JPH01106235A - Display system for error position in source program - Google Patents

Abstract

PURPOSE:To efficiently execute processing by forming a table consisting of an internal text from which spaces are removed the position of a character string in the internal text and the number of spaces up to the character string and detecting the position of an error-detected character in a source program on the basis of the internal text and the table. CONSTITUTION:The source program is scanned by an internal text/table forming means 1, only character strings are successively transferred to the internal text 5 and the positions of the character strings in the internal text 5 and the number of spaces meaningless in syntax generated up to the character strings are obtained and stored in the table 6. Then, a digit position in the internal text 5 about a character detected at its error in the translating process of the resource program in the internal text 5 is found out by an intra-source program error position detecting means 2 and the number of spaces obtained from the table 6 is added to the digit position. Then, an intra-source program error position is displayed on a source program list by an intra-source program error position displaying means 3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for displaying, on a source program image list, the location of grammatical errors etc. detected in a source program manually input by a compiler.

(Prior art) Conventionally, when displaying the location of an error detected during compilation on a source program image list, the internal text that still contains unnecessary syntactically meaningless whitespace is translated during the translation process. However, I used it to get the erroneous digit position and display it at the corresponding position.

[Problem that the invention seeks to solve]

In general, syntactically meaningless whitespace is often written by the user in the source program for the purpose of making it easier to read the source program list output by the compiler. In the conventional method of using the original internal text, the translation process would include unnecessary spaces, and it was necessary to skip syntactically meaningless spaces in the internal text during the translation process. .

[Means for solving problems]

Error position display method in a source program of the present invention Scans the source program and sequentially moves only syntactically meaningful strings to the internal text area of the storage area, and also internal text area of the strings transferred to the internal text area an internal text table creation means that obtains the position within the string and the number of syntactically meaningless spaces that have appeared up to that character string, and stores these as a set in a table; After the text and table are created, find the column position in the internal text of the character detected as an error during the process of translating the source program of the internal text, and if the same position exists, obtain the corresponding number of spaces from the table. , if there is no same digit position, the number of blanks corresponding to the largest digit position smaller than the digit position is obtained from the duple, and the error position detection means in the source program is added to the digit position. and source program error position display means for displaying the source program error position detected by the source program error position detection means on the source program list.

[For production]

Processing is efficient because the internal text is used without syntactically meaningless whitespace.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of a method for displaying error positions in a source program according to the present invention.

This embodiment scans the source program 4 and sequentially transfers only character strings that have a syntactical meaning to the internal text 5 area of the storage area, and the internal text of the character strings transferred to the internal text 5 area an internal text table creation means 1 that obtains the position within the text 5 area and the number of syntactically meaningless spaces that have appeared up to that character string, and stores these as a set in a table 6;・Table creation means 1
After the internal text 5 and table 6 are created, find the digit position on the internal text 5 of the character in which an error was detected in the process of translating the source program of the internal text 5,
If the same position exists, the number of corresponding blanks is obtained from Table 6, and if there is no same digit position, the number of blanks corresponding to the largest digit position that is smaller than the corresponding digit position is obtained from Table 6, and the number of blanks corresponding to the largest digit position is obtained from Table 6. source program error position detection means 2 for adding the number of blanks obtained in the source program; and source program error position display means for displaying the source program error position detected by the source program error detection means 2 on a source program list. It consists of 3.

In addition, in the following explanation, "syntactically meaningless white space"
I will say "blank" in the middle.

Figure 2 is the internal text table creation stage 1 in Figure 1.
3 is a flowchart showing the processing of FIG. The human-written source program 4 is scanned (Step 2), and only syntactically meaningful character strings are transferred to the internal text 5 in the storage area (Step 2). At this time, the position of the transferred character string within the internal text 5 is obtained (step +3). Furthermore, the number of blank spaces in the source program 4 up to that point is obtained (step 14). These two obtained values, ie, the position of the transferred character string in the internal text 5 and the number of spaces at that time, are combined into one element and stored in the table 6 (step 15). By repeating the above process (step +6), the human-written source program 4 is stored in the internal text 5 as a source program image with blanks removed. On the other hand, a table 6 is created in which one element is data consisting of the character position in the internal text 5 for each ninth position of the character string transferred into the internal text 5 and the number of spaces up to that point.

FIG. 3 is a flowchart showing the processing of the error position detection means 2 in the original program shown in FIG.

