5083108441

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push

github

Committed by Hernán Morales Durand

Commit Message

Add methods to draw a scatter plot matrix of a DataFrame

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/src/DataFrame-IO/DataFrameTextWriter.class.st

"
Implements a Text writer for DataFrame contents, including setting the alignment of each cell to the left and right.

# Example

```language=Pharo
(DataFrameCsvReader new
        readFromString: 'Given$a$text$file$of$many$lines,$where$fields$within$a$line$
are$delineated$by$a$single$''dollar''$character,$write$a$program
that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$
column$are$separated$by$at$least$one$space.
Further,$allow$for$each$word$in$a$column$to$be$either$left$
justified,$right$justified,$or$center$justified$within$its$column.'
        withSeparator: $$
        withHeader: false)
                writeToTextAlignedRight
```
"
Class {
        #name : #DataFrameTextWriter,
        #superclass : #DataFrameCsvWriter,
        #instVars : [
                'padDirection'
        ],
        #category : #'DataFrame-IO-Core'
}

{ #category : #accessing }
DataFrameTextWriter >> padDirection [

        ^ padDirection
]

{ #category : #accessing }
DataFrameTextWriter >> padDirection: anObject [

        padDirection := anObject
]

{ #category : #accessing }
DataFrameTextWriter >> padLeft [
        "Set the receiver to pad elements to left"

        self padDirection: #padLeftTo:
]

{ #category : #accessing }
DataFrameTextWriter >> padRight [
        "Set the receiver to pad elements to left"

        self padDirection: #padRightTo:
]

{ #category : #writing }
DataFrameTextWriter >> rowPairsFor: colWidths using: row [

        | gen |

        gen := Generator on: [ : g | colWidths do: [ : k | g yield: k ] ].
        ^ row collect: [ : w | { w . gen next } ]
]

{ #category : #writing }
DataFrameTextWriter >> write: aDataFrame [
        "Answer a <String> representation of aDataFrame, aligned according to the receiver's padDirection"

        ^ String streamContents: [ : stream |
                | colWidths |
                colWidths := aDataFrame applySize applyToAllColumns: #max.
                (aDataFrame collect: [ : row | self rowPairsFor: colWidths using: row ])
                        do: [ : line |
                                self writeLine: line to: stream.
                                stream cr ] ]
]

{ #category : #writing }
DataFrameTextWriter >> writeLine: line to: stream [

        line do: [ : pair |
                pair first ifNotNil: [ : pf |
                        stream
                                << (pf perform: self padDirection with: pair second);
                                space ] ]
]

1	"
2	Implements a Text writer for DataFrame contents, including setting the alignment of each cell to the left and right.
3
4	# Example
5
6	```language=Pharo
7	(DataFrameCsvReader new
8	readFromString: 'Given$a$text$file$of$many$lines,$where$fields$within$a$line$
9	are$delineated$by$a$single$''dollar''$character,$write$a$program
10	that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$
11	column$are$separated$by$at$least$one$space.
12	Further,$allow$for$each$word$in$a$column$to$be$either$left$
13	justified,$right$justified,$or$center$justified$within$its$column.'
14	withSeparator: $$
15	withHeader: false)
16	writeToTextAlignedRight
17	```
18	"
19	Class {
20	#name : #DataFrameTextWriter,
21	#superclass : #DataFrameCsvWriter,
22	#instVars : [
23	'padDirection'
24	],
25	#category : #'DataFrame-IO-Core'
26	}
27
28	{ #category : #accessing }
29	DataFrameTextWriter >> padDirection [	×
30		×
31	^ padDirection	×
32	]	×
33
34	{ #category : #accessing }
35	DataFrameTextWriter >> padDirection: anObject [	×
36		×
37	padDirection := anObject	×
38	]	×
39
40	{ #category : #accessing }
41	DataFrameTextWriter >> padLeft [	×
42	"Set the receiver to pad elements to left"	×
43		×
44	self padDirection: #padLeftTo:	×
45	]	×
46
47	{ #category : #accessing }
48	DataFrameTextWriter >> padRight [	×
49	"Set the receiver to pad elements to left"	×
50		×
51	self padDirection: #padRightTo:	×
52	]	×
53
54	{ #category : #writing }
55	DataFrameTextWriter >> rowPairsFor: colWidths using: row [	×
56		×
57	\| gen \|	×
58		×
59	gen := Generator on: [ : g \| colWidths do: [ : k \| g yield: k ] ].	×
60	^ row collect: [ : w \| { w . gen next } ]	×
61	]	×
62
63	{ #category : #writing }
64	DataFrameTextWriter >> write: aDataFrame [	×
65	"Answer a <String> representation of aDataFrame, aligned according to the receiver's padDirection"	×
66		×
67	^ String streamContents: [ : stream \|	×
68	\| colWidths \|	×
69	colWidths := aDataFrame applySize applyToAllColumns: #max.	×
70	(aDataFrame collect: [ : row \| self rowPairsFor: colWidths using: row ])	×
71	do: [ : line \|	×
72	self writeLine: line to: stream.	×
73	stream cr ] ]	×
74	]	×
75
76	{ #category : #writing }
77	DataFrameTextWriter >> writeLine: line to: stream [	×
78		×
79	line do: [ : pair \|	×
80	pair first ifNotNil: [ : pf \|	×
81	stream	×
82	<< (pf perform: self padDirection with: pair second);	×
83	space ] ]	×
84	]	×

PolyMathOrg / DataFrame / 5083108441

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