returns true if there is a function to highlight used to highlight <name> in 'function <name>' note: sample line (without quotes): "\tfunction asdf()

UAX #31 defines ID_Continue as [[:ID_Start:][:Mn:][:Mc:][:Nd:][:Pc:][:Other_ID_Continue:]--[:Pattern_Syntax:]--[:Pattern_White_Space:]]

UAX #31 defines ID_Start as [[:L:][:Nl:][:Other_ID_Start:]--[:Pattern_Syntax:]--[:Pattern_White_Space:]]

检测是否在拷贝状态，因为拷贝可能有删除和添加一起，外部要做一个整体对待而识别*/

return whether this modification represents the FINAL step in a [possibly lengthy] multi-step Undo/Redo sequence */

This function checks for the start or a natural number without any symbols or operators as a prefix; the IsPrefixedNumberStart should be called immedi

Separator line

* Check that the given range is has transitions between character classes at both * ends and where the characters on the inside are word or punctuati

XID_Continue is ID_Continue modified for Normalization Form KC in UAX #31

Data lines in XPM can be terminated either with NUL or "

Returns true if Merge caused a significant change

look behind (from start of document to our start position) to determine current nesting level