1 files changed, 399 insertions, 0 deletions

diff --git a/src/LexCaml.cpp b/src/LexCaml.cpp
new file mode 100644
index 0000000..5f4fad5
--- /dev/null
+++ b/src/LexCaml.cpp
@@ -0,0 +1,399 @@
+// Scintilla source code edit control
+/** @file LexCaml.cxx
+ ** Lexer for Objective Caml.
+ **/
+// Copyright 2005 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.
+*/
+
+#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"
+
+//	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 == '_';}
+inline int iscamld(int c) {return isdigit(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 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)
+	PropSet 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);
+	// set up [initial] state info (terminating states that shouldn't "bleed")
+	int nesting = 0;
+	if (sc.state < SCE_CAML_STRING)
+		sc.state = SCE_CAML_DEFAULT;
+	if (sc.state >= SCE_CAML_COMMENT)
+		nesting = (sc.state & 0x0f) - SCE_CAML_COMMENT;
+
+	int chBase = 0, chToken = 0, chLit = 0;
+	WordList& keywords  = *keywordlists[0];
+	WordList& keywords2 = *keywordlists[1];
+	WordList& keywords3 = *keywordlists[2];
+	const int useMagic = styler.GetPropertyInt("lexer.caml.magic", 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 (sc.Match('`') && iscamlf(sc.chNext))
+				state2 = SCE_CAML_TAGNAME;
+			else if (sc.Match('#') && isdigit(sc.chNext))
+				state2 = SCE_CAML_LINENUM;
+			else if (isdigit(sc.ch)) {
+				state2 = SCE_CAML_NUMBER, chBase = 10;
+				if (sc.Match('0') && strchr("bBoOxX", sc.chNext))
+					chBase = baseT[tolower(sc.chNext) - 'a'], sc.Forward();
+			} else if (sc.Match('\''))	/* (char literal?) */
+				state2 = SCE_CAML_CHAR, chLit = 0;
+			else if (sc.Match('\"'))
+				state2 = SCE_CAML_STRING;
+			else if (sc.Match('(', '*'))
+				state2 = SCE_CAML_COMMENT,
+					sc.ch = ' ',	// (make SURE "(*)" isn't seen as a closed comment)
+					sc.Forward();
+			else if (strchr("!?~"		/* Caml "prefix-symbol" */
+					"=<>@^|&+-*/$%"		/* Caml "infix-symbol" */
+					"()[]{};,:.#", sc.ch))	/* Caml "bracket" or ;,:.# */
+				state2 = SCE_CAML_OPERATOR;
+			break;
+
+		case SCE_CAML_IDENTIFIER:
+			// [try to] interpret as [additional] identifier char
+			if (!(iscaml(sc.ch) || sc.Match('\''))) {
+				const int n = sc.currentPos - chToken;
+				if (n < 24) {
+					// length is believable as keyword, [re-]construct token
+					char t[24];
+					for (int i = -n; i < 0; i++)
+						t[n + i] = static_cast<char>(sc.GetRelative(i));
+					t[n] = '\0';
+					// special-case "_" token as KEYWORD
+					if ((n == 1 && sc.chPrev == '_') || keywords.InList(t))
+						sc.ChangeState(SCE_CAML_KEYWORD);
+					else if (keywords2.InList(t))
+						sc.ChangeState(SCE_CAML_KEYWORD2);
+					else if (keywords3.InList(t))
+						sc.ChangeState(SCE_CAML_KEYWORD3);
+				}
+				state2 = SCE_CAML_DEFAULT, advance = false;
+			}
+			break;
+
+		case SCE_CAML_TAGNAME:
+			// [try to] interpret as [additional] tagname char
+			if (!(iscaml(sc.ch) || sc.Match('\'')))
+				state2 = SCE_CAML_DEFAULT, advance = false;
+			break;
+
+		/*case SCE_CAML_KEYWORD:
+		case SCE_CAML_KEYWORD2:
+		case SCE_CAML_KEYWORD3:
+			// [try to] interpret as [additional] keyword char
+			if (!iscaml(ch))
+				state2 = SCE_CAML_DEFAULT, advance = false;
+			break;*/
+
+		case SCE_CAML_LINENUM:
+			// [try to] interpret as [additional] linenum directive char
+			if (!isdigit(sc.ch))
+				state2 = SCE_CAML_DEFAULT, advance = false;
+			break;
+
+		case SCE_CAML_OPERATOR: {
+			// [try to] interpret as [additional] operator char
+			const char* o = 0;
+			if (iscaml(sc.ch) || isspace(sc.ch)		   /* ident or whitespace */
+				|| (o = strchr(")]};,\'\"`#", sc.ch),o)/* "termination" chars */
+				|| !strchr("!$%&*+-./:<=>?@^|~", sc.ch)/* "operator" chars */) {
+				// 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
+			// N.B. - improperly accepts "extra" digits in base 2 or 8 literals
+			if (iscamld(sc.ch) || IsADigit(sc.ch, chBase))
+				break;
+			// how about an integer suffix?
+			if ((sc.Match('l') || sc.Match('L') || sc.Match('n'))
+				&& (iscamld(sc.chPrev) || IsADigit(sc.chPrev, chBase)))
+				break;
+			// or a floating-point literal?
+			if (chBase == 10) {
+				// with a decimal point?
+				if (sc.Match('.') && iscamld(sc.chPrev))
+					break;
+				// with an exponent? (I)
+				if ((sc.Match('e') || sc.Match('E'))
+					&& (iscamld(sc.chPrev) || sc.chPrev == '.'))
+					break;
+				// with an exponent? (II)
+				if ((sc.Match('+') || 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:
+			// [try to] interpret as [additional] char literal char
+			if (sc.Match('\\')) {
+				chLit = 1;	// (definitely IS a char literal)
+				if (sc.chPrev == '\\')
+					sc.ch = ' ';	// (so termination test isn't fooled)
+			// 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;
+
+		case SCE_CAML_STRING:
+			// [try to] interpret as [additional] string literal char
+			if (sc.Match('\\') && sc.chPrev == '\\')
+				sc.ch = ' ';	// (so '\\' doesn't cause us trouble)
+			else if (sc.Match('\"') && sc.chPrev != '\\')
+				state2 = SCE_CAML_DEFAULT, chColor++;
+			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.ch = ' ',	// (make SURE "(*)" isn't seen as a closed comment)
+					sc.Forward(), 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 */