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Helper function to convert tokens to passing_styles. #198

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Merged
hsutter merged 2 commits into from
Jan 9, 2023
Merged

Helper function to convert tokens to passing_styles. #198

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f0eac80
Helper function to convert tokens to passing_styles.
jbatez Jan 5, 2023
4956378
Merge branch 'main' of https://github.com/hsutter/cppfront
jbatez Jan 9, 2023
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94 changes: 34 additions & 60 deletions source/parse.h
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Original file line number Diff line number Diff line change
Expand Up @@ -241,7 +241,18 @@ struct expression_node
}
};

enum class passing_style { in=0, copy, inout, out, move, forward };
enum class passing_style { in=0, copy, inout, out, move, forward, invalid };
auto to_passing_style(token const& t) -> passing_style {
if (t.type() == lexeme::Identifier) {
if (t == "in" ) { return passing_style::in; }
if (t == "copy" ) { return passing_style::copy; }
if (t == "inout" ) { return passing_style::inout; }
if (t == "out" ) { return passing_style::out; }
if (t == "move" ) { return passing_style::move; }
if (t == "forward") { return passing_style::forward; }
}
return passing_style::invalid;
}
auto to_string_view(passing_style pass) -> std::string_view {
switch (pass) {
break;case passing_style::in : return "in";
Expand Down Expand Up @@ -1549,14 +1560,7 @@ class parser
return n;
}

if (curr().type() == lexeme::DecimalLiteral ||
curr().type() == lexeme::FloatLiteral ||
curr().type() == lexeme::StringLiteral ||
curr().type() == lexeme::CharacterLiteral ||
curr().type() == lexeme::BinaryLiteral ||
curr().type() == lexeme::HexadecimalLiteral
)
{
if (is_literal(curr().type())) {
n->expr = &curr();
next();
return n;
Expand Down Expand Up @@ -2047,16 +2051,11 @@ class parser
n->open_paren = open_paren;
n->inside_initializer = inside_initializer;

if (curr().type() == lexeme::Identifier && curr() == "out") {
pass = passing_style::out;
next();
}
else if (curr().type() == lexeme::Identifier && curr() == "move") {
pass = passing_style::move;
next();
}
else if (curr().type() == lexeme::Identifier && curr() == "forward") {
pass = passing_style::forward;
if (auto dir = to_passing_style(curr());
dir == passing_style::out || dir == passing_style::move || dir == passing_style::forward
)
{
pass = dir;
next();
}
auto x = expression();
Expand All @@ -2072,16 +2071,11 @@ class parser
while (curr().type() == lexeme::Comma) {
next();
pass = passing_style::in;
if (curr().type() == lexeme::Identifier && curr() == "out") {
pass = passing_style::out;
next();
}
else if (curr().type() == lexeme::Identifier && curr() == "move") {
pass = passing_style::move;
next();
}
else if (curr().type() == lexeme::Identifier && curr() == "forward") {
pass = passing_style::forward;
if (auto dir = to_passing_style(curr());
dir == passing_style::out || dir == passing_style::move || dir == passing_style::forward
)
{
pass = dir;
next();
}
auto expr = expression();
Expand Down Expand Up @@ -2959,51 +2953,31 @@ class parser
n->pass = returns ? passing_style::out : passing_style::in;
n->pos = curr().position();

if (curr().type() == lexeme::Identifier) {
if (curr() == "in") {
if (returns) {
if (auto dir = to_passing_style(curr()); dir != passing_style::invalid) {
if (returns) {
if (dir == passing_style::in) {
error("a return value cannot be 'in'");
return {};
}
n->pass = passing_style::in;
next();
}
else if (curr() == "copy") {
if (returns) {
if (dir == passing_style::copy) {
error("a return value cannot be 'copy'");
return {};
}
n->pass = passing_style::copy;
next();
}
else if (curr() == "inout") {
if (returns) {
if (dir == passing_style::inout) {
error("a return value cannot be 'inout'");
return {};
}
n->pass = passing_style::inout;
next();
}
else if (curr() == "out") {
if (!named) {
error("(temporary alpha limitation) an unnamed function cannot have an 'out' parameter");
return {};
}
n->pass = passing_style::out;
next();
}
else if (curr() == "move") {
if (returns) {
if (dir == passing_style::move) {
error("a return value cannot be 'move' (it is implicitly 'move'-out)");
return {};
}
n->pass = passing_style::move;
next();
}
else if (curr() == "forward") {
n->pass = passing_style::forward;
next();
if (!named && dir == passing_style::out) {
error("(temporary alpha limitation) an unnamed function cannot have an 'out' parameter");
return {};
}
n->pass = dir;
next();
}

if (curr().type() == lexeme::Identifier) {
Expand Down