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Allow separators to be omitted from lists. #22714

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Allow separators to be omitted from lists. #22714

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83ede8b
WIP: Allow separators to be omitted from lists.
nate-chandler Feb 19, 2019
0222aaa
Basic test coverage.
nate-chandler Feb 20, 2019
5b7c04b
Allowed omission from function calls and tuples.
nate-chandler Mar 11, 2019
57ea012
Added tests on initializers.
nate-chandler Mar 11, 2019
dd5a874
Corrected argument capitalization.
nate-chandler Mar 11, 2019
ab31290
Add tests for indentation, swift-syntax for optional commas
benlangmuir Mar 19, 2019
0d0d843
Add code-completion tests for optional commas
benlangmuir Mar 22, 2019
917d989
Corrected expected error messages in Parse/invalid.swift.
nate-chandler Mar 25, 2019
5cf817d
Stmts/decls can start line if separators omitted.
nate-chandler Mar 29, 2019
39d6296
Updated tests with revised diagnostics.
nate-chandler Apr 1, 2019
1fdfe90
Bail out of expr sequence parsing if peek shows :.
nate-chandler Apr 1, 2019
6b393ae
Updated new parseExprList call.
nate-chandler Apr 1, 2019
da4873b
Fix test after change to contextual type
benlangmuir Apr 1, 2019
acdd16f
Parsed keywords as argument labels correctly, fixing diagnostic regre…
nate-chandler Apr 5, 2019
faecb8d
Lookahead in parseList, not isStartOf{Decl,Stmt}.
nate-chandler Apr 5, 2019
4b8c2f9
Unified two separate conditional blocks into one.
nate-chandler Apr 5, 2019
2adc41d
Fixed whitespace.
nate-chandler Apr 8, 2019
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8 changes: 5 additions & 3 deletions include/swift/Parse/Parser.h
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Original file line number Diff line number Diff line change
Expand Up @@ -780,8 +780,8 @@ class Parser {

/// Parse a comma separated list of some elements.
ParserStatus parseList(tok RightK, SourceLoc LeftLoc, SourceLoc &RightLoc,
bool AllowSepAfterLast, Diag<> ErrorDiag,
syntax::SyntaxKind Kind,
bool AllowSepAfterLast, bool AllowSepOmission,
Diag<> ErrorDiag, syntax::SyntaxKind Kind,
llvm::function_ref<ParserStatus()> callback);

void consumeTopLevelDecl(ParserPosition BeginParserPosition,
Expand Down Expand Up @@ -1377,13 +1377,15 @@ class Parser {
SourceLoc &inLoc);

Expr *parseExprAnonClosureArg();
ParserResult<Expr> parseExprList(tok LeftTok, tok RightTok,
ParserResult<Expr> parseExprList(tok LeftTok, tok RightTok,
bool AllowSepOmission,
syntax::SyntaxKind Kind);

/// Parse an expression list, keeping all of the pieces separated.
ParserStatus parseExprList(tok leftTok, tok rightTok,
bool isPostfix,
bool isExprBasic,
bool allowSepOmission,
SourceLoc &leftLoc,
SmallVectorImpl<Expr *> &exprs,
SmallVectorImpl<Identifier> &exprLabels,
Expand Down
3 changes: 3 additions & 0 deletions lib/Parse/ParseDecl.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1894,6 +1894,7 @@ bool Parser::parseDeclAttribute(DeclAttributes &Attributes, SourceLoc AtLoc) {
ParserStatus status = parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/false,
/*isExprBasic=*/true,
/*allowSepOmission=*/false,
lParenLoc, args, argLabels,
argLabelLocs,
rParenLoc,
Expand Down Expand Up @@ -2588,6 +2589,8 @@ bool Parser::isStartOfDecl() {
// If this is obviously not the start of a decl, then we're done.
if (!isKeywordPossibleDeclStart(Tok)) return false;

if (peekToken().is(tok::colon)) return false;

