comment out a bunch of types I don't feel like supporting right now, and all of the parsing code

This commit is contained in:
Brian Picciano 2016-08-05 11:48:42 -06:00
parent 45ce802b35
commit bdd5711773
3 changed files with 448 additions and 457 deletions

View File

@ -106,7 +106,7 @@ func (v Void) LLVMVal(ctx *Ctx, lctx LLVMCtx) llvm.Value {
}
////////////////////////////////////////////////////////////////////////////////
/*
// Bool represents a true or false value
type Bool bool
@ -132,7 +132,7 @@ func (b Bool) equal(e equaler) bool {
}
return bb == b
}
*/
////////////////////////////////////////////////////////////////////////////////
// Int represents an integer value
@ -164,7 +164,7 @@ func (i Int) equal(e equaler) bool {
}
////////////////////////////////////////////////////////////////////////////////
/*
// String represents a string value
type String string
@ -190,7 +190,7 @@ func (s String) equal(e equaler) bool {
}
return ss == s
}
*/
////////////////////////////////////////////////////////////////////////////////
// Identifier represents a binding to some other value which has been given a
@ -303,6 +303,7 @@ func (tup Tuple) equal(e equaler) bool {
// used as the input to the pipe, and the output of the pipe is the output of
// the statement
type Statement struct {
// TODO change to Op and Arg
In Expr
To Expr
}

View File

@ -1,303 +1,299 @@
package expr
import (
"fmt"
"io"
"strconv"
"github.com/mediocregopher/ginger/lexer"
)
type exprErr struct {
reason string
err error
tok lexer.Token
tokCtx string // e.g. "block starting at" or "open paren at"
}
func (e exprErr) Error() string {
var msg string
if e.err != nil {
msg = e.err.Error()
} else {
msg = e.reason
}
if err := e.tok.Err(); err != nil {
msg += " - token error: " + err.Error()
} else if (e.tok != lexer.Token{}) {
msg += " - "
if e.tokCtx != "" {
msg += e.tokCtx + ": "
}
msg = fmt.Sprintf("%s [line:%d col:%d]", msg, e.tok.Row, e.tok.Col)
}
return msg
}
////////////////////////////////////////////////////////////////////////////////
// toks[0] must be start
func sliceEnclosedToks(toks []lexer.Token, start, end lexer.Token) ([]lexer.Token, []lexer.Token, error) {
c := 1
ret := []lexer.Token{}
first := toks[0]
for i, tok := range toks[1:] {
if tok.Err() != nil {
return nil, nil, exprErr{
reason: fmt.Sprintf("missing closing %v", end),
tok: tok,
}
}
if tok.Equal(start) {
c++
} else if tok.Equal(end) {
c--
}
if c == 0 {
return ret, toks[2+i:], nil
}
ret = append(ret, tok)
}
return nil, nil, exprErr{
reason: fmt.Sprintf("missing closing %v", end),
tok: first,
tokCtx: "starting at",
}
}
// Parse reads in all expressions it can from the given io.Reader and returns
// them
func Parse(r io.Reader) ([]Expr, error) {
toks := readAllToks(r)
var ret []Expr
var expr Expr
var err error
for len(toks) > 0 {
if toks[0].TokenType == lexer.EOF {
return ret, nil
}
expr, toks, err = parse(toks)
if err != nil {
return nil, err
}
ret = append(ret, expr)
}
return ret, nil
}
// ParseAsBlock reads the given io.Reader as if it was implicitly surrounded by
// curly braces, making it into a Block. This means all expressions from the
// io.Reader *must* be statements. The returned Expr's Actual will always be a
// Block.
