// ----- Utils -----

true  = (1 == 1);
false = (1 == 0);

Object.contains(item) {
    for (i in self.length()) {
        if (self[i] == item) {
            return 1;
        }
    }
    return nil;
}

with(namespace) {

    //print("--- With ", namespace, " ---\n\n");

    if (__namespaces__.length() == 0) {
        __namespaces__.push([]);
    }

    if (!__namespaces__.keys().contains(namespace)) {
        newNamespace = [__nsname__: namespace];
        __namespaces__[namespace] = newNamespace;
        __namespaces__[0][namespace] = newNamespace;
    } else {
        __namespaces__[0][namespace] = __namespaces__[namespace];
    }

    __namespaces__.push(__namespaces__[namespace]);
    return __namespaces__[namespace];
}

//without();       // latest
//without(#peg);   // remove a plate from the middle the pile without smashing everything
//without(all: 1); // ALL

without(namespace, all: nil) {

    // Remove all
    if (all != nil) {
        for (i in (__namespaces__.length() - 1)) {
            removedNamespace = __namespaces__.pop().__nsname__;
            //print("--- Without ", removedNamespace, " ---\n\n");
            __namespaces__[0][removedNamespace] = nil;
        }
        __namespaces__.pop();
        return;
    }

    // Remove last
    if (namespace == nil) {
        removedNamespace = __namespaces__.pop().__nsname__;
        //print("--- Without ", removedNamespace, " ---\n\n");
        __namespaces__[0][removedNamespace] = nil;
        if (__namespaces__.length() == 1) {
            __namespaces__.pop();
        }
        return;
    }

    // Remove a given namespace
    // Find its index
    namespaceIndex = nil;
    for (i from (__namespaces__.length() - 1) to 1) {
        if (__namespaces__[i].__nsname__ == namespace) {
            namespaceIndex = i;
            break;
        }
    }

    // If it's on top of the stack, just pop
    if (namespaceIndex == __namespaces__.length() - 1) {
        __namespaces__.pop();
        //print("--- Without ", namespace, " ---\n\n");
        __namespaces__[0][namespace] = nil;
        if (__namespaces__.length() == 1) {
            __namespaces__.pop();
        }
        return;
    }

    // If it's not on top, offset all the namespaces on top of it by one, and then pop
    for (i from namespaceIndex to (__namespaces__.length() - 2)) {
        __namespaces__[i] = __namespaces__[i + 1];
    }
    __namespaces__.pop();
    //print("--- Without ", namespace, " ---\n\n");
    __namespaces__[0][namespace] = nil;
    if (__namespaces__.length() == 1) {
        __namespaces__.pop();
    }
}

get(__identifier) {
    eval(GetVar.new(name: __identifier));
}

setInTopNamespace(__identifier, __value) {
    __namespaces__.last()[__identifier] = __value;
}

println(x) {
    if (!x) {
        if (len(__env__().__delegate__) == 0){
            print("\n");
        } else {
            print(nil, "\n");
        }
    } else {
        print(x, "\n", full: 1);
    }
}

Object.subtype(name) { self.new(__name__: name) }

Object.last() { self[self.length() - 1] }

// Input stream

//Stream = Object.subtype(#Stream);

//newStream(string) {
//  self = Stream.new(
//    content:  string,
//    position: 0,
//    limit:    len(string)
//  );
//  self;
//}

//Stream.atEnd() { self.position >= self.limit }
Stream.peek()  { !self.atEnd() && self.content[self.position] }
//Stream.inc()   { !self.atEnd() && { self.position = self.position + 1; } }

//Stream.setLastBegin = () { self.lastBegin = self.position; };

// Context

Context = Object.subtype(#Context);
Context.init() { self.variables = []; self; }
Context.declareVariable(var) { 
    local found = 0;
    for (key in self.variables.keys()) {
        if (key == var) {
            found = 1;
        }
    }
    if (found == 0) {
        self.variables[var] = nil;
    }
}

// ----- Grammar Constructs -----

// String Literal

StringLiteral = Object.subtype(#StringLiteral);

StringLiteral.match(stream, context, actions) {
    if (stream.match(self.string)) {
        stream.position += len(self.string);
        true;
    } else {
        false;
    }
}

StringLiteral.getMatchingExpression() {
    //return `(@stream).match(@self.string) && ((@stream).position += len(@self.string)) && @true;
    return `{
        if (stream.match(@self.string)) {
            stream.position += len(@self.string);
            @true;
        } else {
            @false;
        }
    };
}

//StringLiteral.match(stream, context, actions) { 
//
//    n = len(self.string);
//    i = 0;
//    success = 1;
//    if (stream.atEnd()) { success = 0; }
//    startPosition = stream.position;
//
//    while(i < n && success == 1) {
//        if (self.string[i] != stream.peek()) {
//            success = 0;
//            stream.position = startPosition;
//
//        } else {
//            i = i + 1;
//            stream.inc();
//        }
//    }
//    success;
//}

// Character Class

CharacterClass = Object.subtype(#CharacterClass);

