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parse-agreement.js
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parse-agreement.js
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'use strict'
let isLineOrHeader = function (line) {
line = line.toLowerCase()
let tests = [
function (line) { return line.match(/(from).*(list)/) },
function (line) { return line.match(/(following).*(groups)/) }
]
for (let test of tests) { if (test(line)) return true }
}
let isLineRecommendedHeader = function (line) {
line = line.toLowerCase()
let tests = [
function (line) { return line.match(/strongly recommended/) }
]
for (let test of tests) { if (test(line)) return true }
}
let collapseWhitespace = function (string) {
return string.replace(/\s+/g, ' ')
}
let splitAgreementToGroupStreams = function (agreement) {
let lines = agreement.substring(agreement.indexOf('|') - 41).split('\n')
let plan = { required: [] }
let output = plan.required
for (let line of lines) {
if (!line.match(/\|/)) {
if (isLineOrHeader(line)) {
plan.or = []
output = plan.or
}
if (isLineRecommendedHeader(line)) {
plan.recommended = []
output = plan.recommended
}
continue
}
output.push(line)
}
return plan
}
let sortStreamsByBlock = function (plan) {
for (let group in plan) {
let output = []
let buffer = { course: [], equals: [] }
let linked = { course: false, equals: false }
let flush = function () {
if (buffer.course.length && buffer.equals.length) {
output.push({
course: { raw: buffer.course },
equals: { raw: buffer.equals }
})
buffer = { course: [], equals: [] }
linked = { course: false, equals: false }
}
}
for (let line of plan[group]) {
let string = {
course: line.match(/[^|]*$/)[0],
equals: line.match(/^(.*)(?=\|)/)[0]
}
if (string.course.match(/\([0-9]\)/) ||
string.equals.match(/\([0-9]\)/)) {
if (!linked.course &&
!linked.equals) flush()
}
if (string.course.match(/\([0-9]\)/)) {
linked = { course: false, equals: false }
}
if (string.equals.match(/\([0-9]\)/)) {
linked = { course: false, equals: false }
}
if (string.course.match(/(\s\sOR)|(\s\sAND)|([0-Z]\s*&\s*[0-Z])/)) {
linked.course = true
}
if (string.equals.match(/(\s\sOR)|(\s\sAND)|([0-Z]\s*&\s*[0-Z])/)) {
linked.equals = true
}
buffer.course.push(string.course.replace(/\r/g, ''))
buffer.equals.push(string.equals.replace(/\r/g, ''))
}
flush()
plan[group] = output
}
}
let parseAnd = function (plan) {
for (let group in plan) {
for (let i = 0; i < plan[group].length; i++) {
let block = plan[group][i]
if (block.course.raw.join('').match(/\s\sAND/)) {
let output = { relation: 'parallel and', parts: [] }
let buffer = { course: [], equals: [] }
let flush = function () {
output.parts.push({
course: { raw: buffer.course },
equals: { raw: buffer.equals }
})
buffer = { course: [], equals: [] }
}
for (let i = 0; i < block.course.raw.length; i++) {
if (block.course.raw[i].match(/\s\sAND/)) {
flush()
continue
}
buffer.course.push(block.course.raw[i])
buffer.equals.push(block.equals.raw[i])
}
flush()
plan[group][i] = output
}
}
}
}
let parseOr = function (group) {
for (let key in group) {
if (typeof group[key] === 'object') {
if (group[key].hasOwnProperty('course')) {
let block = group[key]
if (block.course.raw.join('').match(/\s\sOR/)) {
let isParallel = block.equals.raw.join('').match(/\s\sOR/)
let output = (isParallel)
? { relation: 'parallel or', parts: [] }
: { course: { relation: 'or', parts: [] }, equals: block.equals }
let buffer = (isParallel) ? { course: [], equals: [] } : []
let flush = function () {
if (isParallel) {
output.parts.push({
course: { raw: buffer.course },
equals: { raw: buffer.equals }
})
buffer = { course: [], equals: [] }
} else {
output.course.parts.push({ course: { raw: buffer } })
buffer = []
}
}
for (let i = 0; i < block.course.raw.length; i++) {
if (block.course.raw[i].match(/\s\sOR/)) {
flush()
continue
}
if (isParallel) {
buffer.course.push(block.course.raw[i])
buffer.equals.push(block.equals.raw[i])
} else buffer.push(block.course.raw[i])
}
flush()
group[key] = output
}
} else parseOr(group[key])
}
}
}
let parseAmpersand = function (plan) {
for (let key in plan) {
if (typeof plan[key] === 'object') {
if (plan[key].hasOwnProperty('raw')) {
if (plan[key].raw.join('').match(/[0-Z]\s*&\s*[0-Z]/)) {
let side = plan[key].raw
let output = { relation: 'ampersand', parts: [] }
let buffer = []
let flush = function () {
if (buffer.length) {
(key === 'course')
? output.parts.push({ course: { raw: buffer } })
: output.parts.push({ equals: { raw: buffer } })
buffer = []
}
}
for (let line of side) {
if (line.match(/\([0-9]\)/)) {
flush()
}
buffer.push(line)
}
flush()
plan[key] = output
}
} else parseAmpersand(plan[key])
}
}
}
let parseCourses = function (plan) {
for (let key in plan) {
if (typeof plan[key] === 'object') {
if (plan[key].hasOwnProperty('raw')) {
let side = plan[key].raw.join(' ')
if (side.toLowerCase().match(/no course articulated/)) {
plan[key] = { articulated: false }
continue
}
if (!side.match(/\([0-9]\)/)) {
plan[key] = { text: collapseWhitespace(side).trim() }
continue
}
let output = { id: '', name: '', units: 0 }
if (side.match(/[0-Z]\s*&\s*[0-Z]/)) side = side.replace(/&/, ' ')
output.id = side.match(/([0-Z\s]*)\s\s/)[0].trim()
side = side.substring(output.id.length)
output.units = parseInt(side.match(/\([0-9]\)/)[0].replace(/[()]/g, ''))
side = side.replace(/\([0-9]\)/, '')
output.name = collapseWhitespace(side).trim()
plan[key] = output
} else parseCourses(plan[key])
}
}
}
let combineOrAndRequiredGroups = function (plan) {
let output = { relation: 'parallel or', parts: [] }
for (let block of plan.or) {
if (JSON.stringify(block).match(/\s\sOR/)) {
let wrapper = { value: block }
parseOr(wrapper)
block = wrapper.value
}
output.parts.push(block)
}
plan.required.push(output)
delete plan.or
}
module.exports = function (agreement) {
let plan = splitAgreementToGroupStreams(agreement)
sortStreamsByBlock(plan)
parseAnd(plan)
if (plan.required) parseOr(plan.required)
if (plan.recommended) parseOr(plan.recommended)
if (plan.or) combineOrAndRequiredGroups(plan)
parseAmpersand(plan)
parseCourses(plan)
return plan
}