refactoring

langserver/method-signatures.js

@@ -0,0 +1,63 @@
+const { Method } = require('java-mti');
+const { indexAt } = require('./document');
+const { formatDoc } = require('./doc-formatter');
+const { trace } = require('./logging');
+
+/**
+ * @param {import('vscode-languageserver').SignatureHelpParams} request
+ * @param {*} liveParsers
+ */
+async function getSignatureHelp(request, liveParsers) {
+    trace('getSignatureHelp');
+    /** @type {import('vscode-languageserver').SignatureHelp} */
+    let sighelp = {
+        signatures: [],
+        activeSignature: 0,
+        activeParameter: 0,
+    }
+    const docinfo = liveParsers.get(request.textDocument.uri);
+    if (!docinfo || !docinfo.parsed) {
+        return sighelp;
+    }
+    await docinfo.reparseWaiter;
+    const index = indexAt(request.position, docinfo.content);
+    const token = docinfo.parsed.unit.getTokenAt(index);
+    if (!token || !token.methodCallInfo) {
+        trace('onSignatureHelp - no method call info');
+        return sighelp;
+    }
+    trace(`onSignatureHelp - ${token.methodCallInfo.methods.length} methods`);
+    sighelp = {
+        signatures: token.methodCallInfo.methods.map(m => {
+            const documentation = formatDoc(`#### ${m.owner.simpleTypeName}${m instanceof Method ? `.${m.name}` : ''}()`, m.docs);
+            const param_docs = new Map();
+            if (documentation) {
+                for (let m, re=/@param\s+(\S+)([\d\D]+?)(?=\n\n|\n[ \t*]*@\w+|$)/g; m = re.exec(documentation.value);) {
+                    param_docs.set(m[1], m[2]);
+                }
+            }
+            /** @type {import('vscode-languageserver').SignatureInformation} */
+            let si = {
+                label: m.label,
+                documentation,
+                parameters: m.parameters.map(p => {
+                    /** @type {import('vscode-languageserver').ParameterInformation} */
+                    let pi = {
+                        documentation: {
+                            kind: 'markdown',
+                            value: param_docs.has(p.name) ? `**${p.name}**: ${param_docs.get(p.name)}` : '',
+                        },
+                        label: p.label
+                    }
+                    return pi;
+                })
+            }
+            return si;
+        }),
+        activeSignature: token.methodCallInfo.methodIdx,
+        activeParameter: token.methodCallInfo.argIdx,
+    }
+    return sighelp;
+}
+
+exports.getSignatureHelp = getSignatureHelp;