78 lines
1.3 KiB
Go
78 lines
1.3 KiB
Go
package cmdlang
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type evalCtx struct {
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parent *evalCtx
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commands map[string]invokable
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macros map[string]macroable
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vars map[string]object
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}
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func (ec *evalCtx) fork() *evalCtx {
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return &evalCtx{parent: ec}
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}
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func (ec *evalCtx) addCmd(name string, inv invokable) {
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if ec.commands == nil {
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ec.commands = make(map[string]invokable)
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}
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ec.commands[name] = inv
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}
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func (ec *evalCtx) addMacro(name string, inv macroable) {
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if ec.macros == nil {
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ec.macros = make(map[string]macroable)
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}
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ec.macros[name] = inv
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}
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func (ec *evalCtx) setVar(name string, val object) {
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if ec.vars == nil {
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ec.vars = make(map[string]object)
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}
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ec.vars[name] = val
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}
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func (ec *evalCtx) getVar(name string) (object, bool) {
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if ec.vars == nil {
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return nil, false
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}
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if v, ok := ec.vars[name]; ok {
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return v, true
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} else if ec.parent != nil {
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return ec.parent.getVar(name)
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}
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return nil, false
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}
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func (ec *evalCtx) lookupInvokable(name string) invokable {
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if ec == nil {
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return nil
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}
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for e := ec; e != nil; e = e.parent {
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if cmd, ok := e.commands[name]; ok {
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return cmd
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}
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}
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return ec.parent.lookupInvokable(name)
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}
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func (ec *evalCtx) lookupMacro(name string) macroable {
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if ec == nil {
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return nil
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}
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for e := ec; e != nil; e = e.parent {
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if cmd, ok := e.macros[name]; ok {
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return cmd
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}
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}
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return ec.parent.lookupMacro(name)
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}
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