<<-- TextLooksSupport.mesa>> <<-- written by Bill Paxton, February 1981>> <<-- last edit by Bill Paxton, December 22, 1981 1:57 pm>> <<-- Internal support interface for TextLooks>> <> DIRECTORY Inline, Mopcodes, TextLooks; TextLooksSupport: CEDAR DEFINITIONS IMPORTS Inline, Mopcodes SHARES TextLooks = BEGIN OPEN TextLooks; <<-- support procedures>> BaseRun: PROC [x: BaseRuns, index: Offset, lower: NAT _ 0, upper: NAT _ LAST[NAT]] RETURNS [NAT]; ExtractRuns: PROC [base: BaseRuns, ref: Runs, start, len: Offset, index: NAT _ 0] RETURNS [NAT]; -- value is next index CountRunsAfterChanges: PROC [ref: Runs, start, len: Offset, limit: Offset _ MaxOffset, remove, add: Looks, merge: BOOLEAN _ FALSE, firstLooks: Looks _ noLooks] RETURNS [count: NAT, nonempty: BOOLEAN, lastLooks: Looks]; ExtractRunsAfterChanges: PROC [base: BaseRuns, ref: Runs, remove, add: Looks, start: Offset, len: Offset, index: NAT _ 0] RETURNS [NAT]; -- value is next index CopyRuns: PROC [to, from: BaseRuns, toLoc, fromLoc, nRuns: NAT]; MakeRun: PROC [len: Offset] RETURNS [new: Runs]; TryFlatSubstr: PROC [base: Runs, start, len: Offset, limit: Offset _ FlatMax] RETURNS [BaseRuns]; TryFlatConcat: PROC [base, rest: Runs, baseLen, restLen: Offset] RETURNS [new: BaseRuns]; TryFlatConcatRest: PROC [base, rest: Runs, baseLen, restLen, numRuns: Offset, merge: BOOLEAN, looks: Looks] RETURNS [BaseRuns]; ModifyLooks: PROC [old, remove, add: Looks] RETURNS [Looks]; <<-- modified looks are == (old & ~remove) v add>> MergeChanges: PROC [oldrem, oldadd, rem, add: Looks] RETURNS [newrem, newadd: Looks]; <<-- ((lks & ~oldrem) v oldadd) & ~rem) v add ==>> <<-- lks & ~(oldrem v rem)) v ((oldadd & ~rem) v add>> <<-- thus, newrem _ oldrem v rem, newadd _ (oldadd & ~rem) v add>> LooksAND: PROC [looks1, looks2: Looks] RETURNS [Looks]; <<-- compute looks1 & looks2>> LooksOR: PROC [looks1, looks2: Looks] RETURNS [Looks]; <<-- compute looks1 v looks2>> LooksNOT: PROC [looks: Looks] RETURNS [Looks]; <<-- compute ~looks>> <<-- inlines>> TbaseSize: PROC [x: BaseRuns] RETURNS [Offset] = INLINE { RETURN [IF x.length=0 THEN 0 ELSE x[x.length-1].after] }; InsertRun: PROC [base: BaseRuns, len: Offset, looks: Looks, index: NAT] RETURNS [NAT]; NewBase: PROC [runs: NAT] RETURNS [BaseRuns]; FindBaseRuns: PROC [x: BaseRuns, start, len: Offset] RETURNS [first, last: NAT]; BaseRunLengths: PROC [x: BaseRuns, start, len: Offset, first, last: NAT] RETURNS [firstLen, lastLen: Offset]; <<-- miscellaneous support routines>> Pair: TYPE = MACHINE DEPENDENT RECORD [low,high: CARDINAL]; Short: PROC [x: Offset] RETURNS [NAT] = TRUSTED MACHINE CODE { <<-- quick range check and shortening>> Mopcodes.zLI1; Mopcodes.zBNDCK; Mopcodes.zPOP; Mopcodes.zLINI; Mopcodes.zBNDCK}; CheckLongSub: PROC [x,y: Offset] RETURNS [Offset] = INLINE { RETURN [NonNeg[x-y]] }; NonNeg: PROC [x: Offset] RETURNS [Offset] = TRUSTED MACHINE CODE { Mopcodes.zLINI; Mopcodes.zBNDCK}; <<-- ***** Initialization>> StartTextLooksSupport: PROC; -- for initialization only END.