// When 'init' appears inside another 'init', it's likely the user wants to
// invoke an initializer but forgets to prefix it with 'self.' or 'super.'
// Otherwise, expect 'init' to be the start of a declaration (and complain
Expand Down
31 changes: 24 additions & 7 deletions lib/Parse/ParseExpr.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -203,6 +203,10 @@ ParserResult<Expr> Parser::parseExprSequence(Diag<> Message,
break;

parse_operator:
if (peekToken().is(tok::colon))
// If we're about to hit a colon, we aren't parsing a binary operator, so
// we're done.
goto done;
switch (Tok.getKind()) {
case tok::oper_binary_spaced:
case tok::oper_binary_unspaced: {
Expand Down Expand Up @@ -920,6 +924,7 @@ ParserResult<Expr> Parser::parseExprSuper(bool isExprBasic) {

ParserStatus status = parseExprList(tok::l_square, tok::r_square,
/*isPostfix=*/true, isExprBasic,
/*allowSepOmission=*/true,
lSquareLoc, indexArgs, indexArgLabels,
indexArgLabelLocs,
rSquareLoc,
Expand Down Expand Up @@ -1237,9 +1242,9 @@ Parser::parseExprPostfixSuffix(ParserResult<Expr> Result, bool isExprBasic,

ParserStatus status = parseExprList(
tok::l_square, tok::r_square,
/*isPostfix=*/true, isExprBasic, lSquareLoc, indexArgs,
indexArgLabels, indexArgLabelLocs, rSquareLoc, trailingClosure,
SyntaxKind::FunctionCallArgumentList);
/*isPostfix=*/true, isExprBasic, /*allowSepOmission=*/true,
lSquareLoc, indexArgs, indexArgLabels, indexArgLabelLocs, rSquareLoc,
trailingClosure, SyntaxKind::FunctionCallArgumentList);
Result = makeParserResult(
status | Result,
SubscriptExpr::create(Context, Result.get(), lSquareLoc, indexArgs,
Expand Down Expand Up @@ -1647,6 +1652,7 @@ ParserResult<Expr> Parser::parseExprPrimary(Diag<> ID, bool isExprBasic) {

ParserStatus status = parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/true, isExprBasic,
/*allowSepOmission=*/true,
lParenLoc, args, argLabels,
argLabelLocs,
rParenLoc,
Expand Down Expand Up @@ -1701,7 +1707,7 @@ ParserResult<Expr> Parser::parseExprPrimary(Diag<> ID, bool isExprBasic) {
// differentiation. A tuple expression node in libSyntax can have a single
// element without label.
ExprContext.setCreateSyntax(SyntaxKind::TupleExpr);
return parseExprList(tok::l_paren, tok::r_paren,
return parseExprList(tok::l_paren, tok::r_paren, /*allowSepOmission=*/true,
SyntaxKind::TupleElementList);

