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| 1 | +/* This Source Code Form is subject to the terms of the Mozilla Public |
| 2 | + * License, v. 2.0. If a copy of the MPL was not distributed with this |
| 3 | + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| 4 | + |
| 5 | +use std::error::Error; |
| 6 | +use syntax; |
| 7 | +use syntax::ast::{TokenTree, ExprLit, LitStr, Expr}; |
| 8 | +use syntax::codemap::Span; |
| 9 | +use syntax::ext::base::{ExtCtxt, MacResult, MacEager, DummyResult}; |
| 10 | +use syntax::ext::build::AstBuilder; |
| 11 | +use syntax::fold::Folder; |
| 12 | +use syntax::parse; |
| 13 | +use syntax::parse::token::InternedString; |
| 14 | +use url::{Url, Host, RelativeSchemeData, SchemeData}; |
| 15 | + |
| 16 | +pub fn expand_url(cx: &mut ExtCtxt, sp: Span, tts: &[TokenTree]) |
| 17 | + -> Box<MacResult + 'static> { |
| 18 | + let mut parser = parse::new_parser_from_tts(cx.parse_sess(), cx.cfg(), tts.to_vec()); |
| 19 | + let query_expr = cx.expander().fold_expr(parser.parse_expr()); |
| 20 | + |
| 21 | + // Ensure a str literal was passed to the macro |
| 22 | + let query = match parse_str_lit(&query_expr) { |
| 23 | + Some(query) => query, |
| 24 | + None => { |
| 25 | + cx.span_err(query_expr.span, "'url!' expected string literal"); |
| 26 | + return DummyResult::any(sp) |
| 27 | + }, |
| 28 | + }; |
| 29 | + |
| 30 | + // Parse the str literal |
| 31 | + let Url { scheme, scheme_data, query, fragment } = match Url::parse(&query) { |
| 32 | + Ok(url) => url, |
| 33 | + Err(error) => { |
| 34 | + cx.span_err(query_expr.span, error.description()); |
| 35 | + return DummyResult::any(sp) |
| 36 | + } |
| 37 | + }; |
| 38 | + |
| 39 | + let scheme_data_expr = cx.expr_scheme_data(sp, scheme_data); |
| 40 | + let query_expr = cx.expr_option_string(sp, query); |
| 41 | + let fragment_expr = cx.expr_option_string(sp, fragment); |
| 42 | + |
| 43 | + let url_expr = quote_expr!(cx, { |
| 44 | + ::url::Url { |
| 45 | + scheme: $scheme.to_owned(), |
| 46 | + scheme_data: $scheme_data_expr, |
| 47 | + query: $query_expr, |
| 48 | + fragment: $fragment_expr, |
| 49 | + } |
| 50 | + }); |
| 51 | + |
| 52 | + MacEager::expr(url_expr) |
| 53 | +} |
| 54 | + |
| 55 | +fn parse_str_lit(e: &Expr) -> Option<InternedString> { |
| 56 | + if let ExprLit(ref lit) = e.node { |
| 57 | + if let LitStr(ref s, _) = lit.node { |
| 58 | + return Some(s.clone()); |
| 59 | + } |
| 60 | + } |
| 61 | + None |
| 62 | +} |
| 63 | + |
| 64 | +trait ExtCtxtHelpers { |
| 65 | + fn expr_scheme_data(&self, sp: Span, scheme_data: SchemeData) -> syntax::ptr::P<Expr>; |
| 66 | + fn expr_option_string(&self, sp: Span, string: Option<String>) -> syntax::ptr::P<Expr>; |
| 67 | + fn expr_option_u16(&self, sp: Span, unsigned: Option<u16>) -> syntax::ptr::P<Expr>; |
| 68 | + fn expr_host(&self, sp: Span, host: Host) -> syntax::ptr::P<Expr>; |
| 69 | + fn expr_slice_u16(&self, sp: Span, unsigned: &[u16]) -> syntax::ptr::P<Expr>; |
