commit 4534d405daada4738e962be9ec5df0e10a60284a
Author: Shautvast <shautvast@gmail.com>
Date:   Mon Jan 6 22:02:47 2025 +0100

    first draft after day 1

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..2d50223
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,23 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "anyhow"
+version = "1.0.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34ac096ce696dc2fcabef30516bb13c0a68a11d30131d3df6f04711467681b04"
+
+[[package]]
+name = "unicode-segmentation"
+version = "1.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6ccf251212114b54433ec949fd6a7841275f9ada20dddd2f29e9ceea4501493"
+
+[[package]]
+name = "vis"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "unicode-segmentation",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ad436f1
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "vis"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = "1.0"
+unicode-segmentation = "1.1"
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..823c94f
--- /dev/null
+++ b/README.md
@@ -0,0 +1,64 @@
+Just started
+
+sample vis file:
+
+```
+markup {
+  lanes {
+    functions {
+      calc: "Calculation"
+      acc_interest_calc: "Account interest Calculation"
+      interest_rates: "Interest Rates"
+      config: "Configuration"
+      nob: "NoB" {
+        nob_execution: "NoB Execution"
+        coll_reinst_inst: "Collection of Reinstatement instructions"
+      }
+      reporting: "Reporting"
+    }
+    systems {
+      bank: "Bank" {
+        bank_motor: "Bank Motor"
+        bank_scripts: "Bank Scripts"
+        bank_client: "Bank Client"
+        bank_db: "Bank DB"
+      }
+      interest_engine: "InterestEngine"
+    }
+  }
+  bank-->calc
+  bank_scripts--<>bank_db
+  bank_motor--<>bank_db
+  interest_engine-->calc
+}
+
+styles {
+  lanes(group) {
+    type: textnode
+    orientation: horizontal
+    shape: rectangle
+    font-family: arial
+    border-width: 1px
+    border-color: gray
+  }
+  functions(group) {
+    background-color: yellow
+    font-family: arial
+    border-radius: 20px
+    border-width: 1px
+    border-color: gray
+  }
+  systems(group) {
+    background-color: lightblue
+  }
+  tag1: "⚭" { // how will this work?
+    right:0px
+    top:0px
+  }
+  tag2: {
+    itchy: scratchy
+  }
+}
+```
+
+Will have to be turned into an architecture diagram... we'll see how it goes!
diff --git a/src/cashpool.vis b/src/cashpool.vis
new file mode 100644
index 0000000..1887b45
--- /dev/null
+++ b/src/cashpool.vis
@@ -0,0 +1,56 @@
+markup {
+  lanes {
+    functions {
+      calc: "Calculation"
+      acc_interest_calc: "Account interest Calculation"
+      interest_rates: "Interest Rates"
+      config: "Configuration"
+      nob: "NoB" {
+        nob_execution: "NoB Execution"
+        coll_reinst_inst: "Collection of Reinstatement instructions"
+      }
+      reporting: "Reporting"
+    }
+    systems {
+      bank: "Bank" {
+        bank_motor: "Bank Motor"
+        bank_scripts: "Bank Scripts"
+        bank_client: "Bank Client"
+        bank_db: "Bank DB"
+      }
+      interest_engine: "InterestEngine"
+    }
+  }
+  bank-->calc
+  bank_scripts--<>bank_db
+  bank_motor--<>bank_db
+  interest_engine-->calc
+}
+
+styles {
+  lanes(group) {
+    type: textnode
+    orientation: horizontal
+    shape: rectangle
+    font-family: arial
+    border-width: 1px
+    border-color: gray
+  }
+  functions(group) {
+    background-color: yellow
+    font-family: arial
+    border-radius: 20px
+    border-width: 1px
+    border-color: gray
+  }
+  systems(group) {
+    background-color: lightblue
+  }
+  tag1: "⚭" { // how will this work?
