Enum cranelift_isle::lexer::Token
source · Expand description
A token of ISLE source.
Variants§
LParen
Left paren.
RParen
Right paren.
Symbol(String)
A symbol, e.g. Foo.
Int(i128)
An integer.
At
@
Implementations§
source§impl Token
impl Token
sourcepub fn is_int(&self) -> bool
pub fn is_int(&self) -> bool
Is this an Int token?
Examples found in repository?
src/parser.rs (line 86)
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fn is_int(&self) -> bool {
self.is(|tok| tok.is_int())
}
fn is_sym_str(&self, s: &str) -> bool {
self.is(|tok| match tok {
&Token::Symbol(ref tok_s) if tok_s == s => true,
_ => false,
})
}
fn is_const(&self) -> bool {
self.is(|tok| match tok {
&Token::Symbol(ref tok_s) if tok_s.starts_with("$") => true,
_ => false,
})
}
fn lparen(&mut self) -> Result<()> {
self.take(|tok| *tok == Token::LParen).map(|_| ())
}
fn rparen(&mut self) -> Result<()> {
self.take(|tok| *tok == Token::RParen).map(|_| ())
}
fn at(&mut self) -> Result<()> {
self.take(|tok| *tok == Token::At).map(|_| ())
}
fn symbol(&mut self) -> Result<String> {
match self.take(|tok| tok.is_sym())? {
Token::Symbol(s) => Ok(s),
_ => unreachable!(),
}
}
fn int(&mut self) -> Result<i128> {
match self.take(|tok| tok.is_int())? {
Token::Int(i) => Ok(i),
_ => unreachable!(),
}
}sourcepub fn is_sym(&self) -> bool
pub fn is_sym(&self) -> bool
Is this a Sym token?
Examples found in repository?
src/parser.rs (line 83)
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fn is_sym(&self) -> bool {
self.is(|tok| tok.is_sym())
}
fn is_int(&self) -> bool {
self.is(|tok| tok.is_int())
}
fn is_sym_str(&self, s: &str) -> bool {
self.is(|tok| match tok {
&Token::Symbol(ref tok_s) if tok_s == s => true,
_ => false,
})
}
fn is_const(&self) -> bool {
self.is(|tok| match tok {
&Token::Symbol(ref tok_s) if tok_s.starts_with("$") => true,
_ => false,
})
}
fn lparen(&mut self) -> Result<()> {
self.take(|tok| *tok == Token::LParen).map(|_| ())
}
fn rparen(&mut self) -> Result<()> {
self.take(|tok| *tok == Token::RParen).map(|_| ())
}
fn at(&mut self) -> Result<()> {
self.take(|tok| *tok == Token::At).map(|_| ())
}
fn symbol(&mut self) -> Result<String> {
match self.take(|tok| tok.is_sym())? {
Token::Symbol(s) => Ok(s),
_ => unreachable!(),
}
}
fn int(&mut self) -> Result<i128> {
match self.take(|tok| tok.is_int())? {
Token::Int(i) => Ok(i),
_ => unreachable!(),
}
}
fn parse_defs(mut self) -> Result<Defs> {
let mut defs = vec![];
while !self.lexer.eof() {
defs.push(self.parse_def()?);
}
Ok(Defs {
defs,
filenames: self.lexer.filenames,
file_texts: self.lexer.file_texts,
})
}
fn parse_def(&mut self) -> Result<Def> {
self.lparen()?;
let pos = self.pos();
let def = match &self.symbol()?[..] {
"pragma" => Def::Pragma(self.parse_pragma()?),
"type" => Def::Type(self.parse_type()?),
"decl" => Def::Decl(self.parse_decl()?),
"rule" => Def::Rule(self.parse_rule()?),
"extractor" => Def::Extractor(self.parse_etor()?),
"extern" => Def::Extern(self.parse_extern()?),
"convert" => Def::Converter(self.parse_converter()?),
s => {
return Err(self.error(pos, format!("Unexpected identifier: {}", s)));
}
};
self.rparen()?;
Ok(def)
}
fn str_to_ident(&self, pos: Pos, s: &str) -> Result<Ident> {
let first = s
.chars()
.next()
.ok_or_else(|| self.error(pos, "empty symbol".into()))?;
if !first.is_alphabetic() && first != '_' && first != '$' {
return Err(self.error(
pos,
format!("Identifier '{}' does not start with letter or _ or $", s),
));
}
if s.chars()
.skip(1)
.any(|c| !c.is_alphanumeric() && c != '_' && c != '.' && c != '$')
{
return Err(self.error(
pos,
format!(
"Identifier '{}' contains invalid character (not a-z, A-Z, 0-9, _, ., $)",
s
),
));
}
Ok(Ident(s.to_string(), pos))
}
fn parse_ident(&mut self) -> Result<Ident> {
let pos = self.pos();
let s = self.symbol()?;
self.str_to_ident(pos, &s)
}
fn parse_const(&mut self) -> Result<Ident> {
let pos = self.pos();
let ident = self.parse_ident()?;
if ident.0.starts_with("$") {
let s = &ident.0[1..];
Ok(Ident(s.to_string(), ident.1))
} else {
Err(self.error(
pos,
"Not a constant identifier; must start with a '$'".to_string(),
))
}
}
fn parse_pragma(&mut self) -> Result<Pragma> {
let ident = self.parse_ident()?;
// currently, no pragmas are defined, but the infrastructure is useful to keep around
match ident.0.as_str() {
pragma => Err(self.error(ident.1, format!("Unknown pragma '{}'", pragma))),
}
}
fn parse_type(&mut self) -> Result<Type> {
let pos = self.pos();
let name = self.parse_ident()?;
let mut is_extern = false;
let mut is_nodebug = false;
while self.lexer.peek().map_or(false, |(_pos, tok)| tok.is_sym()) {
let sym = self.symbol()?;
if sym == "extern" {
is_extern = true;
} else if sym == "nodebug" {
is_nodebug = true;
} else {
return Err(self.error(
self.pos(),
format!("unknown type declaration modifier: {}", sym),
));
}
}
let ty = self.parse_typevalue()?;
Ok(Type {
name,
is_extern,
is_nodebug,
ty,
pos,
})
}