feat(2021-day-10): lint navigation instructions

2021/day-10/index.js

@@ -0,0 +1,3 @@
+// eslint-disable-next-line no-unused-vars
+const console = require('../helpers')
+require('./solution')

2021/day-10/input.txt

@@ -0,0 +1,94 @@
+[[<[<{[<{{<[{(()[])[[]()]}[((){})<[]{}>]}<<{[]{}}<(){}>><([]<>)>>>[[[<<>>[<><>]][<<>>(<><>)]][{
+((<[(<<(<{<((<()<>>{()()}){<<>><()[]>})([{<>{}}(()[])]{(<><>>})>(<((()())<[][]>)>([(<>{})({}())][<
+<<<(<<[[((({<([]<>)[[]]>{<{}>{(){}}}}{[<[][]><<>[]>]({<><>}{()<>})})[<<({}())(()<>)>[([]{})<[]()>]>({[[]
+<(<<<[((([{({((){})<<>{}>}[<(){}>[<>()]])[[<{}[]>({}{}]](<<>[]><[]<>>)]}](<[({[][]}<()<>>)<[
+{<<<{[({{(<<(<<>[]><[]()>){<[][]>{<>{}}}>((({}())([]<>))[<{}{}>({}())])>(<<<()[]>><<<>{}>(()<
+{<{<<[[(<<[{<<{}[]>>([<>()]{{}{}})}]<(<{<>()}{{}()}>{({}[])<<>()>})>>>){[{[{<[[]{}][<><>]>}{(<{}(
+(((([(({((<[<(<>{})[{}{}]>](<[()<>]{<><>}>)><<[<[]{}>((){})]<[()[]]>>{[{<>()}((){})]({()[]}(()[]))}>))}(
+<<[(({({(<{{((<>[])[[]<>])([<>]{()()})}<<{<>[]}><<{}()>>>}>)(<(<{<()[]><(){}>}{{(){}}[{}<>]}>{
+(([[{<[<<{[<{<()[]>{<>[]}}{<{}{}>{[]<>}}>[{<{}{}>(<>[])}]]{<<({}[])>(<[]<>>[{}])>({{<>()}(<
+(<{{(<<{[([<<{()[]}>{({}<>){<>[]}]>((<[]{}><{}{}>))]([{(()<>)(<>[])}]<<((){})<<>{}>>[(()[])
+{{[[<<{<{{{([{()[]}[{}()]]{(<>{}){<><>}}){<[[][]][()[]]>}}<{{<[][]>[{}[]]>(<<>{}><{}{}>)}>}}<<{[{([](
+{[<({{{[<{<{[([][])]{({}())<[][]>}}((<(){}>{()<>})<<<>{}>>)>}(((<{<>{}}<{}()>>)[((()()))[<<>{}>(
+{{{[{{[(([{{[[{}<>]([]<>)]([(){}][[]()])}[{{[]<>}[{}()]}(<<><>>]]}][[([[[]<>]<<>{}>][{[]{}
+<<{{{[{{[<({<<[]<>><{}<>>>}[[{()<>}{[]<>}]({(){}}{{}()})])[[(<<>[]>[[]])[{{}{}}[[]()]]]<((
+({{[{{{{<[[({[{}{}]{[]<>}}<<()<>>(()<>)>)<{{(){}]<()()>}{{(){}}[<><>]}>]<<({{}{}}<(){}>)([{}
+{([[[<<([[{{[<()<>>(()<>))({<>[]}(<>{}))}{(<{}()>{()[]})}}([[{{}[]}<[]>]<([]<>){<>}>])]<{[[([]{})]{(<><>)[[]<
+([<<([<[[({((({}[]){[]{}}){({}[])({}<>)})>)[(<{{{}{}}[(){}]}(([][])<{}<>>)><[[<><>]{<>{}}]{{{}[]}{[][]}}>)<[[
+{[<<{[<{[<{[[({}[])({}<>)]<<{}{}>{{}()}}]{[[<>{}]<[]{}>]}}(([(<><>){[][]}]([<>()]<()[]>))<[<()<>>(<><>)
+(<[<[(({{<{<<[{}()]>(([]())<<>[]>)>}[{<[[]{}]([]<>)><{<><>}[()<>]>}{{{(){}}{[]{}}}}]>}}){{<{([<([]())({}())
+<<{({{<[<[{([{{}<>}{<><>}]([(){}](()[]))){[{()[]}<<>()>]({()()}({}()))}}]<[<<(())(()[])>>{(<{}<>>{
+{{{(<<[(<[([[[()<>]<()[]>]]{[[[]{}]{<>{}}]((<><>)({}{}))})]([(<{<>()}{[]{}}><<{}{}><<>[]>>)[<<()[]>((){
+[{(<<{[<<([{[<[][]>][{()()}({}())]}]([{([]{})<{}<>>}(<()>[{}])]{<([]<>)<{}{}>>(({}<>)<<><>>)}))>([[((<<>{}