CharacterClass.match(stream, context, actions) {

    local classLength = len(self.value);
    local i = 0;
    local prevChar = nil;
    local success = 0;

    while (i < classLength && success == 0 && !stream.atEnd()) {

        // [a] case
        if (prevChar == nil) {
            // println("[a] case");
            prevChar = self.value[i];

            if (stream.peek() == self.value[i]) {
                success = 1;
            }

        } else if (prevChar != nil && self.value[i] == '-') {

            // [a-z] case
            if (i+1 < classLength) {
                // println("[a-z] case");
                local rangeStart = prevChar;
                local rangeEnd = self.value[i+1];
                // print("Range Start: ", rangeStart, " | ");
                // print("Range End: ", rangeEnd, "\n");
                if (stream.peek() >= rangeStart 
                    && stream.peek() <= rangeEnd
                ) {
                    success = 1;
                }
                prevChar = nil;
                i = i + 1;

            // [a-] case
            } else {
                // println("[a-] case");
                if (stream.peek() == '-') {
                    success = 1;
                }
            }

        // [ab] case
        } else if (prevChar != nil && self.value[i] != '-') {
            // println("[ab] case");
            prevChar = self.value[i];
            if (stream.peek() == self.value[i]) {
                success = 1;
            }
        }
        // print("prevChar: ", prevChar, "\n");
        i = i + 1;
    }

    if (success == 1) {
        stream.inc();
    }

    success == 1;
}

CharacterClass.staticmatch(stream, context, actions, value) {

    local classLength = len(value);
    local i = 0;
    local prevChar = nil;
    local success = 0;

    while (i < classLength && success == 0 && !stream.atEnd()) {

        // [a] case
        if (prevChar == nil) {
            //println("[a] case");
            prevChar = value[i];

            if (stream.peek() == value[i]) {
                success = 1;
            }

        } else if (prevChar != nil && value[i] == '-') {

            // [a-z] case
            if (i+1 < classLength) {
                // println("[a-z] case");
                local rangeStart = prevChar;
                local rangeEnd = value[i+1];
                // print("Range Start: ", rangeStart, " | ");
                // print("Range End: ", rangeEnd, "\n");
                if (stream.peek() >= rangeStart 
                    && stream.peek() <= rangeEnd
                ) {
                    success = 1;
                }
                prevChar = nil;
                i = i + 1;

            // [a-] case
            } else {
                // println("[a-] case");
                if (stream.peek() == '-') {
                    success = 1;
                }
            }

        // [ab] case
        } else if (prevChar != nil && value[i] != '-') {
            // println("[ab] case");
            prevChar = value[i];
            if (stream.peek() == value[i]) {
                success = 1;
            }
        }
        // print("prevChar: ", prevChar, "\n");
        i = i + 1;
    }

    if (success == 1) {
        stream.inc();
    }

    success == 1;
}

CharacterClass.getMatchingExpression() {
    //return `CharacterClass.staticmatch(@stream, @context, @actions, @self.value);
    return `{ CharacterClass.staticmatch(stream, context, actions, @self.value) };
}

// Dot

Dot = Object.subtype(#Dot);

Dot.match(stream, context, actions) {
    if (!stream.atEnd()) {
        stream.inc();
        true;
    } else {
        false;
    }
}

Dot.getMatchingExpression() {
    //return `!(@stream).atEnd() && (@stream).inc() && @true;
    return `{ !stream.atEnd() && stream.inc() && @true };
}

// Begin

Begin = Object.subtype(#Begin);

Begin.match(stream, context, actions) {
    stream.setLastBegin();
    true;
}

Begin.getMatchingExpression() {
    //return `(@stream).setLastBegin() && true;
    return `{ stream.setLastBegin() && @true };
}

// End

End = Object.subtype(#End);

End.match(stream, context, actions) {
    context.variables.yytext = stream.content[stream.lastBegin..stream.position].unescaped();
    true;
}

End.getMatchingExpression() {
    //return `((@context.variables).yytext = (@stream.content)[(@stream).lastBegin..(@stream).position].unescaped())
    //        && true;
    return `{ (context.variables.yytext = stream.content[stream.lastBegin..stream.position].unescaped())
                && @true };
}

// Optional (? postfix operator)

Optional = Object.subtype(#Optional);

Optional.match(stream, context, actions) {
    self.expression.match(stream, context, actions);
    true;
}

Optional.getMatchingExpression() {
    //return `(@self.expression.getMatchingExpression(stream, context, actions)) || @true;
    return `{ (@self.expression.getMatchingExpression()); @true };
}

// Star

Star = Object.subtype(#Star);

Star.match(stream, context, actions) {
    while (self.expression.match(stream, context, actions)) {}
    true;
}

Star.getMatchingExpression() {
    return `{ while (@self.expression.getMatchingExpression()) {} @true };
}

// Plus

Plus = Object.subtype(#Plus);

Plus.match(stream, context, actions) {
    if (self.expression.match(stream, context, actions) == true) {
        while (self.expression.match(stream, context, actions) == true) {}
        true;
    } else {
        false;
    }
}

Plus.getMatchingExpression() {
    return `{
        if (@self.expression.getMatchingExpression()) {
            while (@self.expression.getMatchingExpression()) {}
            @true;
        } else {
            @false;
        }
    };
}

// And

And = Object.subtype(#And);

And.match(stream, context, actions) {
    local position = stream.position;

    if (self.expression.match(stream, context, actions) == true) {
        stream.position = position;
        true;
    } else {
        false;
    }
}

