Initial commit

1 files changed, 124 insertions, 0 deletions

diff --git a/src/parser.rs b/src/parser.rs
new file mode 100644
index 0000000..c57fe14
--- /dev/null
+++ b/src/parser.rs
@@ -0,0 +1,124 @@
+use crate::journal::Journal;
+
+use std::fs;
+use std::iter::Peekable;
+
+extern crate itertools;
+extern crate time;
+
+use itertools::Itertools;
+use time::Date;
+
+
+#[derive(Debug, Eq, PartialEq, Clone)]
+pub enum Token {
+    Word(String),
+    DateSep,
+    AccountSep,
+    DecimalSep,
+    Newline,
+    Space,
+    Indent,
+    Marker(char),
+    Comment(char),
+    Numeric(String),
+}
+
+pub struct Lexer<I: Iterator<Item=char>> {
+    iter: Peekable<I>
+}
+
+impl<I: Iterator<Item=char>> Lexer<I> {
+    pub fn new(iter: I) -> Lexer<I> {
+        Lexer {
+            iter: iter.peekable()
+        }
+    }
+}
+
+impl<I: Iterator<Item=char>> Iterator for Lexer<I> {
+    type Item = Token;
+
+    fn next(&mut self) -> Option<Token> {
+        // let ch = *self.iter.peek().unwrap_or(&'`');
+        let ch = self.iter.peek()
+        match ch {
+            /* alphanumeric */
+            c if c.is_alphabetic() => {
+                Some(Token::Word(self.iter.by_ref()
+                        .peeking_take_while(|&c| c.is_alphabetic()).collect())) },
+            c if c.is_numeric() => {
+                Some(Token::Numeric(self.iter.by_ref()
+                        .peeking_take_while(|&c| c.is_numeric()).collect()))
+            },
+            /* whitespace */
+            ' ' => {
+                self.iter.next();
+                Some(Token::Space)
+            },
+            '\n' => {
+                self.iter.next();
+                Some(Token::Newline)
+            },
+            '\t' => {
+                self.iter.next();
+                Some(Token::Indent)
+            },
+            /* separators */
+            '/' => {
+                self.iter.next();
+                Some(Token::DateSep)
+            },
+            ':' => {
+                self.iter.next();
+                Some(Token::AccountSep)
+            },
+            ',' | '.' => {
+                self.iter.next();
+                Some(Token::DecimalSep)
+            },
+            /* comments */
+            ';' | '#' | '%' => {
+                self.iter.next();
+                Some(Token::Comment(ch))
+            },
+            /* markers */
+            '*' | '!' | '@' | '-' => {
+                self.iter.next();
+                Some(Token::Marker(ch))
+            },
+            '`' => {
+                println!("--");
+                None
+            },
+            _ => self.next(),
+        }
+    }
+}
+
+
+pub fn lex(text: &str) -> Vec<Token> {
+    Lexer::new(text.chars()).collect()
+}
+
+
+
+struct Parser {
+
+}
+
+pub fn parse(name: &str) -> Journal {
+    let text = fs::read_to_string(name).expect("Cannot open file");
+
+    println!("{:?}", text);
+
+    for token in lex(&text) {
+        println!("{:?}", token);
+    }
+
+    Journal {
+        accounts: vec![],
+        commodities: vec![],
+        transactions: vec![],
+    }
+}