func ParseAsBlock(r io.Reader) (Expr, error) {
return parseBlock(readAllToks(r))
}
func readAllToks(r io.Reader) []lexer.Token {
l := lexer.New(r)
var toks []lexer.Token
for l.HasNext() {
toks = append(toks, l.Next())
}
return toks
}
// For all parse methods it is assumed that toks is not empty
var (
openParen = lexer.Token{TokenType: lexer.Wrapper, Val: "("}
closeParen = lexer.Token{TokenType: lexer.Wrapper, Val: ")"}
openCurly = lexer.Token{TokenType: lexer.Wrapper, Val: "{"}
closeCurly = lexer.Token{TokenType: lexer.Wrapper, Val: "}"}
comma = lexer.Token{TokenType: lexer.Punctuation, Val: ","}
arrow = lexer.Token{TokenType: lexer.Punctuation, Val: ">"}
)
func parse(toks []lexer.Token) (Expr, []lexer.Token, error) {
expr, toks, err := parseSingle(toks)
if err != nil {
return Expr{}, nil, err
}
if len(toks) > 0 && toks[0].TokenType == lexer.Punctuation {
return parseConnectingPunct(toks, expr)
}
return expr, toks, nil
}
func parseSingle(toks []lexer.Token) (Expr, []lexer.Token, error) {
var expr Expr
var err error
if toks[0].Err() != nil {
return Expr{}, nil, exprErr{
reason: "could not parse token",
tok: toks[0],
}
}
if toks[0].Equal(openParen) {
starter := toks[0]
var ptoks []lexer.Token
ptoks, toks, err = sliceEnclosedToks(toks, openParen, closeParen)
if err != nil {
return Expr{}, nil, err
}
if expr, ptoks, err = parse(ptoks); err != nil {
return Expr{}, nil, err
} else if len(ptoks) > 0 {
return Expr{}, nil, exprErr{
reason: "multiple expressions inside parenthesis",
tok: starter,
tokCtx: "starting at",
}
}
return expr, toks, nil
} else if toks[0].Equal(openCurly) {
var btoks []lexer.Token
btoks, toks, err = sliceEnclosedToks(toks, openCurly, closeCurly)
if err != nil {
return Expr{}, nil, err
}
if expr, err = parseBlock(btoks); err != nil {
return Expr{}, nil, err
}
return expr, toks, nil
}
if expr, err = parseNonPunct(toks[0]); err != nil {
return Expr{}, nil, err
}
return expr, toks[1:], nil
}
func parseNonPunct(tok lexer.Token) (Expr, error) {
if tok.TokenType == lexer.Identifier {
return parseIdentifier(tok)
} else if tok.TokenType == lexer.String {
return parseString(tok)
}
return Expr{}, exprErr{
reason: "unexpected non-punctuation token",
tok: tok,
}
}
func parseIdentifier(t lexer.Token) (Expr, error) {
e := Expr{Token: t}
if t.Val[0] == '-' || (t.Val[0] >= '0' && t.Val[0] <= '9') {
n, err := strconv.ParseInt(t.Val, 10, 64)
if err != nil {
return Expr{}, exprErr{
err: err,
tok: t,
}
}
e.Actual = Int(n)
} else if t.Val == "%true" {
e.Actual = Bool(true)
} else if t.Val == "%false" {
e.Actual = Bool(false)
} else if t.Val[0] == '%' {
e.Actual = Macro(t.Val[1:])
} else {
e.Actual = Identifier(t.Val)
}
return e, nil
}
func parseString(t lexer.Token) (Expr, error) {
str, err := strconv.Unquote(t.Val)
if err != nil {
return Expr{}, exprErr{
err: err,
tok: t,
}
}
return Expr{Token: t, Actual: String(str)}, nil
}
func parseConnectingPunct(toks []lexer.Token, root Expr) (Expr, []lexer.Token, error) {
if toks[0].Equal(comma) {
return parseTuple(toks, root)
} else if toks[0].Equal(arrow) {
expr, toks, err := parse(toks[1:])
if err != nil {
return Expr{}, nil, err
}
return Expr{Token: root.Token, Actual: Statement{In: root, To: expr}}, toks, nil
}
return root, toks, nil
}
func parseTuple(toks []lexer.Token, root Expr) (Expr, []lexer.Token, error) {
rootTup, ok := root.Actual.(Tuple)
if !ok {
rootTup = Tuple{root}
}
// rootTup is modified throughout, be we need to make it into an Expr for
// every return, which is annoying. so make a function to do it on the fly
mkRoot := func() Expr {
return Expr{Token: rootTup[0].Token, Actual: rootTup}
}
if len(toks) < 2 {
return mkRoot(), toks, nil
} else if !toks[0].Equal(comma) {
if toks[0].TokenType == lexer.Punctuation {
return parseConnectingPunct(toks, mkRoot())
}
return mkRoot(), toks, nil
}
var expr Expr
var err error
if expr, toks, err = parseSingle(toks[1:]); err != nil {
return Expr{}, nil, err
}
rootTup = append(rootTup, expr)
return parseTuple(toks, mkRoot())
}
// parseBlock assumes that the given token list is the entire block, already
// pulled from outer curly braces by sliceEnclosedToks, or determined to be the
// entire block in some other way.
