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//! Statement validation helpers used by statement callbacks.
use crate::state::CheckerState;
use crate::statements::StatementCheckCallbacks;
use tsz_parser::parser::NodeIndex;
use tsz_parser::parser::syntax_kind_ext;
impl<'a> CheckerState<'a> {
pub(crate) fn check_declare_modifiers_in_ambient_body(&mut self, body_idx: NodeIndex) {
use crate::diagnostics::diagnostic_codes;
use tsz_parser::parser::syntax_kind_ext;
let Some(body_node) = self.ctx.arena.get(body_idx) else {
return;
};
if body_node.kind != syntax_kind_ext::MODULE_BLOCK {
return;
}
let Some(block) = self.ctx.arena.get_module_block(body_node) else {
return;
};
let Some(ref statements) = block.statements else {
return;
};
for &stmt_idx in &statements.nodes {
let Some(stmt_node) = self.ctx.arena.get(stmt_idx) else {
continue;
};
// Check different declaration types for 'declare' modifier
let modifiers = match stmt_node.kind {
syntax_kind_ext::FUNCTION_DECLARATION => {
self.ctx.arena.get_function(stmt_node).map(|f| &f.modifiers)
}
syntax_kind_ext::VARIABLE_STATEMENT => {
self.ctx.arena.get_variable(stmt_node).map(|v| &v.modifiers)
}
syntax_kind_ext::CLASS_DECLARATION => {
self.ctx.arena.get_class(stmt_node).map(|c| &c.modifiers)
}
syntax_kind_ext::INTERFACE_DECLARATION => self
.ctx
.arena
.get_interface(stmt_node)
.map(|i| &i.modifiers),
syntax_kind_ext::TYPE_ALIAS_DECLARATION => self
.ctx
.arena
.get_type_alias(stmt_node)
.map(|t| &t.modifiers),
syntax_kind_ext::ENUM_DECLARATION => {
self.ctx.arena.get_enum(stmt_node).map(|e| &e.modifiers)
}
syntax_kind_ext::MODULE_DECLARATION => {
self.ctx.arena.get_module(stmt_node).map(|m| &m.modifiers)
}
_ => None,
};
if let Some(mods) = modifiers
&& let Some(declare_mod) = self.get_declare_modifier(mods)
{
self.error_at_node(
declare_mod,
"A 'declare' modifier cannot be used in an already ambient context.",
diagnostic_codes::A_DECLARE_MODIFIER_CANNOT_BE_USED_IN_AN_ALREADY_AMBIENT_CONTEXT,
);
}
}
}
/// TS1039: Check for variable initializers in ambient contexts.
/// This is checked even when we skip full type checking of ambient module bodies.
pub(crate) fn check_initializers_in_ambient_body(&mut self, body_idx: NodeIndex) {
use crate::diagnostics::{diagnostic_codes, diagnostic_messages};
use tsz_parser::parser::syntax_kind_ext;
let Some(body_node) = self.ctx.arena.get(body_idx) else {
return;
};
if body_node.kind != syntax_kind_ext::MODULE_BLOCK {
return;
}
let Some(block) = self.ctx.arena.get_module_block(body_node) else {
return;
};
let Some(ref statements) = block.statements else {
return;
};
for &stmt_idx in &statements.nodes {
let Some(stmt_node) = self.ctx.arena.get(stmt_idx) else {
continue;
};
// Get the actual variable statement - it might be wrapped in an export declaration
// For example: export var x = 1; is parsed as EXPORT_DECLARATION with export_clause pointing to VARIABLE_STATEMENT
let var_stmt_node = if stmt_node.kind == syntax_kind_ext::EXPORT_DECLARATION {
if let Some(export_decl) = self.ctx.arena.get_export_decl(stmt_node) {
if export_decl.export_clause.is_none() {
continue;
}
let Some(clause_node) = self.ctx.arena.get(export_decl.export_clause) else {
continue;
};
clause_node
} else {
continue;
}
