sys.apis.minify.Util.lua

--
-- Util.lua
--
-- Provides some common utilities shared throughout the project.
--

local function lookupify(tb)
    for _, v in pairs(tb) do
        tb[v] = true
    end
    return tb
end


local function CountTable(tb)
    local c = 0
    for _ in pairs(tb) do c = c + 1 end
    return c
end


local function PrintTable(tb, atIndent)
    if tb.Print then
        return tb.Print()
    end
    atIndent = atIndent or 0
    local useNewlines = (CountTable(tb) > 1)
    local baseIndent = string.rep('    ', atIndent+1)
    local out = "{"..(useNewlines and '\n' or '')
    for k, v in pairs(tb) do
        if type(v) ~= 'function' then
        --do
            out = out..(useNewlines and baseIndent or '')
            if type(k) == 'number' then
                --nothing to do
            elseif type(k) == 'string' and k:match("^[A-Za-z_][A-Za-z0-9_]*$") then
                out = out..k.." = "
            elseif type(k) == 'string' then
                out = out.."[\""..k.."\"] = "
            else
                out = out.."["..tostring(k).."] = "
            end
            if type(v) == 'string' then
                out = out.."\""..v.."\""
            elseif type(v) == 'number' then
                out = out..v
            elseif type(v) == 'table' then
                out = out..PrintTable(v, atIndent+(useNewlines and 1 or 0))
            else
                out = out..tostring(v)
            end
            if next(tb, k) then
                out = out..","
            end
            if useNewlines then
                out = out..'\n'
            end
        end
    end
    out = out..(useNewlines and string.rep('    ', atIndent) or '').."}"
    return out
end


local function splitLines(str)
    if str:match("\n") then
        local lines = {}
        for line in str:gmatch("[^\n]*") do
            table.insert(lines, line)
        end
        assert(#lines > 0)
        return lines
    else
        return { str }
    end
end


local function printf(fmt, ...)
    return print(string.format(fmt, ...))
end


return {
    PrintTable = PrintTable,
    CountTable = CountTable,
    lookupify  = lookupify,
    splitLines = splitLines,
    printf     = printf,
}