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Shell: Start implementing a POSIX-compliant parser
The parser is still very much a work-in-progress, but it can currently parse most of the basic bits, the only *completely* unimplemented things in the parser are: - heredocs (io_here) - alias expansion - arithmetic expansion There are a whole suite of bugs, and syntax highlighting is unreliable at best. For now, this is not attached anywhere, a future commit will enable it for /bin/sh or a `Shell --posix` invocation.
This commit is contained in:
Ali Mohammad Pur
Ali Mohammad Pur
parent
2dc1682274
commit
2a276c86d4
14 changed files with 3444 additions and 28 deletions
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@ -453,6 +453,161 @@ RefPtr<AST::Node> Shell::immediate_join(AST::ImmediateExpression& invoking_node,
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return AST::make_ref_counted<AST::StringLiteral>(invoking_node.position(), builder.to_deprecated_string(), AST::StringLiteral::EnclosureType::None);
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}
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RefPtr<AST::Node> Shell::immediate_value_or_default(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to value_or_default", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (!local_variable_or(name, ""sv).is_empty())
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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return arguments.last();
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}
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RefPtr<AST::Node> Shell::immediate_assign_default(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to assign_default", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (!local_variable_or(name, ""sv).is_empty())
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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auto value = const_cast<AST::Node&>(arguments.last()).run(*this)->resolve_without_cast(*this);
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set_local_variable(name, value);
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return make_ref_counted<AST::SyntheticNode>(invoking_node.position(), value);
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}
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RefPtr<AST::Node> Shell::immediate_error_if_empty(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to error_if_empty", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (!local_variable_or(name, ""sv).is_empty())
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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auto error_value = const_cast<AST::Node&>(arguments.last()).run(*this)->resolve_as_string(*this);
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if (error_value.is_empty())
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error_value = DeprecatedString::formatted("Expected {} to be non-empty", name);
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raise_error(ShellError::EvaluatedSyntaxError, error_value, invoking_node.position());
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return nullptr;
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}
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RefPtr<AST::Node> Shell::immediate_null_or_alternative(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to null_or_alternative", invoking_node.position());
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return nullptr;
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}
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auto value = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_without_cast(*this);
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if ((value->is_string() && value->resolve_as_string(*this).is_empty()) || (value->is_list() && value->resolve_as_list(*this).is_empty()))
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return make_ref_counted<AST::SyntheticNode>(invoking_node.position(), value);
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return arguments.last();
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}
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RefPtr<AST::Node> Shell::immediate_defined_value_or_default(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to defined_value_or_default", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (!find_frame_containing_local_variable(name))
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return arguments.last();
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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}
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RefPtr<AST::Node> Shell::immediate_assign_defined_default(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to assign_defined_default", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (find_frame_containing_local_variable(name))
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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auto value = const_cast<AST::Node&>(arguments.last()).run(*this)->resolve_without_cast(*this);
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set_local_variable(name, value);
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return make_ref_counted<AST::SyntheticNode>(invoking_node.position(), value);
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}
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RefPtr<AST::Node> Shell::immediate_error_if_unset(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to error_if_unset", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (find_frame_containing_local_variable(name))
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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auto error_value = const_cast<AST::Node&>(arguments.last()).run(*this)->resolve_as_string(*this);
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if (error_value.is_empty())
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error_value = DeprecatedString::formatted("Expected {} to be set", name);
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raise_error(ShellError::EvaluatedSyntaxError, error_value, invoking_node.position());
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return nullptr;
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}
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RefPtr<AST::Node> Shell::immediate_null_if_unset_or_alternative(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 2) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 2 arguments to null_if_unset_or_alternative", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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if (!find_frame_containing_local_variable(name))
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return arguments.last();
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return make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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}
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RefPtr<AST::Node> Shell::immediate_reexpand(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 1) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 1 argument to reexpand", invoking_node.position());
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return nullptr;
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}
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auto value = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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return parse(value, m_is_interactive, false);
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}
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RefPtr<AST::Node> Shell::immediate_length_of_variable(AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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if (arguments.size() != 1) {
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raise_error(ShellError::EvaluatedSyntaxError, "Expected exactly 1 argument to length_of_variable", invoking_node.position());
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return nullptr;
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}
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auto name = const_cast<AST::Node&>(arguments.first()).run(*this)->resolve_as_string(*this);
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auto variable = make_ref_counted<AST::SimpleVariable>(invoking_node.position(), name);
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return immediate_length_impl(
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invoking_node,
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{ move(variable) },
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false);
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}
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RefPtr<AST::Node> Shell::run_immediate_function(StringView str, AST::ImmediateExpression& invoking_node, NonnullRefPtrVector<AST::Node> const& arguments)
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{
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#define __ENUMERATE_SHELL_IMMEDIATE_FUNCTION(name) \
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