forked from sanbuphy/learn-coding-agent
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathParsedCommand.ts
More file actions
318 lines (282 loc) · 9 KB
/
ParsedCommand.ts
File metadata and controls
318 lines (282 loc) · 9 KB
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
import memoize from 'lodash-es/memoize.js'
import {
extractOutputRedirections,
splitCommandWithOperators,
} from './commands.js'
import type { Node } from './parser.js'
import {
analyzeCommand,
type TreeSitterAnalysis,
} from './treeSitterAnalysis.js'
export type OutputRedirection = {
target: string
operator: '>' | '>>'
}
/**
* Interface for parsed command implementations.
* Both tree-sitter and regex fallback implementations conform to this.
*/
export interface IParsedCommand {
readonly originalCommand: string
toString(): string
getPipeSegments(): string[]
withoutOutputRedirections(): string
getOutputRedirections(): OutputRedirection[]
/**
* Returns tree-sitter analysis data if available.
* Returns null for the regex fallback implementation.
*/
getTreeSitterAnalysis(): TreeSitterAnalysis | null
}
/**
* @deprecated Legacy regex/shell-quote path. Only used when tree-sitter is
* unavailable. The primary gate is parseForSecurity (ast.ts).
*
* Regex-based fallback implementation using shell-quote parser.
* Used when tree-sitter is not available.
* Exported for testing purposes.
*/
export class RegexParsedCommand_DEPRECATED implements IParsedCommand {
readonly originalCommand: string
constructor(command: string) {
this.originalCommand = command
}
toString(): string {
return this.originalCommand
}
getPipeSegments(): string[] {
try {
const parts = splitCommandWithOperators(this.originalCommand)
const segments: string[] = []
let currentSegment: string[] = []
for (const part of parts) {
if (part === '|') {
if (currentSegment.length > 0) {
segments.push(currentSegment.join(' '))
currentSegment = []
}
} else {
currentSegment.push(part)
}
}
if (currentSegment.length > 0) {
segments.push(currentSegment.join(' '))
}
return segments.length > 0 ? segments : [this.originalCommand]
} catch {
return [this.originalCommand]
}
}
withoutOutputRedirections(): string {
if (!this.originalCommand.includes('>')) {
return this.originalCommand
}
const { commandWithoutRedirections, redirections } =
extractOutputRedirections(this.originalCommand)
return redirections.length > 0
? commandWithoutRedirections
: this.originalCommand
}
getOutputRedirections(): OutputRedirection[] {
const { redirections } = extractOutputRedirections(this.originalCommand)
return redirections
}
getTreeSitterAnalysis(): TreeSitterAnalysis | null {
return null
}
}
type RedirectionNode = OutputRedirection & {
startIndex: number
endIndex: number
}
function visitNodes(node: Node, visitor: (node: Node) => void): void {
visitor(node)
for (const child of node.children) {
visitNodes(child, visitor)
}
}
function extractPipePositions(rootNode: Node): number[] {
const pipePositions: number[] = []
visitNodes(rootNode, node => {
if (node.type === 'pipeline') {
for (const child of node.children) {
if (child.type === '|') {
pipePositions.push(child.startIndex)
}
}
}
})
// visitNodes is depth-first. For `a | b && c | d`, the outer `list` nests
// the second pipeline as a sibling of the first, so the outer `|` is
// visited before the inner one — positions arrive out of order.
// getPipeSegments iterates them to slice left-to-right, so sort here.
return pipePositions.sort((a, b) => a - b)
}
function extractRedirectionNodes(rootNode: Node): RedirectionNode[] {
const redirections: RedirectionNode[] = []
visitNodes(rootNode, node => {
if (node.type === 'file_redirect') {
const children = node.children
const op = children.find(c => c.type === '>' || c.type === '>>')
const target = children.find(c => c.type === 'word')
if (op && target) {
redirections.push({
startIndex: node.startIndex,
endIndex: node.endIndex,
target: target.text,
operator: op.type as '>' | '>>',
})
}
}
})
return redirections
}
class TreeSitterParsedCommand implements IParsedCommand {
readonly originalCommand: string
// Tree-sitter's startIndex/endIndex are UTF-8 byte offsets, but JS
// String.slice() uses UTF-16 code-unit indices. For ASCII they coincide;
// for multi-byte code points (e.g. `—` U+2014: 3 UTF-8 bytes, 1 code unit)
// they diverge and slicing the string directly lands mid-token. Slicing
// the UTF-8 Buffer with tree-sitter's byte offsets and decoding back to
// string is correct regardless of code-point width.