func parseBlock(toks []lexer.Token) (Expr, error) {
b := Block{}
first := toks[0]
var expr Expr
var err error
for {
if len(toks) == 0 {
return Expr{Token: first, Actual: b}, nil
}
if expr, toks, err = parse(toks); err != nil {
return Expr{}, err
}
if _, ok := expr.Actual.(Statement); !ok {
return Expr{}, exprErr{
reason: "blocks may only contain full statements",
tok: expr.Token,
tokCtx: "non-statement here",
}
}
b = append(b, expr)
}
}
//type exprErr struct {
// reason string
// err error
// tok lexer.Token
// tokCtx string // e.g. "block starting at" or "open paren at"
//}
//
//func (e exprErr) Error() string {
// var msg string
// if e.err != nil {
// msg = e.err.Error()
// } else {
// msg = e.reason
// }
// if err := e.tok.Err(); err != nil {
// msg += " - token error: " + err.Error()
// } else if (e.tok != lexer.Token{}) {
// msg += " - "
// if e.tokCtx != "" {
// msg += e.tokCtx + ": "
// }
// msg = fmt.Sprintf("%s [line:%d col:%d]", msg, e.tok.Row, e.tok.Col)
// }
// return msg
//}
//
//////////////////////////////////////////////////////////////////////////////////
//
//// toks[0] must be start
//func sliceEnclosedToks(toks []lexer.Token, start, end lexer.Token) ([]lexer.Token, []lexer.Token, error) {
// c := 1
// ret := []lexer.Token{}
// first := toks[0]
// for i, tok := range toks[1:] {
// if tok.Err() != nil {
// return nil, nil, exprErr{
// reason: fmt.Sprintf("missing closing %v", end),
// tok: tok,
// }
// }
//
// if tok.Equal(start) {
// c++
// } else if tok.Equal(end) {
// c--
// }
// if c == 0 {
// return ret, toks[2+i:], nil
// }
// ret = append(ret, tok)
// }
//
// return nil, nil, exprErr{
// reason: fmt.Sprintf("missing closing %v", end),
// tok: first,
// tokCtx: "starting at",
// }
//}
//
//// Parse reads in all expressions it can from the given io.Reader and returns
//// them
//func Parse(r io.Reader) ([]Expr, error) {
// toks := readAllToks(r)
// var ret []Expr
// var expr Expr
// var err error
// for len(toks) > 0 {
// if toks[0].TokenType == lexer.EOF {
// return ret, nil
// }
// expr, toks, err = parse(toks)
// if err != nil {
// return nil, err
// }
// ret = append(ret, expr)
// }
// return ret, nil
//}
//
//// ParseAsBlock reads the given io.Reader as if it was implicitly surrounded by
//// curly braces, making it into a Block. This means all expressions from the
//// io.Reader *must* be statements. The returned Expr's Actual will always be a
//// Block.
