tim Rowledge uploaded a new version of Morphic to project The Trunk: http://source.squeak.org/trunk/Morphic-tpr.1348.mcz
==================== Summary ====================
Name: Morphic-tpr.1348 Author: tpr Time: 7 August 2017, 4:40:57.485319 pm UUID: b8af09c4-97da-4835-a036-b1c557a8ab92 Ancestors: Morphic-mt.1347
Explain that an underscore assignment requires a Preference setting
=============== Diff against Morphic-mt.1347 ===============
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: [^ '"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 (deprecated, applies if the Preference for allow underscore assignment is set). The value of the expression after the left arrow is stored into the variable before it."']. - 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!