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549 lines
15 KiB
549 lines
15 KiB
let LabelAccumulator = require('./LabelAccumulator').default;
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let ComponentUtil = require('./ComponentUtil').default;
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/**
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* Helper class for Label which explodes the label text into lines and blocks within lines
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*
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* @private
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*/
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class LabelSplitter {
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/**
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* @param {CanvasRenderingContext2D} ctx Canvas rendering context
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* @param {Label} parent reference to the Label instance using current instance
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* @param {boolean} selected
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* @param {boolean} hover
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*/
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constructor(ctx, parent, selected, hover) {
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this.ctx = ctx;
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this.parent = parent;
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/**
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* Callback to determine text width; passed to LabelAccumulator instance
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*
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* @param {String} text string to determine width of
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* @param {String} mod font type to use for this text
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* @return {Object} { width, values} width in pixels and font attributes
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*/
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let textWidth = (text, mod) => {
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if (text === undefined) return 0;
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// TODO: This can be done more efficiently with caching
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let values = this.parent.getFormattingValues(ctx, selected, hover, mod);
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let width = 0;
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if (text !== '') {
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// NOTE: The following may actually be *incorrect* for the mod fonts!
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// This returns the size with a regular font, bold etc. may
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// have different sizes.
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let measure = this.ctx.measureText(text);
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width = measure.width;
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}
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return {width, values: values};
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};
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this.lines = new LabelAccumulator(textWidth);
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}
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/**
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* Split passed text of a label into lines and blocks.
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*
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* # NOTE
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*
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* The handling of spacing is option dependent:
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*
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* - if `font.multi : false`, all spaces are retained
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* - if `font.multi : true`, every sequence of spaces is compressed to a single space
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*
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* This might not be the best way to do it, but this is as it has been working till now.
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* In order not to break existing functionality, for the time being this behaviour will
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* be retained in any code changes.
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*
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* @param {string} text text to split
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* @returns {Array<line>}
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*/
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process(text) {
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if (!ComponentUtil.isValidLabel(text)) {
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return this.lines.finalize();
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}
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var font = this.parent.fontOptions;
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// Normalize the end-of-line's to a single representation - order important
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text = text.replace(/\r\n/g, '\n'); // Dos EOL's
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text = text.replace(/\r/g, '\n'); // Mac EOL's
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// Note that at this point, there can be no \r's in the text.
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// This is used later on splitStringIntoLines() to split multifont texts.
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let nlLines = String(text).split('\n');
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let lineCount = nlLines.length;
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if (font.multi) {
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// Multi-font case: styling tags active
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for (let i = 0; i < lineCount; i++) {
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let blocks = this.splitBlocks(nlLines[i], font.multi);
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// Post: Sequences of tabs and spaces are reduced to single space
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if (blocks === undefined) continue;
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if (blocks.length === 0) {
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this.lines.newLine("");
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continue;
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}
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if (font.maxWdt > 0) {
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// widthConstraint.maximum defined
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//console.log('Running widthConstraint multi, max: ' + this.fontOptions.maxWdt);
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for (let j = 0; j < blocks.length; j++) {
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let mod = blocks[j].mod;
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let text = blocks[j].text;
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this.splitStringIntoLines(text, mod, true);
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}
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} else {
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// widthConstraint.maximum NOT defined
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for (let j = 0; j < blocks.length; j++) {
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let mod = blocks[j].mod;
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let text = blocks[j].text;
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this.lines.append(text, mod);
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}
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}
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this.lines.newLine();
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}
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} else {
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// Single-font case
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if (font.maxWdt > 0) {
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// widthConstraint.maximum defined
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// console.log('Running widthConstraint normal, max: ' + this.fontOptions.maxWdt);
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for (let i = 0; i < lineCount; i++) {
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this.splitStringIntoLines(nlLines[i]);
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}
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} else {
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// widthConstraint.maximum NOT defined
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for (let i = 0; i < lineCount; i++) {
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this.lines.newLine(nlLines[i]);
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}
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}
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}
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return this.lines.finalize();
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}
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/**
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* normalize the markup system
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*
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* @param {boolean|'md'|'markdown'|'html'} markupSystem
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* @returns {string}
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*/
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decodeMarkupSystem(markupSystem) {
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let system = 'none';
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if (markupSystem === 'markdown' || markupSystem === 'md') {
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system = 'markdown';
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} else if (markupSystem === true || markupSystem === 'html') {
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system = 'html'
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}
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return system;
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}
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/**
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*
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* @param {string} text
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* @returns {Array}
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*/
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splitHtmlBlocks(text) {
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let blocks = [];
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// TODO: consolidate following + methods/closures with splitMarkdownBlocks()
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// NOTE: sequences of tabs and spaces are reduced to single space; scan usage of `this.spacing` within method
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let s = {
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bold: false,
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ital: false,
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mono: false,
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spacing: false,
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position: 0,
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buffer: "",
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modStack: []
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};
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s.mod = function() {
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return (this.modStack.length === 0) ? 'normal' : this.modStack[0];
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};
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s.modName = function() {
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if (this.modStack.length === 0)
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return 'normal';
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else if (this.modStack[0] === 'mono')