//func ParseAsBlock(r io.Reader) (Expr, error) {
// return parseBlock(readAllToks(r))
//}
//
//func readAllToks(r io.Reader) []lexer.Token {
// l := lexer.New(r)
// var toks []lexer.Token
// for l.HasNext() {
// toks = append(toks, l.Next())
// }
// return toks
//}
//
//// For all parse methods it is assumed that toks is not empty
//
//var (
// openParen = lexer.Token{TokenType: lexer.Wrapper, Val: "("}
// closeParen = lexer.Token{TokenType: lexer.Wrapper, Val: ")"}
// openCurly = lexer.Token{TokenType: lexer.Wrapper, Val: "{"}
// closeCurly = lexer.Token{TokenType: lexer.Wrapper, Val: "}"}
// comma = lexer.Token{TokenType: lexer.Punctuation, Val: ","}
// arrow = lexer.Token{TokenType: lexer.Punctuation, Val: ">"}
//)
//
//func parse(toks []lexer.Token) (Expr, []lexer.Token, error) {
// expr, toks, err := parseSingle(toks)
// if err != nil {
// return Expr{}, nil, err
// }
//
// if len(toks) > 0 && toks[0].TokenType == lexer.Punctuation {
// return parseConnectingPunct(toks, expr)
// }
//
// return expr, toks, nil
//}
//
//func parseSingle(toks []lexer.Token) (Expr, []lexer.Token, error) {
// var expr Expr
// var err error
//
// if toks[0].Err() != nil {
// return Expr{}, nil, exprErr{
// reason: "could not parse token",
// tok: toks[0],
// }
// }
//
// if toks[0].Equal(openParen) {
// starter := toks[0]
// var ptoks []lexer.Token
// ptoks, toks, err = sliceEnclosedToks(toks, openParen, closeParen)
// if err != nil {
// return Expr{}, nil, err
// }
//
// if expr, ptoks, err = parse(ptoks); err != nil {
// return Expr{}, nil, err
// } else if len(ptoks) > 0 {
// return Expr{}, nil, exprErr{
// reason: "multiple expressions inside parenthesis",
// tok: starter,
// tokCtx: "starting at",
// }
// }
// return expr, toks, nil
//
// } else if toks[0].Equal(openCurly) {
// var btoks []lexer.Token
// btoks, toks, err = sliceEnclosedToks(toks, openCurly, closeCurly)
// if err != nil {
// return Expr{}, nil, err
// }
//
// if expr, err = parseBlock(btoks); err != nil {
// return Expr{}, nil, err
// }
// return expr, toks, nil
// }
//
// if expr, err = parseNonPunct(toks[0]); err != nil {
// return Expr{}, nil, err
// }
// return expr, toks[1:], nil
//}
//
//func parseNonPunct(tok lexer.Token) (Expr, error) {
// if tok.TokenType == lexer.Identifier {
// return parseIdentifier(tok)
// } else if tok.TokenType == lexer.String {
// //return parseString(tok)
// }
//
// return Expr{}, exprErr{
// reason: "unexpected non-punctuation token",
// tok: tok,
// }
//}
//
//func parseIdentifier(t lexer.Token) (Expr, error) {
// e := Expr{Token: t}
// if t.Val[0] == '-' || (t.Val[0] >= '0' && t.Val[0] <= '9') {
// n, err := strconv.ParseInt(t.Val, 10, 64)
// if err != nil {
// return Expr{}, exprErr{
// err: err,
// tok: t,
// }
// }
// e.Actual = Int(n)
//
// /*
// } else if t.Val == "%true" {
// e.Actual = Bool(true)
//
// } else if t.Val == "%false" {
// e.Actual = Bool(false)
// */
//
// } else if t.Val[0] == '%' {
// e.Actual = Macro(t.Val[1:])
//
// } else {
// e.Actual = Identifier(t.Val)
// }
//
// return e, nil
//}
//
///*
//func parseString(t lexer.Token) (Expr, error) {
// str, err := strconv.Unquote(t.Val)
// if err != nil {
// return Expr{}, exprErr{
// err: err,
// tok: t,
// }
// }
// return Expr{Token: t, Actual: String(str)}, nil
