symoxide 0.1.2

Intermediate Representation and Transformations for Computer Algebra Systems
Documentation 
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use crate::mappers::CachedMapper;
use crate::primitives::{BinaryOpType, Expression, LiteralT, SmallVecExprT, UnaryOpType};
use crate::utils::ExpressionRawPointer;
use std::rc::Rc;

// {{{ FoldMapper

pub trait FoldMapper: CachedMapper<ExpressionRawPointer, Self::Output> {
    type Output: Clone;

    fn visit(&mut self, expr: &Rc<Expression>) -> Self::Output {
        let cache_key = ExpressionRawPointer(expr.clone());
        match self.query_cache(&cache_key) {
            Some(x) => x.clone(),
            None => {
                let result = match &*(expr.clone()) {
                    Expression::Scalar(s) => self.map_scalar(&s),
                    Expression::Variable(name) => self.map_variable(name.to_string()),
                    Expression::UnaryOp(op, x) => self.map_unary_op(op.clone(), x),
                    Expression::BinaryOp(l, op, r) => self.map_binary_op(l, op.clone(), r),
                    Expression::Call(call, params) => self.map_call(call, &params),
                    Expression::Subscript(agg, indices) => self.map_subscript(agg, indices),
                    Expression::If(cond, then, else_) => self.map_if(cond, then, else_),
                };
                self.add_to_cache(cache_key, result.clone());
                result
            }
        }
    }

    fn map_scalar(&mut self, value: &LiteralT) -> Self::Output;
    fn map_variable(&mut self, name: String) -> Self::Output;
    fn map_unary_op(&mut self, op: UnaryOpType, x: &Rc<Expression>) -> Self::Output;
    fn map_binary_op(&mut self, left: &Rc<Expression>, op: BinaryOpType, right: &Rc<Expression>)
                     -> Self::Output;
    fn map_call(&mut self, call: &Rc<Expression>, params: &SmallVecExprT) -> Self::Output;
    fn map_subscript(&mut self, agg: &Rc<Expression>, indices: &SmallVecExprT) -> Self::Output;
    fn map_if(&mut self, cond: &Rc<Expression>, then: &Rc<Expression>, else_: &Rc<Expression>)
              -> Self::Output;
}

// }}}

// {{{ UncachedFoldMapper

pub trait UncachedFoldMapper {
    type Output;

    fn visit(&self, expr: &Expression) -> Self::Output {
        match expr {
            Expression::Scalar(s) => self.map_scalar(&s),
            Expression::Variable(name) => self.map_variable(name.to_string()),
            Expression::UnaryOp(op, x) => self.map_unary_op(op.clone(), x),
            Expression::BinaryOp(l, op, r) => self.map_binary_op(l, op.clone(), r),
            Expression::Call(call, params) => self.map_call(call, &params),
            Expression::Subscript(agg, indices) => self.map_subscript(agg, indices),
            Expression::If(cond, then, else_) => self.map_if(cond, then, else_),
        }
    }

    fn map_scalar(&self, value: &LiteralT) -> Self::Output;
    fn map_variable(&self, name: String) -> Self::Output;
    fn map_unary_op(&self, op: UnaryOpType, x: &Expression) -> Self::Output;
    fn map_binary_op(&self, left: &Expression, op: BinaryOpType, right: &Expression)
                     -> Self::Output;
    fn map_call(&self, call: &Expression, params: &SmallVecExprT) -> Self::Output;
    fn map_subscript(&self, agg: &Expression, indices: &SmallVecExprT) -> Self::Output;
    fn map_if(&self, cond: &Expression, then: &Expression, else_: &Expression) -> Self::Output;
}

