View Issue Details
| ID | Project | Category | View Status | Date Submitted | Last Update |
|---|---|---|---|---|---|
| 0000340 | luatex | feature request | public | 2010-03-04 14:32 | 2010-03-12 15:46 |
| Reporter | patrick | Assigned To | Taco | ||
| Priority | normal | Severity | feature | Reproducibility | N/A |
| Status | closed | Resolution | fixed | ||
| Target Version | 0.60.0 | Fixed in Version | 0.51.0 | ||
| Summary | 0000340: Call line breaking algorithm from lua | ||||
| Description | I would like to create (from inside Lua) a nodelist and afterwards do something like new_head = tex.linebreak_nodelist(my_nodelist_head,parameters) and the result is a nodelist or a box that I can put into TeX's main vertical list or just find out how big it is. That means, I would like to do \setbox1\vbox{my paragraph} without TeX's input language and have the result in tex.box[1] | ||||
| Tags | No tags attached. | ||||
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There is a new lua function in TRUNK and the bin on Hans' ftp: local <node> nodelist, <sp> founddepth = tex.linebreak(<node> listhead, <table> parameters) The understood parameters are as follows: d = false, % boolean pardir = 'TLT', % dir pretolerance = 100, % number tracingparagraphs = 0, % number tolerance = 200, % number looseness = 0, % number hyphenpenalty = 50, % number exhyphenpenalty = 50, % number pdfadjustspacing = 0, % number adjdemerits = 10000, % number pdfprotrudechars = 0, % number linepenalty = 10, % number lastlinefit = 0, % number doublehyphendemerits = 10000, % number finalhyphendemerits = 5000, % number hangafter = 1, % number interlinepenalty = 0, % number clubpenalty = 150, % number displaywidowpenalty = 150, % number widowpenalty = 150, % number brokenpenalty = 100, % number emergencystretch = 0, % sp hangindent = 0, % sp hsize = 65536*72*4, % sp leftskip = spec, % glue_spec node rightskip = spec, % glue_spec node pdfeachlineheight = -65536000, % sp pdfeachlinedepth = -65536000, % sp pdffirstlineheight =-65536000, % sp pdflastlinedepth = -65536000, % sp pdfignoreddimen = -65536000, % sp The 'd' is whether or not this should be taken as a pre-math-display subparagraph, everything else should be fairly obvious except for the last 5. The four pdf...line... things are ignored if their value equals pdfignoreddimen. It is your own job to make sure that 'listhead' is a proper paragraph list: this function does not add any nodes to it. To be exact, if you want to replace the core line breaking, you may have to do the following (when you are not actually working in the pre_line_break or line_break callback, or when the original list starting at listhead was generated in horizontal mode): * add an 'indent box' and perhaps a local_par node at the start (only if you need them) * replace any found final glue by an infinite penalty (or add such a penalty, if the last node is not a glue). * add a glue node for the \parfillskip after that penalty. The result is a node list, it still needs to be vpacked if you want to assign it to a box. There are a few things you cannot interface using this function, because there is no lua glue for the underlying data yet: \parshape \interlinepenalties \clubpenalties \displaywidowpenalties \widowpenalties You can't influence font expansion other than via 'pdfadjustspacing', because the settings for that take place elsewhere. The same is true for hbadness and hfuzz etc. All these are in the hpack() routine, and that fetches its own variables via globals. |
| Date Modified | Username | Field | Change |
|---|---|---|---|
| 2010-03-04 14:32 | patrick | New Issue | |
| 2010-03-04 15:37 | Taco | Assigned To | => Taco |
| 2010-03-04 15:37 | Taco | Status | new => assigned |
| 2010-03-04 15:37 | Taco | Target Version | => 0.60.0 |
| 2010-03-08 18:17 | Taco | Note Added: 0000463 | |
| 2010-03-08 18:17 | Taco | Status | assigned => resolved |
| 2010-03-08 18:17 | Taco | Resolution | open => fixed |
| 2010-03-12 15:46 | Taco | Fixed in Version | => 0.51.0 |
| 2010-03-12 15:46 | Taco | Status | resolved => closed |
