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320 lines
9.4 KiB
320 lines
9.4 KiB
// Scintilla source code edit control |
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/** @file LexPOV.cxx |
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** Lexer for POV-Ray SDL (Persistance of Vision Raytracer, Scene Description Language). |
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** Written by Philippe Lhoste but this is mostly a derivative of LexCPP... |
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**/ |
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// Copyright 1998-2005 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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// Some points that distinguish from a simple C lexer: |
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// Identifiers start only by a character. |
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// No line continuation character. |
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// Strings are limited to 256 characters. |
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// Directives are similar to preprocessor commands, |
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// but we match directive keywords and colorize incorrect ones. |
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// Block comments can be nested (code stolen from my code in LexLua). |
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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(int ch) { |
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return ch < 0x80 && (isalnum(ch) || ch == '_'); |
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} |
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static inline bool IsAWordStart(int ch) { |
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return ch < 0x80 && isalpha(ch); |
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} |
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static inline bool IsANumberChar(int ch) { |
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// Not exactly following number definition (several dots are seen as OK, etc.) |
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// but probably enough in most cases. |
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return (ch < 0x80) && |
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(isdigit(ch) || toupper(ch) == 'E' || |
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ch == '.' || ch == '-' || ch == '+'); |
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} |
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static void ColourisePovDoc( |
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Sci_PositionU startPos, |
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Sci_Position length, |
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int initStyle, |
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WordList *keywordlists[], |
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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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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 block comment /* */ nesting level, if we are inside such a comment. |
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int blockCommentLevel = 0; |
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if (initStyle == SCE_POV_COMMENT) { |
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blockCommentLevel = styler.GetLineState(currentLine - 1); |
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} |
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// Do not leak onto next line |
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if (initStyle == SCE_POV_STRINGEOL || initStyle == SCE_POV_COMMENTLINE) { |
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initStyle = SCE_POV_DEFAULT; |
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} |
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short stringLen = 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.atLineEnd) { |
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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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if (sc.state == SCE_POV_COMMENT) { |
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// Inside a block comment, we set the line state |
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styler.SetLineState(currentLine, blockCommentLevel); |
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} else { |
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// Reset the line state |
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styler.SetLineState(currentLine, 0); |
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} |
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} |
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if (sc.atLineStart && (sc.state == SCE_POV_STRING)) { |
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// Prevent SCE_POV_STRINGEOL from leaking back to previous line |
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sc.SetState(SCE_POV_STRING); |
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} |
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// Determine if the current state should terminate. |
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if (sc.state == SCE_POV_OPERATOR) { |
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sc.SetState(SCE_POV_DEFAULT); |
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} else if (sc.state == SCE_POV_NUMBER) { |
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// We stop the number definition on non-numerical non-dot non-eE non-sign char |
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if (!IsANumberChar(sc.ch)) { |
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sc.SetState(SCE_POV_DEFAULT); |
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} |
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} else if (sc.state == SCE_POV_IDENTIFIER) { |
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if (!IsAWordChar(sc.ch)) { |
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char s[100]; |
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sc.GetCurrent(s, sizeof(s)); |
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if (keywords2.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD2); |
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} else if (keywords3.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD3); |
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} else if (keywords4.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD4); |
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} else if (keywords5.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD5); |
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} else if (keywords6.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD6); |
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} else if (keywords7.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD7); |
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} else if (keywords8.InList(s)) { |
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sc.ChangeState(SCE_POV_WORD8); |
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} |
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sc.SetState(SCE_POV_DEFAULT); |
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} |
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} else if (sc.state == SCE_POV_DIRECTIVE) { |
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if (!IsAWordChar(sc.ch)) { |
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char s[100]; |
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char *p; |
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sc.GetCurrent(s, sizeof(s)); |
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p = s; |
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// Skip # and whitespace between # and directive word |
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do { |
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p++; |
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} while ((*p == ' ' || *p == '\t') && *p != '\0'); |
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if (!keywords1.InList(p)) { |
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sc.ChangeState(SCE_POV_BADDIRECTIVE); |
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} |
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sc.SetState(SCE_POV_DEFAULT); |
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} |
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} else if (sc.state == SCE_POV_COMMENT) { |
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if (sc.Match('/', '*')) { |
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blockCommentLevel++; |
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sc.Forward(); |
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} else if (sc.Match('*', '/') && blockCommentLevel > 0) { |
