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// Scintilla source code edit control
/** @file LexCaml.cxx
** Lexer for Objective Caml.
**/
// Copyright 2005-2009 by Robert Roessler <robertr@rftp.com>
// The License.txt file describes the conditions under which this software may be distributed.
/* Release History
20050204 Initial release.
20050205 Quick compiler standards/"cleanliness" adjustment.
20050206 Added cast for IsLeadByte().
20050209 Changes to "external" build support.
20050306 Fix for 1st-char-in-doc "corner" case.
20050502 Fix for [harmless] one-past-the-end coloring.
20050515 Refined numeric token recognition logic.
20051125 Added 2nd "optional" keywords class.
20051129 Support "magic" (read-only) comments for RCaml.
20051204 Swtich to using StyleContext infrastructure.
20090629 Add full Standard ML '97 support.
*/
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <stdio.h>
#include <stdarg.h>
#include "Platform.h"
#include "PropSet.h"
#include "PropSetSimple.h"
#include "Accessor.h"
#include "StyleContext.h"
#include "KeyWords.h"
#include "Scintilla.h"
#include "SciLexer.h"
// Since the Microsoft __iscsym[f] funcs are not ANSI...
inline int iscaml(int c) {return isalnum(c) || c == '_';}
inline int iscamlf(int c) {return isalpha(c) || c == '_';}
static const int baseT[24] = {
0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, /* A - L */
0, 0, 8, 0, 0, 0, 0, 0, 0, 0, 0,16 /* M - X */
};
#ifdef SCI_NAMESPACE
using namespace Scintilla;
#endif
#ifdef BUILD_AS_EXTERNAL_LEXER
/*
(actually seems to work!)
*/
#include "WindowAccessor.h"
#include "ExternalLexer.h"
#if PLAT_WIN
#include <windows.h>
#endif
static void ColouriseCamlDoc(
unsigned int startPos, int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler);
static void FoldCamlDoc(
unsigned int startPos, int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler);
static void InternalLexOrFold(int lexOrFold, unsigned int startPos, int length,
int initStyle, char *words[], WindowID window, char *props);
static const char* LexerName = "caml";
#ifdef TRACE
void Platform::DebugPrintf(const char *format, ...) {
char buffer[2000];
va_list pArguments;
va_start(pArguments, format);
vsprintf(buffer,format,pArguments);
va_end(pArguments);
Platform::DebugDisplay(buffer);
}
#else
void Platform::DebugPrintf(const char *, ...) {
}
#endif
bool Platform::IsDBCSLeadByte(int codePage, char ch) {
return ::IsDBCSLeadByteEx(codePage, ch) != 0;
}
long Platform::SendScintilla(WindowID w, unsigned int msg, unsigned long wParam, long lParam) {
return ::SendMessage(reinterpret_cast<HWND>(w), msg, wParam, lParam);
}
long Platform::SendScintillaPointer(WindowID w, unsigned int msg, unsigned long wParam, void *lParam) {
return ::SendMessage(reinterpret_cast<HWND>(w), msg, wParam,
reinterpret_cast<LPARAM>(lParam));
}
void EXT_LEXER_DECL Fold(unsigned int lexer, unsigned int startPos, int length,
int initStyle, char *words[], WindowID window, char *props)
{
// below useless evaluation(s) to supress "not used" warnings
lexer;
// build expected data structures and do the Fold
InternalLexOrFold(1, startPos, length, initStyle, words, window, props);
}
int EXT_LEXER_DECL GetLexerCount()
{
return 1; // just us [Objective] Caml lexers here!
}
void EXT_LEXER_DECL GetLexerName(unsigned int Index, char *name, int buflength)
{
// below useless evaluation(s) to supress "not used" warnings
Index;
// return as much of our lexer name as will fit (what's up with Index?)
