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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 (
"bytes"
"fmt"
"strings"
)
type ast interface {
eval(*Evaluator)
show()
}
type astBase struct {
filename string
lineno int
}
type assignAST struct {
astBase
lhs Value
rhs Value
op string
opt string // "override", "export"
}
func (ast *assignAST) eval(ev *Evaluator) {
ev.evalAssign(ast)
}
func (ast *assignAST) evalRHS(ev *Evaluator, lhs string) Var {
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: v.String(), origin: origin}
case tmpval:
return &simpleVar{value: v.String(), origin: origin}
default:
var buf bytes.Buffer
v.Eval(&buf, ev)
return &simpleVar{value: buf.String(), origin: origin}
}
case "=":
return &recursiveVar{expr: ast.rhs, origin: origin}
case "+=":
prev := ev.LookupVarInCurrentScope(lhs)
if !prev.IsDefined() {
return &recursiveVar{expr: ast.rhs, origin: origin}
}
return prev.AppendVar(ev, ast.rhs)
case "?=":
prev := ev.LookupVarInCurrentScope(lhs)
if prev.IsDefined() {
return prev
}
return &recursiveVar{expr: ast.rhs, origin: origin}
default:
panic(fmt.Sprintf("unknown assign op: %q", ast.op))
}
}
func (ast *assignAST) show() {
Logf("%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 {
astBase
expr Value
term byte // Either ':', '=', or 0
afterTerm []byte
}
func (ast *maybeRuleAST) eval(ev *Evaluator) {
ev.evalMaybeRule(ast)
}
func (ast *maybeRuleAST) show() {
Logf("%s", ast.expr)
}
type commandAST struct {
astBase
cmd string
}
func (ast *commandAST) eval(ev *Evaluator) {
ev.evalCommand(ast)
}
func (ast *commandAST) show() {
Logf("\t%s", strings.Replace(ast.cmd, "\n", `\n`, -1))
}
type includeAST struct {
astBase
expr string
op string
}
func (ast *includeAST) eval(ev *Evaluator) {
ev.evalInclude(ast)
}
func (ast *includeAST) show() {
Logf("include %s", ast.expr)
}
type ifAST struct {
astBase
op string
lhs Value
rhs Value // Empty if |op| is ifdef or ifndef.
trueStmts []ast
falseStmts []ast
}
func (ast *ifAST) eval(ev *Evaluator) {
ev.evalIf(ast)
}
func (ast *ifAST) show() {
// TODO
Logf("if")
}
type exportAST struct {
astBase
expr []byte
export bool
}
func (ast *exportAST) eval(ev *Evaluator) {
ev.evalExport(ast)
}
func (ast *exportAST) show() {
// TODO
Logf("export")
}
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