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// Copyright 2015 Google Inc. All rights reserved
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kati
import (
"strings"
"github.com/golang/glog"
)
type ast interface {
eval(*Evaluator) error
show()
}
type assignAST struct {
srcpos
lhs Value
rhs Value
op string
opt string // "override", "export"
}
func (ast *assignAST) eval(ev *Evaluator) error {
return ev.evalAssign(ast)
}
func (ast *assignAST) evalRHS(ev *Evaluator, lhs string) (Var, error) {
origin := "file"
if ast.filename == bootstrapMakefileName {
origin = "default"
}
if ast.opt == "override" {
origin = "override"
}
// TODO(ukai): handle ast.opt == "export"
switch ast.op {
case ":=":
switch v := ast.rhs.(type) {
case literal:
return &simpleVar{value: []string{v.String()}, origin: origin}, nil
case tmpval:
return &simpleVar{value: []string{v.String()}, origin: origin}, nil
default:
var buf evalBuffer
buf.resetSep()
err := v.Eval(&buf, ev)
if err != nil {
return nil, err
}
return &simpleVar{value: []string{buf.String()}, origin: origin}, nil
}
case "=":
return &recursiveVar{expr: ast.rhs, origin: origin}, nil
case "+=":
prev := ev.lookupVarInCurrentScope(lhs)
if !prev.IsDefined() {
return &recursiveVar{expr: ast.rhs, origin: origin}, nil
}
return prev.AppendVar(ev, ast.rhs)
case "?=":
prev := ev.lookupVarInCurrentScope(lhs)
if prev.IsDefined() {
return prev, nil
}
return &recursiveVar{expr: ast.rhs, origin: origin}, nil
}
return nil, ast.errorf("unknown assign op: %q", ast.op)
}
func (ast *assignAST) show() {
glog.Infof("%s %s %s %q", ast.opt, ast.lhs, ast.op, ast.rhs)
}
// maybeRuleAST is an ast for rule line.
// Note we cannot be sure what this is, until all variables in |expr|
// are expanded.
type maybeRuleAST struct {
srcpos
isRule bool // found literal ':'
expr Value
assign *assignAST // target specific var
semi []byte // after ';' if ';' exists
}
func (ast *maybeRuleAST) eval(ev *Evaluator) error {
return ev.evalMaybeRule(ast)
}
func (ast *maybeRuleAST) show() {
glog.Info(ast.expr)
}
type commandAST struct {
srcpos
cmd string
}
func (ast *commandAST) eval(ev *Evaluator) error {
return ev.evalCommand(ast)
}
func (ast *commandAST) show() {
glog.Infof("\t%s", strings.Replace(ast.cmd, "\n", `\n`, -1))
}
type includeAST struct {
srcpos
expr string
op string
}
func (ast *includeAST) eval(ev *Evaluator) error {
return ev.evalInclude(ast)
}
func (ast *includeAST) show() {
glog.Infof("include %s", ast.expr)
}
type ifAST struct {
srcpos
op string
lhs Value
rhs Value // Empty if |op| is ifdef or ifndef.
trueStmts []ast
falseStmts []ast
}
func (ast *ifAST) eval(ev *Evaluator) error {
return ev.evalIf(ast)
}
func (ast *ifAST) show() {
// TODO
glog.Info("if")
}
type exportAST struct {
srcpos
expr []byte
hasEqual bool
export bool
}
func (ast *exportAST) eval(ev *Evaluator) error {
return ev.evalExport(ast)
}
func (ast *exportAST) show() {
// TODO
glog.Info("export")
}
type vpathAST struct {
srcpos
expr Value
}
func (ast *vpathAST) eval(ev *Evaluator) error {
return ev.evalVpath(ast)
}
func (ast *vpathAST) show() {
glog.Infof("vpath %s", ast.expr.String())
}
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