Description
Plant distinct boundary space, tab, NBSP or zero-width-space mutations in supplied cells and retain actual ECMAScript trimming answers, including ZWSP controls that survive trimming.
CSV stores records as delimited text fields. Quoting can protect embedded delimiters and newlines, so a record need not equal one physical line. Cleaning field contents, interpreting their types, and preserving an exact import/export round trip are separate operations.
Plant distinct boundary space, tab, NBSP or zero-width-space mutations in supplied cells and retain actual ECMAScript trimming answers, including ZWSP controls that survive trimming.
When to use this tool
Use this generator to create reproducible csv whitespace cleaning corpus cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.
How to use the tool and how it works
- Supply rows, mutationCount in the field shapes below. Set seed when you need an explicit replay.
- Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
- Read damagedRows, cleanedRows, mutations, cleaningRule. Use the conventions below. Keep answer-bearing fields separate when presenting an exercise.
Select distinct table cells and pad them on both sides with space, tab, NBSP, or zero-width space. Record whether trimming would restore the original and delegate CSV field trimming for the damaged table.1
Delegated operations used for this result: field whitespace trimmer. Their calculation or parsing conventions apply to the corresponding result fields.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| rows | Rows | Required. Array of Array of Text; maximum UTF-16 length 64.; minimum items 1; maximum items 8.; minimum items 1; maximum items 32. |
| mutationCount | Mutation Count | Required. Safe integer; minimum 1; maximum 256. |
| seed | Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed. | Optional. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| damagedRows | Damaged Rows | Required. Array of Array of Text; maximum UTF-16 length 256.; minimum items 1; maximum items 10.; minimum items 0; maximum items 128. |
| cleanedRows | Cleaned Rows | Required. Array of Array of Text; maximum UTF-16 length 256.; minimum items 1; maximum items 10.; minimum items 0; maximum items 128. |
| mutations | Mutations | Required. Array of Object; no unknown keys.; minimum items 0; maximum items 256. |
| mutations[].row | Row | Required. Safe integer; minimum 0; maximum 31. |
| mutations[].column | Column | Required. Safe integer; minimum 0; maximum 7. |
| mutations[].kind | Kind | Required. Text; one of "space", "tab", "nbsp", "zwsp". |
| mutations[].original | Original | Required. Text; maximum UTF-16 length 64. |
| mutations[].mutated | Mutated | Required. Text; maximum UTF-16 length 66. |
| mutations[].trimRestores | Trim Restores | Required. Boolean. |
| cleaningRule | Cleaning Rule | Required. Text; one of "ECMAScript-trim-preserving-ZWSP". |
| randomness | Replay source and normalized 32-bit seed, or null seed for an advancing context source. | Required. Object; no unknown keys. |
| randomness.seed | Optional safe-integer replay seed; normalization and precedence are explained below. | Required. Safe integer. or Null. |
| randomness.source | Source | Required. Text; one of "context", "seed". |
An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.
{
"input": {
"rows": [
[
"a",
"b"
],
[
"c",
"d"
]
],
"mutationCount": 1,
"seed": 42
},
"output": {
"damagedRows": [
[
"a",
"b"
],
[
"\tc\t",
"d"
]
],
"cleanedRows": [
[
"a",
"b"
],
[
"c",
"d"
]
],
"mutations": [
{
"row": 1,
"column": 0,
"kind": "tab",
"original": "c",
"mutated": "\tc\t",
"trimRestores": true
}
],
"cleaningRule": "ECMAScript-trim-preserving-ZWSP",
"randomness": {
"seed": 42,
"source": "seed"
}
}
}Limitations and assumptions
- ECMAScript trim removes NBSP but preserves zero-width space. Originally padded text may also change under trimming. This produces cleaning evidence, not automatic proof that whitespace is unwanted.
- A replay requires the same complete input and implementation. The stated sampling convention applies within its eligible space. A finite draw does not exhaust all possible outputs; repeats remain possible unless a distinct-selection rule is explicit.
- The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.
Alternative or Complementary methods
For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.
References
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