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C++ Lexer::advance方法代码示例

本文整理汇总了C++中Lexer::advance方法的典型用法代码示例。如果您正苦于以下问题：C++ Lexer::advance方法的具体用法？C++ Lexer::advance怎么用？C++ Lexer::advance使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Lexer的用法示例。


在下文中一共展示了Lexer::advance方法的15个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: parseTermPrefix

ExpPtr parseTermPrefix (Lexer& lex)
{
	Token tok = lex.current();

	switch (tok.tok)
	{
	case tNumberInt:
		tok = lex.advance();
		return Exp::make(eInt, tok.valueInt, {}, tok.span);

	case tNumberReal:
		tok = lex.advance();
		return Exp::make(eReal, tok.valueReal, {}, tok.span);

	case tString:
		tok = lex.advance();
		return Exp::make(eString, tok.str, {}, tok.span);

	case tTrue:
	case tFalse:
		tok = lex.advance();
		return Exp::make(eBool, tok == tTrue, {}, tok.span);

	case tIdent:
		tok = lex.advance();
		return Exp::make(eVar, tok.str, bool(true), {}, tok.span);

	case tLParen:
		return parseTuple(lex);
	case tIf:
		return parseCond(lex);
	case tLCurl:
		return parseBlock(lex);
	case tLBrack:
		return parseList(lex);

	case tFunc: case tLambda:
		return parseLambda(lex);

	case tiMake:  return parseiMake(lex);
	case tiGet:   return parseiGet(lex);
	case tiPut:   return parseiPut(lex);
	case tiCall:  return parseiCall(lex);

	default:
		//lex.expect("term");
		lex.unexpect();
		return nullptr;
	}
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:50，代码来源:Parser.cpp

示例2: parseCond

ExpPtr parseCond (Lexer& lex)
{
	Span spStart, spEnd;
	ExpPtr expCond, expThen, expElse;
	bool blockRequired = true;

	spStart = lex.eat(tIf).span;

	expCond = parseExp(lex);

	if (lex.current() == tThen)
	{
		lex.advance();
		blockRequired = false;
	}

	expThen = blockRequired ? 
				parseBlock(lex) :
				parseExp(lex);

	if (lex.current() == tElse)
	{
		lex.advance();
		if (blockRequired)
		{
			// if {} else {}
			// if {} else if ...
			
			if (lex.current() != tIf)
				lex.expect(tLCurl);
			expElse = parseExp(lex);
		}
		else
			expElse = parseExp(lex);

		spEnd = expElse->span;
	}
	else if (!blockRequired)
		lex.expect(tElse);
	else
	{
		auto expUnit = Exp::make(eTuple, {}, spStart);
		expThen->subexps.push_back(expUnit);
		expElse = expUnit; // no else => unit (zero tuple)
		spEnd = expThen->span;
	}

	return Exp::make(eCond, { expCond, expThen, expElse }, spStart + spEnd);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:49，代码来源:Parser.cpp

示例3: parseFor

ExpPtr parseFor (Lexer& lex)
{
	Span spStart, spEnd;
	ExpPtr val1, val2, body;

	spStart = lex.eat(tFor).span;

	auto var = lex.eat(tIdent).str;
	lex.eat(tColon);

	val1 = parseExp(lex);
	if (lex.current() == tArrow)
	{
		lex.advance();
		val2 = parseExp(lex);
	}
	else
		val2 = nullptr;

	body = parseBlock(lex);
	spEnd = body->span;

	if (val2 == nullptr)
		return Exp::make(eForEach, var,
				{ val1, body }, spStart + spEnd);
	else
		return Exp::make(eForRange, var,
				{ val1, val2, body }, spStart + spEnd);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:29，代码来源:Parser.cpp

