From 1746f21bc3720585d2fe877db8d69aae301ff02c Mon Sep 17 00:00:00 2001
From: Rowan Goemans <RB.Goemans@student.han.nl>
Date: Sun, 31 Dec 2017 02:03:08 +0100
Subject: -- Added many unit tests for the C parser. Almost complete now --
 Refactored project structure to allow for more overview once we add more
 languages. -- Renamed a lot of types in the CParser to be more explicit. --
 Made configuration injectable into the classes that need them. This allows to
 unit test configuration variables. -- Added 2 new config params that allows
 to customize what gets returned for a bool return type. -- Small changes to
 the logic to make it more concise.

---
 src/Lang/C/CParseTree.ts | 121 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 src/Lang/C/CParseTree.ts

(limited to 'src/Lang/C/CParseTree.ts')

diff --git a/src/Lang/C/CParseTree.ts b/src/Lang/C/CParseTree.ts
new file mode 100644
index 0000000..f3ec870
--- /dev/null
+++ b/src/Lang/C/CParseTree.ts
@@ -0,0 +1,121 @@
+import { CToken, CTokenType } from "./CToken";
+
+export class CParseTree {
+
+    /**
+     * Create a tree from CTokens. This consumes the CTokens.
+     * @param CTokens The CTokens to create a tree for.
+     * @param inNested If currently allready nesting.
+     */
+    public static CreateTree(CTokens: CToken[], inNested: boolean = false): CParseTree {
+        const tree: CParseTree = new CParseTree();
+
+        while (CTokens.length > 0) {
+            const token: CToken = CTokens.shift();
+            switch (token.type) {
+                case CTokenType.OpenParenthesis:
+                    tree.nodes.push(this.CreateTree(CTokens, true));
+                    break;
+                case CTokenType.CloseParenthesis:
+                    if (inNested === false) {
+                        throw new Error("Unmatched closing parenthesis.");
+                    }
+                    return tree;
+                default:
+                    tree.nodes.push(token);
+                    break;
+            }
+        }
+
+        if (inNested === true) {
+            throw new Error("No match found for an opening parenthesis.");
+        }
+
+        return tree;
+    }
+
+    public nodes: Array<CToken | CParseTree> = [];
+
+    /**
+     * Compact empty branches. Example ((foo))(((bar))) will become (foo)(bar)
+     * @param tree The CParseTree to compact. Defaults to the current tree.
+     */
+    public Compact(tree: CParseTree = this): CParseTree {
+        const newTree: CParseTree = new CParseTree();
+        newTree.nodes = tree.nodes.map((n) => n);
+        const isNotCompact = (n) => n instanceof CParseTree && n.nodes.length === 1 && n.nodes[0] instanceof CParseTree;
+
+        // Compact current level of nodes to the maximum amount.
+        while (newTree.nodes.some((n) => isNotCompact(n))) {
+            newTree.nodes = newTree.nodes
+                .map((n) =>  n instanceof CParseTree && isNotCompact(n) ? n.nodes[0] : n);
+        }
+
+        // Compact all nested CParseTrees.
+        newTree.nodes = newTree.nodes
+            .map((n) => n instanceof CParseTree ? this.Compact(n) : n);
+
+        return newTree;
+    }
+
+    /**
+     * Copy CParseTree.
+     * @param tree The CParseTree to compact. Defaults to the current tree.
+     */
+    public Copy(tree: CParseTree = this): CParseTree {
+        const newTree: CParseTree = new CParseTree();
+        newTree.nodes = tree.nodes
+            .map((n) => n instanceof CToken ? n : this.Copy(n));
+        return newTree;
+    }
+
+    /**
+     * Create string from the CParseTree which is a representation of the original code.
+     * @param tree The CParseTree to compact. Defaults to the current tree.
+     */
+    public Yield(tree: CParseTree = this): string {
+        let code: string = "";
+
+        for (const node of tree.nodes) {
+            if (node instanceof CParseTree) {
+                code += "(" + this.Yield(node) + ")";
+                continue;
+            }
+
+            switch (node.type) {
+                case CTokenType.Symbol:
+                    code += code === "" ? node.value : " " + node.value;
+                    break;
+                case CTokenType.Pointer:
+                    code += node.value;
+                    break;
+                case CTokenType.Reference:
+                    code += node.value;
+                    break;
+                case CTokenType.ArraySubscript:
+                    code += node.value;
+                    break;
+                case CTokenType.CurlyBlock:
+                    code += node.value;
+                    break;
+                case CTokenType.Assignment:
+                    code += " " + node.value;
+                    break;
+                case CTokenType.Comma:
+                    code += node.value;
+                    break;
+                case CTokenType.Arrow:
+                    code += " " + node.value;
+                    break;
+                case CTokenType.Ellipsis:
+                    code += node.value;
+                    break;
+                case CTokenType.Attribute:
+                    code += code === "" ? node.value : " " + node.value;
+                    break;
+            }
+        }
+
+        return code;
+    }
+}
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