107 lines
3.0 KiB
Rust
107 lines
3.0 KiB
Rust
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use std::collections::HashMap;
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use std::env;
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use std::fs::File;
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use std::io::Write;
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use std::path::Path;
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use serde::{Deserialize, Serialize};
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struct AutoIncrement {
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next_val: usize,
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}
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impl AutoIncrement {
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fn new() -> AutoIncrement {
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AutoIncrement { next_val: 0 }
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}
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fn next(&mut self) -> usize {
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let v = self.next_val;
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self.next_val += 1;
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v
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}
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}
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struct TrieBuilderNode {
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children: HashMap<char, TrieBuilderNode>,
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value_as_code: Option<String>,
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}
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impl TrieBuilderNode {
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fn new() -> TrieBuilderNode {
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TrieBuilderNode {
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children: HashMap::new(),
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value_as_code: None,
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}
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}
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fn add(&mut self, pat: &str, val: String) -> () {
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let mut current = self;
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for c in pat.chars() {
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if !current.children.contains_key(&c) {
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current.children.insert(c, TrieBuilderNode::new());
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};
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current = current.children.get_mut(&c).unwrap();
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};
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current.value_as_code = Some(val);
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}
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fn build(&self, ai: &mut AutoIncrement, value_type: &'static str, out: &mut String) -> usize {
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let child_ids: Vec<(char, usize)> = self.children
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.iter()
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.map(|(&c, n)| (c, n.build(ai, value_type, out)))
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.collect();
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let id = ai.next();
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out.push_str(format!("static N{}: TrieNode<{}> = TrieNode::<{}> {{\n", id, value_type, value_type).as_str());
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out.push_str(format!("children: phf_map! {{\n").as_str());
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for (c, n) in child_ids {
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out.push_str(format!("b'{}' => &N{},\n", c, n).as_str());
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}
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out.push_str("},\n");
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out.push_str("value: ");
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match &self.value_as_code {
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Some(v) => {
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out.push_str(format!("Some({})", v).as_str());
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}
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None => out.push_str("None"),
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};
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out.push_str(",\n};\n");
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id
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}
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}
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#[derive(Serialize, Deserialize, Debug)]
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struct Entity {
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codepoints: Vec<u32>,
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characters: String,
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}
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fn generate_entities() {
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let entities_path = Path::new("gen").join("entities.json");
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let entities_file = File::open(entities_path).unwrap();
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let entities: HashMap<String, Entity> = serde_json::from_reader(entities_file).unwrap();
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let mut trie_builder = TrieBuilderNode::new();
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for (rep, entity) in entities {
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trie_builder.add(&rep[1..], format!("b\"{}\"",
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entity.characters.as_bytes().iter().map(|b| format!("\\x{:02x}", b)).collect::<String>()
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));
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}
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let mut trie_code = String::new();
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let trie_root_id = trie_builder.build(&mut AutoIncrement::new(), "&'static [u8]", &mut trie_code);
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let out_dir = env::var("OUT_DIR").unwrap();
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let dest_path = Path::new(&out_dir).join("gen_entities.rs");
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let mut dest_file = File::create(&dest_path).unwrap();
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dest_file.write_all(trie_code
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.replace(format!("static N{}:", trie_root_id).as_str(), "pub static ENTITY_REFERENCES:")
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.as_bytes()).unwrap();
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}
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fn main() {
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generate_entities();
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}
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