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	Initial commit for yacc shaving contest. - brcon2024-hackathons - Bitreichcon 2…
	git clone git://bitreich.org/brcon2024-hackathons git://enlrupgkhuxnvlhsf6lc3fz…
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	---
	commit fe1953cc524f2263d68e4bd294c5c97364270469
	Author: Christoph Lohmann <[email protected]>
	Date: Wed, 12 Jun 2024 16:39:10 +0200

	Initial commit for yacc shaving contest.

	Diffstat:
	A yacc-shaving/brainfuck/README.md \| 11 +++++++++++
	A yacc-shaving/brainfuck/brainfuck-e… \| 2 ++
	A yacc-shaving/brainfuck/brainfuck.l \| 22 ++++++++++++++++++++++
	A yacc-shaving/brainfuck/brainfuck.y \| 45 +++++++++++++++++++++++++++++…
	A yacc-shaving/brainfuck/makefile \| 34 +++++++++++++++++++++++++++++…

	5 files changed, 114 insertions(+), 0 deletions(-)
	---
	diff --git a/yacc-shaving/brainfuck/README.md b/yacc-shaving/brainfuck/README.md
	@@ -0,0 +1,11 @@
	+# Brainfuck Example
	+
	+This is a example to get the grasp on how yacc(1) and lex(1) interact.
	+
	+## Build Instructions
	+
	+ % make
	+ % ./brainfuck < brainfuck-example.bf
	+
	+Have fun!
	+
	diff --git a/yacc-shaving/brainfuck/brainfuck-example.bf b/yacc-shaving/brainfu…
	@@ -0,0 +1,2 @@
	+[->+<]
	+
	diff --git a/yacc-shaving/brainfuck/brainfuck.l b/yacc-shaving/brainfuck/brainf…
	@@ -0,0 +1,22 @@
	+%{
	+#include "y.tab.h"
	+%}
	+
	+%%
	+
	+">" { return INCPTR; }
	+"<" { return DECPTR; }
	+"+" { return INCVAL; }
	+"-" { return DECVAL; }
	+"." { return OUTPUT; }
	+"," { return INPUT; }
	+"[" { return LOOPSTART; }
	+"]" { return LOOPEND; }
	+. { /* ignore any other character */ }
	+
	+%%
	+
	+int yywrap(void) {
	+ return 1;
	+}
	+
	diff --git a/yacc-shaving/brainfuck/brainfuck.y b/yacc-shaving/brainfuck/brainf…
	@@ -0,0 +1,45 @@
	+%{
	+#include <stdio.h>
	+
	+void yyerror(const char *s);
	+int yylex(void);
	+
	+%}
	+
	+%token INCPTR DECPTR INCVAL DECVAL OUTPUT INPUT LOOPSTART LOOPEND
	+
	+%%
	+
	+program:
	+ /* empty */
	+ \| program command
	+ ;
	+
	+command:
	+ INCPTR { printf("Move pointer to the right\n"); }
	+ \| DECPTR { printf("Move pointer to the left\n"); }
	+ \| INCVAL { printf("Increment the value at the pointer\n"); }
	+ \| DECVAL { printf("Decrement the value at the pointer\n"); }
	+ \| OUTPUT { printf("Output the value at the pointer\n"); }
	+ \| INPUT { printf("Input a value and store it at the pointer\n"); }
	+ \| loop
	+ ;
	+
	+loop:
	+ LOOPSTART program LOOPEND
	+ {
	+ printf("Start of loop\n");
	+ printf("End of loop\n");
	+ }
	+ ;
	+
	+%%
	+
	+void yyerror(const char *s) {
	+ fprintf(stderr, "Error: %s\n", s);
	+}
	+
	+int main(void) {
	+ return yyparse();
	+}
	+
	diff --git a/yacc-shaving/brainfuck/makefile b/yacc-shaving/brainfuck/makefile
	@@ -0,0 +1,34 @@
	+CC = gcc
	+LEX = lex
	+YACC = yacc
	+YACCFLAGS = -d
	+
	+TARGET = brainfuck
	+LEX_SRC = brainfuck.l
	+YACC_SRC = brainfuck.y
	+LEX_GEN = lex.yy.c
	+YACC_GEN = y.tab.c y.tab.h
	+OBJ = y.tab.o lex.yy.o
	+
	+all: $(TARGET)
	+
	+$(TARGET): $(OBJ)
	+ $(CC) -o $@ $^
	+
	+lex.yy.o: $(LEX_GEN)
	+ $(CC) -c $< -o $@
	+
	+y.tab.o: y.tab.c
	+ $(CC) -c $< -o $@
	+
	+$(LEX_GEN): $(LEX_SRC)
	+ $(LEX) $<
	+
	+$(YACC_GEN): $(YACC_SRC)
	+ $(YACC) $(YACCFLAGS) $<
	+
	+clean:
	+ rm -f $(TARGET) $(OBJ) $(LEX_GEN) $(YACC_GEN)
	+
	+.PHONY: all clean
	+