242 lines
7.4 KiB
C++
242 lines
7.4 KiB
C++
// Scintilla source code edit control
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/** @file LexEiffel.cxx
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** Lexer for Eiffel.
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**/
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// Copyright 1998-2001 by Neil Hodgson <neilh@scintilla.org>
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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 "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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#ifdef SCI_NAMESPACE
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using namespace Scintilla;
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#endif
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static inline bool isEiffelOperator(unsigned int ch) {
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// '.' left out as it is used to make up numbers
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return ch == '*' || ch == '/' || ch == '\\' || ch == '-' || ch == '+' ||
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ch == '(' || ch == ')' || ch == '=' ||
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ch == '{' || ch == '}' || ch == '~' ||
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ch == '[' || ch == ']' || ch == ';' ||
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ch == '<' || ch == '>' || ch == ',' ||
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ch == '.' || ch == '^' || ch == '%' || ch == ':' ||
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ch == '!' || ch == '@' || ch == '?';
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}
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static inline bool IsAWordChar(unsigned int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '_');
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}
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static inline bool IsAWordStart(unsigned int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '_');
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}
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static void ColouriseEiffelDoc(unsigned int startPos,
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int length,
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int initStyle,
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WordList *keywordlists[],
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Accessor &styler) {
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WordList &keywords = *keywordlists[0];
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StyleContext sc(startPos, length, initStyle, styler);
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for (; sc.More(); sc.Forward()) {
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if (sc.state == SCE_EIFFEL_STRINGEOL) {
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if (sc.ch != '\r' && sc.ch != '\n') {
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sc.SetState(SCE_EIFFEL_DEFAULT);
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}
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} else if (sc.state == SCE_EIFFEL_OPERATOR) {
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sc.SetState(SCE_EIFFEL_DEFAULT);
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} else if (sc.state == SCE_EIFFEL_WORD) {
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if (!IsAWordChar(sc.ch)) {
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char s[100];
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sc.GetCurrentLowered(s, sizeof(s));
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if (!keywords.InList(s)) {
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sc.ChangeState(SCE_EIFFEL_IDENTIFIER);
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}
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sc.SetState(SCE_EIFFEL_DEFAULT);
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}
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} else if (sc.state == SCE_EIFFEL_NUMBER) {
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if (!IsAWordChar(sc.ch)) {
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sc.SetState(SCE_EIFFEL_DEFAULT);
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}
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} else if (sc.state == SCE_EIFFEL_COMMENTLINE) {
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if (sc.ch == '\r' || sc.ch == '\n') {
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sc.SetState(SCE_EIFFEL_DEFAULT);
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}
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} else if (sc.state == SCE_EIFFEL_STRING) {
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if (sc.ch == '%') {
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sc.Forward();
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} else if (sc.ch == '\"') {
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sc.Forward();
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sc.SetState(SCE_EIFFEL_DEFAULT);
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}
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} else if (sc.state == SCE_EIFFEL_CHARACTER) {
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if (sc.ch == '\r' || sc.ch == '\n') {
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sc.SetState(SCE_EIFFEL_STRINGEOL);
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} else if (sc.ch == '%') {
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sc.Forward();
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} else if (sc.ch == '\'') {
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sc.Forward();
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sc.SetState(SCE_EIFFEL_DEFAULT);
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}
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}
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if (sc.state == SCE_EIFFEL_DEFAULT) {
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if (sc.ch == '-' && sc.chNext == '-') {
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sc.SetState(SCE_EIFFEL_COMMENTLINE);
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} else if (sc.ch == '\"') {
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sc.SetState(SCE_EIFFEL_STRING);
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} else if (sc.ch == '\'') {
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sc.SetState(SCE_EIFFEL_CHARACTER);
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} else if (IsADigit(sc.ch) || (sc.ch == '.')) {
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sc.SetState(SCE_EIFFEL_NUMBER);
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} else if (IsAWordStart(sc.ch)) {
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sc.SetState(SCE_EIFFEL_WORD);
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} else if (isEiffelOperator(sc.ch)) {
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sc.SetState(SCE_EIFFEL_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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static bool IsEiffelComment(Accessor &styler, int pos, int len) {
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return len>1 && styler[pos]=='-' && styler[pos+1]=='-';
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}
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static void FoldEiffelDocIndent(unsigned int startPos, int length, int,
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WordList *[], Accessor &styler) {
