294 lines
8.6 KiB
C++
294 lines
8.6 KiB
C++
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// Scintilla source code edit control
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/** @file LexAVS.cxx
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** Lexer for AviSynth.
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**/
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// Copyright 2012 by Bruno Barbieri <brunorex@gmail.com>
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// Heavily based on LexPOV by Neil Hodgson
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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 IsAWordChar(const 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 isalpha(ch) || (ch != ' ' && ch != '\n' && ch != '(' && ch != '.' && 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) || ch == '.' || ch == '-' || ch == '+');
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}
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static void ColouriseAvsDoc(
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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 &keywords = *keywordlists[0];
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WordList &filters = *keywordlists[1];
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WordList &plugins = *keywordlists[2];
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WordList &functions = *keywordlists[3];
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WordList &clipProperties = *keywordlists[4];
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WordList &userDefined = *keywordlists[5];
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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_AVS_COMMENTBLOCK || initStyle == SCE_AVS_COMMENTBLOCKN) {
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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_AVS_COMMENTLINE) {
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initStyle = SCE_AVS_DEFAULT;
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}
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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_AVS_COMMENTBLOCK || sc.state == SCE_AVS_COMMENTBLOCKN) {
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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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// Determine if the current state should terminate.
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if (sc.state == SCE_AVS_OPERATOR) {
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sc.SetState(SCE_AVS_DEFAULT);
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} else if (sc.state == SCE_AVS_NUMBER) {
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// We stop the number definition on non-numerical non-dot non-sign char
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if (!IsANumberChar(sc.ch)) {
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sc.SetState(SCE_AVS_DEFAULT);
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}
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} else if (sc.state == SCE_AVS_IDENTIFIER) {
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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_AVS_KEYWORD);
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} else if (filters.InList(s)) {
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sc.ChangeState(SCE_AVS_FILTER);
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} else if (plugins.InList(s)) {
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sc.ChangeState(SCE_AVS_PLUGIN);
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} else if (functions.InList(s)) {
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sc.ChangeState(SCE_AVS_FUNCTION);
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} else if (clipProperties.InList(s)) {
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sc.ChangeState(SCE_AVS_CLIPPROP);
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} else if (userDefined.InList(s)) {
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sc.ChangeState(SCE_AVS_USERDFN);
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}
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sc.SetState(SCE_AVS_DEFAULT);
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}
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} else if (sc.state == SCE_AVS_COMMENTBLOCK) {
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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_AVS_DEFAULT);
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}
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}
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} else if (sc.state == SCE_AVS_COMMENTBLOCKN) {
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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_AVS_DEFAULT);
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}
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}
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} else if (sc.state == SCE_AVS_COMMENTLINE) {
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if (sc.atLineEnd) {
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sc.ForwardSetState(SCE_AVS_DEFAULT);
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}
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} else if (sc.state == SCE_AVS_STRING) {
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if (sc.ch == '\"') {
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sc.ForwardSetState(SCE_AVS_DEFAULT);
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}
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} else if (sc.state == SCE_AVS_TRIPLESTRING) {
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if (sc.Match("\"\"\"")) {
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sc.Forward();
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sc.Forward();
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sc.ForwardSetState(SCE_AVS_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_AVS_DEFAULT) {
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if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
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sc.SetState(SCE_AVS_NUMBER);
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} else if (IsADigit(sc.ch) || (sc.ch == ',' && IsADigit(sc.chNext))) {
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sc.Forward();
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sc.SetState(SCE_AVS_NUMBER);
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} else if (sc.Match('/', '*')) {
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blockCommentLevel = 1;
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sc.SetState(SCE_AVS_COMMENTBLOCK);
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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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blockCommentLevel = 1;
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sc.SetState(SCE_AVS_COMMENTBLOCKN);
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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.ch == '#') {
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sc.SetState(SCE_AVS_COMMENTLINE);
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} else if (sc.ch == '\"') {
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if (sc.Match("\"\"\"")) {
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sc.SetState(SCE_AVS_TRIPLESTRING);
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} else {
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sc.SetState(SCE_AVS_STRING);
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}
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} else if (isoperator(static_cast<char>(sc.ch))) {
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sc.SetState(SCE_AVS_OPERATOR);
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} else if (IsAWordStart(sc.ch)) {
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sc.SetState(SCE_AVS_IDENTIFIER);
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}
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}
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}
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// End of file: complete any pending changeState
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if (sc.state == SCE_AVS_IDENTIFIER) {
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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_AVS_KEYWORD);
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} else if (filters.InList(s)) {
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sc.ChangeState(SCE_AVS_FILTER);
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} else if (plugins.InList(s)) {
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sc.ChangeState(SCE_AVS_PLUGIN);
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} else if (functions.InList(s)) {
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sc.ChangeState(SCE_AVS_FUNCTION);
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} else if (clipProperties.InList(s)) {
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sc.ChangeState(SCE_AVS_CLIPPROP);
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} else if (userDefined.InList(s)) {
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sc.ChangeState(SCE_AVS_USERDFN);
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}
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sc.SetState(SCE_AVS_DEFAULT);
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}
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}
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sc.Complete();
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}
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static void FoldAvsDoc(
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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 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_AVS_COMMENTBLOCK) {
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if (stylePrev != SCE_AVS_COMMENTBLOCK) {
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levelCurrent++;
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} else if ((styleNext != SCE_AVS_COMMENTBLOCK) && !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_AVS_COMMENTBLOCKN) {
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if (stylePrev != SCE_AVS_COMMENTBLOCKN) {
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levelCurrent++;
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} else if ((styleNext != SCE_AVS_COMMENTBLOCKN) && !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 (style == SCE_AVS_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 avsWordLists[] = {
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"Keywords",
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"Filters",
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"Plugins",
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"Functions",
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"Clip properties",
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"User defined functions",
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0,
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};
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LexerModule lmAVS(SCLEX_AVS, ColouriseAvsDoc, "avs", FoldAvsDoc, avsWordLists);
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