aboutsummaryrefslogtreecommitdiff
path: root/ast/ast.go
blob: 00b10281f1be92c984bc0a80d4882d15edd51792 (plain)
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
package ast

import (
	"encoding/json"
	"fmt"
	"strings"

	"usebox.net/micro-lang/tokens"
)

// for JSON
type node struct {
	Type   string `json:"type"`
	Object any    `json:"object"`
}

var (
	TypeNumber = Type{Value: tokens.Token{Id: tokens.TNumber}, Const: true}
	TypeBool   = Type{Value: tokens.Token{Id: tokens.TBool}, Const: true}
	TypeString = Type{Value: tokens.Token{Id: tokens.TString}, Const: true}
	TypeArray  = Type{Value: tokens.Token{Id: tokens.TArray}, Const: true}
	TypeNone   = Type{Value: tokens.Token{Id: tokens.None}, Const: true}
)

type Type struct {
	Value  tokens.Token `json:"value"`
	Params []Type       `json:"params,omitempty"`
	Ret    *Type        `json:"type,omitempty"`
	Len    *int         `json:"len,omitempty"`
	Const  bool         `json:"const"`
	Inst   bool         `json:"-"`
	Ref    bool         `json:"-"`
}

func NewStructType(name tokens.Token) *Type {
	return &Type{Value: tokens.Token{Id: tokens.TStruct, Value: name.Value, Loc: name.Loc}}
}

func NewFuncType(name tokens.Token, params []Type, ret *Type) *Type {
	return &Type{Value: tokens.Token{Id: tokens.TFunc, Loc: name.Loc}, Params: params, Ret: ret}
}

func (t Type) MarshalJSON() ([]byte, error) {
	type Object Type
	return json.MarshalIndent(node{"type", Object(t)}, "", "  ")
}

func (t Type) String() string {
	if t.Value.Id == tokens.TFunc {
		var b = strings.Builder{}
		b.WriteString(t.Value.Id.String())
		if t.Params == nil {
			// not specified (e.g. println)
			b.WriteString(" (...)")
		} else if len(t.Params) > 0 {
			b.WriteString(" (")
			for n, param := range t.Params {
				b.WriteString(param.String())
				if n < len(t.Params)-1 {
					b.WriteString(", ")
				}
			}
			b.WriteString(")")
		} else {
			b.WriteString(" ()")
		}

		if t.Ret != nil {
			b.WriteString(" ")
			b.WriteString(t.Ret.String())
		}

		return b.String()
	}

	if t.Value.Id == tokens.TStruct {
		return fmt.Sprintf("struct %s", t.Value.Value)
	}

	if t.Value.Id == tokens.TArray {
		if t.Ret != nil {
			return fmt.Sprintf("array [%d]%s", *t.Len, t.Ret.String())
		}
		return "array"
	}

	return t.Value.Id.String()
}

func (t Type) Compare(other *Type) bool {
	if other == nil {
		return false
	}
	if t.Value.Id != other.Value.Id {
		return false
	}

	if t.Value.Id == tokens.TArray {
		// this is len accepting any length of array
		if t.Len == nil || other.Len == nil {
			return true
		}
		return *t.Len == *other.Len
	}

	if t.Value.Id == tokens.TStruct {
		return t.Value.Value == other.Value.Value
	}

	if t.Value.Id == tokens.TFunc {
		// func checks
		if len(t.Params) != len(other.Params) {
			return false
		}
		for i := range t.Params {
			if !t.Params[i].Compare(&other.Params[i]) {
				return false
			}
		}
		if t.Ret != nil {
			return t.Ret.Compare(other.Ret)
		}
		return t.Ret == other.Ret
	}

	return true
}

func (t Type) ResolveConst() bool {
	if t.Value.Id == tokens.TArray {
		return t.Ret.Const
	}
	return t.Const
}

type Expr interface {
	Resolve() *Type
}

type ExprList struct {
	Exprs []Expr `json:"exprs"`
}

func (n ExprList) MarshalJSON() ([]byte, error) {
	type Object ExprList
	return json.MarshalIndent(node{"exprlist", Object(n)}, "", "  ")
}

func (n ExprList) Resolve() *Type {
	return n.Exprs[0].Resolve()
}

type Var struct {
	Name  tokens.Token `json:"ident"`
	Type  Type         `json:"type"`
	Initv Expr         `json:"initval,omitempty"`
}

func (n Var) MarshalJSON() ([]byte, error) {
	type Object Var
	return json.MarshalIndent(node{"var", Object(n)}, "", "  ")
}

func (n Var) Resolve() *Type {
	return &n.Type
}

type Variable struct {
	Name  tokens.Token `json:"ident"`
	Index Expr         `json:"index,omitempty"`
	Type  Type         `json:"-"`
}

func (n Variable) MarshalJSON() ([]byte, error) {
	type Object Variable
	return json.MarshalIndent(node{"variable", Object(n)}, "", "  ")
}

func (n Variable) Resolve() *Type {
	if n.Type.Value.Id == tokens.TArray && n.Index != nil {
		return n.Type.Ret
	}
	return &n.Type
}

func (n Variable) String() string {
	if n.Index != nil {
		return fmt.Sprintf("%s[%s]", n.Name.Value, n.Index.Resolve().Value)
	}
	if n.Type.Value.Id == tokens.TStruct {
		return fmt.Sprintf("<struct %s>.%s", n.Type.Value.Value, n.Name.Value)
	}
	return n.Name.String()
}

type Assign struct {
	Left  Expr            `json:"left"`
	Right Expr            `json:"right"`
	Loc   tokens.Location `json:"-"`
}

func (n Assign) MarshalJSON() ([]byte, error) {
	type Object Assign
	return json.MarshalIndent(node{"variable", Object(n)}, "", "  ")
}

func (n Assign) Resolve() *Type {
	return n.Left.Resolve()
}

type Binary struct {
	Left  Expr         `json:"left"`
	Op    tokens.Token `json:"op"`
	Right Expr         `json:"right"`
	Type  *Type
}

func (n Binary) MarshalJSON() ([]byte, error) {
	type Object Binary
	return json.MarshalIndent(node{"binary", Object(n)}, "", "  ")
}

func (n Binary) Resolve() *Type {
	if n.Type != nil {
		return n.Type
	} else {
		return n.Left.Resolve()
	}
}

type Unary struct {
	Op    tokens.Token `json:"op"`
	Right Expr         `json:"expr"`
}

func (n Unary) MarshalJSON() ([]byte, error) {
	type Object Unary
	return json.MarshalIndent(node{"unary", Object(n)}, "", "  ")
}

func (n Unary) Resolve() *Type {
	if n.Op.Id == tokens.TestE {
		return &TypeBool
	}
	return n.Right.Resolve()
}

type Number int64

func (n Number) String() string {
	return fmt.Sprintf("%d", n)
}

func (n Number) Resolve() *Type {
	return &TypeNumber
}

type Literal struct {
	Value  tokens.Token `json:"value"`
	Numval Number       `json:"numval,omitempty"`
	Type   Type         `json:"-"`
}

func (n Literal) MarshalJSON() ([]byte, error) {
	type Object Literal
	return json.MarshalIndent(node{"literal", Object(n)}, "", "  ")
}

func (n Literal) Resolve() *Type {
	return &n.Type
}

type Group struct {
	Expr Expr `json:"expr"`
}

func (n Group) MarshalJSON() ([]byte, error) {
	type Object Group
	return json.MarshalIndent(node{"group", Object(n)}, "", "  ")
}

func (n Group) Resolve() *Type {
	return n.Expr.Resolve()
}

type Block struct {
	Stmts []Expr `json:"stmts"`
}

func (n Block) MarshalJSON() ([]byte, error) {
	type Object Block
	return json.MarshalIndent(node{"block", Object(n)}, "", "  ")
}

func (n Block) Resolve() *Type {
	// not an expression
	return &TypeNone
}

type For struct {
	Cond  Expr `json:"cond,omitempty"`
	Stmts Expr `json:"stmts"`
}

func (n For) MarshalJSON() ([]byte, error) {
	type Object For
	return json.MarshalIndent(node{"for", Object(n)}, "", "  ")
}

func (n For) Resolve() *Type {
	// not an expression
	return &TypeNone
}

type ForIn struct {
	Name  tokens.Token `json:"ident"`
	Expr  Expr         `json:"expr"`
	Stmts Expr         `json:"stmts"`
}

func (n ForIn) MarshalJSON() ([]byte, error) {
	type Object ForIn
	return json.MarshalIndent(node{"forin", Object(n)}, "", "  ")
}

func (n ForIn) Resolve() *Type {
	// not an expression
	return &TypeNone
}

type IfElse struct {
	Cond  Expr `json:"cond"`
	True  Expr `json:"true"`
	False Expr `json:"false"`
}

func (n IfElse) MarshalJSON() ([]byte, error) {
	type Object IfElse
	return json.MarshalIndent(node{"ifelse", Object(n)}, "", "  ")
}

func (n IfElse) Resolve() *Type {
	// not an expression
	return &TypeNone
}

type Call struct {
	Callee Expr            `json:"callee"`
	Loc    tokens.Location `json:"-"`
	Args   []Expr          `json:"args"`
}

func (n Call) MarshalJSON() ([]byte, error) {
	type Object Call
	return json.MarshalIndent(node{"call", Object(n)}, "", "  ")
}

func (n Call) Resolve() *Type {
	typ := n.Callee.Resolve().Ret
	if typ == nil {
		typ = &TypeNone
	}
	return typ
}

type Struct struct {
	Name tokens.Token `json:"ident"`
	Body Block        `json:"body"`
}

func (n Struct) MarshalJSON() ([]byte, error) {
	type Object Struct
	return json.MarshalIndent(node{"struct", Object(n)}, "", "  ")
}

func (n Struct) Resolve() *Type {
	return NewStructType(n.Name)
}

type GetExpr struct {
	Object Expr `json:"object"`
	Expr   Expr `json:"expr"`
}

func (n GetExpr) MarshalJSON() ([]byte, error) {
	type Object GetExpr
	return json.MarshalIndent(node{"get", Object(n)}, "", "  ")
}

func (n GetExpr) Resolve() *Type {
	// this is likely to be wrong
	return n.Expr.Resolve()
}

type Func struct {
	Name   tokens.Token `json:"ident"`
	Params []Var        `json:"params"`
	Ret    *Type        `json:"ret"`
	Body   Block        `json:"body"`
}

func (n Func) MarshalJSON() ([]byte, error) {
	type Object Func
	return json.MarshalIndent(node{"func", Object(n)}, "", "  ")
}

func (n Func) Resolve() *Type {
	if n.Ret == nil {
		return &TypeNone
	} else {
		return n.Ret
	}
}

type Return struct {
	Value Expr            `json:"expr"`
	Loc   tokens.Location `json:"-"`
	Error bool            `json:"error"`
}

func (n Return) MarshalJSON() ([]byte, error) {
	type Object Return
	return json.MarshalIndent(node{"return", Object(n)}, "", "  ")
}

func (n Return) Resolve() *Type {
	return n.Value.Resolve()
}

type Continue struct {
	Loc tokens.Location `json:"-"`
}

func (n Continue) MarshalJSON() ([]byte, error) {
	type Object Continue
	return json.MarshalIndent(node{"continue", Object(n)}, "", "  ")
}

func (n Continue) Resolve() *Type {
	return &TypeNone
}

type Break struct {
	Loc tokens.Location `json:"-"`
}

func (n Break) MarshalJSON() ([]byte, error) {
	type Object Break
	return json.MarshalIndent(node{"break", Object(n)}, "", "  ")
}

func (n Break) Resolve() *Type {
	return &TypeNone
}