+[[(<({{(({{(<[{}<>]([]{})>{[<>[]]([][])})[(<[]<>><{}()>)[<{}()>(())]]}<[<[[]{}]<{}{}>>{<()()>({}<>)}]<
+([(<({(<{{(((<[]<>>{<>()})<{[]{}>([]{})>)[<[()<>]({}[])>[(<>{})(<>[])]]){<((<>{}){()[]})><{<[]<>><<><>>
+({{<({(<<({[[{<><>}]<<<><>>({}[])>]([<[]<>>[{}()]]{{<>{}}({}[])}}}<{({[]<>}({}{}))[(<>())(<>())]}((([]{}){[][
+(((({[(<([<[(<<>>[[][]])<{<><>}[{}<>]>]{({<>()}(<><>))(({}<>))}>])<([[<<()<>>{[][]}>]<[[[][
+[<<(([({((<<{({}())}[(()()){[]<>}]>>){({<[{}{}]<<>()>>{<{}()>}})})})])[[<((<[{([<>()][{}[]])((()[])
+{{{<{[[(<[{{<<{}()>[{}<>]>{({}{})<()>}}(<[(){}]>(<(){}>[[]]))}(<<[[]{}}({})><[<>[]]{<><>}>><[<[]<>>{<><>}](((
+{<[[<[{{<((<[<<>()><[]{}>][<{}()><{}{}>]>)[[[[[][]]<()[]}][([]{})(()())]]])>[[((<{[]<>}<()>><[{}[]](<><>)>
+<{([{[{[{([({<{}[]>([]<>)}[[[][]]<()()>])[<[{}()]>{<<><>>(()<>)}]]){({(<[]<>>([]<>))[(<>){
+[{{<(({<{[{<{({})(<>[])}({<><>}{[]()})>(({[]<>}(<>{}))[{()()}{{}<>}])}{<{{<>()}<[]{})}(<()><(
+{(<[{[[{{<(([{{}{}}<()[]>]<[<><>]>)([(<><>)])){<<{[]{}}[[][]]>{[[]<>]{<>{}}}>[<<[][]><<>()>><<{}<>>[<>()>>]}>
+<[{{(<<{{{[[{<[]<>>(()<>)}<{()<>}{<>[]}>]<[<()()>]{<<>>([]())}>]{([<<>{}>({}<>)])[({{}}{[]<>})[
+<<[[<<[(<{{{[{()[]}([]())][[[]]((){})]}}(([{[][]}[()()]]<<()>[{}[]]>))}>)<{({{<[[][]]{()()}><<{}{}
+{[<(([([{({([({}()){<><>}][((){})([]())])[<<()<>>(<>())>{[[]()}(()[])}]}<{{<(){}>{()[]}}((<><>){{}<>})}((
+{(({([[{{((([<()()>([][])]<<{}[]>[<>]>)(<{<><>}[{}{}]>[[<>{}]]))[{<<[][]>[()]><[{}{}]>}{<([]<>)([]<>)>}]
+(({[[<<<{[{([(<>[])<()[]>])(<([])({}{})>)}[{(<<>{}>({}<>))}<<[<>[]>[(){}]>(<{}{}>)>]]{([[<<>()>
+[{[[{([({[{(({()[]}[[]<>])<[[]<>]([])>)([{{}{}}[{}[]]]<{{}<>}>)][<(<<>[]>{<><>})<(()<>){[][]}>>[[{[]{}}([]())
+([[{({([({<<(<[]<>>)[{()[]}<<>()>]><<{<>()}<<>[]>>[[<>{}]<<><>>]>)<<<<<>[]><<><>>>[[[]]]>[{
+[{{([(<[[<{((([]{})[()()])[<[]{}>[<>()]])<[{()()}(<>{})]({[]}[<>{}])>}((<{[]()}>)({<{}{}>[
+[[[{{[[[<<(<(({}())[<>{}])<{{}<>}(()())>>[[((){})][[[]{}]{()}]])>>{[(<([{}{}]({}<>))([{}()]<<>[]])>({<
+{<{({(({{{[{<(<>{})>{<{}<>>(<><>)}}<(<[]()>[[][]])<[{}()]>>]<{{<()[]>{{}()}}{<{}[]>{{}{}}}}{{<()<>><<>
+[{[<{[<<({(<{{<>()}({}<>)}<(<>[])[()()]>>{{{<>()}{()[]}}})<{<({}()){<>{}}>({<>[]}({}())]}>}(
+[[{<([((({([{{()[]}<[]{}>}({<>[]}[<><>])]{{<[]<>>[<><>]}[{()()}[<>[]]]})}[{[<{()()}(<>))<({}){()<>}>]([
+(<(<{[{<({[{{{[]()}({}{})}{<{}[]><<>{}>}}]})>}<{[[(<[<[]{}>([]())](<{}>[()()])>)][(([{[]<>
+<<<<{<{<<[<({<[]>({}<>)})<[{[][]}[[]()]][[{}<>]<{}[]>])>([(([][])[[]()])<[{}[]]{[]{}}>](<[{}()]{{}()}
