/
parser_test.go
140 lines (110 loc) · 2.35 KB
/
parser_test.go
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package lex_test
import (
"fmt"
"testing"
"github.com/otm/lex"
)
func TestParse(t *testing.T) {
s := `
--comment
--comment2
function test
--comment3
--[[1
Multi2
3]]
var test = 32
--comment4
test = 1
`
expected := []struct {
comment string
line int
}{
{comment: "comment", line: 2},
{comment: "comment2", line: 4},
{comment: "comment3", line: 7},
{comment: `1
Multi2
3`, line: 11},
{comment: "comment4", line: 14},
}
comments := Parse(s)
if len(comments) != len(expected) {
t.Errorf("Not asserting all. Comments: %v, expected: %v", len(comments), len(expected))
return
}
for i, comment := range comments {
if comment.Value != expected[i].comment {
t.Errorf("Comment value incorrect:\ngot: %v\nexpexted: %v", expected[i].comment, comment.Value)
}
if comment.Row != expected[i].line {
t.Errorf("Comment line incorrect:\ngot: %v\nexpexted: %v", expected[i].line, comment.Row)
}
}
}
func TestStringer(t *testing.T) {
tok := lex.Token{
Type: TSLComment,
Value: "---",
Start: 5,
Width: 6,
Line: 1,
}
expected := "[TokenType(4) 1:5+6] <--->"
got := tok.String()
if got != expected {
t.Errorf("Incurrect stringer:\ngot: %v\nexpected: %v", got, expected)
}
}
const (
MinusSign = "--"
LeftBracket string = "[["
RightBracket string = "]]"
)
const (
TSLComment lex.TokenType = iota + lex.TokenTypes
TRMLComment
TLMLComment
TComment
)
// Comment contains information about a comment
type Comment struct {
Value string
Row int
}
// ErrNoMatch is returned when no matching comment can be found for a row
var ErrNoMatch = fmt.Errorf("No matching comment")
// Comments that has been parsed
type Comments []Comment
// Get returns a Comment or an error
func (c Comments) Get(row int) (*Comment, error) {
result := &Comment{Row: row}
for i := len(c) - 1; i >= 0; i-- {
if c[i].Row != row {
continue
}
result.Value = result.Value + c[i].Value
row--
}
if result.Value == "" {
return nil, ErrNoMatch
}
return result, nil
}
// Parse parses a string
func Parse(str string) Comments {
var token lex.Token
comments := make(Comments, 0)
l := lex.NewLexer("", str, LexBegin)
for {
token = l.NextToken()
if token.Type == TComment {
comment := Comment{Value: token.Value, Row: token.Line}
comments = append(comments, comment)
}
if token.Type == lex.TEOF {
return comments
}
}
}