//}
//*/
//
//func parseConnectingPunct(toks []lexer.Token, root Expr) (Expr, []lexer.Token, error) {
// if toks[0].Equal(comma) {
// return parseTuple(toks, root)
//
// } else if toks[0].Equal(arrow) {
// expr, toks, err := parse(toks[1:])
// if err != nil {
// return Expr{}, nil, err
// }
// return Expr{Token: root.Token, Actual: Statement{In: root, To: expr}}, toks, nil
// }
//
// return root, toks, nil
//}
//
//func parseTuple(toks []lexer.Token, root Expr) (Expr, []lexer.Token, error) {
// rootTup, ok := root.Actual.(Tuple)
// if !ok {
// rootTup = Tuple{root}
// }
//
// // rootTup is modified throughout, be we need to make it into an Expr for
// // every return, which is annoying. so make a function to do it on the fly
// mkRoot := func() Expr {
// return Expr{Token: rootTup[0].Token, Actual: rootTup}
// }
//
// if len(toks) < 2 {
// return mkRoot(), toks, nil
// } else if !toks[0].Equal(comma) {
// if toks[0].TokenType == lexer.Punctuation {
// return parseConnectingPunct(toks, mkRoot())
// }
// return mkRoot(), toks, nil
// }
//
// var expr Expr
// var err error
// if expr, toks, err = parseSingle(toks[1:]); err != nil {
// return Expr{}, nil, err
// }
//
// rootTup = append(rootTup, expr)
// return parseTuple(toks, mkRoot())
//}
//
//// parseBlock assumes that the given token list is the entire block, already
//// pulled from outer curly braces by sliceEnclosedToks, or determined to be the
//// entire block in some other way.
//func parseBlock(toks []lexer.Token) (Expr, error) {
// b := Block{}
// first := toks[0]
// var expr Expr
// var err error
// for {
// if len(toks) == 0 {
// return Expr{Token: first, Actual: b}, nil
// }
//
// if expr, toks, err = parse(toks); err != nil {
// return Expr{}, err
// }
// if _, ok := expr.Actual.(Statement); !ok {
// return Expr{}, exprErr{
// reason: "blocks may only contain full statements",
// tok: expr.Token,
// tokCtx: "non-statement here",
// }
// }
// b = append(b, expr)
// }
//}

View File

@ -1,155 +1,149 @@
package expr
import (
. "testing"
//import . "testing"
"github.com/mediocregopher/ginger/lexer"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestSliceEnclosedToks(t *T) {
doAssert := func(in, expOut, expRem []lexer.Token) {
out, rem, err := sliceEnclosedToks(in, openParen, closeParen)
require.Nil(t, err)
assert.Equal(t, expOut, out)
assert.Equal(t, expRem, rem)
}
foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
bar := lexer.Token{TokenType: lexer.Identifier, Val: "bar"}
toks := []lexer.Token{openParen, closeParen}
doAssert(toks, []lexer.Token{}, []lexer.Token{})
toks = []lexer.Token{openParen, foo, closeParen, bar}
doAssert(toks, []lexer.Token{foo}, []lexer.Token{bar})
toks = []lexer.Token{openParen, foo, foo, closeParen, bar, bar}
doAssert(toks, []lexer.Token{foo, foo}, []lexer.Token{bar, bar})
toks = []lexer.Token{openParen, foo, openParen, bar, closeParen, closeParen}
doAssert(toks, []lexer.Token{foo, openParen, bar, closeParen}, []lexer.Token{})
toks = []lexer.Token{openParen, foo, openParen, bar, closeParen, bar, closeParen, foo}
doAssert(toks, []lexer.Token{foo, openParen, bar, closeParen, bar}, []lexer.Token{foo})
}
func assertParse(t *T, in []lexer.Token, expExpr Expr, expOut []lexer.Token) {
expr, out, err := parse(in)
