Files
mgmt/lang/ast/scopegraph.go
James Shubin cf7e73bbf6 lang: Add a for loop statement for iterating over a list
This adds a for statement which is used to iterate over a list with a
body of statements. This is an important data transformation tool which
should be used sparingly, but is important to have.

An import statement inside of a for loop is not currently supported. We
have a simple hack to detect the obvious cases, but more deeply nested
scenarios probably won't be caught, and you'll get an obscure error
message if you try to do this.

This was incredibly challenging to get right, and it's all thanks to Sam
for his brilliance.

Co-authored-by: Samuel Gélineau <gelisam@gmail.com>
2025-03-08 17:45:29 -05:00

252 lines
7.5 KiB
Go

// Mgmt
// Copyright (C) James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.
package ast
import (
"fmt"
"github.com/purpleidea/mgmt/lang/interfaces"
"github.com/purpleidea/mgmt/pgraph"
)
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtBind) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtRes) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
name, ok := obj.Name.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
name.ScopeGraph(g)
g.AddEdge(obj, obj.Name, &pgraph.SimpleEdge{Name: "name"})
for _, resContents := range obj.Contents {
switch r := resContents.(type) {
case *StmtResField:
rValue, ok := r.Value.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
rValue.ScopeGraph(g)
g.AddEdge(obj, r.Value, &pgraph.SimpleEdge{Name: r.Field})
}
}
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtEdge) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtIf) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtFor) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtProg) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
for _, stmt := range obj.Body {
stmt, ok := stmt.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
stmt.ScopeGraph(g)
g.AddEdge(obj, stmt, &pgraph.SimpleEdge{Name: ""})
}
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtFunc) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtClass) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtInclude) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtImport) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *StmtComment) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprBool) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprStr) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprInt) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprFloat) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprList) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprMap) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprStruct) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprFunc) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
if obj.Body != nil {
body, ok := obj.Body.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
body.ScopeGraph(g)
g.AddEdge(obj, obj.Body, &pgraph.SimpleEdge{Name: "body"})
}
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprCall) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
expr, ok := obj.expr.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
expr.ScopeGraph(g)
g.AddEdge(obj, obj.expr, &pgraph.SimpleEdge{Name: "expr"})
for i, arg := range obj.Args {
arg, ok := arg.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
arg.ScopeGraph(g)
g.AddEdge(obj, arg, &pgraph.SimpleEdge{Name: fmt.Sprintf("arg%d", i)})
}
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprVar) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
target := obj.scope.Variables[obj.Name]
newTarget, ok := target.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
newTarget.ScopeGraph(g)
g.AddEdge(obj, target, &pgraph.SimpleEdge{Name: "target"})
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprParam) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprIterated) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
definition, ok := obj.Definition.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
definition.ScopeGraph(g)
g.AddEdge(obj, obj.Definition, &pgraph.SimpleEdge{Name: "def"})
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprPoly) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
definition, ok := obj.Definition.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
definition.ScopeGraph(g)
g.AddEdge(obj, obj.Definition, &pgraph.SimpleEdge{Name: "def"})
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprTopLevel) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
definition, ok := obj.Definition.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
definition.ScopeGraph(g)
g.AddEdge(obj, obj.Definition, &pgraph.SimpleEdge{Name: "def"})
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprSingleton) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
definition, ok := obj.Definition.(interfaces.ScopeGrapher)
if !ok {
panic("can't graph scope") // programming error
}
definition.ScopeGraph(g)
g.AddEdge(obj, obj.Definition, &pgraph.SimpleEdge{Name: "def"})
}
// ScopeGraph adds nodes and vertices to the supplied graph.
func (obj *ExprIf) ScopeGraph(g *pgraph.Graph) {
g.AddVertex(obj)
}