diff options
Diffstat (limited to 'askama_shared/src/generator.rs')
| -rw-r--r-- | askama_shared/src/generator.rs | 216 |
1 files changed, 119 insertions, 97 deletions
diff --git a/askama_shared/src/generator.rs b/askama_shared/src/generator.rs index 2385784..af7c3e6 100644 --- a/askama_shared/src/generator.rs +++ b/askama_shared/src/generator.rs @@ -1,4 +1,5 @@ use filters; +use input::TemplateInput; use parser::{self, Cond, Expr, Macro, Node, Target, WS}; use path; @@ -10,53 +11,78 @@ use std::collections::{HashMap, HashSet}; use syn; -pub fn generate(ast: &syn::DeriveInput, path: &Path, nodes: &[Node]) -> String { - let mut base: Option<&Expr> = None; - let mut blocks = Vec::new(); - let mut macros = HashMap::new(); - for n in nodes.iter() { - match *n { - Node::Extends(ref path) => { - match base { - Some(_) => panic!("multiple extend blocks found"), - None => { base = Some(path); }, - } - }, - ref def @ Node::BlockDef(_, _, _, _) => { - blocks.push(def); - }, - Node::Macro(name, ref m) => { - macros.insert(name, m); - }, - _ => {}, + +pub fn generate(input: &TemplateInput, nodes: &[Node]) -> String { + State::new(input, nodes).generate() +} + +struct State<'a> { + input: &'a TemplateInput<'a>, + nodes: &'a [Node<'a>], + blocks: Vec<&'a Node<'a>>, + macros: MacroMap<'a>, + trait_name: String, + derived: bool, +} + +impl<'a> State<'a> { + fn new<'n>(input: &'n TemplateInput, nodes: &'n [Node]) -> State<'n> { + let mut base: Option<&Expr> = None; + let mut blocks = Vec::new(); + let mut macros = HashMap::new(); + for n in nodes.iter() { + match *n { + Node::Extends(ref path) => { + match base { + Some(_) => panic!("multiple extend blocks found"), + None => { base = Some(path); }, + } + }, + ref def @ Node::BlockDef(_, _, _, _) => { + blocks.push(def); + }, + Node::Macro(name, ref m) => { + macros.insert(name, m); + }, + _ => {}, + } + } + State { + input, + nodes, + blocks, + macros, + trait_name: trait_name_for_path(&base, &input.path), + derived: base.is_some(), } } - let mut gen = Generator::default(¯os); - if !blocks.is_empty() { - let trait_name = trait_name_for_path(&base, path); - if base.is_none() { - gen.define_trait(&trait_name, &blocks); + fn generate(&self) -> String { + let mut gen = Generator::default(); + if !self.blocks.is_empty() { + if !self.derived { + gen.define_trait(&self); + } else { + let parent_type = get_parent_type(self.input.ast) + .expect("expected field '_parent' in extending template struct"); + gen.deref_to_parent(&self, &parent_type); + } + + let trait_nodes = if !self.derived { Some(&self.nodes[..]) } else { None }; + gen.impl_trait(&self, trait_nodes); + gen.impl_template_for_trait(&self); } else { - let parent_type = get_parent_type(ast) - .expect("expected field '_parent' in extending template struct"); - gen.deref_to_parent(ast, &parent_type); + gen.impl_template(&self); } - - let trait_nodes = if base.is_none() { Some(&nodes[..]) } else { None }; - gen.impl_trait(ast, &trait_name, &blocks, trait_nodes); - gen.impl_template_for_trait(ast, base.is_some()); - } else { - gen.impl_template(ast, &nodes); - } - gen.impl_display(ast); - if cfg!(feature = "iron") { - gen.impl_modifier_response(ast); - } - if cfg!(feature = "rocket") { - gen.impl_responder(ast, path); + gen.impl_display(&self); + if cfg!(feature = "iron") { + gen.impl_modifier_response(&self); + } + if cfg!