lextads3.cxx

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/** @file LexTADS3.cxx
 ** Lexer for TADS3.
 **/
/* Copyright 2005 by Michael Cartmell
 * Parts copyright 1998-2002 by Neil Hodgson <[e-mail]>
 * In particular FoldTADS3Doc is derived from FoldCppDoc
 * The License.txt file describes the conditions under which this software may
 * be distributed.
 */

/*
 * TADS3 is a language designed by Michael J. Roberts for the writing of text
 * based games.  TADS comes from Text Adventure Development System.  It has good
 * support for the processing and outputting of formatted text and much of a
 * TADS program listing consists of strings.
 *
 * TADS has two types of strings, those enclosed in single quotes (') and those
 * enclosed in double quotes (").  These strings have different symantics and
 * can be given different highlighting if desired.
 *
 * There can be embedded within both types of strings html tags
 * ( <tag key=value> ), library directives ( <.directive> ), and message
 * parameters ( {The doctor's/his} ).
 *
 * Double quoted strings can also contain interpolated expressions
 * ( << rug.moved ? ' and a hole in the floor. ' : nil >> ).  These expressions
 * may themselves contain single or double quoted strings, although the double
 * quoted strings may not contain interpolated expressions.
 *
 * These embedded constructs influence the output and formatting and are an
 * important part of a program and require highlighting.
 *
 * LINKS
 * http://www.tads.org/
 */

#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"

static const int T3_SINGLE_QUOTE = 1;
static const int T3_INT_EXPRESSION = 2;

static inline bool IsEOL(const int ch, const int chNext) {
	return (ch == '\r' && chNext != '\n') || (ch == '\n');
}

static inline bool IsASpaceOrTab(const int ch) {
	return ch == ' ' || ch == '\t';
}

static inline bool IsATADS3Operator(const int ch) {
	return ch == '=' || ch == '{' || ch == '}' || ch == '(' || ch == ')'
		|| ch == '[' || ch == ']' || ch == ',' || ch == ':' || ch == ';'
		|| ch == '+' || ch == '-' || ch == '*' || ch == '/' || ch == '%'
		|| ch == '?' || ch == '!' || ch == '<' || ch == '>' || ch == '|'
		|| ch == '@' || ch == '&' || ch == '~';
}

static inline bool IsAWordChar(const int ch) {
	return isalnum(ch) || ch == '_' || ch == '.';
}

static inline bool IsAWordStart(const int ch) {
	return isalpha(ch) || ch == '_';
}

static inline bool IsAHexDigit(const int ch) {
	int lch = tolower(ch);
	return isdigit(lch) || lch == 'a' || lch == 'b' || lch == 'c'
		|| lch == 'd' || lch == 'e' || lch == 'f';
}

static inline bool IsAnHTMLChar(int ch) {
	return isalnum(ch) || ch == '-' || ch == '_' || ch == '.';
}

static inline bool IsADirectiveChar(int ch) {
	return isalnum(ch) || isspace(ch) || ch == '-' || ch == '/';
}

static inline bool IsANumberStart(StyleContext &sc) {
	return isdigit(sc.ch)
		|| (!isdigit(sc.chPrev) && sc.ch == '.' && isdigit(sc.chNext));
}

inline static void ColouriseTADS3Operator(StyleContext &sc) {
	int initState = sc.state;
	sc.SetState(SCE_T3_OPERATOR);
	sc.ForwardSetState(initState);
}

static void ColouriseTADSHTMLString(StyleContext &sc, int &lineState) {
	int endState = sc.state;
	int chQuote = sc.ch;
	if (endState == SCE_T3_HTML_STRING) {
		if (lineState&T3_SINGLE_QUOTE) {
			endState = SCE_T3_S_STRING;
			chQuote = '"';
		} else if (lineState&T3_INT_EXPRESSION) {
			endState = SCE_T3_X_STRING;
			chQuote = '\'';
		} else {
			endState = SCE_T3_D_STRING;
			chQuote = '\'';
		}
	} else {
		sc.SetState(SCE_T3_HTML_STRING);
		sc.Forward();
	}
	int chString = chQuote == '"'? '\'': '"';

	while (sc.More()) {
		if (IsEOL(sc.ch, sc.chNext)) {
			return;
		}
		if (sc.ch == chQuote) {
			sc.ForwardSetState(endState);
			return;
		}
		if (sc.ch == chString) {
			sc.SetState(endState);
			return;
		}
		if (sc.Match('\\', static_cast<char>(chQuote))
			|| sc.Match('\\', static_cast<char>(chString))) {
			sc.Forward(2);
		} else {
			sc.Forward();
		}
	}
}

