https://github.com/aggstam/flex-robot-language
Simple Flex program producing the corresponding C code to validate the syntax of provided RobotLanguage (.rl) code file.
https://github.com/aggstam/flex-robot-language
c flex language-processing
Last synced: 7 months ago
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Simple Flex program producing the corresponding C code to validate the syntax of provided RobotLanguage (.rl) code file.
- Host: GitHub
- URL: https://github.com/aggstam/flex-robot-language
- Owner: aggstam
- License: gpl-3.0
- Created: 2023-01-24T11:51:30.000Z (over 2 years ago)
- Default Branch: master
- Last Pushed: 2023-05-16T13:35:57.000Z (over 2 years ago)
- Last Synced: 2025-01-12T20:33:33.645Z (9 months ago)
- Topics: c, flex, language-processing
- Language: Lex
- Homepage:
- Size: 19.5 KB
- Stars: 0
- Watchers: 2
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
# flex_robot_language
Simple Flex program producing the corresponding C code to validate the syntax of provided RobotLanguage (.rl) code file.
RobotLanguange LL grammar:
- Robot ::= name “{“ Rules “}”
- Rules ::= “init” R
- R ::= Rule R | ε
- Rule ::= sensor Op T_NUM Action | “halt”
- Action ::= “move” T_NUM | “turn” “left” | “turn” “right
FIRST and FOLLOW sets of grammar:
- FIRST(Robot)={“names”}, FOLLOW(Robot)={EOF}
- FIRST(Rules)={“init”}, FOLLOW(Rules)={“}”}
- FIRST(R)={sensor, “halt”, ε}, FOLLOW(R)={“}”}
- FIRST(Rule)={sensor, “halt”}, FOLLOW(Rule)={sensor, “halt”, “}”}
- FIRST(Action)={“move”, “turn”}, FOLLOW(Action)={sensor, “halt”, “}”}
Compilation and tests execution is streamline via a Makefile.
Three valid and one invalid test RobotLanguage code files have been provided to play with.
## Usage
```
% make
```
Makefile can be configured to use a different test case set and/or files.
## Execution example
```
❯ make
flex -o flex_robot_language.c flex_robot_language.l
gcc flex_robot_language.c -o flex_robot_language -lfl
./flex_robot_language test_robot_0.rl
File syntax is correct!
./flex_robot_language test_robot_1.rl
File syntax is correct!
./flex_robot_language test_robot_2.rl
File syntax is correct!
./flex_robot_language test_robot_error.rl
Syntax Error reading . at line 3 of input.
make: [Makefile:15: all] Error 255 (ignored)
```