(feature = "rocket") { + gen.impl_responder(&self); + } + gen.result() } - gen.result() } fn trait_name_for_path(base: &Option<&Expr>, path: &Path) -> String { @@ -103,12 +129,11 @@ struct Generator<'a> { locals: SetChain<'a, &'a str>, next_ws: Option<&'a str>, skip_ws: bool, - macros: &'a MacroMap<'a>, } impl<'a> Generator<'a> { - fn new<'n>(macros: &'n MacroMap, locals: SetChain<'n, &'n str>, indent: u8) -> Generator<'n> { + fn new<'n>(locals: SetChain<'n, &'n str>, indent: u8) -> Generator<'n> { Generator { buf: String::new(), indent: indent, @@ -116,17 +141,16 @@ impl<'a> Generator<'a> { locals: locals, next_ws: None, skip_ws: false, - macros: macros, } } - fn default<'n>(macros: &'n MacroMap) -> Generator<'n> { - Self::new(macros, SetChain::new(), 0) + fn default<'n>() -> Generator<'n> { + Self::new(SetChain::new(), 0) } fn child<'n>(&'n mut self) -> Generator<'n> { let locals = SetChain::with_parent(&self.locals); - Self::new(self.macros, locals, self.indent) + Self::new(locals, self.indent) } /* Helper methods for writing to internal buffer */ @@ -369,8 +393,8 @@ impl<'a> Generator<'a> { self.writeln("))?;"); } - fn write_call(&mut self, ws: &WS, name: &str, args: &[Expr]) { - let def = self.macros.get(name).expect(&format!("macro '{}' not found", name)); + fn write_call(&mut self, state: &'a State, ws: &WS, name: &str, args: &[Expr]) { + let def = state.macros.get(name).expect(&format!("macro '{}' not found", name)); self.handle_ws(ws); self.locals.push(); self.writeln("{"); @@ -382,7 +406,7 @@ impl<'a> Generator<'a> { .expect(&format!("macro '{}' takes more than {} arguments", name, i))); self.writeln(";"); } - self.handle(&def.nodes); + self.handle(state, &def.nodes); self.flush_ws(&def.ws2); self.writeln("}"); self.locals.pop(); @@ -416,7 +440,7 @@ impl<'a> Generator<'a> { self.writeln(";"); } - fn write_cond(&mut self, conds: &'a [Cond], ws: &WS) { + fn write_cond(&mut self, state: &'a State, conds: &'a [Cond], ws: &WS) { for (i, &(ref cws, ref cond, ref nodes)) in conds.iter().enumerate() { self.handle_ws(cws); match *cond { @@ -436,14 +460,14 @@ impl<'a> Generator<'a> { } self.writeln(" {"); self.locals.push(); - self.handle(nodes); + self.handle(state, nodes); self.locals.pop(); } self.handle_ws(ws); self.writeln("}"); } - fn write_loop(&mut self, ws1: &WS, var: &'a Target, iter: &Expr, + fn write_loop(&mut self, state: &'a State, ws1: &WS, var: &'a Target, iter: &Expr, body: &'a [Node], ws2: &WS) { self.handle_ws(ws1); self.locals.push(); @@ -457,7 +481,7 @@ impl<'a> Generator<'a> { self.visit_expr(iter); self.writeln(").into_iter().enumerate() {"); - self.handle(body); + self.handle(state, body); self.handle_ws(ws2); self.writeln("}"); self.locals.pop(); @@ -469,8 +493,8 @@ impl<'a> Generator<'a> { self.prepare_ws(ws2); } - fn write_block_defs(&mut self, blocks: &'a [&'a Node]) { - for b in blocks { + fn write_block_defs(&mut self, state: &'a State) { + for b in &state.blocks { if let &&Node::BlockDef(ref ws1, ref name, ref nodes, ref ws2) = b { self.writeln("#[allow(unused_variables)]"); self.writeln(&format!( @@ -480,7 +504,7 @@ impl<'a> Generator<'a> { self.prepare_ws(ws1); self.locals.push(); - self.handle(nodes); + self.handle(state, nodes); self.locals.pop(); self.flush_ws(ws2); @@ -492,21 +516,21 @@ impl<'a> Generator<'a> { } } - fn handle_include(&mut self, ws: &WS, path: &str) { + fn handle_include(&mut self, state: &'a State, ws: &WS, path: &str) { self.prepare_ws(ws); let path = path::find_template_from_path(&path, None); let src = path::get_template_source(&path); let nodes = parser::parse(&src); let nested = { let mut gen = self.child(); - gen.handle(&nodes); + gen.handle(state, &nodes); gen.result() }; self.buf.push_str(&nested); self.flush_ws(ws); } - fn handle(&mut self, nodes: &'a [Node]) { + fn handle(&mut self, state: &'a State, nodes: &'a [Node]) { for n in nodes { match *n { Node::Lit(lws, val, rws) => { self.write_lit(lws, val, rws); } @@ -515,18 +539,18 @@ impl<'a> Generator<'a> { Node::LetDecl(ref