And.getMatchingExpression() {
    return `{
        local position = stream.position;
        if (@self.expression.getMatchingExpression()) {
            stream.position = position;
            @true;
        } else {
            @false;
        }
    };
}

// Not

Not = Object.subtype(#Not);

Not.match(stream, context, actions) {
    local position = stream.position;

    if (self.expression.match(stream, context, actions) == true) {
        stream.position = position;
        false;
    } else {
        true;
    }
}

Not.getMatchingExpression() {
    return `{
        local position = stream.position;
        if (@self.expression.getMatchingExpression()) {
            stream.position = position;
            @false;
        } else {
            @true;
        }
    };
}

// Sequence

Sequence = Object.subtype(#Sequence);

Sequence._match(stream, context, actions, index) {
    if (index == self.length() - 1) {
        return self[index].match(stream, context, actions);
    }
    self[index].match(stream, context, actions) && self._match(stream, context, actions, index + 1);
}

Sequence.match(stream, context, actions) {
    local initialActionCount = actions.length();
    local startingPosition = stream.position;

    local success = self._match(stream, context, actions, 0);

    if (success == false) {
        while (actions.length() > initialActionCount) {
            actions.pop();
        }
        stream.position = startingPosition;
    }

    success;
}


Sequence._getMatchingExpression(index) {
    if (index == self.length() - 1) {
        return self[index].getMatchingExpression();
    }
    return `(@self[index].getMatchingExpression())
            && @self._getMatchingExpression(index + 1);
}

Sequence.getMatchingExpression() {
    return `{
        local initialActionCount = actions.length();
        local startingPosition = stream.position;
        ({
            (@self._getMatchingExpression(0));
        } || { 
            while (actions.length() > initialActionCount) {
                actions.pop();
            }
            stream.position = startingPosition;
            @false;
        });
    }
}

// Alternation

Alternation = Object.subtype(#Alternation);

Alternation._match(stream, context, actions, index) {
    if (index == self.length() - 1) {
        return self[index].match(stream, context, actions);
    }
    self[index].match(stream, context, actions) || self._match(stream, context, actions, index + 1);
}

Alternation.match(stream, context, actions) {
    return self._match(stream, context, actions, 0);
}

Alternation._getMatchingExpression(index) {
    if (index == self.length() - 1) {
        return self[index].getMatchingExpression();
    }
    return `(@self[index].getMatchingExpression())
            || @self._getMatchingExpression(index + 1);
}

Alternation.getMatchingExpression() {
    return `{ @self._getMatchingExpression(0) };
}

// Action

Action = Object.subtype(#Action);

Action.match(stream, context, actions) {
    actions.push([action: self, context: context]);
    true;
}

Action.getMatchingExpression() {
    return `{ actions.push([action: @self, context: context]); @true; }
}

Action.execute(context) {

    // Declare all variables that a value is set to in the context
    for (statement in self.parseTree.body) {
        if (statement.__name__ == "SetVar") {
            context.declareVariable(statement.name);
        }
    }

    // Evaluate the parse tree and return to outer context if needed
    local returnValue = eval(self.parseTree, env: context.variables);
    if (context.outerContext != nil) {
        context.outerContext.variables[context.returnValueName] = returnValue;
    }

    returnValue;
}

// Parse-time Action

ParseTimeAction = Object.subtype(#ParseTimeAction);

ParseTimeAction.match(stream, context, actions) {
    if(self.action.execute(context)) {
        true;
    } else {
        false;
    }
}

ParseTimeAction.getMatchingExpression() {
    return `{ (@self.action).execute(context) };
}

// Assignment

Assignment = Object.subtype(#Assignment);

Assignment.match(stream, context, actions) {
    context.declareVariable(self.name);
    local innerContext = Context.new(outerContext: context, returnValueName: self.name).init();
    self.rule.match(stream, innerContext, actions);
}

Assignment.getMatchingExpression() {
    return `{
        context.declareVariable(@self.name);
        local context = Context.new(outerContext: context, returnValueName: @self.name).init();
        @self.rule.getMatchingExpression();
    }
}

// RuleCall

RuleCall = Object.subtype(#RuleCall);

RuleCall.match(stream, context, actions) {
    //if (rules[self.name] == nil) { print("Trying to call undefined rule: ", self.name, "\n"); exit(); }
    //print("calling rule ", self.name, " | ", stream.position, "\n");
    local res = get(self.name).match(stream, context, actions);
    //print("matching rule ", self.name, ": ", res, "\n");
    res;
}

RuleCall.getMatchingExpression() {
    //print("Calling rule ", self.name, "\n");
    //local res = `{get(@self.name).getMatchingExpression(@stream, @context, @actions).__eval__()};

    //if (innerContext == nil) {
        `{ Invoke.new(self: self, method: @self.name, arguments: [stream, context, actions]).__eval__() };
    //} else {
    //    `{ self.rules[@self.name](stream, @innerContext, actions) };
    //}

    //print("Pos ", stream.position, " | Called rule ", self.name, "\n");
}

// NamespacedRuleCall

NamespacedRuleCall = Object.subtype(#NamespacedRuleCall);