+({[[([([<{[[({()[]}[<>[]])[<[][]><<>{}>>][(({}{})(<>[])){(<>[])}]]<{{{{}()}[<>[]]}<[[]<>]([]())>}>}{<{({
+((<{<{{[((<<<(()<>)<[]{}>>[<[][]>[(){}]]>>)){([[[[<>]({}<>)]{{{}<>}([]{})}]<[<<>()>(()())][{[]{}}{[]<>}]>]
+{<<{{[({[<{{(<{}[]><<>[]>)([[]()])}<[{{}{}}{<><>}]<({})<{}()>>>}<[([{}<>][<>{}])](<<{}[]><<
+{[{[[<<[(({[(((){}){<>[]})]([[<>[]]][<<>{}>[<><>]])})({<[({}[])<{}[]>]>}<(<(()<>)[[]{}]][[()()][<><
+((<<[({<{[[({<[]()>([]())}[<[]{}>(()<>)])]<<{[{}[]][<>()]}><<{<>[]}[()<>]>[<[]{}>{[]()}]>>][(({[<>
+{{<[{<([({{([<<><>>{{}()}][<[][]>{[]()}])[<[[]]{[]<>}>]}(({<()[]>[{}()]}<[[]<>]{<>()}>))})])<{[{<[<[{}{}]
+[(({({[[<{(<{{<>[]}[()<>]}((<>{})<<>[]>)>{[<(){}>{{}<>}]])[<{(<>[]){{}[]}}([()()][<>[]])>((({}())
+{(([<{([[{([<<{}()><[][]>>[(<>()){()[]}]]<[<()()>[{}]]([{}<>][{}[]])>){<{[[]<>]<<>{}>}{([]{})}>[([
+<{[{({([(<<{<[()<>]<(){}>>(<()>{[][]})})>{[([<{}{}>[<>()]])[{([]()){<>{}}}<<{}<>>>]]})])([<(([{<(){}>[{
+<<<(([<[{[[<{({}()>{[]()}}>]]([<[[()][{}[]]]<[()()]{(){}}>><<({}[])(()<>)>{(()[])}>]{[(<[]()>)[{[]{}}
+(({(([[<{(<{[(<>[]]]}<(({}{}))([[][]]([][]))>><[{(()())[()<>]}<{(){}}>]>)((<{{()[]}{<>()}}<([
+[[[{<[{<[<[[{(<>{})<[]()>}{(()[])[<>()]}][<({}()>[<><>]>{<[]{}><[][]>}]]><<{[{(){}}{{}{}}][<<><
+((([<<((<[{(([<>[]]([]{}))([<>]{<>()})}([[(){}][[]()]][(<><>){{}()}])}{[<[()<>]({}<>)>[<{}{}>]][<(<>())<[]
+{<<{([(((([{<[()]{(){}}>{{{}[]}}}[{(()[]){()<>}}{<<>>[<>{}]}]]<[{(<>())(()[])}]>){[[<({}{})[()[]]>{[{}(
+([{(({([([(<<{<>[]}<{}<>>>[[[]{}]<[]{}>]>((([]<>)<<>[]>)[[(){}]]))[<{{<>{}}}[(<>}{()()}]><{<<>{}><
+{(<[<{({([{{([[][]]>({()()}[[][]])}[<(()())([]())><(<><>)([]{})>]}[(({{}{}}{{}<>})([<><>]<()[]>))]
+((<(<<{{{{<{{(()<>)({}{})}{{<>[]}<()[]>}}<<<[][]>(()[])>[[()[]][[]()]]>>[[{{[]{}}[[][]]}][<[()[]]{[]<>}>
+(((<(<<<{{<{<{{}{}}(()<>)>[((){})[()[]]]}{[[<>[]]{{}()}][{()[]}({}{})]}>}}>{[{<<{[{}()]}<[[]()]
+({(([[<{[{<(([[]()](<><>))[<{}[]){{}()}])(<[()[]]<[]()>>[<{}<>>[()<>]])>[<[[()()]<<>[]>][([]())([]{})]>{{<<>(
+[[(([((([<[[<{{}<>}({}[])>[([]<>)[()[]]]]<[(()())({}<>)](([]<>)<[]()>)>]>[{{{(()<>)}<{[]()}
+(<(({[<<{((<[[[]()]{{}<>}]<<{}()>({}[])>>)<{{({}){()()}}<{[][]}>}>){[(<<[]<>>[{}{}]>{{(){}}{[
+{<(<(<<{<(<{{[{}[]]([]{})}([{}[]](<>))}[([<>()]{[]{}})<({}<>){<><>}>]>[{<[[][]]>}[<[<><>](()())>(([
+{(<(<{<(<<{{{<(){}>}({[][]}{{}{}})}}<(<<<>()>[(){}]>(<{}()>{{}}))>>[{{[{[]{}}(()[])]}[((<>())<<
+([((([[{([{<<((){})>{{<>}{[]()}}>{[((){})<()[]>]<{[]{}}[(){}]>}}{((<{}()><{}>)){{<{}[]>[[]
