add csv download

1 files changed, 79 insertions, 0 deletions

diff --git a/csv-parse.mjs b/csv-parse.mjs
new file mode 100644
index 0000000..b096ab4
--- /dev/null
+++ b/csv-parse.mjs
@@ -0,0 +1,79 @@
+export default class {
+    constructor() {
+        this.state = this.awaitingTokenOrComma;
+        this.inProgress = '';
+        this._rowResults = [];
+        this._results = [];
+    }
+
+    push(c) {
+        this.state(c);
+    }
+
+    get results() {
+        return this._results.concat([this._rowResults.concat([this.inProgress])]);
+    }
+
+    awaitingTokenOrComma(c) {
+        switch (c) {
+        case ',':
+            // empty column
+            this._rowResults.push('');
+            break;
+        case '\n':
+            this._results.push(this._rowResults);
+            this._rowResults = [];
+            break;
+        default:
+            if (/\s/.test(c)) {
+                return;
+            }
+            this.inProgress += c;
+            this.state = this.awaitingComma;
+        }
+    }
+
+    awaitingComma(c) {
+        switch (c) {
+        case ',':
+            this._rowResults.push(this.inProgress);
+            this.inProgress = '';
+            this.state = this.awaitingTokenOrComma;
+            break;
+        case '\r':
+            break;
+        case '\n':
+            this._results.push(this._rowResults.concat(this.inProgress));
+            this._rowResults = [];
+            this.inProgress = '';
+            this.state = this.awaitingTokenOrComma;
+            break;
+        case '"':
+            this.state = this.checkForDoubleQuote;
+            break;
+        default:
+            this.inProgress += c;
+        }
+    }
+
+    checkForDoubleQuote(c) {
+        this.inProgress += c
+        switch (c) {
+        case '"':
+            this.state = this.awaitingComma;
+            break;
+        default:
+            this.state = this.awaitingQuote;
+        }
+    }
+
+    awaitingQuote(c) {
+        switch (c) {
+        case '"':
+            this.state = this.awaitingComma;
+            break;
+        default:
+            this.inProgress += c;
+        }
+    }
+}