| 70 | + fn expr_vec_string(&self, sp: Span, strings: Vec<String>) -> syntax::ptr::P<Expr>; |
| 71 | +} |
| 72 | + |
| 73 | +impl<'a> ExtCtxtHelpers for ExtCtxt<'a> { |
| 74 | + fn expr_scheme_data(&self, sp: Span, scheme_data: SchemeData) -> syntax::ptr::P<Expr> { |
| 75 | + match scheme_data { |
| 76 | + SchemeData::Relative( |
| 77 | + RelativeSchemeData { username, password, host, port, default_port, path }) => |
| 78 | + { |
| 79 | + let password_expr = self.expr_option_string(sp, password); |
| 80 | + let host_expr = self.expr_host(sp, host); |
| 81 | + let port_expr = self.expr_option_u16(sp, port); |
| 82 | + let default_port_expr = self.expr_option_u16(sp, default_port); |
| 83 | + let path_expr = self.expr_vec_string(sp, path); |
| 84 | + |
| 85 | + quote_expr!(self, |
| 86 | + ::url::SchemeData::Relative( |
| 87 | + ::url::RelativeSchemeData { |
| 88 | + username: $username.to_owned(), |
| 89 | + password: $password_expr, |
| 90 | + host: $host_expr, |
| 91 | + port: $port_expr, |
| 92 | + default_port: $default_port_expr, |
| 93 | + path: $path_expr.to_owned(), |
| 94 | + } |
| 95 | + )) |
| 96 | + }, |
| 97 | + SchemeData::NonRelative(ref scheme_data) => { |
| 98 | + quote_expr!(self, ::url::SchemeData::NonRelative($scheme_data.to_owned())) |
| 99 | + }, |
| 100 | + } |
| 101 | + } |
| 102 | + |
| 103 | + fn expr_option_string(&self, sp: Span, string: Option<String>) -> syntax::ptr::P<Expr> { |
| 104 | + match string { |
| 105 | + Some(string) => quote_expr!(self, Some($string.to_owned())), |
| 106 | + None => self.expr_none(sp), |
| 107 | + } |
| 108 | + } |
| 109 | + |
| 110 | + fn expr_option_u16(&self, sp: Span, unsigned: Option<u16>) -> syntax::ptr::P<Expr> { |
| 111 | + match unsigned { |
| 112 | + Some(unsigned) => quote_expr!(self, Some($unsigned)), |
| 113 | + None => self.expr_none(sp), |
| 114 | + } |
| 115 | + } |
| 116 | + |
| 117 | + fn expr_host(&self, sp: Span, host: Host) -> syntax::ptr::P<Expr> { |
| 118 | + match host { |
| 119 | + Host::Domain(domain) => quote_expr!(self, ::url::Host::Domain(String::from($domain))), |
| 120 | + Host::Ipv6(address) => { |
| 121 | + let pieces_expr = self.expr_slice_u16(sp, &address.pieces); |
| 122 | + quote_expr!(self, |
| 123 | + ::url::Host::Ipv6( |
| 124 | + ::url::Ipv6Address { |
| 125 | + pieces: $pieces_expr.to_owned() |
| 126 | + } |
| 127 | + )) |
| 128 | + }, |
| 129 | + } |
| 130 | + } |
| 131 | + |
| 132 | + fn expr_slice_u16(&self, sp: Span, unsigned: &[u16]) -> syntax::ptr::P<Expr> { |
| 133 | + let unsigned = unsigned.iter().map(|p| quote_expr!(self, $p)).collect(); |
| 134 | + self.expr_vec_slice(sp, unsigned) |
| 135 | + } |
| 136 | + |
| 137 | + fn expr_vec_string(&self, sp: Span, strings: Vec<String>) -> syntax::ptr::P<Expr> { |
| 138 | + let strings = strings.iter().map(|p| quote_expr!(self, $p.to_owned())).collect(); |
| 139 | + self.expr_vec(sp, strings) |
| 140 | + } |
| 141 | +} |
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