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// Copyright 2014 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 blueprint
import (
"errors"
"fmt"
"sort"
"strconv"
"strings"
)
// A Deps value indicates the dependency file format that Ninja should expect to
// be output by a compiler.
type Deps int
const (
DepsNone Deps = iota
DepsGCC
DepsMSVC
)
func (d Deps) String() string {
switch d {
case DepsNone:
return "none"
case DepsGCC:
return "gcc"
case DepsMSVC:
return "msvc"
default:
panic(fmt.Sprintf("unknown deps value: %d", d))
}
}
// A PoolParams object contains the set of parameters that make up a Ninja pool
// definition.
type PoolParams struct {
Comment string // The comment that will appear above the definition.
Depth int // The Ninja pool depth.
}
// A RuleParams object contains the set of parameters that make up a Ninja rule
// definition.
type RuleParams struct {
// These fields correspond to a Ninja variable of the same name.
Command string // The command that Ninja will run for the rule.
Depfile string // The dependency file name.
Deps Deps // The format of the dependency file.
Description string // The description that Ninja will print for the rule.
Generator bool // Whether the rule generates the Ninja manifest file.
Pool Pool // The Ninja pool to which the rule belongs.
Restat bool // Whether Ninja should re-stat the rule's outputs.
Rspfile string // The response file.
RspfileContent string // The response file content.
// These fields are used internally in Blueprint
CommandDeps []string // Command-specific implicit dependencies to prepend to builds
Comment string // The comment that will appear above the definition.
}
// A BuildParams object contains the set of parameters that make up a Ninja
// build statement. Each field except for Args corresponds with a part of the
// Ninja build statement. The Args field contains variable names and values
// that are set within the build statement's scope in the Ninja file.
type BuildParams struct {
Comment string // The comment that will appear above the definition.
Rule Rule // The rule to invoke.
Outputs []string // The list of output targets.
Inputs []string // The list of explicit input dependencies.
Implicits []string // The list of implicit dependencies.
OrderOnly []string // The list of order-only dependencies.
Args map[string]string // The variable/value pairs to set.
Optional bool // Skip outputting a default statement
}
// A poolDef describes a pool definition. It does not include the name of the
// pool.
type poolDef struct {
Comment string
Depth int
}
func parsePoolParams(scope scope, params *PoolParams) (*poolDef,
error) {
def := &poolDef{
Comment: params.Comment,
Depth: params.Depth,
}
return def, nil
}
func (p *poolDef) WriteTo(nw *ninjaWriter, name string) error {
if p.Comment != "" {
err := nw.Comment(p.Comment)
if err != nil {
return err
}
}
err := nw.Pool(name)
if err != nil {
return err
}
return nw.ScopedAssign("depth", strconv.Itoa(p.Depth))
}
// A ruleDef describes a rule definition. It does not include the name of the
// rule.
type ruleDef struct {
CommandDeps []*ninjaString
Comment string
Pool Pool
Variables map[string]*ninjaString
}
func parseRuleParams(scope scope, params *RuleParams) (*ruleDef,
error) {
r := &ruleDef{
Comment: params.Comment,
Pool: params.Pool,
Variables: make(map[string]*ninjaString),
}
if params.Command == "" {
return nil, fmt.Errorf("encountered rule params with no command " +
"specified")
}
if r.Pool != nil && !scope.IsPoolVisible(r.Pool) {
return nil, fmt.Errorf("Pool %s is not visible in this scope", r.Pool)
}
value, err := parseNinjaString(scope, params.Command)
if err != nil {
return nil, fmt.Errorf("error parsing Command param: %s", err)
}
r.Variables["command"] = value
if params.Depfile != "" {
value, err = parseNinjaString(scope, params.Depfile)
if err != nil {
return nil, fmt.Errorf("error parsing Depfile param: %s", err)
}
r.Variables["depfile"] = value
}
if params.Deps != DepsNone {
r.Variables["deps"] = simpleNinjaString(params.Deps.String())
}
if params.Description != "" {
value, err = parseNinjaString(scope, params.Description)
if err != nil {
return nil, fmt.Errorf("error parsing Description param: %s", err)
}
r.Variables["description"] = value
}
if params.Generator {
r.Variables["generator"] = simpleNinjaString("true")
}
if params.Restat {
r.Variables["restat"] = simpleNinjaString("true")
}
if params.Rspfile != "" {
value, err = parseNinjaString(scope, params.Rspfile)
if err != nil {
return nil, fmt.Errorf("error parsing Rspfile param: %s", err)
}
r.Variables["rspfile"] = value
}
if params.RspfileContent != "" {
value, err = parseNinjaString(scope, params.RspfileContent)
if err != nil {
return nil, fmt.Errorf("error parsing RspfileContent param: %s",
err)
}
r.Variables["rspfile_content"] = value
}
r.CommandDeps, err = parseNinjaStrings(scope, params.CommandDeps)
if err != nil {
return nil, fmt.Errorf("error parsing CommandDeps param: %s", err)
}
return r, nil
}
func (r *ruleDef) WriteTo(nw *ninjaWriter, name string,
pkgNames map[*packageContext]string) error {
if r.Comment != "" {
err := nw.Comment(r.Comment)
if err != nil {
return err
}
}
err := nw.Rule(name)
if err != nil {
return err
}
if r.Pool != nil {
err = nw.ScopedAssign("pool", r.Pool.fullName(pkgNames))
if err != nil {
return err
}
}
var keys []string
for k := range r.Variables {
keys = append(keys, k)
}
sort.Strings(keys)
for _, name := range keys {
err = nw.ScopedAssign(name, r.Variables[name].Value(pkgNames))
if err != nil {
return err
}
}
return nil
}
// A buildDef describes a build target definition.
