implement replace function (#87)

Author: jasonliao-cb

.gitignore

@@ -6,3 +6,4 @@ dist/
 node_modules/
 
 package-lock.json
+.history/

src/xpath/expressions/function-call-expr.ts

@@ -35,7 +35,7 @@ import {
     formatNumber
 } from '../functions';
 import { extCardinal, extIf, extJoin } from '../functions/non-standard';
-import { lowerCase, upperCase } from '../functions/standard-20';
+import { lowerCase, _replace, upperCase } from '../functions/standard-20';
 import { BooleanValue } from '../values/boolean-value';
 import { Expression } from './expression';
 
@@ -60,6 +60,7 @@ export class FunctionCallExpr extends Expression {
         last,
         'local-name': localName,
         'lower-case': lowerCase,
+        'replace': _replace,
         matches,
         name: _name,
         'namespace-uri': namespaceUri,

src/xpath/functions/standard-20.ts

@@ -13,3 +13,13 @@ export function lowerCase(context: ExprContext) {
     const str: string = this.args[0].evaluate(context).stringValue();
     return new StringValue(str.toLowerCase());
 }
+
+export function _replace(context: ExprContext) {
+    assert(['2.0', '3.0'].includes(context.xsltVersion));
+    const str: string = this.args[0].evaluate(context).stringValue();
+    const s1 = this.args[1].evaluate(context).stringValue();
+    const s2 = this.args[2].evaluate(context).stringValue();
+
+    const searchPattern = new RegExp(s1, 'g');
+    return new StringValue(str.replace(searchPattern, s2));
+}

tests/xpath/functions.test.tsx

@@ -286,5 +286,51 @@ describe('XPath Functions', () => {
 
             assert.equal(outXmlString, 'lily');
         });
+
+        it('replace simple text', () => {
+            const xmlString = (
+                <root></root>
+            );
+
+            const xsltString = (
+                <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
+                    <xsl:template match="/">
+                        <xsl:value-of select="replace('Lily','Li','*')" />
+                    </xsl:template>
+                </xsl:stylesheet>
+            )
+
+            const xsltClass = new Xslt();
+
+            const xml = xmlParser.xmlParse(xmlString);
+            const xslt = xmlParser.xmlParse(xsltString);
+
+            const outXmlString = xsltClass.xsltProcess(xml, xslt);
+
+            assert.equal(outXmlString, '*ly');
+        });
+
+        it('replace regex text', () => {
+            const xmlString = (
+                <root></root>
+            );
+
+            const xsltString = (
+                <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">
+                    <xsl:template match="/">
+                        <xsl:value-of select="replace('This is some 123 text 456 with 789 numbers.', '[^\d]+', '')" />
+                    </xsl:template>
+                </xsl:stylesheet>
+            )
+
+            const xsltClass = new Xslt();
+
+            const xml = xmlParser.xmlParse(xmlString);
+            const xslt = xmlParser.xmlParse(xsltString);
+
+            const outXmlString = xsltClass.xsltProcess(xml, xslt);
+
+            assert.equal(outXmlString, '123456789');
+        });
     });
 });