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