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modifying the compiler adding an alias for :=

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Erik Itter

modifying the compiler adding an alias for :=

Hi,

I need to modify the compiler adding ":>" as an alias for ":=" for
assignment. I have been reading all over the Compiler package but do not
find where a tokenizer parses for the assignement operator or where it
is defined.

Any hint where to start or do it is appreciated.

best regards
Erik

Thierry Goubier

Re: modifying the compiler adding an alias for :=

Hi,

If you are using the OpalCompiler (Pharo4, sure, Pharo3, I'm not so sure), have a look at:

RBScanner>>scanSpecialCharacter

Thierry

2014-12-10 12:57 GMT+01:00 Erik Itter <[hidden email]>:

Hi,

I need to modify the compiler adding ":>" as an alias for ":=" for assignment. I have been reading all over the Compiler package but do not find where a tokenizer parses for the assignement operator or where it is defined.

Any hint where to start or do it is appreciated.

best regards
Erik

Erik Itter

Re: modifying the compiler adding an alias for :=

Thanks, tried

scanSpecialCharacter
    | character |
    currentCharacter = $:
        ifTrue: [
            self step.
            ^ currentCharacter = $=
                ifTrue: [
                    self step.
                    RBAssignmentToken start: tokenStart]
                ifFalse: [ RBSpecialCharacterToken value: $: start: tokenStart ]].

    currentCharacter = $:
        ifTrue: [
            self step.
            ^ currentCharacter = $>
                ifTrue: [
                    self step.
                    RBAssignmentToken start: tokenStart]
                ifFalse: [ RBSpecialCharacterToken value: $: start: tokenStart ]].

    currentCharacter = $_ ifTrue: [
        self step.
        ^ RBShortAssignmentToken start: tokenStart ].

    character := currentCharacter.
    self step.
    ^ RBSpecialCharacterToken value: character start: tokenStart

but while it does not seem to shred my image to pieces it also seems to have no effect at all. I guess the UI components still check differently and neither workplace nor SystemBrowser allow me to write code using the :> operator

Am 10.12.2014 um 13:11 schrieb Thierry Goubier:

Hi,

If you are using the OpalCompiler (Pharo4, sure, Pharo3, I'm not so sure), have a look at:

RBScanner>>scanSpecialCharacter

Thierry

2014-12-10 12:57 GMT+01:00 Erik Itter <[hidden email]>:

Hi,

I need to modify the compiler adding ":>" as an alias for ":=" for assignment. I have been reading all over the Compiler package but do not find where a tokenizer parses for the assignement operator or where it is defined.

Any hint where to start or do it is appreciated.

best regards
Erik

Thierry Goubier

Re: modifying the compiler adding an alias for :=

Hi Erik,

You need to make sure you are using the right compiler. In a Pharo3 image, you'll find two compilers: Opal and the old one.

In the old one, you need to change:

Scanner>>xColon

In RB/Opal, what you can try with your changes is to inspect:

RBParser parseExpression: 'a :> 5'

And, if you get a RBAssignmentNode, then it is working.

Thierry

2014-12-10 13:32 GMT+01:00 Erik Itter <[hidden email]>:

Thanks, tried

scanSpecialCharacter
    | character |
    currentCharacter = $:
        ifTrue: [
            self step.
            ^ currentCharacter = $=
                ifTrue: [
                    self step.
                    RBAssignmentToken start: tokenStart]
                ifFalse: [ RBSpecialCharacterToken value: $: start: tokenStart ]].

    currentCharacter = $:
        ifTrue: [
            self step.
            ^ currentCharacter = $>
                ifTrue: [
                    self step.
                    RBAssignmentToken start: tokenStart]
                ifFalse: [ RBSpecialCharacterToken value: $: start: tokenStart ]].

    currentCharacter = $_ ifTrue: [
        self step.
        ^ RBShortAssignmentToken start: tokenStart ].

    character := currentCharacter.
    self step.
    ^ RBSpecialCharacterToken value: character start: tokenStart

but while it does not seem to shred my image to pieces it also seems to have no effect at all. I guess the UI components still check differently and neither workplace nor SystemBrowser allow me to write code using the :> operator

Am 10.12.2014 um 13:11 schrieb Thierry Goubier:

Hi,

If you are using the OpalCompiler (Pharo4, sure, Pharo3, I'm not so sure), have a look at:

RBScanner>>scanSpecialCharacter

Thierry

2014-12-10 12:57 GMT+01:00 Erik Itter <[hidden email]>:

Hi,

I need to modify the compiler adding ":>" as an alias for ":=" for assignment. I have been reading all over the Compiler package but do not find where a tokenizer parses for the assignement operator or where it is defined.

Any hint where to start or do it is appreciated.

best regards
Erik

Nicolai Hess

Re: modifying the compiler adding an alias for :=

In reply to this post by Erik Itter

2014-12-10 13:32 GMT+01:00 Erik Itter <[hidden email]>:

Thanks, tried

scanSpecialCharacter
    | character |
    currentCharacter = $:
        ifTrue: [
            self step.
            ^ currentCharacter = $=
                ifTrue: [
                    self step.
                    RBAssignmentToken start: tokenStart]
                ifFalse: [ RBSpecialCharacterToken value: $: start: tokenStart ]].

    currentCharacter = $:
        ifTrue: [
            self step.
            ^ currentCharacter = $>
                ifTrue: [
                    self step.
                    RBAssignmentToken start: tokenStart]
                ifFalse: [ RBSpecialCharacterToken value: $: start: tokenStart ]].

    currentCharacter = $_ ifTrue: [
        self step.
        ^ RBShortAssignmentToken start: tokenStart ].

    character := currentCharacter.
    self step.
    ^ RBSpecialCharacterToken value: character start: tokenStart

but while it does not seem to shred my image to pieces it also seems to have no effect at all. I guess the UI components still check differently and neither workplace nor SystemBrowser allow me to write code using the :> operator

Am 10.12.2014 um 13:11 schrieb Thierry Goubier:

Hi,

If you are using the OpalCompiler (Pharo4, sure, Pharo3, I'm not so sure), have a look at:

RBScanner>>scanSpecialCharacter

Thierry

2014-12-10 12:57 GMT+01:00 Erik Itter <[hidden email]>:

Hi,

I need to modify the compiler adding ":>" as an alias for ":=" for assignment. I have been reading all over the Compiler package but do not find where a tokenizer parses for the assignement operator or where it is defined.

Any hint where to start or do it is appreciated.

best regards
Erik

Hi Erik

with Opal resp. RBScanner (in pharo3 and pharo4)

There is a special handling for

k:=1

and

k := 1

because "k" can be an identifier, or the start of a selector (keyword message) therefore you
have to change this too:

RBScanner>>#scanIdentifierOrKeyword

(currentCharacter = $: and: [stream peek ~= $=]) "<---- add a test for $>"
ifTrue: [^self scanKeyword].

and the browsers/editor source code panel uses SHParserST80 for the syntax highlighting:

SHParserST80>>#isAssignment
^ currentToken = ':='
or: [currentToken = '_'] "<---- add atest for $> "

nicolai

Erik Itter

Re: modifying the compiler adding an alias for :=

THX, Nicolai and Thierry, that got me a few steps further and will try
to get the rest by myself (at least for a few hours...).

andreas

Re: modifying the compiler adding an alias for :=

Hi,

and did you find your answer?