UltimateZoneBuilder/Documents/Scintilla/LexPOV.cxx

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2008-11-01 09:35:54 +00:00
// Scintilla source code edit control
/** @file LexPOV.cxx
** Lexer for POV-Ray SDL (Persistance of Vision Raytracer, Scene Description Language).
** Written by Philippe Lhoste but this is mostly a derivative of LexCPP...
**/
// Copyright 1998-2005 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
// Some points that distinguish from a simple C lexer:
// Identifiers start only by a character.
// No line continuation character.
// Strings are limited to 256 characters.
// Directives are similar to preprocessor commands,
// but we match directive keywords and colorize incorrect ones.
// Block comments can be nested (code stolen from my code in LexLua).
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdarg.h>
#include "Platform.h"
#include "PropSet.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
static inline bool IsAWordChar(int ch) {
return ch < 0x80 && (isalnum(ch) || ch == '_');
}
static inline bool IsAWordStart(int ch) {
return ch < 0x80 && isalpha(ch);
}
static inline bool IsANumberChar(int ch) {
// Not exactly following number definition (several dots are seen as OK, etc.)
// but probably enough in most cases.
return (ch < 0x80) &&
(isdigit(ch) || toupper(ch) == 'E' ||
ch == '.' || ch == '-' || ch == '+');
}
static void ColourisePovDoc(
unsigned int startPos,
int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler) {
WordList &keywords1 = *keywordlists[0];
WordList &keywords2 = *keywordlists[1];
WordList &keywords3 = *keywordlists[2];
WordList &keywords4 = *keywordlists[3];
WordList &keywords5 = *keywordlists[4];
WordList &keywords6 = *keywordlists[5];
WordList &keywords7 = *keywordlists[6];
WordList &keywords8 = *keywordlists[7];
int currentLine = styler.GetLine(startPos);
// Initialize the block comment /* */ nesting level, if we are inside such a comment.
int blockCommentLevel = 0;
if (initStyle == SCE_POV_COMMENT) {
blockCommentLevel = styler.GetLineState(currentLine - 1);
}
// Do not leak onto next line
if (initStyle == SCE_POV_STRINGEOL || initStyle == SCE_POV_COMMENTLINE) {
initStyle = SCE_POV_DEFAULT;
}
short stringLen = 0;
StyleContext sc(startPos, length, initStyle, styler);
for (; sc.More(); sc.Forward()) {
if (sc.atLineEnd) {
// Update the line state, so it can be seen by next line
currentLine = styler.GetLine(sc.currentPos);
if (sc.state == SCE_POV_COMMENT) {
// Inside a block comment, we set the line state
styler.SetLineState(currentLine, blockCommentLevel);
} else {
// Reset the line state
styler.SetLineState(currentLine, 0);
}
}
if (sc.atLineStart && (sc.state == SCE_POV_STRING)) {
// Prevent SCE_POV_STRINGEOL from leaking back to previous line
sc.SetState(SCE_POV_STRING);
}
// Determine if the current state should terminate.
if (sc.state == SCE_POV_OPERATOR) {
sc.SetState(SCE_POV_DEFAULT);
} else if (sc.state == SCE_POV_NUMBER) {
// We stop the number definition on non-numerical non-dot non-eE non-sign char
if (!IsANumberChar(sc.ch)) {
sc.SetState(SCE_POV_DEFAULT);
}
} else if (sc.state == SCE_POV_IDENTIFIER) {
if (!IsAWordChar(sc.ch)) {
char s[100];
sc.GetCurrent(s, sizeof(s));
if (keywords2.InList(s)) {
sc.ChangeState(SCE_POV_WORD2);
} else if (keywords3.InList(s)) {
sc.ChangeState(SCE_POV_WORD3);
} else if (keywords4.InList(s)) {
sc.ChangeState(SCE_POV_WORD4);
} else if (keywords5.InList(s)) {
sc.ChangeState(SCE_POV_WORD5);
} else if (keywords6.InList(s)) {
sc.ChangeState(SCE_POV_WORD6);
} else if (keywords7.InList(s)) {
sc.ChangeState(SCE_POV_WORD7);
} else if (keywords8.InList(s)) {
sc.ChangeState(SCE_POV_WORD8);
}
sc.SetState(SCE_POV_DEFAULT);
}
} else if (sc.state == SCE_POV_DIRECTIVE) {
if (!IsAWordChar(sc.ch)) {
char s[100];
char *p;
sc.GetCurrent(s, sizeof(s));
p = s;
// Skip # and whitespace between # and directive word
do {
p++;
} while ((*p == ' ' || *p == '\t') && *p != '\0');
if (!keywords1.InList(p)) {
sc.ChangeState(SCE_POV_BADDIRECTIVE);
}
sc.SetState(SCE_POV_DEFAULT);
}
} else if (sc.state == SCE_POV_COMMENT) {
if (sc.Match('/', '*')) {
blockCommentLevel++;
sc.Forward();
} else if (sc.Match('*', '/') && blockCommentLevel > 0) {
blockCommentLevel--;
sc.Forward();
if (blockCommentLevel == 0) {
sc.ForwardSetState(SCE_POV_DEFAULT);
}
}
} else if (sc.state == SCE_POV_COMMENTLINE) {
if (sc.atLineEnd) {
sc.ForwardSetState(SCE_POV_DEFAULT);
}
} else if (sc.state == SCE_POV_STRING) {
if (sc.ch == '\\') {
stringLen++;
if (strchr("abfnrtuv0'\"", sc.chNext)) {
// Compound characters are counted as one.
