2023-11-16 19:45:13 -07:00
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use rand::Rng;
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use rand_distr::Distribution;
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2023-11-16 16:27:03 -07:00
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use crate::params::Params;
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use crate::ast::{
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Expr,
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Statement,
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Quantifier,
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BaseType,
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GlobalBlock,
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Block,
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Literal,
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Declaration,
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DeclarationBuilder,
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Variable,
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VariableBuilder,
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BinaryOperator,
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};
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pub struct AstBuilder {
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params: Params,
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ast: GlobalBlock,
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name_counter: u64,
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rng: rand::rngs::ThreadRng,
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rng_float: FloatGenerator,
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}
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impl AstBuilder {
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pub fn from(params: Params) -> Self {
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Self {
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ast: GlobalBlock::default(),
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name_counter: 0,
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rng: rand::thread_rng(),
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rng_float: FloatGenerator::new(¶ms),
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params,
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}
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}
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2023-11-16 19:45:13 -07:00
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pub fn generate(&mut self) {
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let mut p: f64;
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loop {
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p = self.rng.gen();
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if p < self.params.global_flow.end_generation {
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break;
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} else {
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let decl = self.gen_decl();
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self.ast.push(decl);
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}
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}
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}
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fn gen_decl(&mut self) -> Box<dyn Statement> {
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let t = BaseType::Real;
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let v = self.gen_variable_quantified(t, Quantifier::Const);
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Box::new(
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DeclarationBuilder::default()
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.variable(v)
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.assn(self.gen_literal(t))
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.build()
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.unwrap()
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)
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}
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fn gen_variable(&mut self, t: BaseType) -> Variable {
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VariableBuilder::default()
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.type_(t)
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.name(self.gen_name())
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.quantifer(Quantifier::Var)
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.build()
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.unwrap()
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}
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fn gen_variable_quantified(&mut self, t: BaseType, q: Quantifier) -> Variable {
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VariableBuilder::default()
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.type_(t)
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.name(self.gen_name())
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.quantifer(q)
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.build()
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.unwrap()
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}
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fn gen_name(&mut self) -> String {
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let s = format!("_{}", self.name_counter);
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self.name_counter += 1;
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s
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}
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//fn gen_expr(&mut self, type_: BaseType) -> Box<dyn Expr> {
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//}
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fn gen_literal(&mut self, t: BaseType) -> Literal {
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match t {
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BaseType::Int => {
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let r = rand_distr::Beta::new(0.01, 0.01).unwrap();
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let i: i32 = (r.sample(&mut self.rng) * (i32::MAX as f64)) as i32;
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Literal::Int(i)
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}
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BaseType::Real => {
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let f = self.rng_float.sample(&mut self.rng);
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Literal::Real(f)
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}
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BaseType::Never => panic!("Attempted to generate literal of type Never"),
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BaseType::Unset => panic!("Attempted to generate literal of type Unset"),
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}
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}
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}
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impl ToString for AstBuilder {
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fn to_string(&self) -> String {
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let mut s = format!("// Generated by {} v{}\n",
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env!("CARGO_PKG_NAME"),
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env!("CARGO_PKG_VERSION"),
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);
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s.push_str(&self.ast.to_string());
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s
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}
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}
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/// Generates values from regions of interest for a float
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///
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/// These are concentrated around f32::MIN, 0, and f32::MAX, though any f32 value is possible
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struct FloatGenerator {
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distro_pos: rand_distr::Normal<f32>,
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distro_zero: rand_distr::Normal<f32>,
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distro_neg: rand_distr::Normal<f32>,
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}
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impl FloatGenerator {
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fn new(p: &Params) -> Self {
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FloatGenerator {
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distro_pos: rand_distr::Normal::new(1.0, p.dev.float_gen_distro_pos_stddiv).unwrap(),
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distro_zero: rand_distr::Normal::new(0.0, 3.0).unwrap(),
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distro_neg: rand_distr::Normal::new(1.0, p.dev.float_gen_distro_neg_stddiv).unwrap(),
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}
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}
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}
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impl Distribution<f32> for FloatGenerator {
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fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> f32 {
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let p: f64 = rng.gen();
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if p < 0.33 {
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f32::MAX - self.distro_pos.sample(rng).abs()
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} else if p < 0.66 {
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self.distro_zero.sample(rng)
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} else {
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-1.0 * (f32::MAX - self.distro_neg.sample(rng).abs())
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}
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}
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}
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