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return 'mono';
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else {
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if (s.bold && s.ital) {
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return 'boldital';
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} else if (s.bold) {
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return 'bold';
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} else if (s.ital) {
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return 'ital';
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}
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}
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};
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s.emitBlock = function(override=false) { // eslint-disable-line no-unused-vars
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if (this.spacing) {
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this.add(" ");
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this.spacing = false;
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}
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if (this.buffer.length > 0) {
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blocks.push({ text: this.buffer, mod: this.modName() });
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this.buffer = "";
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}
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};
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s.add = function(text) {
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if (text === " ") {
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s.spacing = true;
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}
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if (s.spacing) {
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this.buffer += " ";
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this.spacing = false;
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}
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if (text != " ") {
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this.buffer += text;
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}
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};
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while (s.position < text.length) {
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let ch = text.charAt(s.position);
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if (/[ \t]/.test(ch)) {
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if (!s.mono) {
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s.spacing = true;
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} else {
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s.add(ch);
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}
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} else if (/</.test(ch)) {
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if (!s.mono && !s.bold && /<b>/.test(text.substr(s.position,3))) {
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s.emitBlock();
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s.bold = true;
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s.modStack.unshift("bold");
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s.position += 2;
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} else if (!s.mono && !s.ital && /<i>/.test(text.substr(s.position,3))) {
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s.emitBlock();
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s.ital = true;
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s.modStack.unshift("ital");
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s.position += 2;
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} else if (!s.mono && /<code>/.test(text.substr(s.position,6))) {
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s.emitBlock();
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s.mono = true;
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s.modStack.unshift("mono");
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s.position += 5;
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} else if (!s.mono && (s.mod() === 'bold') && /<\/b>/.test(text.substr(s.position,4))) {
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s.emitBlock();
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s.bold = false;
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s.modStack.shift();
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s.position += 3;
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} else if (!s.mono && (s.mod() === 'ital') && /<\/i>/.test(text.substr(s.position,4))) {
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s.emitBlock();
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s.ital = false;
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s.modStack.shift();
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s.position += 3;
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} else if ((s.mod() === 'mono') && /<\/code>/.test(text.substr(s.position,7))) {
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s.emitBlock();
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s.mono = false;
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s.modStack.shift();
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s.position += 6;
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} else {
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s.add(ch);
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}
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} else if (/&/.test(ch)) {
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if (/</.test(text.substr(s.position,4))) {
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s.add("<");
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s.position += 3;
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} else if (/&/.test(text.substr(s.position,5))) {
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s.add("&");
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s.position += 4;
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} else {
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s.add("&");
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}
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} else {
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s.add(ch);
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}
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s.position++
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}
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s.emitBlock();
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return blocks;
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}
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/**
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*
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* @param {string} text
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* @returns {Array}
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*/
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splitMarkdownBlocks(text) {
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let blocks = [];
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// TODO: consolidate following + methods/closures with splitHtmlBlocks()
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// NOTE: sequences of tabs and spaces are reduced to single space; scan usage of `this.spacing` within method
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let s = {
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bold: false,
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ital: false,
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mono: false,
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beginable: true,
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spacing: false,
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position: 0,
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buffer: "",
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modStack: []
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};
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s.mod = function() {
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return (this.modStack.length === 0) ? 'normal' : this.modStack[0];
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};
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s.modName = function() {
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if (this.modStack.length === 0)
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return 'normal';
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else if (this.modStack[0] === 'mono')
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return 'mono';
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else {
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if (s.bold && s.ital) {
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return 'boldital';
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} else if (s.bold) {
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return 'bold';
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} else if (s.ital) {
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return 'ital';
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}
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}
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};
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s.emitBlock = function(override=false) { // eslint-disable-line no-unused-vars
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if (this.spacing) {
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this.add(" ");
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this.spacing = false;
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}
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if (this.buffer.length > 0) {
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blocks.push({ text: this.buffer, mod: this.modName() });
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this.buffer = "";
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}
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};
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s.add = function(text) {
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if (text === " ") {
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s.spacing = true;
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}
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if (s.spacing) {
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this.buffer += " ";
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this.spacing = false;
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}
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if (text != " ") {
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this.buffer += text;
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}
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};
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while (s.position < text.length) {
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let ch = text.charAt(s.position);
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if (/[ \t]/.test(ch)) {
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if (!s.mono) {
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s.spacing = true;
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} else {
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s.add(ch);
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}
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s.beginable = true
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} else if (/\\/.test(ch)) {
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if (s.position < text.length+1) {
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s.position++;
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ch = text.charAt(s.position);
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if (/ \t/.test(ch)) {
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s.spacing = true;
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} else {
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s.add(ch);
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s.beginable = false;
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}
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}
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} else if (!s.mono && !s.bold && (s.beginable || s.spacing) && /\*/.test(ch)) {
