Specifying a Parser Using a Properties File
A system for generating a parser and using the parser to parse a target file includes a target file description, an output format description, a Parser generator, a Parser, a target file, and a result object. The target file description and the output format description are included in one or more “properties files”, which are text files that include one or more name/value pairs (“properties”). The target file description and the output format description are input into the Parser generator, which outputs the Parser. The target file is input into the Parser, which outputs the result object. The target file description specifies one or more parsers and/or tokenizers that can be used to parse the target file. The parsers and/or tokenizers specified by the target file description are part of the generated Parser. These parsers and/or tokenizers make the Parser more flexible, which enables the Parser to parse semi-structured data.
1 . A method for generating a Parser to parse a target file, comprising:
receiving a description of the target file, wherein the target file description describes a grammar of the target file by specifying a set of one or more parsers, and wherein each parser specification includes one or more pairs of a name and a value;
creating a data structure that represents the target file description; and
creating, for each parser in the set of parsers, an object that can parse a string.
2 . The method of claim 1 , wherein the target file describes a configuration of a device.
3 . The method of claim 1 , wherein the target file was output by a device in response to a command that was received by the device.
4 . The method of claim 1 , further comprising:
receiving a description of an output format, wherein the output format description describes a format of an output of the Parser by specifying a result object, and wherein the result object specification includes a set of one or more pairs of a name and a value; and
creating the result object;
wherein a parser object sets a value of an attribute of the result object based on a string.
5 . The method of claim 4 , wherein the target file describes a configuration of a device, and wherein the result object is an extensible data structure that includes custom-defined fields whose values reflect the device configuration.
6 . The method of claim 4 , wherein the target file was output by a device in response to a command that was received by the device, and wherein the result object is used to generate a command to send to the device.
7 . A computer program product for generating a Parser to parse a target file, wherein the computer program product is stored on a computer-readable medium that includes instructions that, when loaded into memory, cause a processor to perform a method, the method comprising:
receiving a description of the target file, wherein the target file description describes a grammar of the target file by specifying a set of one or more parsers, and wherein each parser specification includes one or more pairs of a name and a value;
creating a data structure that represents the target file description; and
creating, for each parser in the set of parsers, an object that can parse a string.
8 . A system for generating a Parser to parse a target file, the system comprising:
a computer-readable medium that includes instructions that, when loaded into memory, cause a processor to perform a method, the method comprising:
receiving a description of the target file, wherein the target file description describes a grammar of the target file by specifying a set of one or more parsers, and wherein each parser specification includes one or more pairs of a name and a value;
creating a data structure that represents the target file description; and
creating, for each parser in the set of parsers, an object that can parse a string; and
a processor for performing the method.