NamespacedRuleCall.match() {
    with(self.namespace);
    local res = get(self.name).match(stream, context, actions);
    without();
    res;
}

NamespacedRuleCall.getMatchingExpression(innerContext) {
    //return `{
    //    with(@self.namespace);
    //    local res = get(@self.name).getMatchingExpression(@stream, @context, @actions).__eval__();
    //    without();
    //    res;
    //}
    //if (innerContext == nil) {
        `{ Invoke.new(self: @get(self.namespace), method: @self.name, arguments: [stream, context, actions]).__eval__() };
    //} else {
    //    `{ (@get(self.namespace)).rules[@self.name](stream, @innerContext, actions) };
    //}
    
}

Definition = Object.subtype(#Definition);

Grammar = Object.subtype(#Grammar);

Grammar.addRulesFromNamespace(namespace) {
    for (key in __namespaces__[namespace].keys()) {
        if (key == #__nsname__) continue;
        self[key] = Closure.new(
            environment: nil,
            function: Lambda.new(
                parameters: [#stream, #context, #actions],
                body: __namespaces__[namespace][key].getMatchingExpression().body
            )
        )
    }
}

// ----- Grammar of Meta Language (Minimal) -----

with(#HardCodedMeta);

metaStatement = 
    Alternation.new()
        .push(Sequence.new()
            .push(Assignment.new(name: #b, rule: RuleCall.new(name: #block)))
            .push(Action.new(parseTree: `{ b; }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
            .push(Alternation.new()
              .push(RuleCall.new(name: #semi))
              .push(And.new(expression: RuleCall.new(name: #rbrace)))
            )
            .push(Action.new(parseTree: `{ e; }))
        );

metaExpression =
    Alternation.new(id: 1234)
        .push(Sequence.new()
            .push(Assignment.new(name: #p, rule: RuleCall.new(name: #metaPrimary)))
            .push(Alternation.new()
                .push(Sequence.new()
                    .push(RuleCall.new(name: #dot))
                    .push(Assignment.new(name: #i, rule: RuleCall.new(name: #metaId)))
                    .push(RuleCall.new(name: #assign))
                    .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
                )
                .push(Sequence.new()
                    .push(RuleCall.new(name: #lbrak))
                    .push(Assignment.new(name: #i, rule: RuleCall.new(name: #metaExpression)))
                    .push(RuleCall.new(name: #rbrak))
                    .push(RuleCall.new(name: #assign))
                    .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
                    .push(Action.new(parseTree: `{ SetArray.new(object: p, index: i, value: e); }))
                )
            )
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #i, rule: RuleCall.new(name: #metaId)))
            .push(RuleCall.new(name: #assign))
            .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
            .push(Action.new(parseTree: `{ SetVar.new(name: i, value: e); }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #pf, rule: RuleCall.new(name: #metaPostfix)))
            .push(Action.new(parseTree: `{ pf; }))
        );

metaPostfix = 
    Sequence.new()
        .push(Assignment.new(name: #p, rule: RuleCall.new(name: #metaPrimary)))
        .push(Star.new(expression: Alternation.new()
            .push(Sequence.new()
                .push(RuleCall.new(name: #dot))
                .push(Assignment.new(name: #i, rule: RuleCall.new(name: #metaId)))
                .push(Assignment.new(name: #a, rule: RuleCall.new(name: #args)))
                .push(Not.new(expression: RuleCall.new(name: #assign)))
                .push(Not.new(expression: RuleCall.new(name: #lbrace)))
                .push(Action.new(parseTree: `{ p = Invoke.new(self: p, method: i, arguments: a); }))
            )
            .push(Sequence.new()
                .push(RuleCall.new(name: #dot))
                .push(Assignment.new(name: #i, rule: RuleCall.new(name: #metaId)))
                .push(Not.new(expression: RuleCall.new(name: #assign)))
                .push(Action.new(parseTree: `{ p = GetProp.new(object: p, key: i); }))
            )
            .push(Sequence.new()
                .push(Assignment.new(name: #a, rule: RuleCall.new(name: #args)))
                .push(Not.new(expression: RuleCall.new(name: #assign)))
                .push(Not.new(expression: RuleCall.new(name: #lbrace)))
                .push(Action.new(parseTree: `{ p = Call.new(function: p, arguments: a); }))
                // TODO: Voir si c'est toujours bon avec le newApply()
            )
        ))
        .push(Action.new(parseTree: `{ p; }));

args =
    Sequence.new()
        .push(RuleCall.new(name: #lparen))
        .push(Assignment.new(name: #a, rule: RuleCall.new(name: #mklist)))
        .push(Optional.new(expression: Sequence.new()
            .push(Alternation.new()
                .push(Sequence.new()
                    .push(Assignment.new(name: #k, rule: RuleCall.new(name: #metaId)))
                    .push(RuleCall.new(name: #colon))
                    .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
                    .push(Action.new(parseTree: `{ a[k] = e; }))
                )
                .push(Sequence.new()
                    .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
                    .push(Action.new(parseTree: `{ a.push(e); }))
                )
            )
            .push(Star.new(expression: Sequence.new()
                .push(RuleCall.new(name: #comma))
                .push(Alternation.new()
                    .push(Sequence.new()
                        .push(Assignment.new(name: #k, rule: RuleCall.new(name: #metaId)))
                        .push(RuleCall.new(name: #colon))
                        .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
                        .push(Action.new(parseTree: `{ a[k] = e; }))
                    )
                    .push(Sequence.new()
                        .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
                        .push(Action.new(parseTree: `{ a.push(e); }))
                    )
                )
            ))
        ))
        .push(RuleCall.new(name: #rparen))
        .push(Action.new(parseTree: `{ a; }));
 
