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MODES
33
MODES
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@ -3,11 +3,10 @@ modes work, how you might create one yourself, etc.
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1. What are modes?
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1. What are modes?
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Pmacs uses modes to determine what actions can be applied to a buffer, which
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Pmacs uses modes to determine what which keys should apply which actions, how
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keys should apply which actions, how the buffer should be highlighted, how the
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the buffer should be highlighted, how the buffer should be indented, and any
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buffer should be indented, and any other per-buffer configuration. The default
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other per-buffer configuration. The default mode ("Fundamental") provides the
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mode ("Fundamental") provides the base functionality which all other modes
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base functionality which all other modes inherit.
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inherit.
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2. Where do they come from?
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2. Where do they come from?
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@ -27,8 +26,8 @@ The one thing every mode has in common is that they map key bindings to actions
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to be taken. They do this via self.bindings, a dictionary mapping action names
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to be taken. They do this via self.bindings, a dictionary mapping action names
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(i.e. 'page-down') to a tuple of key bindings (i.e. ('C-v', 'PG_DN',)).
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(i.e. 'page-down') to a tuple of key bindings (i.e. ('C-v', 'PG_DN',)).
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Modes subclass mode2.Fundamental, and they call mode2.Fundamental.__init__ to
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Modes subclass mode.Fundamental, and they call mode.Fundamental.__init__ to run
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run the standard mode initialization (including building the default bindings
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the standard mode initialization (including building the default bindings
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dictionary); they can later modify or overwrite this dictionary if they choose.
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dictionary); they can later modify or overwrite this dictionary if they choose.
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There are at least 3 optional behaviors modes can make use of:
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There are at least 3 optional behaviors modes can make use of:
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@ -46,11 +45,17 @@ documents.
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Syntax highlighting uses a hybrid lexing/parsing process to break each line of
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Syntax highlighting uses a hybrid lexing/parsing process to break each line of
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the buffer down into one or more lexical tokens; these tokens are primarily
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the buffer down into one or more lexical tokens; these tokens are primarily
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used to highlight parts of the buffer different colors. The colors to use are
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used to highlight parts of the buffer different colors. The colors to use are
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defined by self.colors, a dictionary mapping token-names to a tuple consisting
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defined by application.colors, a dictionary mapping token-names to a tuple
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of at least a foreground color and a background color.
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consisting of at least a foreground color and a background color. Modes can
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define a self.colors dictionary which will be added to the application; however,
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modes are not permitted to override the global defaults in this way (the user
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can override them via ~/.pmc/conf in whatever way is desired).
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Modes are encouraged to use "generic" token names when appropriate; modes can
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also "namespace" their tokens to allow for mode-specific customization.
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Explaining how to write a Grammar is outside the scope of this document; see
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Explaining how to write a Grammar is outside the scope of this document; see
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lex3.py, mode2.py and mode/*.py for examples. Some important points to note:
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lex.py, mode.py and mode/*.py for examples. Some important points to note:
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* Regexes are applied to only one line of the document at a time.
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* Regexes are applied to only one line of the document at a time.
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* All regexes must match at least one character (the newline counts).
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* All regexes must match at least one character (the newline counts).
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@ -62,6 +67,8 @@ lex3.py, mode2.py and mode/*.py for examples. Some important points to note:
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* Regions of text which begin and end with recognizable tokens can be
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* Regions of text which begin and end with recognizable tokens can be
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lexed using a different sub-grammar using RegionRule, etc. This nesting
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lexed using a different sub-grammar using RegionRule, etc. This nesting
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can be arbitrarily deep.
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can be arbitrarily deep.
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* sub-grammars can be dynamically specified in modes that provide one or
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more OverridePatternRule objects.
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5. Indentation level detection
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5. Indentation level detection
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@ -78,9 +85,9 @@ in the mode. At a minimum, a tabber must support the following methods:
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* region_added(self, p, lines)
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* region_added(self, p, lines)
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* region_removed(self, p1, p2)
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* region_removed(self, p1, p2)
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Tabber classes can often be tricky to implement correctly. tab2.Tabber provides
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Tabber classes can often be tricky to implement correctly. tab.Tabber provides
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a lot of base functionality that is probably useful; also, you may want to try
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a lot of base functionality that is probably useful; also, you may want to try
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looking at tab2.StackTabber, which provides even more base support.
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looking at tab.StackTabber, which provides even more base support.
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6. Tag matching
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6. Tag matching
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@ -98,7 +105,7 @@ cases, here is how it works:
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* closetokens: tuple of lexical tokens which can be closetags
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* closetokens: tuple of lexical tokens which can be closetags
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* closetags: dictionary mapping closetag strings to opentag strings
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* closetags: dictionary mapping closetag strings to opentag strings
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b. Also in the visecmode, create or instantiate actions who subclass
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b. Also in the mode, create or instantiate actions who subclass
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method.CloseTag (e.g. method.CloseParen) and assign them the appropriate
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method.CloseTag (e.g. method.CloseParen) and assign them the appropriate
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binding (e.g. '(').
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binding (e.g. '(').
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11
README
11
README
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@ -17,7 +17,7 @@ others. The code is somewhat commented, although currently there is only one
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author. Buyer beware!
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author. Buyer beware!
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Requirements:
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Requirements:
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1. python 2.3 or higher
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1. python 2.4 or higher
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2. ncurses
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2. ncurses
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3. bash
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3. bash
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@ -72,9 +72,10 @@ Quick Start Guide:
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C-x C-f open file in a new buffer
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C-x C-f open file in a new buffer
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C-x k close the current buffer
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C-x k close the current buffer
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C-c M-h open a buffer listing all available commands/bindings
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C-c M-h open a buffer listing all available key bindings
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M-h get a help with a command by name
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C-c M-? open a buffer listing all available functions
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M-? get information about a key sequence
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M-? get a help with a command by name
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M-h get information about a key sequence
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C-x C-s save your changes
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C-x C-s save your changes
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C-x C-c quit
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C-x C-c quit
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@ -92,4 +93,4 @@ Quick Start Guide:
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b. comments in the source code
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b. comments in the source code
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Good luck!
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Good luck!
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