Completely refactor gg with new BNF file and decoder
The new gg format is based on a BNF file which can be found in the `gg` directory. The code for decoding `.gg` files has been refactored to mirror that file. The result is more resilient parsing, better errors, and a greater ability to extend the format in the future. The new decoder is notable in that it does not use a lexer. Both lexing and parsing are done in a single step. The format syntax itself has also been modified. Rather than using semi-colons everywhere, commas are used as separators in tuples. Additionally the final comma/semi-colon is no longer required.
This commit is contained in:
parent
21c91731e9
commit
360857d506
@ -19,10 +19,7 @@ func main() {
|
||||
opSrc := os.Args[1]
|
||||
inSrc := os.Args[2]
|
||||
|
||||
inVal, err := gg.DecodeSingleValueFromLexer(
|
||||
gg.NewLexer(bytes.NewBufferString(inSrc + ";")),
|
||||
)
|
||||
|
||||
inVal, err := gg.NewDecoder(bytes.NewBufferString(inSrc)).Next()
|
||||
if err != nil {
|
||||
panic(fmt.Sprintf("decoding input: %v", err))
|
||||
}
|
||||
@ -32,7 +29,6 @@ func main() {
|
||||
vm.Value{Value: inVal},
|
||||
vm.GlobalScope,
|
||||
)
|
||||
|
||||
if err != nil {
|
||||
panic(fmt.Sprintf("evaluating: %v", err))
|
||||
}
|
||||
|
||||
@ -1,19 +1,24 @@
|
||||
out = {
|
||||
* A function which accepts a number N and returns the Nth fibonacci number
|
||||
{
|
||||
* We are passing a tuple of inputs into a graph here, such that the graph is
|
||||
* evaluated as an anonymous function. That anonymous function uses recur
|
||||
* internally to compute the result.
|
||||
out = {
|
||||
|
||||
decr = { out = add < (in; -1;); };
|
||||
* A little helper function.
|
||||
decr = { out = add < (in, -1) };
|
||||
|
||||
n = tupEl < (in; 0;);
|
||||
a = tupEl < (in; 1;);
|
||||
b = tupEl < (in; 2;);
|
||||
* Deconstruct the input tuple into its individual elements, for clarity.
|
||||
* There will be a more ergonomic way of doing this one day.
|
||||
n = tupEl < (in, 0);
|
||||
a = tupEl < (in, 1);
|
||||
b = tupEl < (in, 2);
|
||||
|
||||
out = if < (
|
||||
isZero < n;
|
||||
a;
|
||||
recur < (
|
||||
decr < n;
|
||||
b;
|
||||
add < (a;b;);
|
||||
out = if < (
|
||||
isZero < n,
|
||||
a,
|
||||
recur < ( decr<n, b, add<(a,b) ),
|
||||
);
|
||||
);
|
||||
|
||||
} < (in; 0; 1;);
|
||||
} < (in, 0, 1);
|
||||
}
|
||||
|
||||
362
gg/decoder.go
362
gg/decoder.go
@ -1,353 +1,73 @@
|
||||
package gg
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"bufio"
|
||||
"fmt"
|
||||
"io"
|
||||
"strconv"
|
||||
|
||||
"github.com/mediocregopher/ginger/graph"
|
||||
)
|
||||
|
||||
// Type aliases for convenience
|
||||
type (
|
||||
Graph = graph.Graph[Value, Value]
|
||||
OpenEdge = graph.OpenEdge[Value, Value]
|
||||
)
|
||||
// Decoder reads Value's off of a byte stream.
|
||||
type Decoder struct {
|
||||
br *bufio.Reader
|
||||
brNextLoc Location
|
||||
|
||||
// Punctuations which are used in the gg file format.
|
||||
const (
|
||||
punctTerm = ";"
|
||||
punctOp = "<"
|
||||
punctAssign = "="
|
||||
punctOpenGraph = "{"
|
||||
punctCloseGraph = "}"
|
||||
punctOpenTuple = "("
|
||||
punctCloseTuple = ")"
|
||||
)
|
||||
|
||||
func decoderErr(tok LexerToken, err error) error {
|
||||
return fmt.Errorf("%s: %w", tok.errPrefix(), err)
|
||||
unread []locatableRune
|
||||
lastRead locatableRune
|
||||
}
|
||||
|
||||
func decoderErrf(tok LexerToken, str string, args ...interface{}) error {
|
||||
return decoderErr(tok, fmt.Errorf(str, args...))
|
||||
}
|
||||
|
||||
func isPunct(tok LexerToken, val string) bool {
|
||||
return tok.Kind == LexerTokenKindPunctuation && tok.Value == val
|
||||
}
|
||||
|
||||
func isTerm(tok LexerToken) bool {
|
||||
return isPunct(tok, punctTerm)
|
||||
}
|
||||
|
||||
// decoder is currently only really used to namespace functions related to
|
||||
// decoding Graphs. It may later have actual fields added to it, such as for
|
||||
// options passed by the caller.
|
||||
type decoder struct{}
|
||||
|
||||
// returned boolean value indicates if the token following the single token is a
|
||||
// term. If a term followed the first token then it is not included in the
|
||||
// returned leftover tokens.
|
||||
//
|
||||
// if termed is false then leftover tokens cannot be empty.
|
||||
func (d *decoder) parseSingleValue(
|
||||
toks []LexerToken,
|
||||
) (
|
||||
Value, []LexerToken, bool, error,
|
||||
) {
|
||||
|
||||
tok, rest := toks[0], toks[1:]
|
||||
|
||||
if len(rest) == 0 {
|
||||
return ZeroValue, nil, false, decoderErrf(tok, "cannot be final token, possibly missing %q", punctTerm)
|
||||
}
|
||||
|
||||
termed := isTerm(rest[0])
|
||||
|
||||
if termed {
|
||||
rest = rest[1:]
|
||||
}
|
||||
|
||||
switch tok.Kind {
|
||||
|
||||
case LexerTokenKindName:
|
||||
return Value{Name: &tok.Value, LexerToken: &tok}, rest, termed, nil
|
||||
|
||||
case LexerTokenKindNumber:
|
||||
|
||||
i, err := strconv.ParseInt(tok.Value, 10, 64)
|
||||
|
||||
if err != nil {
|
||||
return ZeroValue, nil, false, decoderErrf(tok, "parsing %q as integer: %w", tok.Value, err)
|
||||
}
|
||||
|
||||
return Value{Number: &i, LexerToken: &tok}, rest, termed, nil
|
||||
|
||||
case LexerTokenKindPunctuation:
|
||||
return ZeroValue, nil, false, decoderErrf(tok, "expected value, found punctuation %q", tok.Value)
|
||||
|
||||
default:
|
||||
panic(fmt.Sprintf("unexpected token kind %q", tok.Kind))
|
||||
// NewDecoder returns a Decoder which will decode the given stream as a gg
|
||||
// formatted stream of a Values.
|
||||
func NewDecoder(r io.Reader) *Decoder {
|
||||
return &Decoder{
|
||||
br: bufio.NewReader(r),
|
||||
brNextLoc: Location{Row: 1, Col: 1},
|
||||
}
|
||||
}
|
||||
|
||||
func (d *decoder) parseOpenEdge(
|
||||
toks []LexerToken,
|
||||
) (
|
||||
*OpenEdge, []LexerToken, error,
|
||||
) {
|
||||
|
||||
if isPunct(toks[0], punctOpenTuple) {
|
||||
return d.parseTuple(toks)
|
||||
func (d *Decoder) readRune() (locatableRune, error) {
|
||||
if len(d.unread) > 0 {
|
||||
d.lastRead = d.unread[len(d.unread)-1]
|
||||
d.unread = d.unread[:len(d.unread)-1]
|
||||
return d.lastRead, nil
|
||||
}
|
||||
|
||||
var (
|
||||
val Value
|
||||
termed bool
|
||||
err error
|
||||
)
|
||||
|
||||
switch {
|
||||
|
||||
case isPunct(toks[0], punctOpenGraph):
|
||||
val, toks, termed, err = d.parseGraphValue(toks, true)
|
||||
|
||||
default:
|
||||
val, toks, termed, err = d.parseSingleValue(toks)
|
||||
}
|
||||
loc := d.brNextLoc
|
||||
|
||||
r, _, err := d.br.ReadRune()
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
|
||||
return d.lastRead, err
|
||||
}
|
||||
|
||||
if termed {
|
||||
return graph.ValueOut[Value](ZeroValue, val), toks, nil
|
||||
if r == '\n' {
|
||||
d.brNextLoc.Row++
|
||||
d.brNextLoc.Col = 1
|
||||
} else {
|
||||
d.brNextLoc.Col++
|
||||
}
|
||||
|
||||
opTok, toks := toks[0], toks[1:]
|
||||
|
||||
if !isPunct(opTok, punctOp) {
|
||||
return nil, nil, decoderErrf(opTok, "must be %q or %q", punctOp, punctTerm)
|
||||
}
|
||||
|
||||
if len(toks) == 0 {
|
||||
return nil, nil, decoderErrf(opTok, "%q cannot terminate an edge declaration", punctOp)
|
||||
}
|
||||
|
||||
oe, toks, err := d.parseOpenEdge(toks)
|
||||
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
oe = graph.TupleOut[Value](val, oe)
|
||||
|
||||
return oe, toks, nil
|
||||
d.lastRead = locatableRune{loc, r}
|
||||
return d.lastRead, nil
|
||||
}
|
||||
|
||||
func (d *decoder) parseTuple(
|
||||
toks []LexerToken,
|
||||
) (
|
||||
*OpenEdge, []LexerToken, error,
|
||||
) {
|
||||
|
||||
openTok, toks := toks[0], toks[1:]
|
||||
|
||||
var edges []*OpenEdge
|
||||
|
||||
for {
|
||||
|
||||
if len(toks) == 0 {
|
||||
return nil, nil, decoderErrf(openTok, "no matching %q", punctCloseTuple)
|
||||
|
||||
} else if isPunct(toks[0], punctCloseTuple) {
|
||||
toks = toks[1:]
|
||||
break
|
||||
}
|
||||
|
||||
var (
|
||||
oe *OpenEdge
|
||||
err error
|
||||
)
|
||||
|
||||
oe, toks, err = d.parseOpenEdge(toks)
|
||||
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
edges = append(edges, oe)
|
||||
func (d *Decoder) unreadRune(lr locatableRune) {
|
||||
if d.lastRead != lr {
|
||||
panic(fmt.Sprintf(
|
||||
"unreading rune %#v, but last read rune was %#v", lr, d.lastRead,
|
||||
))
|
||||
}
|
||||
|
||||
// this is a quirk of the syntax, _technically_ a tuple doesn't need a
|
||||
// term after it, since it can't be used as an edge value, and so
|
||||
// nothing can come after it in the chain.
