327 lines
10 KiB
C++
327 lines
10 KiB
C++
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// Scintilla source code edit control
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/** @file LexRebol.cxx
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** Lexer for REBOL.
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** Written by Pascal Hurni, inspired from LexLua by Paul Winwood & Marcos E. Wurzius & Philippe Lhoste
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**
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** History:
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** 2005-04-07 First release.
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** 2005-04-10 Closing parens and brackets go now in default style
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** String and comment nesting should be more safe
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**/
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// Copyright 2005 by Pascal Hurni <pascal_hurni@fastmail.fm>
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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 IsAWordChar(const int ch) {
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return (isalnum(ch) || ch == '?' || ch == '!' || ch == '.' || ch == '\'' || ch == '+' || ch == '-' || ch == '*' || ch == '&' || ch == '|' || ch == '=' || ch == '_' || ch == '~');
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}
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static inline bool IsAWordStart(const int ch, const int ch2) {
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return ((ch == '+' || ch == '-' || ch == '.') && !isdigit(ch2)) ||
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(isalpha(ch) || ch == '?' || ch == '!' || ch == '\'' || ch == '*' || ch == '&' || ch == '|' || ch == '=' || ch == '_' || ch == '~');
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}
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static inline bool IsAnOperator(const int ch, const int ch2, const int ch3) {
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// One char operators
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if (IsASpaceOrTab(ch2)) {
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return ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '<' || ch == '>' || ch == '=' || ch == '?';
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}
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// Two char operators
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if (IsASpaceOrTab(ch3)) {
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return (ch == '*' && ch2 == '*') ||
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(ch == '/' && ch2 == '/') ||
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(ch == '<' && (ch2 == '=' || ch2 == '>')) ||
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(ch == '>' && ch2 == '=') ||
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(ch == '=' && (ch2 == '=' || ch2 == '?')) ||
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(ch == '?' && ch2 == '?');
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}
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return false;
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}
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static inline bool IsBinaryStart(const int ch, const int ch2, const int ch3, const int ch4) {
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return (ch == '#' && ch2 == '{') ||
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(IsADigit(ch) && ch2 == '#' && ch3 == '{' ) ||
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(IsADigit(ch) && IsADigit(ch2) && ch3 == '#' && ch4 == '{' );
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}
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static void ColouriseRebolDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordlists[], Accessor &styler) {
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WordList &keywords = *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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WordList &keywords5 = *keywordlists[4];
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WordList &keywords6 = *keywordlists[5];
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WordList &keywords7 = *keywordlists[6];
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WordList &keywords8 = *keywordlists[7];
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Sci_Position currentLine = styler.GetLine(startPos);
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// Initialize the braced string {.. { ... } ..} nesting level, if we are inside such a string.
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int stringLevel = 0;
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if (initStyle == SCE_REBOL_BRACEDSTRING || initStyle == SCE_REBOL_COMMENTBLOCK) {
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stringLevel = styler.GetLineState(currentLine - 1);
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}
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bool blockComment = initStyle == SCE_REBOL_COMMENTBLOCK;
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int dotCount = 0;
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// Do not leak onto next line
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if (initStyle == SCE_REBOL_COMMENTLINE) {
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initStyle = SCE_REBOL_DEFAULT;
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}
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StyleContext sc(startPos, length, initStyle, styler);
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if (startPos == 0) {
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sc.SetState(SCE_REBOL_PREFACE);
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}
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for (; sc.More(); sc.Forward()) {
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//--- What to do at line end ?
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if (sc.atLineEnd) {
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// Can be either inside a {} string or simply at eol
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if (sc.state != SCE_REBOL_BRACEDSTRING && sc.state != SCE_REBOL_COMMENTBLOCK &&
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sc.state != SCE_REBOL_BINARY && sc.state != SCE_REBOL_PREFACE)
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sc.SetState(SCE_REBOL_DEFAULT);
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// Update the line state, so it can be seen by next line
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currentLine = styler.GetLine(sc.currentPos);
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switch (sc.state) {
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case SCE_REBOL_BRACEDSTRING:
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case SCE_REBOL_COMMENTBLOCK:
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// Inside a braced string, we set the line state
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styler.SetLineState(currentLine, stringLevel);
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break;
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default:
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// Reset the line state
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styler.SetLineState(currentLine, 0);
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break;
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}
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// continue with next char
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continue;
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}
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//--- What to do on white-space ?
