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Shell: Add runtime errors and implement break/continue

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Such errors are raised when SyntaxError nodes are executed, and are also
used for internal control flow.
The 'break' and 'continue' commands are currently only allowed inside
for loops, and outside function bodies.

This also adds a 'loop' keyword for infinite loops.
This commit is contained in:
AnotherTest 2020-12-10 18:25:13 +03:30 • committed by Andreas Kling
parent 9bd81f34a5
commit 5e5eb615ec
14 changed files with 384 additions and 62 deletions
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22
Shell/Parser.h
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@ -61,7 +61,9 @@ private:
RefPtr<AST::Node> parse_pipe_sequence();
RefPtr<AST::Node> parse_command();
RefPtr<AST::Node> parse_control_structure();
RefPtr<AST::Node> parse_continuation_control();
RefPtr<AST::Node> parse_for_loop();
RefPtr<AST::Node> parse_loop_loop();
RefPtr<AST::Node> parse_if_expr();
RefPtr<AST::Node> parse_subshell();
RefPtr<AST::Node> parse_match_expr();
@ -139,6 +141,7 @@ private:
Vector<AST::Position::Line> m_rule_start_lines;
bool m_is_in_brace_expansion_spec { false };
bool m_continuation_controls_allowed { false };
};
#if 0
@ -151,7 +154,7 @@ sequence :: variable_decls? or_logical_sequence terminator sequence
| variable_decls? function_decl (terminator sequence)?
| variable_decls? terminator sequence
function_decl :: identifier '(' (ws* identifier)* ')' ws* '{' toplevel '}'
function_decl :: identifier '(' (ws* identifier)* ')' ws* '{' [!c] toplevel '}'
or_logical_sequence :: and_logical_sequence '|' '|' and_logical_sequence
| and_logical_sequence
@ -170,12 +173,19 @@ pipe_sequence :: command '|' pipe_sequence
| control_structure '|' pipe_sequence
| control_structure
control_structure :: for_expr
| if_expr
| subshell
| match_expr
control_structure[c] :: for_expr
| loop_expr
| if_expr
| subshell
| match_expr
| ?c: continuation_control
for_expr :: 'for' ws+ (identifier ' '+ 'in' ws*)? expression ws+ '{' toplevel '}'
continuation_control :: 'break'
| 'continue'
for_expr :: 'for' ws+ (identifier ' '+ 'in' ws*)? expression ws+ '{' [c] toplevel '}'
loop_expr :: 'loop' ws* '{' [c] toplevel '}'
if_expr :: 'if' ws+ or_logical_sequence ws+ '{' toplevel '}' else_clause?