} else if stmt_node.kind == syntax_kind_ext::VARIABLE_STATEMENT {
stmt_node
} else {
continue;
};
// Check variable statements for initializers
if var_stmt_node.kind == syntax_kind_ext::VARIABLE_STATEMENT
&& let Some(var_stmt) = self.ctx.arena.get_variable(var_stmt_node)
{
// var_stmt.declarations.nodes contains VariableDeclarationList nodes
// We need to get each list and then iterate its declarations
for &list_idx in &var_stmt.declarations.nodes {
if let Some(list_node) = self.ctx.arena.get(list_idx)
&& let Some(decl_list) = self.ctx.arena.get_variable(list_node)
{
use tsz_parser::parser::node_flags;
let is_const = (list_node.flags & node_flags::CONST as u16) != 0;
for &decl_idx in &decl_list.declarations.nodes {
if let Some(decl_node) = self.ctx.arena.get(decl_idx)
&& let Some(var_decl) =
self.ctx.arena.get_variable_declaration(decl_node)
&& var_decl.initializer.is_some()
{
if is_const && var_decl.type_annotation.is_none() {
// const without type annotation: only string/numeric literals allowed
// TS1254 if initializer is not a valid literal
if !self.is_valid_const_initializer(var_decl.initializer) {
self.error_at_node(
var_decl.initializer,
diagnostic_messages::A_CONST_INITIALIZER_IN_AN_AMBIENT_CONTEXT_MUST_BE_A_STRING_OR_NUMERIC_LITERAL_OR,
diagnostic_codes::A_CONST_INITIALIZER_IN_AN_AMBIENT_CONTEXT_MUST_BE_A_STRING_OR_NUMERIC_LITERAL_OR,
);
}
// else: valid literal initializer, no error
} else {
// Non-const or const with type annotation: TS1039
self.error_at_node(
var_decl.initializer,
diagnostic_messages::INITIALIZERS_ARE_NOT_ALLOWED_IN_AMBIENT_CONTEXTS,
diagnostic_codes::INITIALIZERS_ARE_NOT_ALLOWED_IN_AMBIENT_CONTEXTS,
);
}
}
}
}
}
}
// Recursively check nested modules/namespaces
if stmt_node.kind == syntax_kind_ext::MODULE_DECLARATION
&& let Some(module) = self.ctx.arena.get_module(stmt_node)
&& module.body.is_some()
{
self.check_initializers_in_ambient_body(module.body);
}
}
}
/// Check if a node is a valid const initializer in an ambient context.
/// Valid initializers are string literals, numeric literals, or negative numeric literals.
fn is_valid_const_initializer(&self, init_idx: NodeIndex) -> bool {
self.is_valid_ambient_const_initializer(init_idx)
}
/// Check a break statement for validity.
/// Check a with statement and emit TS2410.
/// The 'with' statement is not supported in TypeScript.
pub(crate) fn check_with_statement(&mut self, stmt_idx: NodeIndex) {
use crate::diagnostics::{diagnostic_codes, diagnostic_messages};
self.error_at_node(
stmt_idx,
diagnostic_messages::THE_WITH_STATEMENT_IS_NOT_SUPPORTED_ALL_SYMBOLS_IN_A_WITH_BLOCK_WILL_HAVE_TYPE_A,
diagnostic_codes::THE_WITH_STATEMENT_IS_NOT_SUPPORTED_ALL_SYMBOLS_IN_A_WITH_BLOCK_WILL_HAVE_TYPE_A,
);
if self.ctx.in_async_context() {
self.error_at_node(
stmt_idx,
diagnostic_messages::WITH_STATEMENTS_ARE_NOT_ALLOWED_IN_AN_ASYNC_FUNCTION_BLOCK,
diagnostic_codes::WITH_STATEMENTS_ARE_NOT_ALLOWED_IN_AN_ASYNC_FUNCTION_BLOCK,
);
}
if self.is_with_statement_in_strict_mode_context(stmt_idx) {
self.error_at_node(
stmt_idx,
diagnostic_messages::WITH_STATEMENTS_ARE_NOT_ALLOWED_IN_STRICT_MODE,
diagnostic_codes::WITH_STATEMENTS_ARE_NOT_ALLOWED_IN_STRICT_MODE,
);
}
// Type-check the with-expression for name resolution (TS2304).