示例4: parseBlockExp

void parseBlockExp (Lexer& lex, ExpList& list)
{
	switch (lex.current().tok)
	{
	case tSemicolon:
		lex.advance();
		break;
	case tLet:
		list.push_back(parseLet(lex));
		lex.eat(tSemicolon);
		break;
	case tLCurl:
		list.push_back(parseBlock(lex));
		break;
	case tIf:
		list.push_back(parseCond(lex));
		break;
	case tLoop:
		list.push_back(parseLoop(lex));
		break;
	case tFor:
		list.push_back(parseFor(lex));
		break;

	// everthing else does
	default:
		list.push_back(parseAssign(lex, parseExp(lex)));
		if (lex.current() != tSemicolon)
			lex.expect(tRCurl);
		else
			lex.eat(tSemicolon);
		break;
	}
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:34，代码来源:Parser.cpp

示例5: parseLambda

ExpPtr parseLambda (Lexer& lex)
{
	Span spStart, spEnd;
	SigPtr sig;
	ExpPtr body;

	spStart = lex.current().span;

	if (lex.current() == tFunc)
	{
		lex.advance();
		sig = parseSigParens(lex);
		body = parseBlock(lex);
	}
	else
	{
		lex.eat(tLambda);
		sig = parseSig(lex, true);
		lex.eat(tArrow);
		body = parseExp(lex);
	}
	spEnd = body->span;

	return Exp::make(eLambda, sig->toSigType(), "", { body }, spStart + spEnd);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:25，代码来源:Parser.cpp

示例6: parseVar

void parseVar (Lexer& lex, std::string& name, TyPtr& ty, Span& sp)
{
	sp = lex.current().span;
	name = lex.eat(tIdent).str;

	if (lex.current() == tColon)
	{
		Span spEnd;

		lex.advance();
		ty = parseType(lex, spEnd);

		sp = sp + spEnd;
	}
	else
		ty = Ty::makeWildcard();
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:17，代码来源:Parser.cpp

示例7: parseTypeDecl

TypeDecl parseTypeDecl (Lexer& lex)
{
	Span spStart, spEnd, spType;
	std::vector<FuncDecl> ctors;

	spStart = lex.eat(tType).span;

	auto ty = parseType(lex, spType);

	if (ty->kind != tyConcrete)
		throw spType.die("invalid form of type in declaration");

	for (auto sub = ty->subtypes; !sub.nil(); ++sub)
	{
		auto sty = sub.head();

		if (sty->kind != tyPoly)
			throw spType.die("arguments to type must be polytypes");

		for (auto sty2 : sub.tail())
			if (sty2->kind == tyPoly &&
					sty->name == sty2->name)
				throw spType.die("identical polytypes in declaration");
	}

	lex.eat(tEqual);
	for (;;)
	{
		auto ctor = parseConstructor(lex);
		spEnd = ctor.span;
		ctors.push_back(ctor);

		if (lex.current() == tComma)
			lex.advance();
		else
			break;
	}

	return TypeDecl
		{
			ty->name,
			ty->subtypes,
			std::move(ctors),
			spStart + spEnd
		};
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:46，代码来源:Parser.cpp

示例8: esNif

bool Importar::esNif(const std::string &lin, Lexer &lex)
{
    bool toret = false;
    unsigned int pos = lex.getCurrentPos();

    if ( std::isalpha( lex.getCurrentChar() ) ) {
        lex.advance();

        if ( Lexer::StandardDelimiters.find( lex.getCurrentChar() ) != std::string::npos
          || this->esSeparador( lex.getCurrentChar() ) )
        {
            toret = true;
        }
    }

    lex.reset( pos );
    return toret;
}
开发者ID:Baltasarq，项目名称:Califa，代码行数:18，代码来源:importar.cpp

示例9: parseTypeTupleRaw

static void parseTypeTupleRaw (Lexer& lex, std::vector<TyPtr>& out, Span& sp)
{
	Span spStart, spEnd;

	spStart = lex.eat(tLParen).span;
	while (lex.current() != tRParen)
	{
		out.push_back(parseType(lex, spEnd));

		if (lex.current() == tComma)
			lex.advance();
		else
			break;
	}
	spEnd = lex.eat(tRParen).span;

	sp = spStart + spEnd;
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:18，代码来源:Parser.cpp

