Merge pull request #1 from draios/parser-hacking

Digwatch compiler

lua/README.md

@@ -0,0 +1,6 @@
+Installation
+------------
+
+The sysdig grammar uses the `lpeg` parser. For now install it using luarocks:
+`luarocks install lpeg`.
+

lua/parser-smoke.sh

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+#!/bin/bash
+
+function error_exit_good
+{
+    echo "Error: '$1' did not parse" 1>&2
+    exit 1
+}
+
+function error_exit_bad
+{
+    echo "Error: incorrect filter '$1' parsed ok" 1>&2
+    exit 1
+}
+
+
+function good
+{
+    lua test.lua "a: x.y=1; b: a and z.x exists; c: b; $1" 2> /dev/null || error_exit_good "$1"
+}
+
+function bad
+{
+    lua test.lua "a: x.y=1; b: a and z.x exists; c: b; $1" 2> /dev/null && error_exit_bad "$1"
+}
+
+# Filters
+good "a"
+good "a and b"
+good "(a)"
+good "(a and b)"
+good "(a.a exists and b)"
+good "(a.a exists) and (b)"
+good "a.a exists and b"
+good "a.a=1 or b.b=2 and c"
+good "not (a)"
+good "not (not (a))"
+good "not (a.b=1)"
+good "not (a.a exists)"
+good "not a"
+good "not not a"
+good "(not not a)"
+good "not a.b=1"
+good "not a.a exists"
+good "notz: a and b; notz"
+good "a.b = bla"
+good "a.b = 'bla'"
+good "a.b = not"
+good "a.b contains bla"
+good "a.b icontains 'bla'"
+good "a.g in (1, 'a', b)"
+good "a.g in ( 1 ,, , b)"
+good "evt.dir=> and fd.name=*.log"
+good "evt.dir=> and fd.name=/var/log/httpd.log"
+good "a.g in (1, 'a', b.c)"
+good "a.b = a.a"
+
+bad "a.g in ()"
+bad "a.b = b = 1"
+bad "(a.b = 1"
+# Macros
+
+good "a: a.b exists"
+good "a: b and c"
+good "a: b"
+good "a : b"
+good "a : evt.dir=>"
+good "inbound: (syscall.type=listen and evt.dir='>') or (syscall.type=accept and evt.dir='<')"
+bad "a:"
+
+echo
+echo "All tests passed."
+exit 0