160 lines
4.0 KiB
Rust
160 lines
4.0 KiB
Rust
use crate::common::*;
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use CompilationErrorKind::*;
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pub(crate) struct AssignmentResolver<'src: 'run, 'run> {
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assignments: &'run Table<'src, Assignment<'src>>,
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stack: Vec<&'src str>,
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seen: BTreeSet<&'src str>,
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evaluated: BTreeSet<&'src str>,
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}
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impl<'src: 'run, 'run> AssignmentResolver<'src, 'run> {
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pub(crate) fn resolve_assignments(
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assignments: &Table<'src, Assignment<'src>>,
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) -> CompilationResult<'src, ()> {
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let mut resolver = AssignmentResolver {
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stack: empty(),
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seen: empty(),
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evaluated: empty(),
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assignments,
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};
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for name in assignments.keys() {
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resolver.resolve_assignment(name)?;
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}
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Ok(())
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}
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fn resolve_assignment(&mut self, name: &'src str) -> CompilationResult<'src, ()> {
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if self.evaluated.contains(name) {
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return Ok(());
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}
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self.seen.insert(name);
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self.stack.push(name);
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if let Some(assignment) = self.assignments.get(name) {
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self.resolve_expression(&assignment.value)?;
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self.evaluated.insert(name);
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} else {
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let message = format!("attempted to resolve unknown assignment `{}`", name);
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let token = Token {
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src: "",
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offset: 0,
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line: 0,
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column: 0,
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length: 0,
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kind: TokenKind::Unspecified,
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};
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return Err(CompilationError {
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kind: Internal { message },
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token,
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});
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}
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Ok(())
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}
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fn resolve_expression(&mut self, expression: &Expression<'src>) -> CompilationResult<'src, ()> {
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match expression {
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Expression::Variable { name } => {
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let variable = name.lexeme();
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if self.evaluated.contains(variable) {
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Ok(())
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} else if self.seen.contains(variable) {
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let token = self.assignments[variable].name.token();
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self.stack.push(variable);
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Err(token.error(CircularVariableDependency {
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variable,
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circle: self.stack.clone(),
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}))
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} else if self.assignments.contains_key(variable) {
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self.resolve_assignment(variable)
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} else {
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Err(name.token().error(UndefinedVariable { variable }))
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}
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}
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Expression::Call { thunk } => match thunk {
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Thunk::Nullary { .. } => Ok(()),
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Thunk::Unary { arg, .. } => self.resolve_expression(arg),
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Thunk::Binary { args: [a, b], .. } => {
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self.resolve_expression(a)?;
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self.resolve_expression(b)
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}
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},
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Expression::Concatination { lhs, rhs } => {
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self.resolve_expression(lhs)?;
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self.resolve_expression(rhs)
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}
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Expression::StringLiteral { .. } | Expression::Backtick { .. } => Ok(()),
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Expression::Group { contents } => self.resolve_expression(contents),
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}
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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analysis_error! {
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name: circular_variable_dependency,
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input: "a = b\nb = a",
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offset: 0,
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line: 0,
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column: 0,
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width: 1,
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kind: CircularVariableDependency{variable: "a", circle: vec!["a", "b", "a"]},
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}
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analysis_error! {
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name: self_variable_dependency,
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input: "a = a",
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offset: 0,
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line: 0,
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column: 0,
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width: 1,
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kind: CircularVariableDependency{variable: "a", circle: vec!["a", "a"]},
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}
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analysis_error! {
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name: unknown_expression_variable,
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input: "x = yy",
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offset: 4,
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line: 0,
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column: 4,
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width: 2,
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kind: UndefinedVariable{variable: "yy"},
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}
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analysis_error! {
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name: unknown_function_parameter,
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input: "x := env_var(yy)",
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offset: 13,
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line: 0,
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column: 13,
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width: 2,
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kind: UndefinedVariable{variable: "yy"},
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}
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analysis_error! {
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name: unknown_function_parameter_binary_first,
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input: "x := env_var_or_default(yy, 'foo')",
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offset: 24,
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line: 0,
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column: 24,
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width: 2,
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kind: UndefinedVariable{variable: "yy"},
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}
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analysis_error! {
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name: unknown_function_parameter_binary_second,
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input: "x := env_var_or_default('foo', yy)",
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offset: 31,
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line: 0,
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column: 31,
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width: 2,
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kind: UndefinedVariable{variable: "yy"},
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}
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}
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