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Parametric declarations

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This commit is contained in:
Bán Dénes 2021-01-03 19:48:37 +01:00
parent 29503614cc
commit e515f51c0e
10 changed files with 128 additions and 36 deletions
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96
src/prepare.js
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@ -1,15 +1,6 @@
const u = require('./utils')
const a = require('./assert')
const unnest = exports.unnest = config => {
if (a.type(config)() !== 'object') return config
const result = {}
for (const [key, val] of Object.entries(config)) {
u.deep(result, key, unnest(val))
}
return result
}
const _extend = exports._extend = (to, from) => {
const to_type = a.type(to)()
const from_type = a.type(from)()
@ -41,32 +32,79 @@ const extend = exports.extend = (...args) => {
return res
}
const _inherit = exports._inherit = (config, root, breadcrumbs) => {
const traverse = exports.traverse = (config, root, breadcrumbs, op) => {
if (a.type(config)() !== 'object') return config
const result = {}
for (const [key, val] of Object.entries(config)) {
breadcrumbs.push(key)
let newval = _inherit(val, root, breadcrumbs)
if (newval && newval.$extends !== undefined) {
let candidates = u.deepcopy(newval.$extends)
if (a.type(candidates)() !== 'array') candidates = [candidates]
const list = [newval]
while (candidates.length) {
const path = candidates.shift()
const other = u.deepcopy(u.deep(root, path))
a.assert(other, `"${path}" (reached from "${breadcrumbs.join('.')}.$extends") does not name a valid inheritance target!`)
let parents = other.$extends || []
if (a.type(parents)() !== 'array') parents = [parents]
candidates = candidates.concat(parents)
list.unshift(other)
}
newval = extend.apply(this, list)
delete newval.$extends
}
result[key] = newval
op(result, key, traverse(val, root, breadcrumbs, op), root, breadcrumbs)
breadcrumbs.pop()
}
return result
}
const inherit = exports.inherit = config => _inherit(config, config, [])
exports.unnest = config => traverse(config, config, [], (target, key, val) => {
u.deep(target, key, val)
})
exports.inherit = config => traverse(config, config, [], (target, key, val, root, breadcrumbs) => {
if (val && val.$extends !== undefined) {
let candidates = u.deepcopy(val.$extends)
if (a.type(candidates)() !== 'array') candidates = [candidates]
const list = [val]
while (candidates.length) {
const path = candidates.shift()
const other = u.deepcopy(u.deep(root, path))
a.assert(other, `"${path}" (reached from "${breadcrumbs.join('.')}.$extends") does not name a valid inheritance target!`)
let parents = other.$extends || []
if (a.type(parents)() !== 'array') parents = [parents]
candidates = candidates.concat(parents)
list.unshift(other)
}
val = extend.apply(this, list)
delete val.$extends
}
target[key] = val
})
exports.parameterize = config => traverse(config, config, [], (target, key, val, root, breadcrumbs) => {
let params = val.$params
let args = val.$args
// explicitly skipped (probably intermediate) template, remove (by not setting it)
if (val.$skip) return
// nothing to do here, just pass the original value through
if (!params && !args) {
target[key] = val
return
}
// unused template, remove (by not setting it)
if (params && !args) return
if (!params && args) {
throw new Error(`Trying to parameterize through "${breadcrumbs}.$args", but the corresponding "$params" field is missing!`)
}
params = a.strarr(params, `${breadcrumbs}.$params`)
args = a.sane(args, `${breadcrumbs}.$args`, 'array')()
if (params.length !== args.length) {
throw new Error(`The number of "$params" and "$args" don't match for "${breadcrumbs}"!`)
}
let str = JSON.stringify(val)
const zip = rows => rows[0].map((_, i) => rows.map(row => row[i]))
for (const [par, arg] of zip([params, args])) {
str = str.replace(new RegExp(`"${par}"`, 'g'), JSON.stringify(arg))
}
try {
val = JSON.parse(str)
} catch (ex) {
throw new Error(`Replacements didn't lead to a valid JSON object at "${breadcrumbs}"! ` + ex)
}
delete val.$params
delete val.$args
target[key] = val
})