mklist      = Action.new(parseTree: `{ Object.new(); });

metaPrimary = 
    Alternation.new()
        .push(RuleCall.new(name: #nil))
        .push(RuleCall.new(name: #number))
        .push(RuleCall.new(name: #metaVar))
        .push(RuleCall.new(name: #metaSubExpr));

metaSubExpr = 
    Sequence.new()
        .push(RuleCall.new(name: #lparen))
        .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaExpression)))
        .push(RuleCall.new(name: #rparen))
        .push(Action.new(parseTree: `{ e; }));

block       = 
    Sequence.new()
        .push(RuleCall.new(name: #lbrace))
        .push(Assignment.new(name: #b, rule: RuleCall.new(name: #mklist)))
        .push(
            Star.new(
                expression: Sequence.new()
                    .push(Assignment.new(name: #e, rule: RuleCall.new(name: #metaStatement)))
                    .push(Action.new(parseTree: `{ b.push(e); }))
            )
        )
        .push(RuleCall.new(name: #rbrace))
        .push(Action.new(parseTree: `{ Block.new(body: b); }));

number      =
    Alternation.new()
        .push(Sequence.new()
            .push(StringLiteral.new(string: "-"))
            .push(Assignment.new(name: #n, rule: RuleCall.new(name: #unsign)))
            .push(Action.new(parseTree: `{ Unyop.new(operation: __opNeg).push(n) }))
        )
        .push(Sequence.new()
            .push(StringLiteral.new(string: "+"))
            .push(Assignment.new(name: #n, rule: RuleCall.new(name: #number)))
            .push(Action.new(parseTree: `{ n }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #n, rule: RuleCall.new(name: #unsign)))
            .push(Action.new(parseTree: `{ n }))
        );

unsign = 
    Sequence.new()
        .push(Begin.new())
        .push(Plus.new(expression: RuleCall.new(name: #digit)))
        .push(End.new())
        .push(RuleCall.new(name: #ws))
        .push(Action.new(parseTree: `{ yytext.asInteger(10); }));

metaVar =
    Sequence.new()
        .push(Assignment.new(name: #i, rule: RuleCall.new(name: #metaId)))
        .push(Action.new(parseTree: `{ GetVar.new(name: i); }));

metaId  = 
    Sequence.new()
        .push(Begin.new())
        .push(RuleCall.new(name: #letter))
        .push(Star.new(expression: RuleCall.new(name: #alnum)))
        .push(End.new())
        .push(RuleCall.new(name: #ws))
        .push(Action.new(parseTree: `{ intern(yytext); }));

digit  = CharacterClass.new(value: "0-9");
letter = CharacterClass.new(value: "A-Za-z_");
alnum = 
    Alternation.new()
        .push(RuleCall.new(name: #letter))
        .push(RuleCall.new(name: #digit));
nil = 
    Sequence.new()
        .push(StringLiteral.new(string: "nil"))
        .push(Not.new(expression: RuleCall.new(name: #alnum)))
        .push(RuleCall.new(name: #ws));

semi   = Sequence.new().push(StringLiteral.new(string: ";" )).push(RuleCall.new(name: #ws));
comma  = Sequence.new().push(StringLiteral.new(string: "," )).push(RuleCall.new(name: #ws));
lparen = Sequence.new().push(StringLiteral.new(string: "(" )).push(RuleCall.new(name: #ws));
rparen = Sequence.new().push(StringLiteral.new(string: ")" )).push(RuleCall.new(name: #ws));
lbrak  = Sequence.new().push(StringLiteral.new(string: "[" )).push(RuleCall.new(name: #ws));
rbrak  = Sequence.new().push(StringLiteral.new(string: "]" )).push(RuleCall.new(name: #ws));
lbrace = Sequence.new().push(StringLiteral.new(string: "{" )).push(RuleCall.new(name: #ws));
rbrace = Sequence.new().push(StringLiteral.new(string: "}" )).push(RuleCall.new(name: #ws));

assign =
    Sequence.new()
        .push(StringLiteral.new(string: "="))
        .push(Not.new(expression: CharacterClass.new(value: "=")))
        .push(RuleCall.new(name: #ws));
dot    =
    Sequence.new()
        .push(StringLiteral.new(string: "."))
        .push(Not.new(expression: CharacterClass.new(value: ".")))
        .push(RuleCall.new(name: #ws));
colon  =
    Sequence.new()
        .push(StringLiteral.new(string: ":"))
        .push(Not.new(expression: CharacterClass.new(value: ":")))
        .push(RuleCall.new(name: #ws));

end_of_file = Not.new(expression: Dot.new());

end_of_line =
    Alternation.new()
        .push(StringLiteral.new(string: "\r\n"))
        .push(StringLiteral.new(string: "\n"))
        .push(StringLiteral.new(string: "\r"));

comment =
    Sequence.new()
        .push(StringLiteral.new(string: "//"))
        .push(Star.new(expression: 
            Sequence.new()
                .push(Not.new(expression: RuleCall.new(name: #end_of_line)))
                .push(Dot.new())
        ))
        .push(RuleCall.new(name: #end_of_line));

space =
    Alternation.new()
        .push(StringLiteral.new(string: " "))
        .push(StringLiteral.new(string: "\t"))
        .push(RuleCall.new(name: #end_of_line));

ws = 
    Star.new(expression: Alternation.new()
        .push(RuleCall.new(name: #space))
        .push(RuleCall.new(name: #comment))
    );

