mirror of
https://github.com/fish-shell/fish-shell
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273 lines
11 KiB
C++
273 lines
11 KiB
C++
/**\file parse_tree.h
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Programmatic representation of fish code.
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*/
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#ifndef FISH_PARSE_PRODUCTIONS_H
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#define FISH_PARSE_PRODUCTIONS_H
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#include <wchar.h>
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#include "config.h"
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#include "util.h"
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#include "common.h"
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#include "tokenizer.h"
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#include "parse_constants.h"
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#include <vector>
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#include <inttypes.h>
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class parse_node_t;
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class parse_node_tree_t;
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typedef size_t node_offset_t;
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#define NODE_OFFSET_INVALID (static_cast<node_offset_t>(-1))
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struct parse_error_t
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{
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/** Text of the error */
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wcstring text;
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/** Code for the error */
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enum parse_error_code_t code;
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/** Offset and length of the token in the source code that triggered this error */
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size_t source_start;
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size_t source_length;
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/** Return a string describing the error, suitable for presentation to the user. If skip_caret is false, the offending line with a caret is printed as well */
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wcstring describe(const wcstring &src) const;
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/** Return a string describing the error, suitable for presentation to the user, with the given prefix. If skip_caret is false, the offending line with a caret is printed as well */
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wcstring describe_with_prefix(const wcstring &src, const wcstring &prefix, bool skip_caret) const;
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};
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typedef std::vector<parse_error_t> parse_error_list_t;
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/* Returns a description of a list of parse errors */
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wcstring parse_errors_description(const parse_error_list_t &errors, const wcstring &src, const wchar_t *prefix = NULL);
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/** A struct representing the token type that we use internally */
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struct parse_token_t
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{
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enum parse_token_type_t type; // The type of the token as represented by the parser
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enum parse_keyword_t keyword; // Any keyword represented by this token
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bool has_dash_prefix; // Hackish: whether the source contains a dash prefix
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bool is_help_argument; // Hackish: whether the source looks like '-h' or '--help'
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size_t source_start;
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size_t source_length;
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wcstring describe() const;
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wcstring user_presentable_description() const;
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};
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enum
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{
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parse_flag_none = 0,
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/* Attempt to build a "parse tree" no matter what. This may result in a 'forest' of disconnected trees. This is intended to be used by syntax highlighting. */
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parse_flag_continue_after_error = 1 << 0,
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/* Include comment tokens */
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parse_flag_include_comments = 1 << 1,
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/* Indicate that the tokenizer should accept incomplete tokens */
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parse_flag_accept_incomplete_tokens = 1 << 2,
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/* Indicate that the parser should not generate the terminate token, allowing an 'unfinished' tree where some nodes may have no productions. */
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parse_flag_leave_unterminated = 1 << 3
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};
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typedef unsigned int parse_tree_flags_t;
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wcstring parse_dump_tree(const parse_node_tree_t &tree, const wcstring &src);
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wcstring token_type_description(parse_token_type_t type);
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wcstring keyword_description(parse_keyword_t type);
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/** Class for nodes of a parse tree */
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class parse_node_t
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{
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public:
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/* Type of the node */
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enum parse_token_type_t type;
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/* Start in the source code */
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size_t source_start;
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/* Length of our range in the source code */
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size_t source_length;
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/* Parent */
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node_offset_t parent;
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/* Children */
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node_offset_t child_start;
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uint8_t child_count;
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/* Which production was used */
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uint8_t production_idx;
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/* Description */
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wcstring describe(void) const;
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/* Constructor */
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explicit parse_node_t(parse_token_type_t ty) : type(ty), source_start(-1), source_length(0), parent(NODE_OFFSET_INVALID), child_start(0), child_count(0), production_idx(-1)
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{
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}
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node_offset_t child_offset(node_offset_t which) const
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{
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PARSE_ASSERT(which < child_count);
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return child_start + which;
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}
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/* Indicate if this node has a range of source code associated with it */
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bool has_source() const
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{
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return source_start != (size_t)(-1);
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}
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/* Gets source for the node, or the empty string if it has no source */
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wcstring get_source(const wcstring &str) const
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{
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if (! has_source())
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return wcstring();
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else
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return wcstring(str, this->source_start, this->source_length);
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}
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/* Returns whether the given location is within the source range or at its end */
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bool location_in_or_at_end_of_source_range(size_t loc) const
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{
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return has_source() && source_start <= loc && loc - source_start <= source_length;
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}
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};
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/* The parse tree itself */
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class parse_node_tree_t : public std::vector<parse_node_t>
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{
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public:
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/* Get the node corresponding to a child of the given node, or NULL if there is no such child. If expected_type is provided, assert that the node has that type.
