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Changed a few things
* Integrated # and ~ decorators into the expression system. Created associated operators. * # and ~ decorators only affect their current line. That's more useful... * Fix our priority system to evaluate left-to-right instead of right-to-left (if there was a reason why I did it this way initially, I don't remember it so ¯\_(ツ)_/¯) * a lotta internal changes Various other small adjustments, see the diff of REFERENCE.md for details.
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31 changed files with 894 additions and 343 deletions
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@ -1,202 +1,7 @@
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local eval
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local truthy, merge_state, to_lua, escape, get_variable, eval_text_callback
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local truthy, merge_state, escape, get_variable, eval_text_callback, tags, events
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local run_line, run_block
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local function post_process_text(state, text)
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-- remove trailing spaces
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if state.feature_flags["strip trailing spaces"] then
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local final = text[#text]
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if final then
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final.text = final.text:match("^(.-) *$")
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if final.text == "" then
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table.remove(text)
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end
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end
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end
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-- remove duplicate spaces
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if state.feature_flags["strip duplicate spaces"] then
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for i=1, #text-1 do
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local a, b = text[i], text[i+1]
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local na = #a.text:match(" *$")
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local nb = #b.text:match("^ *")
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if na > 0 and nb > 0 then -- remove duplicated spaces from second element first
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b.text = b.text:match("^ *(.-)$")
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end
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if na > 1 then
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a.text = a.text:match("^(.- ) *$")
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end
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end
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end
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end
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--- tag management
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local tags = {
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--- push new tags on top of the stack, from Anselme values
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push = function(self, state, val)
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local new = {}
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-- copy
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local last = self:current(state)
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for k,v in pairs(last) do new[k] = v end
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-- merge with new values
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if val.type ~= "list" then val = { type = "list", value = { val } } end
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for k, v in pairs(to_lua(val)) do new[k] = v end
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-- add
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table.insert(state.interpreter.tags, new)
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return self:len(state)
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end,
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--- same but do not merge with last stack item
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push_lua_no_merge = function(self, state, val)
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table.insert(state.interpreter.tags, val)
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return self:len(state)
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end,
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-- pop tag table on top of the stack
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pop = function(self, state)
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table.remove(state.interpreter.tags)
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end,
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--- return current lua tags table
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current = function(self, state)
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return state.interpreter.tags[#state.interpreter.tags] or {}
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end,
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--- returns length of tags stack
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len = function(self, state)
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return #state.interpreter.tags
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end,
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--- pop item until we reached desired stack length
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-- try to prefer this to pop if possible, so in case we mess up the stack somehow it will restore the stack to a good state
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-- (we may allow tag push/pop from the user side at some point)
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trim = function(self, state, len)
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while #state.interpreter.tags > len do
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self:pop(state)
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end
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end
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}
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--- event buffer management
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-- i.e. only for text and choice events
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local events = {
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--- add a new element to the event buffer
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-- will flush if needed
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-- returns true in case of success
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-- returns nil, err in case of error
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append = function(self, state, type, data)
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if state.interpreter.event_capture_stack[type] then
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local r, e = state.interpreter.event_capture_stack[type][#state.interpreter.event_capture_stack[type]](data)
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if not r then return r, e end
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else
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local r, e = self:make_space_for(state, type)
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if not r then return r, e end
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if not state.interpreter.event_buffer then
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state.interpreter.event_type = type
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state.interpreter.event_buffer = {}
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end
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table.insert(state.interpreter.event_buffer, data)
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end
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return true
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end,
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--- add a new item in the last element (a list of elements) of the event buffer
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-- will flush if needed
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-- will use default or a new list if buffer is empty
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-- returns true in case of success
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-- returns nil, err in case of error
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append_in_last = function(self, state, type, data, default)
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local r, e = self:make_space_for(state, type)
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if not r then return r, e end
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if not state.interpreter.event_buffer then
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r, e = self:append(state, type, default or {})
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if not r then return r, e end
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end
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table.insert(state.interpreter.event_buffer[#state.interpreter.event_buffer], data)
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return true
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end,
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--- start capturing events of a certain type
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-- when an event of the type is appended, fn will be called with this event data
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-- and the event will not be added to the event buffer
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-- fn returns nil, err in case of error
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push_capture = function(self, state, type, fn)
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if not state.interpreter.event_capture_stack[type] then
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state.interpreter.event_capture_stack[type] = {}
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end
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table.insert(state.interpreter.event_capture_stack[type], fn)
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end,
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--- stop capturing events of a certain type.
