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; } }
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); }
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); }
ImportDecl parseImportDecl (Lexer& lex) { Span spStart, spEnd; spStart = lex.eat(tImport).span; auto nameTok = lex.eat(tIdent, tString); auto name = nameTok.str; spEnd = nameTok.span; return ImportDecl { .isPublic = false, .name = name, .span = spStart + spEnd }; } FuncDecl parseFuncDecl (Lexer& lex) { Span spStart, spEnd; spStart = lex.eat(tFunc).span; auto name = lex.eat(tIdent).str; auto sig = parseSigParens(lex); ExpPtr body; /* if (lex.current() == tEqual) { lex.advance(); body = parseExp(lex); } else */ body = parseBlock(lex); spEnd = sig->span; return FuncDecl { .isPublic = false, .name = name, .signature = sig, .body = body, .span = spStart + spEnd }; } static FuncDecl parseConstructor (Lexer& lex) { Span spStart, spEnd; FuncDecl result; result.name = lex.current().str; spStart = lex.eat(tIdent).span; result.signature = parseSigParens(lex); spEnd = result.signature->span; result.span = spStart + spEnd; result.body = nullptr; return result; }
ExpPtr parseMem (Lexer& lex, ExpPtr in) { lex.eat(tDot); auto mem = lex.eat(tIdent); return Exp::make(eMem, mem.str, { in }, in->span + mem.span); }
TyPtr parseTypePoly (Lexer& lex, Span& sp) { Span spStart, spEnd; spStart = lex.eat(tLambda).span; spEnd = lex.current().span; auto name = lex.eat(tIdent).str; sp = spStart + spEnd; return Ty::makePoly(name); }
TyPtr parseTypeList (Lexer& lex, Span& sp) { Span spStart, spEnd; spStart = lex.eat(tLBrack).span; auto inner = parseType(lex, spEnd); spEnd = lex.eat(tRBrack).span; sp = spStart + spEnd; return Ty::makeConcrete("List", { inner }); }
SigPtr parseSigParens (Lexer& lex) { Span spStart, spEnd; spStart = lex.eat(tLParen).span; auto res = parseSig(lex, false); spEnd = lex.eat(tRParen).span; res->span = spStart + spEnd; return res; }
ExpPtr parseBlock (Lexer& lex) { Span spStart, spEnd; ExpList exps; spStart = lex.eat(tLCurl).span; while (lex.current() != tRCurl) parseBlockExp(lex, exps); spEnd = lex.eat(tRCurl).span; return Exp::make(eBlock, exps, spStart + spEnd); }
ExpPtr parseiGet (Lexer& lex) { // ^get <ty> <idx> <term> Span spStart, spEnd, spType; spStart = lex.eat(tiGet).span; auto ty = parseType(lex, spType); auto idx = lex.eat(tNumberInt).valueInt; auto body = parseTerm(lex); spEnd = body->span; auto e = Exp::make(eiGet, idx, { body }, spStart + spEnd); e->setType(ty); return e; }
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 }; }
ExpPtr parseiCall (Lexer& lex) { // ^call <ty> <name> Span spStart, spEnd, spType; spStart = lex.eat(tiCall).span; auto ty = parseType(lex, spType); spEnd = lex.current().span; auto tag = lex.eat(tString).str; if (ty->kind != tyConcrete || ty->name != "Fn") throw spType.die("^call expects function type"); auto e = Exp::make(eiCall, tag, {}, spStart + spEnd); e->setType(ty); return e; }
ExpPtr parseLet (Lexer& lex) { Span spStart, spEnd; std::string name; TyPtr ty; ExpPtr init; // 'let' <var> '=' <exp> ';' spStart = lex.eat(tLet).span; parseVar(lex, name, ty, spEnd); lex.eat(tEqual); init = parseExp(lex); spEnd = init->span; auto e = Exp::make(eLet, ty, name, { init }, spStart + spEnd); return e; }
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; }
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); }
ExpPtr parseAssign (Lexer& lex, ExpPtr left) { if (lex.current() != tEqual) return left; lex.eat(tEqual); auto right = parseExp(lex); lex.expect(tSemicolon); return Exp::make(eAssign, { left, right }, left->span + right->span); }
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); }
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); }
TyPtr parseTypeConcrete (Lexer& lex, Span& sp) { Span spStart, spEnd; std::vector<TyPtr> sub; spStart = lex.current().span; auto kind = lex.eat(tIdent).str; if (lex.current() == tLParen) parseTypeTupleRaw(lex, sub, spEnd); sp = spStart + spEnd; return Ty::makeConcrete(kind, sub); }
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(); }
void parsePublic (Lexer& lex, GlobProto& proto) { Span span = lex.eat(tPub).span; if (lex.current() == tFunc) { auto fn = parseFuncDecl(lex); fn.isPublic = true; fn.span = span + fn.span; proto.funcs.push_back(fn); } else if (lex.current() == tImport) { auto imp = parseImportDecl(lex); imp.isPublic = true; imp.span = span + imp.span; proto.imports.push_back(imp); } else lex.unexpect(); }
ExpPtr parseLoop (Lexer& lex) { Span spStart, spEnd; ExpPtr body; spStart = lex.eat(tLoop).span; ExpList sub; sub.reserve(2); if (lex.current() == tLCurl) { sub.push_back(body = parseBlock(lex)); } else { sub.push_back(parseExp(lex)); sub.push_back(body = parseBlock(lex)); } spEnd = body->span; return Exp::make(eLoop, std::move(sub), spStart + spEnd); }