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// Scintilla source code edit control
/** @file LexTAL.cxx
** Lexer for TAL
** Based on LexPascal.cxx
** Written by Laurent le Tynevez
** Updated by Simon Steele <s.steele@pnotepad.org> September 2002
** Updated by Mathias Rauen <scite@madshi.net> May 2003 (Delphi adjustments)
** Updated by Rod Falck, Aug 2006 Converted to TACL
**/

#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 "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"
#include "StyleContext.h"

#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif

inline bool isTACLoperator(char ch)
{
return ch == '\'' || isoperator(ch);
}

inline bool isTACLwordchar(char ch)
{
return ch == '#' || ch == '^' || ch == '|' || ch == '_' || iswordchar(ch);
}

inline bool isTACLwordstart(char ch)
{
return ch == '#' || ch == '|' || ch == '_' || iswordstart(ch);
}

static void getRange(unsigned int start,
unsigned int end,
Accessor &styler,
char *s,
unsigned int len) {
unsigned int i = 0;
while ((i < end - start + 1) && (i < len-1)) {
s[i] = static_cast<char>(tolower(styler[start + i]));
i++;
}
s[i] = '\0';
}

static bool IsStreamCommentStyle(int style) {
return style == SCE_C_COMMENT ||
style == SCE_C_COMMENTDOC ||
style == SCE_C_COMMENTDOCKEYWORD ||
style == SCE_C_COMMENTDOCKEYWORDERROR;
}

static void ColourTo(Accessor &styler, unsigned int end, unsigned int attr, bool bInAsm) {
if ((bInAsm) && (attr == SCE_C_OPERATOR || attr == SCE_C_NUMBER || attr == SCE_C_DEFAULT || attr == SCE_C_WORD || attr == SCE_C_IDENTIFIER)) {
styler.ColourTo(end, SCE_C_REGEX);
} else
styler.ColourTo(end, attr);
}

// returns 1 if the item starts a class definition, and -1 if the word is "end", and 2 if the word is "asm"
static int classifyWordTACL(unsigned int start, unsigned int end, /*WordList &keywords*/WordList *keywordlists[], Accessor &styler, bool bInAsm) {
int ret = 0;

WordList& keywords = *keywordlists[0];
WordList& builtins = *keywordlists[1];
WordList& commands = *keywordlists[2];

char s[100];
getRange(start, end, styler, s, sizeof(s));

char chAttr = SCE_C_IDENTIFIER;
if (isdigit(s[0]) || (s[0] == '.')) {
chAttr = SCE_C_NUMBER;
}
else {
if (s[0] == '#' || keywords.InList(s)) {
chAttr = SCE_C_WORD;

if (strcmp(s, "asm") == 0) {
ret = 2;
}
else if (strcmp(s, "end") == 0) {
ret = -1;
}
}
else if (s[0] == '|' || builtins.InList(s)) {
chAttr = SCE_C_WORD2;
}
else if (commands.InList(s)) {
chAttr = SCE_C_UUID;
}
else if (strcmp(s, "comment") == 0) {
chAttr = SCE_C_COMMENTLINE;
ret = 3;
}
}
ColourTo(styler, end, chAttr, (bInAsm && ret != -1));
return ret;
}

static int classifyFoldPointTACL(const char* s) {
int lev = 0;
if (s[0] == '[')
lev=1;
else if (s[0] == ']')
lev=-1;
return lev;
}

static void ColouriseTACLDoc(unsigned int startPos, int length, int initStyle, WordList *keywordlists[],
Accessor &styler) {

styler.StartAt(startPos);

int state = initStyle;
if (state == SCE_C_CHARACTER) // Does not leak onto next line
state = SCE_C_DEFAULT;
char chPrev = ' ';
char chNext = styler[startPos];
unsigned int lengthDoc = startPos + length;

bool bInClassDefinition;

