277 lines
8.4 KiB
Lua
277 lines
8.4 KiB
Lua
require("nellie.interpreter")
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-- A stream of text (kind of)
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-- with some helping methods
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Reader = class("Reader")
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-- Construct a reader from
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function Reader:new(text)
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assert_type("string")(text,"Arg 'text' #1: %s")
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self.text = text
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end
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-- Get the substring of the readers text in a bounds
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function Reader:get(first,final)
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assert_type("number")(first,"Arg 'first' #1: %s")
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assert_type("number","nil")(final,"Arg 'final' #2: %s")
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return self.text:sub(first,final)
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end
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-- Match on the reader's text from an index
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function Reader:find(pattern,init)
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assert_type("string")(pattern,"Arg 'pattern' #1: %s")
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assert_type("number","nil")(init,"Arg 'init' #2: %s")
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return self.text:find(pattern,init)
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end
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function Reader:match(pattern,init)
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assert_type("string")(pattern,"Arg 'pattern' #1: %s")
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assert_type("number")(init,"Arg 'init' #2: %s")
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return self.text:match(pattern,init)
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end
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-- A range of text being considered
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-- like a cursor
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Range = class("Range")
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-- Construct a range of text from a reader and bounds
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function Range:new(reader,first,final)
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assert_meta(Reader)(reader)
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assert_type("number","nil")(first,"Arg 'first' #1: %s")
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assert_type("number","nil")(final,"Arg 'final' #2: %s")
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self.reader = reader
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self.first = first
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self.final = final
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end
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function Range:text()
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return self.reader:get(self.first or 1,self.final)
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end
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function Range:find(pattern)
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return self.reader:find(pattern,self.first)
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end
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function Range:move(first,final)
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assert_type("number","nil")(first,"Arg 'first' #1: %s")
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assert_type("number","nil")(final,"Arg 'final' #2: %s")
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self.first = first
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self.final = final
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-- note that this function returns itself
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return self
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end
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--[[
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A class which parses text using the 'consumer-meal'
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model.
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]]
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Consumer = class("Consumer")
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function Consumer:new(content)
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self.range = Range(Reader(content))
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self.col = 1
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self.row = 1
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end
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function Consumer:remaining()
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return self.range:text()
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end
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function Consumer:mark()
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end
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-- From a table of actions of patterns,
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-- consume the earliest pattern (index)
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-- and call the value
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function Consumer:consumePatterns(patterns,state)
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-- t: {string = function...}
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assert_type("table")(patterns,"Arg 't' #1: %s")
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if not next(patterns) then
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error("The match table cannot be empty!",2)
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end
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for index,func in pairs(patterns) do
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assert_type("string")(index,"Bad 't' index: %s")
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assert_type("function")(func,"Bad 't' item: %s")
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end
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local origin = self.range.first or 1
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-- Get the next earliest match
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local findex,ffinal,fpattern,ffunc,fexcess -- TODO: make this not be a bunch of locals. New class?
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for pattern,new_func in pairs(patterns) do
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local new_index,new_final = self.range:find(pattern)
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if new_index and
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((not findex) or (findex > new_index))
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then
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if not new_index then return end
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findex = new_index
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ffinal = new_final
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fpattern = pattern
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ffunc = new_func
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fexcess = self.range.reader:get(
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self.range.first or 1,
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new_final - 1
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)
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end
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end
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-- Pass into the func
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if not ffunc then
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return nil
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end
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assert(findex) assert(ffinal)
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self.range:move(ffinal+1) -- Move range to after the match
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local fmatch = self.range.reader:match(fpattern,findex)
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-- Pass back consumed result to
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local sum = self.range.reader:get(origin+1,self.range.first)
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:gsub("\r\n","\n")
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:gsub("\r","\n")
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for char in sum:gmatch(".") do
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if char == "\n" then
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self.row = self.row + 1
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self.col = 1
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else
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self.col = self.col + 1
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end
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end
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return ffunc(fexcess,fmatch,state)
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end
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-- Interpret some text
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function Parse(content,uri,chain)
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-- LOCALS
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-- So that all functions have access to eachother
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local consume,
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consumeExpression,
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consumeBlock
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local consumer = Consumer(content)
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local function expression(...)
