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feat: added lpeg parser for parsing
:Trouble
args into lua tables
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---@diagnostic disable: no-unknown | ||
local lpeg = vim.lpeg | ||
local P, S, R = lpeg.P, lpeg.S, lpeg.R | ||
local C, Ct, Cs = lpeg.C, lpeg.Ct, lpeg.Cs | ||
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local M = {} | ||
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---@type vim.lpeg.Pattern|Capture | ||
local pattern | ||
do | ||
-- Basic Definitions | ||
local ws = S(" \t") ^ 0 -- Optional whitespace | ||
local eq = P("=") -- Equals sign | ||
local key_component = R("az", "AZ", "09", "__") ^ 1 -- Single component of a key | ||
local dot = P(".") -- Dot separator | ||
local full_key = C(key_component * (dot * key_component) ^ 0) -- Full dot-separated key | ||
---@type vim.lpeg.Pattern|Capture | ||
local value = (P('"') * (P("\\") * P(1) + (1 - P('"'))) ^ 0 * P('"')) -- Values that are quoted strings | ||
+ (1 - S(" \t\n\r")) ^ 1 -- Unquoted values | ||
local pair = full_key * ws * eq * ws * Cs(value) -- Capture the full key-value pair | ||
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-- Main pattern | ||
pattern = Ct(ws * pair * (ws * pair) ^ 0 * ws) | ||
end | ||
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---@return trouble.Config | ||
function M.parse(input) | ||
---@type string[] | ||
local t = pattern:match(input) | ||
if not t then | ||
error("Invalid input: " .. input) | ||
end | ||
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-- Convert list to a table of key-value pairs | ||
local parts = {} ---@type string[] | ||
for i = 1, #t, 2 do | ||
local k = t[i] | ||
local v = t[i + 1] | ||
parts[#parts + 1] = string.format("{%q,%s}", k, v) | ||
end | ||
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local chunk = loadstring("return {" .. table.concat(parts, ", ") .. "}") | ||
if not chunk then | ||
error("Failed to parse input: " .. input) | ||
end | ||
local ret = {} | ||
---@diagnostic disable-next-line: no-unknown | ||
for _, pair in pairs(chunk()) do | ||
M.set(ret, pair[1], pair[2]) | ||
end | ||
return ret | ||
end | ||
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---@param t table | ||
---@param dotted_key string | ||
---@param value any | ||
function M.set(t, dotted_key, value) | ||
local keys = vim.split(dotted_key, ".", { plain = true }) | ||
for i = 1, #keys - 1 do | ||
local key = keys[i] | ||
t[key] = t[key] or {} | ||
if type(t[key]) ~= "table" then | ||
t[key] = {} | ||
end | ||
t = t[key] | ||
end | ||
t[keys[#keys]] = value | ||
end | ||
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return M |
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@@ -0,0 +1,50 @@ | ||
local Parser = require("trouble.config.parser") | ||
describe("Input is parsed correctly", function() | ||
local tests = { | ||
{ | ||
input = [[a = "b" foo = true bar=1 c = "g"]], | ||
expected = { a = "b", foo = true, bar = 1, c = "g" }, | ||
}, | ||
{ | ||
input = [[a.b = "c"]], | ||
expected = { a = { b = "c" } }, | ||
}, | ||
{ | ||
input = [[x.y.z = "value" a.b = 2]], | ||
expected = { x = { y = { z = "value" } }, a = { b = 2 } }, | ||
}, | ||
{ | ||
input = [[test="hello world"]], | ||
expected = { test = "hello world" }, | ||
}, | ||
{ | ||
input = [[one.two.three.four = 4]], | ||
expected = { one = { two = { three = { four = 4 } } } }, | ||
}, | ||
{ | ||
input = [[a="b" c="d" e.f="g" h.i.j="k"]], | ||
expected = { a = "b", c = "d", e = { f = "g" }, h = { i = { j = "k" } } }, | ||
}, | ||
{ | ||
input = [[empty = "" nonempty="not empty"]], | ||
expected = { empty = "", nonempty = "not empty" }, | ||
}, | ||
{ | ||
input = [[a.b="c" a = "b"]], | ||
expected = { a = "b" }, -- This test is tricky as it will overwrite the first value of 'a' | ||
}, | ||
{ | ||
input = [[a="b" a.b="c"]], | ||
expected = { a = { b = "c" } }, -- This test is tricky as it will overwrite the first value of 'a' | ||
}, | ||
} | ||
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for _, test in ipairs(tests) do | ||
it("parses " .. test.input, function() | ||
local actual = Parser.parse(test.input) | ||
assert.same(test.expected, actual) | ||
end) | ||
end | ||
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return tests | ||
end) |