neovim/scripts/luacats_parser.lua

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local luacats_grammar = require('scripts.luacats_grammar')
--- @class nvim.luacats.parser.param
--- @field name string
--- @field type string
--- @field desc string
--- @class nvim.luacats.parser.return
--- @field name string
--- @field type string
--- @field desc string
--- @class nvim.luacats.parser.note
--- @field desc string
--- @class nvim.luacats.parser.brief
--- @field kind 'brief'
--- @field desc string
--- @class nvim.luacats.parser.alias
--- @field kind 'alias'
--- @field type string
--- @field desc string
--- @class nvim.luacats.parser.fun
--- @field name string
--- @field params nvim.luacats.parser.param[]
--- @field returns nvim.luacats.parser.return[]
--- @field desc string
--- @field access? 'private'|'package'|'protected'
--- @field class? string
--- @field module? string
--- @field modvar? string
--- @field classvar? string
--- @field deprecated? true
--- @field since? string
--- @field attrs? string[]
--- @field nodoc? true
--- @field generics? table<string,string>
--- @field table? true
--- @field notes? nvim.luacats.parser.note[]
--- @field see? nvim.luacats.parser.note[]
--- @class nvim.luacats.parser.field
--- @field name string
--- @field type string
--- @field desc string
--- @field access? 'private'|'package'|'protected'
--- @class nvim.luacats.parser.class
--- @field kind 'class'
--- @field name string
--- @field desc string
--- @field fields nvim.luacats.parser.field[]
--- @field notes? string[]
--- @class nvim.luacats.parser.State
--- @field doc_lines? string[]
--- @field cur_obj? nvim.luacats.parser.obj
--- @field last_doc_item? nvim.luacats.parser.param|nvim.luacats.parser.return|nvim.luacats.parser.note
--- @field last_doc_item_indent? integer
--- @alias nvim.luacats.parser.obj
--- | nvim.luacats.parser.class
--- | nvim.luacats.parser.fun
--- | nvim.luacats.parser.brief
-- Remove this when we document classes properly
--- Some doc lines have the form:
--- param name some.complex.type (table) description
--- if so then transform the line to remove the complex type:
--- param name (table) description
--- @param line string
local function use_type_alt(line)
for _, type in ipairs({ 'table', 'function' }) do
line = line:gsub('@param%s+([a-zA-Z_?]+)%s+.*%((' .. type .. ')%)', '@param %1 %2')
line = line:gsub('@param%s+([a-zA-Z_?]+)%s+.*%((' .. type .. '|nil)%)', '@param %1 %2')
line = line:gsub('@param%s+([a-zA-Z_?]+)%s+.*%((' .. type .. '%?)%)', '@param %1 %2')
line = line:gsub('@return%s+.*%((' .. type .. ')%)', '@return %1')
line = line:gsub('@return%s+.*%((' .. type .. '|nil)%)', '@return %1')
line = line:gsub('@return%s+.*%((' .. type .. '%?)%)', '@return %1')
end
return line
end
--- If we collected any `---` lines. Add them to the existing (or new) object
--- Used for function/class descriptions and multiline param descriptions.