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*/
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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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/* Find the first direct child of the given node of the given type. asserts on failure
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*/
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const parse_node_t &find_child(const parse_node_t &parent, parse_token_type_t type) const;
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/* Get the node corresponding to the parent of the given node, or NULL if there is no such child. If expected_type is provided, only returns the parent if it is of that type. Note the asymmetry: get_child asserts since the children are known, but get_parent does not, since the parent may not be known. */
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const parse_node_t *get_parent(const parse_node_t &node, parse_token_type_t expected_type = token_type_invalid) const;
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/* Returns the first ancestor of the given type, or NULL. */
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const parse_node_t *get_first_ancestor_of_type(const parse_node_t &node, parse_token_type_t desired_type) const;
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/* Find all the nodes of a given type underneath a given node, up to max_count of them */
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typedef std::vector<const parse_node_t *> parse_node_list_t;
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parse_node_list_t find_nodes(const parse_node_t &parent, parse_token_type_t type, size_t max_count = (size_t)(-1)) const;
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/* Finds the last node of a given type underneath a given node, or NULL if it could not be found. If parent is NULL, this finds the last node in the tree of that type. */
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const parse_node_t *find_last_node_of_type(parse_token_type_t type, const parse_node_t *parent = NULL) const;
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/* Finds a node containing the given source location. If 'parent' is not NULL, it must be an ancestor. */
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const parse_node_t *find_node_matching_source_location(parse_token_type_t type, size_t source_loc, const parse_node_t *parent) const;
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/* Indicate if the given argument_list or arguments_or_redirections_list is a root list, or has a parent */
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bool argument_list_is_root(const parse_node_t &node) const;
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/* Utilities */
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/* Given a plain statement, get the decoration (from the parent node), or none if there is no decoration */
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enum parse_statement_decoration_t decoration_for_plain_statement(const parse_node_t &node) const;
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/* Given a plain statement, get the command by reference (from the child node). Returns true if successful. Clears the command on failure. */
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bool command_for_plain_statement(const parse_node_t &node, const wcstring &src, wcstring *out_cmd) const;
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/* Given a plain statement, return true if the statement is part of a pipeline. If include_first is set, the first command in a pipeline is considered part of it; otherwise only the second or additional commands are */
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bool statement_is_in_pipeline(const parse_node_t &node, bool include_first) const;
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/* Given a redirection, get the redirection type (or TOK_NONE) and target (file path, or fd) */
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enum token_type type_for_redirection(const parse_node_t &node, const wcstring &src, int *out_fd, wcstring *out_target) const;
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/* If the given node is a block statement, returns the header node (for_header, while_header, begin_header, or function_header). Otherwise returns NULL */
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const parse_node_t *header_node_for_block_statement(const parse_node_t &node) const;
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/* Given a node list (e.g. of type symbol_job_list) and a node type (e.g. symbol_job), return the next element of the given type in that list, and the tail (by reference). Returns NULL if we've exhausted the list. */
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const parse_node_t *next_node_in_node_list(const parse_node_t &node_list, parse_token_type_t item_type, const parse_node_t **list_tail) const;
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/* Given a job, return all of its statements. These are 'specific statements' (e.g. symbol_decorated_statement, not symbol_statement) */
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parse_node_list_t specific_statements_for_job(const parse_node_t &job) const;
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};
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/* The big entry point. Parse a string! */
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bool parse_tree_from_string(const wcstring &str, parse_tree_flags_t flags, parse_node_tree_t *output, parse_error_list_t *errors);
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/* Fish grammar:
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# A job_list is a list of jobs, separated by semicolons or newlines
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job_list = <empty> |
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job job_list
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<TOK_END> job_list
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# A job is a non-empty list of statements, separated by pipes. (Non-empty is useful for cases like if statements, where we require a command). To represent "non-empty", we require a statement, followed by a possibly empty job_continuation
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job = statement job_continuation
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job_continuation = <empty> |
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<TOK_PIPE> statement job_continuation
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# A statement is a normal command, or an if / while / and etc
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statement = boolean_statement | block_statement | if_statement | switch_statement | decorated_statement
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# A block is a conditional, loop, or begin/end
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if_statement = if_clause else_clause end_command arguments_or_redirections_list
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if_clause = <IF> job <TOK_END> job_list
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else_clause = <empty> |
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<ELSE> else_continuation
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else_continuation = if_clause else_clause |
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<TOK_END> job_list
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switch_statement = SWITCH <TOK_STRING> <TOK_END> case_item_list end_command arguments_or_redirections_list
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case_item_list = <empty> |
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case_item case_item_list |
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<TOK_END> case_item_list
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case_item = CASE argument_list <TOK_END> job_list
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block_statement = block_header <TOK_END> job_list end_command arguments_or_redirections_list
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block_header = for_header | while_header | function_header | begin_header
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for_header = FOR var_name IN argument_list
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while_header = WHILE job
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begin_header = BEGIN
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# Functions take arguments, and require at least one (the name). No redirections allowed.
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function_header = FUNCTION argument argument_list
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# A boolean statement is AND or OR or NOT
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boolean_statement = AND statement | OR statement | NOT statement
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# A decorated_statement is a command with a list of arguments_or_redirections, possibly with "builtin" or "command" or "exec"
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decorated_statement = plain_statement | COMMAND plain_statement | BUILTIN plain_statement | EXEC plain_statement
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plain_statement = <TOK_STRING> arguments_or_redirections_list optional_background
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argument_list = <empty> | argument argument_list
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arguments_or_redirections_list = <empty> |
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argument_or_redirection arguments_or_redirections_list
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argument_or_redirection = argument | redirection
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argument = <TOK_STRING>
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redirection = <TOK_REDIRECTION> <TOK_STRING>
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optional_background = <empty> | <TOK_BACKGROUND>
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end_command = END
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*/
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#endif
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