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return Expression(...):locate(
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string.format(
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"%i:%i",
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consumer.row,
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consumer.col
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),uri)
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end
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local baseExpression = expression()
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local patterns = {}
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patterns.contentClose = "$"
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-- The pattern for words inbetween expressions
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patterns.expressionWord = "(.*)"
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-- The patterns to open and close expressions,
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-- the words scattered inbetween them will be matches
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patterns.expressionOpen = "%("
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patterns.expressionClose = "%)"
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patterns.subExpressionOpen = "%:"
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patterns.subExpressionClose = "%,"
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patterns.blockOpen = "%{"
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patterns.blockClose = "%}"
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patterns.blockDelimiter = "[;]+"
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patterns.newLine = "[\n\r]+"
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patterns.singleLineString = "\""
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patterns.named = "'"
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patterns.multiLineStringOpen = "%[%["
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patterns.multiLineStringClose = "%]%]"
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patterns.uriOpen = "<"
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patterns.uriClose = ">"
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patterns.singleLineComment = "//"
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patterns.multiLineCommentOpen = "/%*"
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patterns.multiLineCommentOpen = "%*/"
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patterns.colonSyntax = ":"
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-- TODO: I don't like that this structure does: open(stuff;close) instead of open(stuff)close
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-- TODO: current:insert() is repeated in EVERY meal. I wonder if this should be fixed -__-
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local expressionMeals = {
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[patterns.singleLineString] = function(words,_,current)
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current:insert(words,consumer:consumePatterns({
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[patterns.singleLineString] = function(words,_)
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return expression({"text",Expression({words})})
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end
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}))
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end,
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[patterns.named] = function(words,_,current)
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current:insert(words,consumer:consumePatterns({
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[patterns.named] = function(words,_)
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return expression({"the",Expression({words})})
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end
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}))
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end,
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[patterns.multiLineStringOpen] = function(words,_,current)
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current:insert(words,consumer:consumePatterns({
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["[\n\r]"] = function()
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error("Incomplete string literal")
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end,
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[patterns.multiLineStringClose] = function(words,_)
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return expression({"text",Expression({words})})
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end
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}))
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end,
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[patterns.uriOpen] = function(words,_,current)
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current:insert(words,consumer:consumePatterns({
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["[\n\r]"] = function()
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current:error("Incomplete URI literal")
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end,
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[patterns.uriClose] = function(path)
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return read(path)
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end
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}))
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end,
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[patterns.expressionOpen] = function(words,_,current)
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current:insert(words,consumeExpression())
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end,
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[patterns.singleLineComment] = function(words,_,current)
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--current:insert(words) -- Consume what was left
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consumer:consumePatterns({
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[patterns.newLine] = function() end
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})
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end,
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[patterns.multiLineCommentOpen] = function(words,_,current)
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current:insert(words)
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consumer:consumePatterns({
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[patterns.multiLineCommentClose] = function() end
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})
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end,
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[patterns.colonSyntax] = function(words,_,current)
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current:insert(words,consumeExpression())
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end,
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[patterns.blockOpen] = function(words,_,current)
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current:insert(words,consumeBlock())
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end,
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}
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-- Consume a {} block of code
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function consumeBlock(closing_pattern)
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closing_pattern = closing_pattern or patterns.blockClose
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local expressions = {}
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local current = expression()
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local loop = true
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while loop do
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local remaining = consumer:remaining()
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local expr = consumer:consumePatterns(union(expressionMeals,{
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[patterns.blockDelimiter] = function(words,_)
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current:insert(words)
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if current:empty() then
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--error("Extravenous semicolon.")
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else
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table.insert(expressions,current)
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end
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current = expression()
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end,
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[closing_pattern] = function(words,_)
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current:insert(words)
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loop = false
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end,
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}),current)
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end
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if #current.items ~= 0 then
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table.insert(expressions,current)
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end
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return expression(expressions)
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end
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function consumeExpression()
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local current = expression()
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-- Loop, adding new expressions and words,
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-- until closing that is
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local loop = true
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while loop do
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local remaining = consumer:remaining()
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local expr = consumer:consumePatterns(union(expressionMeals,{
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[patterns.expressionClose] = function(words,_,_current)
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current:insert(words)
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loop = false
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end
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}),current)
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-- This single line below made me procrastinate life for a total of 4 hours on instagram reels; lock in.
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-- if not expr then print("brk") break end -- Since now closing
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end
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return current
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end
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return consumeBlock(patterns.contentClose)
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-- TODO: check for later expressions please?
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end |