int currentLine = styler.GetLine(startPos);
if (currentLine > 0) {
styler.SetLineState(currentLine, styler.GetLineState(currentLine-1));
bInClassDefinition = (styler.GetLineState(currentLine) == 1);
} else {
styler.SetLineState(currentLine, 0);
bInClassDefinition = false;
}

bool bInAsm = (state == SCE_C_REGEX);
if (bInAsm)
state = SCE_C_DEFAULT;

styler.StartSegment(startPos);
int visibleChars = 0;
unsigned int i;
for (i = startPos; i < lengthDoc; i++) {
char ch = chNext;

chNext = styler.SafeGetCharAt(i + 1);

if ((ch == '\r' && chNext != '\n') || (ch == '\n')) {
// Trigger on CR only (Mac style) or either on LF from CR+LF (Dos/Win) or on LF alone (Unix)
// Avoid triggering two times on Dos/Win
// End of line
if (state == SCE_C_CHARACTER) {
ColourTo(styler, i, state, bInAsm);
state = SCE_C_DEFAULT;
}
visibleChars = 0;
currentLine++;
styler.SetLineState(currentLine, (bInClassDefinition ? 1 : 0));
}

if (styler.IsLeadByte(ch)) {
chNext = styler.SafeGetCharAt(i + 2);
chPrev = ' ';
i += 1;
continue;
}

if (state == SCE_C_DEFAULT) {
if (isTACLwordstart(ch)) {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_IDENTIFIER;
} else if (ch == '{') {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_COMMENT;
} else if (ch == '{' && chNext == '*') {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_COMMENTDOC;
} else if (ch == '=' && chNext == '=') {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_COMMENTLINE;
} else if (ch == '"') {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_STRING;
} else if (ch == '?' && visibleChars == 0) {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_PREPROCESSOR;
} else if (isTACLoperator(ch)) {
ColourTo(styler, i-1, state, bInAsm);
ColourTo(styler, i, SCE_C_OPERATOR, bInAsm);
}
} else if (state == SCE_C_IDENTIFIER) {
if (!isTACLwordchar(ch)) {
int lStateChange = classifyWordTACL(styler.GetStartSegment(), i - 1, keywordlists, styler, bInAsm);

if(lStateChange == 1) {
styler.SetLineState(currentLine, 1);
bInClassDefinition = true;
} else if(lStateChange == 2) {
bInAsm = true;
} else if(lStateChange == -1) {
styler.SetLineState(currentLine, 0);
bInClassDefinition = false;
bInAsm = false;
}

if (lStateChange == 3) {
state = SCE_C_COMMENTLINE;
}
else {
state = SCE_C_DEFAULT;
chNext = styler.SafeGetCharAt(i + 1);
if (ch == '{') {
state = SCE_C_COMMENT;
} else if (ch == '{' && chNext == '*') {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_COMMENTDOC;
} else if (ch == '=' && chNext == '=') {
state = SCE_C_COMMENTLINE;
} else if (ch == '"') {
state = SCE_C_STRING;
} else if (isTACLoperator(ch)) {
ColourTo(styler, i, SCE_C_OPERATOR, bInAsm);
}
}
}
} else {
if (state == SCE_C_PREPROCESSOR) {
if ((ch == '\r' || ch == '\n') && !(chPrev == '\\' || chPrev == '\r')) {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_DEFAULT;
}
} else if (state == SCE_C_COMMENT) {
if (ch == '}' || (ch == '\r' || ch == '\n') ) {
ColourTo(styler, i, state, bInAsm);
state = SCE_C_DEFAULT;
}
} else if (state == SCE_C_COMMENTDOC) {
if (ch == '}' || (ch == '\r' || ch == '\n')) {
if (((i > styler.GetStartSegment() + 2) || (
(initStyle == SCE_C_COMMENTDOC) &&
(styler.GetStartSegment() == static_cast<unsigned int>(startPos))))) {
ColourTo(styler, i, state, bInAsm);
state = SCE_C_DEFAULT;
}
}
} else if (state == SCE_C_COMMENTLINE) {
if (ch == '\r' || ch == '\n') {
ColourTo(styler, i-1, state, bInAsm);
state = SCE_C_DEFAULT;
}
} else if (state == SCE_C_STRING) {
if (ch == '"' || ch == '\r' || ch == '\n') {
ColourTo(styler, i, state, bInAsm);
state = SCE_C_DEFAULT;
}
}
}
        if (!isspacechar(ch))
            visibleChars++;
chPrev = ch;
}

