--- /dev/null
+/******************************************************************
+ * LexHaskell.cxx
+ *
+ * A haskell lexer for the scintilla code control.
+ * Some stuff "lended" from LexPython.cxx and LexCPP.cxx.
+ * External lexer stuff inspired from the caml external lexer.
+ *
+ * Written by Tobias Engvall - tumm at dtek dot chalmers dot se
+ *
+ * Several bug fixes by Krasimir Angelov - kr.angelov at gmail.com
+ *
+ * TODO:
+ * * Implement a folder :)
+ * * Nice Character-lexing (stuff inside '\''), LexPython has
+ * this.
+ *
+ *
+ *****************************************************************/
+
+#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 "PropSetSimple.h"
+#include "WordList.h"
+#include "LexAccessor.h"
+#include "Accessor.h"
+#include "StyleContext.h"
+#include "CharacterSet.h"
+#include "LexerModule.h"
+
+#ifdef SCI_NAMESPACE
+using namespace Scintilla;
+#endif
+
+#ifdef BUILD_AS_EXTERNAL_LEXER
+
+#include "ExternalLexer.h"
+#include "WindowAccessor.h"
+
+#define BUILD_EXTERNAL_LEXER 0
+
+#endif
+
+#define HA_MODE_DEFAULT 0
+#define HA_MODE_IMPORT1 1
+#define HA_MODE_IMPORT2 2
+#define HA_MODE_IMPORT3 3
+#define HA_MODE_MODULE 4
+#define HA_MODE_FFI 5
+#define HA_MODE_TYPE 6
+
+static inline bool IsNewline(const int ch) {
+ return (ch == '\n' || ch == '\r');
+}
+
+static inline bool IsWhitespace(const int ch) {
+ return ( ch == ' '
+ || ch == '\t'
+ || IsNewline(ch) );
+}
+
+static inline bool IsAWordStart(const int ch) {
+ return (ch < 0x80) && (isalnum(ch) || ch == '_');
+}
+
+static inline bool IsAWordChar(const int ch) {
+ return (ch < 0x80) && (isalnum(ch) || ch == '.' || ch == '_' || ch == '\'');
+}
+
+static void ColorizeHaskellDoc(unsigned int startPos, int length, int initStyle,
+ WordList *keywordlists[], Accessor &styler) {
+
+ WordList &keywords = *keywordlists[0];
+ WordList &ffi = *keywordlists[1];
+
+ StyleContext sc(startPos, length, initStyle, styler);
+
+ int lineCurrent = styler.GetLine(startPos);
+ int state = lineCurrent ? styler.GetLineState(lineCurrent-1)
+ : HA_MODE_DEFAULT;
+ int mode = state & 0xF;
+ int xmode = state >> 4;
+
+ while (sc.More()) {
+ // Check for state end
+
+ // Operator
+ if (sc.state == SCE_HA_OPERATOR) {
+ if (isascii(sc.ch) && isoperator(static_cast<char>(sc.ch))) {
+ sc.Forward();
+ } else {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ }
+ }
+ // String
+ else if (sc.state == SCE_HA_STRING) {
+ if (sc.ch == '\"') {
+ sc.Forward();
+ styler.ColourTo(sc.currentPos-1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ } else if (sc.ch == '\\') {
+ sc.Forward(2);
+ } else if (sc.atLineEnd) {
+ styler.ColourTo(sc.currentPos-1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ } else {
+ sc.Forward();
+ }
+ }
+ // Char
+ else if (sc.state == SCE_HA_CHARACTER) {