static void ColouriseTADS3HTMLTagStart(StyleContext &sc) {
	sc.SetState(SCE_T3_HTML_TAG);
	sc.Forward();
	if (sc.ch == '/') {
		sc.Forward();
	}
	while (IsAnHTMLChar(sc.ch)) {
		sc.Forward();
	}
}

static void ColouriseTADS3HTMLTag(StyleContext &sc, int &lineState) {
	int endState = sc.state;
	int chQuote = '"';
	int chString = '\'';
	switch (endState) {
		case SCE_T3_S_STRING:
			ColouriseTADS3HTMLTagStart(sc);
			sc.SetState(SCE_T3_HTML_DEFAULT);
			chQuote = '\'';
			chString = '"';
			break;
		case SCE_T3_D_STRING:
		case SCE_T3_X_STRING:
			ColouriseTADS3HTMLTagStart(sc);
			sc.SetState(SCE_T3_HTML_DEFAULT);
			break;
		case SCE_T3_HTML_DEFAULT:
			if (lineState&T3_SINGLE_QUOTE) {
				endState = SCE_T3_S_STRING;
				chQuote = '\'';
				chString = '"';
			} else if (lineState&T3_INT_EXPRESSION) {
				endState = SCE_T3_X_STRING;
			} else {
				endState = SCE_T3_D_STRING;
			}
			break;
	}

	while (sc.More()) {
		if (IsEOL(sc.ch, sc.chNext)) {
			return;
		}
		if (sc.Match('/', '>')) {
			sc.SetState(SCE_T3_HTML_TAG);
			sc.Forward(2);
			sc.SetState(endState);
			return;
		}
		if (sc.ch == '>') {
			sc.SetState(SCE_T3_HTML_TAG);
			sc.ForwardSetState(endState);
			return;
		}
		if (sc.ch == chQuote) {
			sc.SetState(endState);
			return;
		}
		if (sc.ch == chString) {
			ColouriseTADSHTMLString(sc, lineState);
		} else if (sc.ch == '=') {
			ColouriseTADS3Operator(sc);
		} else {
			sc.Forward();
		}
	}
}

static void ColouriseTADS3Keyword(StyleContext &sc,
							WordList *keywordlists[], 	unsigned int endPos) {
	char s[250];
	WordList &keywords = *keywordlists[0];
	WordList &userwords1 = *keywordlists[1];
	WordList &userwords2 = *keywordlists[2];
	WordList &userwords3 = *keywordlists[3];
	int initState = sc.state;
	sc.SetState(SCE_T3_IDENTIFIER);
	while (sc.More() && (IsAWordChar(sc.ch))) {
		sc.Forward();
	}
	sc.GetCurrent(s, sizeof(s));
	if ( strcmp(s, "is") == 0 || strcmp(s, "not") == 0) {
		// have to find if "in" is next
		int n = 1;
		while (n + sc.currentPos < endPos && IsASpaceOrTab(sc.GetRelative(n)))
			n++;
		if (sc.GetRelative(n) == 'i' && sc.GetRelative(n+1) == 'n') {
			sc.Forward(n+2);
			sc.ChangeState(SCE_T3_KEYWORD);
		}
	} else if (keywords.InList(s)) {
		sc.ChangeState(SCE_T3_KEYWORD);
	} else if (userwords3.InList(s)) {
		sc.ChangeState(SCE_T3_USER3);
	} else if (userwords2.InList(s)) {
		sc.ChangeState(SCE_T3_USER2);
	} else if (userwords1.InList(s)) {
		sc.ChangeState(SCE_T3_USER1);
	}
	sc.SetState(initState);
}

static void ColouriseTADS3MsgParam(StyleContext &sc, int &lineState) {
	int endState = sc.state;
	int chQuote = '"';
	switch (endState) {
		case SCE_T3_S_STRING:
			sc.SetState(SCE_T3_MSG_PARAM);
			sc.Forward();
			chQuote = '\'';
			break;
		case SCE_T3_D_STRING:
		case SCE_T3_X_STRING:
			sc.SetState(SCE_T3_MSG_PARAM);
			sc.Forward();
			break;
		case SCE_T3_MSG_PARAM:
			if (lineState&T3_SINGLE_QUOTE) {
				endState = SCE_T3_S_STRING;
				chQuote = '\'';
			} else if (lineState&T3_INT_EXPRESSION) {
				endState = SCE_T3_X_STRING;
			} else {
				endState = SCE_T3_D_STRING;
			}
			break;
	}
	while (sc.More() && sc.ch != '}' && sc.ch != chQuote) {
		if (IsEOL(sc.ch, sc.chNext)) {
			return;
		}
		if (sc.ch == '\\') {
			sc.Forward();
		}
		sc.Forward();
	}
	if (sc.ch == chQuote) {
		sc.SetState(endState);
	} else {
		sc.ForwardSetState(endState);
	}
}

