[squeak-dev] The Trunk: Morphic-eem.1332.mcz
commits at source.squeak.org
commits at source.squeak.org
Fri Mar 31 00:16:51 UTC 2017
Eliot Miranda uploaded a new version of Morphic to project The Trunk:
http://source.squeak.org/trunk/Morphic-eem.1332.mcz
==================== Summary ====================
Name: Morphic-eem.1332
Author: eem
Time: 30 March 2017, 5:16:31.544874 pm
UUID: b9f51007-d896-4a7e-9390-1fa7bf41cb56
Ancestors: Morphic-bf.1331
Replace mention of BlockContext with BlockClosure in teh Morphic explainer code.
=============== Diff against Morphic-bf.1331 ===============
Item was changed:
----- Method: TextEditor>>explainChar: (in category 'explain') -----
explainChar: string
"Does string start with a special character?"
| char |
char := string at: 1.
char = $. ifTrue: [^'"Period marks the end of a Smalltalk statement. A period in the middle of a number means a decimal point. (The number is an instance of class Float)."'].
char = $' ifTrue: [^'"The characters between two single quotes are made into an instance of class String"'].
char = $" ifTrue: [^'"Double quotes enclose a comment. Smalltalk ignores everything between double quotes."'].
char = $# ifTrue: [^'"The characters following a hash mark are made into an instance of class Symbol. If parenthesis follow a hash mark, an instance of class Array is made. It contains literal constants."'].
(char = $( or: [char = $)]) ifTrue: [^'"Expressions enclosed in parenthesis are evaluated first"'].
+ (char = $[ or: [char = $]]) ifTrue: [^'"The code inside square brackets is an unevaluated block of code. It becomes an instance of BlockClosure and is usually passed as an argument."'].
- (char = $[ or: [char = $]]) ifTrue: [^'"The code inside square brackets is an unevaluated block of code. It becomes an instance of BlockContext and is usually passed as an argument."'].
(char = ${ or: [char = $}]) ifTrue: [^ '"A sequence of expressions separated by periods, when enclosed in curly braces, are evaluated to yield the elements of a new Array"'].
(char = $< or: [char = $>]) ifTrue: [^'"<primitive: xx> means that this method is usually preformed directly by the virtual machine. If this method is primitive, its Smalltalk code is executed only when the primitive fails."'].
char = $^ ifTrue: [^'"Uparrow means return from this method. The value returned is the expression following the ^"'].
char = $| ifTrue: [^'"Vertical bars enclose the names of the temporary variables used in this method. In a block, the vertical bar separates the argument names from the rest of the code."'].
char = $_ ifTrue: [^'"Left arrow means assignment. The value of the expression after the left arrow is stored into the variable before it."'].
char = $; ifTrue: [^'"Semicolon means cascading. The message after the semicolon is sent to the same object which received the message before the semicolon."'].
char = $: ifTrue: [^'"A colon at the end of a keyword means that an argument is expected to follow. Methods which take more than one argument have selectors with more than one keyword. (One keyword, ending with a colon, appears before each argument).', '\\' withCRs, 'A colon before a variable name just inside a block means that the block takes an agrument. (When the block is evaluated, the argument will be assigned to the variable whose name appears after the colon)."'].
char = $$ ifTrue: [^'"The single character following a dollar sign is made into an instance of class Character"'].
char = $- ifTrue: [^'"A minus sign in front of a number means a negative number."'].
char = $e ifTrue: [^'"An e in the middle of a number means that the exponent follows."'].
char = $r ifTrue: [^'"An r in the middle of a bunch of digits is an instance of Integer expressed in a certain radix. The digits before the r denote the base and the digits after it express a number in that base."'].
char = Character space ifTrue: [^'"the space Character"'].
char = Character tab ifTrue: [^'"the tab Character"'].
char = Character cr ifTrue: [^'"the carriage return Character"'].
char = Character lf ifTrue: [^'"the line feed Character"'].
^nil!
Item was changed:
----- Method: TextEditor>>explainCtxt: (in category 'explain') -----
explainCtxt: symbol
"Is symbol a context variable?"
| reply classes text cls |
symbol = #nil ifTrue: [reply := '"is a constant. It is the only instance of class UndefinedObject. nil is the initial value of all variables."'].
symbol = #true ifTrue: [reply := '"is a constant. It is the only instance of class True and is the receiver of many control messages."'].
symbol = #false ifTrue: [reply := '"is a constant. It is the only instance of class False and is the receiver of many control messages."'].
+ symbol = #thisContext ifTrue: [reply := '"is a context variable. Its value is always the Context which is executing this method."'].
- symbol = #thisContext ifTrue: [reply := '"is a context variable. Its value is always the MethodContext which is executing this method."'].
(model respondsTo: #selectedClassOrMetaClass) ifTrue: [
cls := model selectedClassOrMetaClass].
cls ifNil: [^ reply]. "no class known"
symbol = #self ifTrue:
[classes := cls withAllSubclasses.
classes size > 12
ifTrue: [text := cls printString , ' or a subclass']
ifFalse:
[classes := classes printString.
text := 'one of these classes' , (classes copyFrom: 4 to: classes size)].
reply := '"is the receiver of this message; an instance of ' , text , '"'].
symbol = #super ifTrue: [reply := '"is just like self. Messages to super are looked up in the superclass (' , cls superclass printString , ')"'].
^reply!
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