// Note: for Unicode chars \u, we shouldn't count the next 4 digits...
sc.Forward();
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_POV_DEFAULT);
} else if (sc.atLineEnd) {
sc.ChangeState(SCE_POV_STRINGEOL);
sc.ForwardSetState(SCE_POV_DEFAULT);
} else {
stringLen++;
}
if (stringLen > 256) {
// Strings are limited to 256 chars
sc.SetState(SCE_POV_STRINGEOL);
}
} else if (sc.state == SCE_POV_STRINGEOL) {
if (sc.ch == '\\') {
if (sc.chNext == '\"' || sc.chNext == '\\') {
sc.Forward();
}
} else if (sc.ch == '\"') {
sc.ForwardSetState(SCE_C_DEFAULT);
} else if (sc.atLineEnd) {
sc.ForwardSetState(SCE_POV_DEFAULT);
}
}
// Determine if a new state should be entered.
if (sc.state == SCE_POV_DEFAULT) {
if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
sc.SetState(SCE_POV_NUMBER);
} else if (IsAWordStart(sc.ch)) {
sc.SetState(SCE_POV_IDENTIFIER);
} else if (sc.Match('/', '*')) {
blockCommentLevel = 1;
sc.SetState(SCE_POV_COMMENT);
sc.Forward(); // Eat the * so it isn't used for the end of the comment
} else if (sc.Match('/', '/')) {
sc.SetState(SCE_POV_COMMENTLINE);
} else if (sc.ch == '\"') {
sc.SetState(SCE_POV_STRING);
stringLen = 0;
} else if (sc.ch == '#') {
sc.SetState(SCE_POV_DIRECTIVE);
// Skip whitespace between # and directive word
do {
sc.Forward();
} while ((sc.ch == ' ' || sc.ch == '\t') && sc.More());
if (sc.atLineEnd) {
sc.SetState(SCE_POV_DEFAULT);
}
} else if (isoperator(static_cast<char>(sc.ch))) {
sc.SetState(SCE_POV_OPERATOR);
}
}
}
sc.Complete();
}
static void FoldPovDoc(
unsigned int startPos,
int length,
int initStyle,
WordList *[],
Accessor &styler) {
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
bool foldDirective = styler.GetPropertyInt("fold.directive") != 0;
bool foldCompact = styler.GetPropertyInt("fold.compact", 1) != 0;
unsigned int endPos = startPos + length;
int visibleChars = 0;
int lineCurrent = styler.GetLine(startPos);
int levelPrev = styler.LevelAt(lineCurrent) & SC_FOLDLEVELNUMBERMASK;
int levelCurrent = levelPrev;
char chNext = styler[startPos];
int styleNext = styler.StyleAt(startPos);
int style = initStyle;
for (unsigned int i = startPos; i < endPos; i++) {
char ch = chNext;
chNext = styler.SafeGetCharAt(i + 1);
int stylePrev = style;
style = styleNext;
styleNext = styler.StyleAt(i + 1);
bool atEOL = (ch == '\r' && chNext != '\n') || (ch == '\n');
if (foldComment && (style == SCE_POV_COMMENT)) {
if (stylePrev != SCE_POV_COMMENT) {
levelCurrent++;
} else if ((styleNext != SCE_POV_COMMENT) && !atEOL) {
// Comments don't end at end of line and the next character may be unstyled.
levelCurrent--;
}
}
if (foldComment && (style == SCE_POV_COMMENTLINE)) {
if ((ch == '/') && (chNext == '/')) {
char chNext2 = styler.SafeGetCharAt(i + 2);
if (chNext2 == '{') {
levelCurrent++;
} else if (chNext2 == '}') {
levelCurrent--;
}
}
}
if (foldDirective && (style == SCE_POV_DIRECTIVE)) {
if (ch == '#') {
unsigned int j=i+1;
while ((j<endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) {
j++;
}
}
}
if (style == SCE_POV_OPERATOR) {
if (ch == '{') {
levelCurrent++;
} else if (ch == '}') {
levelCurrent--;
}
}
if (atEOL) {
int lev = levelPrev;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
if ((levelCurrent > levelPrev) && (visibleChars > 0))
lev |= SC_FOLDLEVELHEADERFLAG;
if (lev != styler.LevelAt(lineCurrent)) {
styler.SetLevel(lineCurrent, lev);
}
lineCurrent++;
levelPrev = levelCurrent;
visibleChars = 0;
}
if (!isspacechar(ch))
visibleChars++;
}
// Fill in the real level of the next line, keeping the current flags as they will be filled in later
int flagsNext = styler.LevelAt(lineCurrent) & ~SC_FOLDLEVELNUMBERMASK;
styler.SetLevel(lineCurrent, levelPrev | flagsNext);
}
static const char * const povWordLists[] = {
"Language directives",
"Objects & CSG & Appearance",
"Types & Modifiers & Items",
"Predefined Identifiers",
"Predefined Functions",
"User defined 1",
"User defined 2",
"User defined 3",
0,
};
LexerModule lmPOV(SCLEX_POV, ColourisePovDoc, "pov", FoldPovDoc, povWordLists);