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/******************************************************************
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* A haskell lexer for the scintilla code control.
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* Some stuff "lended" from LexPython.cxx and LexCPP.cxx.
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* External lexer stuff inspired from the caml external lexer.
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* Written by Tobias Engvall - tumm at dtek dot chalmers dot se
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* Several bug fixes by Krasimir Angelov - kr.angelov at gmail.com
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* * Implement a folder :)
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* * Nice Character-lexing (stuff inside '\''), LexPython has
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*****************************************************************/
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#include "Scintilla.h"
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#include "PropSetSimple.h"
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#include "LexAccessor.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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using namespace Scintilla;
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#ifdef BUILD_AS_EXTERNAL_LEXER
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#include "ExternalLexer.h"
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#include "WindowAccessor.h"
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#define BUILD_EXTERNAL_LEXER 0
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#define HA_MODE_DEFAULT 0
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#define HA_MODE_IMPORT1 1
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#define HA_MODE_IMPORT2 2
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#define HA_MODE_IMPORT3 3
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#define HA_MODE_MODULE 4
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#define HA_MODE_TYPE 6
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static inline bool IsNewline(const int ch) {
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return (ch == '\n' || ch == '\r');
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static inline bool IsWhitespace(const int ch) {
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static inline bool IsAWordStart(const int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '_');
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static inline bool IsAWordChar(const int ch) {
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return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_' || ch == '\'');
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static void ColorizeHaskellDoc(unsigned int startPos, int length, int initStyle,
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WordList *keywordlists[], Accessor &styler) {
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WordList &keywords = *keywordlists[0];
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WordList &ffi = *keywordlists[1];
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StyleContext sc(startPos, length, initStyle, styler);
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int lineCurrent = styler.GetLine(startPos);
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int state = lineCurrent ? styler.GetLineState(lineCurrent-1)
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int mode = state & 0xF;
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int xmode = state >> 4;
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// Check for state end
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if (sc.state == SCE_HA_OPERATOR) {
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if (isascii(sc.ch) && isoperator(static_cast<char>(sc.ch))) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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else if (sc.state == SCE_HA_STRING) {
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styler.ColourTo(sc.currentPos-1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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} else if (sc.ch == '\\') {
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} else if (sc.atLineEnd) {
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styler.ColourTo(sc.currentPos-1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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else if (sc.state == SCE_HA_CHARACTER) {
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styler.ColourTo(sc.currentPos-1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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} else if (sc.ch == '\\') {
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} else if (sc.atLineEnd) {
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styler.ColourTo(sc.currentPos-1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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else if (sc.state == SCE_HA_NUMBER) {
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if (IsADigit(sc.ch, xmode)) {
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} else if ((xmode == 10) &&
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(sc.ch == 'e' || sc.ch == 'E') &&
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(IsADigit(sc.chNext) || sc.chNext == '+' || sc.chNext == '-')) {
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if (sc.ch == '+' || sc.ch == '-')
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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else if (sc.state == SCE_HA_IDENTIFIER) {
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if (IsAWordChar(sc.ch)) {
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sc.GetCurrent(s, sizeof(s));
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int style = sc.state;
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if (keywords.InList(s)) {
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style = SCE_HA_KEYWORD;
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} else if (isupper(s[0])) {
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if (mode >= HA_MODE_IMPORT1 && mode <= HA_MODE_IMPORT3) {
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style = SCE_HA_MODULE;
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new_mode = HA_MODE_IMPORT2;
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} else if (mode == HA_MODE_MODULE)
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style = SCE_HA_MODULE;
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style = SCE_HA_CAPITAL;
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} else if (mode == HA_MODE_IMPORT1 &&
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strcmp(s,"qualified") == 0) {
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style = SCE_HA_KEYWORD;
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new_mode = HA_MODE_IMPORT1;
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} else if (mode == HA_MODE_IMPORT2) {
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if (strcmp(s,"as") == 0) {
