:sushi:

Closes #12, #227 and #58

1 files changed, 334 insertions, 0 deletions

diff --git a/src/api/common/text/core/syntax-highlighter.ts b/src/api/common/text/core/syntax-highlighter.ts
new file mode 100644
index 0000000000..c0396b1fc6
--- /dev/null
+++ b/src/api/common/text/core/syntax-highlighter.ts
@@ -0,0 +1,334 @@
+function escape(text) {
+	return text
+		.replace(/>/g, '>')
+		.replace(/</g, '&lt;');
+}
+
+// 文字数が多い順にソートします
+// そうしないと、「function」という文字列が与えられたときに「func」が先にマッチしてしまう可能性があるためです
+const _keywords = [
+	'true',
+	'false',
+	'null',
+	'nil',
+	'undefined',
+	'void',
+	'var',
+	'const',
+	'let',
+	'mut',
+	'dim',
+	'if',
+	'then',
+	'else',
+	'switch',
+	'match',
+	'case',
+	'default',
+	'for',
+	'each',
+	'in',
+	'while',
+	'loop',
+	'continue',
+	'break',
+	'do',
+	'goto',
+	'next',
+	'end',
+	'sub',
+	'throw',
+	'try',
+	'catch',
+	'finally',
+	'enum',
+	'delegate',
+	'function',
+	'func',
+	'fun',
+	'fn',
+	'return',
+	'yield',
+	'async',
+	'await',
+	'require',
+	'include',
+	'import',
+	'imports',
+	'export',
+	'exports',
+	'from',
+	'as',
+	'using',
+	'use',
+	'internal',
+	'module',
+	'namespace',
+	'where',
+	'select',
+	'struct',
+	'union',
+	'new',
+	'delete',
+	'this',
+	'super',
+	'base',
+	'class',
+	'interface',
+	'abstract',
+	'static',
+	'public',
+	'private',
+	'protected',
+	'virtual',
+	'partial',
+	'override',
+	'extends',
+	'implements',
+	'constructor'
+];
+
+const keywords = _keywords
+	.concat(_keywords.map(k => k[0].toUpperCase() + k.substr(1)))
+	.concat(_keywords.map(k => k.toUpperCase()))
+	.sort((a, b) => b.length - a.length);
+
+const symbols = [
+	'=',
+	'+',
+	'-',
+	'*',
+	'/',
+	'%',
+	'~',
+	'^',
+	'&',
+	'|',
+	'>',
+	'<',
+	'!',
+	'?'
+];
+
+const elements = [
+	// comment
+	code => {
+		if (code.substr(0, 2) != '//') return null;
+		const match = code.match(/^\/\/(.+?)(\n|$)/);
+		if (!match) return null;
+		const comment = match[0];
+		return {
+			html: `<span class="comment">${escape(comment)}</span>`,
+			next: comment.length
+		};
+	},
+
+	// block comment
+	code => {
+		const match = code.match(/^\/\*([\s\S]+?)\*\//);
+		if (!match) return null;
+		return {
+			html: `<span class="comment">${escape(match[0])}</span>`,
+			next: match[0].length
+		};
+	},
+
+	// string
+	code => {
+		if (!/^['"`]/.test(code)) return null;
+		const begin = code[0];
+		let str = begin;
+		let thisIsNotAString = false;
+		for (let i = 1; i < code.length; i++) {
+			const char = code[i];
+			if (char == '\\') {
+				str += char;
+				str += code[i + 1] || '';
+				i++;
+				continue;
+			} else if (char == begin) {
+				str += char;
+				break;
+			} else if (char == '\n' || i == (code.length - 1)) {
+				thisIsNotAString = true;
+				break;
+			} else {
+				str += char;
+			}
+		}
+		if (thisIsNotAString) {
+			return null;
+		} else {
+			return {
+				html: `<span class="string">${escape(str)}</span>`,
+				next: str.length
+			};
+		}
+	},
+
+	// regexp
+	code => {
+		if (code[0] != '/') return null;
+		let regexp = '';
+		let thisIsNotARegexp = false;
+		for (let i = 1; i < code.length; i++) {
+			const char = code[i];
+			if (char == '\\') {
