verify parse trees pl0x

lex.go

@@ -41,8 +41,10 @@ func (t tokenType) String() string {
 		return "t_object_separator"
 	case t_object_end:
 		return "t_object_end"
-	case t_number:
+	case t_real_number:
-		return "t_number"
+		return "t_real_number"
+	case t_imaginary_number:
+		return "t_imaginary_number"
 	default:
 		panic(fmt.Sprintf("unknown token type: %v", t))
 	}
@@ -62,7 +64,8 @@ const (
 	t_object_start                      // {
 	t_object_end                        // }
 	t_object_separator                  // :
-	t_number                            // a number
+	t_real_number                       // a number
+	t_imaginary_number                  // an imaginary number
 )
 
 type stateFn func(*lexer) stateFn
@@ -321,13 +324,17 @@ func lexNumber(l *lexer) stateFn {
 		l.accept("+-")
 		l.acceptRun("0123456789")
 	}
-	l.accept("i")
+	imaginary := l.accept("i")
 	r := l.next()
 	if isAlphaNumeric(r) {
 		return lexErrorf("unexpected alphanum in lexNumber: %c", r)
 	}
 	l.unread(r)
-	l.emit(t_number)
+	if imaginary {
+		l.emit(t_imaginary_number)
+	} else {
+		l.emit(t_real_number)
+	}
 	return lexRoot
 }
 

lex_test.go

@@ -64,38 +64,39 @@ var primitivesTests = []struct {
 		{t_list_separator, ","},
 		{t_object_end, "}"},
 	}},
-	{`0`, []token{{t_number, "0"}}},
+	{`0`, []token{{t_real_number, "0"}}},
-	{`-0`, []token{{t_number, "-0"}}},
+	{`-0`, []token{{t_real_number, "-0"}}},
-	{`+0`, []token{{t_number, "+0"}}},
+	{`+0`, []token{{t_real_number, "+0"}}},
-	{`+125`, []token{{t_number, "+125"}}},
+	{`+125`, []token{{t_real_number, "+125"}}},
-	{`-125`, []token{{t_number, "-125"}}},
+	{`-125`, []token{{t_real_number, "-125"}}},
-	{`.0`, []token{{t_number, ".0"}}},
+	{`.0`, []token{{t_real_number, ".0"}}},
-	{`15`, []token{{t_number, "15"}}},
+	{`15`, []token{{t_real_number, "15"}}},
-	{`0x0`, []token{{t_number, "0x0"}}},
+	{`0x0`, []token{{t_real_number, "0x0"}}},
-	{`0xa`, []token{{t_number, "0xa"}}},
+	{`0xa`, []token{{t_real_number, "0xa"}}},
-	{`0xc0dea5cf`, []token{{t_number, "0xc0dea5cf"}}},
+	{`0xc0dea5cf`, []token{{t_real_number, "0xc0dea5cf"}}},
-	{`12.345`, []token{{t_number, "12.345"}}},
+	{`12.345`, []token{{t_real_number, "12.345"}}},
-	{`12.345 name`, []token{{t_number, "12.345"}, {t_name, "name"}}},
+	{`12.345 name`, []token{{t_real_number, "12.345"}, {t_name, "name"}}},
 	{`[12.345]`, []token{
 		{t_list_start, "["},
-		{t_number, "12.345"},
+		{t_real_number, "12.345"},
 		{t_list_end, "]"},
 	}},
 	{`[1, 2, 3]`, []token{
 		{t_list_start, "["},
-		{t_number, "1"},
+		{t_real_number, "1"},
 		{t_list_separator, ","},
-		{t_number, "2"},
+		{t_real_number, "2"},
 		{t_list_separator, ","},
-		{t_number, "3"},
+		{t_real_number, "3"},
 		{t_list_end, "]"},
 	}},
-	// an imaginary number generates two lexemes; one for its real component,
+	{`1i`, []token{{t_imaginary_number, "1i"}}},
+	// a complex number generates two lexemes; one for its real component,
 	// and one for its imaginary component.
-	{`1+2i`, []token{{t_number, "1"}, {t_number, "+2i"}}},
+	{`1+2i`, []token{{t_real_number, "1"}, {t_imaginary_number, "+2i"}}},
-	{`1e9`, []token{{t_number, "1e9"}}},
+	{`1e9`, []token{{t_real_number, "1e9"}}},
-	{`1e+9`, []token{{t_number, "1e+9"}}},
+	{`1e+9`, []token{{t_real_number, "1e+9"}}},
-	{`1E-9`, []token{{t_number, "1E-9"}}},
+	{`1E-9`, []token{{t_real_number, "1E-9"}}},
 }
 