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blockCommentLevel--; |
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sc.Forward(); |
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if (blockCommentLevel == 0) { |
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sc.ForwardSetState(SCE_POV_DEFAULT); |
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} |
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} |
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} else if (sc.state == SCE_POV_COMMENTLINE) { |
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if (sc.atLineEnd) { |
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sc.ForwardSetState(SCE_POV_DEFAULT); |
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} |
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} else if (sc.state == SCE_POV_STRING) { |
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if (sc.ch == '\\') { |
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stringLen++; |
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if (strchr("abfnrtuv0'\"", sc.chNext)) { |
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// Compound characters are counted as one. |
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// Note: for Unicode chars \u, we shouldn't count the next 4 digits... |
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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_POV_DEFAULT); |
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} else if (sc.atLineEnd) { |
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sc.ChangeState(SCE_POV_STRINGEOL); |
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sc.ForwardSetState(SCE_POV_DEFAULT); |
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} else { |
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stringLen++; |
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} |
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if (stringLen > 256) { |
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// Strings are limited to 256 chars |
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sc.SetState(SCE_POV_STRINGEOL); |
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} |
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} else if (sc.state == SCE_POV_STRINGEOL) { |
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if (sc.ch == '\\') { |
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if (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_C_DEFAULT); |
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} else if (sc.atLineEnd) { |
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sc.ForwardSetState(SCE_POV_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_POV_DEFAULT) { |
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if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) { |
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sc.SetState(SCE_POV_NUMBER); |
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} else if (IsAWordStart(sc.ch)) { |
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sc.SetState(SCE_POV_IDENTIFIER); |
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} else if (sc.Match('/', '*')) { |
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blockCommentLevel = 1; |
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sc.SetState(SCE_POV_COMMENT); |
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sc.Forward(); // Eat the * so it isn't used for the end of the comment |
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} else if (sc.Match('/', '/')) { |
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sc.SetState(SCE_POV_COMMENTLINE); |
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} else if (sc.ch == '\"') { |
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sc.SetState(SCE_POV_STRING); |
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stringLen = 0; |
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} else if (sc.ch == '#') { |
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sc.SetState(SCE_POV_DIRECTIVE); |
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// Skip whitespace between # and directive word |
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do { |
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sc.Forward(); |
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} while ((sc.ch == ' ' || sc.ch == '\t') && sc.More()); |
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if (sc.atLineEnd) { |
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sc.SetState(SCE_POV_DEFAULT); |
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} |
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} else if (isoperator(static_cast<char>(sc.ch))) { |
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sc.SetState(SCE_POV_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 void FoldPovDoc( |
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Sci_PositionU startPos, |
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Sci_Position length, |
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int initStyle, |
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WordList *[], |
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Accessor &styler) { |
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bool foldComment = styler.GetPropertyInt("fold.comment") != 0; |
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bool foldDirective = styler.GetPropertyInt("fold.directive") != 0; |
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bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0; |
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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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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 (foldComment && (style == SCE_POV_COMMENT)) { |
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if (stylePrev != SCE_POV_COMMENT) { |
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levelCurrent++; |
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} else if ((styleNext != SCE_POV_COMMENT) && !atEOL) { |
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// Comments don't end at end of line and the next character may be unstyled. |
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levelCurrent--; |
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} |
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} |
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if (foldComment && (style == SCE_POV_COMMENTLINE)) { |
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if ((ch == '/') && (chNext == '/')) { |
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char chNext2 = styler.SafeGetCharAt(i + 2); |
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if (chNext2 == '{') { |
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levelCurrent++; |
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} else if (chNext2 == '}') { |
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levelCurrent--; |
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} |
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} |
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} |
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if (foldDirective && (style == SCE_POV_DIRECTIVE)) { |
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if (ch == '#') { |
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Sci_PositionU j=i+1; |
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while ((j<endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) { |
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j++; |
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} |
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} |
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} |
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if (style == SCE_POV_OPERATOR) { |
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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 && foldCompact) |
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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 povWordLists[] = { |
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"Language directives", |
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"Objects & CSG & Appearance", |
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"Types & Modifiers & Items", |
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"Predefined Identifiers", |
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"Predefined Functions", |
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"User defined 1", |
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"User defined 2", |
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"User defined 3", |
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0, |
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}; |
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LexerModule lmPOV(SCLEX_POV, ColourisePovDoc, "pov", FoldPovDoc, povWordLists);
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