Merge pull request #54 from yui-knk/integration_tests

Add integration test

spec/lrama/integration_spec.rb

@@ -0,0 +1,112 @@
+require "tempfile"
+require "open3"
+
+RSpec.describe "integration" do
+ module IntegrationHelper
+ def test_rules(rules, input, expected)
+ cases = input.each_with_index.map do |(token, union, semantic_value), i|
+ str = ""
+ str << " case #{i}:\n"
+ str << " yylval->#{union} = #{semantic_value};\n" if union && semantic_value
+ str << " return #{token};\n"
+ end.join("\n")
+
+ grammar = <<~Grammar
+%{
+#include <stdio.h>
+
+#include "test.h"
+
+static int yylex(YYSTYPE *val, YYLTYPE *loc);
+static int yyerror(YYLTYPE *loc, const char *str);
+%}
+
+#{rules}
+
+// #{input}
+
+int c = 0;
+
+static int yylex(YYSTYPE *yylval, YYLTYPE *loc) {
+ switch (c++) {
+#{cases}
+ default:
+ // End of Input
+ return -1;
+ }
+}
+
+static int yyerror(YYLTYPE *loc, const char *str) {
+ fprintf(stderr, "parse error: %s\\n", str);
+ return 0;
+}
+
+int main() {
+ yyparse();
+ return 0;
+}
+
+ Grammar
+
+ Tempfile.create(%w[test .y]) do |f|
+ f << grammar
+ f.close
+ c_path = File.dirname(f.path) + "/test.c"
+ obj_path = File.dirname(f.path) + "/test"
+
+ Lrama::Command.new.run(%W[-d #{f.path} -o #{c_path}])
+
+ `gcc -Wall #{c_path} -o #{obj_path}`
+
+ result = Open3.popen3(obj_path) do |stdin, stdout, stderr, wait_thr|
+ stdout.read
+ end
+
+ expect(result).to eq(expected)
+ end
+ end
+ end
+
+ include IntegrationHelper
+
+ describe "calculator" do
+ it "returns 9 for '(1+2)*3'" do
+ # (1+2)*3 #=> 9
+ input = [
+ %w['('],
+ %w[NUM val 1],
+ %w['+'],
+ %w[NUM val 2],
+ %w[')'],
+ %w['*'],
+ %w[NUM val 3]
+ ]
+ expected = "9"
+
+ test_rules(<<~Rules, input, "=> 9")
+ %union {
+ int val;
+ }
+ %token <val> NUM
+ %type <val> expr
+ %left '+' '-'
+ %left '*' '/'
+
+ %%
+
+ program : /* empty */
+ | expr { printf("=> %d", $1); }
+ ;
+ expr : NUM
+ | expr '+' expr { $$ = $1 + $3; }
+ | expr '-' expr { $$ = $1 - $3; }
+ | expr '*' expr { $$ = $1 * $3; }
+ | expr '/' expr { $$ = $1 / $3; }
+ | '(' expr ')' { $$ = $2; }
+ ;
+
+ %%
+ Rules
+ end
+ end
+end