badmanners/maud
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Fix up some minor issues

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This commit is contained in:
Chris Wong 2018-04-16 20:27:41 +12:00
parent f75da83a60
commit dd9d892b8d
3 changed files with 53 additions and 60 deletions
maud_macros/src
build.rslib.rsparse.rs

15
maud_macros/src/build.rs
View file

@ -1,5 +1,6 @@
use proc_macro::{Delimiter, Group, Literal, Span, TokenStream, TokenTree};
use proc_macro::quote;
use maud_htmlescape::Escaper;
pub struct Builder {
@ -111,19 +112,13 @@ impl Builder {
// If the condition contains an opening brace `{`,
// wrap it in parentheses to avoid parse errors
if cond.clone().into_iter().any(|token| match token {
TokenTree::Group(grp) => {
if grp.delimiter() == Delimiter::Brace {
true
} else {
false
}
},
TokenTree::Group(group) => group.delimiter() == Delimiter::Brace,
_ => false,
}) {
let mut g = Group::new(Delimiter::Parenthesis, cond);
let mut group = Group::new(Delimiter::Parenthesis, cond);
// NOTE: Do we need to do this?
g.set_span(cond_span);
cond = TokenStream::from(TokenTree::Group(g));
group.set_span(cond_span);
cond = TokenStream::from(TokenTree::Group(group));
}
self.push(quote!(if $cond { $body }));
}

8
maud_macros/src/lib.rs
View file

@ -1,8 +1,11 @@
#![feature(proc_macro)]
#![feature(pattern_parentheses)]
#![doc(html_root_url = "https://docs.rs/maud_macros/0.17.2")]
// TokenStream values are reference counted, and the mental overhead of tracking
// lifetimes outweighs the marginal gains from explicit borrowing
#![cfg_attr(feature = "cargo-clippy", allow(needless_pass_by_value))]
extern crate literalext;
extern crate maud_htmlescape;
extern crate proc_macro;
@ -28,7 +31,6 @@ pub fn html_debug(input: TokenStream) -> TokenStream {
}
fn expand(input: TokenStream) -> TokenStream {
let output_ident = TokenTree::Term(Term::new("__maud_output", Span::def_site()));
// Heuristic: the size of the resulting markup tends to correlate with the
// code size of the template itself
@ -40,7 +42,7 @@ fn expand(input: TokenStream) -> TokenStream {
};
quote!({
extern crate maud;
let mut $output_ident = String::with_capacity($size_hint as usize);
let mut $output_ident = String::with_capacity($size_hint);
$stmts
maud::PreEscaped($output_ident)
})

