### Build TF Demo Parser with Cargo

Source: https://github.com/demostf/parser/blob/master/README.md

This command builds the TF Demo Parser project in release mode using Cargo. It requires Rust and Cargo to be installed. The resulting binary will be placed in the `target/release/` directory.

```bash
cargo build --release
```

--------------------------------

### Handle Demo Data with Custom Analyzer in Rust

Source: https://github.com/demostf/parser/blob/master/README.md

This Rust code illustrates how to use a custom `Analyser` with the `tf_demo_parser` crate to process demo data. It shows the instantiation of `DemoParser` with a custom analyzer and the subsequent parsing of the demo file, returning the header and state.

```rust
DemoParser::new_all_with_analyser(demo.get_stream(), CustomAnalyser::new());
let (header, state) = parser.parse()?;
```

--------------------------------

### Process Demo Data Packet by Packet for Memory-Efficient Streaming (Rust)

Source: https://context7.com/demostf/parser/llms.txt

Reads a demo file, initializes a `DemoHandler` and `RawPacketStream`, and processes the demo data packet by packet. This method is memory-efficient for large demo files. It reads the header first and then streams packets, allowing for real-time handling of game events. Includes a warning for incomplete demo files. Requires `tf_demo_parser` and `bitbuffer` crates.

```rust
use bitbuffer::BitRead;
use std::fs;
use tf_demo_parser::demo::header::Header;
use tf_demo_parser::demo::parser::{DemoHandler, RawPacketStream};
use tf_demo_parser::Demo;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = fs::read("match.dem")?;
    let demo = Demo::new(&file);

    // Initialize handler
    let mut handler = DemoHandler::default();

    // Read header
    let mut stream = demo.get_stream();
    let header = Header::read(&mut stream)?;
    handler.handle_header(&header);

    println!("Processing demo: {} on {}", header.nick, header.map);

    // Stream packets
    let mut packets = RawPacketStream::new(stream);
    let mut packet_count = 0;

    while let Some(packet) = packets.next(&handler.state_handler)? {
        handler.handle_packet(packet)?;
        packet_count += 1;

        if packet_count % 1000 == 0 {
            println!("Processed {} packets", packet_count);
        }
    }

    // Check if demo was complete
    if packets.incomplete {
        eprintln!("Warning: Demo file is incomplete");
    }

    println!("Total packets: {}", packet_count);
    Ok(())
}
```

--------------------------------

### Parse Demo File and Extract Match Summary with Player Statistics (Rust)

Source: https://context7.com/demostf/parser/llms.txt

Initializes a Demo object from a file, parses it using the default analyzer, and extracts header information like map, server, and duration, along with match state data such as deaths, rounds, and player counts. It iterates through deaths and chat messages to display detailed event information. Requires the `tf_demo_parser` crate.

```rust
use std::fs;
use tf_demo_parser::{Demo, DemoParser};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Read demo file
    let file = fs::read("match.dem")?;

    // Create demo instance
    let demo = Demo::new(&file);

    // Parse with default analyzer
    let parser = DemoParser::new(demo.get_stream());
    let (header, state) = parser.parse()?;

    // Access header information
    println!("Map: {}", header.map);
    println!("Server: {}", header.server);
    println!("Duration: {}s", header.duration);
    println!("Player nick: {}", header.nick);

    // Access match state
    println!("\nDeaths: {}", state.deaths.len());
    println!("Rounds: {}", state.rounds.len());
    println!("Players: {}", state.users.len());

    // Iterate through deaths
    for death in &state.deaths {
        println!("Player {} killed by {} with {}",
            death.victim, death.killer, death.weapon);
    }

    // Access chat messages
    for chat in &state.chat {
        println!("[{}] {}: {}", chat.tick, chat.from, chat.text);
    }

    Ok(())
}
```

