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Implement addition

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This commit is contained in:
Jeff 2023-10-01 04:20:29 -04:00
parent b476818ba3
commit 3b0b9d044e
3 changed files with 171 additions and 135 deletions
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4
src/error.rs
View File

@ -12,7 +12,7 @@ pub type Result<T> = std::result::Result<T, Error>;
#[derive(Debug, Clone, PartialEq)]
#[non_exhaustive]
pub enum Error {
UnexpectedSourceNode {
UnexpectedSyntax {
expected: &'static str,
actual: &'static str,
location: tree_sitter::Point,
@ -553,7 +553,7 @@ impl fmt::Display for Error {
macro_info.identifier,
macro_info.inputs
),
UnexpectedSourceNode { expected, actual, location } => write!(f, "Unexpected syntax at {location}. Expected {expected}, but found {actual}."),
UnexpectedSyntax { expected, actual, location } => write!(f, "Unexpected syntax at {location}. Expected {expected}, but found {actual}."),
ExpectedFieldName => write!(f, "Expected a field name for this node, but none was found."),
WrongTypeCombination { expected, actual } => write!(f, "Wrong type combination. Expected {expected}, found {actual}."),
ExpectedChildNode { empty_node_sexp } => write!(f, "Expected this node to have a child, {empty_node_sexp}."),