The digit position of the character in which the error was detected in the internal text 5 is determined (step 21), and if the same digit position exists in the table 6, the corresponding number of spaces is obtained (step 22.23); Obtain the number of spaces corresponding to the smallest and largest digit position (steps 22 and 24), and finally add the number of spaces to the digit position on the internal text 5 where the error was detected (step 25). The position within the source program image is obtained.

Next, a specific example of using this embodiment configured as described above will be described with reference to FIG. 4. The human-generated source program (FIG. 4 (1)) contains blank spaces at digit position 1, digit position 3, and digit positions 7 and 8. When the source program is scanned from the left, the first valid character string "A" is found in column position 2, and the number of spaces up to that point is 1, so the character "A" is inserted into the internal text (see Figure 4). 2)
) and store the character position 1 and the number of blanks 1 as the first space in the table (FIG. 4 (3)).

Next, when the source program (Figure 4 (1)) is scanned, the next valid character string "BCD" is found from digit position 4, and the number of blanks up to that point is 2, so the character "BCD" is found.
is moved to digit position 2 and beyond of the internal text (FIG. 4 (2)), and character position 2 and blank number 2 are stored as the next element in the table (FIG. 4 (3)). Similarly, when scanning the source program (Figure 4 (1)), the next valid character string "E" is found in column position 9, and the number of blanks up to that point is 4, so the character "E" is moved to column position 5 of the internal text, and character position 5 and blank number 4 are stored as the next element in the table (FIG. 4 (3)).

In this way, the source program containing blanks (Figure 4 (
1)) is the inner text with whitespace removed (see Figure 4 (2)).
)) and the included blank information (Figure 4 (3)).

Next, the internal text (Figure 4) consisting of the source program image with whitespace removed stored in the storage area is
2)) A method of restoring to the corresponding position in the original source program (FIG. 4(1)) when an error is detected in the process of translating it will be explained.

(1) If there is an error in the character "A", the digit position on the internal text is 1, so if you check the digit position of the element in the table, you will find the same value, so find the number 1 of the corresponding blank in the table. Obtainable. By adding these obtained values, digit position 1 on the internal text and number 1 of blanks up to that point, position 2 on the original source program is obtained.

(2) If there is an error in the character "B", the digit position on the internal text is 2, so if you check the digit position of the element in the table, you will find the same value, so calculate the number of corresponding spaces in the table, 2. Obtainable. By adding these obtained values to the digit position 2 on the internal text and the number of blanks up to that point 2, position 4 on the original source program is obtained.

(3) If there is an error in the character "D", the digit position on the internal text is 4, so if you check the digit position of the element in the table, there is no same value, but the digit that is smaller than that number and is the largest Since there is a position 2, we can obtain the corresponding number of blanks in the table, 2. By adding these obtained values, position 4 on the internal text and the number of blanks up to that point 2, position 6 on the original source program is obtained.

(Effects of the Invention) As explained above, the present invention provides an internal text in a format in which syntactically meaningless white space is removed in translation processing, a position within the internal text of a character string transferred to the internal text, By creating a table consisting of the number of spaces up to that character string and detecting the position in the source program of the character where the error was detected from the internal text and the table, processing can be performed efficiently. This has the effect of making it easier for those who make mistakes to find the location of the error.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the method for displaying errors in a source program according to the present invention, and FIG.
Flowchart showing processing of table creation means 1, 3rd
This figure is a flowchart showing the processing of the error position detection means 2 in the original program in FIG. 2, and FIG. 4 is a diagram showing a specific example when this embodiment is used. 1...Internal text table creation means, 2-
-----・Source program error position detection means, 3...
...Error position display means in source program, 4---
---Source program, 5--Internal text, 6...Table.

Claims (1)

[Claims] Scanning a source program and sequentially transferring only syntactically meaningful character strings to an internal text area of a storage area,
Obtain the position in the internal text area of the string transferred to the internal text area and the number of syntactically meaningless spaces that appear up to that string, and store these as a pair in a table. After the internal text and table are created by the table creation means and the internal text table creation means, the digit position on the internal text of the character in which an error was detected during the process of translating the source program of the internal text is determined, and the If there is a position, the number of blanks corresponding to the position is obtained from the table, and if there is no same digit position, the number of blanks corresponding to the largest digit position that is smaller than the digit position is obtained from the table, and the number of blanks corresponding to the digit position is obtained from the table. a source program error position detection means for adding the number of blank spaces; and a source program error position display means for displaying the error position in the source program detected by the source program error position detection means on a source program list. In-program error position detection method.