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# File 'lib/trxl/trxl_grammar.rb', line 4914
def to_s(env = Environment.new)
help = "-----------------------------------------\n"
help = " TRXL Language HELP \n"
help = "-----------------------------------------\n"
help << "1) Built in operators:\n"
help << " +,-,*,/,%,==,!=,<=,>=,<,>,;\n"
help << "-----------------------------------------\n"
help << "2) Integers and floats in arithmetics:\n"
help << " 1 or 2.33333 or 0.34 or .34\n"
help << "-----------------------------------------\n"
help << "3) Arbitrary nesting of parentheses:\n"
help << " (1+2*(5+((3+4)*3)-6/2)+7*2)\n"
help << " => 61\n"
help << "-----------------------------------------\n"
help << "4) Comments:\n"
help << " # A comment until the end of the line\n"
help << " /* A longer comment that\n"
help << " spans multiple lines\n"
help << " */\n"
help << "-----------------------------------------\n"
help << "5) Built in keywords:\n"
help << " TRUE,FALSE,NULL,IF,ELSE,END\n"
help << "-----------------------------------------\n"
help << "6) Built in functions:\n"
help << " HELP,ENV,SIZE,SPLIT,ROUND,MIN,MAX\n"
help << " SUM, MULT, AVG, PRINT, PRINT_LINE\n"
help << " TO_INT, TO_FLOAT, TO_ARRAY, AVG_SUM\n"
help << " MATCHING_IDS, VALUES_OF_TYPE, COMPACT\n"
help << " IS_EMPTY, COMPACT_AVG\n"
help << "-----------------------------------------\n"
help << "7) Standard library functions:\n"
help << " foreach_in, inject, map, select\n"
help << " reject, in_groups_of, sum_of_type\n"
help << " avg_sum_of_type, avg_range_sum_of_type\n"
help << " total_range_sum_of_type, ratio\n"
help << " year_from_date, month_from_date\n"
help << " hash_values, hash_value_sum\n"
help << " avg_hash_value_sum, hash_range_values\n"
help << " hash_range_value_sum\n"
help << " avg_hash_range_value_sum\n"
help << "-----------------------------------------\n"
help << "8) Access the current environment:\n"
help << " ENV; (your output may differ)\n"
help << " => { :a => 3, :foo => 5 }\n"
help << " Given the following environment:\n"
help << " { :a => 1, :b => 2, :c => 3 }\n"
help << " ENV['a']\n"
help << " => 1\n"
help << " ENV['a'..'b']\n"
help << " => { :a => 1, :b => 2 }\n"
help << "-----------------------------------------\n"
help << "9) Numeric variables and literals\n"
help << " 3;\n"
help << " => 3\n"
help << " a = 3;\n"
help << " => 3\n"
help << " a;\n"
help << " => 3\n"
help << "-----------------------------------------\n"
help << "10) String variables and literals\n"
help << " \"This is a string\";\n"
help << " => \"This is a string\";\n"
help << " 'This is a string';\n"
help << " => \"This is a string\";\n"
help << " s1 = \"This is a string\"; s1;\n"
help << " => \"This is a string\"\n"
help << " s2 = 'This is a string'; s2;\n"
help << " => \"This is a string\"\n"
help << " SIZE(s1);\n"
help << " => 16\n"
help << " SIZE(\"foo\");\n"
help << " => 3\n"
help << "-----------------------------------------\n"
help << "11) Variables and closure applications\n"
help << " a = 3; foo = 5;\n"
help << " calc = fun(x,y) { (x + y) * a + foo };\n"
help << " calc(2,2);\n"
help << " => 17\n"
help << "-----------------------------------------\n"
help << "12) Array variables and literals\n"
help << " arr = [1, [fun(){2}()], fun(x){x}(3)]\n"
help << " SIZE(arr);\n"
help << " => 3\n"
help << " SIZE([1,2,3]);\n"
help << " => 3\n"
help << " [1,2,3] + [4,[5,6]];\n"
help << " => [1,2,3,4,[5,6]]\n"
help << " [1,2,3] - [[1],2,3];\n"
help << " => [1]\n"
help << "-----------------------------------------\n"
help << "13) Hash variables and literals\n"
help << " h = { 1 => fun(){2}(), 'a' => 'foo' }\n"
help << " SIZE(h);\n"
help << " => 2\n"
help << " h[1];\n"
help << " => 'fun(){2}()'\n"
help << " h['a'];\n"
help << " => 'foo'\n"
help << " SIZE({ 1 => 2});\n"
help << " => 1\n"
help << "-----------------------------------------\n"
help << "14) Range variables and literals\n"
help << " range_including_upper = 1..5\n"
help << " => [ 1, 2, 3, 4, 5 ]\n"
help << " SIZE(range_including_upper);\n"
help << " => 5\n"
help << " range_excluding_upper = 1...5\n"
help << " => [ 1, 2, 3, 4 ]\n"
help << " SIZE(range_excluding_upper);\n"
help << " => 4\n"
help << " SIZE([1..5);\n"
help << " => 5\n"
help << "-----------------------------------------\n"
help << "15) Conditional branching and recursion:\n"
help << " factorial = fun(x) {\n"
help << " if(x == 0)\n"
help << " 1\n"
help << " else\n"
help << " x * factorial(x - 1)\n"
help << " end\n"
help << " }\n"
help << " factorial(5);\n"
help << " => 120\n"
help << "-----------------------------------------\n"
help << "16) Conditional branching:\n"
help << " foo = fun(x) {\n"
help << " if(x == 0)\n"
help << " 0\n"
help << " elsif(x == 1)\n"
help << " 1\n"
help << " else\n"
help << " 2\n"
help << " end\n"
help << " }\n"
help << " foo(0);\n"
help << " => 0\n"
help << " foo(1);\n"
help << " => 1\n"
help << " foo(2);\n"
help << " => 2\n"
help << "-----------------------------------------\n"
help << "17) case expressions:\n"
help << " foo = fun(x) {\n"
help << " case x\n"
help << " when NULL then NULL\n"
help << " when 0 then 0\n"
help << " when 1 then 1\n"
help << " when 2 then 2\n"
help << " else 3\n"
help << " end\n"
help << " }\n"
help << " foo(1);\n"
help << " => 1\n"
help << " foo(3);\n"
help << " => 3\n"
help << "-----------------------------------------\n"
help
end
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