case tok::l_square:
Expand Down Expand Up @@ -1896,6 +1902,7 @@ parseStringSegments(SmallVectorImpl<Lexer::StringSegment> &Segments,
ParserStatus S =
parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/false, /*isExprBasic=*/true,
/*allowSepOmission=*/false,
lParen, args, argLabels, argLabelLocs, rParen,
trailingClosureNeverPresent,
SyntaxKind::Unknown);
Expand Down Expand Up @@ -2976,7 +2983,8 @@ Expr *Parser::parseExprAnonClosureArg() {
/// (identifier ':')? expr
///
ParserResult<Expr>
Parser::parseExprList(tok leftTok, tok rightTok, SyntaxKind Kind) {
Parser::parseExprList(tok leftTok, tok rightTok, bool allowSepOmission,
SyntaxKind Kind) {
SmallVector<Expr*, 8> subExprs;
SmallVector<Identifier, 8> subExprNames;
SmallVector<SourceLoc, 8> subExprNameLocs;
Expand All @@ -2985,6 +2993,7 @@ Parser::parseExprList(tok leftTok, tok rightTok, SyntaxKind Kind) {
SourceLoc leftLoc, rightLoc;
ParserStatus status = parseExprList(leftTok, rightTok, /*isPostfix=*/false,
/*isExprBasic=*/true,
allowSepOmission,
leftLoc,
subExprs,
subExprNames,
Expand Down Expand Up @@ -3021,6 +3030,7 @@ Parser::parseExprList(tok leftTok, tok rightTok, SyntaxKind Kind) {
ParserStatus Parser::parseExprList(tok leftTok, tok rightTok,
bool isPostfix,
bool isExprBasic,
bool allowSepOmission,
SourceLoc &leftLoc,
SmallVectorImpl<Expr *> &exprs,
SmallVectorImpl<Identifier> &exprLabels,
Expand All @@ -3039,6 +3049,7 @@ ParserStatus Parser::parseExprList(tok leftTok, tok rightTok,
leftLoc = consumeToken(leftTok);
ParserStatus status = parseList(rightTok, leftLoc, rightLoc,
/*AllowSepAfterLast=*/false,
/*AllowSepOmission=*/allowSepOmission,
rightTok == tok::r_paren
? diag::expected_rparen_expr_list
: diag::expected_rsquare_expr_list,
Expand Down Expand Up @@ -3180,6 +3191,7 @@ Parser::parseExprObjectLiteral(ObjectLiteralExpr::LiteralKind LitKind,

ParserStatus status = parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/true, isExprBasic,
/*allowSepOmission=*/false,
lParenLoc, args, argLabels,
argLabelLocs,
rParenLoc,
Expand Down Expand Up @@ -3223,8 +3235,9 @@ ParserResult<Expr> Parser::parseExprPoundUnknown(SourceLoc LSquareLoc) {
// Parse arguments.
ParserStatus status =
parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/false, /*isExprBasic*/ false, LParenLoc,
args, argLabels, argLabelLocs, RParenLoc, trailingClosure,
/*isPostfix=*/false, /*isExprBasic*/ false,
/*allowSepOmission=*/false, LParenLoc, args, argLabels,
argLabelLocs, RParenLoc, trailingClosure,
SyntaxKind::FunctionCallArgumentList);
if (status.hasCodeCompletion())
return makeParserCodeCompletionResult<Expr>();
Expand Down Expand Up @@ -3337,6 +3350,7 @@ Parser::parseExprCallSuffix(ParserResult<Expr> fn, bool isExprBasic) {

ParserStatus status = parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/true, isExprBasic,
/*allowSepOmission=*/true,
lParenLoc, args, argLabels,
argLabelLocs,
rParenLoc,
Expand Down Expand Up @@ -3451,6 +3465,9 @@ ParserResult<Expr> Parser::parseExprCollection() {
isStartOfDecl() || isStartOfStmt()))
break;

if (Tok.isAtStartOfLine())
continue;

diagnose(Tok, diag::expected_separator, ",")
.fixItInsertAfter(PreviousLoc, ",");
Status.setIsParseError();
Expand Down
3 changes: 3 additions & 0 deletions lib/Parse/ParsePattern.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -192,6 +192,7 @@ Parser::parseParameterClause(SourceLoc &leftParenLoc,
bool isClosure = paramContext == ParameterContextKind::Closure;
return parseList(tok::r_paren, leftParenLoc, rightParenLoc,
/*AllowSepAfterLast=*/false,
/*AllowSepOmission=*/false,
diag::expected_rparen_parameter,
SyntaxKind::FunctionParameterList,
[&]() -> ParserStatus {
Expand Down Expand Up @@ -858,6 +859,7 @@ ParserResult<Pattern> Parser::parseTypedPattern() {
ParserStatus status = parseExprList(tok::l_paren, tok::r_paren,
/*isPostfix=*/true,
/*isExprBasic=*/false,
/*allowSepOmission=*/false,
lParenLoc, args, argLabels,
argLabelLocs, rParenLoc,
trailingClosure,
Expand Down Expand Up @@ -1033,6 +1035,7 @@ ParserResult<Pattern> Parser::parsePatternTuple() {
ParserStatus ListStatus =
parseList(tok::r_paren, LPLoc, RPLoc,
/*AllowSepAfterLast=*/false,
/*AllowSepOmission=*/false,
diag::expected_rparen_tuple_pattern_list,
SyntaxKind::TuplePatternElementList,
[&] () -> ParserStatus {
Expand Down
2 changes: 2 additions & 0 deletions lib/Parse/ParseStmt.cpp
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Expand Up @@ -62,6 +62,7 @@ bool Parser::isStartOfStmt() {
case tok::pound_warning:
case tok::pound_error:
case tok::pound_sourceLocation:
if (peekToken().is(tok::colon)) return false;
return true;