if let Some(node) = self.ctx.arena.get(stmt_idx)
&& let Some(with_data) = self.ctx.arena.get_with_statement(node)
{
self.get_type_of_node(with_data.expression);
}
}
fn is_with_statement_in_strict_mode_context(&self, stmt_idx: NodeIndex) -> bool {
if self.ctx.compiler_options.always_strict {
return true;
}
let mut current = stmt_idx;
while let Some(ext) = self.ctx.arena.get_extended(current) {
let parent_idx = ext.parent;
if parent_idx.is_none() {
return false;
}
let Some(parent_node) = self.ctx.arena.get(parent_idx) else {
return false;
};
if parent_node.kind == syntax_kind_ext::CLASS_DECLARATION
|| parent_node.kind == syntax_kind_ext::CLASS_EXPRESSION
|| parent_node.kind == syntax_kind_ext::METHOD_DECLARATION
|| parent_node.kind == syntax_kind_ext::GET_ACCESSOR
|| parent_node.kind == syntax_kind_ext::SET_ACCESSOR
|| parent_node.kind == syntax_kind_ext::CONSTRUCTOR
|| parent_node.kind == syntax_kind_ext::CLASS_STATIC_BLOCK_DECLARATION
{
return true;
}
current = parent_idx;
}
false
}
/// TS1105: A 'break' statement can only be used within an enclosing iteration statement or switch statement.
/// TS1107: Jump target cannot cross function boundary.
/// TS1116: A 'break' statement can only jump to a label of an enclosing statement.
pub(crate) fn check_break_statement(&mut self, stmt_idx: NodeIndex) {
use crate::diagnostics::diagnostic_codes;
// In .d.ts files, TS1036 is emitted instead of TS1105
if self.ctx.is_in_ambient_declaration_file {
return;
}
// Like TSC's grammarErrorOnNode, suppress all grammar errors (TS1105, TS1107, TS1116)
// for break/continue when the file has parser-generated syntax errors.
// TSC checks hasParseDiagnostics(sourceFile) before emitting these grammar errors.
if self.has_syntax_parse_errors() {
return;
}
// Get the label if any
let label_name = self
.ctx
.arena
.get(stmt_idx)
.and_then(|node| self.ctx.arena.get_jump_data(node))
.and_then(|jump_data| {
if jump_data.label.is_none() {
None
} else {
self.get_node_text(jump_data.label)
}
});
if let Some(label) = label_name {
// Labeled break - look up the label
if let Some(label_info) = self.find_label(&label) {
// Check if the label crosses a function boundary
if label_info.function_depth < self.ctx.function_depth {
self.error_at_node(
stmt_idx,
"Jump target cannot cross function boundary.",
diagnostic_codes::JUMP_TARGET_CANNOT_CROSS_FUNCTION_BOUNDARY,
);
}
// Otherwise, labeled break is valid (can target any label, not just iteration)
} else {
// Label not found - emit TS1116
self.error_at_node(
stmt_idx,
"A 'break' statement can only jump to a label of an enclosing statement.",
diagnostic_codes::A_BREAK_STATEMENT_CAN_ONLY_JUMP_TO_A_LABEL_OF_AN_ENCLOSING_STATEMENT,
);
}
} else {
// Unlabeled break - must be inside iteration or switch
if self.ctx.iteration_depth == 0 && self.ctx.switch_depth == 0 {
// Check if we're inside a function that's inside a loop
// If so, emit TS1107 (crossing function boundary) instead of TS1105
if self.ctx.function_depth > 0 && self.ctx.had_outer_loop {
self.error_at_node(
stmt_idx,
"Jump target cannot cross function boundary.",
diagnostic_codes::JUMP_TARGET_CANNOT_CROSS_FUNCTION_BOUNDARY,
);
} else {
self.error_at_node(
stmt_idx,
"A 'break' statement can only be used within an enclosing iteration or switch statement.",
diagnostic_codes::A_BREAK_STATEMENT_CAN_ONLY_BE_USED_WITHIN_AN_ENCLOSING_ITERATION_OR_SWITCH_STATE,
);
}
}
}
}
/// Check a continue statement for validity.