+				regexp += char;
+				regexp += code[i + 1] || '';
+				i++;
+				continue;
+			} else if (char == '/') {
+				break;
+			} else if (char == '\n' || i == (code.length - 1)) {
+				thisIsNotARegexp = true;
+				break;
+			} else {
+				regexp += char;
+			}
+		}
+
+		if (thisIsNotARegexp) return null;
+		if (regexp == '') return null;
+		if (regexp[0] == ' ' && regexp[regexp.length - 1] == ' ') return null;
+
+		return {
+			html: `<span class="regexp">/${escape(regexp)}/</span>`,
+			next: regexp.length + 2
+		};
+	},
+
+	// label
+	code => {
+		if (code[0] != '@') return null;
+		const match = code.match(/^@([a-zA-Z_-]+?)\n/);
+		if (!match) return null;
+		const label = match[0];
+		return {
+			html: `<span class="label">${label}</span>`,
+			next: label.length
+		};
+	},
+
+	// number
+	(code, i, source) => {
+		const prev = source[i - 1];
+		if (prev && /[a-zA-Z]/.test(prev)) return null;
+		if (!/^[\-\+]?[0-9\.]+/.test(code)) return null;
+		const match = code.match(/^[\-\+]?[0-9\.]+/)[0];
+		if (match) {
+			return {
+				html: `<span class="number">${match}</span>`,
+				next: match.length
+			};
+		} else {
+			return null;
+		}
+	},
+
+	// nan
+	(code, i, source) => {
+		const prev = source[i - 1];
+		if (prev && /[a-zA-Z]/.test(prev)) return null;
+		if (code.substr(0, 3) == 'NaN') {
+			return {
+				html: `<span class="nan">NaN</span>`,
+				next: 3
+			};
+		} else {
+			return null;
+		}
+	},
+
+	// method
+	code => {
+		const match = code.match(/^([a-zA-Z_-]+?)\(/);
+		if (!match) return null;
+
+		if (match[1] == '-') return null;
+
+		return {
+			html: `<span class="method">${match[1]}</span>`,
+			next: match[1].length
+		};
+	},
+
+	// property
+	(code, i, source) => {
+		const prev = source[i - 1];
+		if (prev != '.') return null;
+
+		const match = code.match(/^[a-zA-Z0-9_-]+/);
+		if (!match) return null;
+
+		return {
+			html: `<span class="property">${match[0]}</span>`,
+			next: match[0].length
+		};
+	},
+
+	// keyword
+	(code, i, source) => {
+		const prev = source[i - 1];
+		if (prev && /[a-zA-Z]/.test(prev)) return null;
+
+		const match = keywords.filter(k => code.substr(0, k.length) == k)[0];
+		if (match) {
+			if (/^[a-zA-Z]/.test(code.substr(match.length))) return null;
+			return {
+				html: `<span class="keyword ${match}">${match}</span>`,
+				next: match.length
+			};
+		} else {
+			return null;
+		}
+	},
+
+	// symbol
+	code => {
+		const match = symbols.filter(s => code[0] == s)[0];
+		if (match) {
+			return {
+				html: `<span class="symbol">${match}</span>`,
+				next: 1
+			};
+		} else {
+			return null;
+		}
+	}
+];
+
+// specify lang is todo
+export default (source: string, lang?: string) => {
+	let code = source;
+	let html = '';
+
+	let i = 0;
+
+	function push(token) {
+		html += token.html;
+		code = code.substr(token.next);
+		i += token.next;
+	}
+
+	while (code != '') {
+		const parsed = elements.some(el => {
+			const e = el(code, i, source);
+			if (e) {
+				push(e);
+				return true;
+			} else {
+				return false;
+			}
+		});
+
+		if (!parsed) {
+			push({
+				html: escape(code[0]),
+				next: 1
+			});
+		}
+	}
+
+	return html;
+};