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// Scintilla source code edit control
/** @file LexForth.cxx
** Lexer for FORTH
**/
// Copyright 1998-2003 by Neil Hodgson <neilh@scintilla.org>
// The License.txt file describes the conditions under which this software may be distributed.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include <assert.h>
#include <ctype.h>
#include "ILexer.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "WordList.h"
#include "LexAccessor.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "CharacterSet.h"
#include "LexerModule.h"
using namespace Scintilla;
static inline bool IsAWordStart(int ch) {
return (ch < 0x80) && (isalnum(ch) || ch == '_' || ch == '.');
}
static inline bool IsANumChar(int ch) {
return (ch < 0x80) && (isxdigit(ch) || ch == '.' || ch == 'e' || ch == 'E' );
}
static inline bool IsASpaceChar(int ch) {
return (ch < 0x80) && isspace(ch);
}
static void ColouriseForthDoc(Sci_PositionU startPos, Sci_Position length, int initStyle, WordList *keywordLists[],
Accessor &styler) {
WordList &control = *keywordLists[0];
WordList &keyword = *keywordLists[1];
WordList &defword = *keywordLists[2];
WordList &preword1 = *keywordLists[3];
WordList &preword2 = *keywordLists[4];
WordList &strings = *keywordLists[5];
StyleContext sc(startPos, length, initStyle, styler);
for (; sc.More(); sc.Forward())
{
// Determine if the current state should terminate.
if (sc.state == SCE_FORTH_COMMENT) {
if (sc.atLineEnd) {
sc.SetState(SCE_FORTH_DEFAULT);
}
}else if (sc.state == SCE_FORTH_COMMENT_ML) {
if (sc.ch == ')') {
sc.ForwardSetState(SCE_FORTH_DEFAULT);
}
}else if (sc.state == SCE_FORTH_IDENTIFIER || sc.state == SCE_FORTH_NUMBER) {
// handle numbers here too, because what we thought was a number might
// turn out to be a keyword e.g. 2DUP
if (IsASpaceChar(sc.ch) ) {
char s[100];
sc.GetCurrentLowered(s, sizeof(s));
int newState = sc.state == SCE_FORTH_NUMBER ? SCE_FORTH_NUMBER : SCE_FORTH_DEFAULT;
if (control.InList(s)) {
sc.ChangeState(SCE_FORTH_CONTROL);
} else if (keyword.InList(s)) {
sc.ChangeState(SCE_FORTH_KEYWORD);
} else if (defword.InList(s)) {
sc.ChangeState(SCE_FORTH_DEFWORD);
} else if (preword1.InList(s)) {
sc.ChangeState(SCE_FORTH_PREWORD1);
} else if (preword2.InList(s)) {
sc.ChangeState(SCE_FORTH_PREWORD2);
} else if (strings.InList(s)) {
sc.ChangeState(SCE_FORTH_STRING);
newState = SCE_FORTH_STRING;
}
sc.SetState(newState);
}
if (sc.state == SCE_FORTH_NUMBER) {
if (IsASpaceChar(sc.ch)) {
sc.SetState(SCE_FORTH_DEFAULT);
} else if (!IsANumChar(sc.ch)) {
sc.ChangeState(SCE_FORTH_IDENTIFIER);
}
}
}else if (sc.state == SCE_FORTH_STRING) {
if (sc.ch == '\"') {
sc.ForwardSetState(SCE_FORTH_DEFAULT);
}
}else if (sc.state == SCE_FORTH_LOCALE) {
if (sc.ch == '}') {
sc.ForwardSetState(SCE_FORTH_DEFAULT);
}
}else if (sc.state == SCE_FORTH_DEFWORD) {
if (IsASpaceChar(sc.ch)) {
sc.SetState(SCE_FORTH_DEFAULT);
}
}
// Determine if a new state should be entered.
if (sc.state == SCE_FORTH_DEFAULT) {
if (sc.ch == '\\'){
sc.SetState(SCE_FORTH_COMMENT);
} else if (sc.ch == '(' &&
(sc.atLineStart || IsASpaceChar(sc.chPrev)) &&
(sc.atLineEnd || IsASpaceChar(sc.chNext))) {
sc.SetState(SCE_FORTH_COMMENT_ML);
} else if ( (sc.ch == '$' && (IsASCII(sc.chNext) && isxdigit(sc.chNext))) ) {
// number starting with $ is a hex number
sc.SetState(SCE_FORTH_NUMBER);
while(sc.More() && IsASCII(sc.chNext) && isxdigit(sc.chNext))
sc.Forward();
} else if ( (sc.ch == '%' && (IsASCII(sc.chNext) && (sc.chNext == '0' || sc.chNext == '1'))) ) {
// number starting with % is binary
sc.SetState(SCE_FORTH_NUMBER);
while(sc.More() && IsASCII(sc.chNext) && (sc.chNext == '0' || sc.chNext == '1'))
sc.Forward();
} else if ( IsASCII(sc.ch) &&
(isxdigit(sc.ch) || ((sc.ch == '.' || sc.ch == '-') && IsASCII(sc.chNext) && isxdigit(sc.chNext)) )
){
sc.SetState(SCE_FORTH_NUMBER);
} else if (IsAWordStart(sc.ch)) {
sc.SetState(SCE_FORTH_IDENTIFIER);
} else if (sc.ch == '{') {
sc.SetState(SCE_FORTH_LOCALE);
} else if (sc.ch == ':' && IsASCII(sc.chNext) && isspace(sc.chNext)) {
// highlight word definitions e.g. : GCD ( n n -- n ) ..... ;
// ^ ^^^
sc.SetState(SCE_FORTH_DEFWORD);
while(sc.More() && IsASCII(sc.chNext) && isspace(sc.chNext))
sc.Forward();
} else if (sc.ch == ';' &&
(sc.atLineStart || IsASpaceChar(sc.chPrev)) &&
(sc.atLineEnd || IsASpaceChar(sc.chNext)) ) {
// mark the ';' that ends a word
sc.SetState(SCE_FORTH_DEFWORD);
sc.ForwardSetState(SCE_FORTH_DEFAULT);
}
}
}
sc.Complete();
}
static void FoldForthDoc(Sci_PositionU, Sci_Position, int, WordList *[],
Accessor &) {
}
static const char * const forthWordLists[] = {
"control keywords",
"keywords",
"definition words",
"prewords with one argument",
"prewords with two arguments",
"string definition keywords",
0,
};
LexerModule lmForth(SCLEX_FORTH, ColouriseForthDoc, "forth", FoldForthDoc, forthWordLists);
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