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lexer: add support for line continuations

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This commit is contained in:
Zack Buhman 2023-08-23 19:47:55 -07:00
parent c2c59495b3
commit c12374f5fd
1 changed files with 13 additions and 3 deletions
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16
lexer.cpp
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@ -188,8 +188,12 @@ std::optional<token_t> lexer_t::lex_token()
case ';': case ';':
while (!at_end_p() && peek() != '\n') advance(); while (!at_end_p() && peek() != '\n') advance();
break; break;
case ' ': case '\\':
if (match('\n')) { continue; }
else if (match('\r')) { if (match('\n')) continue; }
break;
case '\r': case '\r':
case ' ':
case '\t': case '\t':
break; break;
case '\n': case '\n':
@ -218,12 +222,18 @@ std::optional<token_t> lexer_t::lex_token()
if (hex_t::pred(peek())) { if (hex_t::pred(peek())) {
start_ix += 2; start_ix += 2;
return {_number<hex_t>()}; return {_number<hex_t>()};
} } else {
error(pos.line, pos.col, "expected hexadecimal literal");
return {};
}
} else if (match('b')) { } else if (match('b')) {
if (bin_t::pred(peek())) { if (bin_t::pred(peek())) {
start_ix += 2; start_ix += 2;
return {_number<bin_t>()}; return {_number<bin_t>()};
} } else {
error(pos.line, pos.col, "expected binary literal");
return {};
}
} }
[[fallthrough]]; [[fallthrough]];
default: default: