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Working on multi-line statements

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This commit is contained in:
Leon Mika 2024-04-13 09:25:16 +10:00
parent 82a6eac872
commit 730dc46095
8 changed files with 107 additions and 56 deletions
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29
cmdlang/ast.go
View file

@ -2,6 +2,7 @@ package cmdlang
import (
"github.com/alecthomas/participle/v2"
"github.com/alecthomas/participle/v2/lexer"
"io"
)
@ -12,8 +13,8 @@ type astLiteral struct {
type astCmdArg struct {
Literal *astLiteral `parser:"@@"`
Var *string `parser:"| '$' @Ident"`
Sub *astPipeline `parser:"| '(' @@ ')'"`
Var *string `parser:"| DOLLAR @Ident"`
Sub *astPipeline `parser:"| LP @@ RP"`
}
type astCmd struct {
@ -23,15 +24,33 @@ type astCmd struct {
type astPipeline struct {
First *astCmd `parser:"@@"`
Rest []*astCmd `parser:"( '|' @@ )*"`
Rest []*astCmd `parser:"( PIPE @@ )*"`
}
type astStatements struct {
First *astPipeline `parser:"@@"`
Rest []*astPipeline `parser:"( ';' @@ )*"` // TODO: also add support for newlines
Rest []*astPipeline `parser:"( (SEMICL | NL)+ @@ )*"` // TODO: also add support for newlines
}
var parser = participle.MustBuild[astStatements]()
type astBlock struct {
Statements *astStatements `parser:"'{' "`
}
var scanner = lexer.MustStateful(lexer.Rules{
"Root": {
{"Whitespace", `[ ]`, nil},
{"NL", `\n\s*`, nil},
{"String", `"(\\"|[^"])*"`, nil},
{"DOLLAR", `\$`, nil},
{"LP", `\(`, nil},
{"RP", `\)`, nil},
{"SEMICL", `;`, nil},
{"PIPE", `\|`, nil},
{"Ident", `\w+`, nil},
},
})
var parser = participle.MustBuild[astStatements](participle.Lexer(scanner),
participle.Elide("Whitespace"))
func parse(r io.Reader) (*astStatements, error) {
return parser.Parse("test", r)

9
cmdlang/builtins.go
View file

@ -11,7 +11,9 @@ import (
func echoBuiltin(ctx context.Context, args invocationArgs) (object, error) {
if len(args.args) == 0 {
return strObject(""), nil
if _, err := fmt.Fprintln(args.inst.Out()); err != nil {
return nil, err
}
}
var line strings.Builder
@ -21,7 +23,10 @@ func echoBuiltin(ctx context.Context, args invocationArgs) (object, error) {
}
}
return strObject(line.String()), nil
if _, err := fmt.Fprintln(args.inst.Out(), line.String()); err != nil {
return nil, err
}
return nil, nil
}
func setBuiltin(ctx context.Context, args invocationArgs) (object, error) {

8
cmdlang/env.go
View file

@ -6,18 +6,10 @@ import (
type evalCtx struct {
parent *evalCtx
currentStream stream
commands map[string]invokable
vars map[string]object
}
func (ec *evalCtx) withCurrentStream(s stream) *evalCtx {
return &evalCtx{
parent: ec,
currentStream: s,
}
}
func (ec *evalCtx) addCmd(name string, inv invokable) {
if ec.commands == nil {
ec.commands = make(map[string]invokable)

15
cmdlang/eval.go
View file

@ -10,6 +10,7 @@ import (
)
type evaluator struct {
inst *Inst
}
func (e evaluator) evalStatement(ctx context.Context, ec *evalCtx, n *astStatements) (object, error) {
@ -39,7 +40,7 @@ func (e evaluator) evalStatement(ctx context.Context, ec *evalCtx, n *astStateme
}
func (e evaluator) evalPipeline(ctx context.Context, ec *evalCtx, n *astPipeline) (object, error) {
res, err := e.evalCmd(ctx, ec, n.First)
res, err := e.evalCmd(ctx, ec, nil, n.First)
if err != nil {
return nil, err
}
@ -49,7 +50,7 @@ func (e evaluator) evalPipeline(ctx context.Context, ec *evalCtx, n *astPipeline
// Command is a pipeline, so build it out
for _, rest := range n.Rest {
out, err := e.evalCmd(ctx, ec.withCurrentStream(asStream(res)), rest)
out, err := e.evalCmd(ctx, ec, asStream(res), rest)
if err != nil {
return nil, err
}
@ -58,7 +59,7 @@ func (e evaluator) evalPipeline(ctx context.Context, ec *evalCtx, n *astPipeline
return res, nil
}
func (e evaluator) evalCmd(ctx context.Context, ec *evalCtx, ast *astCmd) (object, error) {
func (e evaluator) evalCmd(ctx context.Context, ec *evalCtx, currentStream stream, ast *astCmd) (object, error) {
cmd, err := ec.lookupCmd(ast.Name)
if err != nil {
return nil, err
@ -71,13 +72,13 @@ func (e evaluator) evalCmd(ctx context.Context, ec *evalCtx, ast *astCmd) (objec
return nil, err
}
invArgs := invocationArgs{ec: ec, args: args}
invArgs := invocationArgs{ec: ec, inst: e.inst, args: args, currentStream: currentStream}
if ec.currentStream != nil {
if currentStream != nil {
if si, ok := cmd.(streamInvokable); ok {
return si.invokeWithStream(ctx, ec.currentStream, invArgs)
return si.invokeWithStream(ctx, currentStream, invArgs)
} else {
if err := ec.currentStream.close(); err != nil {
if err := currentStream.close(); err != nil {
return nil, err
}
}