+ if (sc.ch == '\'') {
+ sc.Forward();
+ styler.ColourTo(sc.currentPos-1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ } else if (sc.ch == '\\') {
+ sc.Forward(2);
+ } else if (sc.atLineEnd) {
+ styler.ColourTo(sc.currentPos-1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ } else {
+ sc.Forward();
+ }
+ }
+ // Number
+ else if (sc.state == SCE_HA_NUMBER) {
+ if (IsADigit(sc.ch, xmode)) {
+ sc.Forward();
+ } else if ((xmode == 10) &&
+ (sc.ch == 'e' || sc.ch == 'E') &&
+ (IsADigit(sc.chNext) || sc.chNext == '+' || sc.chNext == '-')) {
+ sc.Forward();
+ if (sc.ch == '+' || sc.ch == '-')
+ sc.Forward();
+ } else {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ }
+ }
+ // Identifier
+ else if (sc.state == SCE_HA_IDENTIFIER) {
+ if (IsAWordChar(sc.ch)) {
+ sc.Forward();
+ } else {
+ char s[100];
+ sc.GetCurrent(s, sizeof(s));
+ int style = sc.state;
+ int new_mode = 0;
+ if (keywords.InList(s)) {
+ style = SCE_HA_KEYWORD;
+ } else if (isupper(s[0])) {
+ if (mode >= HA_MODE_IMPORT1 && mode <= HA_MODE_IMPORT3) {
+ style = SCE_HA_MODULE;
+ new_mode = HA_MODE_IMPORT2;
+ } else if (mode == HA_MODE_MODULE)
+ style = SCE_HA_MODULE;
+ else
+ style = SCE_HA_CAPITAL;
+ } else if (mode == HA_MODE_IMPORT1 &&
+ strcmp(s,"qualified") == 0) {
+ style = SCE_HA_KEYWORD;
+ new_mode = HA_MODE_IMPORT1;
+ } else if (mode == HA_MODE_IMPORT2) {
+ if (strcmp(s,"as") == 0) {
+ style = SCE_HA_KEYWORD;
+ new_mode = HA_MODE_IMPORT3;
+ } else if (strcmp(s,"hiding") == 0) {
+ style = SCE_HA_KEYWORD;
+ }
+ } else if (mode == HA_MODE_FFI) {
+ if (ffi.InList(s)) {
+ style = SCE_HA_KEYWORD;
+ new_mode = HA_MODE_FFI;
+ }
+ }
+ else if (mode == HA_MODE_TYPE) {
+ if (strcmp(s,"family") == 0)
+ style = SCE_HA_KEYWORD;
+ }
+ styler.ColourTo(sc.currentPos - 1, style);
+ if (strcmp(s,"import") == 0 && mode != HA_MODE_FFI)
+ new_mode = HA_MODE_IMPORT1;
+ else if (strcmp(s,"module") == 0)
+ new_mode = HA_MODE_MODULE;
+ else if (strcmp(s,"foreign") == 0)
+ new_mode = HA_MODE_FFI;
+ else if (strcmp(s,"type") == 0)
+ new_mode = HA_MODE_TYPE;
+ sc.ChangeState(SCE_HA_DEFAULT);
+ mode = new_mode;
+ }
+ }
+
+ // Comments
+ // Oneliner
+ else if (sc.state == SCE_HA_COMMENTLINE) {
+ if (sc.atLineEnd) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ } else {
+ sc.Forward();
+ }
+ }
+ // Nested
+ else if (sc.state == SCE_HA_COMMENTBLOCK) {
+ if (sc.Match("{-")) {
+ sc.Forward(2);
+ xmode++;
+ }
+ else if (sc.Match("-}")) {
+ sc.Forward(2);
+ xmode--;
+ if (xmode == 0) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.ChangeState(SCE_HA_DEFAULT);
+ }
+ } else {
+ if (sc.atLineEnd) {
+ // Remember the line state for future incremental lexing
+ styler.SetLineState(lineCurrent, (xmode << 4) | mode);
+ lineCurrent++;
+ }
+ sc.Forward();
+ }
+ }
+ // New state?