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style = SCE_HA_KEYWORD;
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new_mode = HA_MODE_IMPORT3;
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} else if (strcmp(s,"hiding") == 0) {
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style = SCE_HA_KEYWORD;
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} else if (mode == HA_MODE_FFI) {
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style = SCE_HA_KEYWORD;
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new_mode = HA_MODE_FFI;
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else if (mode == HA_MODE_TYPE) {
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if (strcmp(s,"family") == 0)
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style = SCE_HA_KEYWORD;
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styler.ColourTo(sc.currentPos - 1, style);
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if (strcmp(s,"import") == 0 && mode != HA_MODE_FFI)
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new_mode = HA_MODE_IMPORT1;
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else if (strcmp(s,"module") == 0)
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new_mode = HA_MODE_MODULE;
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else if (strcmp(s,"foreign") == 0)
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new_mode = HA_MODE_FFI;
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else if (strcmp(s,"type") == 0)
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new_mode = HA_MODE_TYPE;
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sc.ChangeState(SCE_HA_DEFAULT);
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else if (sc.state == SCE_HA_COMMENTLINE) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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else if (sc.state == SCE_HA_COMMENTBLOCK) {
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if (sc.Match("{-")) {
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else if (sc.Match("-}")) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_DEFAULT);
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// Remember the line state for future incremental lexing
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styler.SetLineState(lineCurrent, (xmode << 4) | mode);
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if (sc.state == SCE_HA_DEFAULT) {
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if (IsADigit(sc.ch) ||
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(sc.ch == '.' && IsADigit(sc.chNext)) ||
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(sc.ch == '-' && IsADigit(sc.chNext))) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_NUMBER);
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if (sc.ch == '0' && (sc.chNext == 'X' || sc.chNext == 'x')) {
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// Match anything starting with "0x" or "0X", too
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} else if (sc.ch == '0' && (sc.chNext == 'O' || sc.chNext == 'o')) {
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// Match anything starting with "0x" or "0X", too
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mode = HA_MODE_DEFAULT;
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else if (sc.Match("--")) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_COMMENTLINE);
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else if (sc.Match("{-")) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_COMMENTBLOCK);
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else if (sc.Match('\"')) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_STRING);
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else if (sc.Match('\'')) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_CHARACTER);
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else if (sc.ch == '(' || sc.ch == ')' ||
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sc.ch == '{' || sc.ch == '}' ||
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sc.ch == '[' || sc.ch == ']') {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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styler.ColourTo(sc.currentPos - 1, SCE_HA_OPERATOR);
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mode = HA_MODE_DEFAULT;
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else if (isascii(sc.ch) && isoperator(static_cast<char>(sc.ch))) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_OPERATOR);
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mode = HA_MODE_DEFAULT;
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else if (IsAWordStart(sc.ch)) {
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styler.ColourTo(sc.currentPos - 1, sc.state);
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sc.ChangeState(SCE_HA_IDENTIFIER);
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// Remember the line state for future incremental lexing
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styler.SetLineState(lineCurrent, (xmode << 4) | mode);
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// External stuff - used for dynamic-loading, not implemented in wxStyledTextCtrl yet.
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// Inspired by the caml external lexer - Credits to Robert Roessler - http://www.rftp.com
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#ifdef BUILD_EXTERNAL_LEXER
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static const char* LexerName = "haskell";
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void EXT_LEXER_DECL Lex(unsigned int lexer, unsigned int startPos, int length, int initStyle,
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char *words[], WindowID window, char *props)
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ps.SetMultiple(props);
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WindowAccessor wa(window, ps);
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for (; words[nWL]; nWL++) ;
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WordList** wl = new WordList* [nWL + 1];
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wl[i] = new WordList();
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wl[i]->Set(words[i]);
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ColorizeHaskellDoc(startPos, length, initStyle, wl, wa);
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for (i=nWL-1;i>=0;i--)
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void EXT_LEXER_DECL Fold (unsigned int lexer, unsigned int startPos, int length, int initStyle,
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char *words[], WindowID window, char *props)
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int EXT_LEXER_DECL GetLexerCount()
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void EXT_LEXER_DECL GetLexerName(unsigned int Index, char *name, int buflength)
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int n = strlen(LexerName);
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memcpy(name, LexerName, n), name[n] = '\0';
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LexerModule lmHaskell(SCLEX_HASKELL, ColorizeHaskellDoc, "haskell");