--------------------------------

### Create Demo from Owned Bytes in Rust

Source: https://context7.com/demostf/parser/llms.txt

This Rust code reads a demo file into an owned `Vec<u8>`, creates a `Demo` object using `Demo::owned()`, and then parses it. It demonstrates how the owned `Demo` can be passed to other functions, such as `process_demo_elsewhere`, without lifetime constraints.

```rust
use std::fs;
use tf_demo_parser::{Demo, DemoParser};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Read file into owned Vec<u8>
    let bytes = fs::read("match.dem")?;

    // Create demo with owned data (static lifetime)
    let demo = Demo::owned(bytes);

    // Parse normally
    let parser = DemoParser::new(demo.get_stream());
    let (header, state) = parser.parse()?;

    println!("Parsed demo: {}", header.map);
    println!("Players: {}", state.users.len());

    // Demo now owns the data and can be moved freely
    process_demo_elsewhere(demo)?;

    Ok(())
}

fn process_demo_elsewhere(demo: Demo<'static>) -> Result<(), Box<dyn std::error::Error>> {
    // Can use demo in different context with static lifetime
    let parser = DemoParser::new(demo.get_stream());
    let (_, state) = parser.parse()?;

    println!("Found {} deaths", state.deaths.len());
    Ok(())
}
```

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### Parse Player Statistics and Class Info in Rust

Source: https://context7.com/demostf/parser/llms.txt

Parses a TF2 demo file to extract detailed player statistics, including class playtime, kills, deaths, assists, and top weapon usage. It reads the demo file, parses its content, and iterates through player data to display collected information. No external dependencies beyond the `tf_demo_parser` crate are required.

```rust
use std::fs;
use tf_demo_parser::demo::parser::analyser::{Class, Team};
use tf_demo_parser::{Demo, DemoParser};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = fs::read("match.dem")?;
    let demo = Demo::new(&file);

    let parser = DemoParser::new(demo.get_stream());
    let (header, state) = parser.parse()?;

    println!("Match on {}
", header.map);

    // Analyze each player
    for (user_id, user_info) in &state.users {
        println!("Player: {} ({})", user_info.name, user_info.steam_id);
        println!("  Team: {}", user_info.team);

        // Get classes sorted by playtime
        let classes: Vec<_> = user_info.classes.sorted().collect();
        println!("  Classes played:");

        for (class, spawns) in classes {
            println!("    {}: {} spawns", class, spawns);
        }

        // Count kills and deaths
        let kills = state.deaths.iter()
            .filter(|d| d.killer == *user_id)
            .count();
        let deaths = state.deaths.iter()
            .filter(|d| d.victim == *user_id)
            .count();
        let assists = state.deaths.iter()
            .filter(|d| d.assister.map_or(false, |a| a == *user_id))
            .count();

        println!("  K/D/A: {}/{}/{}", kills, deaths, assists);

        // Weapon usage
        let mut weapons: std::collections::HashMap<&str, usize> =
            std::collections::HashMap::new();

        for death in &state.deaths {
            if death.killer == *user_id {
                *weapons.entry(&death.weapon).or_insert(0) += 1;
            }
        }

        if !weapons.is_empty() {
            println!("  Weapon usage:");
            let mut weapon_list: Vec<_> = weapons.into_iter().collect();
            weapon_list.sort_by_key(|(_, count)| std::cmp::Reverse(*count));

            for (weapon, count) in weapon_list.iter().take(3) {
                println!("    {}: {} kills", weapon, count);
            }
        }

        println!();
    }

    // Round information
    println!("Rounds played: {}", state.rounds.len());
    for (i, round) in state.rounds.iter().enumerate() {
        println!(
            "  Round {}: {} won in {:.1}s (tick {})",
            i + 1, round.winner, round.length, round.end_tick
        );
    }

    Ok(())
}

