path: root/lua/chupacabra/repl.lua

local chupacabra = require("chupacabra")

-- not a great, but a passable repl
local function table_to_string(t)
    local str = "["
    for i, v in ipairs(t) do
        if i > 1 then
            str = str .. " "
        end
        str = str .. tostring(v)
    end
    str = str .. "]"
    return str
end

local stack = {}

local function scratch(input)
    local output = chupacabra.run(input, {})
    table.insert(stack, {input = input, output = output})
end

local function scratch_out()
    for i, entry in ipairs(stack) do
        print("   input: " .. entry.input)
        if type(entry.output) == "table" then
            print("  output: " .. table_to_string(entry.output))
        else
            print("  output: " .. tostring(entry.output))
        end
    end
end

while true do
    io.write("> ")
    local input = io.read()
    if input == "bye" then
        break
    end
    scratch(input)
    scratch_out()
    stack = {}
end