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report: select: add structs for report selection

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This is rebased and edited version of the original design and
patch proposed by Jun'ichi Nomura:
  http://www.redhat.com/archives/dm-devel/2007-April/msg00025.html

This patch defines operators and structures that will be used
to store the report selection against which the actual values
reported will be checked.

  Selection operators
  -------------------
    Comparison operators:
        =~  - Matching regular expression.
        !~  - Not matching regular expression.
         =  - Equal to.
        !=  - Not equal to.
        >=  - Greater than or equal to.
         >  - Greater than
        <=  - Less than or equal to.
         <  - Less than.

    Logical and grouping operators:
        &&  - All fields must match
         ,  - All fields must match
        ||  - At least one field must match
         #  - At least one field must match
         !  - Logical negation
         (  - Left parenthesis
         )  - Right parenthesis
This commit is contained in:
Peter Rajnoha 2014-05-29 09:37:41 +02:00
parent 7dbbc05a69
commit 4118dd8da3
1 changed files with 83 additions and 0 deletions
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83
libdm/libdm-report.c
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@ -67,6 +67,89 @@ struct field_properties {
uint32_t flags;
};
/*
* Report selection
*/
struct op_def {
const char *string;
uint32_t flags;
const char *desc;
};
#define FLD_CMP_MASK 0x000FF000
#define FLD_CMP_EQUAL 0x00001000
#define FLD_CMP_NOT 0x00002000
#define FLD_CMP_GT 0x00004000
#define FLD_CMP_LT 0x00008000
#define FLD_CMP_REGEX 0x00010000
#define FLD_CMP_NUMBER 0x00020000
/*
* #define FLD_CMP_STRING 0x00040000
* We could defined FLD_CMP_STRING here for completeness here,
* but it's not needed - we can check operator compatibility with
* field type by using FLD_CMP_REGEX and FLD_CMP_NUMBER flags only.
*/
/*
* When defining operators, always define longer one before
* shorter one if one is a prefix of another!
* (e.g. =~ comes before =)
*/
static struct op_def _op_cmp[] = {
{ "=~", FLD_CMP_REGEX, "Matching regular expression." },
{ "!~", FLD_CMP_REGEX|FLD_CMP_NOT, "Not matching regular expression." },
{ "=", FLD_CMP_EQUAL, "Equal to." },
{ "!=", FLD_CMP_NOT|FLD_CMP_EQUAL, "Not equal to." },
{ ">=", FLD_CMP_NUMBER|FLD_CMP_GT|FLD_CMP_EQUAL, "Greater than or equal to." },
{ ">", FLD_CMP_NUMBER|FLD_CMP_GT, "Greater than" },
{ "<=", FLD_CMP_NUMBER|FLD_CMP_LT|FLD_CMP_EQUAL, "Lesser than or equal to." },
{ "<", FLD_CMP_NUMBER|FLD_CMP_LT, "Lesser than." },
{ NULL, 0, NULL }
};
#define SEL_MASK 0x000000FF
#define SEL_ITEM 0x00000001
#define SEL_AND 0x00000002
#define SEL_OR 0x00000004
#define SEL_MODIFIER_MASK 0x00000F00
#define SEL_MODIFIER_NOT 0x00000100
#define SEL_PRECEDENCE_MASK 0x0000F000
#define SEL_PRECEDENCE_PS 0x00001000
#define SEL_PRECEDENCE_PE 0x00002000
static struct op_def _op_log[] = {
{ "&&", SEL_AND, "All fields must match" },
{ ",", SEL_AND, "All fields must match" },
{ "||", SEL_OR, "At least one field must match" },
{ "#", SEL_OR, "At least one field must match" },
{ "!", SEL_MODIFIER_NOT, "Logical negation" },
{ "(", SEL_PRECEDENCE_PS, "Left parenthesis" },
{ ")", SEL_PRECEDENCE_PE, "Right parenthesis" },
{ NULL, 0, NULL},
};
struct field_selection {
struct field_properties *fp;
uint32_t flags;
union {
const char *s;
uint64_t i;
double d;
struct dm_regex *r;
} v;
};
struct selection_node {
struct dm_list list;
uint32_t type;
union {
struct field_selection *item;
struct dm_list set;
} selection;
};
/*
* Report data field
*/