86 lines
2.0 KiB
Lua
86 lines
2.0 KiB
Lua
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local core = require "core"
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local syntax = require "core.syntax"
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local config = require "core.config"
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local tokenizer = require "core.tokenizer"
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local Object = require "core.object"
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local Highlighter = Object:extend()
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function Highlighter:new(doc)
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self.doc = doc
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self:reset_syntax()
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-- init incremental syntax highlighting
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core.add_thread(function()
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while true do
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if self.last_valid_line > self.max_wanted_line then
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self.max_wanted_line = 0
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coroutine.yield(1 / config.fps)
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else
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local max = math.min(self.last_valid_line + 40, self.max_wanted_line)
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for i = self.last_valid_line, max do
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local state = (i > 1) and self.lines[i - 1].state
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local line = self.lines[i]
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if not (line and line.init_state == state) then
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self.lines[i] = self:tokenize_line(i, state)
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end
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end
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self.last_valid_line = max + 1
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core.redraw = true
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coroutine.yield()
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end
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end
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end, self)
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end
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function Highlighter:reset_syntax()
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local syn = syntax.get(self.doc.filename or "")
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if self.syntax ~= syn then
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self.syntax = syn
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self.lines = {}
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self.last_valid_line = 1
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self.max_wanted_line = 0
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end
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end
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function Highlighter:invalidate(idx)
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self.last_valid_line = idx
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end
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function Highlighter:tokenize_line(idx, state)
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local line = {}
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line.init_state = state
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line.text = self.doc.lines[idx]
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line.tokens, line.state = tokenizer.tokenize(self.syntax, line.text, state)
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return line
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end
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function Highlighter:get_line(idx)
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local line = self.lines[idx]
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if not line or line.text ~= self.doc.lines[idx] then
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local prev = self.lines[idx - 1]
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line = self:tokenize_line(idx, prev and prev.state)
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self.lines[idx] = line
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self.last_valid_line = math.min(self.last_valid_line, idx)
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end
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self.max_wanted_line = math.max(self.max_wanted_line, idx)
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return line
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end
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function Highlighter:each_token(idx)
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return tokenizer.each_token(self:get_line(idx).tokens)
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end
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return Highlighter
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