298
src/interface.rs
View File

@ -5,7 +5,7 @@
use std::fmt::{self, Debug, Formatter};
use serde::{Deserialize, Serialize};
use tree_sitter::{Node, Parser, Tree as TSTree, TreeCursor};
use tree_sitter::{Node, Parser, Tree as TSTree};
use crate::{language, Error, Result, Value, VariableMap};
@ -52,7 +52,8 @@ pub fn eval_with_context(source: &str, context: &mut VariableMap) -> Vec<Result<
Evaluator::new(parser, context, source).run()
}
trait EvaluatorTree: Sized {
/// This trait is implemented by the Evaluator's internal types.
pub trait EvaluatorTree: Sized {
/// Interpret the syntax tree at the given node and return the abstraction.
///
/// This function is used to convert nodes in the Tree Sitter concrete
@ -65,7 +66,7 @@ trait EvaluatorTree: Sized {
fn new(node: Node, source: &str) -> Result<Self>;
/// Execute dust code by traversing the tree
fn run() -> Vec<Result<Value>>;
fn run(&self, context: &mut VariableMap) -> Result<Value>;
}
/// A collection of statements and comments interpreted from a syntax tree.
@ -109,8 +110,6 @@ impl<'context, 'code> Evaluator<'context, 'code> {
Err(error) => results.push(Err(error)),
}
println!("{node:?}");
// This iterator will run forever without this check.
if index == root_node.child_count() - 1 {
break;
@ -120,9 +119,7 @@ impl<'context, 'code> Evaluator<'context, 'code> {
for item in &items {
match item {
Item::Comment(comment) => results.push(Ok(Value::String(comment.to_string()))),
Item::Statement(statement) => {
results.push(statement.run(self.context, &mut cursor, self.source))
}
Item::Statement(statement) => results.push(statement.run(self.context)),
}
}
@ -144,7 +141,7 @@ pub enum Item {
impl Item {
fn new(node: Node, source: &str) -> Result<Self> {
if node.kind() != "item" {
return Err(Error::UnexpectedSourceNode {
return Err(Error::UnexpectedSyntax {
expected: "item",
actual: node.kind(),
location: node.start_position(),
@ -159,10 +156,11 @@ impl Item {
Ok(Item::Comment(comment_text.to_string()))
} else if child.kind() == "statement" {
let child = node.child(0).unwrap();
Ok(Item::Statement(Statement::new(child, source)?))
let grandchild = child.child(0).unwrap();
Ok(Item::Statement(Statement::new(grandchild, source)?))
} else {
Err(Error::UnexpectedSourceNode {
Err(Error::UnexpectedSyntax {
expected: "comment or statement",
actual: node.kind(),
location: node.start_position(),
@ -171,7 +169,7 @@ impl Item {
}
}
/// Representation of a statement in the .
/// Abstract representation of a statement.
///
/// Items are either comments, which do nothing, or statements, which can be run
/// to produce a single value or interact with a context by creating or
@ -181,19 +179,13 @@ pub enum Statement {
Expression(Expression),
}
impl Statement {
pub fn new(node: Node, source: &str) -> Result<Self> {
let node = if node.kind() == "statement" {
node.child(0).unwrap()
} else {
node
};
impl EvaluatorTree for Statement {
fn new(node: Node, source: &str) -> Result<Self> {
let child = node.child(0).unwrap();
match node.kind() {
"expression" => Ok(Self::Expression(Expression::new(child, source)?)),
_ => Err(Error::UnexpectedSourceNode {
_ => Err(Error::UnexpectedSyntax {
expected: "expression",
actual: node.kind(),
location: node.start_position(),
@ -201,14 +193,9 @@ impl Statement {
}
}
fn run(
&self,
context: &mut VariableMap,
mut cursor: &mut TreeCursor,
source: &str,
) -> Result<Value> {
fn run(&self, context: &mut VariableMap) -> Result<Value> {
match self {
Statement::Expression(expression) => expression.run(context, &mut cursor, source),
Statement::Expression(expression) => expression.run(context),
}
}
}
@ -219,6 +206,157 @@ pub enum Expression {
Value(Value),
ControlFlow(Box<ControlFlow>),
Assignment(Box<Assignment>),
Math(Box<Math>),
}
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub struct Math {
left: Expression,
operator: MathOperator,
right: Expression,
}
impl EvaluatorTree for Math {
fn new(node: Node, source: &str) -> Result<Self> {
let left_node = node.child(0).unwrap();
let operator_node = node.child(1).unwrap().child(0).unwrap();
let right_node = node.child(2).unwrap();
println!("{left_node:#?}");
println!("{operator_node:#?}");
println!("{right_node:#?}");
let operator = match operator_node.kind() {
"+" => MathOperator::Add,
"-" => MathOperator::Subtract,
"*" => MathOperator::Multiply,
"/" => MathOperator::Divide,
"%" => MathOperator::Modulo,
_ => {
return Err(Error::UnexpectedSyntax {
expected: "+, -, *, / or %",
actual: operator_node.kind(),
location: operator_node.start_position(),
})
}
};
Ok(Math {
left: Expression::new(left_node, source)?,
operator,
right: Expression::new(right_node, source)?,
})
}
fn run(&self, context: &mut VariableMap) -> Result<Value> {
let left_value = self.left.run(context)?.as_number()?;
let right_value = self.right.run(context)?.as_number()?;
let outcome = match self.operator {
MathOperator::Add => left_value + right_value,
MathOperator::Subtract => left_value - right_value,
MathOperator::Multiply => left_value * right_value,
MathOperator::Divide => left_value / right_value,
MathOperator::Modulo => left_value % right_value,
};
Ok(Value::Float(outcome))
}
}
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub enum MathOperator {
Add,
Subtract,
Multiply,
Divide,
Modulo,
}
impl EvaluatorTree for Expression {
