83 lines
2.0 KiB
Lua
83 lines
2.0 KiB
Lua
-- State transitions while colorizing a single line.
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-- Just for comments and strings.
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-- Limitation: each fragment gets a uniform color so we can only change color
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-- at word boundaries.
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Next_state = {
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normal={
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{prefix='--[[', target='block_comment'}, -- only single-line for now
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{prefix='--', target='comment'},
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-- these don't mostly work well until we can change color within words
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-- {prefix='"', target='dstring'},
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-- {prefix="'", target='sstring'},
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{prefix='[[', target='block_string'}, -- only single line for now
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},
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dstring={
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{suffix='"', target='normal'},
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},
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sstring={
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{suffix="'", target='normal'},
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},
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block_string={
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{suffix=']]', target='normal'},
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},
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block_comment={
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{suffix=']]', target='normal'},
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},
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-- comments are a sink
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}
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Comment_color = {r=0, g=0, b=1}
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String_color = {r=0, g=0.5, b=0.5}
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Divider_color = {r=0.7, g=0.7, b=0.7}
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Colors = {
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normal=Text_color,
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comment=Comment_color,
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sstring=String_color,
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dstring=String_color,
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block_string=String_color,
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block_comment=Comment_color,
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}
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Current_state = 'normal'
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function initialize_color()
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--? print('new line')
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Current_state = 'normal'
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end
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function select_color(frag)
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--? print('before', '^'..frag..'$', Current_state)
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switch_color_based_on_prefix(frag)
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--? print('using color', Current_state, Colors[Current_state])
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App.color(Colors[Current_state])
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switch_color_based_on_suffix(frag)
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--? print('state after suffix', Current_state)
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end
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function switch_color_based_on_prefix(frag)
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if Next_state[Current_state] == nil then
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return
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end
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frag = rtrim(frag)
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for _,edge in pairs(Next_state[Current_state]) do
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if edge.prefix and starts_with(frag, edge.prefix) then
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Current_state = edge.target
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break
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end
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end
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end
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function switch_color_based_on_suffix(frag)
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if Next_state[Current_state] == nil then
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return
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end
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frag = rtrim(frag)
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for _,edge in pairs(Next_state[Current_state]) do
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if edge.suffix and ends_with(frag, edge.suffix) then
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Current_state = edge.target
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break
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end
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end
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end
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