/// TS1104: A 'continue' statement can only be used within an enclosing iteration statement.
/// TS1107: Jump target cannot cross function boundary.
/// TS1116: A 'continue' statement can only jump to a label of an enclosing iteration statement.
pub(crate) fn check_continue_statement(&mut self, stmt_idx: NodeIndex) {
use crate::diagnostics::diagnostic_codes;
// In .d.ts files, TS1036 is emitted instead of TS1104
if self.ctx.is_in_ambient_declaration_file {
return;
}
// Like TSC's grammarErrorOnNode, suppress grammar errors (TS1104, TS1107, TS1115)
// for continue when the file has parser-generated syntax errors.
if self.has_syntax_parse_errors() {
return;
}
// Get the label if any
let label_name = self
.ctx
.arena
.get(stmt_idx)
.and_then(|node| self.ctx.arena.get_jump_data(node))
.and_then(|jump_data| {
if jump_data.label.is_none() {
None
} else {
self.get_node_text(jump_data.label)
}
});
if let Some(label) = label_name {
// Labeled continue - look up the label
if let Some(label_info) = self.find_label(&label) {
// Check if the label crosses a function boundary
if label_info.function_depth < self.ctx.function_depth {
self.error_at_node(
stmt_idx,
"Jump target cannot cross function boundary.",
diagnostic_codes::JUMP_TARGET_CANNOT_CROSS_FUNCTION_BOUNDARY,
);
} else if !label_info.is_iteration {
// Continue can only target iteration labels (label found but not on loop) - TS1115
self.error_at_node(
stmt_idx,
"A 'continue' statement can only target a label of an enclosing iteration statement.",
diagnostic_codes::A_CONTINUE_STATEMENT_CAN_ONLY_JUMP_TO_A_LABEL_OF_AN_ENCLOSING_ITERATION_STATEMEN,
);
}
// Otherwise, labeled continue to iteration label is valid
} else {
// Label not found - emit TS1115 (same as when label exists but not on iteration)
self.error_at_node(
stmt_idx,
"A 'continue' statement can only target a label of an enclosing iteration statement.",
diagnostic_codes::A_CONTINUE_STATEMENT_CAN_ONLY_JUMP_TO_A_LABEL_OF_AN_ENCLOSING_ITERATION_STATEMEN,
);
}
} else {
// Unlabeled continue - must be inside iteration
if self.ctx.iteration_depth == 0 {
// Check if we're inside a function that's inside a loop
// If so, emit TS1107 (crossing function boundary) instead of TS1104
if self.ctx.function_depth > 0 && self.ctx.had_outer_loop {
self.error_at_node(
stmt_idx,
"Jump target cannot cross function boundary.",
diagnostic_codes::JUMP_TARGET_CANNOT_CROSS_FUNCTION_BOUNDARY,
);
} else {
self.error_at_node(
stmt_idx,
"A 'continue' statement can only be used within an enclosing iteration statement.",
diagnostic_codes::A_CONTINUE_STATEMENT_CAN_ONLY_BE_USED_WITHIN_AN_ENCLOSING_ITERATION_STATEMENT,
);
}
}
}
}
/// Find a label in the label stack by name.
fn find_label(&self, name: &str) -> Option<&crate::context::LabelInfo> {
self.ctx
.label_stack
.iter()
.rev()
.find(|info| info.name == name)
}
}