105 lines
2.3 KiB
Lua
105 lines
2.3 KiB
Lua
---@class lookForward
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local m = {}
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--- 是否是空白符
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---@param char string
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---@param inline? boolean # 必须在同一行中（排除换行符）
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function m.isSpace(char, inline)
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if inline then
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if char == ' '
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or char == '\t' then
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return true
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end
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else
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if char == ' '
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or char == '\n'
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or char == '\r'
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or char == '\t' then
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return true
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end
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end
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return false
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end
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--- 跳过空白符
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---@param text string
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---@param offset integer
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---@param inline? boolean # 必须在同一行中（排除换行符）
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function m.skipSpace(text, offset, inline)
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for i = offset, 1, -1 do
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local char = text:sub(i, i)
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if not m.isSpace(char, inline) then
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return i
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end
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end
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return 0
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end
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function m.findWord(text, offset)
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for i = offset, 1, -1 do
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if not text:sub(i, i):match '[%w_\x80-\xff]' then
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if i == offset then
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return nil
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end
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return text:sub(i + 1, offset), i + 1
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end
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end
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return text:sub(1, offset), 1
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end
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function m.findSymbol(text, offset)
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for i = offset, 1, -1 do
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local char = text:sub(i, i)
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if m.isSpace(char) then
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goto CONTINUE
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end
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if char == '.'
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or char == ':'
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or char == '('
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or char == ','
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or char == '['
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or char == '='
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or char == '{' then
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return char, i
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else
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return nil
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end
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::CONTINUE::
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end
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return nil
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end
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function m.findTargetSymbol(text, offset, symbol)
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offset = m.skipSpace(text, offset)
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for i = offset, 1, -1 do
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local char = text:sub(i - #symbol + 1, i)
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if char == symbol then
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return i - #symbol + 1
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else
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return nil
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end
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end
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return nil
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end
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---@param text string
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---@param offset integer
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---@param inline? boolean # 必须在同一行中（排除换行符）
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function m.findAnyOffset(text, offset, inline)
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for i = offset, 1, -1 do
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local c = text:sub(i, i)
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if inline then
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if c == '\r'
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or c == '\n' then
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return nil
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end
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end
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if not m.isSpace(c) then
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return i
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end
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end
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return nil
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end
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return m
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