Continue syntax overhaul
This commit is contained in:
parent
6bab3db5e5
commit
a691b1fa34
12
src/error.rs
12
src/error.rs
@ -9,14 +9,14 @@ use std::{fmt, io, time::SystemTimeError};
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pub type Result<T> = std::result::Result<T, Error>;
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#[derive(Debug, Clone, PartialEq)]
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#[derive(Clone, PartialEq)]
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#[non_exhaustive]
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pub enum Error {
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UnexpectedSyntax {
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expected: &'static str,
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actual: &'static str,
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location: tree_sitter::Point,
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surrounding_text: String,
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relevant_source: String,
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},
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ExpectedFieldName,
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@ -390,6 +390,12 @@ pub fn expect_number_or_string(actual: &Value) -> Result<()> {
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impl std::error::Error for Error {}
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impl fmt::Debug for Error {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "{self}")
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}
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}
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impl fmt::Display for Error {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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use Error::*;
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@ -531,7 +537,7 @@ impl fmt::Display for Error {
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expected,
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actual,
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location,
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surrounding_text,
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relevant_source: surrounding_text,
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} => write!(
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f,
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"Unexpected syntax at {location}. Expected {expected}, but found {actual}.
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201
src/interface.rs
201
src/interface.rs
@ -150,7 +150,7 @@ impl EvaluatorTree for Item {
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expected: "comment or statement",
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actual: child.kind(),
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location: child.start_position(),
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surrounding_text: source[node.byte_range()].to_string(),
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relevant_source: source[node.byte_range()].to_string(),
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})
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}
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}
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@ -166,43 +166,46 @@ impl EvaluatorTree for Item {
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/// Abstract representation of a statement.
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///
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/// Items are either comments, which do nothing, or statements, which can be run
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/// to produce a single value or interact with a context by creating or
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/// referencing variables.
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/// to produce a single value or interact with their context.
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub enum Statement {
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Expression(Expression),
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ControlFlow(Box<ControlFlow>),
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Assignment(Box<Assignment>),
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Expression(Expression),
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IfElse(Box<IfElse>),
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Match(Match),
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}
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impl EvaluatorTree for Statement {
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fn from_syntax_node(node: Node, source: &str) -> Result<Self> {
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debug_assert_eq!("statement", node.kind());
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let child = node.child(0).unwrap();
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match child.kind() {
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"expression" => Ok(Self::Expression(Expression::from_syntax_node(
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child, source,
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)?)),
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"control_flow" => Ok(Statement::ControlFlow(Box::new(
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ControlFlow::from_syntax_node(child, source)?,
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))),
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"assignment" => Ok(Statement::Assignment(Box::new(
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Assignment::from_syntax_node(child, source)?,
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))),
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"expression" => Ok(Self::Expression(Expression::from_syntax_node(
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child, source,
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)?)),
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"if_else" => Ok(Statement::IfElse(Box::new(IfElse::from_syntax_node(
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child, source,
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)?))),
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_ => Err(Error::UnexpectedSyntax {
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expected: "expression",
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expected: "assignment, expression or if...else",
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actual: child.kind(),
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location: child.start_position(),
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surrounding_text: source[node.byte_range()].to_string(),
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relevant_source: source[node.byte_range()].to_string(),
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}),
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}
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}
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fn run(&self, context: &mut VariableMap) -> Result<Value> {
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match self {
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Statement::Expression(expression) => expression.run(context),
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Statement::ControlFlow(control_flow) => control_flow.run(context),
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Statement::Assignment(assignment) => assignment.run(context),
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Statement::Expression(expression) => expression.run(context),
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Statement::IfElse(if_else) => if_else.run(context),
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Statement::Match(r#match) => r#match.run(context),
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}
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}
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}
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@ -212,6 +215,7 @@ pub enum Expression {
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Identifier(Identifier),
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Value(Value),
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Math(Box<Math>),
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Logic(Box<Logic>),
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FunctionCall(FunctionCall),
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}
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@ -220,19 +224,21 @@ impl EvaluatorTree for Expression {
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let child = node.child(0).unwrap();
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let expression = match child.kind() {
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"identifier" => Self::Identifier(Identifier::from_syntax_node(child, source)?),
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"value" => Expression::Value(Value::from_syntax_node(child, source)?),
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"identifier" => Self::Identifier(Identifier::from_syntax_node(child, source)?),
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"math" => Expression::Math(Box::new(Math::from_syntax_node(child, source)?)),
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"logic" => Expression::Logic(Box::new(Logic::from_syntax_node(child, source)?)),
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"function_call" => {
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Expression::FunctionCall(FunctionCall::from_syntax_node(child, source)?)