// ----- Grammar of Grammars -----

with(#HardCodedPeg);

grammar =
    Sequence.new()
        .push(RuleCall.new(name: #ws))
        .push(Plus.new(expression: Sequence.new()
            .push(Assignment.new(name: #d, rule: RuleCall.new(name: #definition)))
            .push(Action.new(parseTree: `{ __namespaces__.last()[d.name] = d.expression; }))
        ))
        .push(RuleCall.new(name: #end_of_file));

definition =
    Sequence.new()
        .push(Assignment.new(name: #i, rule: RuleCall.new(name: #identifier)))
        .push(RuleCall.new(name: #assign))
        .push(Assignment.new(name: #e, rule: RuleCall.new(name: #expression)))
        .push(Optional.new(expression: RuleCall.new(name: #semi)))
        .push(Action.new(parseTree: `{ Definition.new(name: i, expression: e); }));

expression =
    Alternation.new()
        .push(Sequence.new()
            .push(Assignment.new(name: #s, rule: RuleCall.new(name: #sequence)))
            .push(Not.new(expression: RuleCall.new(name: #bar)))
            .push(Action.new(parseTree: `{ s; }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #s1, rule: RuleCall.new(name: #sequence)))
            .push(Action.new(parseTree: `{ s1 = Alternation.new().push(s1); }))
            .push(Star.new(expression: Sequence.new()
                .push(RuleCall.new(name: #bar))
                .push(Assignment.new(name: #s2, rule: RuleCall.new(name: #sequence)))
                .push(Action.new(parseTree: `{ s1.push(s2); }))
            ))
            .push(Action.new(parseTree: `{ s1; }))
        );

sequence =
    Sequence.new()
        .push(Assignment.new(name: #p, rule: RuleCall.new(name: #prefix)))
        .push(Action.new(parseTree: `{ p = Sequence.new().push(p); }))
        .push(Star.new(expression: Sequence.new()
            .push(Assignment.new(name: #q, rule: RuleCall.new(name: #prefix)))
            .push(Action.new(parseTree: `{ p.push(q); }))
        ))
        .push(Action.new(parseTree: `{ p; }));

prefix =
    Alternation.new()
        .push(Sequence.new()
            .push(RuleCall.new(name: #and))
            .push(RuleCall.new(name: #action))
        )
        .push(Alternation.new()
            .push(Sequence.new()
                .push(RuleCall.new(name: #and))
                .push(Assignment.new(name: #s, rule: RuleCall.new(name: #suffix)))
                .push(Action.new(parseTree: `{ And.new(expression: s); }))
            )
            .push(Sequence.new()
                .push(RuleCall.new(name: #not))
                .push(Assignment.new(name: #s, rule: RuleCall.new(name: #suffix)))
                .push(Action.new(parseTree: `{ Not.new(expression: s); }))
            )
            .push(Sequence.new()
                .push(Assignment.new(name: #s, rule: RuleCall.new(name: #suffix)))
                .push(Action.new(parseTree: `{ s; }))
            )
        );

suffix =
    Sequence.new()
        .push(Assignment.new(name: #p, rule: RuleCall.new(name: #primary)))
        .push(Optional.new(expression: Alternation.new()
            .push(Sequence.new()
                .push(RuleCall.new(name: #query))
                .push(Action.new(parseTree: `{ p = Optional.new(expression: p); }))
            )
            .push(Sequence.new()
                .push(RuleCall.new(name: #star))
                .push(Action.new(parseTree: `{ p = Star.new(expression: p); }))
            )
            .push(Sequence.new()
                .push(RuleCall.new(name: #plus))
                .push(Action.new(parseTree: `{ p = Plus.new(expression: p); }))
            )
        ))
        .push(Action.new(parseTree: `{ p; }));

