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local lpeg = require 'lpeg'
local test = require 'test'
local io = require 'io'
local format = string.format
local pack = table.pack
local concat = table.concat
local readme_parser
do
local P = lpeg.P
local S = lpeg.S
local V = lpeg.V
local C = lpeg.C
local Cc = lpeg.Cc
local Ct = lpeg.Ct
local sp = P(' ')
local eq = P('=')
local nl = P('\n')
local non_nl = P(1)-nl
local rest_of_line = non_nl^0
local extraline = (nl * sp * sp)^-1
local line_or_space = extraline + sp^1
local div = line_or_space * P('-- returns') * line_or_space
local assign_mid = sp^1 * eq * sp^1
local table = P{"{" * ((1 - S('{}')) + V(1))^0 * "}"}
local not_str = (sp^0 * nl) + div + assign_mid + P('{')
local plainstr = (P(1)-not_str)^1
local str = C(plainstr * (table * plainstr^0)^0)
local example = Ct(Cc('example') * str * div * str)
local assign_left = P('local ')^-1 * str
local assign_right = str
local assignment = Ct(Cc('assignment') * assign_left * assign_mid * assign_right)
local comment = P('--') * rest_of_line
local indented_line = sp^2 * (comment + example + assignment) * sp^0
local anyline = rest_of_line - (sp * rest_of_line)
local non_match = Ct(Cc('unable to parse line') * C(rest_of_line))
local line = indented_line + anyline + non_match
readme_parser = Ct((line * nl)^0 * line^-1 * -1)
end
local env = {
tostring = tostring,
require = require,
}
local function run_error(code, err)
print()
print('code:', code)
print('error:', err)
print()
return { true, nil, n=3 }
end
local function run(name, code)
local f, err = load(code, name, 't', env)
if not f then
return run_error(code, err)
end
local ret = pack(pcall(f))
if ret[1] then
return ret
else
return run_error(code, ret[2])
end
end
local function run_example(name, code)
return run(name, format('return %s', code))
end
local function get_meta_function(t, fname)
return rawget(getmetatable(t) or {}, fname)
end
local function table2str(t)
local nt = {}
for i=1,#t do
nt[i] = tostring(t[i])
end
return '{ ' .. concat(nt, ', ') .. ' }'
end
local function pack2str(t)
local new = {}
local n = t.n
for i=2,n do
local v = t[i]
local vt = type(v)
if vt == 'nil' then
new[i] = 'nil'
elseif vt == 'table' then
local tostr = get_meta_function(v, '__tostring') or table2str
new[i] = tostr(v)
else
new[i] = format('%s "%s"', vt, v)
end
end
return concat(new, ', ', 2, n)
end
local function compare_tables(a, b)
local aeq = get_meta_function(a, '__eq')
local beq = get_meta_function(b, '__eq')
if aeq or beq then
if aeq ~= beq then return false end
if a ~= b then return false end
end
local a_key_cnt = 0
for _,_ in pairs(a) do
a_key_cnt = a_key_cnt + 1
end
for k,vb in pairs(b) do
a_key_cnt = a_key_cnt - 1
local va = a[k]
if va == nil then return false end
local vat = type(va)
local vbt = type(vb)
if vat ~= vbt then return false end
if vat == 'table' then
if not compare_tables(va, vb) then return false end
else
if va ~= vb then return false end
end
end
if a_key_cnt ~= 0 then
return false
end
return true
end
local function hdl_assignment(line)
local code = format('%s = %s', line[2], line[3])
run('assignment', code)
end
local function hdl_example(line)
local t1 = line[2]
local t2 = line[3]
local r1 = run_example('left side', t1)
local r2 = run_example('right side', t2)
local errmsg = format('"%s" returns %s, not %s', t1, pack2str(r1), pack2str(r2))
assert(compare_tables(r1, r2), errmsg)
end
local handlers = {
assignment = hdl_assignment,
example = hdl_example,
}
local function readme_test()
local data = assert(io.open('README.rst', 'r')):read('*a')
local lines = assert(readme_parser:match(data))
for i=1,#lines do
local line = lines[i]
local kind = line[1]
local handler = handlers[kind]
if not handler then
print('unknown handler', kind, line[2])
end
handler(line)
end
end
return test.new(readme_test)
|
