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|
package query
import (
"fmt"
"github.com/pelletier/go-toml"
)
// base match
type matchBase struct {
next pathFn
}
func (f *matchBase) setNext(next pathFn) {
f.next = next
}
// terminating functor - gathers results
type terminatingFn struct {
// empty
}
func newTerminatingFn() *terminatingFn {
return &terminatingFn{}
}
func (f *terminatingFn) setNext(next pathFn) {
// do nothing
}
func (f *terminatingFn) call(node interface{}, ctx *queryContext) {
ctx.result.appendResult(node, ctx.lastPosition)
}
// match single key
type matchKeyFn struct {
matchBase
Name string
}
func newMatchKeyFn(name string) *matchKeyFn {
return &matchKeyFn{Name: name}
}
func (f *matchKeyFn) call(node interface{}, ctx *queryContext) {
if array, ok := node.([]*toml.Tree); ok {
for _, tree := range array {
item := tree.Get(f.Name)
if item != nil {
ctx.lastPosition = tree.GetPosition(f.Name)
f.next.call(item, ctx)
}
}
} else if tree, ok := node.(*toml.Tree); ok {
item := tree.Get(f.Name)
if item != nil {
ctx.lastPosition = tree.GetPosition(f.Name)
f.next.call(item, ctx)
}
}
}
// match single index
type matchIndexFn struct {
matchBase
Idx int
}
func newMatchIndexFn(idx int) *matchIndexFn {
return &matchIndexFn{Idx: idx}
}
func (f *matchIndexFn) call(node interface{}, ctx *queryContext) {
if arr, ok := node.([]interface{}); ok {
if f.Idx < len(arr) && f.Idx >= 0 {
if treesArray, ok := node.([]*toml.Tree); ok {
if len(treesArray) > 0 {
ctx.lastPosition = treesArray[0].Position()
}
}
f.next.call(arr[f.Idx], ctx)
}
}
}
// filter by slicing
type matchSliceFn struct {
matchBase
Start, End, Step int
}
func newMatchSliceFn(start, end, step int) *matchSliceFn {
return &matchSliceFn{Start: start, End: end, Step: step}
}
func (f *matchSliceFn) call(node interface{}, ctx *queryContext) {
if arr, ok := node.([]interface{}); ok {
// adjust indexes for negative values, reverse ordering
realStart, realEnd := f.Start, f.End
if realStart < 0 {
realStart = len(arr) + realStart
}
if realEnd < 0 {
realEnd = len(arr) + realEnd
}
if realEnd < realStart {
realEnd, realStart = realStart, realEnd // swap
}
// loop and gather
for idx := realStart; idx < realEnd; idx += f.Step {
if treesArray, ok := node.([]*toml.Tree); ok {
if len(treesArray) > 0 {
ctx.lastPosition = treesArray[0].Position()
}
}
f.next.call(arr[idx], ctx)
}
}
}
// match anything
type matchAnyFn struct {
matchBase
}
func newMatchAnyFn() *matchAnyFn {
return &matchAnyFn{}
}
func (f *matchAnyFn) call(node interface{}, ctx *queryContext) {
if tree, ok := node.(*toml.Tree); ok {
for _, k := range tree.Keys() {
v := tree.Get(k)
ctx.lastPosition = tree.GetPosition(k)
f.next.call(v, ctx)
}
}
}
// filter through union
type matchUnionFn struct {
Union []pathFn
}
func (f *matchUnionFn) setNext(next pathFn) {
for _, fn := range f.Union {
fn.setNext(next)
}
}
func (f *matchUnionFn) call(node interface{}, ctx *queryContext) {
for _, fn := range f.Union {
fn.call(node, ctx)
}
}
// match every single last node in the tree
type matchRecursiveFn struct {
matchBase
}
func newMatchRecursiveFn() *matchRecursiveFn {
return &matchRecursiveFn{}
}
func (f *matchRecursiveFn) call(node interface{}, ctx *queryContext) {
originalPosition := ctx.lastPosition
if tree, ok := node.(*toml.Tree); ok {
var visit func(tree *toml.Tree)
visit = func(tree *toml.Tree) {
for _, k := range tree.Keys() {
v := tree.Get(k)
ctx.lastPosition = tree.GetPosition(k)
f.next.call(v, ctx)
switch node := v.(type) {
case *toml.Tree:
visit(node)
case []*toml.Tree:
for _, subtree := range node {
visit(subtree)
}
}
}
}
ctx.lastPosition = originalPosition
f.next.call(tree, ctx)
visit(tree)
}
}
// match based on an externally provided functional filter
type matchFilterFn struct {
matchBase
Pos toml.Position
Name string
}
func newMatchFilterFn(name string, pos toml.Position) *matchFilterFn {
return &matchFilterFn{Name: name, Pos: pos}
}
func (f *matchFilterFn) call(node interface{}, ctx *queryContext) {
fn, ok := (*ctx.filters)[f.Name]
if !ok {
panic(fmt.Sprintf("%s: query context does not have filter '%s'",
f.Pos.String(), f.Name))
}
switch castNode := node.(type) {
case *toml.Tree:
for _, k := range castNode.Keys() {
v := castNode.Get(k)
if fn(v) {
ctx.lastPosition = castNode.GetPosition(k)
f.next.call(v, ctx)
}
}
case []*toml.Tree:
for _, v := range castNode {
if fn(v) {
if len(castNode) > 0 {
ctx.lastPosition = castNode[0].Position()
}
f.next.call(v, ctx)
}
}
case []interface{}:
for _, v := range castNode {
if fn(v) {
f.next.call(v, ctx)
}
}
}
}
|
