JPH0126090B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a character analysis method that enables a compiler to perform character analysis processing at high speed.

Figure 1 shows an overview of the compiler system, in which 1 is a paper tape, 2 is a paper card, 3 is a magnetic tape, 4 is a magnetic disk, 5 is a reading device,
6 is the system space, 7 is the processing professional compiler,
8 is a work file, 9 is a result file, 10 is an output device, 11 is an LP list, 12 is a magnetic tape,
Reference numeral 13 indicates a magnetic disk. A source program is written on an input recording medium such as a paper tape 1, a paper card 2, a magnetic tape 3, or a magnetic disk 4.

The source programs recorded on these input recording media are read into the system space 6 (memory space allocated to the compiler) by the reading device 5 and processed by the compiler 7. The compiler 7 performs character string analysis, syntax analysis, optimization, and object code generation of the source program. The work file 8 is used to temporarily store intermediate results in the compilation process. The object code generated by the compiler 7 is written to a result file 9,
After the conversion of the source program into the object program is completely completed, the contents of the result file 9 are outputted to the LP list 11, the magnetic tape 12, or the magnetic disk 13 by the output device 10.

FIG. 2 explains a conventional character analysis method. First, a character string for one record to be subjected to character analysis is extracted. Then, each character on this record is read and character analysis is performed to determine the type of character. For example, if the character is an alphabetic character, the alphabetic character is processed, if the character is a number, the numeric character is processed, if the character is an operator, the operator is processed, and if the character is a delimiter, the delimiter is processed. The processing unit for each character also checks what number the character is, and if a character is detected after the delimiter, an error occurs. After character processing is performed for one character, the byte position to be read from the record is advanced to the next byte position, and it is checked whether the record has ended. Yes
In this case, fetch the next record as the end,
If NO, perform character analysis on the next character.

The character analysis method shown in Figure 2 checks every byte of an n-byte record from the 1st byte to the nth byte, which increases the number of IO accesses and increases the work area. , and the number of processing steps becomes large.Furthermore, since data handling becomes complicated, bugs are likely to occur.

The present invention aims to eliminate the above-mentioned drawbacks and to provide a character analysis method that enables a compiler to efficiently perform character analysis. Therefore, the character analysis method of the present invention includes a reading device that reads a source program, a processor for creating a compiler that converts the read source program into an object program, and a processor for creating an object program. and an output device for outputting a read object program, and the compiler creation processor is configured to extract data one record at a time from the read source program and analyze characters constituting the extracted records. In the compiler system, when performing character analysis processing, if a delimiter is detected, the data from the next byte position to the last byte position of the record is compared with a normal expected pattern. . Hereinafter, the present invention will be explained with reference to the drawings.

FIG. 3 illustrates one embodiment of the present invention. In FIG. 3, x indicates the detected byte position of the delimiter. First, a character string for one record is extracted. Then, one character on this record is read, character analysis is performed, and the type of the character is determined. If the character is an alphabetic character, the alphabetic character is processed as shown in FIG. 2, if the character is a numeric character, the numeric character is processed, and if the character is an operator, the operator is processed. However, in the case of the present invention, the processing unit for each character does not need to check the number of the character. After character processing is performed, the byte position read from the record is advanced to the next byte position, and it is checked whether the record has ended. If Yes, terminate, NO
In this case, the next character is analyzed. If the character analysis result is a delimiter, the data from the x+1st byte to the nth byte on the record is (n-x+
1) Compare with a blank pattern in which all bits are "0". An n-bit blank pattern is prepared in advance, and from this n-bit blank pattern (n-x
+1) A blank pattern of bits is cut out. Compare the data from the next position of the delimiter to the last position with a blank pattern of (n-x+1) bits,
If they match, the process ends and the next record is retrieved; if they do not match, an error is displayed.

As is clear from the above description, according to the present invention, the processing unit for each character type does not need to be aware of the number of the character, so processing is simplified, and data access is simplified. Remarkable effects such as a reduction in the number of steps and a reduction in the number of dynamic steps can be achieved.

[Brief explanation of drawings]

Figure 1 is a diagram showing an overview of the compiler system, Figure 2 is a diagram explaining the conventional character analysis method,
FIG. 3 illustrates one embodiment of the present invention. 1... paper tape, 2... paper card, 3... magnetic tape, 4... magnetic disk, 5... reading device,
6...System space, 7...Processing professional compiler, 8...Work file, 9...Result file, 10...Output device, 11...LP list, 1
2...magnetic tape, 13...magnetic disk.

Claims (1)

[Claims] 1 A reading device that reads a source program, a compiler creation processor that converts the read source program into an object program, and an output device that outputs the object program created by the compiler creation processor. The compiler creation processor extracts data one record at a time from the loaded source program and performs character analysis processing in a compiler system configured to analyze characters constituting the extracted records. A character analysis method that is characterized in that when a delimiter is detected, the data from the next byte position to the last byte position of the record is compared with a normal expected pattern.