git:20261007.10acd6a to git:20261007.39c2f5b

# markvis (full)

Quantitative Markdown charts. Path: fence | GFM | HTML comment → parser → Chart IR → SVG + table fallback.

## Grammar

1. Optional `markvis: 2`

2. CORE headers: `type`, `title`, `theme`, `palette`, `surface`, `unit`, `x`, `y`, `series`

3. Type-local encodings when legal: `layout`, `innerRadius`, `min`, `max`, `orient`, `role`

4. Blank line

5. CSV or GFM table with a header row

Language tags `chart`, `markvis`, `vis` share one parser.

## Types (CORE)

| type | notes |

| --- | --- |

| bar | keep row order; optional `layout`; optional `orient: horizontal` |

| line | multi-series via `series`; keep row order; optional `layout`; empty y is a gap |

| area | same order rule as line; optional `layout`; empty y is a gap |

| scatter | numeric x and y; repeated rows stay |

| pie | values ≥ 0; do not normalize to 100; optional `innerRadius`; empty y is E_MISSING_VALUE |

| hist | continuous x; table keeps raw rows; repeated samples stay |

| heatmap | x cat × series cat, y intensity; long form; series required; empty y is missing, not zero |

| funnel | x stage, y ≥ 0; centered bands narrow from each value to the next; label to the right; series ignored |

| waterfall | x step, y signed delta; optional `role` column; totals are not inferred from the label |

| radar | x spoke, y ≥ 0; optional series; one shared scale; missing spoke is a gap |

| gauge | one row (a second row is E_DUP_KEY); omit max → 100; series ignored |

| sankey | x source, series target (required), y flow ≥ 0; one thickness scale; a cycle is E_SANKEY_CYCLE |

| treemap | x label, y ≥ 0; optional series parent; two levels max |

## Encodings

| field | legal on | values | omit |

| --- | --- | --- | --- |

| layout | bar line area | grouped \| stacked \| percent | grouped |

| innerRadius | pie | [0, 1] | theme PIE_INNER_RATIO (explicit 0 = solid) |

| min | gauge, heatmap | number | gauge 0; heatmap data min |

| max | gauge, heatmap, radar | number | gauge 100; heatmap data max; radar data max |

| orient | bar | horizontal \| vertical | vertical |

| role | waterfall | column of delta \| total \| subtotal | every row is a delta |

Wrong type / bad value → E_UNKNOWN_FIELD + table. Do not invent donut, stacked-bar, sunburst, or chord type ids. Gauge with both min and max set requires min < max.

`surface` optional: `light` (default, no canvas fill) | `dark` | `export`. Dark and export paint their own paper.

## Errors (stable codes)

E_UNKNOWN_TYPE, E_TYPE_TYPO, E_JSON_DATA, E_MISSING_HEADER, E_EMPTY_DATA, E_EXTRA_COLUMN, E_DUP_COLUMN, E_UNKNOWN_FIELD, E_PIE_NEGATIVE, E_NEGATIVE_VALUE, E_YAML_TABLE_CONFLICT, E_EMPTY_FENCE, E_UNKNOWN_THEME, E_UNKNOWN_PALETTE, E_BAD_VERSION, E_BAD_NUMBER, E_MISSING_VALUE, E_DUP_KEY, E_SANKEY_CYCLE.

Optional `theme:` grammar pack: folio|highcharts|shadcn|docs|ant|recharts|graphite (default folio).

Optional `palette:` color table: ink|porcelain|warm|cool|vivid (omit → theme default colors). Theme ≠ palette.

Invalid → table + one-line error. Never drop recovered rows.

## Examples

See examples/valid/01–08 (canonical) and SPEC.md. Natural-language → fence: examples/prompts.md.

## Product boundaries

No chart runtimes in core. No JSON-as-default data. Do not invent donut / sunburst / chord / stacked-bar as type ids. Structure diagrams stay outside this language. The catalog is the thirteen types in the table above. See docs/TYPES.md.