+    right:0px
+    top:0px
+  }
+  tag2: {
+    itchy: scratchy
+  }
+}
diff --git a/src/grammar.txt b/src/grammar.txt
new file mode 100644
index 0000000..84820a0
--- /dev/null
+++ b/src/grammar.txt
@@ -0,0 +1,25 @@
+node: markup | styles
+markup: nodes
+elements: "{" element* "}"
+element: node | edge
+node: (id (":" title)? nodes?) | edgenode
+edge: idref arrow idref
+arrow: ArrowLeft | ArrowRight | DiamondArrowLeft | DiamondArrowRight
+ArrowLeft: "<--"
+ArrowRight: "-->"
+DiamondArrowLeft: "<>--"
+DiamondArrowRight: "--<>"
+id: text
+title: string
+string: """ text """
+
+
+styles: style*
+style: idref attributes? ":" style-elements
+style-elements: "{" style-element "}"
+style-element: key ":" value
+key: text
+value: text
+idref: text
+attributes: "(" attribute ")"
+attribute: text ("," attribute)*
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..0d86b24
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,32 @@
+use std::collections::HashMap;
+
+use tokens::TokenType;
+
+pub mod parser;
+mod scanner;
+mod tokens;
+
+#[derive(Debug)]
+pub struct Vis {
+    pub markup: Vec<Element>,
+    pub styles: Vec<StyleNode>,
+}
+
+#[derive(Debug)]
+pub enum Element {
+    Node(String, Option<String>, Vec<Element>),
+    Edge(String, String, TokenType, Option<String>),
+}
+
+#[derive(Debug)]
+pub struct StyleNode {
+    pub id_ref: String,
+    pub containertype: ContainerType,
+    pub attributes: HashMap<String, String>,
+}
+
+#[derive(Debug)]
+pub enum ContainerType {
+    Node,
+    Group,
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..70be723
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,41 @@
+use anyhow::anyhow;
+use std::env::args;
+use std::fs;
+
+fn main() -> anyhow::Result<()> {
+    let args: Vec<String> = args().collect();
+    if args.len() != 2 {
+        return Err(anyhow!("Usage: vis vis-file"));
+    } else {
+        let vis_file = read_file(&args[1])?;
+        let vis = vis::parser::parse_vis(vis_file.as_str())?;
+        println!("{:?}", vis);
+    }
+
+    Ok(())
+}
+
+fn read_file(file_name: &str) -> anyhow::Result<String> {
+    fs::read_to_string(file_name).map_err(|e| anyhow!("Cannot read file '{}': {}", file_name, e))
+}
+
+//frankensteinwoorden:
+//loopbaanrecord
+//vriendendienstplicht
+//brandweerbericht
+//antiloopgraaf
+//blikveldslag
+//zeurpietenhuis
+//krentenbroodmager
+//opzijweg
+//doorstroomversnelling
+//koektrommelvlies
+//draaideuropening
+//luchtsteuntrekker
+//boekhoudhakker
+//krantenkopstoot
+//prijzenoorlogsverslaggeving
+//dwaallichtknop
+//slaapwandeltocht
+//rampspoedafdeling
+//
diff --git a/src/parser.rs b/src/parser.rs
new file mode 100644
index 0000000..60a9fa2
--- /dev/null
+++ b/src/parser.rs
@@ -0,0 +1,163 @@
+use crate::{
+    tokens::{
+        Token,
+        TokenType::{self, *},
+    },
+    Element, StyleNode, Vis,
+};
+use anyhow::anyhow;
+
+pub fn parse_vis(contents: &str) -> anyhow::Result<Vis> {
+    let tokens = crate::scanner::scan(contents)?;
+    println!("{:?}", tokens);
+    let mut parser = Parser::new(tokens);
+
+    Ok(Vis {
+        markup: parser.markup()?,
+        styles: parser.styles()?,
+    })
+}
+
+struct Parser {
+    tokens: Vec<Token>,
+    current: usize,
+}
+
+impl Parser {
+    pub fn new(tokens: Vec<Token>) -> Self {
+        Self { tokens, current: 0 }
+    }
+
+    fn markup(&mut self) -> anyhow::Result<Vec<Element>> {
+        if self.match_token(Markup) {
+            self.nodes()
+        } else {
+            Ok(vec![])
+        }
+    }
+
+    fn nodes(&mut self) -> anyhow::Result<Vec<Element>> {
+        println!("nodes {:?}", self.peek());
+        self.consume(LeftBrace, "Expected '{'")?;
+        let mut nodes = vec![];
+        while !self.match_token(RightBrace) {
+            nodes.push(self.node()?);
+        }
+        Ok(nodes)
+    }
+
+    fn node(&mut self) -> anyhow::Result<Element> {
+        println!("node {:?}", self.peek());
+        let id = self.id()?;
+        println!("id {}", id);
+        let current = self.peek().clone();
+        if self.match_tokens(vec![
+            ArrowRight,
+            ArrowLeft,
+            DiamondArrowRight,
+            DiamondArrowLeft,
+        ]) {
+            self.edge(id, current)
+        } else {
+            let title = self.title()?;
+            println!("title {:?}", title);
+            let children = if self.check(&LeftBrace) {
+                self.nodes()?
+            } else {
+                vec![]
+            };
+
+            Ok(Element::Node(id, title, children))
+        }
+    }
+
+    fn edge(&mut self, from_id: String, arrow: Token) -> anyhow::Result<Element> {
+        let to_id = self.id()?;
+        let title = self.title()?;
+        Ok(Element::Edge(from_id, to_id, arrow.tokentype, title))
+    }
+
+    fn title(&mut self) -> anyhow::Result<Option<String>> {
+        if self.check(&Colon) {
+            self.advance();
+            Ok(Some(self.string()?))