|
||||
if len(toks) > 0 && isTerm(toks[0]) {
|
||||
toks = toks[1:]
|
||||
}
|
||||
|
||||
return graph.TupleOut[Value](ZeroValue, edges...), toks, nil
|
||||
d.unread = append(d.unread, lr)
|
||||
}
|
||||
|
||||
// returned boolean value indicates if the token following the graph is a term.
|
||||
// If a term followed the first token then it is not included in the returned
|
||||
// leftover tokens.
|
||||
//
|
||||
// if termed is false then leftover tokens cannot be empty.
|
||||
func (d *decoder) parseGraphValue(
|
||||
toks []LexerToken, expectWrappers bool,
|
||||
) (
|
||||
Value, []LexerToken, bool, error,
|
||||
) {
|
||||
|
||||
var openTok LexerToken
|
||||
|
||||
if expectWrappers {
|
||||
openTok, toks = toks[0], toks[1:]
|
||||
func (d *Decoder) nextLoc() Location {
|
||||
if len(d.unread) > 0 {
|
||||
return d.unread[len(d.unread)-1].Location
|
||||
}
|
||||
|
||||
g := new(Graph)
|
||||
|
||||
for {
|
||||
|
||||
if len(toks) == 0 {
|
||||
|
||||
if !expectWrappers {
|
||||
break
|
||||
}
|
||||
|
||||
return ZeroValue, nil, false, decoderErrf(openTok, "no matching %q", punctCloseGraph)
|
||||
|
||||
} else if closingTok := toks[0]; isPunct(closingTok, punctCloseGraph) {
|
||||
|
||||
if !expectWrappers {
|
||||
return ZeroValue, nil, false, decoderErrf(closingTok, "unexpected %q", punctCloseGraph)
|
||||
}
|
||||
|
||||
toks = toks[1:]
|
||||
|
||||
if len(toks) == 0 {
|
||||
return ZeroValue, nil, false, decoderErrf(closingTok, "cannot be final token, possibly missing %q", punctTerm)
|
||||
}
|
||||
|
||||
break
|
||||
}
|
||||
|
||||
var err error
|
||||
|
||||
if g, toks, err = d.parseValIn(g, toks); err != nil {
|
||||
return ZeroValue, nil, false, err
|
||||
}
|
||||
}
|
||||
|
||||
val := Value{Graph: g}
|
||||
|
||||
if !expectWrappers {
|
||||
return val, toks, true, nil
|
||||
}
|
||||
|
||||
val.LexerToken = &openTok
|
||||
|
||||
termed := isTerm(toks[0])
|
||||
|
||||
if termed {
|
||||
toks = toks[1:]
|
||||
}
|
||||
|
||||
return val, toks, termed, nil
|
||||
return d.brNextLoc
|
||||
}
|
||||
|
||||
func (d *decoder) parseValIn(into *Graph, toks []LexerToken) (*Graph, []LexerToken, error) {
|
||||
|
||||
if len(toks) == 0 {
|
||||
return into, nil, nil
|
||||
|
||||
} else if len(toks) < 3 {
|
||||
return nil, nil, decoderErrf(toks[0], `must be of the form "<name> = ..."`)
|
||||
}
|
||||
|
||||
dst := toks[0]
|
||||
eq := toks[1]
|
||||
toks = toks[2:]
|
||||
|
||||
if dst.Kind != LexerTokenKindName {
|
||||
return nil, nil, decoderErrf(dst, "must be a name")
|
||||
|
||||
} else if !isPunct(eq, punctAssign) {
|
||||
return nil, nil, decoderErrf(eq, "must be %q", punctAssign)
|
||||
}
|
||||
|
||||
oe, toks, err := d.parseOpenEdge(toks)
|
||||
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
dstVal := Value{Name: &dst.Value, LexerToken: &dst}
|
||||
|
||||
return into.AddValueIn(dstVal, oe), toks, nil
|
||||
}
|
||||
|
||||
func (d *decoder) readAllTokens(lexer Lexer) ([]LexerToken, error) {
|
||||
|
||||
var toks []LexerToken
|
||||
|
||||
for {
|
||||
|
||||
tok, err := lexer.Next()
|
||||
|
||||
if errors.Is(err, io.EOF) {
|
||||
break
|
||||
|
||||
} else if err != nil {
|
||||
return nil, fmt.Errorf("reading next token: %w", err)
|
||||
}
|
||||
|
||||
toks = append(toks, tok)
|
||||
}
|
||||
|
||||
return toks, nil
|
||||
}
|
||||
|
||||
func (d *decoder) decode(lexer Lexer) (*Graph, error) {
|
||||
|
||||
toks, err := d.readAllTokens(lexer)
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
val, _, _, err := d.parseGraphValue(toks, false)
|
||||
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
return val.Graph, nil
|
||||
}
|
||||
|
||||
// DecodeLexer reads lexigraphical tokens from the given Lexer and uses them to
|
||||
// construct a Graph according to the rules of the gg file format. DecodeLexer
|
||||
// will only return an error if there is a non-EOF file returned from the Lexer,
|
||||
// or the tokens read cannot be used to construct a valid Graph.
|
||||
func DecodeLexer(lexer Lexer) (*Graph, error) {
|
||||
decoder := &decoder{}
|
||||
return decoder.decode(lexer)
|
||||
}
|
||||
|
||||
func DecodeSingleValueFromLexer(lexer Lexer) (Value, error) {
|
||||
decoder := &decoder{}
|
||||
|
||||
toks, err := decoder.readAllTokens(lexer)
|
||||
|
||||
if err != nil {
|
||||
return ZeroValue, err
|
||||
}
|
||||
|
||||
val, _, _, err := decoder.parseSingleValue(toks)
|
||||
|
||||
return val, err
|
||||
// Next returns the next top-level value in the stream, or io.EOF.
|
||||
func (d *Decoder) Next() (Value, error) {
|
||||
return topLevelTerm.decodeFn(d)
|
||||
}
|
||||
|
||||
@ -1,149 +0,0 @@
|
||||
package gg
|
||||
|
||||
import (
|
||||
"strconv"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/assert"
|
||||
|
||||
"github.com/mediocregopher/ginger/graph"
|
||||
)
|
||||
|
||||
func TestDecoder(t *testing.T) {
|
||||
|
||||
zeroGraph := new(Graph)
|
||||
|
||||
i := func(i int64) Value {
|
||||
return Value{Number: &i}
|
||||
}
|
||||
|
||||
n := func(n string) Value {
|
||||
return Value{Name: &n}
|
||||
}
|
||||
|
||||
vOut := func(edgeVal, val Value) *OpenEdge {
|
||||
return graph.ValueOut(edgeVal, val)
|
||||
}
|
||||
|
||||
tOut := func(edgeVal Value, ins ...*OpenEdge) *OpenEdge {
|
||||
return graph.TupleOut(edgeVal, ins...)