ws, ref var) => { self.write_let_decl(ws, var); }, Node::Let(ref ws, ref var, ref val) => { self.write_let(ws, var, val); }, Node::Cond(ref conds, ref ws) => { - self.write_cond(conds, ws); + self.write_cond(state, conds, ws); }, Node::Loop(ref ws1, ref var, ref iter, ref body, ref ws2) => { - self.write_loop(ws1, var, iter, body, ws2); + self.write_loop(state, ws1, var, iter, body, ws2); }, Node::BlockDef(ref ws1, name, _, ref ws2) => { self.write_block(ws1, name, ws2); }, Node::Include(ref ws, ref path) => { - self.handle_include(ws, path); + self.handle_include(state, ws, path); }, - Node::Call(ref ws, name, ref args) => self.write_call(ws, name, args), + Node::Call(ref ws, name, ref args) => self.write_call(state, ws, name, args), Node::Macro(_, _) | Node::Extends(_) => {}, } @@ -535,11 +559,11 @@ impl<'a> Generator<'a> { // Writes header for the `impl` for `TraitFromPathName` or `Template` // for the given context struct. - fn write_header(&mut self, ast: &syn::DeriveInput, target: &str, extra_anno: &[&str]) { + fn write_header(&mut self, state: &'a State, target: &str, extra_anno: &[&str]) { let mut full_anno = Tokens::new(); let mut orig_anno = Tokens::new(); - let need_anno = ast.generics.lifetimes.len() > 0 || - ast.generics.ty_params.len() > 0 || + let need_anno = state.input.ast.generics.lifetimes.len() > 0 || + state.input.ast.generics.ty_params.len() > 0 || extra_anno.len() > 0; if need_anno { full_anno.append("<"); @@ -547,7 +571,7 @@ impl<'a> Generator<'a> { } let (mut full_sep, mut orig_sep) = (false, false); - for lt in &ast.generics.lifetimes { + for lt in &state.input.ast.generics.lifetimes { if full_sep { full_anno.append(","); } @@ -568,7 +592,7 @@ impl<'a> Generator<'a> { full_sep = true; } - for param in &ast.generics.ty_params { + for param in &state.input.ast.generics.ty_params { if full_sep { full_anno.append(","); } @@ -589,18 +613,18 @@ impl<'a> Generator<'a> { } let mut where_clause = Tokens::new(); - ast.generics.where_clause.to_tokens(&mut where_clause); + state.input.ast.generics.where_clause.to_tokens(&mut where_clause); self.writeln(&format!("impl{} {} for {}{}{} {{", - full_anno.as_str(), target, ast.ident.as_ref(), + full_anno.as_str(), target, state.input.ast.ident.as_ref(), orig_anno.as_str(), where_clause.as_str())); } // Implement `Template` for the given context struct. - fn impl_template(&mut self, ast: &syn::DeriveInput, nodes: &'a [Node]) { - self.write_header(ast, "::askama::Template", &vec![]); + fn impl_template(&mut self, state: &'a State) { + self.write_header(state, "::askama::Template", &vec![]); self.writeln("fn render_into(&self, writer: &mut ::std::fmt::Write) -> \ ::askama::Result<()> {"); - self.handle(nodes); + self.handle(state, state.nodes); self.flush_ws(&WS(false, false)); self.writeln("Ok(())"); self.writeln("}"); @@ -608,8 +632,8 @@ impl<'a> Generator<'a> { } // Implement `Display` for the given context struct. - fn impl_display(&mut self, ast: &syn::DeriveInput) { - self.write_header(ast, "::std::fmt::Display", &vec![]); + fn impl_display(&mut self, state: &'a State) { + self.write_header(state, "::std::fmt::Display", &vec![]); self.writeln("fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {"); self.writeln("self.render_into(f).map_err(|_| ::std::fmt::Error {})"); self.writeln("}"); @@ -617,8 +641,8 @@ impl<'a> Generator<'a> { } // Implement `Deref<Parent>` for an inheriting context struct. - fn deref_to_parent(&mut self, ast: &syn::DeriveInput, parent_type: &syn::Ty) { - self.write_header(ast, "::std::ops::Deref", &vec![]); + fn deref_to_parent(&mut self, state: &'a State, parent_type: &syn::Ty) { + self.write_header(state, "::std::ops::Deref", &vec![]); let mut tokens = Tokens::new(); parent_type.to_tokens(&mut tokens); self.writeln(&format!