--- @param state nvim.luacats.parser.State
local function add_doc_lines_to_obj(state)
if state.doc_lines then
state.cur_obj = state.cur_obj or {}
local cur_obj = assert(state.cur_obj)
local txt = table.concat(state.doc_lines, '\n')
if cur_obj.desc then
cur_obj.desc = cur_obj.desc .. '\n' .. txt
else
cur_obj.desc = txt
end
state.doc_lines = nil
end
end
--- @param line string
--- @param state nvim.luacats.parser.State
local function process_doc_line(line, state)
line = line:sub(4):gsub('^%s+@', '@')
line = use_type_alt(line)
local parsed = luacats_grammar:match(line)
if not parsed then
if line:match('^ ') then
line = line:sub(2)
end
if state.last_doc_item then
if not state.last_doc_item_indent then
state.last_doc_item_indent = #line:match('^%s*') + 1
end
state.last_doc_item.desc = (state.last_doc_item.desc or '')
.. '\n'
.. line:sub(state.last_doc_item_indent or 1)
else
state.doc_lines = state.doc_lines or {}
table.insert(state.doc_lines, line)
end
return
end
state.last_doc_item_indent = nil
state.last_doc_item = nil
state.cur_obj = state.cur_obj or {}
local cur_obj = assert(state.cur_obj)
local kind = parsed.kind
if kind == 'brief' then
state.cur_obj = {
kind = 'brief',
desc = parsed.desc,
}
elseif kind == 'class' then
--- @cast parsed nvim.luacats.Class
state.cur_obj = {
kind = 'class',
name = parsed.name,
parent = parsed.parent,
desc = '',
fields = {},
}
elseif kind == 'field' then
--- @cast parsed nvim.luacats.Field
if not parsed.access then
parsed.desc = parsed.desc or state.doc_lines and table.concat(state.doc_lines, '\n') or nil
if parsed.desc then
parsed.desc = vim.trim(parsed.desc)
end
table.insert(cur_obj.fields, parsed)
end
state.doc_lines = nil
elseif kind == 'param' then
state.last_doc_item_indent = nil
cur_obj.params = cur_obj.params or {}
if vim.endswith(parsed.name, '?') then
parsed.name = parsed.name:sub(1, -2)
parsed.type = parsed.type .. '?'
end
state.last_doc_item = {
name = parsed.name,
type = parsed.type,
desc = parsed.desc,
}
table.insert(cur_obj.params, state.last_doc_item)
elseif kind == 'return' then
cur_obj.returns = cur_obj.returns or {}
for _, t in ipairs(parsed) do
table.insert(cur_obj.returns, {
name = t.name,
type = t.type,
desc = parsed.desc,
})
end
state.last_doc_item_indent = nil
state.last_doc_item = cur_obj.returns[#cur_obj.returns]
elseif kind == 'private' then
cur_obj.access = 'private'
elseif kind == 'package' then
cur_obj.access = 'package'
elseif kind == 'protected' then
cur_obj.access = 'protected'
elseif kind == 'deprecated' then
cur_obj.deprecated = true
elseif kind == 'nodoc' then
cur_obj.nodoc = true
elseif kind == 'since' then
cur_obj.since = parsed.desc
elseif kind == 'see' then
cur_obj.see = cur_obj.see or {}
table.insert(cur_obj.see, { desc = parsed.desc })
elseif kind == 'note' then
state.last_doc_item_indent = nil
state.last_doc_item = {
desc = parsed.desc,
}
cur_obj.notes = cur_obj.notes or {}
table.insert(cur_obj.notes, state.last_doc_item)
elseif kind == 'type' then
cur_obj.desc = parsed.desc
parsed.desc = nil
parsed.kind = nil
cur_obj.type = parsed
elseif kind == 'alias' then
state.cur_obj = {
kind = 'alias',
desc = parsed.desc,
}
elseif kind == 'enum' then
-- TODO
state.doc_lines = nil
elseif
vim.tbl_contains({
'diagnostic',
'cast',
'overload',
'meta',
}, kind)
then
-- Ignore
return
elseif kind == 'generic' then
cur_obj.generics = cur_obj.generics or {}
cur_obj.generics[parsed.name] = parsed.type or 'any'
else
error('Unhandled' .. vim.inspect(parsed))
end
end
--- @param fun nvim.luacats.parser.fun
--- @return nvim.luacats.parser.field
local function fun2field(fun)
local parts = { 'fun(' }
for _, p in ipairs(fun.params or {}) do
parts[#parts + 1] = string.format('%s: %s', p.name, p.type)
end
parts[#parts + 1] = ')'
if fun.returns then
parts[#parts + 1] = ': '
local tys = {} --- @type string[]
for _, p in ipairs(fun.returns) do
tys[#tys + 1] = p.type
end
parts[#parts + 1] = table.concat(tys, ', ')
end
return {
name = fun.name,
type = table.concat(parts, ''),
access = fun.access,
desc = fun.desc,
}
end
--- Function to normalize known form for declaring functions and normalize into a more standard
--- form.