primary =
    Alternation.new()
        .push(Sequence.new()
            .push(Assignment.new(name: #i1, rule: RuleCall.new(name: #identifier)))
            .push(RuleCall.new(name: #colon))
            .push(Assignment.new(name: #i2, rule: RuleCall.new(name: #ruleCall)))
            .push(Not.new(expression: RuleCall.new(name: #assign)))
            .push(Action.new(parseTree: `{ Assignment.new(name: i1, rule: i2); }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #i, rule: RuleCall.new(name: #ruleCall)))
            .push(Not.new(expression: RuleCall.new(name: #assign)))
            .push(Action.new(parseTree: `{ i; }))
        )
        .push(Sequence.new()
            .push(RuleCall.new(name: #lparen))
            .push(Assignment.new(name: #e, rule: RuleCall.new(name: #expression)))
            .push(RuleCall.new(name: #rparen))
            .push(Action.new(parseTree: `{ e; }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #l, rule: RuleCall.new(name: #literal)))
            .push(Action.new(parseTree: `{ l; }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #c, rule: RuleCall.new(name: #class)))
            .push(Action.new(parseTree: `{ c; }))
        )
        .push(Sequence.new()
            .push(RuleCall.new(name: #dot))
            .push(Action.new(parseTree: `{ Dot.new(); }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #a, rule: RuleCall.new(name: #action)))
            .push(Action.new(parseTree: `{ a; }))
        )
        .push(Sequence.new()
            .push(RuleCall.new(name: #begin))
            .push(Action.new(parseTree: `{ Begin.new(); }))
        )
        .push(Sequence.new()
            .push(RuleCall.new(name: #end))
            .push(Action.new(parseTree: `{ End.new(); }))
        );

identifier    =
    Sequence.new()
        .push(Begin.new())
        .push(CharacterClass.new(value: "-a-zA-Z_"))
        .push(Star.new(expression: CharacterClass.new(value: "-a-zA-Z_0-9")))
        .push(End.new())
        .push(RuleCall.new(name: #ws))
        .push(Action.new(parseTree: `{ intern(yytext); }));

ruleCall =
    Alternation.new()
        .push(Sequence.new()
            .push(Assignment.new(name: #n, rule: RuleCall.new(name: #identifier)))
            .push(RuleCall.new(name: #ccolon))
            .push(Assignment.new(name: #r, rule: RuleCall.new(name: #identifier)))
            .push(Action.new(parseTree: `{ NamespacedRuleCall.new(namespace: n, name: r); }))
        )
        .push(Sequence.new()
            .push(Assignment.new(name: #i, rule: RuleCall.new(name: #identifier)))
            .push(Action.new(parseTree: `{ RuleCall.new(name: i); }))
        );

literal =
    Alternation.new()
        .push(Sequence.new()
            .push(CharacterClass.new(value: "\'"))
            .push(Begin.new())
            .push(Star.new(expression: Sequence.new()
                .push(Not.new(expression: CharacterClass.new(value: "\'")))
                .push(RuleCall.new(name: #char))
            ))
            .push(End.new())
            .push(CharacterClass.new(value: "\'"))
            .push(RuleCall.new(name: #ws))
            .push(Action.new(parseTree: `{ StringLiteral.new(string: yytext); }))
        )
        .push(Sequence.new()
            .push(CharacterClass.new(value: "\""))
            .push(Begin.new())
            .push(Star.new(expression: Sequence.new()
                .push(Not.new(expression: CharacterClass.new(value: "\"")))
                .push(RuleCall.new(name: #char))
            ))
            .push(End.new())
            .push(CharacterClass.new(value: "\""))
            .push(RuleCall.new(name: #ws))
            .push(Action.new(parseTree: `{ StringLiteral.new(string: yytext); }))
        );

class =
    Sequence.new()
        .push(StringLiteral.new(string: "["))
        .push(Begin.new())
        .push(Star.new(expression: Sequence.new()
            .push(Not.new(expression: StringLiteral.new(string: "]")))
            .push(RuleCall.new(name: #range))
        ))
        .push(End.new())
        .push(StringLiteral.new(string: "]"))
        .push(RuleCall.new(name: #ws))
        .push(Action.new(parseTree: `{ CharacterClass.new(value: yytext); }));

range =
    Alternation.new()
        .push(Sequence.new()
            .push(RuleCall.new(name: #char))
            .push(StringLiteral.new(string: "-"))
            .push(RuleCall.new(name: #char))
        )
        .push(
            RuleCall.new(name: #char)
        );

char =
    Alternation.new()
        .push(Sequence.new()
            .push(StringLiteral.new(string: "\\"))
            .push(CharacterClass.new(value: "abefnrtv\'\"[]\\"))
        )
        .push(Sequence.new()
            .push(StringLiteral.new(string: "\\"))
            .push(CharacterClass.new(value: "0-3"))
            .push(CharacterClass.new(value: "0-7"))
            .push(CharacterClass.new(value: "0-7"))
        )
        .push(Sequence.new()
            .push(StringLiteral.new(string: "\\"))
            .push(CharacterClass.new(value: "0-7"))
            .push(Optional.new(expression: CharacterClass.new(value: "0-7")))
        )
        .push(Sequence.new()
            .push(Not.new(expression: StringLiteral.new(string: "\\")))
            .push(Dot.new())
        );

action =
    Sequence.new()
        .push(Assignment.new(name: #m, rule: NamespacedRuleCall.new(namespace: #HardCodedMeta, name: #block)))
        .push(RuleCall.new(name: #ws))
        .push(Action.new(parseTree: `{ Action.new(parseTree: m); }));

bar      = Sequence.new().push(StringLiteral.new(string: "|")).push(RuleCall.new(name: #ws));
not      = Sequence.new().push(StringLiteral.new(string: "!")).push(RuleCall.new(name: #ws));
query    = Sequence.new().push(StringLiteral.new(string: "?")).push(RuleCall.new(name: #ws));
begin    = Sequence.new().push(StringLiteral.new(string: "<")).push(RuleCall.new(name: #ws));
end      = Sequence.new().push(StringLiteral.new(string: ">")).push(RuleCall.new(name: #ws));
tilde    = Sequence.new().push(StringLiteral.new(string: "~")).push(RuleCall.new(name: #ws));
rpercent = Sequence.new().push(StringLiteral.new(string: "%}")).push(RuleCall.new(name: #ws));

