diff options
Diffstat (limited to 'util.lua')
| -rw-r--r-- | util.lua | 56 |
1 files changed, 56 insertions, 0 deletions
@@ -316,4 +316,60 @@ util.visual_chars_in_line = function(win, line, nchars) return line_len end +--- Utility table function +util.table = {} + +--- Recursively copy a table and all its members. +-- @param tbl the table to copy +-- @return a deep copy of the table +function util.table.deep_copy(tbl) + local cpy = {} + for k, v in pairs(tbl) do + if type(v) ~= 'table' then + cpy[k] = v + else + cpy[k] = util.table.deep_copy(v) + end + end + + for i, v in ipairs(tbl) do + if type(v) ~= 'table' then + cpy[i] = v + else + cpy[i] = util.table.deep_copy(v) + end + end + return cpy +end + +--- Recursively merge two tables. +-- This method modifies the weak table, if this is not intended make sure you +-- use a deep copy of the weak table. +-- The members of the strong table override members of the weak one. +-- @param weak table which's members are potentially overridden +-- @param strong table which's members override ones from the weak table +-- @return the merged table +function util.table.merge(weak, strong) + -- merge named members + for k, v in pairs(strong) do + -- potentially override the weak member + if type(v) ~= 'table' then + weak[k] = v + else + weak[k] = util.table.merge(weak[k] or {}, v) + end + end + + -- merge numbered members + for i, v in ipairs(strong) do + -- potentially override the weak member + if type(v) ~= 'table' then + weak[i] = v + else + weak[i] = util.table.merge(weak[i] or {}, v) + end + end + return weak +end + return util |