mirror of https://github.com/odrling/Aegisub
More auto4 docs work.
Originally committed to SVN as r249.
This commit is contained in:
Niels Martin Hansen
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Miscellaneous functions in Automation 4
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This document describes various functions that couldn't be placed in any of
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the other Automation 4 documents.
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---
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Getting the rendered size of a string
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This function might later on be part of a full rendering-interface for
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creating actual bitmaps of text.
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This function does NOT attempt to handle line breaks, automatic line breaking,
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fomatting override tags, vector drawings or anything else to that effect.
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If you need such functionality, you need to implement it yourself. (For now,
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at least.)
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function aegisub.text_extents(style, text)
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@style (table)
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A "style" class Subtitle Line table. This
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@text (string)
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The text to calculate the rendered size of.
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Returns: 4 values, all numbers.
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1. Width of text in pixels.
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2. Height of text in pixels.
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3. Descent of text in pixels.
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4. External leading of text in pixels.
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---
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@ -1,8 +1,8 @@
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Aegisub Automation documentation
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Version 4
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Copyright 2005-2006 Niels Martin Hansen
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THIS IS A DRAFT. SUBJECT TO CHANGE.
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Last updated: 2006-02-01 04:17 UTC+1
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THIS IS OUT OF DATE COMPARED TO THE REST OF THE DOCS!
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---
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@ -31,6 +31,11 @@ Automation allows you to:
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o Exporters write directly to a file stream, allowing you to generate
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those huge karaoke effects much faster!
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Automation runs in a true Unicode environment, meaning strings are internally
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represented as UTF-32, so you, as programmer, don't have to worry about text
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encodings, prefix encodings etc. to write scripts that can handle text in
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mostly any language of the world.
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---
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Scripts, files functions
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@ -41,7 +46,8 @@ being the master script, and the others being include files.
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Every script runs in a separate Lua interpreter, so separate scripts cannot
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communicate directly with each other. Scripts can share code by having common
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include files.
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include files. Scripts can share data by storing data in the subtitle files,
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either in the dialogue lines or in the Script Info headers.
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Files containing Automation scripts must in UTF-8 encoding, with or without
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BOM (Byte Order Mark). Compiled Lua scripts should also work, as long as all
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@ -65,9 +71,9 @@ The following four features can be implemented by an Automation script:
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The macro can create and display dialog windows to the user.
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For preformance-reasons, there is currently no provision for the script to
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enable/disable its menu item based on eg. the selection in the Aegisub
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subtitles grid.
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A macro can provide a function, that determines whether the macro cen be
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run, based on the current selection in the program, and the contents of
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the subtitles.
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- Export filter
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An export filter is presented as a filter in the Export dialog accessed
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@ -76,16 +82,10 @@ The following four features can be implemented by an Automation script:
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Styles and Script Info lines) in the subtitle file, and can add/modify/
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remove lines in those.
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The export filter can specify a static configuration dialog presented to
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the user in the Export UI.
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The export filter can specify a function that's run after the user selects
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the Export item on the File menu, but before the Export dialog is actually
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displayed. This function will be given access to the subtitles currently
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loaded. This is to feature customising the configuration dialog based on
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the contents of the subtitles.
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It is strongly discouraged to change anything but a single, private Script
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Info header line in the subtitles handed to this initialisation function.
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The export filter can provide a function, that returns a configuration
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dialog, which is presented to the user before the export is run. This
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function can access the subtitle data in order to customise the
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configuration dialog, before it's presented to the user.
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- File format reader
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It is not yet decided how the file format reader is accessed.
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@ -166,11 +166,11 @@ Version 2
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Version 3
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Using Lua as engine.
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Aegisub 1.10 was the last version to use Automation 3.
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Aegisub 1.09 was the last release-version to use Automation 3.
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(Tentative release date only!)
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Version 4
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Using Lua as engine
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Present in Aegisub 1.11 and later (tentative!)
