From 29f12552ec3d2538def957b617272ae3e247cb9b Mon Sep 17 00:00:00 2001
From: Rene Saarsoo <nene@triin.net>
Date: Thu, 17 Sep 2020 23:40:40 +0300
Subject: [PATCH] Parsing of parameters

---
 src/index.ts | 97 +++++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 89 insertions(+), 8 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index b90cabf..9de4c9c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,18 +1,94 @@
 import * as fs from "fs";
 
-type Def = {
-  type: string;
-  text: string;
+enum RuleType {
+  Name = "Name",
+  Author = "Author",
+  Description = "Description",
+  Warmup = "Warmup",
+  Rest = "Rest",
+  Interval = "Interval",
+  Cooldown = "Cooldown",
+}
+
+type Rule = {
+  type: RuleType;
+  params: Param[];
 };
 
-const parseDefinition = (line: string): Def | undefined => {
+enum ParamType {
+  Text = "Text",
+  Power = "Power",
+  PowerRange = "PowerRange",
+  Cadence = "Cadence",
+  Duration = "Duration",
+}
+
+type TextParam = { type: ParamType.Text; value: string };
+type PowerParam = { type: ParamType.Power; value: number };
+type PowerRangeParam = { type: ParamType.PowerRange; value: [number, number] };
+type CadenceParam = { type: ParamType.Cadence; value: number };
+type DurationParam = { type: ParamType.Duration; value: number };
+
+type Param =
+  | TextParam
+  | PowerParam
+  | PowerRangeParam
+  | CadenceParam
+  | DurationParam;
+
+const toInteger = (str: string): number => {
+  return parseInt(str.replace(/[^0-9]/, ""), 10);
+};
+
+const toSeconds = (str: string): number => {
+  const [seconds, minutes, hours] = str.split(":").map(toInteger).reverse();
+  return seconds + minutes * 60 + (hours || 0) * 60 * 60;
+};
+
+const parseValueParam = (text: string): Param => {
+  if (/^[0-9:]+$/.test(text)) {
+    return { type: ParamType.Duration, value: toSeconds(text) };
+  }
+  if (/^[0-9]+rpm$/.test(text)) {
+    return { type: ParamType.Cadence, value: toInteger(text) };
+  }
+  if (/^[0-9]+%..[0-9]+%$/.test(text)) {
+    const [from, to] = text.split("..").map(toInteger);
+    return { type: ParamType.PowerRange, value: [from, to] };
+  }
+  if (/^[0-9]+%$/.test(text)) {
+    return { type: ParamType.Power, value: toInteger(text) };
+  }
+  throw new Error(`Unrecognized parameter "${text}"`);
+};
+
+const parseParams = (type: RuleType, text: string): Param[] => {
+  switch (type) {
+    case RuleType.Name:
+    case RuleType.Author:
+    case RuleType.Description:
+      return [{ type: ParamType.Text, value: text }];
+    case RuleType.Warmup:
+    case RuleType.Rest:
+    case RuleType.Interval:
+    case RuleType.Cooldown:
+      return text.split(" ").map(parseValueParam);
+  }
+};
+
+const parseRule = (line: string): Rule | undefined => {
   const matches = line.match(/^(\w+):(.*)$/);
   if (!matches) {
     return undefined;
   }
+  if (!Object.keys(RuleType).includes(matches[1])) {
+    return undefined;
+  }
+  const type: RuleType = matches[1] as RuleType;
+
   return {
-    type: matches[1],
-    text: matches[2],
+    type,
+    params: parseParams(type, matches[2].trim()),
   };
 };
 
@@ -26,6 +102,11 @@ const file = fs.readFileSync(filename, "utf8");
 
 file
   .split(/\n/)
-  .map(parseDefinition)
+  .map(parseRule)
   .filter(isDefined)
-  .forEach((def) => console.log(def.type));
+  .forEach((rule) => {
+    console.log(rule.type);
+    rule.params.forEach((p) => {
+      console.log(`  ${p.type}: ${p.value}`);
+    });
+  });