if (buflength > 0) {
buflength--;
int n = strlen(LexerName);
if (n > buflength)
n = buflength;
memcpy(name, LexerName, n), name[n] = '\0';
}
}
void EXT_LEXER_DECL Lex(unsigned int lexer, unsigned int startPos, int length,
int initStyle, char *words[], WindowID window, char *props)
{
// below useless evaluation(s) to supress "not used" warnings
lexer;
// build expected data structures and do the Lex
InternalLexOrFold(0, startPos, length, initStyle, words, window, props);
}
static void InternalLexOrFold(int foldOrLex, unsigned int startPos, int length,
int initStyle, char *words[], WindowID window, char *props)
{
// create and initialize a WindowAccessor (including contained PropSet)
PropSetSimple ps;
ps.SetMultiple(props);
WindowAccessor wa(window, ps);
// create and initialize WordList(s)
int nWL = 0;
for (; words[nWL]; nWL++) ; // count # of WordList PTRs needed
WordList** wl = new WordList* [nWL + 1];// alloc WordList PTRs
int i = 0;
for (; i < nWL; i++) {
wl[i] = new WordList(); // (works or THROWS bad_alloc EXCEPTION)
wl[i]->Set(words[i]);
}
wl[i] = 0;
// call our "internal" folder/lexer (... then do Flush!)
if (foldOrLex)
FoldCamlDoc(startPos, length, initStyle, wl, wa);
else
ColouriseCamlDoc(startPos, length, initStyle, wl, wa);
wa.Flush();
// clean up before leaving
for (i = nWL - 1; i >= 0; i--)
delete wl[i];
delete [] wl;
}
static
#endif /* BUILD_AS_EXTERNAL_LEXER */
void ColouriseCamlDoc(
unsigned int startPos, int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler)
{
// initialize styler
StyleContext sc(startPos, length, initStyle, styler);
int chBase = 0, chToken = 0, chLit = 0;
WordList& keywords = *keywordlists[0];
WordList& keywords2 = *keywordlists[1];
WordList& keywords3 = *keywordlists[2];
const bool isSML = keywords.InList("andalso");
const int useMagic = styler.GetPropertyInt("lexer.caml.magic", 0);
// set up [initial] state info (terminating states that shouldn't "bleed")
const int state_ = sc.state & 0x0f;
if (state_ <= SCE_CAML_CHAR
|| (isSML && state_ == SCE_CAML_STRING))
sc.state = SCE_CAML_DEFAULT;
int nesting = (state_ >= SCE_CAML_COMMENT)? (state_ - SCE_CAML_COMMENT): 0;
// foreach char in range...
while (sc.More()) {
// set up [per-char] state info
int state2 = -1; // (ASSUME no state change)
int chColor = sc.currentPos - 1;// (ASSUME standard coloring range)
bool advance = true; // (ASSUME scanner "eats" 1 char)
// step state machine
switch (sc.state & 0x0f) {
case SCE_CAML_DEFAULT:
chToken = sc.currentPos; // save [possible] token start (JIC)
// it's wide open; what do we have?
if (iscamlf(sc.ch))
state2 = SCE_CAML_IDENTIFIER;
else if (!isSML && sc.Match('`') && iscamlf(sc.chNext))
state2 = SCE_CAML_TAGNAME;
else if (!isSML && sc.Match('#') && isdigit(sc.chNext))
state2 = SCE_CAML_LINENUM;
else if (isdigit(sc.ch)) {
// it's a number, assume base 10
state2 = SCE_CAML_NUMBER, chBase = 10;
if (sc.Match('0')) {
// there MAY be a base specified...
const char* baseC = "bBoOxX";
if (isSML) {
if (sc.chNext == 'w')
sc.Forward(); // (consume SML "word" indicator)
baseC = "x";
}
// ... change to specified base AS REQUIRED
if (strchr(baseC, sc.chNext))
chBase = baseT[tolower(sc.chNext) - 'a'], sc.Forward();
}
} else if (!isSML && sc.Match('\'')) // (Caml char literal?)
state2 = SCE_CAML_CHAR, chLit = 0;
else if (isSML && sc.Match('#', '"')) // (SML char literal?)
state2 = SCE_CAML_CHAR, sc.Forward();
else if (sc.Match('"'))
state2 = SCE_CAML_STRING;
else if (sc.Match('(', '*'))
state2 = SCE_CAML_COMMENT, sc.Forward(), sc.ch = ' '; // (*)...