+{{{(<<{((([[{(<>{})({}())}[<[]()>({}{})]]<<[{}]>{[[]()]{()[]}}>]{({<()[]>((){})})<{<[]<>>{{}{}
+(<<[[([{{(<<({{}}[{}{}])<([]{}){<>()}>>>(({<()()>({}[])}<<{}()>[(){}]>)))[{([{<>[]}([]())]([()()][<>{}])){
+<(<(<<<([[[(<{{}[]}{{}[]}>[[<>()]{()[]}])]<{({{}()}{{}<>})<({}[])([]<>)>}{(({}[])(<>{}))((()<>)<[]()>)}>](<
+<<{(([<([[[[<{<>()}({}[])>{((){})[{}()]}]}[<{<<>[]><[]<>>}<[{}<>]{{}()}>>{{(()())[()[]]}{<()<>
+(({<<[{([{<(([{}[]][(){}])[<[]()>(()<>)]}>}<[(<{{}()}{{}<>}><[[]()][[]()]>)]<(<(<>())>({<>[]})){[{(){}}<{}{}>
+({[[{[{{<(([[[{}{}]<(){}>]((()[])(()[]))]({([]<>)({}{})}{<<>{}>{<>}}))<{(<[]{}>(()()))[[()[]](<><>)
+([{[{{<{{(<[((<>){[]()})(({}())[<><>])]>({[(<><>}{{}[]}]{(()[])[()]}}{([[]{}](<><>))<<{}[]>(<>())>}))
+<[(([[[<{[[(({()[]}<<>[]>){{<><>}<(){}>})<([()]{<>[]}){{<>{}}}>]]<[{{([]())({}{}>}<{[][]}<<>{}>
+({(<{<([[<{[<{[]()}[{}<>>>[[(){}][[]{}]]][{[()<>][<><>]}{<()()>}]}<({{(){}}<()()>}{[<><>](<>())})[(
+([({<[<[{({<<[<>{})[<><>]>{{[]{}}}>[[{()<>}([]{})](({}<>)<<>>)]}<{<<<>>{()[]}>}<{<[]()>}>>)(<<<{
+({<{[[({[([{[{[]{}}{[]<>}](((){})({}()))}]([<{<>{}}{()<>}>{({}{})(()())}])}]<{({{<()[]>{()}}
+({[[{[((<[[[{<<>[]>(<>[])}]]{<({{}[]}){[{}{}]<<>()>}>[([<>()]{{}()})(<()()><<>[]>)]}]>(<([{<[]{}>(()())}<{[
+[<<<{<({({{<{[<><>]{{}<>}}{<(){}>}>}})})[<<[{[{({}{})<<>>}[{[]}(()())]]{{([]())([]())}{({}[])[<>
+<<<[[((<{{<(((<>[])(()))<<<>()><<>{}>>)<[{<>[]}{(){}}]{[{}]({}())}>>}}[[((({()}{[][]}){<{}[]>}
+(<[<({[[{[<<[(<>[])]([[]<>]<[]{}>)>({(<>[])([]())}<[{}<>)<<>{}>>)>[{<[[][]]><[{}<>]<[]()>>}<<[
+{[({<<<<(<([{{[][]}}]{<{<>()}<<>()>>[({}())<[]{}>]})>)>>><<<{{((([{}[]]<<><>>)[[[][]]({}[])])<{<{}{}>(
+[[[({((({<([({[][]}{[]})<({}[]}[{}{}]>][([[]()]([]()))<<()<>>>])<[<<()[]><()[]>>]>>([<<{[]()}{[][]}><
+[{{<<<({<({(<<<><>>>{(<>[])[<><>]})<(<<>{}>(()()))[{{}()}{(){}}]}}[(<{[]()}<[]<>>>({<>{}}[{}
+([<<{<[{([<[<{<>{}}<[]{}>><([][]>>][{([][])[()()]}<<[]<>>>]>][{<({<>()}<[][]>)[[[]<>]{()<>}
+({<<[<(<<<(<((()<>)<{}<>>)>)<<([<>{}][<>[]])<<()()>({}[])>>([(()())(()<>)]{{{}<>}<[]{}>})>>>>[
+<{[{<[[<[(<{({<><>}{[]<>}){<[]{}><()>}}({({})[[]{}]})>{(<{[]<>}{<><>}>([{}[]]{<><>}))(<<{}()>[
+<{{<[[({{{<({<[]()>[{}[]]}<{<><>}{()<>}>)[<<[]{}>{{}<>}>[<<>[]>((){})]]>}}(<[[(([][])[{}<>]){(()<>)[()[]]}]((
+[{[{<[(({{({<{{}{}}<()()>>(<[]<>>{<>[]})}(<<()[]>{()<>}>))<<<[{}{}]<<>[]>>>[[{[]{}}]((()<>){<>
+{[[<{({[<(<((<{}[]>){[{}[]]})[{[{}{}]({}())}]>(<{{()<>}(<><>)}[(<><>)<[]{}]]><{<()[]>([][])