|
||||
}
|
||||
|
||||
tests := []struct {
|
||||
in string
|
||||
exp *Graph
|
||||
}{
|
||||
{
|
||||
in: "",
|
||||
exp: zeroGraph,
|
||||
},
|
||||
{
|
||||
in: "out = 1;",
|
||||
exp: zeroGraph.AddValueIn(n("out"), vOut(ZeroValue, i(1))),
|
||||
},
|
||||
{
|
||||
in: "out = incr < 1;",
|
||||
exp: zeroGraph.AddValueIn(n("out"), vOut(n("incr"), i(1))),
|
||||
},
|
||||
{
|
||||
in: "out = a < b < 1;",
|
||||
exp: zeroGraph.AddValueIn(
|
||||
n("out"),
|
||||
tOut(
|
||||
n("a"),
|
||||
vOut(n("b"),
|
||||
i(1)),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: "out = a < b < (1; c < 2; d < e < 3;);",
|
||||
exp: zeroGraph.AddValueIn(
|
||||
n("out"),
|
||||
tOut(
|
||||
n("a"),
|
||||
tOut(
|
||||
n("b"),
|
||||
vOut(ZeroValue, i(1)),
|
||||
vOut(n("c"), i(2)),
|
||||
tOut(
|
||||
n("d"),
|
||||
vOut(n("e"), i(3)),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: "out = a < b < (1; c < (d < 2; 3;); );",
|
||||
exp: zeroGraph.AddValueIn(
|
||||
n("out"),
|
||||
tOut(
|
||||
n("a"),
|
||||
tOut(
|
||||
n("b"),
|
||||
vOut(ZeroValue, i(1)),
|
||||
tOut(
|
||||
n("c"),
|
||||
vOut(n("d"), i(2)),
|
||||
vOut(ZeroValue, i(3)),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: "out = { a = 1; b = c < d < 2; };",
|
||||
exp: zeroGraph.AddValueIn(
|
||||
n("out"),
|
||||
vOut(
|
||||
ZeroValue,
|
||||
Value{Graph: zeroGraph.
|
||||
AddValueIn(n("a"), vOut(ZeroValue, i(1))).
|
||||
AddValueIn(
|
||||
n("b"),
|
||||
tOut(
|
||||
n("c"),
|
||||
vOut(n("d"), i(2)),
|
||||
),
|
||||
),
|
||||
},
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: "out = a < { b = 1; } < 2;",
|
||||
exp: zeroGraph.AddValueIn(
|
||||
n("out"),
|
||||
tOut(
|
||||
n("a"),
|
||||
vOut(
|
||||
Value{Graph: zeroGraph.
|
||||
AddValueIn(n("b"), vOut(ZeroValue, i(1))),
|
||||
},
|
||||
i(2),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: "a = 1; b = 2;",
|
||||
exp: zeroGraph.
|
||||
AddValueIn(n("a"), vOut(ZeroValue, i(1))).
|
||||
AddValueIn(n("b"), vOut(ZeroValue, i(2))),
|
||||
},
|
||||
}
|
||||
|
||||
for i, test := range tests {
|
||||
t.Run(strconv.Itoa(i), func(t *testing.T) {
|
||||
|
||||
r := &mockReader{body: []byte(test.in)}
|
||||
lexer := NewLexer(r)
|
||||
|
||||
got, err := DecodeLexer(lexer)
|
||||
assert.NoError(t, err)
|
||||
assert.True(t, got.Equal(test.exp), "\nexp:%v\ngot:%v", test.exp, got)
|
||||
|
||||
})
|
||||
}
|
||||
}
|
||||
23
gg/gg.bnf
Normal file
23
gg/gg.bnf
Normal file
@ -0,0 +1,23 @@
|
||||
<digit> ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
|
||||
<positive-number> ::= <digit>+
|
||||
<negative-number> ::= "-" <positive-number>
|
||||
<number> ::= <negative-number> | <positive-number>
|
||||
|
||||
<name> ::= (<letter> | <mark>) (<letter> | <mark> | <digit>)*
|
||||
|
||||
<tuple> ::= "(" <tuple-tail>
|
||||
<tuple-tail> ::= ")" | <tuple-open-edge>
|
||||
<tuple-open-edge> ::= <value> <tuple-open-edge-value-tail>
|
||||
| <tuple> <tuple-open-edge-tail>
|
||||
<tuple-open-edge-tail> ::= ")" | "," <tuple-tail>
|
||||
<tuple-open-edge-value-tail> ::= <tuple-open-edge-tail> | "<" <tuple-open-edge>
|
||||
|
||||
<graph> ::= "{" <graph-tail>
|
||||
<graph-tail> ::= "}" | <name> "=" <graph-open-edge>
|
||||
<graph-open-edge> ::= <value> <graph-open-edge-value-tail>
|
||||
| <tuple> <graph-open-edge-tail>
|
||||
<graph-open-edge-tail> ::= "}" | ";" <graph-tail>
|
||||
<graph-open-edge-value-tail> ::= <graph-open-edge-tail> | "<" <graph-open-edge>
|
||||
|
||||
<value> ::= <name> | <number> | <graph>
|
||||
<gg> ::= <eof> | <value> <gg>
|
||||
68
gg/gg.go
68
gg/gg.go
@ -7,23 +7,20 @@ import (
|
||||
"github.com/mediocregopher/ginger/graph"
|
||||
)
|
||||
|
||||
// ZeroValue is a Value with no fields set.
|
||||
var ZeroValue Value
|
||||
// Type aliases for convenience
|
||||
type (
|
||||
Graph = graph.Graph[OptionalValue, Value]
|
||||
OpenEdge = graph.OpenEdge[OptionalValue, Value]
|
||||
)
|
||||
|
||||
// Value represents a value which can be serialized by the gg text format.
|
||||
type Value struct {
|
||||
Location
|
||||
|
||||
// Only one of these fields may be set
|
||||
Name *string
|
||||
Number *int64
|
||||
Graph *Graph
|
||||
|
||||
// TODO coming soon!
|
||||
// String *string
|
||||
|
||||
// Optional fields indicating the token which was used to construct this
|
||||
// Value, if any.
|
||||
LexerToken *LexerToken
|
||||
}
|
||||
|
||||
// Name returns a name Value.
|
||||
@ -36,12 +33,6 @@ func Number(n int64) Value {
|
||||
return Value{Number: &n}
|
||||
}
|
||||
|
||||
// IsZero returns true if the Value is the zero value (none of the sub-value
|
||||
// fields are set). LexerToken is ignored for this check.
|
||||
func (v Value) IsZero() bool {
|
||||
return v.Equal(ZeroValue)
|
||||
}
|
||||
|
||||
// Equal returns true if the passed in Value is equivalent, ignoring the
|
||||
// LexerToken on either Value.
|
||||
//
|
||||
@ -50,13 +41,8 @@ func (v Value) Equal(v2g graph.Value) bool {
|
||||
|
||||
v2 := v2g.(Value)
|
||||
|
||||
v.LexerToken, v2.LexerToken = nil, nil
|
||||
|
||||
switch {
|
||||
|
||||
case v == ZeroValue && v2 == ZeroValue:
|
||||
return true
|
||||
|
||||
case v.Name != nil && v2.Name != nil && *v.Name == *v2.Name:
|
||||
return true
|
||||
|
||||
@ -85,6 +71,46 @@ func (v Value) String() string {
|
||||
return v.Graph.String()
|
||||
|
||||
default:
|
||||
return "<zero>"
|
||||
panic("no fields set on Value")
|
||||
}
|
||||
}
|
||||
|
||||
// OptionalValue is a Value which may be unset. This is used for edge values,
|
||||
// since edges might not have a value.
|
||||
type OptionalValue struct {
|
||||
Value
|
||||
Valid bool
|
||||
}
|
||||
|
||||
// None is the zero OptionalValue (hello rustaceans).
|
||||
var None OptionalValue
|
||||
|
||||
// Some wraps a Value to be an OptionalValue.
|
||||
func Some(v Value) OptionalValue {
|
||||
return OptionalValue{Valid: true, Value: v}
|
||||
}
|
||||
|
||||
func (v OptionalValue) String() string {
|
||||
if !v.Valid {
|
||||
return "<none>"
|
||||
}
|
||||
return v.Value.String()
|
||||
}
|
||||
|
||||
func (v OptionalValue) Equal(v2g graph.Value) bool {
|
||||
var v2 OptionalValue
|
||||
|
||||
if v2Val, ok := v2g.(Value); ok {
|
||||
v2 = Some(v2Val)
|
||||
} else {
|
||||
v2 = v2g.(OptionalValue)
|
||||
}
|
||||
|
||||
if v.Valid != v2.Valid {
|
||||
return false
|
||||
} else if !v.Valid {
|
||||
return true
|
||||
}
|
||||
|
||||
return v.Value.Equal(v2.Value)
|
||||
}
|
||||
|
||||
292
gg/lexer.go
292
gg/lexer.go
@ -1,292 +0,0 @@
|
||||
package gg
|
||||
|
||||
import (
|
||||
"bufio"
|
||||
"fmt"
|
||||
"io"
|
||||
"strings"
|
||||
"unicode"
|
||||
)
|
||||
|
||||
// LexerLocation describes the location in a file where a particular token was
|
||||
// parsed from.
|
||||
type LexerLocation struct {
|
||||
Row, Col int
|
||||
}
|
||||
|
||||
func (l LexerLocation) String() string {
|
||||
return fmt.Sprintf("%d:%d", l.Row, l.Col)
|
||||
}
|
||||
|
||||
// LexerError is returned by Lexer when an unexpected error occurs parsing a
|
||||
// stream of LexerTokens.
|
||||
type LexerError struct {
|
||||
Err error
|
||||
|
||||
Location LexerLocation
|
||||
}
|
||||
|
||||
func (e *LexerError) Error() string {
|
||||
return fmt.Sprintf("%s: %s", e.Location.String(), e.Err.Error())
|
||||
}
|
||||
|
||||
func (e *LexerError) Unwrap() error {
|
||||
return e.Err
|
||||
}
|
||||
|
||||
// LexerTokenKind enumerates the different kinds of LexerToken there can be.
|
||||
type LexerTokenKind string
|
||||
|
||||
// Enumeration of LexerTokenKinds.