require.Nil(t, err)
assert.True(t, expExpr.equal(expr), "expr:%+v expExpr:%+v", expr, expExpr)
assert.Equal(t, expOut, out, "out:%v expOut:%v", out, expOut)
}
func TestParseSingle(t *T) {
foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
fooM := lexer.Token{TokenType: lexer.Identifier, Val: "%foo"}
fooExpr := Expr{Actual: Identifier("foo")}
fooMExpr := Expr{Actual: Macro("foo")}
toks := []lexer.Token{foo}
assertParse(t, toks, fooExpr, []lexer.Token{})
toks = []lexer.Token{foo, foo}
assertParse(t, toks, fooExpr, []lexer.Token{foo})
toks = []lexer.Token{openParen, foo, closeParen, foo}
assertParse(t, toks, fooExpr, []lexer.Token{foo})
toks = []lexer.Token{openParen, openParen, foo, closeParen, closeParen, foo}
assertParse(t, toks, fooExpr, []lexer.Token{foo})
toks = []lexer.Token{fooM, foo}
assertParse(t, toks, fooMExpr, []lexer.Token{foo})
}
func TestParseTuple(t *T) {
tup := func(ee ...Expr) Expr {
return Expr{Actual: Tuple(ee)}
}
foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
fooExpr := Expr{Actual: Identifier("foo")}
toks := []lexer.Token{foo, comma, foo}
assertParse(t, toks, tup(fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, comma, foo, foo}
assertParse(t, toks, tup(fooExpr, fooExpr), []lexer.Token{foo})
toks = []lexer.Token{foo, comma, foo, comma, foo}
assertParse(t, toks, tup(fooExpr, fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, comma, foo, comma, foo, comma, foo}
assertParse(t, toks, tup(fooExpr, fooExpr, fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, comma, openParen, foo, comma, foo, closeParen, comma, foo}
assertParse(t, toks, tup(fooExpr, tup(fooExpr, fooExpr), fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, comma, openParen, foo, comma, foo, closeParen, comma, foo, foo}
assertParse(t, toks, tup(fooExpr, tup(fooExpr, fooExpr), fooExpr), []lexer.Token{foo})
}
func TestParseStatement(t *T) {
stmt := func(in, to Expr) Expr {
return Expr{Actual: Statement{In: in, To: to}}
}
foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
fooExpr := Expr{Actual: Identifier("foo")}
toks := []lexer.Token{foo, arrow, foo}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{openParen, foo, arrow, foo, closeParen}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, arrow, openParen, foo, closeParen}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, arrow, foo}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{foo, arrow, foo, foo}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{foo})
toks = []lexer.Token{foo, arrow, openParen, foo, closeParen, foo}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{foo})
toks = []lexer.Token{openParen, foo, closeParen, arrow, openParen, foo, closeParen, foo}
assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{foo})
fooTupExpr := Expr{Actual: Tuple{fooExpr, fooExpr}}
toks = []lexer.Token{foo, arrow, openParen, foo, comma, foo, closeParen, foo}
assertParse(t, toks, stmt(fooExpr, fooTupExpr), []lexer.Token{foo})
toks = []lexer.Token{foo, comma, foo, arrow, foo}
assertParse(t, toks, stmt(fooTupExpr, fooExpr), []lexer.Token{})
toks = []lexer.Token{openParen, foo, comma, foo, closeParen, arrow, foo}
assertParse(t, toks, stmt(fooTupExpr, fooExpr), []lexer.Token{})
}
func TestParseBlock(t *T) {
stmt := func(in, to Expr) Expr {