2021/day-10/linting.js

@@ -0,0 +1,55 @@
+const pairs = {
+  '(': ')',
+  '[': ']',
+  '{': '}',
+  '<': '>'
+}
+
+const lintLine = (line) => {
+  let expected = ''
+  let pos = 0
+  while (pos < line.length) {
+    const char = line[pos]
+
+    // if opening bracket, add mate to the start of expected list
+    if (pairs[char]) {
+      expected += pairs[char]
+    } else { // if closing bracket
+      // if expected closing, clear from the expected list
+      if (expected[expected.length - 1] === char) {
+        expected = expected.slice(0, -1)
+      } else { // otherwise, found an error to report
+        return {
+          char: pos,
+          expected: expected[expected.length - 1],
+          found: char
+        }
+      }
+    }
+
+    pos++
+  }
+
+  // if we run out of line, ignore per instructions for Step 1
+  if (expected.length > 0) {
+    // TODO - add the reporting when we need it in Step 2?
+  }
+}
+
+const lintAll = (instructions) => {
+  const errors = instructions.map(lintLine) // lint each line
+    .map((error, idx) => {
+      return { ...error, line: idx }
+    }).filter((report) => !!(report.char)) // remove lines without errors
+
+  console.log(`Linting found ${errors.length} errors in ${instructions.length} lines.`)
+  console.debug(instructions)
+  console.debug(errors)
+
+  return errors
+}
+
+module.exports = {
+  lintLine,
+  lintAll
+}