--- @param line string
--- @return string
local function filter_decl(line)
-- M.fun = vim._memoize(function(...)
-- ->
-- function M.fun(...)
line = line:gsub('^local (.+) = .*_memoize%([^,]+, function%((.*)%)$', 'local function %1(%2)')
line = line:gsub('^(.+) = .*_memoize%([^,]+, function%((.*)%)$', 'function %1(%2)')
return line
end
--- @param line string
--- @param state nvim.luacats.parser.State
--- @param classes table<string,nvim.luacats.parser.class>
--- @param classvars table<string,string>
--- @param has_indent boolean
local function process_lua_line(line, state, classes, classvars, has_indent)
line = filter_decl(line)
if state.cur_obj and state.cur_obj.kind == 'class' then
local nm = line:match('^local%s+([a-zA-Z0-9_]+)%s*=')
if nm then
classvars[nm] = state.cur_obj.name
end
return
end
do
local parent_tbl, sep, fun_or_meth_nm =
line:match('^function%s+([a-zA-Z0-9_]+)([.:])([a-zA-Z0-9_]+)%s*%(')
if parent_tbl then
-- Have a decl. Ensure cur_obj
state.cur_obj = state.cur_obj or {}
local cur_obj = assert(state.cur_obj)
-- Match `Class:foo` methods for defined classes
local class = classvars[parent_tbl]
if class then
--- @cast cur_obj nvim.luacats.parser.fun
cur_obj.name = fun_or_meth_nm
cur_obj.class = class
cur_obj.classvar = parent_tbl
-- Add self param to methods
if sep == ':' then
cur_obj.params = cur_obj.params or {}
table.insert(cur_obj.params, 1, {
name = 'self',
type = class,
})
end
-- Add method as the field to the class
table.insert(classes[class].fields, fun2field(cur_obj))
return
end
-- Match `M.foo`
if cur_obj and parent_tbl == cur_obj.modvar then
cur_obj.name = fun_or_meth_nm
return
end
end
end
do
-- Handle: `function A.B.C.foo(...)`
local fn_nm = line:match('^function%s+([.a-zA-Z0-9_]+)%s*%(')
if fn_nm then
state.cur_obj = state.cur_obj or {}
state.cur_obj.name = fn_nm
return
end
end
do
-- Handle: `M.foo = {...}` where `M` is the modvar
local parent_tbl, tbl_nm = line:match('([a-zA-Z_]+)%.([a-zA-Z0-9_]+)%s*=')
if state.cur_obj and parent_tbl and parent_tbl == state.cur_obj.modvar then
state.cur_obj.name = tbl_nm
state.cur_obj.table = true
return
end
end
do
-- Handle: `foo = {...}`
local tbl_nm = line:match('^([a-zA-Z0-9_]+)%s*=')
if tbl_nm and not has_indent then
state.cur_obj = state.cur_obj or {}
state.cur_obj.name = tbl_nm
state.cur_obj.table = true
return
end
end
do
-- Handle: `vim.foo = {...}`
local tbl_nm = line:match('^(vim%.[a-zA-Z0-9_]+)%s*=')
if state.cur_obj and tbl_nm and not has_indent then
state.cur_obj.name = tbl_nm
state.cur_obj.table = true
return
end
end
if state.cur_obj then
if line:find('^%s*%-%- luacheck:') then
state.cur_obj = nil
elseif line:find('^%s*local%s+') then
state.cur_obj = nil
elseif line:find('^%s*return%s+') then
state.cur_obj = nil
elseif line:find('^%s*[a-zA-Z_.]+%(%s+') then
state.cur_obj = nil
end
end
end
--- Determine the table name used to export functions of a module
--- Usually this is `M`.