```

--------------------------------

### Loop Through Demo Packets in Rust

Source: https://github.com/demostf/parser/blob/master/README.md

This Rust code snippet demonstrates how to read a tf2 demo file, parse its header, and then iterate through all the raw packets within the stream. It uses the `tf_demo_parser` crate and `bitbuffer` for reading packet data. The handler processes each packet, and an assertion checks for incomplete streams.

```rust
use bitbuffer::BitRead;
use main_error::MainError;
use std::fs;
use tf_demo_parser::demo::header::Header;
use tf_demo_parser::demo::parser::{DemoHandler, RawPacketStream};
use tf_demo_parser::Demo;

fn main() -> Result<(), MainError> {
    let file = fs::read("demofile.dem")?;

    let demo = Demo::new(&file);
    let mut handler = DemoHandler::default();

    let mut stream = demo.get_stream();
    let header = Header::read(&mut stream)?;
    handler.handle_header(&header);

    let mut packets = RawPacketStream::new(stream);

    while let Some(packet) = packets.next(&handler.state_handler)? {
        handler.handle_packet(packet).unwrap();
    }
    assert_eq!(false, packets.incomplete);

    Ok(())
}
```

--------------------------------

### Process Game Events and Chat Messages in Rust

Source: https://context7.com/demostf/parser/llms.txt

Demonstrates parsing a TF2 demo file to analyze game events like player spawns, deaths, and round outcomes, as well as extracting chat messages. It utilizes a custom `MessageHandler` implementation for game events and then re-parses the demo for chat data. Requires the `tf_demo_parser` crate.

```rust
use std::fs;
use tf_demo_parser::demo::gameevent_gen::GameEvent;
use tf_demo_parser::demo::parser::MessageHandler;
use tf_demo_parser::demo::message::Message;
use tf_demo_parser::demo::data::DemoTick;
use tf_demo_parser::{Demo, DemoParser, MessageType, ParserState};

#[derive(Default)]
struct EventAnalyzer {
    player_spawns: usize,
    player_deaths: usize,
    round_events: usize,
}

impl MessageHandler for EventAnalyzer {
    type Output = Self;

    fn does_handle(message_type: MessageType) -> bool {
        matches!(message_type, MessageType::GameEvent)
    }

    fn handle_message(&mut self, message: &Message, _tick: DemoTick, _state: &ParserState) {
        if let Message::GameEvent(msg) = message {
            match &msg.event {
                GameEvent::PlayerSpawn(_) => self.player_spawns += 1,
                GameEvent::PlayerDeath(_) => self.player_deaths += 1,
                GameEvent::TeamPlayRoundWin(_) | 
                GameEvent::TeamPlayRoundStart(_) => self.round_events += 1,
                _ => {}
            }
        }
    }

    fn into_output(self, _state: &ParserState) -> Self::Output {
        self
    }
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = fs::read("match.dem")?;
    let demo = Demo::new(&file);

    // Parse with event analyzer
    let parser = DemoParser::new_with_analyser(
        demo.get_stream(),
        EventAnalyzer::default()
    );

    let (header, events) = parser.parse()?;

    println!("Demo: {} on {}
", header.nick, header.map);
    println!("Game Events:");
    println!("  Player spawns: {}", events.player_spawns);
    println!("  Player deaths: {}", events.player_deaths);
    println!("  Round events: {}", events.round_events);

    // Re-parse for chat messages
    let demo2 = Demo::new(&file);
    let parser2 = DemoParser::new(demo2.get_stream());
    let (_, state) = parser2.parse()?;

    println!("\nChat Messages:");
    for chat in &state.chat {
        let time = (chat.tick as f32) * state.interval_per_tick;
        println!("[{:.1}s] {}: {}", time, chat.from, chat.text);
    }

    Ok(())
}

```

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### Tick-by-Tick State Inspection with tf-demo-parser in Rust

