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use std::char;
use std::num;
use crate::ast;
use crate::parser;
fn parse_integer_literal<I, P, C, T>(
span: codespan::ByteSpan,
input: &str,
errors: &mut Vec<lalrpop_util::ParseError<usize, T, parser::Error>>,
suffix_len: usize,
default: I,
parser: P,
ctor: C,
) -> ast::NumberValue
where
P: FnOnce(&str) -> Result<I, num::ParseIntError>,
C: FnOnce(I) -> ast::NumberValue,
{
let input = &input[..input.len() - suffix_len];
if input.is_empty() {
ctor(default)
} else {
match parser(input) {
Ok(value) => ctor(value),
Err(cause) => {
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::IllegalIntLiteral { token: span, cause },
});
ast::NumberValue::Invalid
}
}
}
}
fn parse_float_literal<I, P, C, T>(
span: codespan::ByteSpan,
input: &str,
errors: &mut Vec<lalrpop_util::ParseError<usize, T, parser::Error>>,
suffix_len: usize,
default: I,
parser: P,
ctor: C,
) -> ast::NumberValue
where
P: FnOnce(&str) -> Result<I, num::ParseFloatError>,
C: FnOnce(I) -> ast::NumberValue,
{
let input = &input[..input.len() - suffix_len];
if input.is_empty() {
ctor(default)
} else {
match parser(input) {
Ok(value) => ctor(value),
Err(cause) => {
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::IllegalFloatLiteral { token: span, cause },
});
ast::NumberValue::Invalid
}
}
}
}
pub fn parse_number_literal<T>(
span: codespan::ByteSpan,
lo: usize,
hi: usize,
input: &str,
errors: &mut Vec<lalrpop_util::ParseError<usize, T, parser::Error>>,
) -> ast::NumberValue {
use std::str::FromStr;
let span = span.subspan(
codespan::ByteOffset(lo as codespan::RawOffset),
codespan::ByteOffset(hi as codespan::RawOffset),
);
if input.ends_with("u8") {
parse_integer_literal(
span,
input,
errors,
2,
0u8,
u8::from_str,
ast::NumberValue::U8,
)
} else if input.ends_with("u16") {
parse_integer_literal(
span,
input,
errors,
3,
0u16,
u16::from_str,
ast::NumberValue::U16,
)
} else if input.ends_with("u32") {
parse_integer_literal(
span,
input,
errors,
3,
0u32,
u32::from_str,
ast::NumberValue::U32,
)
} else if input.ends_with("u64") {
parse_integer_literal(
span,
input,
errors,
3,
0u64,
u64::from_str,
ast::NumberValue::U64,
)
} else if input.ends_with("i8") {
parse_integer_literal(
span,
input,
errors,
2,
0i8,
i8::from_str,
ast::NumberValue::I8,
)
} else if input.ends_with("i16") {
parse_integer_literal(
span,
input,
errors,
3,
0i16,
i16::from_str,
ast::NumberValue::I16,
)
} else if input.ends_with("i32") {
parse_integer_literal(
span,
input,
errors,
3,
0i32,
i32::from_str,
ast::NumberValue::I32,
)
} else if input.ends_with("i64") {
parse_integer_literal(
span,
input,
errors,
3,
0i64,
i64::from_str,
ast::NumberValue::I64,
)
} else if input.ends_with("f32") {
parse_float_literal(
span,
input,
errors,
3,
0f32,
f32::from_str,
ast::NumberValue::F32,
)
} else if input.ends_with("f64") {
parse_float_literal(
span,
input,
errors,
3,
0f64,
f64::from_str,
ast::NumberValue::F64,
)
} else {
unreachable!()
}
}
pub fn parse_escaped_string<T>(
span: codespan::ByteSpan,
lo: usize,
hi: usize,
input: &str,
errors: &mut Vec<lalrpop_util::ParseError<usize, T, parser::Error>>,
) -> ast::StringValue {
let input = &input[1..input.len() - 1];
let span = span.subspan(
codespan::ByteOffset(lo as codespan::RawOffset),
codespan::ByteOffset(hi as codespan::RawOffset),
);
if input.contains('\\') {
enum State {
Normal,
Escape,
Unicode,
};
let mut result = String::with_capacity(input.len());
let mut state = State::Normal;
let mut unicode_start = codespan::ByteOffset(0);
