JPH01158530A - Indent realizing system - Google Patents

Abstract

PURPOSE:To rapidly determine an indent position and to automatically describe a source program, etc., from the rearrangement or an indent position by referring to the parentheses of a preceding line, determining the peak position of the instructed line, inputting successively from the rearrangement or the peak position and displaying the position. CONSTITUTION:When a cursor is placed at a certain line on a picture 2 and the instruction is given to a peak position determining part 1, the peak position of the instructed line is determined corresponding to the depth level while the parentheses of the preceding line is referred to. The character and symbol are rearranged from the determined peak position and the displayed or inputted character and symbol are successively arranged and displayed. Thus, when the indent is instructed, the parentheses of the preceding line is referred to, the peak position is rapidly determined, the input and displaying can be successively executed from the rearrangement or the peak position and the peak position of the next line can be rapidly determined.

Description

[Detailed Description of the Invention] [Summary] Regarding an indentation realization method for indenting characters and symbols displayed on the screen, the present invention aims to quickly determine the starting position of the next line by referring to the parentheses of the previous line. , is equipped with a start position determination unit that pays attention to the parentheses and determines the start position of the specified line based on the parentheses written in the previous line, and starts from the start position determined by this start position determination unit. Configure columns to input or arrange.

(Industrial Application Field) The present invention relates to an indent realization method for indenting characters and symbols displayed on a screen.

[Problems to be solved by the prior art and the invention] A source program for a list processing programming language (such as LISP) consists of a large number of parentheses, and in order to edit it into an easy-to-read program. It is desirable to write with a meaningful indentation.

The list is constructed by a -pair of right parentheses "(" and left parentheses ")". These parentheses mean that if "ji" appears again before the ")" that corresponds to the ")" that appears from the beginning of the ``2'' appears, the list becomes structurally one step deeper (lower level), while the corresponding ``)'' appears. When ′ appears, it means returning to the original depth. Paying attention to this,
To make it easier to read in the source program, you can indent it according to the depth of the list structure. In other words, when 2 extends over several lines, it is desirable that lists of the same depth be displayed indented at the same position.

□ However, in the past, in order to display (describe) from a position corresponding to this depth, all parentheses were searched from the beginning of the expression to find the corresponding parentheses, and the indentation was determined. The problem was that it could not be determined.

An object of the present invention is to quickly determine the starting position of the next line by referring to the parentheses of the previous line.

[Means for solving problems]

Means for solving the problem will be explained with reference to FIG.

In FIG. 1, the head position determination unit 1 pays attention to the parentheses and determines the head position of the designated line by referring to the parentheses of the previous line.

The screen (screen buffer) 2 displays (stores) a source program written using a list processing program language.

[Effect]

As shown in the figure, when the cursor is placed on a certain line on the screen 2 and an instruction is given to the start position determination unit 1, the start position of the specified line is determined by referring to the parentheses of the previous line. This is determined in accordance with the depth level, and the characters and symbols are rearranged and displayed from the determined top position, or the input characters and symbols are sequentially arranged and displayed.

Therefore, when indentation is instructed, it is possible to quickly determine the starting position by referring to the parentheses in the previous line, and then rearrange the data or input and display sequentially from the starting position.

〔Example〕

Next, the configuration and operation of one embodiment of the present invention will be explained in detail using FIGS. 1 and 2.

In FIG. 1, a memory 3 stores a source program written on the screen 2 in an indented manner in correspondence with the depth level of the parentheses and start position information. In the figure “
l'' represents a line feed symbol. In the figure, tab' is a control symbol that moves the start position of the source program to the position determined by the start position determination unit l, and also a predetermined number of spaces, for example, 5 in this case. This indicates that the leading position is moved by the blank bone in . Two tab' corresponds to 10 blanks. Fractional blanks are represented using `` in the figure.

First, we will focus on parentheses and explain the rules for determining the starting position of a designated line by referring to the parentheses in the previous line.

Rule 1: If the first parenthesis that appears after the previous line of the specified line is ", then move the position one level lower than that position (tab one sentence lower) to the specified line. Determine the indent position.

Rule 2: If the first parenthesis that appears after the previous line of the specified line is ")", and if "(" corresponding to this ")" is found, the same position of the found " Determine the indentation position of the specified line.

Rule 3: When the first parenthesis that appears after the previous line of the specified line is ")", and the corresponding "(')" is not found, then this missing ")" is found. Find the total number N, and find the last one in the previous line.
(The position at a level shallower than the position of 2 by this total number of bones is determined to be the indentation position of the specified line.

Next, the source program is written starting from, for example, the left end position of each line, and the procedure for determining and moving the starting position according to the level depth as shown in screen 2 will be described in detail.