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Present in Aegisub 1.10 and later (tentative!)
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Heavily expanded feature set, allowing a much wider range of modifications,
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and more direct integration into the Aegisub user interface.
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@ -0,0 +1,102 @@
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Automation 4 Progress Reporting and Debugging interface
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This document describes the functions used for reporting progress and
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outputting debug information during the running of a script.
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---
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Showing/hiding the progress dialog
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This function is used to show or hide the progress dialog.
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function aegisub.progress.show(do_show, can_cancel)
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@do_show (boolean)
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True if the dialog should be shown, false if it should be hidden.
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@can_cancel (boolean)
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Determines whether the Cancel button is shown. If you set this to true,
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you should remember to periodically test whether the script has been
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cancelled.
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Returns: nothing.
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---
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Setting the progress bar position
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function aegisub.progress.set(precent)
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@percent (number)
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The percentage completed.
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Returns: nothing.
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---
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Showing the current task
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Used to set a message describing the current task being done.
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function aegisub.progress.task(msg, ...)
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@msg (string)
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A format string used for the message.
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@...
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Parameters to the format string.
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Returns: nothing.
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---
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Setting the progress dialog title
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function aegisub.progress.title(title, ...)
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@title (string)
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A format string used for the title.
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@...
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Parameters to the format string.
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Returns: nothing.
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---
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Getting the "cancelled" status
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Call this function to determine whether the Cancel button in the progress
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dialog has been clicked.
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function aegisub.progress.is_cancelled()
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Returns: Boolean. True is the user has clicked the Cancel button, false if it
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has not been clicked, nil if there is no Cancel button.
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---
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Outputting text to the debug log
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function aegisub.debug.out(level, msg, ...)
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@level (number)
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Integer describing the verbosity of this message. Here are some suggested
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values you can use:
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0: Fatal, this is really an error that can't be ignored.
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1: Error, this kind of error can be recovered from, but might result in a
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fatal error later on.
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2: Warning, something might be going wrong.
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3: Hint, something isn't entirely sane, but nothing wrong.
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4: Debug, some additional data only needed for development.
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5: Trace, extremely verbose data showing every tiny step during execution.
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@msg (string)
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A format string used for the message.
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@...
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Parameters for the format string.
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Returns: nothing.
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---
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@ -134,7 +134,7 @@ encoding (number)
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constants.
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relative_to (number)
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???
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From STS.h: "0: window, 1: video, 2: undefined (~window)"
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vertical (boolean)
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Whether vertical text semantics is used or not.
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@ -164,7 +164,7 @@ layer (number)
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start_time (number)
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end_time (number)
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Start/end time of the line in miliseconds.
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Start/end time of the line in milliseconds.
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style (string)
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Name of the style assigned to this line.
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@ -197,11 +197,12 @@ The Subtitle File object is a user data object with some of the metatable
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methods overridden to provide table-like access to the subtitle lines, as
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well as some functions to modify the subtitles.
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The following operations are supported:
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The following operations are supported.
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n = subs[0]
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n = subs.length
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n = #subs
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n = subs.n
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Retrieve the number of lines in total.
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The first syntax is preferred.
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line = subs[i]
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Retrieve line i, assuming 1 <= i <= n.
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@ -222,16 +223,176 @@ subs.deleterange(a, b)
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nothing is done.
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subs[0] = line
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subs.append(line)
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Append a line to the file.
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subs.append(line[, line2, ...])
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Append one or more lines to a file.
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subs[-i] = line
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subs.insert(i, line[, line2, ...])
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Insert a line before index i.
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The function syntax can also insert multiple lines.
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Insert one or more lines before index i.
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(Note that the function-syntax ways of doing these operations is slower than
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the array-syntax way of doing them.)
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Note that the array-style accessors are most likely faster for any case only
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involving one line at a time, while the function syntax versions are probably
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faster if operating on multiple lines at a time.
