; + } else if (strcmp(s, "end") == 0 || + strcmp(s, "od") == 0 || + strcmp(s, "fi") == 0 || + strcmp(s, "until") == 0 ) { + level = -1; + } + return level; +} + +static void FoldGAPDoc( unsigned int startPos, int length, int initStyle, WordList** , Accessor &styler) { + unsigned int endPos = startPos + length; + int visibleChars = 0; + int lineCurrent = styler.GetLine(startPos); + int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK; + int levelCurrent = levelPrev; + char chNext = styler[startPos]; + int styleNext = styler.StyleAt(startPos); + int style = initStyle; + + int lastStart = 0; + + for (unsigned int i = startPos; i < endPos; i++) { + char ch = chNext; + chNext = styler.SafeGetCharAt(i + 1); + int stylePrev = style; + style = styleNext; + styleNext = styler.StyleAt(i + 1); + bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n'); + + if (stylePrev == SCE_GAP_DEFAULT && style == SCE_GAP_KEYWORD) { + // Store last word start point. + lastStart = i; + } + + if (stylePrev == SCE_GAP_KEYWORD) { + if(iswordchar(ch) && !iswordchar(chNext)) { + char s[100]; + GetRange(lastStart, i, styler, s, sizeof(s)); + levelCurrent += ClassifyFoldPointGAP(s); + } + } + + if (atEOL) { + int lev = levelPrev; + if ((levelCurrent > levelPrev) && (visibleChars > 0)) + lev |= SC_FOLDLEVELHEADERFLAG; + if (lev != styler.LevelAt(lineCurrent)) { + styler.SetLevel(lineCurrent, lev); + } + lineCurrent++; + levelPrev = levelCurrent; + visibleChars = 0; + } + + if (!isspacechar(ch)) + visibleChars++; + } + + int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK; + styler.SetLevel(lineCurrent, levelPrev | flagsNext); +} + +static const char * const GAPWordListDesc[] = { + "Keywords 1", + "Keywords 2", + "Keywords 3 (unused)", + "Keywords 4 (unused)", + 0 +}; + +LexerModule lmGAP( + SCLEX_GAP, + ColouriseGAPDoc, + "gap", + FoldGAPDoc, + GAPWordListDesc); |