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Implement character escape sequences

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This commit is contained in:
Eugen Wissner
2025-01-22 20:19:26 +01:00
parent 156506e8fa
commit 0dc95d4466
7 changed files with 83 additions and 52 deletions
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15
source/ast.cc
View File

@ -752,20 +752,9 @@ namespace source
}
unary_expression::unary_expression(const struct position position, expression *operand,
const unsigned char operation)
: expression(position), m_operand(std::move(operand))
const unary_operator operation)
: expression(position), m_operand(std::move(operand)), m_operator(operation)
{
switch (operation)
{
case '@':
this->m_operator = unary_operator::reference;
break;
case '!':
this->m_operator = unary_operator::negation;
break;
default:
__builtin_unreachable();
}
}
void unary_expression::accept(parser_visitor *visitor)

45
source/lexer.ll
View File

@ -112,13 +112,50 @@ return {
[0-9]+\.[0-9] {
return yy::parser::make_FLOAT(strtof(yytext, NULL), this->location);
}
'[^']' {
return yy::parser::make_CHARACTER(
std::string(yytext, 1, strlen(yytext) - 2), this->location);
'[[:print:]]' {
if (yytext[1] == '\\')
{
REJECT;
}
else
{
return yy::parser::make_CHARACTER(std::string(yytext, 1, 1), this->location);
}
}
'\\[0nabtfrv\\'"?]' {
switch (yytext[2])
{
case 'n':
return yy::parser::make_CHARACTER(std::string("\n"), this->location);
case 'a':
return yy::parser::make_CHARACTER(std::string("\a"), this->location);
case 'b':
return yy::parser::make_CHARACTER(std::string("\b"), this->location);
case 't':
return yy::parser::make_CHARACTER(std::string("\t"), this->location);
case 'f':
return yy::parser::make_CHARACTER(std::string("\f"), this->location);
case 'r':
return yy::parser::make_CHARACTER(std::string("\r"), this->location);
case 'v':
return yy::parser::make_CHARACTER(std::string("\v"), this->location);
case '\\':
return yy::parser::make_CHARACTER(std::string("\\"), this->location);
case '\'':
return yy::parser::make_CHARACTER(std::string("'"), this->location);
case '"':
return yy::parser::make_CHARACTER(std::string("\""), this->location);
case '?':
return yy::parser::make_CHARACTER(std::string("\?"), this->location);
case '0':
return yy::parser::make_CHARACTER(std::string("\0", 1), this->location);
default:
REJECT;
}
}
\"[^\"]*\" {
return yy::parser::make_STRING(
std::string(yytext, 1, strlen(yytext) - 2), this->location);
std::string(yytext, 1, strlen(yytext) - 2), this->location);
}
\( {
return yy::parser::make_LEFT_PAREN(this->location);

8
source/parser.yy
View File

@ -227,6 +227,7 @@ literal:
pointer:
literal { $$ = $1; }
| designator_expression { $$ = $1; }
| call_expression { $$ = $1; }
| LEFT_PAREN expression RIGHT_PAREN { $$ = std::move($2); }
summand:
factor { $$ = std::move($1); }
@ -243,11 +244,13 @@ summand:
factor:
AT pointer
{
$$ = new elna::source::unary_expression(elna::source::make_position(@1), $2, '@');
$$ = new elna::source::unary_expression(elna::source::make_position(@1), $2,
elna::source::unary_operator::reference);
}
| NOT pointer
{
$$ = new elna::source::unary_expression(elna::source::make_position(@1), $2, '!');
$$ = new elna::source::unary_expression(elna::source::make_position(@1), $2,
elna::source::unary_operator::negation);
}
| pointer { $$ = $1; }
comparand:
@ -296,7 +299,6 @@ expression:
$$ = new elna::source::binary_expression(elna::source::make_position(@1), $1, $3, 'o');
}
| logical_operand { $$ = $1; }
| call_expression { $$ = $1; }
expressions:
expression COMMA expressions
{