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// Tagua VM // // // New BSD License // // Copyright © 2016-2016, Ivan Enderlin. // All rights reserved. // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are met: // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above copyright // notice, this list of conditions and the following disclaimer in the // documentation and/or other materials provided with the distribution. // * Neither the name of the Hoa nor the names of its contributors may be // used to endorse or promote products derived from this software without // specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS AND CONTRIBUTORS BE // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGE. //! Structures that will constitute the Abstract Syntax Tree. /// A term. #[derive(Debug, PartialEq)] pub struct Term { /// The term value. pub t: Literal } /// An addition of two terms. #[derive(Debug, PartialEq)] pub struct Addition { /// The left-hand side of the addition. pub a: Term, /// The right-hand side of the addition. pub b: Term } /// A literal represents a fixed value, aka an atom. #[derive(Debug, PartialEq)] pub enum Literal { /// A null value. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Literal; /// use tagua_parser::rules::literals::literal; /// /// # fn main () { /// assert_eq!(literal(b"null"), Result::Done(&b""[..], Literal::Null)); /// # } /// ``` Null, /// A boolean, either `true` or `false`. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Literal; /// use tagua_parser::rules::literals::literal; /// /// # fn main () { /// assert_eq!(literal(b"true"), Result::Done(&b""[..], Literal::Boolean(true))); /// assert_eq!(literal(b"false"), Result::Done(&b""[..], Literal::Boolean(false))); /// # } /// ``` Boolean(bool), /// An integer, for instance a binary, octal, decimal or hexadecimal number. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Literal; /// use tagua_parser::rules::literals::literal; /// /// # fn main () { /// let output = Result::Done(&b""[..], Literal::Integer(42i64)); /// /// assert_eq!(literal(b"0b101010"), output); /// assert_eq!(literal(b"052"), output); /// assert_eq!(literal(b"42"), output); /// assert_eq!(literal(b"0x2a"), output); /// # } /// ``` Integer(i64), /// A real, for instance an exponential number. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Literal; /// use tagua_parser::rules::literals::literal; /// /// # fn main () { /// let output = Result::Done(&b""[..], Literal::Real(4.2f64)); /// /// assert_eq!(literal(b"4.2"), output); /// assert_eq!(literal(b".42e1"), output); /// assert_eq!(literal(b"420e-2"), output); /// # } /// ``` Real(f64), /// A string. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Literal; /// use tagua_parser::rules::literals::literal; /// /// # fn main () { /// assert_eq!( /// literal(b"'foo\\'bar'"), /// Result::Done(&b""[..], Literal::String(b"foo'bar".to_vec())) /// ); /// # } /// ``` String(Vec<u8>) } /// A variable. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Variable; /// use tagua_parser::rules::tokens::variable; /// /// # fn main () { /// assert_eq!( /// variable(b"$foo"), /// Result::Done(&b""[..], Variable(&b"foo"[..])) /// ); /// # } /// ``` /// Note that the `$` is not present. #[derive(Debug, PartialEq)] pub struct Variable<'a>(pub &'a [u8]); /// A name represents an entity name. #[derive(Debug, PartialEq)] pub enum Name<'a> { /// An unqualified name, i.e. a name without a namespace, like `Bar`. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Name; /// use tagua_parser::rules::tokens::qualified_name; /// /// # fn main () { /// assert_eq!( /// qualified_name(b"Bar"), /// Result::Done(&b""[..], Name::Unqualified(&b"Bar"[..])) /// ); /// # } /// ``` Unqualified(&'a [u8]), /// A qualified name, i.e. a name in a relative namespace (aliased or not), /// like `Foo\Bar`. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Name; /// use tagua_parser::rules::tokens::qualified_name; /// /// # fn main () { /// assert_eq!( /// qualified_name(b"Foo\\Bar"), /// Result::Done(&b""[..], Name::Qualified(vec![&b"Foo"[..], &b"Bar"[..]])) /// ); /// # } /// ``` Qualified(Vec<&'a [u8]>), /// A relative qualified name, i.e. a name in a relative namespace /// restricted to the current namespace, like `namespace\Foo\Bar`. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Name; /// use tagua_parser::rules::tokens::qualified_name; /// /// # fn main () { /// assert_eq!( /// qualified_name(b"namespace\\Foo\\Bar"), /// Result::Done(&b""[..], Name::RelativeQualified(vec![&b"Foo"[..], &b"Bar"[..]])) /// ); /// # } /// ``` /// Note that the `namespace` part is not present. RelativeQualified(Vec<&'a [u8]>), /// A fully qualified name, i.e. a name in an absolute namespace, like /// `\Foo\Bar`. /// /// # Examples /// /// ``` /// # extern crate tagua_parser; /// use tagua_parser::Result; /// use tagua_parser::ast::Name; /// use tagua_parser::rules::tokens::qualified_name; /// /// # fn main () { /// assert_eq!( /// qualified_name(b"\\Foo\\Bar"), /// Result::Done(&b""[..], Name::FullyQualified(vec![&b"Foo"[..], &b"Bar"[..]])) /// ); /// # } /// ``` /// Note that the leading `\` part is not present. FullyQualified(Vec<&'a [u8]>) }