typescript-definitions-derive 0.1.10

serde support for exporting Typescript definitions
Documentation
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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
// Copyright 2019 Ian Castleden
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use super::patch::{eq, nl};
use super::{filter_visible, ident_from_str, ParseContext, QuoteMaker};
use proc_macro2::Literal;
use quote::quote;
use serde_derive_internals::{ast, ast::Variant, attr::EnumTag};
const CONTENT: &str = "fields"; // default content tag
                                // const TAG: &'static str = "kind"; // default tag tag

struct TagInfo<'a> {
    tag: Option<&'a str>,
    content: Option<&'a str>,
    untagged: bool,
}
impl<'a> ParseContext<'_> {
    pub(crate) fn derive_enum(
        &self,
        variants: &[ast::Variant<'a>],
        ast_container: &ast::Container,
    ) -> QuoteMaker {
        let taginfo = match ast_container.attrs.tag() {
            EnumTag::Internal { tag, .. } => TagInfo {
                tag: Some(tag),
                content: None,
                untagged: false,
            },
            EnumTag::Adjacent { tag, content, .. } => TagInfo {
                tag: Some(tag),
                content: Some(&content),
                untagged: false,
            },
            EnumTag::External => TagInfo {
                tag: None,
                content: None,
                untagged: false,
            },
            EnumTag::None => TagInfo {
                tag: None,
                content: None,
                untagged: true,
            },
        };

        // check for #[serde(skip)]
        let mut skip_variants: Vec<&ast::Variant<'a>> = Vec::with_capacity(variants.len());
        for v in variants {
            if v.attrs.skip_serializing() {
                continue;
            }
            skip_variants.push(v);
        }

        let mut is_enum = true;
        for v in &skip_variants {
            match v.style {
                ast::Style::Unit => continue,
                _ => {
                    is_enum = false;
                    break;
                }
            }
        }
        if is_enum {
            let v = &skip_variants
                .iter()
                .map(|v| v.attrs.name().serialize_name()) // use serde name instead of v.ident
                .collect::<Vec<_>>();
            let k = v.iter().map(|v| ident_from_str(&v)).collect::<Vec<_>>();
            let verify = if self.gen_guard {
                let obj = &self.arg_name;
                let o = (0..v.len()).map(|_| obj.clone());
                let eq = (0..v.len()).map(|_| eq());

                Some(quote!(
                    {

                        if (!((#(#o #eq #v)||*))) return false;
                        return true;
                    }
                ))
            } else {
                None
            };
            return QuoteMaker {
                body: quote! ( { #(#k = #v),* } ),
                verify,
                is_enum: true,
            };
        }

        let content = skip_variants
            .iter()
            .map(|variant| match variant.style {
                ast::Style::Struct => {
                    self.derive_struct_variant(&taginfo, variant, &variant.fields, ast_container)
                }
                ast::Style::Newtype => {
                    self.derive_newtype_variant(&taginfo, variant, &variant.fields[0])
                }
                ast::Style::Tuple => self.derive_tuple_variant(&taginfo, variant, &variant.fields),
                ast::Style::Unit => self.derive_unit_variant(&taginfo, variant),
            })
            .collect::<Vec<_>>();
        // OK generate A | B | C etc
        let newl = nl();
        let body = content.iter().map(|q| q.body.clone());
        let nl = content.iter().map(|_| quote!(#newl));
        let verify = if self.gen_guard {
            let v = content.iter().map(|q| q.verify.clone().unwrap());

            let obj = &self.arg_name;
            let nl = content.iter().map(|_| quote!(#newl));
            // obj can't be null or undefined
            Some(quote!(
                {
                    if (#obj == undefined) return false;

                    #( #nl if ( ( () => #v )() ) return true; )*
                    #newl return false;
                }
            ))
        } else {
            None
        };
        QuoteMaker {
            body: quote! ( #( #nl | #body)* ),
            verify,
            is_enum: false,
        }
    }
    fn derive_unit_variant(&self, taginfo: &TagInfo, variant: &Variant) -> QuoteMaker {
        let variant_name = variant.attrs.name().serialize_name(); // use serde name instead of variant.ident
        let eq = eq();

        if taginfo.tag.is_none() {
            let verify = if self.gen_guard {
                let obj = &self.arg_name;
                Some(quote!(
                    {
                        return #obj #eq #variant_name;
                    }
                ))
            } else {
                None
            };
            return QuoteMaker {
                body: quote!(#variant_name),
                verify,
                is_enum: false,
            };
        }
        let tag = ident_from_str(taginfo.tag.unwrap());
        let verify = if self.gen_guard {
            let obj = &self.arg_name;
            Some(quote!(
                {
                    return #obj.#tag #eq #variant_name;
                }
            ))
        } else {
            None
        };
        QuoteMaker {
            body: quote! (
                { #tag: #variant_name }
            ),
            verify,
            is_enum: false,
        }
    }

    fn derive_newtype_variant(
        &self,
        taginfo: &TagInfo,
        variant: &Variant,
        field: &ast::Field<'a>,
    ) -> QuoteMaker {
        if field.attrs.skip_serializing() {
            return self.derive_unit_variant(taginfo, variant);
        };
        let ty = self.field_to_ts(field);
        let variant_name = self.variant_name(variant);
        let obj = &self.arg_name;

        if taginfo.tag.is_none() {
            if taginfo.untagged {
                let verify = if self.gen_guard {
                    let v = self.verify_type(&obj, field);

                    Some(quote!( { #v; return true }))
                } else {
                    None
                };
                return QuoteMaker {
                    body: quote! ( #ty ),
                    verify,
                    is_enum: false,
                };
            };
            let tag = ident_from_str(&variant_name);

            let verify = if self.gen_guard {
                let v = quote!(v);
                let verify = self.verify_type(&v, field);
                let eq = eq();
                // #ty might be a Option None and therefore null
                // OTOH #verify might be assuming not null and not undefined
                Some(quote!(
                    {
                        const v = #obj.#tag;
                        if (v #eq undefined) return false;
                        #verify;
                        return true;
                    }
                ))
            } else {
                None
            };
            return QuoteMaker {
                body: quote! (
                    { #tag : #ty }

                ),
                verify,
                is_enum: false,
            };
        };
        let tag = ident_from_str(taginfo.tag.unwrap());

        let content = if let Some(content) = taginfo.content {
            ident_from_str(&content)
        } else {
            ident_from_str(CONTENT) // should not get here...
        };

        let verify = if self.gen_guard {
            let eq = eq();
            let verify = self.verify_type(&quote!(val), field);
            Some(quote!(
            {
                if (!(#obj.#tag #eq #variant_name)) return false;
                const val = #obj.#content;
                if (val #eq undefined) return false;
                #verify;
                return true;
            }))
        } else {
            None
        };
        QuoteMaker {
            body: quote! (
                { #tag: #variant_name; #content: #ty }
            ),
            verify,
            is_enum: false,
        }
    }

    fn derive_struct_variant(
        &self,
        taginfo: &TagInfo,
        variant: &Variant,
        fields: &[ast::Field<'a>],
        ast_container: &ast::Container,
    ) -> QuoteMaker {
        use std::collections::HashSet;
        let fields = filter_visible(fields);
        if fields.is_empty() {
            return self.derive_unit_variant(taginfo, variant);
        }

        self.check_flatten(&fields, ast_container);

        let contents = self.derive_fields(&fields).collect::<Vec<_>>();
        let variant_name = self.variant_name(variant);

        let last = nl();
        let nl = contents.iter().map(|_| quote!(#last));
        if taginfo.tag.is_none() {
            if taginfo.untagged {
                let verify = if self.gen_guard {
                    let verify = self.verify_fields(&self.arg_name, &fields);

                    Some(quote!(
                        {
                            #( #nl #verify;)*
                            #last return true;
                        }
                    ))
                } else {
                    None
                };
                return QuoteMaker {
                    body: quote! (
                        { #(#contents);* }
                    ),
                    verify,
                    is_enum: false,
                };
            };
            let v = &quote!(v);
            let tag = ident_from_str(&variant_name);
            let verify = if self.gen_guard {
                let obj = &self.arg_name;
                let verify = self.verify_fields(&v, &fields);
                Some(quote!(
                    {
                        const v = #obj.#tag;
                        if (v == undefined) return false;
                        #(#nl #verify;)*
                        #last return true;
                    }
                ))
            } else {
                None
            };
            return QuoteMaker {
                body: quote! (
                    { #tag : { #(#contents);* }  }
                ),
                verify,
                is_enum: false,
            };
        }
        let tag_str = taginfo.tag.unwrap();
        let tag = ident_from_str(tag_str);

        if let Some(content) = taginfo.content {
            let content = ident_from_str(&content);

            let verify = if self.gen_guard {
                let obj = &self.arg_name;
                let v = quote!(v);
                let verify = self.verify_fields(&v, &fields);
                let eq = eq();
                Some(quote!(
                {
                    if (!(#obj.#tag #eq #variant_name)) return false;
                    const v = #obj.#content;
                    if (v == undefined) return false;
                    #(#nl #verify;)*
                    #last return true;
                }
                ))
            } else {
                None
            };
            QuoteMaker {
                body: quote! (
                    { #tag: #variant_name; #content: { #(#contents);* } }

