tag:include

src/lexical.js

@@ -0,0 +1,80 @@
+const _ = require('lodash');
+
+// quote related
+var singleQuoted = /'[^']*'/;
+var doubleQuoted = /"[^"]*"/;
+var quoteBalanced = new RegExp(`(?:${singleQuoted.source}|${doubleQuoted.source}|[^'"])*`);
+
+var number = /(?:-?\d+\.?\d*|\.?\d+)/;
+var bool = /true|false/;
+var identifier = /[a-zA-Z_$][a-zA-Z_$0-9]*/;
+var subscript = /\[\d+\]/;
+
+var quoted = new RegExp(`(?:${singleQuoted.source}|${doubleQuoted.source})`);
+var literal = new RegExp(`(?:${quoted.source}|${bool.source}|${number.source})`);
+var variable = new RegExp(`${identifier.source}(?:\\.${identifier.source}|${subscript.source})*`);
+
+// range related
+var rangeLimit = new RegExp(`(?:${variable.source}|${number.source})`);
+var range = new RegExp(`\\(${rangeLimit.source}\\.\\.${rangeLimit.source}\\)`);
+var rangeCapture = new RegExp(`\\((${rangeLimit.source})\\.\\.(${rangeLimit.source})\\)`);
+
+var value = new RegExp(`(?:${literal.source}|${variable.source}|${range.source})`);
+
+// hash related
+var hash = new RegExp(`(?:${identifier.source})\\s*:\\s*(?:${value.source})`);
+var hashCapture = new RegExp(`(${identifier.source})\\s*:\\s*(${value.source})`, 'g');
+
+var tagLine = new RegExp(`^\\s*(${identifier.source})\\s*(.*)\\s*$`);
+var literalLine = new RegExp(`^${literal.source}$`, 'i');
+var variableLine = new RegExp(`^${variable.source}$`);
+var numberLine = new RegExp(`^${number.source}$`);
+var boolLine = new RegExp(`^${bool.source}$`, 'i');
+var quotedLine = new RegExp(`^${quoted.source}$`);
+var rangeLine = new RegExp(`^${rangeCapture.source}$`);
+
+// filter related
+var valueList = new RegExp(`${value.source}(\\s*,\\s*${value.source})*`);
+var filter = new RegExp(`${identifier.source}(?:\\s*:\\s*${valueList.source})?`, 'g');
+var filterCapture = new RegExp(`(${identifier.source})(?:\\s*:\\s*(${valueList.source}))?`);
+var filterLine = new RegExp(`^${filterCapture.source}$`);
+
+var operators = [
+    /\s+or\s+/,
+    /\s+and\s+/,
+    /==|!=|<=|>=|<|>|\s+contains\s+/
+];
+
+function isLiteral(str) {
+    return literalLine.test(str);
+}
+
+function isRange(str) {
+    return rangeLine.test(str);
+}
+
+function isVariable(str) {
+    return variableLine.test(str);
+}
+
+function parseLiteral(str) {
+    var res;
+    if (res = str.match(numberLine)) {
+        return Number(str);
+    }
+    if (res = str.match(boolLine)) {
+        return str.toLowerCase() === 'true';
+    }
+    if (res = str.match(quotedLine)) {
+        return str.slice(1, -1);
+    }
+}
+
+module.exports = {
+    quoted, number, bool, literal, filter,
+    hash, hashCapture,
+    range, rangeCapture, 
+    identifier, value, quoteBalanced, operators,
+    quotedLine, numberLine, boolLine, rangeLine, literalLine, filterLine, tagLine,
+    isLiteral, isVariable, parseLiteral, isRange
+};