else if (strchr("!?~" /* Caml "prefix-symbol" */
"=<>@^|&+-*/$%" /* Caml "infix-symbol" */
"()[]{};,:.#", sc.ch) // Caml "bracket" or ;,:.#
// SML "extra" ident chars
|| (isSML && (sc.Match('\\') || sc.Match('`'))))
state2 = SCE_CAML_OPERATOR;
break;
case SCE_CAML_IDENTIFIER:
// [try to] interpret as [additional] identifier char
if (!(iscaml(sc.ch) || sc.Match('\''))) {
const int n = sc.currentPos - chToken;
if (n < 24) {
// length is believable as keyword, [re-]construct token
char t[24];
for (int i = -n; i < 0; i++)
t[n + i] = static_cast<char>(sc.GetRelative(i));
t[n] = '\0';
// special-case "_" token as KEYWORD
if ((n == 1 && sc.chPrev == '_') || keywords.InList(t))
sc.ChangeState(SCE_CAML_KEYWORD);
else if (keywords2.InList(t))
sc.ChangeState(SCE_CAML_KEYWORD2);
else if (keywords3.InList(t))
sc.ChangeState(SCE_CAML_KEYWORD3);
}
state2 = SCE_CAML_DEFAULT, advance = false;
}
break;
case SCE_CAML_TAGNAME:
// [try to] interpret as [additional] tagname char
if (!(iscaml(sc.ch) || sc.Match('\'')))
state2 = SCE_CAML_DEFAULT, advance = false;
break;
/*case SCE_CAML_KEYWORD:
case SCE_CAML_KEYWORD2:
case SCE_CAML_KEYWORD3:
// [try to] interpret as [additional] keyword char
if (!iscaml(ch))
state2 = SCE_CAML_DEFAULT, advance = false;
break;*/
case SCE_CAML_LINENUM:
// [try to] interpret as [additional] linenum directive char
if (!isdigit(sc.ch))
state2 = SCE_CAML_DEFAULT, advance = false;
break;
case SCE_CAML_OPERATOR: {
// [try to] interpret as [additional] operator char
const char* o = 0;
if (iscaml(sc.ch) || isspace(sc.ch) // ident or whitespace
|| (o = strchr(")]};,\'\"#", sc.ch),o) // "termination" chars
|| (!isSML && sc.Match('`')) // Caml extra term char
|| (!strchr("!$%&*+-./:<=>?@^|~", sc.ch)// "operator" chars
// SML extra ident chars
&& !(isSML && (sc.Match('\\') || sc.Match('`'))))) {
// check for INCLUSIVE termination
if (o && strchr(")]};,", sc.ch)) {
if ((sc.Match(')') && sc.chPrev == '(')
|| (sc.Match(']') && sc.chPrev == '['))
// special-case "()" and "[]" tokens as KEYWORDS
sc.ChangeState(SCE_CAML_KEYWORD);
chColor++;
} else
advance = false;
state2 = SCE_CAML_DEFAULT;
}
break;
}
case SCE_CAML_NUMBER:
// [try to] interpret as [additional] numeric literal char
if ((!isSML && sc.Match('_')) || IsADigit(sc.ch, chBase))
break;
// how about an integer suffix?
if (!isSML && (sc.Match('l') || sc.Match('L') || sc.Match('n'))
&& (sc.chPrev == '_' || IsADigit(sc.chPrev, chBase)))
break;
// or a floating-point literal?
if (chBase == 10) {
// with a decimal point?
if (sc.Match('.')
&& ((!isSML && sc.chPrev == '_')
|| IsADigit(sc.chPrev, chBase)))
break;
// with an exponent? (I)
if ((sc.Match('e') || sc.Match('E'))
&& ((!isSML && (sc.chPrev == '.' || sc.chPrev == '_'))
|| IsADigit(sc.chPrev, chBase)))
break;
// with an exponent? (II)
if (((!isSML && (sc.Match('+') || sc.Match('-')))
|| (isSML && sc.Match('~')))
&& (sc.chPrev == 'e' || sc.chPrev == 'E'))
break;
}
// it looks like we have run out of number
state2 = SCE_CAML_DEFAULT, advance = false;
break;
case SCE_CAML_CHAR:
if (!isSML) {
// [try to] interpret as [additional] char literal char
if (sc.Match('\\')) {
chLit = 1; // (definitely IS a char literal)
if (sc.chPrev == '\\')
sc.ch = ' '; // (...\\')
// should we be terminating - one way or another?
