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Shell: Start implementing a POSIX-compliant parser

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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 2023-02-11 17:59:15 +03:30 • committed by Ali Mohammad Pur
parent 2dc1682274
commit 2a276c86d4
Notes: sideshowbarker 2024-07-17 06:09:44 +09:00
14 changed files with 3444 additions and 28 deletions
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35
Userland/Shell/Shell.h
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@ -61,16 +61,26 @@
__ENUMERATE_SHELL_OPTION(verbose, false, "Announce every command that is about to be executed") \
__ENUMERATE_SHELL_OPTION(invoke_program_for_autocomplete, false, "Attempt to use the program being completed itself for autocompletion via --complete")
#define ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS() \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(concat_lists) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length_across) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(remove_suffix) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(remove_prefix) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(regex_replace) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(filter_glob) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(split) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(join)
#define ENUMERATE_SHELL_IMMEDIATE_FUNCTIONS() \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(concat_lists) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length_across) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(remove_suffix) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(remove_prefix) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(regex_replace) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(filter_glob) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(split) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(join) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(value_or_default) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(assign_default) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(error_if_empty) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(null_or_alternative) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(defined_value_or_default) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(assign_defined_default) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(error_if_unset) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(null_if_unset_or_alternative) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(length_of_variable) \
__ENUMERATE_SHELL_IMMEDIATE_FUNCTION(reexpand)
namespace Shell {
@ -376,10 +386,12 @@ public:
#undef __ENUMERATE_SHELL_OPTION
private:
Shell(Line::Editor&, bool attempt_interactive);
Shell(Line::Editor&, bool attempt_interactive, bool posix_mode = false);
Shell();
virtual ~Shell() override;
RefPtr<AST::Node> parse(StringView, bool interactive = false, bool as_command = true) const;
void timer_event(Core::TimerEvent&) override;
bool is_allowed_to_modify_termios(const AST::Command&) const;
@ -450,6 +462,7 @@ private:
bool m_is_interactive { true };
bool m_is_subshell { false };
bool m_should_reinstall_signal_handlers { true };
bool m_in_posix_mode { false };
ShellError m_error { ShellError::None };
DeprecatedString m_error_description;