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extern crate syntex_syntax; use std::fs::File; use std::io; use std::path::Path; use syntex_syntax::ast; use syntex_syntax::attr; use syntex_syntax::codemap::{DUMMY_SP, respan}; use syntex_syntax::ext::base::{ IdentMacroExpander, MultiItemDecorator, MultiItemModifier, NamedSyntaxExtension, SyntaxExtension, TTMacroExpander, }; use syntex_syntax::ext::base::ExtCtxt; use syntex_syntax::ext::expand; use syntex_syntax::feature_gate; use syntex_syntax::parse::{self, token}; use syntex_syntax::print::{pp, pprust}; use syntex_syntax::ptr::P; pub type Pass = fn(ast::Crate) -> ast::Crate; pub struct Registry { macros: Vec<ast::MacroDef>, syntax_exts: Vec<NamedSyntaxExtension>, pre_expansion_passes: Vec<Box<Pass>>, post_expansion_passes: Vec<Box<Pass>>, cfg: Vec<P<ast::MetaItem>>, attrs: Vec<ast::Attribute>, } impl Registry { pub fn new() -> Registry { Registry { macros: Vec::new(), syntax_exts: Vec::new(), pre_expansion_passes: Vec::new(), post_expansion_passes: Vec::new(), cfg: Vec::new(), attrs: Vec::new(), } } pub fn add_cfg(&mut self, cfg: &str) { let meta_item = parse::parse_meta_from_source_str( "cfgspec".to_string(), cfg.to_string(), Vec::new(), &parse::ParseSess::new()); self.cfg.push(meta_item); } pub fn add_attr(&mut self, attr: &str) { let meta_item = parse::parse_meta_from_source_str( "attrspec".to_string(), attr.to_string(), Vec::new(), &parse::ParseSess::new()); self.attrs.push(respan(DUMMY_SP, ast::Attribute_ { id: attr::mk_attr_id(), style: ast::AttrStyle::Outer, value: meta_item, is_sugared_doc: false, })); } pub fn add_macro<F>(&mut self, name: &str, extension: F) where F: TTMacroExpander + 'static { let name = token::intern(name); let syntax_extension = SyntaxExtension::NormalTT( Box::new(extension), None, false ); self.syntax_exts.push((name, syntax_extension)); } pub fn add_ident_macro<F>(&mut self, name: &str, extension: F) where F: IdentMacroExpander + 'static { let name = token::intern(name); let syntax_extension = SyntaxExtension::IdentTT( Box::new(extension), None, false ); self.syntax_exts.push((name, syntax_extension)); } pub fn add_decorator<F>(&mut self, name: &str, extension: F) where F: MultiItemDecorator + 'static { let name = token::intern(name); let syntax_extension = SyntaxExtension::MultiDecorator(Box::new(extension)); self.syntax_exts.push((name, syntax_extension)); } pub fn add_modifier<F>(&mut self, name: &str, extension: F) where F: MultiItemModifier + 'static { let name = token::intern(name); let syntax_extension = SyntaxExtension::MultiModifier(Box::new(extension)); self.syntax_exts.push((name, syntax_extension)); } pub fn add_pre_expansion_pass(&mut self, pass: Pass) { self.pre_expansion_passes.push(Box::new(pass)) } pub fn add_post_expansion_pass(&mut self, pass: Pass) { self.post_expansion_passes.push(Box::new(pass)) } pub fn expand(self, crate_name: &str, src: &Path, dst: &Path) -> io::Result<()> { let sess = parse::ParseSess::new(); let mut krate = parse::parse_crate_from_file( src, self.cfg, &sess); krate.attrs.extend(self.attrs); let features = feature_gate::check_crate_macros( &sess.codemap(), &sess.span_diagnostic, &krate); let krate = self.pre_expansion_passes.iter() .fold(krate, |krate, f| (f)(krate)); let mut ecfg = expand::ExpansionConfig::default(crate_name.to_string()); ecfg.features = Some(&features); let cfg = Vec::new(); let mut gated_cfgs = Vec::new(); let ecx = ExtCtxt::new(&sess, cfg, ecfg, &mut gated_cfgs); let (krate, _) = expand::expand_crate(ecx, self.macros, self.syntax_exts, krate); let krate = self.post_expansion_passes.iter() .fold(krate, |krate, f| (f)(krate)); let dst = try!(File::create(dst)); let mut printer = pprust::rust_printer(Box::new(dst)); try!(printer.print_mod(&krate.module, &krate.attrs[..])); try!(printer.print_remaining_comments()); pp::eof(&mut printer.s) } }