# octext Specification Sheet

Portable Object Compiler (c) 1997,98. All Rights Reserved.

# Text

Inherits from: Object

Maturity Index: Experimental

## Class Description

The Text class associates to a String instance a RunArray. The runs for a string, consist of string segments that have the same text attributes, such as font, boldface, fontsize etc.

## Method types

### Creation

- new
- new:
- str:
- sprintf:
- fromString:
- string:attribute:
- copy
- free

### Comparison

- hash
- isEqual:

### Accessing

- string
- runs
- str
- size
- charAt:
- charAt:put:
- at:insert:
- at:insert:count:
- deleteFrom:to:
- concat:
- concatSTR:

### Emphasis

- allBold
- makeBoldFrom:to:
- addAttribute:
- addAttribute:from:to:
- attributesAt:
- runLengthFor:

### Format Conversions

- asString
- asText
- asParagraph

### Printing

- printOn:

## Methods

### new

> +new

Creates an instance whose value is set to the empty string.

### new:

> +new:(unsigned)nChars

Creates an instance whose value is set to the empty string, can hold at least nChars without having to expand.

### str:

> +str:(STR)aString

Creates an instance whose value is set to a copy of aString. If aString is NULL, creates an instance whose value is set to the empty string.

### sprintf:

> +sprintf:(STR)format,...

Returns a new instace initialized just as the standard C library sprintf(). See the documentation on sprintf() for the formats and variable declarations.

### fromString:

> +fromString:aString

Creates an instance whose value is set to aString.

### string:attribute:

> +string:aString attribute:attrib

Creates an instance whose value is set to aString and then sends itself an addAttribute: message.

### copy

> -copy

Returns a copy of the receiver with its internal C string copied as well.

### free

> -free

Frees the receiver and its internal C string as well.

### hash

> - (unsigned)hash

Returns a hash value based upon the contents of the string held in the receiver.

### isEqual:

> - (BOOL)isEqual:aStr

Returns YES if the string and runarray contained by aStr is equal to the contents of the receiver.

### string

> -string

Returns the String instance for this Text object.

### runs

> -runs

Returns the RunArray instance for this Text object.

### str

> - (STR)str

Returns a pointer to the NULL-terminated C string stored in the receiver.

### size

> - (unsigned)size

Returns the size of the String instance for this Text object. The following all return the same value :

>     [text size];
>     [[text string] size];
>     [[text runs] size];

### charAt:

> - (char)charAt:(unsigned)anOffset

Returns the character at anOffset or zero if anOffset is greater than the length of the C string.

### charAt:put:

> - (char)charAt:(unsigned)anOffset put:(char)aChar

Replaces the character at anOffset with aChar and returns the old character which was in that location. Returns zero if anOffset is greater than the length of the C string.

### at:insert:

> -at:(unsigned)anOffset insert:aString

### at:insert:count:

> -at:(unsigned)anOffset insert:(char*)aString count:(int)size

### deleteFrom:to:

> -deleteFrom:(unsigned)p to:(unsigned)q

### concat:

> -concat:b

### concatSTR:

> -concatSTR:(STR)b

### allBold

> -allBold

This message is equivalent to,

>     [self makeBoldFrom:0 to:[self size] - 1].

Returns self (the text object).

### makeBoldFrom:to:

> -makeBoldFrom:(unsigned)p to:(unsigned)q

Adds a boldface TextAttribute for the characters from index p to q (including the characters at offset p and q). A boldface attribute has emphasiscode equal to 1.

### addAttribute:

> -addAttribute:attribute

This message is equivalent to,

>     [self addAttribute:attribute from:0 to:[self size] - 1].

Returns self (the text object).

### addAttribute:from:to:

> -addAttribute:attribute from:(unsigned)p to:(unsigned)q

Adds attribute to the string segments between p and q.

### attributesAt:

> -attributesAt:(unsigned)i

Returns an OrdCltn of TextAttribute instances for the character at index i.

### runLengthFor:

> - (unsigned)runLengthFor:(unsigned)i

Returns the number of remaining characters in the string segment to which the character at position i belongs. If i is the first character of a run, this method returns the size of the run. Otherwise it returns the size minus the index of character in the run.

### asString

> -asString

Equivalent to string.

### asText

> -asText

Returns the object itself.

### asParagraph

> -asParagraph

Returns a paragraph for this text object.

### printOn:

> -printOn:(IOD)aFile

Prints the Text for the string contained by this instance. Returns the receiver.