|
||||
const (
|
||||
LexerTokenKindName LexerTokenKind = "name"
|
||||
LexerTokenKindNumber LexerTokenKind = "number"
|
||||
LexerTokenKindPunctuation LexerTokenKind = "punctuation"
|
||||
)
|
||||
|
||||
// LexerToken describes a lexigraphical token which is used when deserializing
|
||||
// Graphs.
|
||||
type LexerToken struct {
|
||||
Kind LexerTokenKind
|
||||
Value string // never empty string
|
||||
|
||||
Location LexerLocation
|
||||
}
|
||||
|
||||
func (t LexerToken) errPrefix() string {
|
||||
return fmt.Sprintf("%s: at %q", t.Location.String(), t.Value)
|
||||
}
|
||||
|
||||
// Lexer is used to parse a string stream into a sequence of tokens which can
|
||||
// then be parsed by a Parser.
|
||||
type Lexer interface {
|
||||
|
||||
// Next will return a LexerToken or a LexerError. io.EOF (wrapped in a
|
||||
// LexerError) is returned if the stream being read from is finished.
|
||||
Next() (LexerToken, error)
|
||||
}
|
||||
|
||||
type lexer struct {
|
||||
r *bufio.Reader
|
||||
stringBuilder *strings.Builder
|
||||
err *LexerError
|
||||
|
||||
// these fields are only needed to keep track of the current "cursor"
|
||||
// position when reading.
|
||||
lastRow, lastCol int
|
||||
prevRune rune
|
||||
}
|
||||
|
||||
// NewLexer wraps the io.Reader in a Lexer, which will read the io.Reader as a
|
||||
// sequence of utf-8 characters and parse it into a sequence of LexerTokens.
|
||||
func NewLexer(r io.Reader) Lexer {
|
||||
return &lexer{
|
||||
r: bufio.NewReader(r),
|
||||
lastRow: 0,
|
||||
lastCol: -1,
|
||||
stringBuilder: new(strings.Builder),
|
||||
}
|
||||
}
|
||||
|
||||
// nextRowCol returns the row and column number which the next rune in the
|
||||
// stream would be at.
|
||||
func (l *lexer) nextRowCol() (int, int) {
|
||||
|
||||
if l.prevRune == '\n' {
|
||||
return l.lastRow + 1, 0
|
||||
}
|
||||
|
||||
return l.lastRow, l.lastCol + 1
|
||||
}
|
||||
|
||||
func (l *lexer) fmtErr(err error) *LexerError {
|
||||
|
||||
row, col := l.nextRowCol()
|
||||
|
||||
return &LexerError{
|
||||
Err: err,
|
||||
Location: LexerLocation{
|
||||
Row: row,
|
||||
Col: col,
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func (l *lexer) fmtErrf(str string, args ...interface{}) *LexerError {
|
||||
return l.fmtErr(fmt.Errorf(str, args...))
|
||||
}
|
||||
|
||||
// discardRune must _always_ be called only after peekRune.
|
||||
func (l *lexer) discardRune() {
|
||||
|
||||
r, _, err := l.r.ReadRune()
|
||||
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
|
||||
l.lastRow, l.lastCol = l.nextRowCol()
|
||||
l.prevRune = r
|
||||
}
|
||||
|
||||
func (l *lexer) peekRune() (rune, error) {
|
||||
|
||||
r, _, err := l.r.ReadRune()
|
||||
|
||||
if err != nil {
|
||||
return '0', err
|
||||
|
||||
} else if err := l.r.UnreadRune(); err != nil {
|
||||
|
||||
// since the most recent operation on the bufio.Reader was a ReadRune,
|
||||
// UnreadRune should never return an error
|
||||
panic(err)
|
||||
}
|
||||
|
||||
return r, nil
|
||||
}
|
||||
|
||||
// readWhile reads runes until the given predicate returns false, and returns a
|
||||
// LexerToken of the given kind whose Value is comprised of all runes which
|
||||
// returned true.
|
||||
//
|
||||
// If an error is encountered then both the token (or what's been parsed of it
|
||||
// so far) and the error are returned.
|
||||
func (l *lexer) readWhile(
|
||||
kind LexerTokenKind, pred func(rune) bool,
|
||||
) (
|
||||
LexerToken, *LexerError,
|
||||
) {
|
||||
|
||||
row, col := l.nextRowCol()
|
||||
|
||||
l.stringBuilder.Reset()
|
||||
|
||||
var lexErr *LexerError
|
||||
|
||||
for {
|
||||
|
||||
r, err := l.peekRune()
|
||||
|
||||
if err != nil {
|
||||
lexErr = l.fmtErrf("peeking next character: %w", err)
|
||||
break
|
||||
|
||||
} else if !pred(r) {
|
||||
break
|
||||
}
|
||||
|
||||
l.stringBuilder.WriteRune(r)
|
||||
|
||||
l.discardRune()
|
||||
}
|
||||
|
||||
return LexerToken{
|
||||
Kind: kind,
|
||||
Value: l.stringBuilder.String(),
|
||||
Location: LexerLocation{
|
||||
Row: row, Col: col,
|
||||
},
|
||||
}, lexErr
|
||||
}
|
||||
|
||||
// we only support base-10 integers at the moment.
|
||||
func isNumber(r rune) bool {
|
||||
return r == '-' || ('0' <= r && r <= '9')
|
||||
}
|
||||
|
||||
// next can return a token, an error, or both. If an error is returned then no
|
||||
// further calls to next should occur.
|
||||
func (l *lexer) next() (LexerToken, *LexerError) {
|
||||
|
||||
for {
|
||||
|
||||
r, err := l.peekRune()
|
||||
|
||||
if err != nil {
|
||||
return LexerToken{}, l.fmtErrf("peeking next character: %w", err)
|
||||
}
|
||||
|
||||
switch {
|
||||
|
||||
case r == '*': // comment
|
||||
|
||||
// comments are everything up until a newline
|
||||
_, err := l.readWhile("", func(r rune) bool {
|
||||
return r != '\n'
|
||||
})
|
||||
|
||||
if err != nil {
|
||||
return LexerToken{}, err
|
||||
}
|
||||
|
||||
// terminating newline will be discarded on next loop
|
||||
|
||||
case r == '"' || r == '`':
|
||||
|
||||
// reserve double-quote and backtick for string parsing.
|
||||
l.discardRune()
|
||||
return LexerToken{}, l.fmtErrf("string parsing not yet implemented")
|
||||
|
||||
case unicode.IsLetter(r):
|
||||
// letters denote the start of a name
|
||||
|
||||
return l.readWhile(LexerTokenKindName, func(r rune) bool {
|
||||
|
||||
if unicode.In(r, unicode.Letter, unicode.Number, unicode.Mark) {
|
||||
return true
|
||||
}
|
||||
|
||||
if r == '-' {
|
||||
return true
|
||||
}
|
||||
|
||||
return false
|
||||
})
|
||||
|
||||
case isNumber(r):
|
||||
return l.readWhile(LexerTokenKindNumber, isNumber)
|
||||
|
||||
case unicode.IsPunct(r) || unicode.IsSymbol(r):
|
||||
// symbols are also considered punctuation
|
||||
|
||||
l.discardRune()
|
||||
|
||||
return LexerToken{
|
||||
Kind: LexerTokenKindPunctuation,
|
||||
Value: string(r),
|
||||
Location: LexerLocation{
|
||||
Row: l.lastRow,
|
||||
Col: l.lastCol,
|
||||
},
|
||||
}, nil
|
||||
|
||||
case unicode.IsSpace(r):
|
||||
l.discardRune()
|
||||
|
||||
default:
|
||||
return LexerToken{}, l.fmtErrf("unexpected character %q", r)
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
func (l *lexer) Next() (LexerToken, error) {
|
||||
|
||||
if l.err != nil {
|
||||
return LexerToken{}, l.err
|
||||
}
|
||||
|
||||
tok, err := l.next()
|
||||
|
||||
if err != nil {
|
||||
|
||||
l.err = err
|
||||
|
||||
if tok.Kind == "" {
|
||||
return LexerToken{}, l.err
|
||||
}
|
||||
}
|
||||
|
||||
return tok, nil
|
||||
}
|
||||
150
gg/lexer_test.go
150
gg/lexer_test.go
@ -1,150 +0,0 @@
|
||||
package gg
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"strconv"
|
||||
"strings"
|
||||
"testing"
|
||||
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
func TestLexer(t *testing.T) {
|
||||
|
||||
expErr := errors.New("eof")
|
||||
|
||||
tests := []struct {
|
||||
in string
|
||||
exp []LexerToken
|
||||
}{
|
||||
{in: "", exp: []LexerToken{}},
|
||||
{in: "* fooo\n", exp: []LexerToken{}},
|
||||
{
|
||||
in: "foo",
|
||||
exp: []LexerToken{
|
||||
{
|
||||
Kind: LexerTokenKindName,
|
||||
Value: "foo",
|
||||
Location: LexerLocation{Row: 0, Col: 0},