13
cmdlang/inst.go
View file

@ -47,6 +47,13 @@ func New(opts ...InstOption) *Inst {
return inst
}
func (inst *Inst) Out() io.Writer {
if inst.out == nil {
return os.Stdout
}
return inst.out
}
func (inst *Inst) Eval(ctx context.Context, expr string) (any, error) {
res, err := inst.eval(ctx, expr)
if err != nil {
@ -67,7 +74,7 @@ func (inst *Inst) eval(ctx context.Context, expr string) (object, error) {
return nil, err
}
eval := evaluator{}
eval := evaluator{inst: inst}
return eval.evalStatement(ctx, inst.rootEC, ast)
}
@ -83,6 +90,10 @@ func (inst *Inst) EvalAndDisplay(ctx context.Context, expr string) error {
func (inst *Inst) display(ctx context.Context, res object) (err error) {
switch v := res.(type) {
case nil:
if _, err = fmt.Fprintln(inst.out, "(nil)"); err != nil {
return err
}
case stream:
return forEach(v, func(o object, _ int) error { return inst.display(ctx, o) })
default:

20
cmdlang/inst_test.go
View file

@ -5,6 +5,7 @@ import (
"context"
"github.com/lmika/cmdlang-proto/cmdlang"
"github.com/stretchr/testify/assert"
"strings"
"testing"
)
@ -17,14 +18,14 @@ func TestInst_Eval(t *testing.T) {
{desc: "simple string", expr: `firstarg "hello"`, want: "hello"},
// Sub-expressions
{desc: "sub expression 1", expr: `firstarg (echo "hello")`, want: "hello"},
{desc: "sub expression 2", expr: `firstarg (echo "hello " "world")`, want: "hello world"},
{desc: "sub expression 3", expr: `firstarg (echo "hello" (echo " ") (echo "world"))`, want: "hello world"},
{desc: "sub expression 1", expr: `firstarg (sjoin "hello")`, want: "hello"},
{desc: "sub expression 2", expr: `firstarg (sjoin "hello " "world")`, want: "hello world"},
{desc: "sub expression 3", expr: `firstarg (sjoin "hello" (sjoin " ") (sjoin "world"))`, want: "hello world"},
// Variables
{desc: "var 1", expr: `firstarg $a`, want: "alpha"},
{desc: "var 2", expr: `firstarg $bee`, want: "buzz"},
{desc: "var 3", expr: `firstarg (echo $bee " " $bee " " $bee)`, want: "buzz buzz buzz"},
{desc: "var 3", expr: `firstarg (sjoin $bee " " $bee " " $bee)`, want: "buzz buzz buzz"},
// Pipeline
{desc: "pipe 1", expr: `pipe "aye" "bee" "see" | joinpipe`, want: "aye,bee,see"},
@ -37,6 +38,8 @@ func TestInst_Eval(t *testing.T) {
{desc: "multi 1", expr: `firstarg "hello" ; firstarg "world"`, want: "world"},
{desc: "multi 2", expr: `pipe "hello" | toUpper ; firstarg "world"`, want: "world"}, // TODO: assert for leaks
{desc: "multi 3", expr: `set new "this is new" ; firstarg $new`, want: "this is new"},
{desc: "multi-line 1", expr: "echo \"Hello\" \n echo \"world\"", want: "world"},
}
for _, tt := range tests {
@ -53,8 +56,7 @@ func TestInst_Eval(t *testing.T) {
}
}
func TestInst_Builtins(t *testing.T) {
t.Run("echo", func(t *testing.T) {
func TestInst_Builtins_Echo(t *testing.T) {
tests := []struct {
desc string
expr string
@ -64,6 +66,7 @@ func TestInst_Builtins(t *testing.T) {
{desc: "single arg", expr: `echo "hello"`, want: "hello\n"},
{desc: "dual args", expr: `echo "hello " "world"`, want: "hello world\n"},
{desc: "args to singleton stream", expr: `echo "aye" "bee" "see" | toUpper`, want: "AYEBEESEE\n"},
{desc: "multi-line 1", expr: joinLines(`echo "Hello"`, `echo "world"`), want: "Hello\nworld"},
}
for _, tt := range tests {
@ -78,5 +81,8 @@ func TestInst_Builtins(t *testing.T) {
assert.Equal(t, tt.want, outW.String())
})
}
})
}
func joinLines(ls ...string) string {
return strings.Join(ls, "\n")
}

1
cmdlang/objs.go
View file

@ -31,6 +31,7 @@ func toGoValue(obj object) (interface{}, bool) {
type invocationArgs struct {
inst *Inst
ec *evalCtx
currentStream stream
args []object
}

16
cmdlang/testbuiltins_test.go
View file

@ -2,6 +2,7 @@ package cmdlang
import (
"context"
"fmt"
"strings"
)
@ -12,6 +13,21 @@ func WithTestBuiltin() InstOption {
return args.args[0], nil
}))
i.rootEC.addCmd("sjoin", invokableFunc(func(ctx context.Context, args invocationArgs) (object, error) {
if len(args.args) == 0 {
return strObject(""), nil
}
var line strings.Builder
for _, arg := range args.args {
if s, ok := arg.(fmt.Stringer); ok {
line.WriteString(s.String())
}
}
return strObject(line.String()), nil
}))
i.rootEC.addCmd("pipe", invokableFunc(func(ctx context.Context, args invocationArgs) (object, error) {
return &listIterStream{
list: args.args,