2021/day-10/linting.test.js

@@ -0,0 +1,95 @@
+/* eslint-env mocha */
+const { expect } = require('chai')
+const { lintLine, lintAll } = require('./linting')
+
+const badChunks = [
+  '(]',
+  '{()()()>',
+  '(((()))}',
+  '<([]){()}[{}])'
+]
+
+const testData = `[({(<(())[]>[[{[]{<()<>>
+[(()[<>])]({[<{<<[]>>(
+{([(<{}[<>[]}>{[]{[(<()>
+(((({<>}<{<{<>}{[]{[]{}
+[[<[([]))<([[{}[[()]]]
+[{[{({}]{}}([{[{{{}}([]
+{<[[]]>}<{[{[{[]{()[[[]
+[<(<(<(<{}))><([]([]()
+<{([([[(<>()){}]>(<<{{
+<{([{{}}[<[[[<>{}]]]>[]]`
+
+describe('--- Day 10: Syntax Scoring ---', () => {
+  describe('Part 1', () => {
+    describe('lintLine()', () => {
+      it('finds instnces of closing brackets that mismatch the opening brackets', () => {
+        expect(lintLine(badChunks[0])).to.deep.equal(
+          {
+            char: 1,
+            expected: ')',
+            found: ']'
+          }
+        )
+        expect(lintLine(badChunks[1])).to.deep.equal(
+          {
+            char: 7,
+            expected: '}',
+            found: '>'
+          }
+        )
+        expect(lintLine(badChunks[2])).to.deep.equal(
+          {
+            char: 7,
+            expected: ')',
+            found: '}'
+          }
+        )
+        expect(lintLine(badChunks[3])).to.deep.equal(
+          {
+            char: 13,
+            expected: '>',
+            found: ')'
+          }
+        )
+      })
+    })
+    describe('lintAll', () => {
+      it('finds all lines with linting errors', () => {
+        const errors = lintAll(testData.split('\n'))
+
+        expect(errors.length).to.equal(5)
+        expect(errors[0]).to.deep.equal({
+          line: 2,
+          char: 12,
+          expected: ']',
+          found: '}'
+        })
+        expect(errors[1]).to.deep.equal({
+          line: 4,
+          char: 8,
+          expected: ']',
+          found: ')'
+        })
+        expect(errors[2]).to.deep.equal({
+          line: 5,
+          char: 7,
+          expected: ')',
+          found: ']'
+        })
+        expect(errors[3]).to.deep.equal({
+          line: 7,
+          char: 10,
+          expected: '>',
+          found: ')'
+        })
+        expect(errors[4]).to.deep.equal({
+          line: 8,
+          char: 16,
+          expected: ']',
+          found: '>'
+        })
+      })
+    })
+  })
+})

2021/day-10/solution.js

@@ -0,0 +1,44 @@
+const fs = require('fs')
+const path = require('path')
+const filePath = path.join(__dirname, 'input.txt')
+const { linesToArray } = require('../../2018/inputParser')
+const { lintAll } = require('./linting')
+
+fs.readFile(filePath, { encoding: 'utf8' }, (err, initData) => {
+  if (err) throw err
+
+  initData = linesToArray(initData.trim())
+
+  const resetInput = () => {
+    // Deep copy to ensure we aren't mutating the original data
+    return JSON.parse(JSON.stringify(initData))
+  }
+
+  const part1 = () => {
+    const data = resetInput()
+    const points = {
+      ')': 3,
+      ']': 57,
+      '}': 1197,
+      '>': 25137
+    }
+
+    const errors = lintAll(data)
+
+    return errors.reduce((total, error) => total + points[error.found], 0)
+  }
+
+  const part2 = () => {
+    const data = resetInput()
+    console.debug(data)
+    return 'No answer yet'
+  }
+  const answers = []
+  answers.push(part1())
+  answers.push(part2())
+
+  answers.forEach((ans, idx) => {
+    console.info(`-- Part ${idx + 1} --`)
+    console.info(`Answer: ${ans}`)
+  })
+})

index.js

@@ -1 +1 @@
-require('./2021/day-09/solution')
+require('./2021/day-10/solution')