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
in: "foo bar\nf-o f0O Foo",
|
||||
exp: []LexerToken{
|
||||
{
|
||||
Kind: LexerTokenKindName,
|
||||
Value: "foo",
|
||||
Location: LexerLocation{Row: 0, Col: 0},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindName,
|
||||
Value: "bar",
|
||||
Location: LexerLocation{Row: 0, Col: 4},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindName,
|
||||
Value: "f-o",
|
||||
Location: LexerLocation{Row: 1, Col: 0},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindName,
|
||||
Value: "f0O",
|
||||
Location: LexerLocation{Row: 1, Col: 4},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindName,
|
||||
Value: "Foo",
|
||||
Location: LexerLocation{Row: 1, Col: 8},
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
in: "1 100 -100",
|
||||
exp: []LexerToken{
|
||||
{
|
||||
Kind: LexerTokenKindNumber,
|
||||
Value: "1",
|
||||
Location: LexerLocation{Row: 0, Col: 0},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindNumber,
|
||||
Value: "100",
|
||||
Location: LexerLocation{Row: 0, Col: 2},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindNumber,
|
||||
Value: "-100",
|
||||
Location: LexerLocation{Row: 0, Col: 6},
|
||||
},
|
||||
},
|
||||
},
|
||||
{
|
||||
in: "1<2!-3 ()",
|
||||
exp: []LexerToken{
|
||||
{
|
||||
Kind: LexerTokenKindNumber,
|
||||
Value: "1",
|
||||
Location: LexerLocation{Row: 0, Col: 0},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindPunctuation,
|
||||
Value: "<",
|
||||
Location: LexerLocation{Row: 0, Col: 1},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindNumber,
|
||||
Value: "2",
|
||||
Location: LexerLocation{Row: 0, Col: 2},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindPunctuation,
|
||||
Value: "!",
|
||||
Location: LexerLocation{Row: 0, Col: 3},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindNumber,
|
||||
Value: "-3",
|
||||
Location: LexerLocation{Row: 0, Col: 4},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindPunctuation,
|
||||
Value: "(",
|
||||
Location: LexerLocation{Row: 0, Col: 7},
|
||||
},
|
||||
{
|
||||
Kind: LexerTokenKindPunctuation,
|
||||
Value: ")",
|
||||
Location: LexerLocation{Row: 0, Col: 8},
|
||||
},
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
for i, test := range tests {
|
||||
t.Run(strconv.Itoa(i), func(t *testing.T) {
|
||||
|
||||
lexer := NewLexer(&mockReader{body: []byte(test.in), err: expErr})
|
||||
|
||||
for i := range test.exp {
|
||||
tok, err := lexer.Next()
|
||||
assert.NoError(t, err)
|
||||
assert.Equal(t, test.exp[i], tok, "test.exp[%d]", i)
|
||||
}
|
||||
|
||||
tok, err := lexer.Next()
|
||||
assert.ErrorIs(t, err, expErr)
|
||||
assert.Equal(t, LexerToken{}, tok)
|
||||
|
||||
lexErr := new(LexerError)
|
||||
assert.True(t, errors.As(err, &lexErr))
|
||||
|
||||
inParts := strings.Split(test.in, "\n")
|
||||
|
||||
assert.ErrorIs(t, lexErr, expErr)
|
||||
assert.Equal(t, lexErr.Location.Row, len(inParts)-1)
|
||||
assert.Equal(t, lexErr.Location.Col, len(inParts[len(inParts)-1]))
|
||||
})
|
||||
}
|
||||
|
||||
}
|
||||
36
gg/location.go
Normal file
36
gg/location.go
Normal file
@ -0,0 +1,36 @@
|
||||
package gg
|
||||
|
||||
import "fmt"
|
||||
|
||||
// Location indicates a position in a stream of bytes identified by column
|
||||
// within newline-separated rows.
|
||||
type Location struct {
|
||||
Row, Col int
|
||||
}
|
||||
|
||||
func (l Location) errf(str string, args ...any) LocatedError {
|
||||
return LocatedError{l, fmt.Errorf(str, args...)}
|
||||
}
|
||||
|
||||
func (l Location) locate() Location { return l }
|
||||
|
||||
// LocatedError is an error related to a specific point within a decode gg
|
||||
// stream.
|
||||
type LocatedError struct {
|
||||
Location
|
||||
Err error
|
||||
}
|
||||
|
||||
func (e LocatedError) Error() string {
|
||||
return fmt.Sprintf("%d:%d: %v", e.Row, e.Col, e.Err)
|
||||
}
|
||||
|
||||
type locatableRune struct {
|
||||
Location
|
||||
r rune
|
||||
}
|
||||
|
||||
type locatableString struct {
|
||||
Location
|
||||
str string
|
||||
}
|
||||
508
gg/term.go
Normal file
508
gg/term.go
Normal file
@ -0,0 +1,508 @@
|
||||
package gg
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"strconv"
|
||||
"strings"
|
||||
"unicode"
|
||||
|
||||
"github.com/mediocregopher/ginger/graph"
|
||||
"golang.org/x/exp/slices"
|
||||
)
|
||||
|
||||
var (
|
||||
errNoMatch = errors.New("not found")
|
||||
)
|
||||
|
||||
type stringerFn func() string
|
||||
|
||||
func (fn stringerFn) String() string {
|
||||
return fn()
|
||||
}
|
||||
|
||||
type stringerStr string
|
||||
|
||||
func (str stringerStr) String() string {
|
||||
return string(str)
|
||||
}
|
||||
|
||||
type term[T any] struct {
|
||||
name fmt.Stringer
|
||||
decodeFn func(d *Decoder) (T, error)
|
||||
}
|
||||
|
||||
func (t term[T]) String() string {
|
||||
return t.name.String()
|
||||
}
|
||||
|
||||
func firstOf[T any](terms ...*term[T]) *term[T] {
|
||||
if len(terms) < 2 {
|
||||
panic("firstOfTerms requires at least 2 terms")
|
||||
}
|
||||
|
||||
return &term[T]{
|
||||
name: stringerFn(func() string {
|
||||
descrs := make([]string, len(terms))
|
||||
for i := range terms {
|
||||
descrs[i] = terms[i].String()
|
||||
}
|
||||
return strings.Join(descrs, " or ")
|
||||
}),
|
||||
decodeFn: func(d *Decoder) (T, error) {
|
||||
var zero T
|
||||
for _, t := range terms {
|
||||
v, err := t.decodeFn(d)
|
||||
if errors.Is(err, errNoMatch) {
|
||||
continue
|
||||
} else if err != nil {
|
||||
return zero, err
|
||||
}
|
||||
|
||||
return v, nil
|
||||
}
|
||||
|
||||
return zero, errNoMatch
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func seq[Ta, Tb, Tc any](
|
||||
name fmt.Stringer,
|
||||
termA *term[Ta],
|
||||
termB *term[Tb],
|
||||
fn func(Ta, Tb) Tc,
|
||||
) *term[Tc] {
|
||||
return &term[Tc]{
|
||||
name: name,
|
||||
decodeFn: func(d *Decoder) (Tc, error) {
|
||||
var zero Tc
|
||||
|
||||
va, err := termA.decodeFn(d)
|
||||
if err != nil {
|
||||
return zero, err
|
||||
}
|
||||
|
||||
vb, err := termB.decodeFn(d)
|
||||
if errors.Is(err, errNoMatch) {
|
||||
return zero, d.nextLoc().errf("expected %v", termB)
|
||||
} else if err != nil {
|
||||
return zero, err
|
||||
}
|
||||
|
||||
return fn(va, vb), nil
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func prefixed[Ta, Tb any](termA *term[Ta], termB *term[Tb]) *term[Tb] {
|
||||
return seq(termA, termA, termB, func(_ Ta, b Tb) Tb {
|
||||
return b
|
||||
})
|
||||
}
|
||||
|
||||
func prefixIgnored[Ta, Tb any](termA *term[Ta], termB *term[Tb]) *term[Tb] {
|
||||
return &term[Tb]{
|
||||
name: termB,
|
||||
decodeFn: func(d *Decoder) (Tb, error) {
|
||||
var zero Tb
|
||||
if _, err := termA.decodeFn(d); err != nil {
|
||||
return zero, err
|
||||
}
|
||||
return termB.decodeFn(d)
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func suffixIgnored[Ta, Tb any](
|
||||
termA *term[Ta], termB *term[Tb],
|
||||
) *term[Ta] {
|
||||
return seq(termA, termA, termB, func(a Ta, _ Tb) Ta {
|
||||
return a
|
||||
})
|
||||
}
|
||||
|
||||
func oneOrMore[T any](t *term[T]) *term[[]T] {
|
||||
return &term[[]T]{
|
||||
name: stringerFn(func() string {
|