88
maud_macros/src/parse.rs
View file

@ -4,12 +4,9 @@ use proc_macro::{
Literal,
Spacing,
Span,
Term,
TokenStream,
TokenTree,
};
use proc_macro::token_stream;
use std::iter;
use std::mem;
@ -30,7 +27,7 @@ struct Parser {
output_ident: TokenTree,
/// Indicates whether we're inside an attribute node.
in_attr: bool,
input: token_stream::IntoIter,
input: <TokenStream as IntoIterator>::IntoIter,
}
impl Iterator for Parser {
@ -99,15 +96,14 @@ impl Parser {
loop {
match self.peek2() {
None => return Ok(()),
Some((TokenTree::Op(o), _)) if o.op() == ';' => self.advance(),
Some((TokenTree::Op(o), Some(TokenTree::Term(term)))) if o.op() == '@' && term.as_str() == "let" => {
Some((TokenTree::Op(op), _)) if op.op() == ';' => self.advance(),
Some((TokenTree::Op(op), Some(TokenTree::Term(term)))) if op.op() == '@' && term.as_str() == "let" => {
// When emitting a `@let`, wrap the rest of the block in a
// new block to avoid scoping issues
let keyword = Term::new(term.as_str(), term.span());
self.advance2();
builder.push({
let mut builder = self.builder();
builder.push(TokenTree::Term(keyword));
builder.push(TokenTree::Term(term));
self.let_expr(&mut builder)?;
self.markups(&mut builder)?;
TokenTree::Group(Group::new(Delimiter::Brace, builder.build()))
@ -131,18 +127,17 @@ impl Parser {
self.literal(lit, builder)?;
},
// Special form
TokenTree::Op(o) if o.op() == '@' => {
TokenTree::Op(op) if op.op() == '@' => {
self.advance();
match self.next() {
Some(TokenTree::Term(term)) => {
let keyword = Term::new(term.as_str(), term.span());
builder.push(TokenTree::Term(keyword));
builder.push(TokenTree::Term(term));
match term.as_str() {
"if" => self.if_expr(builder)?,
"while" => self.while_expr(builder)?,
"for" => self.for_expr(builder)?,
"match" => self.match_expr(builder)?,
"let" => return self.error(format!("@let only works inside a block")),
"let" => return self.error("let only works inside a block"),
other => return self.error(format!("unknown keyword `@{}`", other)),
}
},
@ -155,14 +150,14 @@ impl Parser {
self.element(&name, builder)?;
},
// Splice
TokenTree::Group(ref grp) if grp.delimiter() == Delimiter::Parenthesis => {
TokenTree::Group(ref group) if group.delimiter() == Delimiter::Parenthesis => {
self.advance();
builder.splice(grp.stream());
builder.splice(group.stream());
},
// Block
TokenTree::Group(ref grp) if grp.delimiter() == Delimiter::Brace => {
TokenTree::Group(ref group) if group.delimiter() == Delimiter::Brace => {
self.advance();
self.with_input(grp.stream()).markups(builder)?;
self.with_input(group.stream()).markups(builder)?;
},
// ???
_ => return self.error("invalid syntax"),
@ -186,8 +181,7 @@ impl Parser {
fn if_expr(&mut self, builder: &mut Builder) -> ParseResult<()> {
loop {
match self.next() {
Some(TokenTree::Group(ref block))
if block.delimiter() == Delimiter::Brace => {
Some(TokenTree::Group(ref block)) if block.delimiter() == Delimiter::Brace => {
let block = self.block(block.stream(), block.span())?;
builder.push(block);
break;
@ -204,28 +198,27 @@ impl Parser {
/// The leading `@else if` or `@else` should *not* already be consumed.
fn else_if_expr(&mut self, builder: &mut Builder) -> ParseResult<()> {
match self.peek2() {
Some((TokenTree::Op(o), Some(TokenTree::Term(else_keyword))))
if o.op() == '@' && else_keyword.as_str() == "else" => {
Some((
TokenTree::Op(op),
Some(TokenTree::Term(else_keyword)),
)) if op.op() == '@' && else_keyword.as_str() == "else" => {
self.advance2();
let else_keyword = Term::new("else", else_keyword.span());
builder.push(TokenTree::Term(else_keyword));
match self.peek() {
// `@else if`
Some(TokenTree::Term(if_keyword)) if if_keyword.as_str() == "if" => {
self.advance();
let if_keyword = Term::new("if", if_keyword.span());
builder.push(TokenTree::Term(if_keyword));
self.if_expr(builder)?;
},
// Just an `@else`
_ => {
// match brace `{`
match self.next() {
Some(TokenTree::Group(ref grp)) if grp.delimiter() == Delimiter::Brace => {
let block = self.block(grp.stream(), grp.span())?;
Some(TokenTree::Group(ref group)) if group.delimiter() == Delimiter::Brace => {
let block = self.block(group.stream(), group.span())?;
builder.push(block);
},
_ => { return self.error("expected body for @else"); },
_ => return self.error("expected body for @else"),
}
