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v/vlib/v/depgraph/depgraph.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
// Directed acyclic graph
// this implementation is specifically suited to ordering dependencies
module depgraph
struct DepGraphNode {
mut:
name string
deps []string
}
struct DepGraph {
pub mut:
acyclic bool
nodes []DepGraphNode
}
struct OrderedDepMap {
mut:
keys []string
data map[string][]string
}
pub fn (o mut OrderedDepMap) set(name string, deps []string) {
if name !in o.data {
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o.keys << name
}
o.data[name] = deps
}
pub fn (o mut OrderedDepMap) add(name string, deps []string) {
mut d := o.data[name]
for dep in deps {
if dep !in d {
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d << dep
}
}
o.set(name, d)
}
pub fn (o &OrderedDepMap) get(name string) []string {
return o.data[name]
}
pub fn (o mut OrderedDepMap) delete(name string) {
if name !in o.data {
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panic('delete: no such key: $name')
}
for i, _ in o.keys {
if o.keys[i] == name {
o.keys.delete(i)
break
}
}
o.data.delete(name)
}
pub fn (o mut OrderedDepMap) apply_diff(name string, deps []string) {
mut diff := []string
for dep in o.data[name] {
if dep !in deps {
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diff << dep
}
}
o.set(name, diff)
}
pub fn (o &OrderedDepMap) size() int {
return o.data.size
}
pub fn new_dep_graph() &DepGraph {
return &DepGraph{
acyclic: true
}
}
pub fn (graph mut DepGraph) add(mod string, deps []string) {
graph.nodes << DepGraphNode{
name: mod
deps: deps.clone()
}
}
pub fn (graph &DepGraph) resolve() &DepGraph {
mut node_names := OrderedDepMap{}
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mut node_deps := OrderedDepMap{}
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for node in graph.nodes {
node_names.add(node.name, node.deps)
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node_deps.add(node.name, node.deps)
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}
mut resolved := new_dep_graph()
for node_deps.size() != 0 {
mut ready_set := []string
for name in node_deps.keys {
deps := node_deps.data[name]
if deps.len == 0 {
ready_set << name
}
}
if ready_set.len == 0 {
mut g := new_dep_graph()
g.acyclic = false
for name in node_deps.keys {
g.add(name, node_names.data[name])
}
return g
}
for name in ready_set {
node_deps.delete(name)
resolved.add(name, node_names.data[name])
}
for name in node_deps.keys {
node_deps.apply_diff(name, ready_set)
}
}
return resolved
}
pub fn (graph &DepGraph) last_node() DepGraphNode {
return graph.nodes[graph.nodes.len - 1]
}
pub fn (graph &DepGraph) display() string {
mut out := '\n'
for node in graph.nodes {
for dep in node.deps {
out += ' * $node.name -> $dep\n'
}
}
return out
}
pub fn (graph &DepGraph) display_cycles() string {
mut node_names := map[string]DepGraphNode
for node in graph.nodes {
node_names[node.name] = node
}
mut out := '\n'
for node in graph.nodes {
for dep in node.deps {
if dep !in node_names {
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continue
}
dn := node_names[dep]
if node.name in dn.deps {
out += ' * $node.name -> $dep\n'
}
}
}
return out
}