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int lengthDoc = startPos + length;
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// Backtrack to previous line in case need to fix its fold status
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int lineCurrent = styler.GetLine(startPos);
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if (startPos > 0) {
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if (lineCurrent > 0) {
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lineCurrent--;
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startPos = styler.LineStart(lineCurrent);
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}
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}
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int spaceFlags = 0;
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int indentCurrent = styler.IndentAmount(lineCurrent, &spaceFlags, IsEiffelComment);
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char chNext = styler[startPos];
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for (int i = startPos; i < lengthDoc; i++) {
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char ch = chNext;
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chNext = styler.SafeGetCharAt(i + 1);
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if ((ch == '\r' && chNext != '\n') || (ch == '\n') || (i == lengthDoc)) {
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int lev = indentCurrent;
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int indentNext = styler.IndentAmount(lineCurrent + 1, &spaceFlags, IsEiffelComment);
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if (!(indentCurrent & SC_FOLDLEVELWHITEFLAG)) {
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// Only non whitespace lines can be headers
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if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext & SC_FOLDLEVELNUMBERMASK)) {
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lev |= SC_FOLDLEVELHEADERFLAG;
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} else if (indentNext & SC_FOLDLEVELWHITEFLAG) {
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// Line after is blank so check the next - maybe should continue further?
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int spaceFlags2 = 0;
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int indentNext2 = styler.IndentAmount(lineCurrent + 2, &spaceFlags2, IsEiffelComment);
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if ((indentCurrent & SC_FOLDLEVELNUMBERMASK) < (indentNext2 & SC_FOLDLEVELNUMBERMASK)) {
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lev |= SC_FOLDLEVELHEADERFLAG;
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}
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}
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}
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indentCurrent = indentNext;
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styler.SetLevel(lineCurrent, lev);
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lineCurrent++;
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}
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}
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}
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static void FoldEiffelDocKeyWords(unsigned int startPos, int length, int /* initStyle */, WordList *[],
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Accessor &styler) {
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unsigned int lengthDoc = startPos + length;
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int visibleChars = 0;
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int 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 stylePrev = 0;
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int styleNext = styler.StyleAt(startPos);
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// lastDeferred should be determined by looking back to last keyword in case
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// the "deferred" is on a line before "class"
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bool lastDeferred = false;
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for (unsigned int i = startPos; i < lengthDoc; 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 ((stylePrev != SCE_EIFFEL_WORD) && (style == SCE_EIFFEL_WORD)) {
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char s[20];
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unsigned int j = 0;
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while ((j < (sizeof(s) - 1)) && (iswordchar(styler[i + j]))) {
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s[j] = styler[i + j];
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j++;
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}
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s[j] = '\0';
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if (
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(strcmp(s, "check") == 0) ||
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(strcmp(s, "debug") == 0) ||
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(strcmp(s, "deferred") == 0) ||
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(strcmp(s, "do") == 0) ||
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(strcmp(s, "from") == 0) ||
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(strcmp(s, "if") == 0) ||
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(strcmp(s, "inspect") == 0) ||
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(strcmp(s, "once") == 0)
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)
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levelCurrent++;
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if (!lastDeferred && (strcmp(s, "class") == 0))
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levelCurrent++;
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if (strcmp(s, "end") == 0)
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levelCurrent--;
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lastDeferred = strcmp(s, "deferred") == 0;
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}
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if (atEOL) {
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int lev = levelPrev;
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if (visibleChars == 0)
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lev |= SC_FOLDLEVELWHITEFLAG;
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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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stylePrev = style;
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}
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// Fill in the real level of the next line, keeping the current flags as they will be filled in later
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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 eiffelWordListDesc[] = {
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"Keywords",
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0
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};
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LexerModule lmEiffel(SCLEX_EIFFEL, ColouriseEiffelDoc, "eiffel", FoldEiffelDocIndent, eiffelWordListDesc);
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LexerModule lmEiffelkw(SCLEX_EIFFELKW, ColouriseEiffelDoc, "eiffelkw", FoldEiffelDocKeyWords, eiffelWordListDesc);
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