+ if (sc.state == SCE_HA_DEFAULT) {
+ // Digit
+ if (IsADigit(sc.ch) ||
+ (sc.ch == '.' && IsADigit(sc.chNext)) ||
+ (sc.ch == '-' && IsADigit(sc.chNext))) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.ChangeState(SCE_HA_NUMBER);
+ if (sc.ch == '0' && (sc.chNext == 'X' || sc.chNext == 'x')) {
+ // Match anything starting with "0x" or "0X", too
+ sc.Forward(2);
+ xmode = 16;
+ } else if (sc.ch == '0' && (sc.chNext == 'O' || sc.chNext == 'o')) {
+ // Match anything starting with "0x" or "0X", too
+ sc.Forward(2);
+ xmode = 8;
+ } else {
+ sc.Forward();
+ xmode = 10;
+ }
+ mode = HA_MODE_DEFAULT;
+ }
+ // Comment line
+ else if (sc.Match("--")) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward(2);
+ sc.ChangeState(SCE_HA_COMMENTLINE);
+ // Comment block
+ }
+ else if (sc.Match("{-")) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward(2);
+ sc.ChangeState(SCE_HA_COMMENTBLOCK);
+ xmode = 1;
+ }
+ // String
+ else if (sc.Match('\"')) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward();
+ sc.ChangeState(SCE_HA_STRING);
+ }
+ // Character
+ else if (sc.Match('\'')) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward();
+ sc.ChangeState(SCE_HA_CHARACTER);
+ }
+ else if (sc.ch == '(' || sc.ch == ')' ||
+ sc.ch == '{' || sc.ch == '}' ||
+ sc.ch == '[' || sc.ch == ']') {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward();
+ styler.ColourTo(sc.currentPos - 1, SCE_HA_OPERATOR);
+ mode = HA_MODE_DEFAULT;
+ }
+ // Operator
+ else if (isascii(sc.ch) && isoperator(static_cast<char>(sc.ch))) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward();
+ sc.ChangeState(SCE_HA_OPERATOR);
+ mode = HA_MODE_DEFAULT;
+ }
+ // Keyword
+ else if (IsAWordStart(sc.ch)) {
+ styler.ColourTo(sc.currentPos - 1, sc.state);
+ sc.Forward();
+ sc.ChangeState(SCE_HA_IDENTIFIER);
+ } else {
+ if (sc.atLineEnd) {
+ // Remember the line state for future incremental lexing
+ styler.SetLineState(lineCurrent, (xmode << 4) | mode);
+ lineCurrent++;
+ }
+ sc.Forward();
+ }
+ }
+ }
+ sc.Complete();
+}
+
+// External stuff - used for dynamic-loading, not implemented in wxStyledTextCtrl yet.
+// Inspired by the caml external lexer - Credits to Robert Roessler - http://www.rftp.com
+#ifdef BUILD_EXTERNAL_LEXER
+static const char* LexerName = "haskell";
+
+void EXT_LEXER_DECL Lex(unsigned int lexer, unsigned int startPos, int length, int initStyle,
+ char *words[], WindowID window, char *props)
+{
+ PropSetSimple ps;
+ ps.SetMultiple(props);
+ WindowAccessor wa(window, ps);
+
+ int nWL = 0;
+ for (; words[nWL]; nWL++) ;
+ WordList** wl = new WordList* [nWL + 1];
+ int i = 0;
+ for (; i<nWL; i++)
+ {
+ wl[i] = new WordList();
+ wl[i]->Set(words[i]);
+ }
+ wl[i] = 0;
+
+ ColorizeHaskellDoc(startPos, length, initStyle, wl, wa);
+ wa.Flush();
+ for (i=nWL-1;i>=0;i--)
+ delete wl[i];
+ delete [] wl;
+}
+
+void EXT_LEXER_DECL Fold (unsigned int lexer, unsigned int startPos, int length, int initStyle,
+ char *words[], WindowID window, char *props)
+{
+
+}
+
+int EXT_LEXER_DECL GetLexerCount()
+{
+ return 1;
+}
+
+void EXT_LEXER_DECL GetLexerName(unsigned int Index, char *name, int buflength)
+{
+ if (buflength > 0) {
+ buflength--;
+ int n = strlen(LexerName);
+ if (n > buflength)
+ n = buflength;
+ memcpy(name, LexerName, n), name[n] = '\0';
+ }
+}
+#endif
+
+LexerModule lmHaskell(SCLEX_HASKELL, ColorizeHaskellDoc, "haskell");
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