commit be905787071a7466bf02cbfa69d641630607ea20 Author: trisua Date: Fri May 30 20:29:49 2025 -0400 Initial diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 100644 index 0000000..d075642 --- /dev/null +++ b/Cargo.lock @@ -0,0 +1,7 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +version = 4 + +[[package]] +name = "bberry" +version = "0.1.0" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..511b829 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,4 @@ +[package] +name = "bberry" +version = "0.1.0" +edition = "2024" diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..0ad25db --- /dev/null +++ b/LICENSE @@ -0,0 +1,661 @@ + GNU AFFERO GENERAL PUBLIC LICENSE + Version 3, 19 November 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU Affero General Public License is a free, copyleft license for +software and other kinds of works, specifically designed to ensure +cooperation with the community in the case of network server software. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published + by the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +solutions will be better for different programs; see section 13 for the +specific requirements. + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU AGPL, see +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..8389c89 --- /dev/null +++ b/README.md @@ -0,0 +1,54 @@ +# 🫐 bberry + +Super simple parser and "compiler" for turning a lisp-like DSL into HTML. + +Here's a small example: + +```lisp +('"") ; using a raw string for the doctype is fine +(html + (head + ; everything that belongs in the head element + (title'"Document") + + (meta (: "charset" "UTF-8")) + (meta (: "name" "viewport") (: "content" "width=device-width, initial-scale=1.0")) + (meta (: "http-equiv" "X-UA-Compatible") (: "content" "ie=edge")) + + (link (: "rel" "stylesheet") (: "href" "#"))) + + (body + ; the actual body only starts here + (span (: "style" "color: red") ('"Hello, world!")))) +``` + +This yields: + +```html + + + + + Document + + + + + + + Hello, world! + + +``` + +# Syntax + +bberry has some super simple syntax helpers: + +- You can create raw HTML elements using `(text "...")` or `(' "...")` +- You can add attributes using `(attr "key" "value")` or `(: "key" "value")` +- You can quickly add text to an element by adding an apostrophe at the end of its tag (if it has no children) like `(h1'"Hello, world!")` + +# License + +bberry is licensed under the [AGPL-3.0](./LICENSE). diff --git a/examples/boilerplate.lisp b/examples/boilerplate.lisp new file mode 100644 index 0000000..0957d98 --- /dev/null +++ b/examples/boilerplate.lisp @@ -0,0 +1,15 @@ +('"") ; using a raw string for the doctype is fine +(html + (head + ; everything that belongs in the head element + (title'"Document") + + (meta (: "charset" "UTF-8")) + (meta (: "name" "viewport") (: "content" "width=device-width, initial-scale=1.0")) + (meta (: "http-equiv" "X-UA-Compatible") (: "content" "ie=edge")) + + (link (: "rel" "stylesheet") (: "href" "#"))) + + (body + ; the actual body only starts here + (span (: "style" "color: red") ('"Hello, world!")))) diff --git a/src/core/element.rs b/src/core/element.rs new file mode 100644 index 0000000..a9f45eb --- /dev/null +++ b/src/core/element.rs @@ -0,0 +1,74 @@ +use std::collections::HashMap; + +pub trait Render { + /// Render into HTML. + fn render(&self) -> String; +} + +pub const SELF_CLOSING_TAGS: &[&str] = &["img", "br", "hr", "input", "meta", "link"]; + +/// The entire document can be boiled down to just elements with children... so just +/// a simple tree structure (just without the linking to parent since that's annoying) +#[derive(Clone, Debug, Default)] +pub struct Element { + pub tag: String, + pub attrs: HashMap, + pub children: Vec, +} + +impl Render for Element { + fn render(&self) -> String { + if self.tag == "text" { + return self.attrs.get("content").unwrap().to_owned(); + } else if self.tag == "v" { + return self.attrs.get("0").unwrap().to_owned(); + } else if self.tag == "null?" { + // just render children of null element + let mut inner: String = String::new(); + + for element in &self.children { + inner.push_str(&element.render()); + } + + return inner; + } + + let closing = format!("", self.tag); + format!( + "<{}{}{}{}{}", + self.tag, + { + let mut attrs: String = String::new(); + + for attr in &self.attrs { + attrs.push_str(" "); + attrs.push_str(attr.0); + attrs.push_str("=\""); + attrs.push_str(attr.1); + attrs.push_str("\""); + } + + attrs + }, + if SELF_CLOSING_TAGS.contains(&self.tag.as_str()) { + "/>" + } else { + ">" + }, + { + let mut inner: String = String::new(); + + for element in &self.children { + inner.push_str(&element.render()); + } + + inner + }, + if SELF_CLOSING_TAGS.contains(&self.tag.as_str()) { + "" + } else { + &closing + } + ) + } +} diff --git a/src/core/mod.rs b/src/core/mod.rs new file mode 100644 index 0000000..12368c3 --- /dev/null +++ b/src/core/mod.rs @@ -0,0 +1,2 @@ +pub mod element; +pub mod parser; diff --git a/src/core/parser.rs b/src/core/parser.rs new file mode 100644 index 0000000..4384e02 --- /dev/null +++ b/src/core/parser.rs @@ -0,0 +1,272 @@ +use super::element::Element; + +/// Parse a string input. Modifies the given `buffer` IN PLACE. +pub fn string_parser(buf: impl Iterator, buffer: &mut String) { + let mut is_parsing_string: bool = false; + let mut escape: bool = false; + + for char in buf { + // string parser + if is_parsing_string { + if escape { + buffer.push(char); + escape = false; + continue; + } + + if char == '\\' { + escape = true; + continue; + } else if char == '"' { + break; + } + + buffer.push(char); + } else if char == ' ' { + continue; + } + + if char == '"' { + // start string parser + is_parsing_string = true; + } + } +} + +/// Parse