return Expr{Actual: Statement{In: in, To: to}}
}
block := func(stmts ...Expr) Expr {
return Expr{Actual: Block(stmts)}
}
foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
fooExpr := Expr{Actual: Identifier("foo")}
toks := []lexer.Token{openCurly, foo, arrow, foo, closeCurly}
assertParse(t, toks, block(stmt(fooExpr, fooExpr)), []lexer.Token{})
toks = []lexer.Token{openCurly, foo, arrow, foo, closeCurly, foo}
assertParse(t, toks, block(stmt(fooExpr, fooExpr)), []lexer.Token{foo})
toks = []lexer.Token{openCurly, foo, arrow, foo, openParen, foo, arrow, foo, closeParen, closeCurly, foo}
assertParse(t, toks, block(stmt(fooExpr, fooExpr), stmt(fooExpr, fooExpr)), []lexer.Token{foo})
toks = []lexer.Token{openCurly, foo, arrow, foo, openParen, foo, arrow, foo, closeParen, closeCurly, foo}
assertParse(t, toks, block(stmt(fooExpr, fooExpr), stmt(fooExpr, fooExpr)), []lexer.Token{foo})
}
//func TestSliceEnclosedToks(t *T) {
// doAssert := func(in, expOut, expRem []lexer.Token) {
// out, rem, err := sliceEnclosedToks(in, openParen, closeParen)
// require.Nil(t, err)
// assert.Equal(t, expOut, out)
// assert.Equal(t, expRem, rem)
// }
// foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
// bar := lexer.Token{TokenType: lexer.Identifier, Val: "bar"}
//
// toks := []lexer.Token{openParen, closeParen}
// doAssert(toks, []lexer.Token{}, []lexer.Token{})
//
// toks = []lexer.Token{openParen, foo, closeParen, bar}
// doAssert(toks, []lexer.Token{foo}, []lexer.Token{bar})
//
// toks = []lexer.Token{openParen, foo, foo, closeParen, bar, bar}
// doAssert(toks, []lexer.Token{foo, foo}, []lexer.Token{bar, bar})
//
// toks = []lexer.Token{openParen, foo, openParen, bar, closeParen, closeParen}
// doAssert(toks, []lexer.Token{foo, openParen, bar, closeParen}, []lexer.Token{})
//
// toks = []lexer.Token{openParen, foo, openParen, bar, closeParen, bar, closeParen, foo}
// doAssert(toks, []lexer.Token{foo, openParen, bar, closeParen, bar}, []lexer.Token{foo})
//}
//
//func assertParse(t *T, in []lexer.Token, expExpr Expr, expOut []lexer.Token) {
// expr, out, err := parse(in)
// require.Nil(t, err)
// assert.True(t, expExpr.equal(expr), "expr:%+v expExpr:%+v", expr, expExpr)
// assert.Equal(t, expOut, out, "out:%v expOut:%v", out, expOut)
//}
//
//func TestParseSingle(t *T) {
// foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
// fooM := lexer.Token{TokenType: lexer.Identifier, Val: "%foo"}
// fooExpr := Expr{Actual: Identifier("foo")}
// fooMExpr := Expr{Actual: Macro("foo")}
//
// toks := []lexer.Token{foo}
// assertParse(t, toks, fooExpr, []lexer.Token{})
//
// toks = []lexer.Token{foo, foo}
// assertParse(t, toks, fooExpr, []lexer.Token{foo})
//
// toks = []lexer.Token{openParen, foo, closeParen, foo}
// assertParse(t, toks, fooExpr, []lexer.Token{foo})
//
// toks = []lexer.Token{openParen, openParen, foo, closeParen, closeParen, foo}
// assertParse(t, toks, fooExpr, []lexer.Token{foo})
//
// toks = []lexer.Token{fooM, foo}
// assertParse(t, toks, fooMExpr, []lexer.Token{foo})
//}
//
//func TestParseTuple(t *T) {
// tup := func(ee ...Expr) Expr {
// return Expr{Actual: Tuple(ee)}
// }
//
// foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
// fooExpr := Expr{Actual: Identifier("foo")}
//
// toks := []lexer.Token{foo, comma, foo}
