mirror of
https://github.com/fish-shell/fish-shell
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125 lines
5.5 KiB
C++
125 lines
5.5 KiB
C++
/**\file parse_execution.h
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Provides the "linkage" between a parse_node_tree_t and actual execution structures (job_t, etc.).
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*/
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#ifndef FISH_PARSE_EXECUTION_H
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#define FISH_PARSE_EXECUTION_H
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#include "config.h"
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#include "util.h"
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#include "parse_tree.h"
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#include "proc.h"
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class job_t;
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struct block_t;
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enum parse_execution_result_t
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{
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/* The job was successfully executed (though it have failed on its own). */
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parse_execution_success,
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/* The job did not execute due to some error (e.g. failed to wildcard expand). An error will have been printed and proc_last_status will have been set. */
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parse_execution_errored,
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/* The job was cancelled (e.g. Ctrl-C) */
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parse_execution_cancelled,
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/* The job was skipped (e.g. due to a not-taken 'and' command). This is a special return allowed only from the populate functions, not the run functions. */
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parse_execution_skipped
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};
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class parse_execution_context_t
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{
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private:
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const parse_node_tree_t tree;
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const wcstring src;
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io_chain_t block_io;
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parser_t * const parser;
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//parse_error_list_t errors;
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int eval_level;
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/* The currently executing node index, used to indicate the line number */
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node_offset_t executing_node_idx;
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/* Cached line number information */
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size_t cached_lineno_offset;
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int cached_lineno_count;
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/* No copying allowed */
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parse_execution_context_t(const parse_execution_context_t&);
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parse_execution_context_t& operator=(const parse_execution_context_t&);
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/* Should I cancel? */
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bool should_cancel_execution(const block_t *block) const;
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/* Ways that we can stop executing a block. These are in a sort of ascending order of importance, e.g. `exit` should trump `break` */
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enum execution_cancellation_reason_t
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{
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execution_cancellation_none,
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execution_cancellation_loop_control,
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execution_cancellation_skip,
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execution_cancellation_exit
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};
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execution_cancellation_reason_t cancellation_reason(const block_t *block) const;
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/* Report an error. Always returns true. */
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parse_execution_result_t report_error(const parse_node_t &node, const wchar_t *fmt, ...);
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/* Wildcard error helper */
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parse_execution_result_t report_unmatched_wildcard_error(const parse_node_t &unmatched_wildcard);
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/* Command not found support */
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void handle_command_not_found(const wcstring &cmd, const parse_node_t &statement_node, int err_code);
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/* Utilities */
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wcstring get_source(const parse_node_t &node) const;
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const parse_node_t *get_child(const parse_node_t &parent, node_offset_t which, parse_token_type_t expected_type = token_type_invalid) const;
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node_offset_t get_offset(const parse_node_t &node) const;
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const parse_node_t *infinite_recursive_statement_in_job_list(const parse_node_t &job_list, wcstring *out_func_name) const;
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/* Indicates whether a job is a simple block (one block, no redirections) */
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bool job_is_simple_block(const parse_node_t &node) const;
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enum process_type_t process_type_for_command(const parse_node_t &plain_statement, const wcstring &cmd) const;
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/* These create process_t structures from statements */
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parse_execution_result_t populate_job_process(job_t *job, process_t *proc, const parse_node_t &statement_node);
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parse_execution_result_t populate_boolean_process(job_t *job, process_t *proc, const parse_node_t &bool_statement);
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parse_execution_result_t populate_plain_process(job_t *job, process_t *proc, const parse_node_t &statement);
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parse_execution_result_t populate_block_process(job_t *job, process_t *proc, const parse_node_t &statement_node);
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/* These encapsulate the actual logic of various (block) statements. */
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parse_execution_result_t run_block_statement(const parse_node_t &statement);
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parse_execution_result_t run_for_statement(const parse_node_t &header, const parse_node_t &contents);
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parse_execution_result_t run_if_statement(const parse_node_t &statement);
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parse_execution_result_t run_switch_statement(const parse_node_t &statement);
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parse_execution_result_t run_while_statement(const parse_node_t &header, const parse_node_t &contents);
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parse_execution_result_t run_function_statement(const parse_node_t &header, const parse_node_t &contents);
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parse_execution_result_t run_begin_statement(const parse_node_t &header, const parse_node_t &contents);
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wcstring_list_t determine_arguments(const parse_node_t &parent, const parse_node_t **out_unmatched_wildcard_node);
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/* Determines the IO chain. Returns true on success, false on error */
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bool determine_io_chain(const parse_node_t &statement, io_chain_t *out_chain);
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parse_execution_result_t run_1_job(const parse_node_t &job_node, const block_t *associated_block);
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parse_execution_result_t run_job_list(const parse_node_t &job_list_node, const block_t *associated_block);
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parse_execution_result_t populate_job_from_job_node(job_t *j, const parse_node_t &job_node, const block_t *associated_block);
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public:
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parse_execution_context_t(const parse_node_tree_t &t, const wcstring &s, parser_t *p, int initial_eval_level);
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/* Returns the current eval level */
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int current_eval_level() const { return eval_level; }
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/* Returns the current line number. Not const since it touches cached_lineno_offset */
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int get_current_line_number();
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/* Start executing at the given node offset. Returns 0 if there was no error, 1 if there was an error */
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parse_execution_result_t eval_node_at_offset(node_offset_t offset, const block_t *associated_block, const io_chain_t &io);
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};
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#endif
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