},
}
@ -261,7 +254,6 @@ impl Parser {
loop {
match self.next() {
Some(TokenTree::Term(in_keyword)) if in_keyword.as_str() == "in" => {
let in_keyword = Term::new("in", in_keyword.span());
builder.push(TokenTree::Term(in_keyword));
break;
},
@ -290,8 +282,10 @@ impl Parser {
loop {
match self.next() {
Some(TokenTree::Group(ref body)) if body.delimiter() == Delimiter::Brace => {
let span = body.span();
let body = self.with_input(body.stream()).match_arms()?;
let body = Group::new(Delimiter::Brace, body);
let mut body = Group::new(Delimiter::Brace, body);
body.set_span(span);
builder.push(TokenTree::Group(body));
break;
},
@ -311,7 +305,7 @@ impl Parser {
}
fn match_arm(&mut self) -> ParseResult<Option<TokenStream>> {
let mut pat: Vec<TokenTree> = Vec::new();
let mut pat = Vec::new();
loop {
match self.peek2() {
Some((TokenTree::Op(eq), Some(TokenTree::Op(gt))))
@ -336,10 +330,10 @@ impl Parser {
let body = match self.next() {
// $pat => { $stmts }
Some(TokenTree::Group(ref body)) if body.delimiter() == Delimiter::Brace => {
let body: TokenTree = self.block(body.stream(), body.span())?;
let body = self.block(body.stream(), body.span())?;
// Trailing commas are optional if the match arm is a braced block
if let Some(TokenTree::Op(o)) = self.peek() {
if o.op() == ',' {
if let Some(TokenTree::Op(op)) = self.peek() {
if op.op() == ',' {
self.advance();
}
}
@ -376,10 +370,10 @@ impl Parser {
match self.next() {
Some(token) => {
match token {
TokenTree::Op(ref o) if o.op() == '=' => {
TokenTree::Op(ref op) if op.op() == '=' => {
builder.push(token.clone());
break;
}
},
_ => builder.push(token),
}
},
@ -390,7 +384,7 @@ impl Parser {
match self.next() {
Some(token) => {
match token {
TokenTree::Op(ref o) if o.op() == ';' => {
TokenTree::Op(ref op) if op.op() == ';' => {
builder.push(token.clone());
break;
},
@ -437,7 +431,7 @@ impl Parser {
let token_after = attempt.next();
match (maybe_name, token_after) {
// Non-empty attribute
(Ok(ref name), Some(TokenTree::Op(ref o))) if o.op() == '=' => {
(Ok(ref name), Some(TokenTree::Op(ref op))) if op.op() == '=' => {
self.commit(attempt);
builder.attribute_start(&name);
{
@ -449,7 +443,7 @@ impl Parser {
builder.attribute_end();
},
// Empty attribute
(Ok(ref name), Some(TokenTree::Op(ref o))) if o.op() == '?' => {
(Ok(ref name), Some(TokenTree::Op(ref op))) if op.op() == '?' => {
self.commit(attempt);
if let Some((cond, cond_span)) = self.attr_toggler() {
// Toggle the attribute based on a boolean expression
@ -465,7 +459,7 @@ impl Parser {
}
},
// Class shorthand
(Err(_), Some(TokenTree::Op(o))) if o.op() == '.' => {
(Err(_), Some(TokenTree::Op(op))) if op.op() == '.' => {
self.commit(attempt);
let class_name = self.name()?;
if let Some((cond, cond_span)) = self.attr_toggler() {
@ -477,7 +471,7 @@ impl Parser {
}
},
// ID shorthand
(Err(_), Some(TokenTree::Op(o))) if o.op() == '#' => {
(Err(_), Some(TokenTree::Op(op))) if op.op() == '#' => {
self.commit(attempt);
ids.push(self.name()?);
},
@ -517,8 +511,8 @@ impl Parser {
Some(TokenTree::Group(ref grp)) if grp.delimiter() == Delimiter::Bracket => {
self.advance();
Some((grp.stream(), grp.span()))
}
_ => None
},
_ => None,
}
}
@ -533,7 +527,7 @@ impl Parser {
let mut expect_ident = false;
loop {
expect_ident = match self.peek() {
Some(TokenTree::Op(o)) if o.op() == '-' => {
Some(TokenTree::Op(op)) if op.op() == '-' => {
self.advance();
s.push('-');
true
@ -553,8 +547,8 @@ impl Parser {
/// if necessary.
fn namespaced_name(&mut self) -> ParseResult<String> {
let mut s = self.name()?;
if let Some(TokenTree::Op(o)) = self.peek() {
if o.op() == ':' {
if let Some(TokenTree::Op(op)) = self.peek() {
if op.op() == ':' {
self.advance();
s.push(':');
s.push_str(&self.name()?);
@ -565,9 +559,11 @@ impl Parser {
/// Parses the given token stream as a Maud expression, returning a block of
/// Rust code.
fn block(&mut self, body: TokenStream, _span: Span) -> ParseResult<TokenTree> {
fn block(&mut self, body: TokenStream, span: Span) -> ParseResult<TokenTree> {
let mut builder = self.builder();
self.with_input(body).markups(&mut builder)?;
Ok(TokenTree::Group(Group::new(Delimiter::Brace, builder.build())))
let mut group = Group::new(Delimiter::Brace, builder.build());
group.set_span(span);
Ok(TokenTree::Group(group))
}
}