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}
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_ => return Err(Error::UnexpectedSyntax {
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expected:
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"identifier, operation, control_flow, assignment, math, function_call or value",
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actual: child.kind(),
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location: child.start_position(),
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surrounding_text: source[node.byte_range()].to_string(),
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}),
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_ => {
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return Err(Error::UnexpectedSyntax {
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expected: "value, identifier, math or function_call",
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actual: child.kind(),
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location: child.start_position(),
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relevant_source: source[node.byte_range()].to_string(),
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})
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}
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};
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Ok(expression)
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@ -244,6 +250,7 @@ impl EvaluatorTree for Expression {
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Expression::Identifier(identifier) => identifier.run(context),
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Expression::Math(math) => math.run(context),
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Expression::FunctionCall(function_call) => function_call.run(context),
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Expression::Logic(logic) => logic.run(context),
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}
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}
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}
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@ -280,13 +287,13 @@ impl EvaluatorTree for Identifier {
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct ControlFlow {
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pub struct IfElse {
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if_expression: Expression,
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then_statement: Statement,
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else_statement: Option<Statement>,
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}
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impl EvaluatorTree for ControlFlow {
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impl EvaluatorTree for IfElse {
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fn from_syntax_node(node: Node, source: &str) -> Result<Self> {
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let if_node = node.child(1).unwrap();
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let if_expression = Expression::from_syntax_node(if_node, source)?;
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@ -301,7 +308,9 @@ impl EvaluatorTree for ControlFlow {
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None
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};
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Ok(ControlFlow {
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println!("{if_node:?} {then_node:?} {else_node:?}");
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Ok(IfElse {
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if_expression,
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then_statement,
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else_statement,
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@ -321,10 +330,23 @@ impl EvaluatorTree for ControlFlow {
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}
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct Match {}
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impl EvaluatorTree for Match {
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fn from_syntax_node(node: Node, source: &str) -> Result<Self> {
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todo!()
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}
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fn run(&self, context: &mut VariableMap) -> Result<Value> {
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todo!()
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}
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct Assignment {
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identifier: Identifier,
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expression: Expression,
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statement: Statement,
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}
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impl EvaluatorTree for Assignment {
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@ -332,18 +354,18 @@ impl EvaluatorTree for Assignment {
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let identifier_node = node.child(0).unwrap();
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let identifier = Identifier::from_syntax_node(identifier_node, source)?;
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let expression_node = node.child(2).unwrap();
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let expression = Expression::from_syntax_node(expression_node, source)?;
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let statement_node = node.child(2).unwrap();
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let statement = Statement::from_syntax_node(statement_node, source)?;
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Ok(Assignment {
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identifier,
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expression,
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statement,
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})
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}
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fn run(&self, context: &mut VariableMap) -> Result<Value> {
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let key = self.identifier.clone().take_inner();
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let value = self.expression.run(context)?;
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let value = self.statement.run(context)?;
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context.set_value(key, value)?;
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@ -375,7 +397,7 @@ impl EvaluatorTree for Math {
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expected: "+, -, *, / or %",
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actual: operator_node.kind(),
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location: operator_node.start_position(),
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surrounding_text: source[operator_node.byte_range()].to_string(),
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relevant_source: source[operator_node.byte_range()].to_string(),
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})
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}
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};
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@ -391,17 +413,31 @@ impl EvaluatorTree for Math {
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}
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fn run(&self, context: &mut VariableMap) -> Result<Value> {
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let left_value = self.left.run(context)?.as_number()?;
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let right_value = self.right.run(context)?.as_number()?;
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let outcome = match self.operator {
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MathOperator::Add => left_value + right_value,
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MathOperator::Subtract => left_value - right_value,
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MathOperator::Multiply => left_value * right_value,
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MathOperator::Divide => left_value / right_value,
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MathOperator::Modulo => left_value % right_value,
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};
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match self.operator {
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MathOperator::Add | MathOperator::Subtract | MathOperator::Multiply => {
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let left_value = self.left.run(context)?.as_int()?;
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let right_value = self.right.run(context)?.as_int()?;
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let outcome = match &self.operator {
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MathOperator::Add => left_value + right_value,
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MathOperator::Subtract => left_value - right_value,
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MathOperator::Multiply => left_value * right_value,
