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notepad-plus-plus/scintilla/lexers/LexHaskell.cxx
Don Ho 059f9977ef [UPDATE] Update Scintilla to v2.21. 
git-svn-id: svn://svn.tuxfamily.org/svnroot/notepadplus/repository/trunk@662 f5eea248-9336-0410-98b8-ebc06183d4e3
2010-09-05 22:56:27 +00:00

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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
*
* 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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