// Process to end of document
if (state == SCE_C_IDENTIFIER) {
classifyWordTACL(styler.GetStartSegment(), i - 1, keywordlists, styler, bInAsm);
}
else
ColourTo(styler, lengthDoc - 1, state, bInAsm);
}

static void FoldTACLDoc(unsigned int startPos, int length, int initStyle, WordList *[],
                            Accessor &styler) {
bool foldComment = styler.GetPropertyInt("fold.comment") != 0;
bool foldPreprocessor = styler.GetPropertyInt("fold.preprocessor") != 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;
bool section = false;

int lastStart = 0;

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 (stylePrev == SCE_C_DEFAULT && (style == SCE_C_WORD || style == SCE_C_PREPROCESSOR))
{
// Store last word start point.
lastStart = i;
}

if (stylePrev == SCE_C_WORD || stylePrev == SCE_C_PREPROCESSOR) {
if(isTACLwordchar(ch) && !isTACLwordchar(chNext)) {
char s[100];
getRange(lastStart, i, styler, s, sizeof(s));
if (stylePrev == SCE_C_PREPROCESSOR && strcmp(s, "?section") == 0)
{
section = true;
levelCurrent = 1;
levelPrev = 0;
}
else if (stylePrev == SCE_C_WORD)
levelCurrent += classifyFoldPointTACL(s);
}
}

if (style == SCE_C_OPERATOR) {
if (ch == '[') {
levelCurrent++;
} else if (ch == ']') {
levelCurrent--;
}
}
if (foldComment && (style == SCE_C_COMMENTLINE)) {
if ((ch == '/') && (chNext == '/')) {
char chNext2 = styler.SafeGetCharAt(i + 2);
if (chNext2 == '{') {
levelCurrent++;
} else if (chNext2 == '}') {
levelCurrent--;
}
}
}

if (foldPreprocessor && (style == SCE_C_PREPROCESSOR)) {
if (ch == '{' && chNext == '$') {
unsigned int j=i+2; // skip {$
while ((j<endPos) && IsASpaceOrTab(styler.SafeGetCharAt(j))) {
j++;
}
if (styler.Match(j, "region") || styler.Match(j, "if")) {
levelCurrent++;
} else if (styler.Match(j, "end")) {
levelCurrent--;
}
}
}

if (foldComment && IsStreamCommentStyle(style)) {
if (!IsStreamCommentStyle(stylePrev)) {
levelCurrent++;
} else if (!IsStreamCommentStyle(styleNext) && !atEOL) {
// Comments don't end at end of line and the next character may be unstyled.
levelCurrent--;
}
}
if (atEOL) {
int lev = levelPrev | SC_FOLDLEVELBASE;
if (visibleChars == 0 && foldCompact)
lev |= SC_FOLDLEVELWHITEFLAG;
if ((levelCurrent > levelPrev || section) && (visibleChars > 0))
lev |= SC_FOLDLEVELHEADERFLAG;
if (lev != styler.LevelAt(lineCurrent)) {
styler.SetLevel(lineCurrent, lev);
}
lineCurrent++;
levelPrev = levelCurrent;
visibleChars = 0;
section = false;
}

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 TACLWordListDesc[] = {
"Builtins",
"Labels",
"Commands",
0
};

LexerModule lmTACL(SCLEX_TACL, ColouriseTACLDoc, "TACL", FoldTACLDoc, TACLWordListDesc);
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