||||
return fmt.Sprintf("one or more %v", t)
|
||||
}),
|
||||
decodeFn: func(d *Decoder) ([]T, error) {
|
||||
var vv []T
|
||||
for {
|
||||
v, err := t.decodeFn(d)
|
||||
if errors.Is(err, errNoMatch) {
|
||||
break
|
||||
} else if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
vv = append(vv, v)
|
||||
}
|
||||
|
||||
if len(vv) == 0 {
|
||||
return nil, errNoMatch
|
||||
}
|
||||
|
||||
return vv, nil
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func zeroOrMore[T any](t *term[T]) *term[[]T] {
|
||||
return &term[[]T]{
|
||||
name: stringerFn(func() string {
|
||||
return fmt.Sprintf("zero or more %v", t)
|
||||
}),
|
||||
decodeFn: func(d *Decoder) ([]T, error) {
|
||||
var vv []T
|
||||
for {
|
||||
v, err := t.decodeFn(d)
|
||||
if errors.Is(err, errNoMatch) {
|
||||
break
|
||||
} else if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
vv = append(vv, v)
|
||||
}
|
||||
|
||||
return vv, nil
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func mapTerm[Ta, Tb any](
|
||||
name fmt.Stringer, t *term[Ta], fn func(Ta) Tb,
|
||||
) *term[Tb] {
|
||||
return &term[Tb]{
|
||||
name: name,
|
||||
decodeFn: func(d *Decoder) (Tb, error) {
|
||||
var zero Tb
|
||||
va, err := t.decodeFn(d)
|
||||
if err != nil {
|
||||
return zero, err
|
||||
}
|
||||
return fn(va), nil
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func runePredTerm(
|
||||
name fmt.Stringer, pred func(rune) bool,
|
||||
) *term[locatableRune] {
|
||||
return &term[locatableRune]{
|
||||
name: name,
|
||||
decodeFn: func(d *Decoder) (locatableRune, error) {
|
||||
lr, err := d.readRune()
|
||||
if errors.Is(err, io.EOF) {
|
||||
return locatableRune{}, errNoMatch
|
||||
} else if err != nil {
|
||||
return locatableRune{}, err
|
||||
}
|
||||
|
||||
if !pred(lr.r) {
|
||||
d.unreadRune(lr)
|
||||
return locatableRune{}, errNoMatch
|
||||
}
|
||||
|
||||
return lr, nil
|
||||
},
|
||||
}
|
||||
}
|
||||
|
||||
func runeTerm(r rune) *term[locatableRune] {
|
||||
return runePredTerm(
|
||||
stringerStr(fmt.Sprintf("'%c'", r)),
|
||||
func(r2 rune) bool { return r2 == r },
|
||||
)
|
||||
}
|
||||
|
||||
func locatableRunesToString(rr []locatableRune) string {
|
||||
str := make([]rune, len(rr))
|
||||
for i := range rr {
|
||||
str[i] = rr[i].r
|
||||
}
|
||||
return string(str)
|
||||
}
|
||||
|
||||
func runesToStringTerm(
|
||||
t *term[[]locatableRune],
|
||||
) *term[locatableString] {
|
||||
return mapTerm(
|
||||
t, t, func(rr []locatableRune) locatableString {
|
||||
return locatableString{rr[0].locate(), locatableRunesToString(rr)}
|
||||
},
|
||||
)
|
||||
}
|
||||
|
||||
func discard[T any](t *term[T]) *term[struct{}] {
|
||||
return mapTerm(t, t, func(_ T) struct{} { return struct{}{} })
|
||||
}
|
||||
|
||||
var (
|
||||
notNewlineTerm = runePredTerm(
|
||||
stringerStr("not-newline"),
|
||||
func(r rune) bool { return r != '\n' },
|
||||
)
|
||||
|
||||
commentTerm = prefixed(
|
||||
prefixed(runeTerm('*'), zeroOrMore(notNewlineTerm)),
|
||||
runeTerm('\n'),
|
||||
)
|
||||
|
||||
whitespaceTerm = zeroOrMore(firstOf(
|
||||
discard(runePredTerm(stringerStr("whitespace"), unicode.IsSpace)),
|
||||
discard(commentTerm),
|
||||
))
|
||||
)
|
||||
|
||||
func trimmedTerm[T any](t *term[T]) *term[T] {
|
||||
t = prefixIgnored(whitespaceTerm, t)
|
||||
t = suffixIgnored(t, whitespaceTerm)
|
||||
return t
|
||||
}
|
||||
|
||||
func trimmedRuneTerm(r rune) *term[locatableRune] {
|
||||
return trimmedTerm(runeTerm(r))
|
||||
}
|
||||
|
||||
var (
|
||||
digitTerm = runePredTerm(
|
||||
stringerStr("digit"),
|
||||
func(r rune) bool { return '0' <= r && r <= '9' },
|
||||
)
|
||||
|
||||
positiveNumberTerm = runesToStringTerm(oneOrMore(digitTerm))
|
||||
|
||||
negativeNumberTerm = seq(
|
||||
stringerStr("negative-number"),
|
||||
runeTerm('-'),
|
||||
positiveNumberTerm,
|
||||
func(neg locatableRune, posNum locatableString) locatableString {
|
||||
return locatableString{neg.locate(), string(neg.r) + posNum.str}
|
||||
},
|
||||
)
|
||||
|
||||
numberTerm = mapTerm(
|
||||
stringerStr("number"),
|
||||
firstOf(negativeNumberTerm, positiveNumberTerm),
|
||||
func(str locatableString) Value {
|
||||
i, err := strconv.ParseInt(str.str, 10, 64)
|
||||
if err != nil {
|
||||
panic(fmt.Errorf("parsing %q as int: %w", str, err))
|
||||
}
|
||||
|
||||
return Value{Number: &i, Location: str.locate()}
|
||||
},
|
||||
)
|
||||
)
|
||||
|
||||
var (
|
||||
letterTerm = runePredTerm(
|
||||
stringerStr("letter"),
|
||||
func(r rune) bool {
|
||||
return unicode.In(r, unicode.Letter, unicode.Mark)
|
||||
},
|
||||
)
|
||||
|
||||
letterTailTerm = zeroOrMore(firstOf(letterTerm, digitTerm))
|
||||
|
||||
nameTerm = seq(
|
||||
stringerStr("name"),
|
||||
letterTerm,
|
||||
letterTailTerm,
|
||||
func(head locatableRune, tail []locatableRune) Value {
|
||||
name := string(head.r) + locatableRunesToString(tail)
|
||||
return Value{Name: &name, Location: head.locate()}
|
||||
},
|
||||
)
|
||||
)
|
||||
|
||||
func openEdgeIntoValue(val Value, oe *OpenEdge) *OpenEdge {
|
||||
switch {
|
||||
case oe == nil:
|
||||
return graph.ValueOut(None, val)
|
||||
case !oe.EdgeValue().Valid:
|
||||
return oe.WithEdgeValue(Some(val))
|
||||
default:
|
||||
return graph.TupleOut(Some(val), oe)
|
||||
}
|
||||
}
|
||||
|
||||
var graphTerm, valueTerm = func() (*term[Value], *term[Value]) {
|
||||
type tupleState struct {
|
||||
ins []*OpenEdge
|
||||
oe *OpenEdge
|
||||
}
|
||||
|
||||
type graphState struct {
|
||||
g *Graph
|
||||
oe *OpenEdge
|
||||
}
|
||||
|
||||
var (
|
||||
rightParenthesis = trimmedRuneTerm(')')
|
||||
tupleEndTerm = mapTerm(
|
||||
rightParenthesis,
|
||||
rightParenthesis,
|
||||
func(lr locatableRune) tupleState {
|
||||
// if ')', then map that to an empty state. This acts as a
|
||||
// sentinel value to indicate "end of tuple".
|
||||
return tupleState{}
|
||||
},
|
||||
)
|
||||
|
||||
rightCurlyBrace = trimmedRuneTerm('}')
|
||||
graphEndTerm = mapTerm(
|
||||
rightCurlyBrace,
|
||||
rightCurlyBrace,
|
||||
func(lr locatableRune) graphState {
|
||||
// if '}', then map that to an empty state. This acts as a
|
||||
// sentinel value to indicate "end of graph".
|
||||
return graphState{}
|
||||
},
|
||||
)
|
||||
)
|
||||
|
||||
var (
|
||||
// pre-define these, and then fill in the pointers after, in order to
|
||||
// deal with recursive dependencies between them.
|
||||
valueTerm = new(term[Value])
|
||||
|
||||
tupleTerm = new(term[*OpenEdge])
|
||||
tupleTailTerm = new(term[tupleState])
|
||||
tupleOpenEdgeTerm = new(term[tupleState])
|
||||
tupleOpenEdgeTailTerm = new(term[tupleState])
|
||||
tupleOpenEdgeValueTailTerm = new(term[tupleState])
|
||||
|
||||
graphTerm = new(term[Value])
|
||||
graphTailTerm = new(term[graphState])
|
||||
graphOpenEdgeTerm = new(term[graphState])
|
||||
graphOpenEdgeTailTerm = new(term[graphState])
|
||||
graphOpenEdgeValueTailTerm = new(term[graphState])
|
||||
)
|
||||
|
||||
*tupleTerm = *seq(
|
||||
stringerStr("tuple"),
|
||||
trimmedRuneTerm('('),
|
||||
tupleTailTerm,
|
||||
func(lr locatableRune, ts tupleState) *OpenEdge {
|
||||
slices.Reverse(ts.ins)
|
||||
return graph.TupleOut(None, ts.ins...)