--- @param filename string
--- @return string?
local function determine_modvar(filename)
local modvar --- @type string?
for line in io.lines(filename) do
do
--- @type string?
local m = line:match('^return%s+([a-zA-Z_]+)')
if m then
modvar = m
end
end
do
--- @type string?
local m = line:match('^return%s+setmetatable%(([a-zA-Z_]+),')
if m then
modvar = m
end
end
end
return modvar
end
--- @param obj nvim.luacats.parser.obj
--- @param funs nvim.luacats.parser.fun[]
--- @param classes table<string,nvim.luacats.parser.class>
--- @param briefs string[]
--- @param uncommitted nvim.luacats.parser.obj[]
local function commit_obj(obj, classes, funs, briefs, uncommitted)
local commit = false
if obj.kind == 'class' then
--- @cast obj nvim.luacats.parser.class
if not classes[obj.name] then
classes[obj.name] = obj
commit = true
end
elseif obj.kind == 'alias' then
-- Just pretend
commit = true
elseif obj.kind == 'brief' then
--- @cast obj nvim.luacats.parser.brief`
briefs[#briefs + 1] = obj.desc
commit = true
else
--- @cast obj nvim.luacats.parser.fun`
if obj.name then
funs[#funs + 1] = obj
commit = true
end
end
if not commit then
table.insert(uncommitted, obj)
end
return commit
end
--- @param filename string
--- @param uncommitted nvim.luacats.parser.obj[]
-- luacheck: no unused
local function dump_uncommitted(filename, uncommitted)
local out_path = 'luacats-uncommited/' .. filename:gsub('/', '%%') .. '.txt'
if #uncommitted > 0 then
print(string.format('Could not commit %d objects in %s', #uncommitted, filename))
vim.fn.mkdir(assert(vim.fs.dirname(out_path)), 'p')
local f = assert(io.open(out_path, 'w'))
for i, x in ipairs(uncommitted) do
f:write(i)
f:write(': ')
f:write(vim.inspect(x))
f:write('\n')
end
f:close()
else
vim.fn.delete(out_path)
end
end
local M = {}
--- @param filename string
--- @return table<string,nvim.luacats.parser.class> classes
--- @return nvim.luacats.parser.fun[] funs
--- @return string[] briefs
--- @return nvim.luacats.parser.obj[]
function M.parse(filename)
local funs = {} --- @type nvim.luacats.parser.fun[]
local classes = {} --- @type table<string,nvim.luacats.parser.class>
local briefs = {} --- @type string[]
local mod_return = determine_modvar(filename)
--- @type string
local module = filename:match('.*/lua/([a-z_][a-z0-9_/]+)%.lua') or filename
module = module:gsub('/', '.')
local classvars = {} --- @type table<string,string>
local state = {} --- @type nvim.luacats.parser.State
-- Keep track of any partial objects we don't commit
local uncommitted = {} --- @type nvim.luacats.parser.obj[]
for line in io.lines(filename) do
local has_indent = line:match('^%s+') ~= nil
line = vim.trim(line)
if vim.startswith(line, '---') then
process_doc_line(line, state)
else
add_doc_lines_to_obj(state)
if state.cur_obj then
state.cur_obj.modvar = mod_return
state.cur_obj.module = module
end
process_lua_line(line, state, classes, classvars, has_indent)
-- Commit the object
local cur_obj = state.cur_obj
if cur_obj then
if not commit_obj(cur_obj, classes, funs, briefs, uncommitted) then
--- @diagnostic disable-next-line:inject-field
cur_obj.line = line
end
end
state = {}
end
end
-- dump_uncommitted(filename, uncommitted)
return classes, funs, briefs, uncommitted
end
return M