Haskell lexer contributed by Tobias Engvall.

1 files changed, 263 insertions, 0 deletions

diff --git a/src/LexHaskell.cxx b/src/LexHaskell.cxx
new file mode 100644
index 000000000..0e4be85c6
--- /dev/null
+++ b/src/LexHaskell.cxx
@@ -0,0 +1,263 @@
+/******************************************************************
+ *    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
+ *
+ *
+ *    TODO:
+ *    * Implement a folder :)
+ *    * Nice Character-lexing (stuff inside '\''), LexPython has
+ *      this.
+ *
+ *
+ *****************************************************************/
+
+#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"
+
+#ifdef BUILD_AS_EXTERNAL_LEXER
+
+#include "ExternalLexer.h"
+#include "WindowAccessor.h"
+
+#define BUILD_EXTERNAL_LEXER 0
+
+#endif
+
+// Max level of nested comments
+#define SCE_HA_COMMENTMAX SCE_HA_COMMENTBLOCK3
+
+
+enum kwType { kwOther, kwClass, kwData, kwInstance, kwImport, kwModule, kwType};
+
+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];
+
+   int kwLast = kwOther;
+
+   StyleContext sc(startPos, length, initStyle, styler);
+
+   for (; sc.More(); sc.Forward()) {
+
+      // Check for state end
+         // Operator
+      if (sc.state == SCE_HA_OPERATOR) {
+         kwLast = kwOther;
+         sc.SetState(SCE_HA_DEFAULT);
+      }
+         // String
+      else if (sc.state == SCE_HA_STRING) {
+         if (sc.ch == '\"') {
+            sc.ForwardSetState(SCE_HA_DEFAULT);
+         }
+      }
+         // Char
+      else if (sc.state == SCE_HA_CHARACTER) {
+         if (sc.ch == '\'') {
+            sc.ForwardSetState(SCE_HA_DEFAULT);
+         }
+      }
+         // Number
+      else if (sc.state == SCE_HA_NUMBER) {
+         if (!IsADigit(sc.ch)) {
+            sc.SetState(SCE_HA_DEFAULT);
+         }
+      }
+         // Types, constructors, etc.
+      else if (sc.state == SCE_HA_CAPITAL) {
+         if (!IsAWordChar(sc.ch) || sc.ch == '.') {
+            sc.SetState(SCE_HA_DEFAULT);
+         }
+      }
+         // Identifier
+      else if (sc.state == SCE_HA_IDENTIFIER) {
+         if (!IsAWordChar(sc.ch)) {
+            char s[100];
+            sc.GetCurrent(s, sizeof(s));
+            int style = SCE_HA_IDENTIFIER;
+            if ((kwLast == kwImport) || (strcmp(s,"qualified") == 0) || (strcmp(s,"as") == 0)) {
+               style = SCE_HA_IMPORT;
+            } else if (keywords.InList(s)) {
+               style = SCE_HA_KEYWORD;
+            } else if (kwLast == kwData) {
+               style = SCE_HA_DATA;
+            } else if (kwLast == kwClass) {
+               style = SCE_HA_CLASS;
+            } else if (kwLast == kwModule) {
+               style = SCE_HA_MODULE;
+            } else if (isupper(s[0])) {
+               style = SCE_HA_CAPITAL;
+            }
+            sc.ChangeState(style);
+            sc.SetState(SCE_HA_DEFAULT);
+            if (style == SCE_HA_KEYWORD) {
+               if (0 == strcmp(s, "class"))
+                  kwLast = kwClass;
+               else if (0 == strcmp(s, "data"))
+                  kwLast = kwData;
+               else if (0 == strcmp(s, "instance"))
+                  kwLast = kwInstance;
+               else if (0 == strcmp(s, "import"))
+                  kwLast = kwImport;
+               else if (0 == strcmp(s, "module"))
+                  kwLast = kwModule;
+               else
+                  kwLast = kwOther;
+            } else if (style == SCE_HA_CLASS || style == SCE_HA_IMPORT ||
+                       style == SCE_HA_MODULE || style == SCE_HA_CAPITAL ||
+                       style == SCE_HA_DATA || style == SCE_HA_INSTANCE) {
+               kwLast = kwOther;
+            }
+         }
+      }
+         // Comments
+            // Oneliner
+      else if (sc.state == SCE_HA_COMMENTLINE) {
+         if (IsNewline(sc.ch))
+            sc.SetState(SCE_HA_DEFAULT);
+      }
+            // Nested
+      else if (sc.state >= SCE_HA_COMMENTBLOCK) {
+         if (sc.Match("{-")) {
+            if (sc.state < SCE_HA_COMMENTMAX)
+               sc.SetState(sc.state + 1);
+         }
+         else if (sc.Match("-}")) {
+            sc.Forward();
+            if (sc.state == SCE_HA_COMMENTBLOCK)
+               sc.ForwardSetState(SCE_HA_DEFAULT);
+            else
+               sc.ForwardSetState(sc.state - 1);
+         }
+      }
+      // New state?
+      if (sc.state == SCE_HA_DEFAULT) {
+         // Digit
+         if (IsADigit(sc.ch) || (sc.ch == '.' && IsADigit(sc.chNext))) {
+            sc.SetState(SCE_HA_NUMBER);
+         }
+         // Comment line
+         else if (sc.Match("--")) {
+            sc.SetState(SCE_HA_COMMENTLINE);
+         // Comment block
+         }
+         else if (sc.Match("{-")) {
+            sc.SetState(SCE_HA_COMMENTBLOCK);
+         }
+         // String
+         else if (sc.Match('\"')) {
+            sc.SetState(SCE_HA_STRING);
+         }
+         // Character
+         else if (sc.Match('\'') && IsWhitespace(sc.GetRelative(-1)) ) {
+            sc.SetState(SCE_HA_CHARACTER);
+         }
+         // Stringstart
+         else if (sc.Match('\"')) {
+            sc.SetState(SCE_HA_STRING);
+         }
+         // Operator
+         else if (isascii(sc.ch) && isoperator(static_cast<char>(sc.ch))) {
+            sc.SetState(SCE_HA_OPERATOR);
+         }
+         // Keyword
+         else if (IsAWordStart(sc.ch)) {
+               sc.SetState(SCE_HA_IDENTIFIER);
+         }
+
+      }
+   }
+   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)
+{
+   PropSet 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");
+