fn new(node: Node, source: &str) -> Result<Self> {
let node = if node.kind() == "expression" {
node.child(0).unwrap()
} else {
node
};
let expression = match node.kind() {
"identifier" => {
let byte_range = node.byte_range();
let identifier = &source[byte_range];
Self::Identifier(identifier.to_string())
}
"value" => Expression::Value(Value::new(node, source)?),
"control_flow" => Expression::ControlFlow(Box::new(ControlFlow::new(node, source)?)),
"assignment" => Expression::Assignment(Box::new(Assignment::new(node, source)?)),
"math" => Expression::Math(Box::new(Math::new(node, source)?)),
_ => {
return Err(Error::UnexpectedSyntax {
expected: "identifier, operation, control_flow, assignment, math or value",
actual: node.kind(),
location: node.start_position(),
})
}
};
Ok(expression)
}
fn run(&self, context: &mut VariableMap) -> Result<Value> {
match self {
Expression::Identifier(identifier) => {
let value = context.get_value(&identifier)?;
if let Some(value) = value {
Ok(value)
} else {
Ok(Value::Empty)
}
}
Expression::Value(value) => Ok(value.clone()),
Expression::ControlFlow(control_flow) => control_flow.run(context),
Expression::Assignment(_) => todo!(),
Expression::Math(math) => math.run(context),
}
}
}
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub struct ControlFlow {
if_expression: Expression,
then_statement: Statement,
else_statement: Option<Statement>,
}
impl EvaluatorTree for ControlFlow {
fn new(node: Node, source: &str) -> Result<Self> {
// Skip the child nodes for the keywords "if", "then" and "else".
let second_child = node.child(1).unwrap();
let fourth_child = node.child(3).unwrap();
let sixth_child = node.child(5);
let else_statement = if let Some(child) = sixth_child {
Some(Statement::new(child, source)?)
} else {
None
};
Ok(ControlFlow {
if_expression: Expression::new(second_child, source)?,
then_statement: Statement::new(fourth_child, source)?,
else_statement,
})
}
fn run(&self, context: &mut VariableMap) -> Result<Value> {
let if_boolean = self.if_expression.run(context)?.as_boolean()?;
if if_boolean {
self.then_statement.run(context)
} else if let Some(statement) = &self.else_statement {
statement.run(context)
} else {
Ok(Value::Empty)
}
}
}
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
@ -244,108 +382,6 @@ impl Assignment {
}
}
impl Expression {
pub fn new(node: Node, source: &str) -> Result<Self> {
let node = if node.kind() == "expression" {
node.child(0).unwrap()
} else {
node
};
if node.kind() == "identifier" {
let byte_range = node.byte_range();
let identifier = &source[byte_range];
Ok(Self::Identifier(identifier.to_string()))
} else if node.kind() == "value" {
Ok(Expression::Value(Value::new(node, source)?))
} else if node.kind() == "control_flow" {
Ok(Expression::ControlFlow(Box::new(ControlFlow::new(
node, source,
)?)))
} else if node.kind() == "assignment" {
Ok(Expression::Assignment(Box::new(Assignment::new(
node, source,
)?)))
} else {
Err(Error::UnexpectedSourceNode {
expected: "identifier, operation, control_flow, assignment or value",
actual: node.kind(),
location: node.start_position(),
})
}
}
pub fn run(
&self,
context: &mut VariableMap,
mut cursor: &mut TreeCursor,
source: &str,
) -> Result<Value> {
match self {
Expression::Identifier(identifier) => {
let value = context.get_value(&identifier)?;
if let Some(value) = value {
Ok(value)
} else {
Ok(Value::Empty)
}
}
Expression::Value(value) => Ok(value.clone()),
Expression::ControlFlow(control_flow) => control_flow.run(context, &mut cursor, source),
Expression::Assignment(_) => todo!(),
}
}
}
#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
pub struct ControlFlow {
if_expression: Expression,
then_statement: Statement,
else_statement: Option<Statement>,
}
impl ControlFlow {
fn new(node: Node, source: &str) -> Result<Self> {
// Skip the child nodes for the keywords "if", "then" and "else".
let second_child = node.child(1).unwrap();
let fourth_child = node.child(3).unwrap();
let sixth_child = node.child(5);
let else_statement = if let Some(child) = sixth_child {
Some(Statement::new(child, source)?)
} else {
None
};
Ok(ControlFlow {
if_expression: Expression::new(second_child, source)?,
then_statement: Statement::new(fourth_child, source)?,
else_statement,
})
}
fn run(
&self,
context: &mut VariableMap,
mut cursor: &mut TreeCursor,
source: &str,
) -> Result<Value> {
let if_boolean = self
.if_expression
.run(context, &mut cursor, source)?
.as_boolean()?;
if if_boolean {
self.then_statement.run(context, &mut cursor, source)
} else if let Some(statement) = &self.else_statement {
statement.run(context, &mut cursor, source)
} else {
Ok(Value::Empty)
}
}
}
#[cfg(test)]
mod tests {
use crate::Table;

4
src/value/mod.rs
View File

@ -1,7 +1,7 @@
//! Types that represent runtime values.
use crate::{
error::{Error, Result},
Expression, Function, Statement, Table, Time, ValueType, VariableMap,
EvaluatorTree, Expression, Function, Statement, Table, Time, ValueType, VariableMap,
};
use json::JsonValue;
@ -184,7 +184,7 @@ impl Value {
Ok(Value::Function(Function::new(identifiers, statements)))
}
"empty" => Ok(Value::Empty),
_ => Err(Error::UnexpectedSourceNode {
_ => Err(Error::UnexpectedSyntax {
expected: "integer, string, boolean, float, list or empty",
actual: node.kind(),
location: node.start_position(),