+        } else {
+            Ok(None)
+        }
+    }
+
+    fn id(&mut self) -> anyhow::Result<String> {
+        self.text()
+    }
+
+    fn string(&mut self) -> anyhow::Result<String> {
+        let text = self.peek().clone();
+        self.consume(Str, "Expected quoted string")?;
+        Ok(text.lexeme.to_owned())
+    }
+
+    fn text(&mut self) -> anyhow::Result<String> {
+        let text = self.peek().clone();
+        self.consume(Identifier, "Expected text")?;
+        Ok(text.lexeme.to_owned())
+    }
+
+    fn styles(&mut self) -> anyhow::Result<Vec<StyleNode>> {
+        Ok(vec![])
+    }
+
+    fn consume(&mut self, tokentype: TokenType, expect: &str) -> anyhow::Result<&Token> {
+        let current = self.peek();
+        if self.check(&tokentype) {
+            Ok(self.advance())
+        } else {
+            Err(anyhow!("Error: {} on line {}", expect, current.line))
+        }
+    }
+
+    fn match_tokens(&mut self, tokentypes: Vec<TokenType>) -> bool {
+        for tokentype in tokentypes.iter() {
+            if self.check(tokentype) {
+                self.advance();
+                return true;
+            }
+        }
+        false
+    }
+
+    fn match_token(&mut self, tokentype: TokenType) -> bool {
+        if self.check(&tokentype) {
+            self.advance();
+            true
+        } else {
+            false
+        }
+    }
+
+    fn check(&self, tokentype: &TokenType) -> bool {
+        if self.is_at_end() {
+            false
+        } else {
+            &self.peek().tokentype == tokentype
+        }
+    }
+
+    fn advance(&mut self) -> &Token {
+        if !self.is_at_end() {
+            self.current += 1;
+        }
+        self.previous()
+    }
+
+    fn previous(&self) -> &Token {
+        &self.tokens[self.current - 1]
+    }
+
+    fn is_at_end(&self) -> bool {
+        self.peek().tokentype == TokenType::Eof
+    }
+
+    fn peek(&self) -> &Token {
+        &self.tokens[self.current]
+    }
+}
diff --git a/src/scanner.rs b/src/scanner.rs
new file mode 100644
index 0000000..f3ac5a6
--- /dev/null
+++ b/src/scanner.rs
@@ -0,0 +1,209 @@
+use unicode_segmentation::UnicodeSegmentation;
+
+use crate::tokens::{
+    Token,
+    TokenType::{self, *},
+    KEYWORDS,
+};
+
+pub fn scan(vis: &str) -> anyhow::Result<Vec<Token>> {
+    let mut scanner = Scanner::new(vis);
+    scanner.scan();
+    Ok(scanner.tokens)
+}
+
+struct Scanner<'a> {
+    tokens: Vec<Token>,
+    chars: Vec<&'a str>,
+    current_pos: usize,
+    current_line: usize,
+    start_pos: usize,
+}
+impl<'a> Scanner<'a> {
+    fn new(vis: &'a str) -> Self {
+        Self {
+            tokens: vec![],
+            chars: UnicodeSegmentation::graphemes(vis, true).collect::<Vec<&str>>(),
+            current_pos: 0,
+            current_line: 0,
+            start_pos: 0,
+        }
+    }
+
+    fn scan(&mut self) {
+        while !self.is_at_end() {
+            self.start_pos = self.current_pos;
+            self.scan_token();
+        }
+        self.add_token(Eof);
+    }
+
+    fn scan_token(&mut self) {
+        let c = self.advance();
+        match c {
+            "(" => self.add_token(LeftParen),
+            ")" => self.add_token(RightParen),
+            "{" => self.add_token(LeftBrace),
+            "}" => self.add_token(RightBrace),
+            "," => self.add_token(Comma),
+            "." => self.add_token(Dot),
+
+            "-" => {
+                if self.match_token("-") {
+                    if self.match_token(">") {
+                        self.add_token(ArrowRight);
+                    } else if self.match_token("<") {
+                        if self.match_token(">") {
+                            self.add_token(DiamondArrowRight);
+                        } else {
+                            println!("Wrong arrow at {}", self.current_line);
+                        }
+                    } else {
+                        println!("Wrong arrow at {}", self.current_line);
+                    }
+                } else {
+                    self.add_token(Minus);
+                }
+            }
+            "<" => {
+                if self.match_token("-") {
+                    if self.match_token("-") {
+                        self.add_token(ArrowLeft);
+                    } else {
+                        println!("Wrong arrow at {}", self.current_line);
+                    }
+                } else if self.match_token(">") {
+                    if self.match_token("-") {
+                        if self.match_token("-") {
+                            self.add_token(DiamondArrowLeft);
+                        } else {
