1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
|
package tuigen
import (
"strings"
"testing"
)
func TestLexer_ReadGoExpr_CharLiteralsAndErrors(t *testing.T) {
type tc struct {
input string
wantLiteral string
wantType TokenType
wantErr string
}
tests := map[string]tc{
"char literal": {
input: "{x == 'a'}",
wantLiteral: "x == 'a'",
wantType: TokenGoExpr,
},
"escaped char literal": {
input: `{x == '\''}`,
wantLiteral: `x == '\''`,
wantType: TokenGoExpr,
},
"newline escape char": {
input: `{sep == '\n'}`,
wantLiteral: `sep == '\n'`,
wantType: TokenGoExpr,
},
"string with escapes": {
input: `{s == "a\"b"}`,
wantLiteral: `s == "a\"b"`,
wantType: TokenGoExpr,
},
"braces inside string ignored": {
input: `{f("}")}`,
wantLiteral: `f("}")`,
wantType: TokenGoExpr,
},
"braces inside raw string ignored": {
input: "{f(`}`)}",
wantLiteral: "f(`}`)",
wantType: TokenGoExpr,
},
"unterminated expression": {
input: "{x + y",
wantType: TokenError,
wantErr: "unterminated Go expression: unmatched '{'",
},
"unmatched parentheses warning": {
input: "{f(}",
wantLiteral: "f(",
wantType: TokenGoExpr,
wantErr: "unmatched parentheses",
},
"unmatched brackets warning": {
input: "{a[}",
wantLiteral: "a[",
wantType: TokenGoExpr,
wantErr: "unmatched brackets",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
brace := l.Next()
if brace.Type != TokenLBrace {
t.Fatalf("expected TokenLBrace, got %v", brace.Type)
}
tok := l.ReadGoExpr()
if tok.Type != tt.wantType {
t.Errorf("token type = %v, want %v", tok.Type, tt.wantType)
}
if tt.wantType == TokenGoExpr && tok.Literal != tt.wantLiteral {
t.Errorf("literal = %q, want %q", tok.Literal, tt.wantLiteral)
}
if tt.wantErr != "" {
err := l.Errors().Err()
if err == nil {
t.Fatalf("expected lexer error containing %q, got none", tt.wantErr)
}
if !strings.Contains(err.Error(), tt.wantErr) {
t.Errorf("error = %q, want it to contain %q", err.Error(), tt.wantErr)
}
}
})
}
}
func TestLexer_PeekToken(t *testing.T) {
l := NewLexer("test.gsx", "templ Foo()")
peeked := l.PeekToken()
if peeked.Type != TokenTempl {
t.Fatalf("PeekToken type = %v, want TokenTempl", peeked.Type)
}
next := l.Next()
if next.Type != peeked.Type || next.Literal != peeked.Literal {
t.Errorf("Next after Peek = (%v, %q), want (%v, %q)",
next.Type, next.Literal, peeked.Type, peeked.Literal)
}
ident := l.Next()
if ident.Type != TokenIdent || ident.Literal != "Foo" {
t.Errorf("second token = (%v, %q), want (TokenIdent, \"Foo\")", ident.Type, ident.Literal)
}
}
func TestLexer_ReadBalancedBraces(t *testing.T) {
type tc struct {
input string
want string
wantErr string
hasError bool
}
tests := map[string]tc{
"simple": {
input: "{x + y}",
want: "x + y",
},
"nested braces": {
input: "{if a { b } else { c }}",
want: "if a { b } else { c }",
},
"string with brace": {
input: `{"}"}`,
want: `"}"`,
},
"raw string with brace": {
input: "{`}`}",
want: "`}`",
},
"char literal with brace": {
input: "{'}'}",
want: "'}'",
},
"not at brace": {
input: "x{y}",
hasError: true,
wantErr: "expected '{' at start of balanced braces",
},
"unterminated": {
input: "{x",
hasError: true,
wantErr: "unterminated braces: unmatched '{'",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
got, err := l.ReadBalancedBraces()
if tt.hasError {
if err == nil {
t.Fatalf("expected error containing %q, got nil (content %q)", tt.wantErr, got)
}
if !strings.Contains(err.Error(), tt.wantErr) {
t.Errorf("error = %q, want it to contain %q", err.Error(), tt.wantErr)
}
return
}
if err != nil {
t.Fatalf("unexpected error: %v", err)
}
if got != tt.want {
t.Errorf("content = %q, want %q", got, tt.want)
}
})
}
}
func TestLexer_ReadUntilBrace(t *testing.T) {
type tc struct {
input string
want string
}
tests := map[string]tc{
"stops at brace": {
input: "x > 5 {",
want: "x > 5 ",
},
"stops at newline": {
input: "cond\n{",
want: "cond",
},
"stops at EOF": {
input: "a && b",
want: "a && b",
},
"skips leading whitespace": {
input: " y == 2 {",
want: "y == 2 ",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
got := l.ReadUntilBrace()
if got != tt.want {
t.Errorf("ReadUntilBrace() = %q, want %q", got, tt.want)
}
})
}
}
func TestLexer_ReadBalancedBracesFrom_Errors(t *testing.T) {
type tc struct {
input string
startPos int
wantErr string
}
tests := map[string]tc{
"negative start": {
input: "{x}",
startPos: -1,
wantErr: "invalid start position",
},
"start beyond source": {
input: "{x}",
startPos: 10,
wantErr: "invalid start position",
},
"start not at brace": {
input: "a{x}",
startPos: 0,
wantErr: "invalid start position",
},
"unterminated braces": {
input: "{x",
startPos: 0,
wantErr: "unterminated braces",
},
"unterminated with escape in string": {
input: `{"a\"`,
startPos: 0,
wantErr: "unterminated braces",
},
"unterminated with char escape": {
input: `{'\n`,
startPos: 0,
wantErr: "unterminated braces",
},
}
for name, tt := range tests {
t.Run(name, func(t *testing.T) {
l := NewLexer("test.gsx", tt.input)
_, err := l.ReadBalancedBracesFrom(tt.startPos)
if err == nil {
t.Fatalf("expected error containing %q, got nil", tt.wantErr)
}
if !strings.Contains(err.Error(), tt.wantErr) {
t.Errorf("error = %q, want it to contain %q", err.Error(), tt.wantErr)
}
})
}
}
|