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_ => panic!("Unreachable"),
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};
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Ok(Value::Float(outcome))
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Ok(Value::Integer(outcome))
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}
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MathOperator::Divide | MathOperator::Modulo => {
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let left_value = self.left.run(context)?.as_number()?;
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let right_value = self.right.run(context)?.as_number()?;
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let outcome = match self.operator {
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MathOperator::Divide => left_value / right_value,
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MathOperator::Modulo => left_value % right_value,
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_ => panic!("Unreachable"),
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};
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Ok(Value::Float(outcome))
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}
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}
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}
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}
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@ -414,6 +450,63 @@ pub enum MathOperator {
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Modulo,
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct Logic {
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left: Expression,
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operator: LogicOperator,
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right: Expression,
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}
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impl EvaluatorTree for Logic {
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fn from_syntax_node(node: Node, source: &str) -> Result<Self> {
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let left_node = node.child(0).unwrap();
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let left = Expression::from_syntax_node(left_node, source)?;
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let operator_node = node.child(1).unwrap().child(0).unwrap();
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let operator = match operator_node.kind() {
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"==" => LogicOperator::Equal,
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"&&" => LogicOperator::And,
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"||" => LogicOperator::Or,
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_ => {
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return Err(Error::UnexpectedSyntax {
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expected: "==, && or ||",
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actual: operator_node.kind(),
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location: operator_node.start_position(),
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relevant_source: source[operator_node.byte_range()].to_string(),
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})
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}
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};
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let right_node = node.child(2).unwrap();
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let right = Expression::from_syntax_node(right_node, source)?;
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Ok(Logic {
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left,
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operator,
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right,
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})
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}
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fn run(&self, context: &mut VariableMap) -> Result<Value> {
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let left_value = self.left.run(context)?;
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let right_value = self.right.run(context)?;
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let outcome = match self.operator {
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LogicOperator::Equal => left_value == right_value,
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LogicOperator::And => left_value.as_boolean()? && right_value.as_boolean()?,
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LogicOperator::Or => left_value.as_boolean()? || right_value.as_boolean()?,
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};
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Ok(Value::Boolean(outcome))
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}
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub enum LogicOperator {
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Equal,
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And,
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Or,
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}
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#[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
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pub struct FunctionCall {
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identifier: Identifier,
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@ -574,13 +667,13 @@ mod tests {
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}
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#[test]
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fn evaluate_if_else_if_then_else() {
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fn evaluate_if_else_else_if_else() {
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assert_eq!(
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evaluate(
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"
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if false
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then 'no'
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else if 1 + 1 = 3
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else if 1 + 1 == 3
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then 'nope'
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else
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'ok'
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@ -588,9 +681,25 @@ mod tests {
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),
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vec![Ok(Value::String("ok".to_string()))]
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);
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}
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#[test]
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fn evaluate_if_else_else_if_else_if_else_if_else() {
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assert_eq!(
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evaluate("if true then 1.0 else 42.0"),
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vec![Ok(Value::Float(1.0))]
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evaluate(
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"
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if false
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then 'no'
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else if 1 + 1 == 1
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then 'nope'
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else if 9 / 2 == 4
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then 'nope'
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else if 'foo' == 'bar'
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then 'nope'
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else 'ok'
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"
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),
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vec![Ok(Value::String("ok".to_string()))]
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);
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}
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@ -183,7 +183,7 @@ impl Value {
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expected: "string, integer, float, boolean, list, table, map, function or empty",
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actual: child.kind(),
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location: child.start_position(),
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surrounding_text: source[child.byte_range()].to_string(),
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relevant_source: source[child.byte_range()].to_string(),
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}),
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}
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}
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@ -1 +1 @@
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Subproject commit 4ddc65645541293ca2690c874b0ac8eb62f7e5e4
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Subproject commit 405a2dc86c75617daa567781469708b0aaf0a0c0
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Block a user