private readonly commandBytes: Buffer
private readonly pipePositions: number[]
private readonly redirectionNodes: RedirectionNode[]
private readonly treeSitterAnalysis: TreeSitterAnalysis
constructor(
command: string,
pipePositions: number[],
redirectionNodes: RedirectionNode[],
treeSitterAnalysis: TreeSitterAnalysis,
) {
this.originalCommand = command
this.commandBytes = Buffer.from(command, 'utf8')
this.pipePositions = pipePositions
this.redirectionNodes = redirectionNodes
this.treeSitterAnalysis = treeSitterAnalysis
}
toString(): string {
return this.originalCommand
}
getPipeSegments(): string[] {
if (this.pipePositions.length === 0) {
return [this.originalCommand]
}
const segments: string[] = []
let currentStart = 0
for (const pipePos of this.pipePositions) {
const segment = this.commandBytes
.subarray(currentStart, pipePos)
.toString('utf8')
.trim()
if (segment) {
segments.push(segment)
}
currentStart = pipePos + 1
}
const lastSegment = this.commandBytes
.subarray(currentStart)
.toString('utf8')
.trim()
if (lastSegment) {
segments.push(lastSegment)
}
return segments
}
withoutOutputRedirections(): string {
if (this.redirectionNodes.length === 0) return this.originalCommand
const sorted = [...this.redirectionNodes].sort(
(a, b) => b.startIndex - a.startIndex,
)
let result = this.commandBytes
for (const redir of sorted) {
result = Buffer.concat([
result.subarray(0, redir.startIndex),
result.subarray(redir.endIndex),
])
}
return result.toString('utf8').trim().replace(/\s+/g, ' ')
}
getOutputRedirections(): OutputRedirection[] {
return this.redirectionNodes.map(({ target, operator }) => ({
target,
operator,
}))
}
getTreeSitterAnalysis(): TreeSitterAnalysis {
return this.treeSitterAnalysis
}
}
const getTreeSitterAvailable = memoize(async (): Promise<boolean> => {
try {
const { parseCommand } = await import('./parser.js')
const testResult = await parseCommand('echo test')
return testResult !== null
} catch {
return false
}
})
/**
* Build a TreeSitterParsedCommand from a pre-parsed AST root. Lets callers
* that already have the tree skip the redundant native.parse that
* ParsedCommand.parse would do.
*/
export function buildParsedCommandFromRoot(
command: string,
root: Node,
): IParsedCommand {
const pipePositions = extractPipePositions(root)
const redirectionNodes = extractRedirectionNodes(root)
const analysis = analyzeCommand(root, command)
return new TreeSitterParsedCommand(
command,
pipePositions,
redirectionNodes,
analysis,
)
}
async function doParse(command: string): Promise<IParsedCommand | null> {
if (!command) return null
const treeSitterAvailable = await getTreeSitterAvailable()
if (treeSitterAvailable) {
try {
const { parseCommand } = await import('./parser.js')
const data = await parseCommand(command)
if (data) {
// Native NAPI parser returns plain JS objects (no WASM handles);
// nothing to free — extract directly.
return buildParsedCommandFromRoot(command, data.rootNode)
}
} catch {
// Fall through to regex implementation
}
}
// Fallback to regex implementation
return new RegexParsedCommand_DEPRECATED(command)
}
// Single-entry cache: legacy callers (bashCommandIsSafeAsync,
// buildSegmentWithoutRedirections) may call ParsedCommand.parse repeatedly
// with the same command string. Each parse() is ~1 native.parse + ~6 tree
// walks, so caching the most recent command skips the redundant work.
// Size-1 bound avoids leaking TreeSitterParsedCommand instances.
let lastCmd: string | undefined
let lastResult: Promise<IParsedCommand | null> | undefined
/**
* ParsedCommand provides methods for working with shell commands.
* Uses tree-sitter when available for quote-aware parsing,
* falls back to regex-based parsing otherwise.
*/
export const ParsedCommand = {
/**
* Parse a command string and return a ParsedCommand instance.
* Returns null if parsing fails completely.
*/
parse(command: string): Promise<IParsedCommand | null> {
if (command === lastCmd && lastResult !== undefined) {
return lastResult
}
lastCmd = command
lastResult = doParse(command)
return lastResult
},
}