1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156

pub use trans;

use std::collections::{HashMap, HashSet};
use std::fmt::Write;
use std::path::Path;
use trans::*;

pub mod gens;

#[derive(Debug)]
pub struct File {
    pub path: String,
    pub content: String,
}

#[derive(Debug)]
pub struct GenResult {
    pub files: Vec<File>,
}

impl GenResult {
    pub fn write_to<P: AsRef<Path>>(&self, target_dir: P) -> std::io::Result<()> {
        let target_dir = target_dir.as_ref();
        for file in &self.files {
            if let Some(parent) = Path::new(&file.path).parent() {
                std::fs::create_dir_all(target_dir.join(parent))?;
            }
            use std::io::Write;
            std::fs::File::create(target_dir.join(&file.path))?
                .write_all(file.content.as_bytes())?;
        }
        Ok(())
    }
}

impl From<HashMap<String, String>> for GenResult {
    fn from(file_map: HashMap<String, String>) -> Self {
        Self {
            files: file_map
                .into_iter()
                .map(|(path, content)| File { path, content })
                .collect(),
        }
    }
}

impl From<Vec<File>> for GenResult {
    fn from(files: Vec<File>) -> Self {
        Self { files }
    }
}

pub trait Generator {
    fn new(name: &str, version: &str) -> Self;
    fn add_only(&mut self, schema: &trans::Schema);
    fn result(self) -> GenResult;
}

pub struct GeneratorImpl<T: Generator> {
    inner: T,
    added: HashMap<trans::Name, trans::Schema>,
}

impl<T: Generator> GeneratorImpl<T> {
    pub fn new(name: &str, version: &str) -> Self {
        Self {
            inner: T::new(name, version),
            added: HashMap::new(),
        }
    }
    pub fn add(&mut self, schema: &Schema) {
        let schema_name = schema.full_name();
        let current = self.added.get(&schema_name);
        if let Some(current) = current {
            assert_eq!(
                current, schema,
                "Two schemas with same name but different structure"
            );
            return;
        }
        self.added.insert(schema_name, schema.clone());
        match schema {
            Schema::Struct(Struct { fields, .. }) => {
                for field in fields {
                    self.add(&field.schema);
                }
            }
            Schema::OneOf { variants, .. } => {
                for variant in variants {
                    for field in &variant.fields {
                        self.add(&field.schema);
                    }
                }
            }
            Schema::Option(inner) => {
                self.add(inner);
            }
            Schema::Vec(inner) => {
                self.add(inner);
            }
            Schema::Map(key_type, value_type) => {
                self.add(key_type);
                self.add(value_type);
            }
            Schema::Bool
            | Schema::Int32
            | Schema::Int64
            | Schema::Float32
            | Schema::Float64
            | Schema::String
            | Schema::Enum { .. } => {}
        }
        self.inner.add_only(schema);
    }
    pub fn result(self) -> GenResult {
        self.inner.result()
    }
}

pub struct Writer {
    content: String,
    ident_level: usize,
}

impl Writer {
    pub fn new() -> Self {
        Self {
            content: String::new(),
            ident_level: 0,
        }
    }
    pub fn inc_ident(&mut self) {
        self.ident_level += 1;
    }
    pub fn dec_ident(&mut self) {
        self.ident_level -= 1;
    }
    pub fn get(self) -> String {
        assert_eq!(self.ident_level, 0, "Incorrect indentation");
        self.content
    }
}

impl std::fmt::Write for Writer {
    fn write_str(&mut self, s: &str) -> std::fmt::Result {
        for c in s.chars() {
            if c != '\n' && self.content.chars().last().unwrap_or('\n') == '\n' {
                for _ in 0..self.ident_level * 4 {
                    self.content.push(' ');
                }
            }
            self.content.push(c);
        }
        Ok(())
    }
}