Source: https://context7.com/demostf/parser/llms.txt

This snippet demonstrates how to use the ticker functionality of tf-demo-parser in Rust to inspect the game state at each tick of a Team Fortress 2 demo file.  It creates a parser with an analyser, retrieves a ticker for step-by-step processing, and then iterates through each tick to access and print information about deaths and entity counts.  Finally, it prints the final statistics of the demo.

```rust
use std::fs;
use tf_demo_parser::demo::parser::analyser::{Analyser, MatchState};
use tf_demo_parser::{Demo, DemoParser};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = fs::read("match.dem")?;
    let demo = Demo::new(&file);

    // Create parser with analyzer that supports borrowing
    let parser = DemoParser::new_with_analyser(demo.get_stream(), Analyser::new());

    // Get ticker for step-by-step processing
    let (header, mut ticker) = parser.ticker()?;

    println!("Analyzing demo: {} on {}", header.nick, header.map);

    let mut tick_count = 0;
    let mut previous_deaths = 0;

    // Process each tick
    while let Some(tick_state) = ticker.next()? {
        tick_count += 1;

        // Access state at current tick
        let current_deaths = tick_state.state.deaths.len();

        // Detect new deaths
        if current_deaths > previous_deaths {
            let death = &tick_state.state.deaths[current_deaths - 1];
            println!(
                "Tick {}: Player {} killed by {} with {}",
                tick_state.tick,
                death.victim,
                death.killer,
                death.weapon
            );
        }

        previous_deaths = current_deaths;

        // Access parser state for entity information
        let entity_count = tick_state.parser_state.entities.len();
        if tick_count % 1000 == 0 {
            println!("Tick {}: {} entities tracked", tick_state.tick, entity_count);
        }
    }

    // Get final state
    let final_state = ticker.into_state();
    println!("\nFinal statistics:");
    println!("  Total deaths: {}", final_state.deaths.len());
    println!("  Total rounds: {}", final_state.rounds.len());
    println!("  Players: {}", final_state.users.len());

    Ok(())
}
```

--------------------------------

### Custom Analyzer for Entity Properties in Rust

Source: https://context7.com/demostf/parser/llms.txt

This snippet demonstrates how to implement a custom analyzer with tf-demo-parser in Rust to track and extract specific entity properties from a Team Fortress 2 demo file. It defines a `PropAnalyzer` struct that implements the `MessageHandler` trait to collect send property identifiers and names. The analyzer outputs a sorted list of unique properties found in the demo.

```rust
use fnv::{FnvHashMap, FnvHashSet};
use std::fs;
use tf_demo_parser::demo::data::DemoTick;
use tf_demo_parser::demo::message::Message;
use tf_demo_parser::demo::packet::datatable::{ParseSendTable, ServerClass};
use tf_demo_parser::demo::parser::MessageHandler;
use tf_demo_parser::demo::sendprop::{SendPropIdentifier, SendPropName};
use tf_demo_parser::{Demo, DemoParser, MessageType, ParserState};

// Custom analyzer to track all entity properties
#[derive(Default)]
struct PropAnalyzer {
    props: FnvHashSet<SendPropIdentifier>,
    prop_names: FnvHashMap<SendPropIdentifier, (String, SendPropName)>,
}

impl MessageHandler for PropAnalyzer {
    type Output = Vec<String>;

    fn does_handle(message_type: MessageType) -> bool {
        matches!(message_type, MessageType::PacketEntities)
    }

    fn handle_message(&mut self, message: &Message, _tick: DemoTick, _state: &ParserState) {
        if let Message::PacketEntities(msg) = message {
            for entity in &msg.entities {
                for prop in &entity.props {
                    self.props.insert(prop.identifier);
                }
            }
        }
    }

    fn handle_data_tables(
        &mut self,
        parse_tables: &[ParseSendTable],
        _server_classes: &[ServerClass],
        _state: &ParserState,
    ) {
        for table in parse_tables {
            for prop_def in &table.props {
                self.prop_names.insert(
                    prop_def.identifier(),
                    (table.name.to_string(), prop_def.name.clone()),
                );
            }
        }
    }

    fn into_output(self, _state: &ParserState) -> Self::Output {
        let mut props: Vec<String> = self.props
            .into_iter()
            .filter_map(|prop| {
                self.prop_names.get(&prop).map(|(table, name)| {
                    format!("{}.{}", table, name)
                })
            })
            .collect();
        props.sort();
        props
    }
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let file = fs::read("match.dem")?;
    let demo = Demo::new(&file);

    // Use custom analyzer
    let parser = DemoParser::new_with_analyser(
        demo.get_stream(),
        PropAnalyzer::default()
    );

    let (header, props) = parser.parse()?;

    println!("Demo: {} on {}", header.nick, header.map);
    println!("Found {} unique properties:", props.len());

    for prop in props.iter().take(10) {
        println!("  {}", prop);
    }

    Ok(())
}
```

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