Insertion of character set change codes in an altered text stream

In a text processing system where a text stream is stored and different characters sets are selectable for insertion within the text stream, a method for altering the text stream comprising the steps of:

• displaying said text stream to an operator;
• in response to an operator command, identifying a location in said text stream for inserting a block of selected text;
• determining the character set for the preceding text in said text stream immediately before the identified location and for the following text in said text stream immediately after the identified location;
• determining the character set for the starting text and ending text of the block of selected text to be inserted;
• comparing the character set for the preceding text with the starting text for a character set mismatch;
• inserting a character set change code in said text stream between said prededing text and said starting text when the comparison indicates a character set mismatch between the character set for said starting text and said preceding text;
• inserting said block of selected text at said location;
• comparing the character set for the following text with the ending text for a character set mismatch;
• and
• inserting a character set change code in said text stream between said ending text and said following text when the comparison indicates a character set mismatch between the character set for said following text and said ending text.

In a text processing system where a text stream is stored and different character sets are selectable for deletion from the text stream, a method for altering said text stream, comprising the steps of:

• displaying said text stream to an operator;
• in response to an operator command, identifying a block of text stream for deletion from said text stream;
• determining the character set for the preceding text immediately before the block of text stream and for the following text immediately after the block of text stream;
• deleting the block of text stream;
• comparing the character set of the text preceding the deleted block of text with the character set following the block of text for a character set mismatch;
• and
• inserting a character set change code after said preceding text and before said following text when the two texts do not compare to indicate the character set of said following text differs from the character set for said preceding text.

In a text procesing system having a stored text stream where different character sets are selectable for insertion or deletion within the text stream, a method for altering said text stream, comprising the steps of:

• identifying a block of text to be inserted into the text stream at an operator selected location;
• determining the character set for the preceding text in the text stream immediately before the operator selected location;
• determining the character set for the starting text of the block of inserted text;
• comparing the text preceding the point of insertion in the text stream and the starting text of the block of inserted text;
• inserting a character set change code in said text stream between said preceding text and the starting text when the comparison indicates a character set mismatch between the character set for the starting text and said preceding text;
• and
• inserting said block of said selected text at the operator selected location.

In a text processing system having a stored text stream where different character sets are selectable for deletion from the text stream, a method for altering the text stream, comprising the steps of:

• determining the character set for the preceding text immediately before a block of text stream to be deleted and also the character set for the following text immediately after the block of text stream;
• deleting the block of text stream;
• comparing the character set for the preceding text with the character set for the following text to identify a character set mismatch;
• and
• inserting a character set change code after said preceding text and before said following text when the two texts do not compare to indicate the character set of said following text differs from the character set for the preceding text.