 func TestLexPrimities(t *testing.T) {

node.go

@@ -40,8 +40,7 @@ func (n *rootNode) parse(p *parser) error {
 		case t_eof:
 			return nil
 		case t_comment:
-			shit := commentNode(t.s)
+			n.addChild(&commentNode{t.s})
-			n.addChild(&shit)
 		case t_name:
 			nn := &assignmentNode{name: t.s}
 			if err := nn.parse(p); err != nil {
@@ -74,18 +73,20 @@ func (n *rootNode) String() string {
 	return buf.String()
 }
 
-type commentNode string
+type commentNode struct {
+	body string
+}
 
-func (n commentNode) Type() nodeType {
+func (n *commentNode) Type() nodeType {
 	return n_comment
 }
 
-func (n commentNode) parse(p *parser) error {
+func (n *commentNode) parse(p *parser) error {
 	return nil
 }
 
-func (n commentNode) String() string {
+func (n *commentNode) String() string {
-	return fmt.Sprintf("{comment: %s}", string(n))
+	return fmt.Sprintf("{comment: %s}", n.body)
 }
 
 type assignmentNode struct {
@@ -93,7 +94,7 @@ type assignmentNode struct {
 	value interface{}
 }
 
-func (n assignmentNode) Type() nodeType {
+func (n *assignmentNode) Type() nodeType {
 	return n_assignment
 }
 
@@ -118,44 +119,8 @@ func (n *assignmentNode) parse(p *parser) error {
 }
 
 func (n *assignmentNode) String() string {
-	return fmt.Sprintf("{assign: name=%s, val=%s}", n.name, n.value)
+	return fmt.Sprintf("{assign: name=%s, val=%v}", n.name, n.value)
-}
-
-type list struct {
-	head *listElem
-	tail *listElem
-}
-
-func (l list) String() string {
-	var buf bytes.Buffer
-	buf.WriteString("[")
-	for e := l.head; e != nil; e = e.next {
-		fmt.Fprintf(&buf, "%v, ", e.value)
-	}
-	if buf.Len() > 1 {
-		buf.Truncate(buf.Len() - 2)
-	}
-	buf.WriteString("]")
-	return buf.String()
-}
-
-func (l *list) append(v interface{}) {
-	e := listElem{value: v}
-	if l.head == nil {
-		l.head = &e
-	}
-
-	if l.tail != nil {
-		l.tail.next = &e
-		e.prev = l.tail
-	}
-	l.tail = &e
-}
-
-type listElem struct {
-	value interface{}
-	prev  *listElem
-	next  *listElem
 }
 
+type list []interface{}
 type object map[string]interface{}

parse.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"io"
+	"strconv"
 )
 
 const ()
@@ -78,8 +79,11 @@ func (p *parser) parseValue() (interface{}, error) {
 			return nil, fmt.Errorf("parse error: unexpected eof when looking for value")
 		case t_string:
 			return t.s, nil
+		case t_real_number, t_imaginary_number:
+			p.unread(t)
+			return p.number()
 		case t_list_start:
-			return p.parseList(new(list))
+			return p.parseList(make(list, 0, 4))
 		case t_object_start:
 			return p.parseObject(make(object))
 		default:
@@ -88,7 +92,7 @@ func (p *parser) parseValue() (interface{}, error) {
 	}
 }
 
-func (p *parser) parseList(l *list) (*list, error) {
+func (p *parser) parseList(l list) (list, error) {
 	if p.peek().t == t_list_end {
 		p.next()
 		return l, nil
@@ -97,7 +101,7 @@ func (p *parser) parseList(l *list) (*list, error) {
 	if v, err := p.parseValue(); err != nil {
 		return nil, err
 	} else {
-		l.append(v)
+		l = append(l, v)
 	}
 