case tok::pound_line:
Expand Down Expand Up @@ -868,6 +869,7 @@ ParserResult<Stmt> Parser::parseStmtYield(SourceLoc tryLoc) {
status = parseExprList(tok::l_paren, tok::r_paren,
/*postfix (allow trailing closure)*/ false,
/*expr basic (irrelevant)*/ true,
/*allow separator omission*/ false,
lpLoc,
yields, yieldLabels, yieldLabelLocs,
rpLoc,
Expand Down
1 change: 1 addition & 0 deletions lib/Parse/ParseType.cpp
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Expand Up @@ -880,6 +880,7 @@ ParserResult<TupleTypeRepr> Parser::parseTypeTupleBody() {

ParserStatus Status = parseList(tok::r_paren, LPLoc, RPLoc,
/*AllowSepAfterLast=*/false,
/*AllowSepOmission=*/false,
diag::expected_rparen_tuple_type_list,
SyntaxKind::TupleTypeElementList,
[&] () -> ParserStatus {
Expand Down
8 changes: 6 additions & 2 deletions lib/Parse/Parser.cpp
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Expand Up @@ -953,7 +953,8 @@ static SyntaxKind getListElementKind(SyntaxKind ListKind) {

ParserStatus
Parser::parseList(tok RightK, SourceLoc LeftLoc, SourceLoc &RightLoc,
bool AllowSepAfterLast, Diag<> ErrorDiag, SyntaxKind Kind,
bool AllowSepAfterLast, bool AllowSepOmission,
Diag<> ErrorDiag, SyntaxKind Kind,
llvm::function_ref<ParserStatus()> callback) {
auto TokIsStringInterpolationEOF = [&]() -> bool {
return Tok.is(tok::eof) && Tok.getText() == ")" && RightK == tok::r_paren;
Expand Down Expand Up @@ -1016,7 +1017,7 @@ Parser::parseList(tok RightK, SourceLoc LeftLoc, SourceLoc &RightLoc,
}
// If we're in a comma-separated list, the next token is at the
// beginning of a new line and can never start an element, break.
if (Tok.isAtStartOfLine() &&
if (Tok.isAtStartOfLine() &&
(Tok.is(tok::r_brace) || isStartOfDecl() || isStartOfStmt())) {
break;
}
Expand All @@ -1026,6 +1027,9 @@ Parser::parseList(tok RightK, SourceLoc LeftLoc, SourceLoc &RightLoc,
break;
}

if (AllowSepOmission && Tok.isAtStartOfLine())
continue;

diagnose(Tok, diag::expected_separator, ",")
.fixItInsertAfter(PreviousLoc, ",");
Status.setIsParseError();
Expand Down
1 change: 1 addition & 0 deletions lib/ParseSIL/ParseSIL.cpp
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Expand Up @@ -1639,6 +1639,7 @@ bool SILParser::parseSILBBArgsAtBranch(SmallVector<SILValue, 6> &Args,

if (P.parseList(tok::r_paren, LParenLoc, RParenLoc,
/*AllowSepAfterLast=*/false,
/*AllowSepOmission=*/false,
diag::sil_basicblock_arg_rparen,
SyntaxKind::Unknown,
[&]() -> ParserStatus {
Expand Down
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