CodeMirror.defineMode("smalltalk", function(config, parserConfig) {
    var keywords = {"true": 1, "false": 1, nil: 1, self: 1, "super": 1, thisContext: 1};
    var indentUnit = config.indentUnit;

    function chain(stream, state, f) {
	state.tokenize = f;
	return f(stream, state);
    }

    var type;
    function ret(tp, style) {
	type = tp;
	return style;
    }

    function tokenBase(stream, state) {
	var ch = stream.next();
	if (ch == '"')
	    return chain(stream, state, tokenComment(ch));
	else if (ch == "'")
	    return chain(stream, state, tokenString(ch));
	else if (ch == "#") {
	    stream.eatWhile(/[\w\$_]/);
	    return ret("string", "string");
	}
	else if(ch == "^") {
	    return ret("return", "return");
	}
	else if(/[A-Z]/.test(ch)) {
	    stream.eatWhile(/[^\s]/);
	    return ret("className", "className");
	}
	else if (/\d/.test(ch)) {
	    stream.eatWhile(/[\w\.]/);
	    return ret("number", "number");
	}
	else if (/[\[\]()]/.test(ch)) {
	    return ret(ch, null);
	}
	else {
	    if(ch == ":") {
		if(stream.eat("=")) {
		    return ret("assignment", "assignment");
		}
	    }
	    stream.eatWhile(/[\w\$_]/);
	    if (keywords && keywords.propertyIsEnumerable(stream.current())) return ret("keyword", "keyword");
	    return ret("operator", "operator");
	}
    }

    function tokenString(quote) {
	return function(stream, state) {
	    var escaped = false, next, end = false;
	    while ((next = stream.next()) != null) {
		if (next == quote && !escaped) {end = true; break;}
		escaped = !escaped && next == "\\";
	    }
	    if (end || !(escaped))
		state.tokenize = tokenBase;
	    return ret("string", "string");
	};
    }

    function tokenComment(quote) {
	return function(stream, state) {
	    var next, end = false;
	    while ((next = stream.next()) != null) {
		if (next == quote) {end = true; break;}
	    }
	    if (end)
		state.tokenize = tokenBase;
	    return ret("comment", "comment");
	};
    }

    function Context(indented, column, type, align, prev) {
	this.indented = indented;
	this.column = column;
	this.type = type;
	this.align = align;
	this.prev = prev;
    }

    function pushContext(state, col, type) {
	return state.context = new Context(state.indented, col, type, null, state.context);
    }
    function popContext(state) {
	return state.context = state.context.prev;
    }

    // Interface

    return {
	startState: function(basecolumn) {
	    return {
		tokenize: tokenBase,
		context: new Context((basecolumn || 0) - indentUnit, 0, "top", false),
		indented: 0,
		startOfLine: true
	    };
	},

	token: function(stream, state) {
	    var ctx = state.context;
	    if (stream.sol()) {
		if (ctx.align == null) ctx.align = false;
		state.indented = stream.indentation();
		state.startOfLine = true;
	    }
	    if (stream.eatSpace()) return null;
	    var style = state.tokenize(stream, state);
	    if (type == "comment") return style;
	    if (ctx.align == null) ctx.align = true;

	    if (type == "[") pushContext(state, stream.column(), "]");
	    else if (type == "(") pushContext(state, stream.column(), ")");
	    else if (type == ctx.type) popContext(state);
	    state.startOfLine = false;
	    return style;
	},

	indent: function(state, textAfter) {
	    if (state.tokenize != tokenBase) return 0;
	    var firstChar = textAfter && textAfter.charAt(0), ctx = state.context, closing = firstChar == ctx.type;
	    if (ctx.align) return ctx.column + (closing ? 0 : 1);
	    else return ctx.indented + (closing ? 0 : indentUnit);
	},

	electricChars: "]"
    };
});

CodeMirror.defineMIME("text/x-stsrc", {name: "smalltalk"});