 	switch t := p.next(); t.t {
@@ -139,3 +143,31 @@ func (p *parser) parseObject(obj object) (object, error) {
 		return nil, fmt.Errorf("parse error: unexpected %v token while scanning for object", t.t)
 	}
 }
+
+func (p *parser) number() (interface{}, error) {
+	t := p.next()
+	if t.t != t_real_number {
+		return nil, fmt.Errorf("unexpected %s token while parsing number", t.t)
+	}
+
+	if p.peek().t == t_imaginary_number {
+		var c complex128
+		s := t.s + p.next().s
+		if _, err := fmt.Sscan(s, &c); err != nil {
+			return nil, fmt.Errorf("ungood imaginary number format %s: %s", s, err)
+		}
+		return c, nil
+	}
+
+	i, err := strconv.ParseInt(t.s, 0, 64)
+	if err == nil {
+		return int(i), nil
+	}
+
+	f, err := strconv.ParseFloat(t.s, 64)
+	if err == nil {
+		return f, nil
+	}
+
+	return nil, fmt.Errorf("this token broke the number parser: %s", t)
+}

parse_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"reflect"
 	"strings"
 	"testing"
 )
@@ -16,7 +17,7 @@ var parseTests = []parseTest{
 		source: `# just a comment`,
 		root: &rootNode{
 			children: []node{
-				commentNode(" just a comment"),
+				&commentNode{" just a comment"},
 			},
 		},
 	},
@@ -24,46 +25,65 @@ var parseTests = []parseTest{
 		source: `name = "jordan"`,
 		root: &rootNode{
 			children: []node{
-				&assignmentNode{
+				&assignmentNode{"name", "jordan"},
-					name:  "name",
-					value: "jordan",
-				},
 			},
 		},
 	},
 	{
 		source: `
-        first_name = "jordan"
+        hostname = "jordanorelli.com"
-        last_name = "orelli"
+	    port = 9000
+        freq = 1e9
+        duty = 0.2
+        neg = -2
+        neg2 = -2.3
+        imag = 1+2i
 	    `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"hostname", "jordanorelli.com"},
+				&assignmentNode{"port", 9000},
+				&assignmentNode{"freq", 1e9},
+				&assignmentNode{"duty", 0.2},
+				&assignmentNode{"neg", -2},
+				&assignmentNode{"neg2", -2.3},
+				&assignmentNode{"imag", 1 + 2i},
+			},
 		},
-	{
-		source: `
-        # personal info
-        first_name = "jordan"
-        last_name = "orelli"
-        `,
-		root: &rootNode{},
 	},
 	{
 		source: `
 	       first_name = "jordan" # yep, that's my name
 	       last_name = "orelli"  # comments should be able to follow other shit
 	       `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"first_name", "jordan"},
+				&commentNode{" yep, that's my name"},
+				&assignmentNode{"last_name", "orelli"},
+				&commentNode{" comments should be able to follow other shit"},
+			},
+		},
 	},
 	{
 		source: `
 	       heroes = ["lina", "cm"]
 	       `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"heroes", list{"lina", "cm"}},
+			},
+		},
 	},
 	{
 		source: `
 	       nested = [["one", "two"], ["three", "four"]]
 	       `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"nested", list{list{"one", "two"}, list{"three", "four"}}},
+			},
+		},
 	},
 	{
 		source: `
@@ -72,28 +92,46 @@ var parseTests = []parseTest{
 	           ["three", "four"],
 	       ]
 	       `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"nested", list{list{"one", "two"}, list{"three", "four"}}},
+			},
+		},
 	},
 	{
 		source: `
 	    admin = {first_name: "jordan", last_name: "orelli"}
 	    `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"admin", object{
+					"first_name": "jordan",
+					"last_name":  "orelli",
+				}},
+			},
+		},
 	},
 	{
 		source: `
 	       http = {
-            port: "9000",
+	           port: 9000,
 	           routes: "/path/to/some/file",
 	       }
 	       `,
-		root: &rootNode{},
+		root: &rootNode{
+			children: []node{
+				&assignmentNode{"http", object{
+					"port":   9000,
+					"routes": "/path/to/some/file",
+				}},
+			},
+		},
 	},
 }
 
 type parseTest struct {
 	source string
-	root   *rootNode
+	root   node
 }
 
 func (p *parseTest) run(t *testing.T) {
@@ -103,10 +141,11 @@ func (p *parseTest) run(t *testing.T) {
 		t.Errorf("parse error: %v", err)
 		return
 	}
-	if n.Type() != n_root {
+	if !reflect.DeepEqual(p.root, n) {
-		t.Errorf("we expected a root node object, but instead we got: %s", n.Type())
+		t.Errorf("trees are not equal.  expected:\n%v\nsaw:\n%v", p.root, n)
+	} else {
+		t.Logf("OK trees are equal: %v = %v", p.root, n)
 	}
-	t.Logf("output: %v", n)
 }
 
 func TestParse(t *testing.T) {