let mut unicode: u32 = 0;
let mut is_invalid = false;
for (i, c) in input.char_indices() {
match state {
State::Normal => {
if c == '\\' {
state = State::Escape;
} else {
result.push(c);
}
}
State::Escape => match c {
'"' => {
result.push('"');
state = State::Normal
}
'\\' => {
result.push('\\');
state = State::Normal
}
'/' => {
result.push('/');
state = State::Normal
}
'b' => {
result.push('\u{0008}');
state = State::Normal
}
'f' => {
result.push('\u{000C}');
state = State::Normal
}
'n' => {
result.push('\n');
state = State::Normal
}
'r' => {
result.push('\r');
state = State::Normal
}
't' => {
result.push('\t');
state = State::Normal
}
'u' => state = State::Unicode,
_ => {
// Omit +1 here to include the previous \ character
let escape_start = codespan::ByteOffset(i as codespan::RawOffset);
// The +1 is for the initial quote char
let escape_end = codespan::ByteOffset((i + 1) as codespan::RawOffset);
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::IllegalEscapeSequence {
token: span,
escape: span.subspan(escape_start, escape_end),
bad_escape_char: c,
},
});
state = State::Normal;
is_invalid = true;
}
},
State::Unicode => match c {
'{' => {
unicode = 0;
// The +1 is for the initial quote char
unicode_start = codespan::ByteOffset((i + 1) as codespan::RawOffset);
}
'a'...'f' => {
unicode = (c as u32 - 'a' as u32 + 10) + 16 * unicode;
}
'A'...'F' => {
unicode = (c as u32 - 'A' as u32 + 10) + 16 * unicode;
}
'0'...'9' => {
unicode = (c as u32 - '0' as u32) + 16 * unicode;
}
'}' => {
// Adjust to not include leading {
let unicode_start = unicode_start + codespan::ByteOffset(1);
// The +1 is for the initial quote char
let unicode_end = codespan::ByteOffset((i + 1) as codespan::RawOffset);
match char::from_u32(unicode) {
Some(c) => {
result.push(c);
state = State::Normal;
}
None => {
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::IllegalUnicode {
token: span,
escape: span.subspan(unicode_start, unicode_end),
bad_codepoint: unicode,
},
});
state = State::Normal;
is_invalid = true;
}
}
}
_ => {
// Adjust to include leading \
let unicode_start = unicode_start - codespan::ByteOffset(2);
// The +1 is for the initial quote char
let unicode_end = codespan::ByteOffset((i + 1) as codespan::RawOffset);
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::UnterminatedUnicodeEscapeSequence {
token: span,
escape: span.subspan(unicode_start, unicode_end),
},
});
state = State::Normal;
is_invalid = true;
}
},
}
}
match state {
State::Normal => {}
State::Escape => {
// Omit +1 here to include the previous \ character
let escape_start = codespan::ByteOffset(input.len() as codespan::RawOffset);
// The +1 is for the initial quote char
let escape_end = codespan::ByteOffset((input.len() + 1) as codespan::RawOffset);
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::IllegalEscapeSequence {
token: span,
escape: span.subspan(escape_start, escape_end),
bad_escape_char: '"',
},
});
is_invalid = true;
}
State::Unicode => {
// Adjust to include leading \
let unicode_start = unicode_start - codespan::ByteOffset(2);
// The +1 is for the initial quote char
let unicode_end = codespan::ByteOffset((input.len() + 1) as codespan::RawOffset);
errors.push(lalrpop_util::ParseError::User {
error: parser::Error::UnterminatedUnicodeEscapeSequence {
token: span,
escape: span.subspan(unicode_start, unicode_end),
},
});
is_invalid = true;
}
}
if is_invalid {
ast::StringValue::Invalid
} else {
ast::StringValue::String(result.to_owned())
}
} else {
ast::StringValue::String(input.to_owned())
}
}