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if (IsASpaceOrTab(sc.ch))
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{
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// Return to default if any of these states
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if (sc.state == SCE_REBOL_OPERATOR || sc.state == SCE_REBOL_CHARACTER ||
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sc.state == SCE_REBOL_NUMBER || sc.state == SCE_REBOL_PAIR ||
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sc.state == SCE_REBOL_TUPLE || sc.state == SCE_REBOL_FILE ||
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sc.state == SCE_REBOL_DATE || sc.state == SCE_REBOL_TIME ||
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sc.state == SCE_REBOL_MONEY || sc.state == SCE_REBOL_ISSUE ||
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sc.state == SCE_REBOL_URL || sc.state == SCE_REBOL_EMAIL) {
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sc.SetState(SCE_REBOL_DEFAULT);
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}
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}
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//--- Specialize state ?
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// URL, Email look like identifier
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if (sc.state == SCE_REBOL_IDENTIFIER)
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{
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if (sc.ch == ':' && !IsASpace(sc.chNext)) {
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sc.ChangeState(SCE_REBOL_URL);
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} else if (sc.ch == '@') {
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sc.ChangeState(SCE_REBOL_EMAIL);
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} else if (sc.ch == '$') {
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sc.ChangeState(SCE_REBOL_MONEY);
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}
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}
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// Words look like identifiers
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if (sc.state == SCE_REBOL_IDENTIFIER || (sc.state >= SCE_REBOL_WORD && sc.state <= SCE_REBOL_WORD8)) {
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// Keywords ?
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if (!IsAWordChar(sc.ch) || sc.Match('/')) {
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char s[100];
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sc.GetCurrentLowered(s, sizeof(s));
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blockComment = strcmp(s, "comment") == 0;
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if (keywords8.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD8);
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} else if (keywords7.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD7);
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} else if (keywords6.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD6);
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} else if (keywords5.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD5);
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} else if (keywords4.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD4);
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} else if (keywords3.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD3);
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} else if (keywords2.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD2);
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} else if (keywords.InList(s)) {
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sc.ChangeState(SCE_REBOL_WORD);
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}
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// Keep same style if there are refinements
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if (!sc.Match('/')) {
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sc.SetState(SCE_REBOL_DEFAULT);
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}
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}
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// special numbers
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} else if (sc.state == SCE_REBOL_NUMBER) {
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switch (sc.ch) {
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case 'x': sc.ChangeState(SCE_REBOL_PAIR);
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break;
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case ':': sc.ChangeState(SCE_REBOL_TIME);
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break;
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case '-':
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case '/': sc.ChangeState(SCE_REBOL_DATE);
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break;
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case '.': if (++dotCount >= 2) sc.ChangeState(SCE_REBOL_TUPLE);
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break;
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}
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}
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//--- Determine if the current state should terminate
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if (sc.state == SCE_REBOL_QUOTEDSTRING || sc.state == SCE_REBOL_CHARACTER) {
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if (sc.ch == '^' && sc.chNext == '\"') {
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sc.Forward();
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} else if (sc.ch == '\"') {
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sc.ForwardSetState(SCE_REBOL_DEFAULT);
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}
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} else if (sc.state == SCE_REBOL_BRACEDSTRING || sc.state == SCE_REBOL_COMMENTBLOCK) {
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if (sc.ch == '}') {
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if (--stringLevel == 0) {
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sc.ForwardSetState(SCE_REBOL_DEFAULT);
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}
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} else if (sc.ch == '{') {
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stringLevel++;
