initial parser working

src/ast.rs

@@ -0,0 +1,69 @@
+// Grammar rules:
+//
+// Markdown     ::= Block Markdown | Block
+//
+// Block        ::= (Heading | CodeBlock | Quote | Paragraph) "\n\n"
+// Heading      ::= "#{1,6}\s" Inline
+// CodeBlock    ::= "```.*\n" "(.*?\n)*" "```"
+// Quote        ::= ">" Block
+// Paragraph    ::= Inline
+//
+// Inline       ::= InlineElem Inline | InlineElem
+// InlineElem   ::= Bold | Italic | Code | Link | Text
+// Bold         ::= "\*" Inline "\*"
+// Italic       ::= "_" Inline "_"
+// Code         ::= "`" "[.^`]*" "`"
+// Link         ::= "\[" Inline "\]\(" Href "\)"
+// Href         ::= "[.^\)]*"
+// Text         ::= "[.^`*_\[]*"
+
+#[derive(Debug, PartialEq)]
+pub enum Inline {
+    Bold { inner: Vec<Inline> },
+    Italic { inner: Vec<Inline> },
+    Link { inner: Vec<Inline>, href: Href },
+    Code { content: String },
+    Text { content: String },
+}
+
+#[derive(Debug, PartialEq)]
+pub struct Href(pub String);
+
+impl Href {
+    pub fn new(href: &str) -> Self {
+        // can check for link correctness
+        Self(href.to_string())
+    }
+}
+
+/*
+pub struct Markdown {
+    block: Block,
+    rest: Option<Box<Markdown>>,
+}
+
+pub enum Block {
+    Heading(HeadingBlock),
+    Code(CodeBlock),
+    Quote(QuoteBlock),
+    Paragraph(ParagraphBlock),
+}
+
+pub struct HeadingBlock {
+    level: u8,
+    content: Inline,
+}
+
+pub struct CodeBlock {
+    lang: String,
+    content: String,
+}
+
+pub struct QuoteBlock {
+    content: Box<Block>,
+}
+
+pub struct ParagraphBlock {
+    content: String,
+}
+*/