} else if ((sc.Match('\'') && sc.chPrev != '\\')
|| sc.atLineEnd) {
state2 = SCE_CAML_DEFAULT;
if (sc.Match('\''))
chColor++;
else
sc.ChangeState(SCE_CAML_IDENTIFIER);
// ... maybe a char literal, maybe not
} else if (chLit < 1 && sc.currentPos - chToken >= 2)
sc.ChangeState(SCE_CAML_IDENTIFIER), advance = false;
break;
}/* else
// fall through for SML char literal (handle like string) */
case SCE_CAML_STRING:
// [try to] interpret as [additional] [SML char/] string literal char
if (isSML && sc.Match('\\') && sc.chPrev != '\\' && isspace(sc.chNext))
state2 = SCE_CAML_WHITE;
else if (sc.Match('\\') && sc.chPrev == '\\')
sc.ch = ' '; // (...\\")
// should we be terminating - one way or another?
else if ((sc.Match('"') && sc.chPrev != '\\')
|| (isSML && sc.atLineEnd)) {
state2 = SCE_CAML_DEFAULT;
if (sc.Match('"'))
chColor++;
}
break;
case SCE_CAML_WHITE:
// [try to] interpret as [additional] SML embedded whitespace char
if (sc.Match('\\')) {
// style this puppy NOW...
state2 = SCE_CAML_STRING, sc.ch = ' ' /* (...\") */, chColor++,
styler.ColourTo(chColor, SCE_CAML_WHITE), styler.Flush();
// ... then backtrack to determine original SML literal type
int p = chColor - 2;
for (; p >= 0 && styler.StyleAt(p) == SCE_CAML_WHITE; p--) ;
if (p >= 0)
state2 = static_cast<int>(styler.StyleAt(p));
// take care of state change NOW
sc.ChangeState(state2), state2 = -1;
}
break;
case SCE_CAML_COMMENT:
case SCE_CAML_COMMENT1:
case SCE_CAML_COMMENT2:
case SCE_CAML_COMMENT3:
// we're IN a comment - does this start a NESTED comment?
if (sc.Match('(', '*'))
state2 = sc.state + 1, chToken = sc.currentPos,
sc.Forward(), sc.ch = ' ' /* (*)... */, nesting++;
// [try to] interpret as [additional] comment char
else if (sc.Match(')') && sc.chPrev == '*') {
if (nesting)
state2 = (sc.state & 0x0f) - 1, chToken = 0, nesting--;
else
state2 = SCE_CAML_DEFAULT;
chColor++;
// enable "magic" (read-only) comment AS REQUIRED
} else if (useMagic && sc.currentPos - chToken == 4
&& sc.Match('c') && sc.chPrev == 'r' && sc.GetRelative(-2) == '@')
sc.state |= 0x10; // (switch to read-only comment style)
break;
}
// handle state change and char coloring AS REQUIRED
if (state2 >= 0)
styler.ColourTo(chColor, sc.state), sc.ChangeState(state2);
// move to next char UNLESS re-scanning current char
if (advance)
sc.Forward();
}
// do any required terminal char coloring (JIC)
sc.Complete();
}
#ifdef BUILD_AS_EXTERNAL_LEXER
static
#endif /* BUILD_AS_EXTERNAL_LEXER */
void FoldCamlDoc(
unsigned int startPos, int length,
int initStyle,
WordList *keywordlists[],
Accessor &styler)
{
// below useless evaluation(s) to supress "not used" warnings
startPos || length || initStyle || keywordlists[0] || styler.Length();
}
static const char * const camlWordListDesc[] = {
"Keywords", // primary Objective Caml keywords
"Keywords2", // "optional" keywords (typically from Pervasives)
"Keywords3", // "optional" keywords (typically typenames)
0
};
#ifndef BUILD_AS_EXTERNAL_LEXER
LexerModule lmCaml(SCLEX_CAML, ColouriseCamlDoc, "caml", FoldCamlDoc, camlWordListDesc);
#endif /* BUILD_AS_EXTERNAL_LEXER */
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