type buildDef struct {
Comment string
Rule Rule
RuleDef *ruleDef
Outputs []*ninjaString
Inputs []*ninjaString
Implicits []*ninjaString
OrderOnly []*ninjaString
Args map[Variable]*ninjaString
Optional bool
}
func parseBuildParams(scope scope, params *BuildParams) (*buildDef,
error) {
comment := params.Comment
rule := params.Rule
b := &buildDef{
Comment: comment,
Rule: rule,
}
if !scope.IsRuleVisible(rule) {
return nil, fmt.Errorf("Rule %s is not visible in this scope", rule)
}
if len(params.Outputs) == 0 {
return nil, errors.New("Outputs param has no elements")
}
var err error
b.Outputs, err = parseNinjaStrings(scope, params.Outputs)
if err != nil {
return nil, fmt.Errorf("error parsing Outputs param: %s", err)
}
b.Inputs, err = parseNinjaStrings(scope, params.Inputs)
if err != nil {
return nil, fmt.Errorf("error parsing Inputs param: %s", err)
}
b.Implicits, err = parseNinjaStrings(scope, params.Implicits)
if err != nil {
return nil, fmt.Errorf("error parsing Implicits param: %s", err)
}
b.OrderOnly, err = parseNinjaStrings(scope, params.OrderOnly)
if err != nil {
return nil, fmt.Errorf("error parsing OrderOnly param: %s", err)
}
b.Optional = params.Optional
argNameScope := rule.scope()
if len(params.Args) > 0 {
b.Args = make(map[Variable]*ninjaString)
for name, value := range params.Args {
if !rule.isArg(name) {
return nil, fmt.Errorf("unknown argument %q", name)
}
argVar, err := argNameScope.LookupVariable(name)
if err != nil {
// This shouldn't happen.
return nil, fmt.Errorf("argument lookup error: %s", err)
}
ninjaValue, err := parseNinjaString(scope, value)
if err != nil {
return nil, fmt.Errorf("error parsing variable %q: %s", name,
err)
}
b.Args[argVar] = ninjaValue
}
}
return b, nil
}
func (b *buildDef) WriteTo(nw *ninjaWriter, pkgNames map[*packageContext]string) error {
var (
comment = b.Comment
rule = b.Rule.fullName(pkgNames)
outputs = valueList(b.Outputs, pkgNames, outputEscaper)
explicitDeps = valueList(b.Inputs, pkgNames, inputEscaper)
implicitDeps = valueList(b.Implicits, pkgNames, inputEscaper)
orderOnlyDeps = valueList(b.OrderOnly, pkgNames, inputEscaper)
)
if b.RuleDef != nil {
implicitDeps = append(valueList(b.RuleDef.CommandDeps, pkgNames, inputEscaper), implicitDeps...)
}
err := nw.Build(comment, rule, outputs, explicitDeps, implicitDeps, orderOnlyDeps)
if err != nil {
return err
}
args := make(map[string]string)
for argVar, value := range b.Args {
args[argVar.fullName(pkgNames)] = value.Value(pkgNames)
}
var keys []string
for k := range args {
keys = append(keys, k)
}
sort.Strings(keys)
for _, name := range keys {
err = nw.ScopedAssign(name, args[name])
if err != nil {
return err
}
}
if !b.Optional {
nw.Default(outputs...)
}
return nw.BlankLine()
}
func valueList(list []*ninjaString, pkgNames map[*packageContext]string,
escaper *strings.Replacer) []string {
result := make([]string, len(list))
for i, ninjaStr := range list {
result[i] = ninjaStr.ValueWithEscaper(pkgNames, escaper)
}
return result
}