示例10: parseList

ExpPtr parseList (Lexer& lex)
{
	Span spStart, spEnd;
	ExpList vals;

	spStart = lex.eat(tLBrack).span;
	while (lex.current() != tRBrack)
	{
		vals.push_back(parseExp(lex));

		if (lex.current() == tComma)
			lex.advance();
		else
			break;
	}
	spEnd = lex.eat(tRBrack).span;

	return Exp::make(eList, std::move(vals), spStart + spEnd);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:19，代码来源:Parser.cpp

示例11: parseTypeTuple

TyPtr parseTypeTuple (Lexer& lex, Span& sp)
{
	Span spStart, spEnd;

	std::vector<TyPtr> inners;
	parseTypeTupleRaw(lex, inners, spStart);

	if (lex.current() == tArrow)
	{
		lex.advance();
		inners.push_back(parseType(lex, spEnd));

		sp = spStart + spEnd;
		return Ty::makeFn(inners);
	}

	sp = spStart;

	if (inners.size() == 1)
		return inners[0];

	return Ty::makeConcrete("Tuple", inners);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:23，代码来源:Parser.cpp

示例12: parseType

TyPtr parseType (Lexer& lex, Span& sp)
{
	switch (lex.current().tok)
	{
	case tLambda:
		return parseTypePoly(lex, sp);
	case tLBrack:
		return parseTypeList(lex, sp);
	case tLParen:
		return parseTypeTuple(lex, sp);
	case tIdent:
		return parseTypeConcrete(lex, sp);

	case tWildcard:
		sp = lex.current().span;
		lex.advance();
		return Ty::makeWildcard();

	default:
		lex.expect("type");
		return nullptr;
	}
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:23，代码来源:Parser.cpp

示例13: parseTuple

ExpPtr parseTuple (Lexer& lex)
{
	ExpList exps;
	ExpPtr e;
	Span spStart, spEnd;

	spStart = lex.eat(tLParen).span;

	while (lex.current() != tRParen)
	{
		e = parseExp(lex);
		exps.push_back(e);

		if (lex.current() == tComma)
			lex.advance();
		else
			break;
	}
	
	spEnd = lex.eat(tRParen).span;

	return Exp::make(eTuple, exps, spStart + spEnd);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:23，代码来源:Parser.cpp

示例14: parseSig

SigPtr parseSig (Lexer& lex, bool anything)
{
	auto res = std::make_shared<Sig>();
	
	// sig := (<var> (',' <var>)*)?

	for (;; anything = true)
	{
		if (anything)
			lex.expect(tIdent);
		else if (lex.current() != tIdent)
			break;

		parseVar(lex, res);

		if (lex.current() == tComma)
			lex.advance();
		else
			break;
	}

	return res;
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:23，代码来源:Parser.cpp

示例15: parseExp

ExpPtr parseExp (Lexer& lex)
{
	Span spStart, spEnd;
	ExpList vals;
	ExpPtr e;
	Token tok;

	e = parseTerm(lex);
	vals.push_back(e);
	spStart = spEnd = e->span;

	while (lex.current() == tIdent)
		if (lex.current().isOperator())
		{
			// <op>
			tok = lex.advance();
			e = Exp::make(eVar, tok.str, bool(true), {}, tok.span);
			vals.push_back(e);

			// <term>
			e = parseTerm(lex);
			vals.push_back(e);

			spEnd = e->span;
		}
		else
			lex.expect("operator");

	if (vals.size() == 1)
		return vals[0];
//	else if (vals.size() == 3)
//		return Exp::make(eCall, { vals[1], vals[0], vals[2] },
//							spStart + spEnd);
	else
		return Exp::make(eInfix, vals, spStart + spEnd);
}
开发者ID:iitalics，项目名称:Jupiter，代码行数:36，代码来源:Parser.cpp


注：本文中的Lexer::advance方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台，相关代码片段筛选自各路编程大神贡献的开源项目，源码版权归原作者所有，传播和使用请参考对应项目的License；未经允许，请勿转载。