|
||||
},
|
||||
)
|
||||
|
||||
*tupleTailTerm = *firstOf(
|
||||
tupleEndTerm,
|
||||
mapTerm(
|
||||
tupleOpenEdgeTerm,
|
||||
tupleOpenEdgeTerm,
|
||||
func(ts tupleState) tupleState {
|
||||
ts.ins = append(ts.ins, ts.oe)
|
||||
ts.oe = nil
|
||||
return ts
|
||||
},
|
||||
),
|
||||
)
|
||||
|
||||
*tupleOpenEdgeTerm = *firstOf(
|
||||
seq(
|
||||
valueTerm,
|
||||
valueTerm,
|
||||
tupleOpenEdgeValueTailTerm,
|
||||
func(val Value, ts tupleState) tupleState {
|
||||
ts.oe = openEdgeIntoValue(val, ts.oe)
|
||||
return ts
|
||||
},
|
||||
),
|
||||
seq(
|
||||
tupleTerm,
|
||||
tupleTerm,
|
||||
tupleOpenEdgeTailTerm,
|
||||
func(oe *OpenEdge, ts tupleState) tupleState {
|
||||
ts.oe = oe
|
||||
return ts
|
||||
},
|
||||
),
|
||||
)
|
||||
|
||||
*tupleOpenEdgeTailTerm = *firstOf(
|
||||
tupleEndTerm,
|
||||
prefixed(trimmedRuneTerm(','), tupleTailTerm),
|
||||
)
|
||||
|
||||
*tupleOpenEdgeValueTailTerm = *firstOf(
|
||||
tupleOpenEdgeTailTerm,
|
||||
prefixed(trimmedRuneTerm('<'), tupleOpenEdgeTerm),
|
||||
)
|
||||
|
||||
*graphTerm = *seq(
|
||||
stringerStr("graph"),
|
||||
trimmedRuneTerm('{'),
|
||||
graphTailTerm,
|
||||
func(lr locatableRune, gs graphState) Value {
|
||||
if gs.g == nil {
|
||||
gs.g = new(Graph)
|
||||
}
|
||||
|
||||
return Value{Graph: gs.g, Location: lr.locate()}
|
||||
},
|
||||
)
|
||||
|
||||
*graphTailTerm = *firstOf(
|
||||
graphEndTerm,
|
||||
seq(
|
||||
nameTerm,
|
||||
nameTerm,
|
||||
prefixed(trimmedRuneTerm('='), graphOpenEdgeTerm),
|
||||
func(name Value, gs graphState) graphState {
|
||||
if gs.g == nil {
|
||||
gs.g = new(Graph)
|
||||
}
|
||||
|
||||
gs.g = gs.g.AddValueIn(name, gs.oe)
|
||||
gs.oe = nil
|
||||
return gs
|
||||
},
|
||||
),
|
||||
)
|
||||
|
||||
*graphOpenEdgeTerm = *firstOf(
|
||||
seq(
|
||||
valueTerm,
|
||||
valueTerm,
|
||||
graphOpenEdgeValueTailTerm,
|
||||
func(val Value, gs graphState) graphState {
|
||||
gs.oe = openEdgeIntoValue(val, gs.oe)
|
||||
return gs
|
||||
},
|
||||
),
|
||||
seq(
|
||||
tupleTerm,
|
||||
tupleTerm,
|
||||
graphOpenEdgeTailTerm,
|
||||
func(oe *OpenEdge, gs graphState) graphState {
|
||||
gs.oe = oe
|
||||
return gs
|
||||
},
|
||||
),
|
||||
)
|
||||
|
||||
*graphOpenEdgeTailTerm = *firstOf(
|
||||
graphEndTerm,
|
||||
prefixed(trimmedRuneTerm(';'), graphTailTerm),
|
||||
)
|
||||
|
||||
*graphOpenEdgeValueTailTerm = *firstOf(
|
||||
graphOpenEdgeTailTerm,
|
||||
prefixed(trimmedRuneTerm('<'), graphOpenEdgeTerm),
|
||||
)
|
||||
|
||||
*valueTerm = *firstOf(nameTerm, numberTerm, graphTerm)
|
||||
|
||||
return graphTerm, valueTerm
|
||||
}()
|
||||
|
||||
var topLevelTerm = trimmedTerm(valueTerm)
|
||||
387
gg/term_test.go
Normal file
387
gg/term_test.go
Normal file
@ -0,0 +1,387 @@
|
||||
package gg
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"io"
|
||||
"strconv"
|
||||
"testing"
|
||||
|
||||
"github.com/mediocregopher/ginger/graph"
|
||||
"github.com/stretchr/testify/assert"
|
||||
)
|
||||
|
||||
func decoderLeftover(d *Decoder) string {
|
||||
unread := make([]rune, len(d.unread))
|
||||
for i := range unread {
|
||||
unread[i] = d.unread[i].r
|
||||
}
|
||||
|
||||
rest, err := io.ReadAll(d.br)
|
||||
if err != nil {
|
||||
panic(err)
|
||||
}
|
||||
return string(unread) + string(rest)
|
||||
}
|
||||
|
||||
func TestTermDecoding(t *testing.T) {
|
||||
type test struct {
|
||||
in string
|
||||
exp Value
|
||||
expErr string
|
||||
leftover string
|
||||
}
|
||||
|
||||
runTests := func(
|
||||
t *testing.T, name string, term *term[Value], tests []test,
|
||||
) {
|
||||
t.Run(name, func(t *testing.T) {
|
||||
for i, test := range tests {
|
||||
t.Run(strconv.Itoa(i), func(t *testing.T) {
|
||||
dec := NewDecoder(bytes.NewBufferString(test.in))
|
||||
got, err := term.decodeFn(dec)
|
||||
if test.expErr != "" {
|
||||
assert.Error(t, err)
|
||||
assert.Equal(t, test.expErr, err.Error())
|
||||
} else if assert.NoError(t, err) {
|
||||
assert.True(t,
|
||||
test.exp.Equal(got),
|
||||
"\nexp:%v\ngot:%v", test.exp, got,
|
||||
)
|
||||
assert.Equal(t, test.leftover, decoderLeftover(dec))
|
||||
}
|
||||
})
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
expNum := func(row, col int, n int64) Value {
|
||||
return Value{Number: &n, Location: Location{row, col}}
|
||||
}
|
||||
|
||||
runTests(t, "number", numberTerm, []test{
|
||||
{in: `0`, exp: expNum(1, 1, 0)},
|
||||
{in: `100`, exp: expNum(1, 1, 100)},
|
||||
{in: `-100`, exp: expNum(1, 1, -100)},
|
||||
{in: `0foo`, exp: expNum(1, 1, 0), leftover: "foo"},
|
||||
{in: `100foo`, exp: expNum(1, 1, 100), leftover: "foo"},
|
||||
})
|
||||
|
||||
expName := func(row, col int, name string) Value {
|
||||
return Value{Name: &name, Location: Location{row, col}}
|
||||
}
|
||||
|
||||
expGraph := func(row, col int, g *Graph) Value {
|
||||
return Value{Graph: g, Location: Location{row, col}}
|
||||
}
|
||||
|
||||
runTests(t, "name", nameTerm, []test{
|
||||
{in: `a`, exp: expName(1, 1, "a")},
|
||||
{in: `ab`, exp: expName(1, 1, "ab")},
|
||||
{in: `ab2c`, exp: expName(1, 1, "ab2c")},
|
||||
{in: `ab2c,`, exp: expName(1, 1, "ab2c"), leftover: ","},
|
||||
})
|
||||
|
||||
runTests(t, "graph", graphTerm, []test{
|
||||
{in: `{}`, exp: expGraph(1, 1, new(Graph))},
|
||||
{in: `{`, expErr: `1:2: expected '}' or name`},
|
||||
{in: `{a}`, expErr: `1:3: expected '='`},
|
||||
{in: `{a=}`, expErr: `1:4: expected name or number or graph or tuple`},
|
||||
{
|
||||
in: `{foo=a}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(None, expName(6, 1, "a")),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{ foo = a }`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(None, expName(6, 1, "a")),
|
||||
),
|
||||
),
|
||||
},
|
||||
{in: `{1=a}`, expErr: `1:2: expected '}' or name`},
|
||||
{in: `{foo=a ,}`, expErr: `1:8: expected '}' or ';' or '<'`},
|
||||
{in: `{foo=a`, expErr: `1:7: expected '}' or ';' or '<'`},
|
||||
{
|
||||
in: `{foo=a<b}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
expName(8, 1, "b"),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a< b <c}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.ValueOut(
|
||||
Some(expName(8, 1, "b")),
|
||||
expName(10, 1, "c"),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo =a<b<c<1 }`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.TupleOut(
|
||||
Some(expName(8, 1, "b")),
|
||||
graph.ValueOut(
|
||||
Some(expName(10, 1, "c")),
|
||||
expNum(12, 1, 1),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<b ; }`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
expName(8, 1, "b"),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<b;bar=c}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
expName(8, 1, "b"),
|
||||
),
|
||||
).
|
||||
AddValueIn(
|
||||
expName(10, 1, "bar"),
|
||||
graph.ValueOut(None, expName(15, 1, "c")),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo= a<{ baz=1 } ; bar=c}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
expGraph(8, 1, new(Graph).AddValueIn(
|
||||
expName(9, 1, "baz"),
|
||||
graph.ValueOut(None, expNum(13, 1, 1)),
|
||||
)),
|
||||
),
|
||||
).
|
||||
AddValueIn(
|
||||
expName(16, 1, "bar"),
|
||||
graph.ValueOut(None, expName(20, 1, "c")),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo= {baz=1} <a; bar=c}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expGraph(8, 1, new(Graph).AddValueIn(
|
||||
expName(9, 1, "baz"),
|
||||
graph.ValueOut(None, expNum(13, 1, 1)),
|
||||
))),
|
||||
expName(6, 1, "a"),
|
||||
),
|
||||
).
