fish-shell/src/parse_tree.h

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// Programmatic representation of fish code.
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#ifndef FISH_PARSE_PRODUCTIONS_H
#define FISH_PARSE_PRODUCTIONS_H
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#include <stddef.h>
#include <stdint.h>
#include <sys/types.h>
#include <memory>
#include <vector>
#include "common.h"
#include "maybe.h"
#include "parse_constants.h"
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#include "parse_grammar.h"
#include "tokenizer.h"
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class parse_node_tree_t;
typedef uint32_t node_offset_t;
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#define NODE_OFFSET_INVALID (static_cast<node_offset_t>(-1))
typedef uint32_t source_offset_t;
constexpr source_offset_t SOURCE_OFFSET_INVALID = static_cast<source_offset_t>(-1);
/// A struct representing the token type that we use internally.
struct parse_token_t {
enum parse_token_type_t type; // The type of the token as represented by the parser
enum parse_keyword_t keyword; // Any keyword represented by this token
bool has_dash_prefix; // Hackish: whether the source contains a dash prefix
bool is_help_argument; // Hackish: whether the source looks like '-h' or '--help'
bool is_newline; // Hackish: if TOK_END, whether the source is a newline.
source_offset_t source_start;
source_offset_t source_length;
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wcstring describe() const;
wcstring user_presentable_description() const;
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};
enum {
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parse_flag_none = 0,
/// 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,
/// Include comment tokens.
parse_flag_include_comments = 1 << 1,
/// Indicate that the tokenizer should accept incomplete tokens */
parse_flag_accept_incomplete_tokens = 1 << 2,
/// Indicate that the parser should not generate the terminate token, allowing an 'unfinished'
/// tree where some nodes may have no productions.
parse_flag_leave_unterminated = 1 << 3,
/// Indicate that the parser should generate job_list entries for blank lines.
parse_flag_show_blank_lines = 1 << 4
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};
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typedef unsigned int parse_tree_flags_t;
wcstring parse_dump_tree(const parse_node_tree_t &tree, const wcstring &src);
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const wchar_t *token_type_description(parse_token_type_t type);
const wchar_t *keyword_description(parse_keyword_t type);
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// Node flags.
enum {
/// Flag indicating that the node has associated comment nodes.
parse_node_flag_has_comments = 1 << 0,
};
typedef uint8_t parse_node_flags_t;
/// Node-type specific tag value.
typedef uint8_t parse_node_tag_t;
/// Class for nodes of a parse tree. Since there's a lot of these, the size and order of the fields
/// is important.
class parse_node_t {
public:
// Start in the source code.
source_offset_t source_start;
// Length of our range in the source code.
source_offset_t source_length;
// Parent
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node_offset_t parent;
// Children
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node_offset_t child_start;
// Number of children.
uint8_t child_count;
// Type of the node.
enum parse_token_type_t type;
// Keyword associated with node.
enum parse_keyword_t keyword;
// Node flags.
parse_node_flags_t flags : 4;
// This is used to store e.g. the statement decoration.
parse_node_tag_t tag : 4;
// Description
wcstring describe() const;
// Constructor
explicit parse_node_t(parse_token_type_t ty)
: source_start(SOURCE_OFFSET_INVALID),
source_length(0),
parent(NODE_OFFSET_INVALID),
child_start(0),
child_count(0),
type(ty),
keyword(parse_keyword_none),
flags(0),
tag(0) {}
node_offset_t child_offset(node_offset_t which) const {
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PARSE_ASSERT(which < child_count);
return child_start + which;
}
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/// Indicate if this node has a range of source code associated with it.
bool has_source() const {
// Should never have a nonempty range with an invalid offset.
assert(this->source_start != SOURCE_OFFSET_INVALID || this->source_length == 0);
return this->source_length > 0;
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}
/// Indicate if the node has comment nodes.
bool has_comments() const {
return static_cast<bool>(this->flags & parse_node_flag_has_comments);
}
/// Gets source for the node, or the empty string if it has no source.
wcstring get_source(const wcstring &str) const {
if (!has_source())
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return wcstring();
else
return wcstring(str, this->source_start, this->source_length);
}
/// Returns whether the given location is within the source range or at its end.
bool location_in_or_at_end_of_source_range(size_t loc) const {
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return has_source() && source_start <= loc && loc - source_start <= source_length;
}
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};
template <typename Type>
class tnode_t;
/// The parse tree itself.
class parse_node_tree_t : public std::vector<parse_node_t> {
public:
parse_node_tree_t() {}
parse_node_tree_t(parse_node_tree_t &&) = default;
parse_node_tree_t &operator=(parse_node_tree_t &&) = default;
parse_node_tree_t(const parse_node_tree_t &) = delete; // no copying
parse_node_tree_t &operator=(const parse_node_tree_t &) = delete; // no copying
// 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.
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;
// Find the first direct child of the given node of the given type. asserts on failure.
const parse_node_t &find_child(const parse_node_t &parent, parse_token_type_t type) const;
template <typename Type>
tnode_t<Type> find_child(const parse_node_t &parent) const;
// 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.
const parse_node_t *get_parent(const parse_node_t &node,
parse_token_type_t expected_type = token_type_invalid) const;
// Finds the last node of a given type, or empty if it could not be found. If parent is NULL,
// this finds the last node in the tree of that type.
template <typename Type>
tnode_t<Type> find_last_node(const parse_node_t *parent = NULL) const;
// Finds a node containing the given source location. If 'parent' is not NULL, it must be an
// ancestor.
const parse_node_t *find_node_matching_source_location(parse_token_type_t type,
size_t source_loc,
const parse_node_t *parent) const;
// Utilities
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/// Given a node, return all of its comment nodes.
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std::vector<tnode_t<grammar::comment>> comment_nodes_for_node(const parse_node_t &node) const;
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private:
template <typename Type>
friend class tnode_t;
/// 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.
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;
// 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.
const parse_node_t *find_last_node_of_type(parse_token_type_t type,
const parse_node_t *parent) const;
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};
/// The big entry point. Parse a string, attempting to produce a tree for the given goal type.
bool parse_tree_from_string(const wcstring &str, parse_tree_flags_t flags,
parse_node_tree_t *output, parse_error_list_t *errors,
parse_token_type_t goal = symbol_job_list);
/// A type wrapping up a parse tree and the original source behind it.
struct parsed_source_t {
wcstring src;
parse_node_tree_t tree;
parsed_source_t(wcstring s, parse_node_tree_t t) : src(std::move(s)), tree(std::move(t)) {}
parsed_source_t(const parsed_source_t &) = delete;
void operator=(const parsed_source_t &) = delete;
parsed_source_t(parsed_source_t &&) = default;
parsed_source_t &operator=(parsed_source_t &&) = default;
};
/// Return a shared pointer to parsed_source_t, or null on failure.
using parsed_source_ref_t = std::shared_ptr<const parsed_source_t>;
parsed_source_ref_t parse_source(wcstring src, parse_tree_flags_t flags, parse_error_list_t *errors,
parse_token_type_t goal = symbol_job_list);
#endif