import json
from pathlib import Path
SOURCE = Path('/home/user/output/canvas/dashboard.json')
TARGET = Path('/home/user/output/canvas/CANVAS.md')
def esc(value):
return (str(value).replace('&', '&').replace('<', '<')
.replace('>', '>').replace('"', '"').replace("'", '''))
def check(condition, message):
if not condition:
raise ValueError(message)
def number(value):
check(isinstance(value, (int, float)) and not isinstance(value, bool), 'chart values must be numeric')
return float(value)
def chart_data(widget):
categories = widget.get('categories')
series = widget.get('series')
check(isinstance(categories, list) and categories, 'chart categories are required')
check(isinstance(series, list) and series, 'chart series are required')
result = []
for item in series:
values = item.get('values') if isinstance(item, dict) else None
check(isinstance(values, list) and len(values) == len(categories), 'series values must match categories')
result.append((esc(item.get('name', 'Series')), [number(value) for value in values]))
return [esc(value) for value in categories], result
def metric(widget):
result = '
' + esc(widget.get('value', '')) + '
'
if 'change' in widget:
trend = widget.get('trend', 'neutral')
check(trend in ('up', 'down', 'neutral'), 'invalid metric trend')
result += '
' + esc(widget['change']) + '
'
return result
def bar(widget):
categories, series = chart_data(widget)
maximum = max([abs(value) for _, values in series for value in values] or [1])
rows = []
for index, category in enumerate(categories):
bars = []
for name, values in series:
width = abs(values[index]) / maximum * 100
bars.append('
' + name + '
' + esc(values[index]) + '
')
rows.append('
' + category + '' + ''.join(bars) + '
')
return '
' + ''.join(rows) + '
'
def line(widget):
categories, series = chart_data(widget)
values = [value for _, data in series for value in data]
low = min(values)
span = max(values) - low or 1
lines = []
colors = ['#2563eb', '#0f766e', '#c2410c', '#7c3aed']
for series_index, (name, data) in enumerate(series):
points = []
for index, value in enumerate(data):
x = 20 + index * (360 / max(1, len(categories) - 1))
y = 170 - ((value - low) / span * 140)
points.append(str(round(x, 1)) + ',' + str(round(y, 1)))
color = colors[series_index % len(colors)]
lines.append('' + name + '')
labels = ''.join('' + category + '' for index, category in enumerate(categories))
return ''
def pie(widget):
labels = widget.get('labels')
values = widget.get('values')
check(isinstance(labels, list) and isinstance(values, list) and labels and len(labels) == len(values), 'pie labels and values must match')
check(len(labels) <= 6, 'pie charts cannot contain more than six categories')
values = [number(value) for value in values]
total = sum(values)
check(total > 0, 'pie values must have a positive total')
colors = ['#2563eb', '#0f766e', '#c2410c', '#7c3aed', '#ca8a04', '#be123c']
cursor = 0
stops = []
legend = []
for index, value in enumerate(values):
end = cursor + value / total * 100
stops.append(colors[index] + ' ' + str(cursor) + '% ' + str(end) + '%')
legend.append('
' + esc(labels[index]) + ' ' + esc(value) + '
')
cursor = end
return '
' + ''.join(legend) + '
'
def table(widget):
columns = widget.get('columns')
rows = widget.get('rows')
check(isinstance(columns, list) and isinstance(rows, list), 'table columns and rows are required')
check(all(isinstance(row, list) and len(row) == len(columns) for row in rows), 'table rows must match columns')
head = ''.join('