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Add import statement.

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Stephen Chung
2020-05-04 19:36:58 +08:00
parent b94fa31e21
commit 2bdd174f16
8 changed files with 239 additions and 105 deletions
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18
src/result.rs
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@@ -53,6 +53,8 @@ pub enum EvalAltResult {
ErrorNumericIndexExpr(Position),
/// Trying to index into a map with an index that is not `String`.
ErrorStringIndexExpr(Position),
/// Trying to import with an expression that is not `String`.
ErrorImportExpr(Position),
/// Invalid arguments for `in` operator.
ErrorInExpr(Position),
/// The guard expression in an `if` or `while` statement does not return a boolean value.
@@ -61,8 +63,8 @@ pub enum EvalAltResult {
ErrorFor(Position),
/// Usage of an unknown variable. Wrapped value is the name of the variable.
ErrorVariableNotFound(String, Position),
/// Usage of an unknown namespace. Wrapped value is the name of the namespace.
ErrorNamespaceNotFound(String, Position),
/// Usage of an unknown module. Wrapped value is the name of the module.
ErrorModuleNotFound(String, Position),
/// Assignment to an inappropriate LHS (left-hand-side) expression.
ErrorAssignmentToUnknownLHS(Position),
/// Assignment to a constant variable.
@@ -108,6 +110,7 @@ impl EvalAltResult {
Self::ErrorIndexingType(_, _) => {
"Indexing can only be performed on an array, an object map, or a string"
}
Self::ErrorImportExpr(_) => "Importing a module expects a string path",
Self::ErrorArrayBounds(_, index, _) if *index < 0 => {
"Array access expects non-negative index"
}
@@ -121,7 +124,7 @@ impl EvalAltResult {
Self::ErrorLogicGuard(_) => "Boolean value expected",
Self::ErrorFor(_) => "For loop expects an array, object map, or range",
Self::ErrorVariableNotFound(_, _) => "Variable not found",
Self::ErrorNamespaceNotFound(_, _) => "Namespace not found",
Self::ErrorModuleNotFound(_, _) => "module not found",
Self::ErrorAssignmentToUnknownLHS(_) => {
"Assignment to an unsupported left-hand side expression"
}
@@ -155,13 +158,14 @@ impl fmt::Display for EvalAltResult {
Self::ErrorFunctionNotFound(s, pos)
| Self::ErrorVariableNotFound(s, pos)
| Self::ErrorNamespaceNotFound(s, pos) => write!(f, "{}: '{}' ({})", desc, s, pos),
| Self::ErrorModuleNotFound(s, pos) => write!(f, "{}: '{}' ({})", desc, s, pos),
Self::ErrorDotExpr(s, pos) if !s.is_empty() => write!(f, "{} {} ({})", desc, s, pos),
Self::ErrorIndexingType(_, pos)
| Self::ErrorNumericIndexExpr(pos)
| Self::ErrorStringIndexExpr(pos)
| Self::ErrorImportExpr(pos)
| Self::ErrorLogicGuard(pos)
| Self::ErrorFor(pos)
| Self::ErrorAssignmentToUnknownLHS(pos)
@@ -270,10 +274,11 @@ impl EvalAltResult {
| Self::ErrorIndexingType(_, pos)
| Self::ErrorNumericIndexExpr(pos)
| Self::ErrorStringIndexExpr(pos)
| Self::ErrorImportExpr(pos)
| Self::ErrorLogicGuard(pos)
| Self::ErrorFor(pos)
| Self::ErrorVariableNotFound(_, pos)
| Self::ErrorNamespaceNotFound(_, pos)
| Self::ErrorModuleNotFound(_, pos)
| Self::ErrorAssignmentToUnknownLHS(pos)
| Self::ErrorAssignmentToConstant(_, pos)
| Self::ErrorMismatchOutputType(_, pos)
@@ -305,10 +310,11 @@ impl EvalAltResult {
| Self::ErrorIndexingType(_, pos)
| Self::ErrorNumericIndexExpr(pos)
| Self::ErrorStringIndexExpr(pos)
| Self::ErrorImportExpr(pos)
| Self::ErrorLogicGuard(pos)
| Self::ErrorFor(pos)
| Self::ErrorVariableNotFound(_, pos)
| Self::ErrorNamespaceNotFound(_, pos)
| Self::ErrorModuleNotFound(_, pos)
| Self::ErrorAssignmentToUnknownLHS(pos)
| Self::ErrorAssignmentToConstant(_, pos)
| Self::ErrorMismatchOutputType(_, pos)