From 30047205e440e9ad8984e1830b8b819b5fe1f9f7 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Fri, 16 Apr 2021 10:02:33 +0530
Subject: add prog 5

---
 4/input   |  4 ++++
 4/main.l  |  7 +++----
 5/input   |  5 +++++
 5/main.l  | 24 ++++++++++++++++++++++++
 flake.nix | 59 ++++++++++++++++++++++++++++++-----------------------------
 5 files changed, 66 insertions(+), 33 deletions(-)
 create mode 100644 5/input
 create mode 100644 5/main.l

diff --git a/4/input b/4/input
index 7f0cc0b..d1dff11 100644
--- a/4/input
+++ b/4/input
@@ -2,4 +2,8 @@ int main() {
     int n;
     printf("hello world");
     scanf("%d", &n);
+    printf("hello world");
+    printf("hello world");
+    printf("hello world");
+    printf("hello world");
 }
diff --git a/4/main.l b/4/main.l
index f768382..28593f6 100644
--- a/4/main.l
+++ b/4/main.l
@@ -13,7 +13,7 @@ printf {
     prints++;
     fprintf(yyout, "writef"); 
 }
-; fprintf(yyout, "%s", yytext);
+. fprintf(yyout, "%s", yytext);
 \n fprintf(yyout, "\n");
 %%
 
@@ -21,13 +21,12 @@ int main(void) {
     yyin=fopen("4/input", "r+");
     yyout=fopen("4/output", "w");
     yylex();
-    printf("%d printf occurrences\n", prints);
-    printf("%d scanf  occurrences\n", scans);
+    printf("%d printf occurrence(s)\n", prints);
+    printf("%d scanf  occurrence(s)\n", scans);
 }
 
 int yywrap()
 {
-exit(0);
     return(1);
 }
 
diff --git a/5/input b/5/input
new file mode 100644
index 0000000..8be510e
--- /dev/null
+++ b/5/input
@@ -0,0 +1,5 @@
+int main() {
+    int one, two, three;
+    three = two + one;
+    printf(three);
+}
diff --git a/5/main.l b/5/main.l
new file mode 100644
index 0000000..ee13053
--- /dev/null
+++ b/5/main.l
@@ -0,0 +1,24 @@
+%{
+    int k = 0;
+    int o = 0;
+    int i = 0;
+%}
+
+%%
+int|main|printf|scanf|char|if|else|for|switch|case k++;
+[+*/%&=] o++;
+[a-zA-Z_][a-zA-Z0-9_]* i++;
+. ;
+\n ;
+%%
+
+int main(void) {
+    yylex();
+    printf("%d keywords\n", k);
+    printf("%d operators\n", o);
+    printf("%d identifiers\n", i);
+}
+
+int yywrap() {
+    return 1;
+}
diff --git a/flake.nix b/flake.nix
index b8892fa..c85db6e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -4,37 +4,38 @@
   };
 
   outputs = { self, nixpkgs, utils, ... }:
-  utils.lib.eachDefaultSystem (system: 
-  let
-    pkgs = nixpkgs.legacyPackages."${system}";
-    nativeBuildInputs = with pkgs; [
-      flex
-      bison
-    ];
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages."${system}";
+        nativeBuildInputs = with pkgs; [
+          flex
+          bison
+        ];
 
-    buildScript = pkgs.writeScriptBin "build-script"
-    ''
-      set -e
-      prog_name="$1"
-      outdir="outputs/$prog_name"
-      mkdir -p "$outdir"
+        buildScript = pkgs.writeScriptBin "build-script"
+          ''
+            set -e
+            prog_name="$1"
+            outdir="outputs/$prog_name"
+            mkdir -p "$outdir"
 
-      ${pkgs.flex}/bin/flex -o "$outdir"/lex.yy.cc "$prog_name"/main.l
-      ${pkgs.gcc}/bin/gcc "$outdir"/lex.yy.cc -o "$outdir"/exec
+            ${pkgs.flex}/bin/flex -o "$outdir"/lex.yy.cc "$prog_name"/main.l
+            ${pkgs.gcc}/bin/gcc "$outdir"/lex.yy.cc -o "$outdir"/exec
 
-      ./"$outdir"/exec < "$prog_name"/input
-      rm -r "outputs"/*
-      '';
+            ./"$outdir"/exec < "$prog_name"/input
+            rm -r outputs
+          '';
 
-  in rec {
-    devShell = pkgs.mkShell {
-      nativeBuildInputs = nativeBuildInputs ++ (with pkgs; [
-        gcc
-      ]);
-    };
-    defaultApp = {
-      type = "app";
-      program = "${buildScript}/bin/build-script";
-    };
-  });
+      in
+      rec {
+        devShell = pkgs.mkShell {
+          nativeBuildInputs = nativeBuildInputs ++ (with pkgs; [
+            gcc
+          ]);
+        };
+        defaultApp = {
+          type = "app";
+          program = "${buildScript}/bin/build-script";
+        };
+      });
 }
-- 
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