// }}}

// {{{ UncachedFoldMapperWithContext

pub trait UncachedFoldMapperWithContext {
    type Context;
    type Output;

    fn visit(&self, expr: &Expression, context: &Self::Context) -> Self::Output {
        match expr {
            Expression::Scalar(s) => self.map_scalar(&s, context),
            Expression::Variable(name) => self.map_variable(name.to_string(), context),
            Expression::UnaryOp(op, x) => self.map_unary_op(op.clone(), &x, context),
            Expression::BinaryOp(l, op, r) => self.map_binary_op(&l, op.clone(), &r, context),
            Expression::Call(call, params) => self.map_call(&call, &params, context),
            Expression::Subscript(agg, indices) => self.map_subscript(&agg, &indices, context),
            Expression::If(cond, then, else_) => self.map_if(&cond, &then, &else_, context),
        }
    }

    fn map_scalar(&self, value: &LiteralT, context: &Self::Context) -> Self::Output;
    fn map_variable(&self, name: String, context: &Self::Context) -> Self::Output;
    fn map_unary_op(&self, op: UnaryOpType, x: &Expression, context: &Self::Context)
                    -> Self::Output;
    fn map_binary_op(&self, left: &Expression, op: BinaryOpType, right: &Expression,
                     context: &Self::Context)
                     -> Self::Output;
    fn map_call(&self, call: &Expression, params: &SmallVecExprT, context: &Self::Context)
                -> Self::Output;
    fn map_subscript(&self, agg: &Expression, indices: &SmallVecExprT, context: &Self::Context)
                     -> Self::Output;
    fn map_if(&self, cond: &Expression, then: &Expression, else_: &Expression,
              context: &Self::Context)
              -> Self::Output;
}

// }}}

// {{{ FoldMapperWithContext

pub trait FoldMapperWithContext: CachedMapper<Self::CacheKey, Self::Output> {
    type CacheKey;
    type Context;
    type Output: Clone;

    fn get_cache_key(&self, expr: &Rc<Expression>, context: &Self::Context) -> Self::CacheKey;

    fn visit(&mut self, expr: &Rc<Expression>, context: &Self::Context) -> Self::Output {
        let cache_key = self.get_cache_key(&expr, context);
        match self.query_cache(&cache_key) {
            Some(x) => x.clone(),
            None => {
                let result = match &*(expr.clone()) {
                    Expression::Scalar(s) => self.map_scalar(&s, context),
                    Expression::Variable(name) => self.map_variable(name.to_string(), context),
                    Expression::UnaryOp(op, x) => self.map_unary_op(op.clone(), &x, context),
                    Expression::BinaryOp(l, op, r) => {
                        self.map_binary_op(&l, op.clone(), &r, context)
                    }
                    Expression::Call(call, params) => self.map_call(&call, &params, context),
                    Expression::Subscript(agg, indices) => {
                        self.map_subscript(&agg, &indices, context)
                    }
                    Expression::If(cond, then, else_) => self.map_if(&cond, &then, &else_, context),
                };
                self.add_to_cache(cache_key, result.clone());
                result
            }
        }
    }

    fn map_scalar(&mut self, value: &LiteralT, context: &Self::Context) -> Self::Output;
    fn map_variable(&mut self, name: String, context: &Self::Context) -> Self::Output;
    fn map_unary_op(&mut self, op: UnaryOpType, x: &Rc<Expression>, context: &Self::Context)
                    -> Self::Output;
    fn map_binary_op(&mut self, left: &Rc<Expression>, op: BinaryOpType, right: &Rc<Expression>,
                     context: &Self::Context)
                     -> Self::Output;
    fn map_call(&mut self, call: &Rc<Expression>, params: &SmallVecExprT, context: &Self::Context)
                -> Self::Output;
    fn map_subscript(&mut self, agg: &Rc<Expression>, indices: &SmallVecExprT,
                     context: &Self::Context)
                     -> Self::Output;
    fn map_if(&mut self, cond: &Rc<Expression>, then: &Rc<Expression>, else_: &Rc<Expression>,
              context: &Self::Context)
              -> Self::Output;
}

// }}}

// vim: fdm=marker