Update to v1.5.HEADmaster

  The update to version 1.5 is rather substantial, and introduces some minor
  backward-incompatibilities:
    * The header "#!symbols" has been replaced by "#!virtual_fields"
    * Multiplying polynomials using the '*' symbol is no longer supported (or,
      rather, the symbolic capabilities of meankondo were enhanced, and the
      syntax has been changed).
    * 'meantools exp' has been removed (its functionality is now handled by
      other means)
    * 'meantoolds derive' has been replaced by 'meantools differentiate'

  * The symbolic capabilities were enhanced: polynomials can now be
    multiplied, added, exponentiated, and their logarithms can be taken
    directly in the configuration file.

  * The flow equation can now be processed after being computed using the
    various "#!postprocess_*" entries.

  * Deprecated kondo_preprocess.

  * Compute the mean using an LU decomposition if possible.

  * More detailed checks for syntax errors in configuration file.

  * Check that different '#!group' entries are indeed uncorrelated.

  * New flags in meankondo: '-p' and '-A'.

  * New tool: meantools expand.

  * Improve conversion to LaTeX using meantools-convert

  * Assign terms randomly to different threads.

  * Created vim files to implement syntax highlighting for configuration
    files.

  * Multiple bug fixes

1 files changed, 117 insertions, 0 deletions

diff --git a/src/tree.c b/src/tree.c
new file mode 100644
index 0000000..0edf558
--- /dev/null
+++ b/src/tree.c
@@ -0,0 +1,117 @@
+/*
+Copyright 2015-2022 Ian Jauslin
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+#include "tree.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include "array.h"
+
+// init
+int init_Tree(Tree* tree, int memory_children, int memory_label){
+  init_Char_Array(&(tree->root_label),memory_label);
+  (*tree).children=calloc(memory_children,sizeof(Tree));
+  (*tree).memory=memory_children;
+  (*tree).length=0;
+  return(0);
+}
+int free_Tree(Tree tree){
+  int i;
+  free_Char_Array(tree.root_label);
+  for(i=0;i<tree.length;i++){
+    free_Tree(tree.children[i]);
+  }
+  free(tree.children);
+  return(0);
+}
+
+// copy
+int tree_cpy(Tree input, Tree* output){
+  init_Tree(output,input.length, input.root_label.length);
+  tree_cpy_noinit(input,output);
+  return(0);
+}
+int tree_cpy_noinit(Tree input, Tree* output){
+  int i;
+  if((*output).memory<input.length){
+    fprintf(stderr,"error: trying to copy a tree of length %d to another with memory %d\n",input.length, (*output).memory);
+    exit(-1);
+  }
+  char_array_cpy_noinit(input.root_label,&(output->root_label));
+  for(i=0;i<input.length;i++){
+    tree_cpy(input.children[i],(*output).children+i);
+  }
+
+  (*output).length=input.length;
+  return(0);
+}
+
+// resize memory
+int tree_resize(Tree* tree, int newsize){
+  Tree new_tree;
+  init_Tree(&new_tree,newsize,tree->root_label.memory);
+  tree_cpy_noinit(*tree,&new_tree);
+  free_Tree(*tree);
+  *tree=new_tree;
+  return(0);
+}
+
+// set label
+int tree_set_label(Char_Array label, Tree* tree){
+  if(label.length > tree->root_label.memory){
+    char_array_resize(&(tree->root_label),label.length);
+  }
+  char_array_cpy_noinit(label,&(tree->root_label));
+  return(0);
+}
+
+// add a child to a tree
+int tree_append_child(Tree child, Tree* output){
+  if((*output).length>=(*output).memory){
+    tree_resize(output,2*(*output).memory+1);
+  }
+  tree_cpy(child,(*output).children+(*output).length);
+  (*output).length++;
+  return(0);
+}
+// add a child to a tree without allocating memory for the new child
+int tree_append_child_noinit(Tree child, Tree* output){
+  if((*output).length>=(*output).memory){
+    tree_resize(output,2*(*output).memory+1);
+  }
+  (*output).children[(*output).length]=child;
+  (*output).length++;
+  return(0);
+}
+
+// concatenate the children of two trees
+int tree_concat_children(Tree input, Tree* output){
+  int i;
+  for(i=0;i<input.length;i++){
+    tree_append_child(input.children[i],output);
+  }
+  return(0);
+}
+// noinit
+int tree_concat_children_noinit(Tree input, Tree* output){
+  int i;
+  for(i=0;i<input.length;i++){
+    tree_append_child_noinit(input.children[i],output);
+  }
+  // free input array
+  free(input.children);
+  return(0);
+}
+