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265 lines (225 loc) · 7.32 KB
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------------
-- Language-dependent parsing of code.
-- This encapsulates the different strategies needed for parsing C and Lua
-- source code.
local class = require 'pl.class'
local utils = require 'pl.utils'
local tools = require 'ldoc.tools'
local lexer = require 'ldoc.lexer'
local quit = utils.quit
local tnext = lexer.skipws
local Lang = class()
function Lang:trim_comment (s)
return s:gsub(self.line_comment,'')
end
function Lang:start_comment (v)
local line = v:match (self.start_comment_)
if line and self.end_comment_ and v:match (self.end_comment_) then
return nil
end
local block = v:match(self.block_comment)
return line or block, block
end
function Lang:empty_comment (v)
return v:match(self.empty_comment_)
end
function Lang:grab_block_comment(v,tok)
v = v:gsub(self.block_comment,'')
return tools.grab_block_comment(v,tok,self.end_comment)
end
function Lang:find_module(tok,t,v)
return '...',t,v
end
function Lang:item_follows(t,v)
return false
end
function Lang:finalize()
self.empty_comment_ = self.start_comment_..'%s*$'
end
function Lang:search_for_token (tok,type,value,t,v)
while t and not (t == type and v == value) do
if t == 'comment' and self:start_comment(v) then return nil,t,v end
t,v = tnext(tok)
end
return t ~= nil,t,v
end
function Lang:parse_extra (tags,tok)
end
function Lang:is_module_modifier ()
return false
end
function Lang:parse_module_modifier (tags, tok)
return nil, "@usage or @exports deduction not implemented for this language"
end
local Lua = class(Lang)
function Lua:_init()
self.line_comment = '^%-%-+' -- used for stripping
self.start_comment_ = '^%-%-%-+' -- used for doc comment line start
self.block_comment = '^%-%-%[=*%[%-+' -- used for block doc comments
self.end_comment_ = '[^%-]%-%-+\n$' ---- exclude --- this kind of comment ---
self:finalize()
end
function Lua.lexer(fname)
local f,e = io.open(fname)
if not f then quit(e) end
return lexer.lua(f,{}),f
end
function Lua:grab_block_comment(v,tok)
local equals = v:match('^%-%-%[(=*)%[')
v = v:gsub(self.block_comment,'')
return tools.grab_block_comment(v,tok,'%]'..equals..'%]')
end
function Lua:parse_module_call(tok,t,v)
t,v = tnext(tok)
if t == '(' then t,v = tnext(tok) end
if t == 'string' then -- explicit name, cool
return v,t,v
elseif t == '...' then -- we have to guess!
return '...',t,v
end
end
-- If a module name was not provided, then we look for an explicit module()
-- call. However, we should not try too hard; if we hit a doc comment then
-- we should go back and process it. Likewise, module(...) also means
-- that we must infer the module name.
function Lua:find_module(tok,t,v)
local res
res,t,v = self:search_for_token(tok,'iden','module',t,v)
if not res then return nil,t,v end
return self:parse_module_call(tok,t,v)
end
local function parse_lua_parameters (tags,tok)
tags.formal_args = tools.get_parameters(tok)
tags:add('class','function')
end
local function parse_lua_function_header (tags,tok)
if not tags.name then
tags:add('name',tools.get_fun_name(tok))
end
if not tags.name then return 'function has no name' end
parse_lua_parameters(tags,tok)
end
local function parse_lua_table (tags,tok)
tags.formal_args = tools.get_parameters(tok,'}',function(s)
return s == ',' or s == ';'
end)
end
--------------- function and variable inferrence -----------
-- After a doc comment, there may be a local followed by:
-- [1] (l)function: function NAME
-- [2] (l)function: NAME = function
-- [3] table: NAME = {
-- [4] field: NAME = <anything else> (this is a module-level field)
--
-- Depending on the case successfully detected, returns a function which
-- will be called later to fill in inferred item tags
function Lua:item_follows(t,v,tok)
local parser, case
local is_local = t == 'keyword' and v == 'local'
if is_local then t,v = tnext(tok) end
if t == 'keyword' and v == 'function' then -- case [1]
case = 1
parser = parse_lua_function_header
elseif t == 'iden' then
local name,t,v = tools.get_fun_name(tok,v)
if t ~= '=' then return nil end -- probably invalid code...
t,v = tnext(tok)
if t == 'keyword' and v == 'function' then -- case [2]
tnext(tok) -- skip '('
case = 2
parser = function(tags,tok)
tags:add('name',name)
parse_lua_parameters(tags,tok)
end
elseif t == '{' then -- case [3]
case = 3
parser = function(tags,tok)
tags:add('class','table')
tags:add('name',name)
parse_lua_table (tags,tok)
end
else -- case [4]
case = 4
parser = function(tags)
tags:add('class','field')
tags:add('name',name)
end
end
elseif t == 'keyword' and v == 'return' then
t, v = tnext(tok)
if t == 'keyword' and v == 'function' then
-- return function(a, b, c)
tnext(tok) -- skip '('
case = 2
parser = parse_lua_parameters
elseif t == '{' then
-- return {...}
case = 5
parser = function(tags,tok)
tags:add('class','table')
parse_lua_table(tags,tok)
end
else
return nil
end
end
return parser, is_local, case
end
-- we only call the function returned by the item_follows above if there
-- is not already a name and a type.
-- Otherwise, this is called. Currrently only tries to fill in the fields
-- of a table from a table definition as identified above
function Lua:parse_extra (tags,tok,case)
if tags.class == 'table' and not tags.field and case == 3 then
parse_lua_table(tags,tok)
end
end
-- For Lua, a --- @usage comment means that a long
-- string containing the usage follows, which we
-- use to update the module usage tag. Likewise, the @export
-- tag alone in a doc comment refers to the following returned
-- Lua table of functions
function Lua:is_module_modifier (tags)
return tags.summary == '' and (tags.usage or tags.export)
end
-- Allow for private name convention.
function Lua:is_private_var (name)
return name:match '^_' or name:match '_$'
end
function Lua:parse_module_modifier (tags, tok, F)
if tags.usage then
if tags.class ~= 'field' then return nil,"cannot deduce @usage" end
local t1= tnext(tok)
if t1 ~= '[' then return nil, t1..' '..': not a long string' end
local t, v = tools.grab_block_comment('',tok,'%]%]')
return true, v, 'usage'
elseif tags.export then
if tags.class ~= 'table' then return nil, "cannot deduce @export" end
for f in tags.formal_args:iter() do
if not self:is_private_var(f) then
F:export_item(f)
end
end
return true
end
end
-- note a difference here: we scan C/C++ code in full-text mode, not line by line.
-- This is because we can't detect multiline comments in line mode
local CC = class(Lang)
function CC:_init()
self.line_comment = '^//+'
self.start_comment_ = '^///+'
self.block_comment = '^/%*%*+'
self:finalize()
end
function CC.lexer(f)
local err
f,err = utils.readfile(f)
if not f then quit(err) end
return lexer.cpp(f,{})
end
function CC:grab_block_comment(v,tok)
v = v:gsub(self.block_comment,'')
return 'comment',v:sub(1,-3)
end
return { lua = Lua(), cc = CC() }