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}
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} else if (sc.state == SCE_REBOL_BINARY) {
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if (sc.ch == '}') {
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sc.ForwardSetState(SCE_REBOL_DEFAULT);
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}
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} else if (sc.state == SCE_REBOL_TAG) {
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if (sc.ch == '>') {
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sc.ForwardSetState(SCE_REBOL_DEFAULT);
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}
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} else if (sc.state == SCE_REBOL_PREFACE) {
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if (sc.MatchIgnoreCase("rebol"))
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{
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int i;
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for (i=5; IsASpaceOrTab(styler.SafeGetCharAt(sc.currentPos+i, 0)); i++);
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if (sc.GetRelative(i) == '[')
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sc.SetState(SCE_REBOL_DEFAULT);
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}
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}
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//--- Parens and bracket changes to default style when the current is a number
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if (sc.state == SCE_REBOL_NUMBER || sc.state == SCE_REBOL_PAIR || sc.state == SCE_REBOL_TUPLE ||
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sc.state == SCE_REBOL_MONEY || sc.state == SCE_REBOL_ISSUE || sc.state == SCE_REBOL_EMAIL ||
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sc.state == SCE_REBOL_URL || sc.state == SCE_REBOL_DATE || sc.state == SCE_REBOL_TIME) {
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if (sc.ch == '(' || sc.ch == '[' || sc.ch == ')' || sc.ch == ']') {
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sc.SetState(SCE_REBOL_DEFAULT);
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}
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}
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//--- Determine if a new state should be entered.
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if (sc.state == SCE_REBOL_DEFAULT) {
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if (IsAnOperator(sc.ch, sc.chNext, sc.GetRelative(2))) {
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sc.SetState(SCE_REBOL_OPERATOR);
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} else if (IsBinaryStart(sc.ch, sc.chNext, sc.GetRelative(2), sc.GetRelative(3))) {
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sc.SetState(SCE_REBOL_BINARY);
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} else if (IsAWordStart(sc.ch, sc.chNext)) {
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sc.SetState(SCE_REBOL_IDENTIFIER);
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} else if (IsADigit(sc.ch) || sc.ch == '+' || sc.ch == '-' || /*Decimal*/ sc.ch == '.' || sc.ch == ',') {
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dotCount = 0;
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sc.SetState(SCE_REBOL_NUMBER);
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} else if (sc.ch == '\"') {
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sc.SetState(SCE_REBOL_QUOTEDSTRING);
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} else if (sc.ch == '{') {
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sc.SetState(blockComment ? SCE_REBOL_COMMENTBLOCK : SCE_REBOL_BRACEDSTRING);
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++stringLevel;
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} else if (sc.ch == ';') {
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sc.SetState(SCE_REBOL_COMMENTLINE);
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} else if (sc.ch == '$') {
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sc.SetState(SCE_REBOL_MONEY);
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} else if (sc.ch == '%') {
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sc.SetState(SCE_REBOL_FILE);
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} else if (sc.ch == '<') {
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sc.SetState(SCE_REBOL_TAG);
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} else if (sc.ch == '#' && sc.chNext == '"') {
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sc.SetState(SCE_REBOL_CHARACTER);
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sc.Forward();
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} else if (sc.ch == '#' && sc.chNext != '"' && sc.chNext != '{' ) {
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sc.SetState(SCE_REBOL_ISSUE);
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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 void FoldRebolDoc(Sci_PositionU startPos, Sci_Position length, int /* initStyle */, WordList *[],
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Accessor &styler) {
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Sci_PositionU lengthDoc = 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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for (Sci_PositionU 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 (style == SCE_REBOL_DEFAULT) {
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if (ch == '[') {
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levelCurrent++;
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} else if (ch == ']') {
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levelCurrent--;
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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 (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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}
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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 rebolWordListDesc[] = {
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"Keywords",
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0
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};
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LexerModule lmREBOL(SCLEX_REBOL, ColouriseRebolDoc, "rebol", FoldRebolDoc, rebolWordListDesc);
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