                ),
                verify,
                is_enum: false,
            }
        } else {
            if let Some(ref cx) = self.ctxt {
                let fnames = fields
                    .iter()
                    .map(|field| field.attrs.name().serialize_name())
                    .collect::<HashSet<_>>();
                if fnames.contains(tag_str) {
                    cx.error(format!(
                        "clash with field in \"{}::{}\". \
                         Maybe use a #[serde(content=\"...\")] attribute.",
                        ast_container.ident, variant_name
                    ));
                }
            };
            let verify = if self.gen_guard {
                let obj = &self.arg_name;
                let verify = self.verify_fields(&obj, &fields);
                let eq = eq();
                Some(quote!(
                {
                    if (!(#obj.#tag #eq #variant_name)) return false;
                    #(#nl #verify;)*
                    #last return true;
                }
                ))
            } else {
                None
            };
            QuoteMaker {
                body: quote! (
                    { #tag: #variant_name; #(#contents);* }
                ),
                verify,
                is_enum: false,
            }
        }
    }

    #[inline]
    fn variant_name(&self, variant: &Variant) -> String {
        variant.attrs.name().serialize_name() // use serde name instead of variant.ident
    }

    fn derive_tuple_variant(
        &self,
        taginfo: &TagInfo,
        variant: &Variant,
        fields: &[ast::Field<'a>],
    ) -> QuoteMaker {
        let variant_name = self.variant_name(variant);
        let fields = filter_visible(fields);
        let contents = self.derive_field_tuple(&fields);

        if taginfo.tag.is_none() {
            if taginfo.untagged {
                let verify = if self.gen_guard {
                    let obj = &self.arg_name;
                    let verify = self.verify_field_tuple(&obj, &fields);
                    let eq = eq();
                    let len = Literal::usize_unsuffixed(fields.len());

                    Some(quote!({
                        if (!Array.isArray(#obj) || !(#obj.length #eq #len)) return false;
                        #(#verify;)*
                        return true;
                    }))
                } else {
                    None
                };
                return QuoteMaker {
                    body: quote! (
                     [ #(#contents),* ]
                    ),
                    verify,
                    is_enum: false,
                };
            }
            let tag = ident_from_str(&variant_name);
            let verify = if self.gen_guard {
                let obj = &self.arg_name;
                let v = quote!(v);
                let verify = self.verify_field_tuple(&v, &fields);
                let len = Literal::usize_unsuffixed(fields.len());
                let eq = eq();
                Some(quote!({
                    const v = #obj.#tag;
                    if (!Array.isArray(v) || !(v.length #eq #len)) return false;
                    #(#verify;)*
                    return true;
                }))
            } else {
                None
            };
            return QuoteMaker {
                body: quote! (
                 { #tag : [ #(#contents),* ] }

                ),
                verify,
                is_enum: false,
            };
        };

        let tag = ident_from_str(taginfo.tag.unwrap());
        let content = if let Some(content) = taginfo.content {
            ident_from_str(&content)
        } else {
            ident_from_str(CONTENT)
        };

        let verify = if self.gen_guard {
            let eq = eq();
            let obj = &self.arg_name;
            let v = quote!(v);
            let verify = self.verify_field_tuple(&v, &fields);
            let len = Literal::usize_unsuffixed(fields.len());
            Some(quote!({
                if (!(#obj.#tag #eq #variant_name)) return false;
                const v = #obj.#content;
                if (!Array.isArray(v) || !(v.length #eq #len)) return false;
                #(#verify;)*
                return true;
            }))
        } else {
            None
        };
        QuoteMaker {
            body: quote! (
            { #tag: #variant_name; #content : [ #(#contents),* ] }
            ),
            verify,
            is_enum: false,
        }
    }
}