first working number scaling

vue3/src/components/display/InstructionsCompileComponent.vue

@@ -0,0 +1,34 @@
+<template>
+    <component :is="compiled" :ingredient_factor="ingredient_factor" :code="code"></component>
+</template>
+
+<script>
+
+import {defineComponent} from "vue";
+
+import ScalableNumber from "@/components/display/ScalableNumber.vue";
+
+
+export default defineComponent({
+    name: 'InstructionsCompileComponent',
+    computed: {},
+    components: {ScalableNumber},
+    props: [
+        'code', 'ingredient_factor'
+    ],
+    data() {
+        return {
+            compiled: defineComponent( {
+                name: 'compiled-instructions-component',
+                props: ['ingredient_factor', 'code'],
+                components: {  ScalableNumber, },
+                template: `<div>${this.code}</div>`
+            })
+        }
+    },
+    mounted() {
+
+    },
+})
+</script>
+

vue3/src/components/display/ScalableNumber.vue

@@ -0,0 +1,25 @@
+<template>
+  <span class="step__scalable-num" :class="[this.factor===1 ? 'step__scalable-num_scaled_false' : (this.factor > 1 ? 'step__scalable-num_scaled_up':'step__scalable-num_scaled_down')]" v-html="calculateAmount(number)"></span>
+</template>
+
+<script>
+
+
+import {calculateFoodAmount} from "@/utils/number_utils.ts";
+
+export default {
+  name: 'ScalableNumber',
+  props: {
+    number: Number,
+    factor: {
+      type: Number,
+      default: 4
+    },
+  },
+  methods: {
+    calculateAmount: function (x) {
+      return calculateFoodAmount(x, this.factor)
+    }
+  }
+}
+</script>

vue3/src/components/display/Step.vue

@@ -19,8 +19,8 @@
 
         <IngredientsTable :ingredients="step.ingredients"></IngredientsTable>
 
-        <v-card-text v-if="step.instruction?.length > 0">
-            {{ step.instruction }}
+        <v-card-text v-if="step.instructionsMarkdown.length > 0">
+           <instructions-compile-component :code="step.instructionsMarkdown" :ingredient_factor="1"></instructions-compile-component>
         </v-card-text>
     </v-card>
 </template>
@@ -31,6 +31,8 @@ import IngredientsTable from "@/components/display/IngredientsTable.vue";
 import {Step} from "@/openapi";
 import {DateTime, Duration, Interval} from "luxon";
 
+import InstructionsCompileComponent from "@/components/display/InstructionsCompileComponent.vue";
+
 export default defineComponent({
     name: "Step",
     computed: {
@@ -59,7 +61,7 @@ export default defineComponent({
             return ''
         }
     },
-    components: {IngredientsTable},
+    components: {InstructionsCompileComponent, IngredientsTable},
     props: {
         step: {
             type: {} as PropType<Step>,

vue3/src/utils/number_utils.ts

@@ -0,0 +1,82 @@
+function getUserPreference(pref: string) {
+    return false // TODO only placeholder, add real function
+}
+
+
+/**
+ * round to the number of decimals specified in user preferences
+ * @param num number to round
+ */
+export function roundDecimals(num: number) {
+    let decimals = 2 //TODO get user preference
+    return num.toFixed(decimals)
+}
+
+/**
+ * calculates the amount of food, based on the factor and converts it to a fraction if that is the users preference
+ * @param amount food amount to calculate based upon
+ * @param factor factor to scale food amount by
+ */
+export function calculateFoodAmount(amount: number, factor: number) {
+    if (getUserPreference("use_fractions")) {
+        let return_string = ""
+        let fraction = frac(amount * factor, 16, true)
+
+        if (fraction[0] === 0 && fraction[1] === 0 && fraction[2] === 1) {
+            return roundDecimals(amount * factor)
+        }
+
+        if (fraction[0] > 0) {
+            return_string += fraction[0]
+        }
+
+        if (fraction[1] > 0) {
+            return_string += ` <sup>${fraction[1]}</sup>&frasl;<sub>${fraction[2]}</sub>`
+        }
+
+        return return_string
+    } else {
+        return roundDecimals(amount * factor)
+    }
+}
+
+
+/* frac.js (C) 2012-present SheetJS -- http://sheetjs.com */
+
+/* https://www.npmjs.com/package/frac Apache license*/
+/**
+ * calculates the closest approximation of a fraction for a given decimal number
+ * @param x decimal number to convert into fraction
+ * @param D the maximum denominator to return
+ * @param mixed true to return mixed fractions (e.g. 2 1/2) or false to return improper fractions (e.g. 5/2)
+ * @returns [quot, num, den] array of numbers, quot is either 0 for improper fractions or the whole number, num is the numerator of the fraction and den the denominator
+ */
+export function frac(x, D, mixed) {
+    let n1 = Math.floor(x), d1 = 1;
+    let n2 = n1 + 1, d2 = 1;
+    if (x !== n1) while (d1 <= D && d2 <= D) {
+        let m = (n1 + n2) / (d1 + d2);
+        if (x === m) {
+            if (d1 + d2 <= D) {
+                d1 += d2;
+                n1 += n2;
+                d2 = D + 1;
+            } else if (d1 > d2) d2 = D + 1;
+            else d1 = D + 1;
+            break;
+        } else if (x < m) {
+            n2 = n1 + n2;
+            d2 = d1 + d2;
+        } else {
+            n1 = n1 + n2;
+            d1 = d1 + d2;
+        }
+    }
+    if (d1 > D) {
+        d1 = d2;
+        n1 = n2;
+    }
+    if (!mixed) return [0, n1, d1];
+    let q = Math.floor(n1 / d1);
+    return [q, n1 - q * d1, d1];
+}