+                            println!("Wrong arrow at {}", self.current_line);
+                        }
+                    } else {
+                        println!("Wrong arrow at {}", self.current_line);
+                    }
+                }
+            }
+            ":" => self.add_token(Colon),
+            "/" => {
+                if self.match_token("/") {
+                    while self.peek() != "\n" && !self.is_at_end() {
+                        self.advance();
+                    }
+                } else {
+                    self.add_token(Slash);
+                }
+            }
+            " " | "\t" | "\r" => {}
+            "\n" => {
+                self.current_line += 1;
+            }
+            "\"" => self.string(),
+            _ => {
+                if is_digit(c) || c == "." {
+                    self.number()
+                } else if is_alpha(c) {
+                    self.identifier()
+                }
+            }
+        }
+    }
+
+    fn peek(&self) -> &str {
+        if self.current_pos < self.chars.len() {
+            self.chars[self.current_pos]
+        } else {
+            ""
+        }
+    }
+
+    fn peek_next(&self) -> &str {
+        self.chars[self.current_pos + 1]
+    }
+
+    fn identifier(&mut self) {
+        while is_alpha(self.peek()) || is_digit(self.peek()) {
+            self.advance();
+        }
+        let text = self.chars[self.start_pos..self.current_pos].concat();
+        let tokentype = KEYWORDS
+            .get(text.as_str())
+            .map(|d| *d)
+            .unwrap_or(Identifier);
+
+        self.add_token(tokentype);
+    }
+
+    fn number(&mut self) {
+        while is_digit(self.peek()) || (self.peek() == "." && is_digit(self.peek_next())) {
+            self.advance();
+        }
+
+        self.add_token(TokenType::Number);
+    }
+
+    fn string(&mut self) {
+        while self.peek() != "\"" && !self.is_at_end() {
+            if self.peek() == "\n" {
+                self.current_line = 1;
+            }
+            self.advance();
+        }
+
+        if self.is_at_end() {
+            println!("Unterminated string");
+            return;
+        }
+
+        self.advance();
+
+        self.add_token(TokenType::Str);
+    }
+
+    fn add_token(&mut self, tokentype: TokenType) {
+        // println!("add token {:?}", tokentype);
+        let token = Token::new(
+            tokentype,
+            self.chars[self.start_pos..self.current_pos].concat(),
+            self.current_line,
+        );
+        self.tokens.push(token);
+    }
+
+    fn match_token(&mut self, expected: &str) -> bool {
+        if self.is_at_end() || self.peek() != expected {
+            return false;
+        }
+        self.current_pos += 1;
+        return true;
+    }
+
+    fn advance(&mut self) -> &str {
+        let c = self.chars[self.current_pos];
+        if self.current_pos < self.chars.len() {
+            self.current_pos += 1;
+        }
+        c
+    }
+
+    fn is_at_end(&self) -> bool {
+        self.current_pos >= self.chars.len()
+    }
+}
+
+fn is_digit(char: &str) -> bool {
+    char.len() > 0 && char.chars().next().unwrap().is_ascii_digit()
+}
+
+fn is_alpha(char: &str) -> bool {
+    if char.len() == 0 {
+        false
+    } else {
+        let char = char.chars().next().unwrap();
+        if char.is_alphabetic() || char == '_' {
+            true
+        } else {
+            false
+        }
+    }
+}
diff --git a/src/tokens.rs b/src/tokens.rs
new file mode 100644
index 0000000..41f436b
--- /dev/null
+++ b/src/tokens.rs
@@ -0,0 +1,54 @@
+use std::cell::LazyCell;
+use std::collections::HashMap;
+use TokenType::*;
+
+pub const KEYWORDS: LazyCell<HashMap<&str, TokenType>> = LazyCell::new(|| {
+    let mut m = HashMap::new();
+    m.insert("markup", Markup);
+    m.insert("styles", Styles);
+    m.insert("group", Group);
+    m.insert("px", Px);
+    m
+});
+
+#[derive(Debug, Clone)]
+pub struct Token {
+    pub tokentype: TokenType,
+    pub lexeme: String,
+    pub line: usize,
+}
+
+impl Token {
+    pub(crate) fn new(tokentype: TokenType, lexeme: String, line: usize) -> Self {
+        Token {
+            tokentype,
+            lexeme,
+            line,
+        }
+    }
+}
+
+#[derive(Debug, PartialEq, Eq, Clone, Copy)]
+pub enum TokenType {
+    ArrowRight,
+    ArrowLeft,
+    DiamondArrowRight,
+    DiamondArrowLeft,
+    LeftParen,
+    RightParen,
+    LeftBrace,
+    RightBrace,
+    Comma,
+    Dot,
+    Colon,
+    Slash,
+    Identifier,
+    Str,
+    Number,
+    Minus,
+    Markup,
+    Styles,
+    Group,
+    Eof,
+    Px,
+}