|
||||
AddValueIn(
|
||||
expName(16, 1, "bar"),
|
||||
graph.ValueOut(None, expName(20, 1, "c")),
|
||||
),
|
||||
),
|
||||
},
|
||||
})
|
||||
|
||||
runTests(t, "tuple", graphTerm, []test{
|
||||
{
|
||||
in: `{foo=(a)}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(None, expName(6, 1, "a")),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=(a<b)}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
expName(8, 1, "b"),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<(b)}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
expName(8, 1, "b"),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<(b,c)}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.ValueOut(None, expName(8, 1, "b")),
|
||||
graph.ValueOut(None, expName(10, 1, "c")),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<(b<c)}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "b")),
|
||||
graph.ValueOut(None, expName(8, 1, "c")),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<(b<(c))}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "b")),
|
||||
graph.ValueOut(None, expName(8, 1, "c")),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<(b<(c,d<1))}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "b")),
|
||||
graph.ValueOut(None, expName(8, 1, "c")),
|
||||
graph.ValueOut(
|
||||
Some(expName(12, 1, "d")),
|
||||
expNum(10, 1, 1),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: `{foo=a<(b<( ( (c) ) ))}`,
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "a")),
|
||||
graph.TupleOut(
|
||||
Some(expName(6, 1, "b")),
|
||||
graph.ValueOut(None, expName(8, 1, "c")),
|
||||
),
|
||||
),
|
||||
),
|
||||
),
|
||||
},
|
||||
})
|
||||
|
||||
runTests(t, "comment", graphTerm, []test{
|
||||
{
|
||||
in: "*\n{}",
|
||||
exp: expGraph(1, 1, new(Graph)),
|
||||
},
|
||||
{
|
||||
in: "* ignore me!\n{}",
|
||||
exp: expGraph(1, 1, new(Graph)),
|
||||
},
|
||||
{
|
||||
in: "{* ignore me!\n}",
|
||||
exp: expGraph(1, 1, new(Graph)),
|
||||
},
|
||||
{
|
||||
in: "{foo* ignore me!\n = a}",
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(None, expName(6, 1, "a")),
|
||||
),
|
||||
),
|
||||
},
|
||||
{
|
||||
in: "{foo = a* ignore me!\n}",
|
||||
exp: expGraph(
|
||||
1, 1, new(Graph).
|
||||
AddValueIn(
|
||||
expName(2, 1, "foo"),
|
||||
graph.ValueOut(None, expName(6, 1, "a")),
|
||||
),
|
||||
),
|
||||
},
|
||||
})
|
||||
}
|
||||
@ -1,23 +0,0 @@
|
||||
package gg
|
||||
|
||||
import "io"
|
||||
|
||||
type mockReader struct {
|
||||
body []byte
|
||||
err error
|
||||
}
|
||||
|
||||
func (r *mockReader) Read(b []byte) (int, error) {
|
||||
|
||||
n := copy(b, r.body)
|
||||
r.body = r.body[n:]
|
||||
|
||||
if len(r.body) == 0 {
|
||||
if r.err == nil {
|
||||
return n, io.EOF
|
||||
}
|
||||
return n, r.err
|
||||
}
|
||||
|
||||
return n, nil
|
||||
}
|
||||
5
go.mod
5
go.mod
@ -2,7 +2,10 @@ module github.com/mediocregopher/ginger
|
||||
|
||||
go 1.18
|
||||
|
||||
require github.com/stretchr/testify v1.7.0
|
||||
require (
|
||||
github.com/stretchr/testify v1.7.0
|
||||
golang.org/x/exp v0.0.0-20231006140011-7918f672742d
|
||||
)
|
||||
|
||||
require (
|
||||
github.com/davecgh/go-spew v1.1.0 // indirect
|
||||
|
||||
2
go.sum
2
go.sum
@ -5,6 +5,8 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
|
||||
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
|
||||
github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
|
||||
github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
|
||||
golang.org/x/exp v0.0.0-20231006140011-7918f672742d h1:jtJma62tbqLibJ5sFQz8bKtEM8rJBtfilJ2qTU199MI=
|
||||
golang.org/x/exp v0.0.0-20231006140011-7918f672742d/go.mod h1:ldy0pHrwJyGW56pPQzzkH36rKxoZW1tw7ZJpeKx+hdo=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
|
||||
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
|
||||
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
|
||||
|
||||
@ -126,7 +126,7 @@ func TupleOut[E, V Value](edgeVal E, ins ...*OpenEdge[E, V]) *OpenEdge[E, V] {
|
||||
if len(ins) == 1 {
|
||||
|
||||
var (
|
||||
zero V
|
||||
zero E
|
||||
in = ins[0]
|
||||
)
|
||||
|
||||
@ -353,7 +353,6 @@ type reducedEdge[Ea, Va Value, Vb any] struct {
|
||||
// If a value or edge is connected to multiple times within the root OpenEdge it
|
||||
// will only be mapped/reduced a single time, and the result of that single
|
||||
// map/reduction will be passed to each dependant operation.
|
||||
//
|
||||
func MapReduce[Ea, Va Value, Vb any](
|
||||
root *OpenEdge[Ea, Va],
|
||||
mapVal func(Va) (Vb, error),
|
||||
|
||||
@ -31,11 +31,6 @@ func Identity(val Value) Function {
|
||||
})
|
||||
}
|
||||
|
||||
type graphFn struct {
|
||||
*gg.Graph
|
||||
scope Scope
|
||||
}
|
||||
|
||||
var (
|
||||
valNameIn = Value{Value: gg.Name("in")}
|
||||
valNameOut = Value{Value: gg.Name("out")}
|
||||
@ -104,12 +99,12 @@ func FunctionFromGraph(g *gg.Graph, scope Scope) (Function, error) {
|
||||
|
||||
compileEdge = func(edge *gg.OpenEdge) (edgeFn, error) {
|
||||
|
||||
return graph.MapReduce[gg.Value, gg.Value, edgeFn](
|
||||
return graph.MapReduce[gg.OptionalValue, gg.Value, edgeFn](
|
||||
edge,
|
||||
func(ggVal gg.Value) (edgeFn, error) {
|
||||
return valToEdgeFn(Value{Value: ggVal})
|
||||
},
|
||||
func(ggEdgeVal gg.Value, inEdgeFns []edgeFn) (edgeFn, error) {
|
||||
func(ggEdgeVal gg.OptionalValue, inEdgeFns []edgeFn) (edgeFn, error) {
|
||||
|
||||
if ggEdgeVal.Equal(valNameIf.Value) {
|
||||
|
||||
@ -147,7 +142,10 @@ func FunctionFromGraph(g *gg.Graph, scope Scope) (Function, error) {
|
||||
}))
|
||||
}
|
||||
|
||||
edgeVal := Value{Value: ggEdgeVal}
|
||||
var edgeVal Value
|
||||
if ggEdgeVal.Valid {
|
||||
edgeVal.Value = ggEdgeVal.Value
|
||||
}
|
||||
|
||||
if edgeVal.IsZero() {
|
||||
return inEdgeFn, nil
|
||||
|
||||
14
vm/vm.go
14
vm/vm.go
@ -2,6 +2,7 @@
|
||||
package vm
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"io"
|
||||
"strings"
|
||||
@ -44,7 +45,7 @@ func (v Value) Equal(v2g graph.Value) bool {
|
||||
|
||||
switch {
|
||||
|
||||
case !v.Value.IsZero() || !v2.Value.IsZero():
|
||||
case (v.Value != (gg.Value{}) || v2.Value != (gg.Value{})):
|
||||
return v.Value.Equal(v2.Value)
|
||||
|
||||
case v.Function != nil || v2.Function != nil:
|
||||
@ -81,7 +82,7 @@ func (v Value) String() string {
|
||||
// We can try to get better strings for ops later
|
||||
return "<fn>"
|
||||
|
||||
case !v.Value.IsZero():
|
||||
case v.Value != (gg.Value{}):
|
||||
return v.Value.String()
|
||||
|
||||
default:
|
||||
@ -106,15 +107,14 @@ func (v Value) String() string {
|
||||
// scope contains pre-defined operations and values which are available during
|
||||
// the evaluation.
|
||||
func EvaluateSource(opSrc io.Reader, input Value, scope Scope) (Value, error) {
|
||||
lexer := gg.NewLexer(opSrc)
|
||||
|
||||
g, err := gg.DecodeLexer(lexer)
|
||||
v, err := gg.NewDecoder(opSrc).Next()
|
||||
if err != nil {
|
||||
return Value{}, err
|
||||
} else if v.Graph == nil {
|
||||
return Value{}, errors.New("value must be a graph")
|
||||
}
|
||||
|
||||
fn, err := FunctionFromGraph(g, scope.NewScope())
|
||||
|
||||
fn, err := FunctionFromGraph(v.Graph, scope.NewScope())
|
||||
if err != nil {
|
||||
return Value{}, err
|
||||
}
|
||||
|
||||
@ -10,11 +10,11 @@ import (
|
||||
|
||||
func TestVM(t *testing.T) {
|
||||
|
||||
src := `
|
||||
incr = { out = add < (1; in;); };
|
||||
src := `{
|
||||
incr = { out = add < (1, in); };
|
||||
|
||||
out = incr < incr < in;
|
||||
`
|
||||
}`
|
||||
|
||||
var in int64 = 5
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user