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---
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Parsing tag data
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This function uses the Aegisub SSA parser to split a string into override
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blocks and text, and give separate access to each tag in override blocks.
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function aegisub.parse_tag_data(text)
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@text (string)
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The SSA format string to parse.
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Returns: A Parsed Tag Data table.
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---
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Recreating a line from tag data
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This function takes a Parsed Tag Data table and creates an SSA string from it.
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function aegisub.unparse_tag_data(tagdata)
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@tagdata (table)
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The Parsed Tag Data table to "unparse".
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Returns: A string, being the "unparsed" data.
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---
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Parsing karaoke data
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Tihs function uses the Aegisub SSA parser to split a string into karaoke
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syllables with additional calculated information added.
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function aegisub.parse_karaoke_data(text)
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@text (string)
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The SSA format string to parse.
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Returns: A Parsed Karaoke Data table.
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---
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Parsed Tag Data table
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The Parsed Tag Data table is an Array Table containing a number of Parsed Line
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Block tables.
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Parsed Line Block table
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A Parsed Line Block describes part of a line. (See ass_dialogue.cpp:70 for a
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more complete description of this.
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There are several classes of Parsed Line Block tables, which have slightly
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varying fields.
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Base Parsed Line Block table class
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class (string)
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One of:
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"plain",
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"override",
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"drawing"
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"plain" and "drawing" Parsed Line Block table classes
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text (string)
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The text contained in this block.
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"override" Parsed Line Block table class
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This class doesn't have any new, specifically named fields. It does, however,
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have multiple integer indexed fields, ie. acts as an Array Table.
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Each of these indexes refer to a table of type Parsed Override Tag.
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Parsed Override Tag table
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This table describes a single override-tag in an SSA line.
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valid (boolean)
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Whether this tag was parsed as a valid tag, or is just used for representing
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junk in the middle of the line.
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name (string)
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Name of the tag, including leading backslash character. (In the case of
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invalid tags, the leading backslash might not be present.)
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paran (boolean)
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Whether this tag has parantheses in its textual representation.
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params (table)
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This is an Array Table containing the parameters for this tag. It will
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always have the maximum number of entries that can be supported by the tag,
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but in case of omitted parameters, the parameters omitted will have 'false'
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for value in this table.
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---
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Parsed Karaoke Data table
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The Parsed Karaoke Data table is simply an Array Table of Karaoke Syllable
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Data tables. However, the Parsed Karaoke Data table will always have one more
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item than its count shows, which is numbered 0 (zero). This item contains
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everything before the first syllable.
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Karaoke Syllable Data table
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This table contains information about a single karaoke syllable.
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duration (number)
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Duration of the syllable in milliseconds.
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(In case of syllable zero, this is always zero.)
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start_time (number)
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end_time (number)
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Start and end times of the syllable, relative to the start of the line,
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given in milliseconds.
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(While these can technically easily be calculated from the duration data,
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they are too convenient to leave out from the standard interface.)
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tag (string)
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The tag used for marking up this syllable. Usually one of:
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"k", "K", "kf", "ko"
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(In case of syllable zero, this is always the empty string.)
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text (string)
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The text of the syllable, including all additional override tags.
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text_stripped (string)
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The text of the syllable, stripped of any override tags.
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---
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Setting undo points
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This function can only be used in macro features, it will have no effect when
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used in any other feature.
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It sets an undo point.
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You should always call this function after every operation that must be
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undoable as a separate step. It is considered very bad practice to modify
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the subtitles in a macro without setting at least one undo-point, which must
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be at the end.
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Furthermore, this function also marks the subtitles as "modified". No other
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function does this.
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function aegisub.set_undo_point(description)
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@description (string)
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A short description of the operation that will be undone, if this undo-point
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is used. Note that this is currently unused in Aegisub, and this parameter
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is simply ignored.
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Returns: nothing.
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---
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