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s.emitBlock();
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s.bold = true;
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s.modStack.unshift("bold");
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} else if (!s.mono && !s.ital && (s.beginable || s.spacing) && /\_/.test(ch)) {
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s.emitBlock();
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s.ital = true;
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s.modStack.unshift("ital");
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} else if (!s.mono && (s.beginable || s.spacing) && /`/.test(ch)) {
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s.emitBlock();
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s.mono = true;
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s.modStack.unshift("mono");
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} else if (!s.mono && (s.mod() === "bold") && /\*/.test(ch)) {
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if ((s.position === text.length-1) || /[.,_` \t\n]/.test(text.charAt(s.position+1))) {
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s.emitBlock();
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s.bold = false;
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s.modStack.shift();
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} else {
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s.add(ch);
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}
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} else if (!s.mono && (s.mod() === "ital") && /\_/.test(ch)) {
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if ((s.position === text.length-1) || /[.,*` \t\n]/.test(text.charAt(s.position+1))) {
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s.emitBlock();
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s.ital = false;
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s.modStack.shift();
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} else {
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s.add(ch);
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}
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} else if (s.mono && (s.mod() === "mono") && /`/.test(ch)) {
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if ((s.position === text.length-1) || (/[.,*_ \t\n]/.test(text.charAt(s.position+1)))) {
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s.emitBlock();
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s.mono = false;
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s.modStack.shift();
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} else {
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s.add(ch);
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}
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} else {
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s.add(ch);
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s.beginable = false;
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}
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s.position++
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}
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s.emitBlock();
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return blocks;
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}
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/**
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* Explodes a piece of text into single-font blocks using a given markup
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*
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* @param {string} text
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* @param {boolean|'md'|'markdown'|'html'} markupSystem
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* @returns {Array.<{text: string, mod: string}>}
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* @private
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*/
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splitBlocks(text, markupSystem) {
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let system = this.decodeMarkupSystem(markupSystem);
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if (system === 'none') {
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return [{
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text: text,
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mod: 'normal'
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}]
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} else if (system === 'markdown') {
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return this.splitMarkdownBlocks(text);
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} else if (system === 'html') {
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return this.splitHtmlBlocks(text);
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}
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}
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/**
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* @param {string} text
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* @returns {boolean} true if text length over the current max with
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* @private
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*/
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overMaxWidth(text) {
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let width = this.ctx.measureText(text).width;
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return (this.lines.curWidth() + width > this.parent.fontOptions.maxWdt);
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}
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/**
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* Determine the longest part of the sentence which still fits in the
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* current max width.
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*
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* @param {Array} words Array of strings signifying a text lines
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* @return {number} index of first item in string making string go over max
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* @private
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*/
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getLongestFit(words) {
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let text = '';
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let w = 0;
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while (w < words.length) {
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let pre = (text === '') ? '' : ' ';
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let newText = text + pre + words[w];
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if (this.overMaxWidth(newText)) break;
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text = newText;
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w++;
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}
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return w;
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}
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/**
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* Determine the longest part of the string which still fits in the
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* current max width.
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*
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* @param {Array} words Array of strings signifying a text lines
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* @return {number} index of first item in string making string go over max
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*/
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getLongestFitWord(words) {
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let w = 0;
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while (w < words.length) {
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if (this.overMaxWidth(words.slice(0,w))) break;
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w++;
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}
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return w;
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}
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/**
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* Split the passed text into lines, according to width constraint (if any).
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*
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* The method assumes that the input string is a single line, i.e. without lines break.
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*
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* This method retains spaces, if still present (case `font.multi: false`).
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* A space which falls on an internal line break, will be replaced by a newline.
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* There is no special handling of tabs; these go along with the flow.
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*
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* @param {string} str
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* @param {string} [mod='normal']
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* @param {boolean} [appendLast=false]
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* @private
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*/
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splitStringIntoLines(str, mod = 'normal', appendLast = false) {
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// Still-present spaces are relevant, retain them
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str = str.replace(/^( +)/g, '$1\r');
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str = str.replace(/([^\r][^ ]*)( +)/g, '$1\r$2\r');
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let words = str.split('\r');
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while (words.length > 0) {
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let w = this.getLongestFit(words);
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if (w === 0) {
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// Special case: the first word is already larger than the max width.
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let word = words[0];
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// Break the word to the largest part that fits the line
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let x = this.getLongestFitWord(word);
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this.lines.newLine(word.slice(0, x), mod);
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// Adjust the word, so that the rest will be done next iteration
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words[0] = word.slice(x);
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} else {
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// skip any space that is replaced by a newline
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let newW = w;
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if (words[w - 1] === ' ') {
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w--;
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} else if (words[newW] === ' ') {
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newW++;
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}
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let text = words.slice(0, w).join("");
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if (w == words.length && appendLast) {
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this.lines.append(text, mod);
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} else {
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this.lines.newLine(text, mod);
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}
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// Adjust the word, so that the rest will be done next iteration
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words = words.slice(newW);
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}
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}
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}
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}
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export default LabelSplitter;
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