ccolon = Sequence.new().push(StringLiteral.new(string: "::")).push(RuleCall.new(name: #ws));

and    =
    Sequence.new()
        .push(StringLiteral.new(string: "&"))
        .push(Not.new(expression: CharacterClass.new(value: "&=")))
        .push(RuleCall.new(name: #ws));
plus   =
    Sequence.new()
        .push(StringLiteral.new(string: "+"))
        .push(Not.new(expression: CharacterClass.new(value: "+=")))
        .push(RuleCall.new(name: #ws));
star   =
    Sequence.new()
        .push(StringLiteral.new(string: "*"))
        .push(Not.new(expression: CharacterClass.new(value: "=")))
        .push(RuleCall.new(name: #ws));

end_of_file = Not.new(expression: Dot.new());

end_of_line =
    Alternation.new()
        .push(StringLiteral.new(string: "\r\n"))
        .push(StringLiteral.new(string: "\n"))
        .push(StringLiteral.new(string: "\r"));

comment =
    Sequence.new()
        .push(StringLiteral.new(string: "#"))
        .push(Star.new(expression: 
            Sequence.new()
                .push(Not.new(expression: RuleCall.new(name: #end_of_line)))
                .push(Dot.new())
        ))
        .push(RuleCall.new(name: #end_of_line));

space =
    Alternation.new()
        .push(StringLiteral.new(string: " "))
        .push(StringLiteral.new(string: "\t"))
        .push(RuleCall.new(name: #end_of_line));

ws = 
    Star.new(expression: Alternation.new()
        .push(RuleCall.new(name: #space))
        .push(RuleCall.new(name: #comment))
    );

// ----- Main -----

without(all: 1);

HardCodedPeg  = Grammar.new();
HardCodedMeta = Grammar.new();

HardCodedPeg.addRulesFromNamespace(#HardCodedPeg);
HardCodedMeta.addRulesFromNamespace(#HardCodedMeta);

HardCodedPeg.__delegate__ = HardCodedMeta;

global stream = newStream(readfile("rawminproto.leg"));
global context = Context.new(outerContext: nil).init();
global actions = [];

print("Matching rawminproto.leg : ", HardCodedPeg.grammar(stream, context, actions), "\n");

with(#metaLanguage);
for (actionAndContext in actions) {
    actionAndContext.action.execute(actionAndContext.context);
}
without(#metaLanguage);
println("\n--------- META ---------\n\n");
println(__namespaces__.metaLanguage);

global stream = newStream(readfile("rawgrammar.leg"));
global context = Context.new(outerContext: nil).init();
global actions = [];

print("Matching rawgrammar.leg : ", HardCodedPeg.grammar(stream, context, actions), "\n");

// Execute all actions after all matching

with(#peg);

for (actionAndContext in actions) {
    actionAndContext.action.execute(actionAndContext.context);
}

without(#peg);
println("\n--------- PEG ---------\n\n");
println(__namespaces__.peg);

// Circularity test

peg = Grammar.new();
metaLanguage  = Grammar.new();

peg.addRulesFromNamespace(#peg);
metaLanguage.addRulesFromNamespace(#metaLanguage);

peg.__delegate__ = metaLanguage;

global stream2 = newStream(readfile("rawminproto.leg"));
global context2 = Context.new(outerContext: nil).init();
global actions2 = [];

print("\nMatching : ", peg.grammar(stream2, context2, actions2), "\n");

with(#metaLanguageCircular);

for (actionAndContext in actions2) {
    actionAndContext.action.execute(actionAndContext.context);
}

without(#metaLanguageCircular);
println("\n--------- CIRCULAR META ---------\n\n");
println(__namespaces__.metaLanguageCircular);

global stream2 = newStream(readfile("rawgrammar.leg"));
global context2 = Context.new(outerContext: nil).init();
global actions2 = [];

print("\nMatching : ", peg.grammar(stream2, context2, actions2), "\n");

with(#pegCircular);

for (actionAndContext in actions2) {
    actionAndContext.action.execute(actionAndContext.context);
}

without(#pegCircular);
println("\n--------- CIRCULAR PEG ---------\n\n");
println(__namespaces__.pegCircular);

compareGrammars(grammar1, grammar2) {
    local success = 1;
    for (key in __namespaces__[grammar1].keys()) {
        if (key == #__nsname__) continue;

        if (codeString(__namespaces__[grammar1][key]) != codeString(__namespaces__[grammar2][key])) {
            print("Found different objects for rule ", key, ":\n");
            println(__namespaces__[grammar1][key]);
            println(__namespaces__[grammar2][key]);
            success = 0;
        }
    }
    if (success == 1) {
        print("Grammars ", grammar1, " and ", grammar2, " are equal\n");
    }
}

compareGrammars(#peg, #pegCircular);
compareGrammars(#metaLanguage, #metaLanguageCircular);