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Document Lua API
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@dcreager
dcreager committed Nov 19, 2023
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272 changes: 272 additions & 0 deletions stack-graphs/src/lua.rs
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//! stack-graphs = { version="0.13", features=["lua"] }
//! mlua = { version="0.9", features=["lua54", "vendored"] }
//! ```
//!
//! ## Lua API
//!
//! ### Stack graphs
//!
//! The following Lua methods are available on a stack graph instance:
//!
//! #### `file`
//!
//! ``` lua
//! local file = graph:file(name)
//! ```
//!
//! Returns the file in the stack graph with the given name, creating it if necessary.
//!
//! #### `jump_to_node`
//!
//! ``` lua
//! local node = graph:jump_to_node()
//! ```
//!
//! Returns the graph's jump-to node.
//!
//! #### `nodes`
//!
//! ``` lua
//! for node in graph:nodes() do
//! -- whatever
//! end
//! ```
//!
//! Returns an iterator of every node in the stack graph.
//!
//! #### `root_node`
//!
//! ``` lua
//! local node = graph:root_node()
//! ```
//!
//! Returns the graph's root node.
//!
//! ### Files
//!
//! The following Lua methods are available on a file instance:
//!
//! #### `definition_node`
//!
//! ``` lua
//! local node = file:definition_node(symbol)
//! ```
//!
//! Adds a new definition node to this file. `symbol` must be a string, or an instance that can be
//! converted to a string via its `tostring` method.
//!
//! #### `drop_scopes_node`
//!
//! ``` lua
//! local node = file:drop_scopes_node()
//! ```
//!
//! Adds a new drop scopes node to this file.
//!
//! #### `exported_scope_node`
//!
//! ``` lua
//! local node = file:exported_scope_node()
//! ```
//!
//! Adds a new exported scope node to this file.
//!
//! #### `internal_scope_node`
//!
//! ``` lua
//! local node = file:internal_scope_node()
//! ```
//!
//! Adds a new internal scope node to this file.
//!
//! #### `pop_scoped_symbol_node`
//!
//! ``` lua
//! local node = file:pop_scoped_symbol_node(symbol)
//! ```
//!
//! Adds a new pop scoped symbol node to this file. `symbol` must be a string, or an instance that
//! can be converted to a string via its `tostring` method.
//!
//! #### `pop_symbol_node`
//!
//! ``` lua
//! local node = file:pop_symbol_node(symbol)
//! ```
//!
//! Adds a new pop symbol node to this file. `symbol` must be a string, or an instance that can be
//! converted to a string via its `tostring` method.
//!
//! #### `push_scoped_symbol_node`
//!
//! ``` lua
//! local node = file:push_scoped_symbol_node(symbol, scope)
//! ```
//!
//! Adds a new push scoped symbol node to this file. `symbol` must be a string, or an instance
//! that can be converted to a string via its `tostring` method. `scope` must be an exported scope
//! node.
//!
//! #### `push_symbol_node`
//!
//! ``` lua
//! local node = file:push_symbol_node(symbol)
//! ```
//!
//! Adds a new push symbol node to this file. `symbol` must be a string, or an instance that can
//! be converted to a string via its `tostring` method.
//!
//! #### `reference_node`
//!
//! ``` lua
//! local node = file:reference_node(symbol)
//! ```
//!
//! Adds a new definition node to this file. `symbol` must be a string, or an instance that can be
//! converted to a string via its `tostring` method.
//!
//! #### `scoped_definition_node`
//!
//! ``` lua
//! local node = file:scoped_definition_node(symbol)
//! ```
//!
//! Adds a new scoped definition node to this file. `symbol` must be a string, or an instance that
//! can be converted to a string via its `tostring` method.
//!
//! #### `scoped_reference_node`
//!
//! ``` lua
//! local node = file:scoped_reference_node(symbol)
//! ```
//!
//! Adds a new scoped reference node to this file. `symbol` must be a string, or an instance that
//! can be converted to a string via its `tostring` method.
