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/******************************************************************
* 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");
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