src/main.rs

@@ -1,9 +1,4 @@
 use std::fs::File;
-use std::collections::BTreeMap;
-use chrono::prelude::*;
-use ::function_name::named;
-
-use num::*;
 use clap::Parser;
 
 pub mod vcd;
@@ -15,74 +10,27 @@ struct Cli {
     #[clap(parse(from_os_str))]
     path: std::path::PathBuf}
 
-#[derive(Debug)]
-struct Version(String);
-
-#[derive(Debug)]
-enum Timescale {ps, ns, us, ms, s, unit}
-
-#[derive(Debug)]
-struct Metadata {
-    date      : Option<DateTime<Utc>>,
-    version   : Option<Version>,
-    timescale : (Option<u32>, Timescale)}
-
-#[derive(Debug)]
-struct Scope_Idx(usize);
-
-#[derive(Debug)]
-struct Signal_Idx(usize);
-
-#[derive(Debug)]
-enum SignalGeneric{
-    Signal{
-        name           : String,
-        timeline       : BTreeMap<BigInt, BigInt>,
-        scope_parent   : Scope_Idx},
-    SignalAlias{
-        name          : String,
-        signal_alias  : Signal_Idx}
-}
-
-#[derive(Debug)]
-struct Scope {
-    name          : String,
-    child_signals : Vec<Signal_Idx>,
-    child_scopes  : Vec<Scope_Idx>}
-
-
-#[derive(Debug)]
-struct VCD {
-    metadata    : Metadata,
-    all_signals : Vec<SignalGeneric>,
-    // the root scope should always be placed at index 0
-    all_scopes  : Vec<Scope>}
-
-impl VCD {
-    pub fn new() -> Self {
-        let metadata = Metadata {
-            date      : None,
-            version   : None,
-            timescale : (None, Timescale::unit)};
-        VCD {
-            metadata    : metadata,
-            all_signals : Vec::<SignalGeneric>::new(),
-            all_scopes  : Vec::<Scope>::new()}
-        }
-    }
-
-
 fn main() -> std::io::Result<()> {
     let args = Cli::parse();
 
     let file           = File::open(&args.path)?;
-    let mut word_gen   = WordReader::new(file);
-    let mut word_count = 0;
+    dbg!(["hello", "goodbye", "myworld"].contains(&"myworlde"));
+    // let mut word_gen   = WordReader::new(file);
+    // let mut word_count = 0;
+
+    // while word_gen.next_word().is_some() {
+    //     word_count += 1;
+    // }
+    // dbg!(word_count);
+
+    // let word1 = "hello world";
+    // let word2 = "hello planet";
+    // dbg!(&word1[0..6].len());
+    dbg!(take_until("tea time  now: and later", b':'));
+    // parse_vcd(file);
+
+    // tag("my oh my");
 
-    while word_gen.next_word().is_some() {
-        word_count += 1;
-    }
-    dbg!(word_count);
 
     // loop {
     //     let word = word_gen.next_word();

src/vcd.rs

@@ -1,2 +1,8 @@
 mod reader;
 pub use reader::*;
+
+mod types;
+pub use types::*;
+
+mod parse;
+pub use parse::*;