an attribute block. +/// +/// # Returns +/// `(key, value)` +/// +/// # Example +/// +/// ```rust +/// attr_parser("(attr \"a\" \"b\")"); +/// ``` +pub fn attr_parser(buf: &str) -> (String, String) { + let mut key: String = String::new(); + let mut value: String = String::new(); + let mut buffer: String = String::new(); + let mut finished_key: bool = false; + + for _ in 0..2 { + string_parser( + if finished_key { + // skip quote + key + quote chars to get to AFTER the first string + buf.chars().skip(key.len() + 2) + } else { + // we haven't done the key yet, so let's just select from the start + buf.chars().skip(0) + }, + &mut buffer, + ); + + // at this point, `buffer` should contain a string since `string_parser` is blocking + // until it fully parses a string + if finished_key { + value = buffer.clone(); + } else { + key = buffer.clone(); + finished_key = true; + } + + buffer.clear(); + } + + (key, value) +} + +/// A parser for parsing an element expression. The element parser **only** parsers +/// element statements (stuff in parenthesis). +pub fn expr_parser(buf: &str) -> Element { + let mut element: Element = Element::default(); + + // state + let mut skip_for: usize = 0; + let mut finished_parsing_tag: bool = false; + + for (i, char) in buf.chars().enumerate() { + if skip_for > 0 { + // skip char + skip_for -= 1; + continue; + } + + // parse tag first as it is the first thing + if !finished_parsing_tag { + if (char == ' ') | (char == '\n') { + finished_parsing_tag = true; + continue; + } + + if char != '(' { + element.tag.push(char); + } + + continue; + } + + // special elements + if element.tag == "#" { + // parse as tuple + // tuples can only contain strings + let len = buf.matches("s\"").collect::>().len(); + let mut values: Vec = Vec::new(); + let mut last_len: usize = 0; + + for _ in 0..len { + let mut buffer: String = String::new(); + + string_parser( + buf.replace("# ", "") + .replace("s\"", "\"") + .chars() + .skip(last_len), + &mut buffer, + ); + last_len = buffer.len() + 2; + + values.push(buffer); + } + + for (i, v) in values.iter().enumerate() { + element.attrs.insert(i.to_string(), v.to_owned()); + } + + return element; + } else if (element.tag == "attr") | (element.tag == ":") { + let (k, v) = attr_parser(&buf[i..buf.len()]); + element.attrs.insert(k, v); + element.tag = "attr".to_string(); + return element; + } else if (element.tag == "text") | (element.tag.ends_with("'")) { + let mut buffer: String = String::new(); + + string_parser((&buf[i..buf.len()]).chars(), &mut buffer); + if (element.tag != "text") && (element.tag != "'") { + // allows us to write `(h1' "Hello, world!")` instead of `(h1 [(text "Hello, world!")])` + element.tag = element.tag.replace("'", ""); + + let mut text_element = Element::default(); + text_element.tag = "text".to_string(); + text_element.attrs.insert("content".to_string(), buffer); + + element.children.push(text_element); + } else { + // just add attr + if element.tag == "'" { + element.tag = "text".to_string(); + } + + element.attrs.insert("content".to_string(), buffer); + } + + return element; + } + + // everything else + if char == '(' { + // parse from here to the end (including the paren) + let (element_, used) = element_parser(&buf[i..buf.len()]); + skip_for = used; + + if element_.tag == "attr" { + // element just holds attributes... merge with list + for attr in element_.attrs { + element.attrs.insert(attr.0, attr.1); + } + } else { + // element is a child + element.children.push(element_); + } + } + } + + // ... + element +} + +/// Parse a single element. +/// +/// # Returns +/// `(element, number of characters consumed)` +pub fn element_parser(value: &str) -> (Element, usize) { + let mut element: Element = Element::default(); + let mut consumed: usize = 0; + + // parser state + let mut scope: i32 = 0; // the scope tells us when we can stop parsing junk... + // basically, we stop parsing junk when the scope reaches the same scope we started + // with when we began parsing junk + let mut return_to_scope: i32 = 0; + + let mut buffer: String = String::new(); + let mut building_buffer_so_ignore_junk: bool = false; + let mut comment: bool = false; + + for char in value.chars() { + if comment { + if char == '\n' { + comment = false; + } + + continue; + } + + if building_buffer_so_ignore_junk { + // everything here can be assumed to be junk to be parsed later + if char == ')' { + // if we're back at the scope we started when we first opened the block, + // don't stop parsing as junk + scope -= 1; + if scope == return_to_scope { + // building_buffer_so_ignore_junk = false; + + // parse actual stuff + consumed += buffer.len(); + element = expr_parser(&buffer); + + // reset the buffer and return first element IMMEDIATELY + // this allows expr_parser to continue parsing the next + // expression by skipping how many characters we parsed here + buffer.clear(); + return (element, consumed); + } else { + buffer.push(char); + } + } else { + if char == '(' { + scope += 1; + } + + buffer.push(char); + } + + continue; + } + + // everything here happens ONLY IF we aren't parsing any junk yet + if char == ' ' { + continue; + } + + if char == '(' { + // tell the parser that we're building a buffer to recursively parse, + // so everything can currently be ignored + scope += 1; + + if !building_buffer_so_ignore_junk { + return_to_scope = scope - 1; + building_buffer_so_ignore_junk = true; + } + } + } + + // ... + (element, consumed) +} + +/// Parse a full document. +pub fn document(value: &str) -> (Element, usize) { + element_parser(&format!("(null? [{value}])")) +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..9300be0 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,2 @@ +pub mod core; +pub use core::parser::document as parse;