// assertParse(t, toks, tup(fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, comma, foo, foo}
// assertParse(t, toks, tup(fooExpr, fooExpr), []lexer.Token{foo})
//
// toks = []lexer.Token{foo, comma, foo, comma, foo}
// assertParse(t, toks, tup(fooExpr, fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, comma, foo, comma, foo, comma, foo}
// assertParse(t, toks, tup(fooExpr, fooExpr, fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, comma, openParen, foo, comma, foo, closeParen, comma, foo}
// assertParse(t, toks, tup(fooExpr, tup(fooExpr, fooExpr), fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, comma, openParen, foo, comma, foo, closeParen, comma, foo, foo}
// assertParse(t, toks, tup(fooExpr, tup(fooExpr, fooExpr), fooExpr), []lexer.Token{foo})
//}
//
//func TestParseStatement(t *T) {
// stmt := func(in, to Expr) Expr {
// return Expr{Actual: Statement{In: in, To: to}}
// }
//
// foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
// fooExpr := Expr{Actual: Identifier("foo")}
//
// toks := []lexer.Token{foo, arrow, foo}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{openParen, foo, arrow, foo, closeParen}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, arrow, openParen, foo, closeParen}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, arrow, foo}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{foo, arrow, foo, foo}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{foo})
//
// toks = []lexer.Token{foo, arrow, openParen, foo, closeParen, foo}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{foo})
//
// toks = []lexer.Token{openParen, foo, closeParen, arrow, openParen, foo, closeParen, foo}
// assertParse(t, toks, stmt(fooExpr, fooExpr), []lexer.Token{foo})
//
// fooTupExpr := Expr{Actual: Tuple{fooExpr, fooExpr}}
// toks = []lexer.Token{foo, arrow, openParen, foo, comma, foo, closeParen, foo}
// assertParse(t, toks, stmt(fooExpr, fooTupExpr), []lexer.Token{foo})
//
// toks = []lexer.Token{foo, comma, foo, arrow, foo}
// assertParse(t, toks, stmt(fooTupExpr, fooExpr), []lexer.Token{})
//
// toks = []lexer.Token{openParen, foo, comma, foo, closeParen, arrow, foo}
// assertParse(t, toks, stmt(fooTupExpr, fooExpr), []lexer.Token{})
//}
//
//func TestParseBlock(t *T) {
// stmt := func(in, to Expr) Expr {
// return Expr{Actual: Statement{In: in, To: to}}
// }
// block := func(stmts ...Expr) Expr {
// return Expr{Actual: Block(stmts)}
// }
//
// foo := lexer.Token{TokenType: lexer.Identifier, Val: "foo"}
// fooExpr := Expr{Actual: Identifier("foo")}
//
// toks := []lexer.Token{openCurly, foo, arrow, foo, closeCurly}
// assertParse(t, toks, block(stmt(fooExpr, fooExpr)), []lexer.Token{})
//
// toks = []lexer.Token{openCurly, foo, arrow, foo, closeCurly, foo}
// assertParse(t, toks, block(stmt(fooExpr, fooExpr)), []lexer.Token{foo})
//
// toks = []lexer.Token{openCurly, foo, arrow, foo, openParen, foo, arrow, foo, closeParen, closeCurly, foo}
// assertParse(t, toks, block(stmt(fooExpr, fooExpr), stmt(fooExpr, fooExpr)), []lexer.Token{foo})
//
// toks = []lexer.Token{openCurly, foo, arrow, foo, openParen, foo, arrow, foo, closeParen, closeCurly, foo}
// assertParse(t, toks, block(stmt(fooExpr, fooExpr), stmt(fooExpr, fooExpr)), []lexer.Token{foo})
//}