src/vcd/parse.rs

@@ -0,0 +1,188 @@
+use super::*;
+use std::fs::File;
+use ::function_name::named;
+
+#[derive(Debug)]
+pub struct Residual<'a>(&'a str);
+
+pub fn take_until<'a>(word : &'a str, pattern : u8) -> Option<(&'a str, Residual)> {
+    let mut new_start  = 0;
+
+    for chr in word.as_bytes() {
+        if (*chr == pattern) {
+            return Some((&word[0..new_start], Residual(&word[new_start..])));
+        } 
+        else {
+            new_start += 1;
+        }
+    }
+
+    None
+}
+
+fn tag<'a>(word : &'a str, pattern : &'a str) -> Option<&'a str> {
+    let lhs           = word.as_bytes().iter();
+    let rhs           = pattern.as_bytes();
+    let iter          = lhs.zip(rhs);
+    let mut new_start = 0;
+
+    let mut res = true;
+    for (c_lhs, c_rhs) in iter {
+        res = res && (c_lhs == c_rhs);
+        if !res {return None}
+        new_start += 1;
+    }
+
+    Some(&word[new_start..])
+}
+
+#[named]
+fn parse_date(word_reader : &mut WordReader) -> Result<(), String> {
+    let mut parsed_day   = false;
+    let mut parsed_month = false;
+    let mut parsed_date  = false;
+    let mut parsed_hh    = false;
+    let mut parsed_mm    = false;
+    let mut parsed_ss    = false;
+    let mut parsed_year  = false;
+    let mut parsed_end   = false;
+
+    let day = {
+        // check for another word in the file
+        let (word, cursor) = word_reader.next_word().expect(
+            format!("reached end of file without parser leaving {}", function_name!()).as_str()
+        );
+    
+        let days = ["Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"];
+        if !days.contains(&word) {
+            let msg  = format!("reached end of file without parser leaving {}\n", function_name!());
+            let msg2 = format!("{word} is not a valid weekday : expected one of {days:?}\n");
+            let msg3 = format!("failure location: {cursor:?}");
+            return Err(format!("{}{}{}", msg, msg2, msg3))
+        }
+
+        word.to_string()
+    };
+
+    let month = {
+        // check for another word in the file
+        let (word, cursor) = word_reader.next_word().expect(
+            format!("reached end of file without parser leaving {}", function_name!()).as_str()
+        );
+
+        let months = [
+            "Jan", "Feb", "Mar", "Apr", 
+            "May", "Jun", "Jul", "Aug", 
+            "Sept", "Oct", "Nov", "Dec", 
+            ];
+
+        if !months.contains(&word) {
+            let msg  = format!("reached end of file without parser leaving {}\n", function_name!());
+            let msg2 = format!("{word} is not a valid month : expected one of {months:?}\n");
+            let msg3 = format!("failure location: {cursor:?}");
+            return Err(format!("{}{}{}", msg, msg2, msg3))
+        }
+
+        word.to_string()
+    };
+
+    let date = {
+        // check for another word in the file
+        let (word, cursor) = word_reader.next_word().expect(
+            format!("reached end of file without parser leaving {}", function_name!()).as_str()
+        );
+
+        let date : u8 = word.to_string().parse().unwrap();
+
+        if date > 31 {
+            let msg  = format!("reached end of file without parser leaving {}\n", function_name!());
+            let msg2 = format!("{word} is not a valid date : must be between 0 and 31\n");
+            let msg3 = format!("failure location: {cursor:?}");
+            return Err(format!("{}{}{}", msg, msg2, msg3))
+
+        }
+
+        word.to_string()
+    };
+
+    let (hh, mm, ss) = {
+        // check for another word in the file
+        let (word, cursor) = word_reader.next_word().expect(
+            format!("reached end of file without parser leaving {}", function_name!()).as_str()
+        );
+
+        let date : u8 = word.to_string().parse().unwrap();
+        // let hh = take_until(word, b':').unwrap();
+
+        if date > 31 {
+            let msg  = format!("reached end of file without parser leaving {}\n", function_name!());
+            let msg2 = format!("{word} is not a valid date : must be between 0 and 31\n");
+            let msg3 = format!("failure location: {cursor:?}");
+            return Err(format!("{}{}{}", msg, msg2, msg3))
+
+        }
+        ("", "", "")
+    };
+
+    // else if !parsed_date {
+
+    // }
+    // else if !parsed_hh {
+
+    // }
+    // else if !parsed_mm {
+
+    // }
+    // else if !parsed_ss {
+
+    // }
+    // else if !parsed_year {
+
+    // }
+    // else if !parsed_end {
+
+    // }
+
+    Ok(())
+}
+
+#[named]
+fn parse_header(word_reader : &mut WordReader) -> Result<(), String> {
+    loop {
+        // check for another word in the file
+        let word = word_reader.next_word();
+
+        // if there isn't another word left in the file, then we exit
+        if word.is_none() {
+            return Err(format!("reached end of file without parser leaving {}", function_name!()))
+        }
+
+        // destructure
+        let (word, cursor) = word.unwrap();
+        let ident = tag(word, "$");
+
+        match tag(word, "$") {
+            // we hope that this word stars with a `$`
+            Some(ident) =>  {
+                match ident {
+                    "date"      => {println!("got date")}
+                    "version"   => {println!("got version")}
+                    "timescale" => {println!("got timescale")}
+                    "scope"     => {return Ok(())}
+                    _ => {}
+                }
+            }
+            // if not, then we keep looping
+            None => {}
+        }
+
+
+    }
+    // Ok()
+}
+
+pub fn parse_vcd(file : File) {
+    let mut word_gen = WordReader::new(file);
+
+    parse_header(&mut word_gen);
+}

src/vcd/reader.rs

@@ -1,5 +1,3 @@
-use super::*;
-
 use std::fs::File;
 use std::collections::VecDeque;
 use std::slice;

src/vcd/types.rs

@@ -0,0 +1,59 @@
+use std::collections::BTreeMap;
+use chrono::prelude::*;
+use num::BigInt;
+
+#[derive(Debug)]
+struct Version(String);
+
+#[derive(Debug)]
+enum Timescale {ps, ns, us, ms, s, unit}
+
+#[derive(Debug)]
+pub(super) struct Metadata {
+    date      : Option<DateTime<Utc>>,
+    version   : Option<Version>,
+    timescale : (Option<u32>, Timescale)}
+
+#[derive(Debug)]
+struct Scope_Idx(usize);
+
+#[derive(Debug)]
+struct Signal_Idx(usize);
+
+#[derive(Debug)]
+enum SignalGeneric{
+    Signal{
+        name           : String,
+        timeline       : BTreeMap<BigInt, BigInt>,
+        scope_parent   : Scope_Idx},
+    SignalAlias{
+        name          : String,
+        signal_alias  : Signal_Idx}
+}
+
+#[derive(Debug)]
+struct Scope {
+    name          : String,
+    child_signals : Vec<Signal_Idx>,
+    child_scopes  : Vec<Scope_Idx>}
+
+
+#[derive(Debug)]
+struct VCD {
+    metadata    : Metadata,
+    all_signals : Vec<SignalGeneric>,
+    // the root scope should always be placed at index 0
+    all_scopes  : Vec<Scope>}
+
+impl VCD {
+    pub fn new() -> Self {
+        let metadata = Metadata {
+            date      : None,
+            version   : None,
+            timescale : (None, Timescale::unit)};
+        VCD {
+            metadata    : metadata,
+            all_signals : Vec::<SignalGeneric>::new(),
+            all_scopes  : Vec::<Scope>::new()}
+        }
+    }