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79 lines
2.1 KiB
79 lines
2.1 KiB
<script setup lang="ts">
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import {defineEmits, ref} from 'vue'
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import {MathStatement} from '../support/parse'
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import Katex from '../components/Katex.vue'
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import { v4 as uuidv4 } from 'uuid'
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import {StatementID} from '../types'
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const emit = defineEmits<{
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(eventName: 'save', statement: MathStatement): void
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}>()
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const expressionPreview = ref(MathStatement.temp(''))
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const expressionPreviewKey = ref(uuidv4())
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const expressionError = ref<string|undefined>(undefined)
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const expressionValue = ref<string>('')
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const updateExpressionPreview = () => {
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const previewStmt = MathStatement.temp(expressionValue.value)
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if ( previewStmt.isValid() ) {
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expressionPreview.value = MathStatement.temp(expressionValue.value)
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expressionPreviewKey.value = uuidv4()
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}
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}
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const validateExpression = () => {
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const stmt = MathStatement.temp(expressionValue.value)
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if ( !stmt.isValid() ) {
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return 'The expression is invalid'
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}
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if ( stmt.defines().length > 0 ) {
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return 'Expressions cannot declare variables'
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}
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}
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const saveExpression = () => {
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expressionError.value = validateExpression()
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if ( expressionError.value ) {
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return
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}
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emit('save', new MathStatement(
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uuidv4() as StatementID,
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expressionValue.value
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))
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}
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</script>
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<template>
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<q-card>
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<q-card-section>
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<div style="display: flex; justify-content: center">
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<Katex
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:key="expressionPreviewKey"
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:statement="expressionPreview"
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/>
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</div>
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</q-card-section>
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<q-card-section v-if="expressionError">
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<div style="color: darkred; font-weight: bold">{{ expressionError }}</div>
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</q-card-section>
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<q-card-section>
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<q-input
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v-model="expressionValue"
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v-on:update:model-value="() => updateExpressionPreview()"
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outlined
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autogrow
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type="textarea"
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autofocus
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label="Expression"
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/>
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</q-card-section>
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<q-card-actions align="right" class="text-primary">
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<q-btn flat label="Cancel" v-close-popup></q-btn>
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<q-btn flat label="Save" @click="() => saveExpression()"></q-btn>
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</q-card-actions>
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</q-card>
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</template>
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