("type Target = {};", tokens.as_str())); @@ -629,19 +653,18 @@ impl<'a> Generator<'a> { } // Implement `TraitFromPathName` for the given context struct. - fn impl_trait(&mut self, ast: &syn::DeriveInput, trait_name: &str, - blocks: &'a [&'a Node], nodes: Option<&'a [Node]>) { - self.write_header(ast, &trait_name, &vec![]); - self.write_block_defs(blocks); + fn impl_trait(&mut self, state: &'a State, nodes: Option<&'a [Node]>) { + self.write_header(state, &state.trait_name, &vec![]); + self.write_block_defs(state); self.writeln("#[allow(unused_variables)]"); self.writeln(&format!( "fn render_trait_into(&self, timpl: &{}, writer: &mut ::std::fmt::Write) \ -> ::askama::Result<()> {{", - trait_name)); + state.trait_name)); if let Some(nodes) = nodes { - self.handle(nodes); + self.handle(state, nodes); self.flush_ws(&WS(false, false)); } else { self.writeln("self._parent.render_trait_into(self, writer)?;"); @@ -654,11 +677,11 @@ impl<'a> Generator<'a> { } // Implement `Template` for templates that implement a template trait. - fn impl_template_for_trait(&mut self, ast: &syn::DeriveInput, derived: bool) { - self.write_header(ast, "::askama::Template", &vec![]); + fn impl_template_for_trait(&mut self, state: &'a State) { + self.write_header(state, "::askama::Template", &vec![]); self.writeln("fn render_into(&self, writer: &mut ::std::fmt::Write) \ -> ::askama::Result<()> {"); - if derived { + if state.derived { self.writeln("self._parent.render_trait_into(self, writer)?;"); } else { self.writeln("self.render_trait_into(self, writer)?;"); @@ -669,19 +692,19 @@ impl<'a> Generator<'a> { } // Defines the `TraitFromPathName` trait. - fn define_trait(&mut self, trait_name: &str, blocks: &'a [&'a Node]) { - self.writeln(&format!("trait {} {{", &trait_name)); - self.write_block_defs(blocks); + fn define_trait(&mut self, state: &'a State) { + self.writeln(&format!("trait {} {{", state.trait_name)); + self.write_block_defs(state); self.writeln(&format!( "fn render_trait_into(&self, timpl: &{}, writer: &mut ::std::fmt::Write) \ -> ::askama::Result<()>;", - trait_name)); + state.trait_name)); self.writeln("}"); } // Implement iron's Modifier<Response> if enabled - fn impl_modifier_response(&mut self, ast: &syn::DeriveInput) { - self.write_header(ast, "::askama::iron::Modifier<::askama::iron::Response>", &vec![]); + fn impl_modifier_response(&mut self, state: &'a State) { + self.write_header(state, "::askama::iron::Modifier<::askama::iron::Response>", &vec![]); self.writeln("fn modify(self, res: &mut ::askama::iron::Response) {"); self.writeln("res.body = Some(Box::new(self.render().unwrap().into_bytes()));"); self.writeln("}"); @@ -689,8 +712,8 @@ impl<'a> Generator<'a> { } // Implement Rocket's `Responder`. - fn impl_responder(&mut self, ast: &syn::DeriveInput, path: &Path) { - self.write_header(ast, "::askama::rocket::Responder<'r>", &vec!["'r"]); + fn impl_responder(&mut self, state: &'a State) { + self.write_header(state, "::askama::rocket::Responder<'r>", &vec!["'r"]); self.writeln("fn respond_to(self, _: &::askama::rocket::Request) \ -> ::std::result::Result<\ ::askama::rocket::Response<'r>, ::askama::rocket::Status> {"); @@ -699,7 +722,7 @@ impl<'a> Generator<'a> { self.writeln("::askama::rocket::Response::build()"); self.indent(); - let ext = match path.extension() { + let ext = match state.input.path.extension() { Some(s) => s.to_str().unwrap(), None => "txt", }; @@ -716,7 +739,6 @@ impl<'a> Generator<'a> { fn result(self) -> String { self.buf } - } struct SetChain<'a, T: 'a> where T: cmp::Eq + hash::Hash { |