static void ColouriseTADS3LibDirective(StyleContext &sc, int &lineState) {
	int initState = sc.state;
	int chQuote = '"';
	switch (initState) {
		case SCE_T3_S_STRING:
			sc.SetState(SCE_T3_LIB_DIRECTIVE);
			sc.Forward(2);
			chQuote = '\'';
			break;
		case SCE_T3_D_STRING:
			sc.SetState(SCE_T3_LIB_DIRECTIVE);
			sc.Forward(2);
			break;
		case SCE_T3_LIB_DIRECTIVE:
			if (lineState&T3_SINGLE_QUOTE) {
				initState = SCE_T3_S_STRING;
				chQuote = '\'';
			} else {
				initState = SCE_T3_D_STRING;
			}
			break;
	}
	while (sc.More() && IsADirectiveChar(sc.ch)) {
		if (IsEOL(sc.ch, sc.chNext)) {
			return;
		}
		sc.Forward();
	};
	if (sc.ch == '>' || !sc.More()) {
		sc.ForwardSetState(initState);
	} else if (sc.ch == chQuote) {
		sc.SetState(initState);
	} else {
		sc.ChangeState(initState);
		sc.Forward();
	}
}

static void ColouriseTADS3String(StyleContext &sc, int &lineState) {
	int chQuote = sc.ch;
	int endState = sc.state;
	switch (sc.state) {
		case SCE_T3_DEFAULT:
		case SCE_T3_X_DEFAULT:
			if (chQuote == '"') {
				if (sc.state == SCE_T3_DEFAULT) {
					sc.SetState(SCE_T3_D_STRING);
				} else {
					sc.SetState(SCE_T3_X_STRING);
				}
				lineState &= ~T3_SINGLE_QUOTE;
			} else {
				sc.SetState(SCE_T3_S_STRING);
				lineState |= T3_SINGLE_QUOTE;
			}
			sc.Forward();
			break;
		case SCE_T3_S_STRING:
			chQuote = '\'';
			endState = lineState&T3_INT_EXPRESSION ?
				SCE_T3_X_DEFAULT : SCE_T3_DEFAULT;
			break;
		case SCE_T3_D_STRING:
			chQuote = '"';
			endState = SCE_T3_DEFAULT;
			break;
		case SCE_T3_X_STRING:
			chQuote = '"';
			endState = SCE_T3_X_DEFAULT;
			break;
	}
	while (sc.More()) {
		if (IsEOL(sc.ch, sc.chNext)) {
			return;
		}
		if (sc.ch == chQuote) {
			sc.ForwardSetState(endState);
			return;
		}
		if (sc.state == SCE_T3_D_STRING && sc.Match('<', '<')) {
			lineState |= T3_INT_EXPRESSION;
			sc.SetState(SCE_T3_X_DEFAULT);
			sc.Forward(2);
			return;
		}
		if (sc.Match('\\', static_cast<char>(chQuote))) {
			sc.Forward(2);
		} else if (sc.ch == '{') {
			ColouriseTADS3MsgParam(sc, lineState);
		} else if (sc.Match('<', '.')) {
			ColouriseTADS3LibDirective(sc, lineState);
		} else if (sc.ch == '<') {
			ColouriseTADS3HTMLTag(sc, lineState);
		} else {
			sc.Forward();
		}
	}
}

static void ColouriseTADS3Comment(StyleContext &sc, int endState) {
	sc.SetState(SCE_T3_BLOCK_COMMENT);
	while (sc.More()) {
		if (IsEOL(sc.ch, sc.chNext)) {
			return;
		}
		if (sc.Match('*', '/')) {
			sc.Forward(2);
			sc.SetState(endState);
			return;
		}
		sc.Forward();
	}
}

static void ColouriseToEndOfLine(StyleContext &sc, int initState, int endState) {
	sc.SetState(initState);
	while (sc.More()) {
		if (sc.ch == '\\') {
			sc.Forward();
			if (IsEOL(sc.ch, sc.chNext)) {
					return;
			}
		}
		if (IsEOL(sc.ch, sc.chNext)) {
			sc.SetState(endState);
			return;
		}
		sc.Forward();
	}
}