//!
//! ### Nodes
//!
//! The following Lua methods are available on a node instance:
//!
//! #### `add_edge_from`
//!
//! ``` lua
//! node:add_edge_from(other, precedence)
//! ```
//!
//! Adds an edge from another node to this node. `precedence` is optional; it defaults to 0 if not
//! given.
//!
//! #### `add_edge_to`
//!
//! ``` lua
//! node:add_edge_to(other, precedence)
//! ```
//!
//! Adds an edge from this node to another node. `precedence` is optional; it defaults to 0 if not
//! given.
//!
//! #### `debug_info`
//!
//! ``` lua
//! let info = node:debug_info()
//! ```
//!
//! Returns a Lua table containing all of the debug info added to this node.
//!
//! #### `definiens_span`
//!
//! ``` lua
//! let span = node:definiens_span()
//! ```
//!
//! Returns the definiens span of this node. (See [`set_definiens_span`](#set_definiens_span) for
//! the structure of a span.)
//!
//! #### `local_id`
//!
//! ``` lua
//! let local_id = node:local_id()
//! ```
//!
//! Returns the local ID of this node within its file.
//!
//! #### `set_debug_info`
//!
//! ``` lua
//! node:add_debug_info(key, value)
//! ```
//!
//! Adds a new debug info to this node. `key` and `value` must each be a string, or an instance
//! that can be converted to a string via its `tostring` method.
//!
//! #### `set_definiens_span`
//!
//! ``` lua
//! node:set_definiens_span {
//! start = {
//! line = 1,
//! column = { utf8_offset = 1, utf16_offset = 1, grapheme_offset = 1 },
//! -- UTF-8 offsets within the source file of the line containing the span
//! containing_line = { start = 1, end = 14 },
//! -- UTF-8 offsets within the source file of the line containing the span, with leading and
//! -- trailing whitespace removed
//! trimmed_line = { start = 2, end = 12 },
//! },
//! end = {
//! line = 2,
//! column = { utf8_offset = 12, utf16_offset = 10, grapheme_offset = 8 },
//! containing_line = { start = 1, end = 14 },
//! trimmed_line = { start = 1, end = 14 },
//! },
//! }
//! ```
//!
//! Sets the definiens span of this node. All entries in the table are optional, and default to 0
//! if not provided.
//!
//! #### `set_span`
//!
//! ``` lua
//! node:set_span {
//! start = {
//! line = 1,
//! column = { utf8_offset = 1, utf16_offset = 1, grapheme_offset = 1 },
//! -- UTF-8 offsets within the source file of the line containing the span
//! containing_line = { start = 1, end = 14 },
//! -- UTF-8 offsets within the source file of the line containing the span, with leading and
//! -- trailing whitespace removed
//! trimmed_line = { start = 2, end = 12 },
//! },
//! end = {
//! line = 2,
//! column = { utf8_offset = 12, utf16_offset = 10, grapheme_offset = 8 },
//! containing_line = { start = 1, end = 14 },
//! trimmed_line = { start = 1, end = 14 },
//! },
//! }
//! ```
//!
//! Sets the span of this node. All entries in the table are optional, and default to 0 if not
//! provided.
//!
//! #### `set_syntax_type`
//!
//! ``` lua
//! node:set_syntax_type(syntax_type)
//! ```
//!
//! Sets the syntax type of this node. `syntax_type` must be a string, or an instance that can be
//! converted to a string via its `tostring` method.
//!
//! #### `span`
//!
//! ``` lua
//! let span = node:span()
//! ```
//!
//! Returns the span of this node. (See [`set_span`](#set_span) for the structure of a span.)
//!
//! #### `syntax_type`
//!
//! ``` lua
//! let syntax_type = node:syntax_type()
//! ```
//!
//! Returns the syntax type of this node.

// Implementation notes: Stack graphs, files, and nodes can live inside the Lua interpreter as
// objects. They are each wrapped in a userdata, with a metatable defining the methods that are
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