After moving the cursor to any position on the second line,
When an instruction is given by pressing the "tab" key, the start position determination unit l searches from after the first line, which is the previous line, and first selects the position shown in the figure.
Since we found ")" at the position of , and found the corresponding " at the position of Determine the location.

After moving the cursor to any position on the third line,
tab” key, the head position determination unit 1 searches from after the second line, which is the previous line, and first locates O in the figure.
Since we found ")" at the position of , and found the corresponding 1 at the position of ■ in the figure, it matches Rule 2 mentioned above,
The position of this O is determined to be the indentation position of the designated third line.

After moving the cursor to any position on the 4th line,
When an instruction is given by pressing the "tab" key, the head position determining unit 1 searches from after the third line, which is the previous line, and first selects [ in the figure.
Since we found "
is determined to be the indentation position of the specified fourth line.

After moving the cursor to any position on the 5th line,
When an instruction is given by pressing the "tab" key, the start position determining unit 1 searches from after the fourth line, which is the previous line, and first selects [ in the figure.
F], but the corresponding ")" is not found in this line, so it matches Rule 3 mentioned above, and the total number N of missing ")2" is calculated in the figure. Middle■
As shown in , the indentation position is calculated as "2", and the position ■ that is two steps higher than the indentation position ■ of the fourth line is the specified fifth line.
Determine the line indentation position.

Through the above procedure, indent positions are determined and displayed one after another as described on screen 2.

In the above explanation, all the source programs have been written and only the indentation position will be determined later, but the indentation position may be determined while sequentially writing the source programs. Specifically speaking,
After writing the source program shown on the first line, if you enter a new line on the second line and press the TAB key, the source program you entered will be automatically displayed from the indented position of position ■. It is something that

Next, when the source program and indentation information displayed on the screen 2 are stored in the memory 3, it becomes as shown in the figure.

Briefly, in the memory 3, source programs written in the first to fifth lines of the screen 2 are sequentially stored serially.

At this time, a line feed symbol is inserted at the end of each line, and
At least one start position control symbol "tab" according to the present invention is inserted at the beginning of each line (excluding the first line).As described above, this start position control symbol "tab"
causing the head position determination unit l to determine the head position;
It also includes information on how many spaces are inserted for the determined start position (in this case, one tab" inserts five spaces). The number of spaces that should be inserted for one tab". If the number of blank spaces is a fraction, insert two tabs, or use a blank symbol " if the number of spaces is a fraction.
Next, using FIG. 2, we will briefly explain the operation when writing a source program in a list processing programming language (such as LISP).

In Fig. 2, the symbol ■ in the diagram indicates that the end of the line has been written. Represents what has been written.

O in the figure indicates pressing the line feed key. This is in the diagram ◎
The end of the line is written with , and the line feed key is pressed to start a new line. This moves the cursor to the beginning of the next line.

◎ in the figure indicates pressing the tab key, which is 0 in the figure.
The cursor moved to the beginning of the next line in response to pressing the line feed key moves to a position corresponding to any of the rules 1 to 4 described, for example, in the case of the second line on the first drawing 2. means that the cursor moves to the position indicated by position ■. In this way, by pressing the line feed key or the tab key, the cursor is automatically moved to the writing start position on the next line, and the source program can be written from this cursor position as indicated by ■ in the figure. It becomes possible.

In the figure, ■ indicates that it is determined whether or not it is the end.

If YES (end), the process ends.

In the case of No, steps from ■ to [phase] in the figure are repeatedly executed.

Although Fig. 2 describes the case where the source program, etc. is written sequentially from the position of the cursor that is automatically moved by pressing the line feed key and the tab key in sequence, this is not a limitation. On the other hand, even if you move the cursor to a certain line and press the tab key,
As explained in section 3 in the figure, the starting position of the parentheses in the current line is set by looking at the state of the parentheses in the previous line.

〔Effect of the invention〕

As explained above, according to the present invention, when indentation is specified, the starting position of the instructed line is determined by referring to the parentheses of the previous line, and the arrangement is rearranged or input sequentially from the starting position. Since it is configured to display the indentation position, it is possible to quickly determine the indentation position and rearrange it, or to automatically write the source program from the indentation position.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of one embodiment of the present invention, and FIG. 2 is a flowchart for explaining the operation of the present invention. In the figure, 1 represents a head position determination unit, 2 represents a screen (screen buffer) for displaying a source program, and 3 represents a memory.

Claims (1)

[Claims] In an indent realization method for indenting characters and symbols displayed on a screen, the parentheses are noted and the starting position of the designated line is determined based on the parentheses written in the previous line. The head position determination unit (1
), and a character/symbol string is input or arranged from the start position determined by the start position determination unit (1).