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-- must be called after a push_capture
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-- this is handled by a stack so nested capturing is allowed.
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pop_capture = function(self, state, type)
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table.remove(state.interpreter.event_capture_stack[type])
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if #state.interpreter.event_capture_stack[type] == 0 then
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state.interpreter.event_capture_stack[type] = nil
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end
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end,
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-- flush event buffer if it's neccessary to push an event of the given type
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-- returns true in case of success
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-- returns nil, err in case of error
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make_space_for = function(self, state, type)
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if state.interpreter.event_buffer and state.interpreter.event_type ~= type and not state.interpreter.event_capture_stack[type] then
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return self:flush(state)
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end
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return true
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end,
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--- flush events and send them to the game if possible
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-- returns true in case of success
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-- returns nil, err in case of error
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flush = function(self, state)
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while state.interpreter.event_buffer do
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local type, buffer = state.interpreter.event_type, state.interpreter.event_buffer
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state.interpreter.event_type = nil
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state.interpreter.event_buffer = nil
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state.interpreter.skip_choices_until_flush = nil
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-- extract some needed state data for each choice block
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local choices
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if type == "choice" then
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choices = {}
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for _, c in ipairs(buffer) do
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table.insert(choices, c._state)
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c._state = nil
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end
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end
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-- text post processing
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if type == "text" then
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post_process_text(state, buffer)
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end
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if type == "choice" then
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for _, c in ipairs(buffer) do
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post_process_text(state, c)
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end
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end
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-- yield event
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coroutine.yield(type, buffer)
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-- run choice
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if type == "choice" then
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local sel = state.interpreter.choice_selected
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state.interpreter.choice_selected = nil
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if not sel or sel < 1 or sel > #choices then
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return nil, "invalid choice"
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else
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local choice = choices[sel]
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-- execute in expected tag & event capture state
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local capture_state = state.interpreter.event_capture_stack
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state.interpreter.event_capture_stack = {}
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local i = tags:push_lua_no_merge(state, choice.tags)
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local _, e = run_block(state, choice.block)
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tags:trim(state, i-1)
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state.interpreter.event_capture_stack = capture_state
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if e then return nil, e end
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-- we discard return value from choice block as the execution is delayed until an event flush
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-- and we don't want to stop the execution of another function unexpectedly
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end
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end
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end
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return true
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end
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}
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-- returns var in case of success and there is a return
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-- return nil in case of success and there is no return
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-- return nil, err in case of error
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@ -236,10 +41,7 @@ run_line = function(state, line)
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local v2, e2 = events:append_in_last(state, "choice", event, { _state = choice_block_state })
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if not v2 then return v2, e2 end
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end)
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v, e = eval_text_callback(state, line.text, function(text)
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local v2, e2 = events:append_in_last(state, "choice", { text = text, tags = currentTags }, { _state = choice_block_state })
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if not v2 then return v2, e2 end
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end)
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v, e = eval(state, line.text)
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events:pop_capture(state, "text")
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if not v then return v, ("%s; at %s"):format(e, line.source) end
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elseif line.type == "tag" then
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@ -257,12 +59,7 @@ run_line = function(state, line)
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elseif line.type == "text" then
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local v, e = events:make_space_for(state, "text") -- do this before any evaluation start
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if not v then return v, ("%s; in automatic event flush at %s"):format(e, line.source) end
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local currentTags = tags:current(state)
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v, e = eval_text_callback(state, line.text, function(text)
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-- why you would want to send a non-text event from there, I have no idea, but I'm not going to stop you
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local v2, e2 = events:append(state, "text", { text = text, tags = currentTags })
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if not v2 then return v2, e2 end
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end)
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v, e = eval(state, line.text)
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if not v then return v, ("%s; at %s"):format(e, line.source) end
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elseif line.type == "flush_events" then
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local v, e = events:flush(state)
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@ -409,7 +206,7 @@ local interpreter = {
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package.loaded[...] = interpreter
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eval = require((...):gsub("interpreter$", "expression"))
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local common = require((...):gsub("interpreter$", "common"))
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truthy, merge_state, to_lua, get_variable, eval_text_callback = common.truthy, common.merge_state, common.to_lua, common.get_variable, common.eval_text_callback
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truthy, merge_state, tags, get_variable, eval_text_callback, events = common.truthy, common.merge_state, common.tags, common.get_variable, common.eval_text_callback, common.events
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escape = require((...):gsub("interpreter%.interpreter$", "parser.common")).escape
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return interpreter
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