mirror of
https://github.com/scratchfoundation/bgfx.git
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319 lines
9.3 KiB
C++
319 lines
9.3 KiB
C++
// 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 "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 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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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 &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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int 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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unsigned int startPos,
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int 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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unsigned int endPos = 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 styleNext = styler.StyleAt(startPos);
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int style = initStyle;
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for (unsigned int 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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unsigned int 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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