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// SPDX-License-Identifier: GPL-3.0-or-later
// Package cond compiles the s-expression conditions of a rule's (when ...)
// into a tree that the evaluator walks against one file's facts.
package cond
import (
"regexp"
"time"
"krino/internal/sexp"
)
// Options carries a rule's resolved case and fold settings into compilation.
type Options struct {
IgnoreCase bool // the rule's resolved case setting is "ignore"
Fold bool // the rule's resolved fold setting
}
// Cond is a compiled condition. A Cond compiled from no conditions (a rule
// without when) is always true.
type Cond struct {
root *node // nil: always true
opt Options // the case/fold settings conditions were compiled with; needed again at eval time
UsesContent bool // some content test exists
DupDirs [][]string // the raw directory arguments of each duplicate test, in order
Keywords []Keyword // every content keyword, as compiled, in order
}
// Keyword is one content keyword as a content test compares it: normalised
// under the options it was compiled with.
type Keyword struct {
Opt Options
Norm string
}
// Key is the keyword's identity across runs, for the keyword cache: its
// options and its normalised text.
func (k Keyword) Key() string { return KeywordKey(k.Opt, k.Norm) }
// KeywordKey is Keyword.Key for opt and an already normalised keyword.
func KeywordKey(opt Options, norm string) string {
b := []byte("sn:")
if opt.IgnoreCase {
b[0] = 'i'
}
if opt.Fold {
b[1] = 'f'
}
return string(b) + norm
}
// kind is what a compiled node tests, or how it combines its children.
type kind int
const (
kAnd kind = iota
kOr
kNot
kType
kName
kPath
kContent
kSize
kAge
kDuplicate
kMatched
)
// Costs, per the brief's cost order: cheapest first when sorting and/or
// children. not takes its child's cost; and/or take the sum of theirs.
const (
costCheap = 1 // type, size, age, matched
costRegex = 2 // name, path
costDuplicate = 5
costContent = 10
)
// pattern is one name/path regex, compiled and paired with the text it was
// written as (undecorated by (?i) or folding), for labels and reasons.
type pattern struct {
re *regexp.Regexp
src string
}
// keyword is one content keyword, normalised for matching and paired with
// the text it was written as, for labels and reasons.
type keyword struct {
norm string
src string
}
// node is one compiled condition: a leaf test, or an and/or/not combinator
// over other nodes. The evaluator walks this tree.
type node struct {
kind kind
pos sexp.Pos // the position of the node as written, for diagnostics
label string // the test as written, e.g. `content "acme ltd" "0000000000"`
cost int // this node's evaluation cost; and/or sort children by it
children []*node // and, or, not
// type
suffixes []string // leading-dot, lower-case, e.g. ".pdf"
// name, path
patterns []pattern
// content
keywords []keyword
// size, age (kind tells which is populated)
op string
sizeVal int64
ageVal time.Duration
// duplicate
dirs []string
}
// NameGroups returns the number of capture groups of every name test in the
// condition that can ever supply captures, in compile order: a name test
// nested inside and/or counts however deep, but one inside a not does not
// (B1) - it can never be the source of Result.Captures, so it must not be
// asked to justify a rule's use of {N} either. Empty when the rule has no
// such name test.
func (c *Cond) NameGroups() []int {
var out []int
collectNameGroups(c.root, &out)
return out
}
// groups maps a (type ...) group name to the extensions it expands to,
// spec Appendix A.
// Group is the extensions a built-in type group holds - what (type image)
// means - so a front end can treat a file the way the rules do rather than
// keeping a second list of its own. The result is not to be modified.
func Group(name string) []string { return groups[name] }
var groups = map[string][]string{
"image": {"jpg", "jpeg", "png", "gif", "webp", "bmp", "tif", "tiff", "heic", "heif", "avif", "svg", "ico", "raw", "cr2", "nef", "arw", "dng"},
"video": {"mp4", "mkv", "webm", "mov", "avi", "m4v", "mpg", "mpeg", "wmv", "flv", "3gp"},
"audio": {"mp3", "flac", "ogg", "opus", "m4a", "aac", "wav", "wma", "aiff"},
"archive": {"zip", "tar", "gz", "tgz", "bz2", "tbz2", "xz", "txz", "zst", "7z", "rar", "lz", "lzma", "cpio"},
"document": {"pdf", "doc", "docx", "odt", "rtf", "txt", "md", "tex"},
"spreadsheet": {"xls", "xlsx", "ods", "csv", "tsv"},
"presentation": {"ppt", "pptx", "odp"},
"ebook": {"epub", "mobi", "azw", "azw3", "fb2", "djvu"},
"code": {"go", "c", "h", "cpp", "hpp", "py", "sh", "js", "ts", "rs", "java", "rb", "pl", "lua", "html", "css", "json", "yaml", "yml", "toml", "xml", "sql"},
"text": {"txt", "md", "log", "csv", "tsv", "json", "yaml", "yml", "toml", "xml", "ini", "conf"},
"package": {"deb", "rpm", "apk", "appimage", "exe", "msi", "flatpak", "snap"},
"font": {"ttf", "otf", "woff", "woff2"},
}
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