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dpsanders/Draw syntax tree.ipynb

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Draw syntax tree.ipynb
{
"cells": [
{
"cell_type": "code",
"execution_count": 18,
"metadata": {
"collapsed": false
},
"outputs": [],
"source": [
"using LightGraphs, TikzGraphs\n",
"using MacroTools"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"## Draw AST (Abstract Syntax Tree)"
]
},
{
"cell_type": "code",
"execution_count": 2,
"metadata": {
"collapsed": false
},
"outputs": [
{
"data": {
"text/plain": [
"add_numbered_vertex! (generic function with 1 method)"
]
},
"execution_count": 2,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"add_numbered_vertex!(g) = (add_vertex!(g); top = nv(g)) # returns the number of the new vertex"
]
},
{
"cell_type": "code",
"execution_count": 81,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"WARNING: Method definition label(Any) in module Main at In[80]:3 overwritten at In[81]:3.\n",
"WARNING: replacing docs for 'label :: Tuple{Any}' in module 'Main'.\n"
]
},
{
"data": {
"text/plain": [
"label"
]
},
"execution_count": 81,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"Convert the current node into a label\"\n",
"function label(sym) \n",
" sym == :(^) && return \"\\\\textasciicircum\" # TikzGraphs chokes on ^\n",
" \n",
" return string(\"\\\\texttt{\", sym, \"}\")\n",
"end"
]
},
{
"cell_type": "code",
"execution_count": 113,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"WARNING: Method definition traverse!(Any, Any, Any) in module Main at In[101]:5 overwritten at In[113]:7.\n",
"WARNING: Method definition traverse!(Any, Any, Any, Any) in module Main at In[101]:5 overwritten at In[113]:7.\n",
"WARNING: replacing docs for 'traverse! :: Union{Tuple{Any,Any,Any,Any},Tuple{Any,Any,Any}}' in module 'Main'.\n"
]
},
{
"data": {
"text/plain": [
"traverse!"
]
},
"execution_count": 113,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"\"\"\"Traverse the expression and build up the graph g and the set of labels\n",
"for each node. (These both get modified in place.) `show_call` specifies whether to include `call` nodes in the graph\n",
"in function calls. Including them represents the Julia AST more precisely, but adds a lot\n",
"of visual noise to the display.\n",
"\n",
"traverse! returns the number of the vertex at the top of the subexpression.\"\"\"\n",
"\n",
"function traverse!(g, labels, ex, show_call=true)\n",
"\n",
" top_vertex = add_numbered_vertex!(g)\n",
" \n",
" start_argument = 1 # which argument to start with\n",
" \n",
" if !(show_call) && ex.head == :call \n",
" f = ex.args[1] # the function name\n",
" push!(labels, label(f))\n",
" start_argument = 2 # drop \"call\" from tree\n",
" \n",
" else\n",
" push!(labels, label(ex.head))\n",
" end\n",
"\n",
" \n",
" for i in start_argument:length(ex.args)\n",
" \n",
" if isa(ex.args[i], Expr)\n",
" \n",
" child = traverse!(g, labels, ex.args[i], show_call)\n",
" add_edge!(g, top_vertex, child)\n",
" \n",
" else\n",
" n = add_numbered_vertex!(g)\n",
" add_edge!(g, top_vertex, n)\n",
" \n",
" push!(labels, label(ex.args[i]))\n",
" \n",
" end\n",
" end\n",
" \n",
" return top_vertex\n",
" \n",
"end"
]
},
{
"cell_type": "code",
"execution_count": 102,
"metadata": {
"collapsed": false
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"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"WARNING: Method definition draw_syntax_tree(Expr) in module Main at In[100]:3 overwritten at In[102]:3.\n",
"WARNING: Method definition draw_syntax_tree(Expr, Any) in module Main at In[100]:3 overwritten at In[102]:3.\n"
]
},
{
"data": {
"text/plain": [
"draw_syntax_tree (generic function with 2 methods)"
]
},
"execution_count": 102,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"function draw_syntax_tree(ex::Expr, show_call=false)\n",
" \n",
" ex = MacroTools.striplines(ex)\n",
" \n",
" g = Graph()\n",
" labels = String[]\n",
" \n",
" traverse!(g, labels, ex, show_call)\n",
" \n",
" TikzGraphs.plot(g, labels)\n",
"end"
]
},
{
"cell_type": "code",
"execution_count": 106,
"metadata": {
"collapsed": false
},
"outputs": [
{
"name": "stderr",
"output_type": "stream",
"text": [
"WARNING: Method definition @tree(Expr) in module Main at In[103]:2 overwritten at In[106]:2.\n",
"WARNING: Method definition @tree_with_call(Expr) in module Main at In[103]:6 overwritten at In[106]:6.\n"
]
},
{
"data": {
"text/plain": [
"@tree_with_call (macro with 1 method)"
]
},
"execution_count": 106,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"macro tree(ex::Expr)\n",
" draw_syntax_tree(ex)\n",
"end\n",
"\n",
"macro tree_with_call(ex::Expr)\n",
" draw_syntax_tree(ex, true)\n",
"end"
]
},
{
"cell_type": "code",
"execution_count": 114,
"metadata": {
"collapsed": false
},
"outputs": [
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]
},
"execution_count": 114,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"t = @tree z = 3x + (2y+1)^2"
]
},
{
"cell_type": "code",
"execution_count": 115,
"metadata": {
"collapsed": false
},
"outputs": [
{
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},
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"metadata": {},
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}
],
"source": [
"t = @tree_with_call z = 3x + (2y+1)^2"
]
},
{
"cell_type": "code",
"execution_count": 116,
"metadata": {
"collapsed": false
},
"outputs": [
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"TikzPictures.TikzPicture(\"\\\\graph [layered layout, ] {\\n1/\\\"\\\\texttt{=}\\\",\\n2/\\\"\\\\texttt{z}\\\",\\n3/\\\"\\\\texttt{f}\\\",\\n4/\\\"\\\\texttt{g}\\\",\\n5/\\\"\\\\texttt{f}\\\",\\n6/\\\"\\\\texttt{x}\\\",\\n7/\\\"\\\\texttt{y}\\\",\\n;\\n1 -> 2;\\n1 -> 3;\\n3 -> 4;\\n4 -> 5;\\n5 -> 6;\\n5 -> 7;\\n};\\n\",\"\",\"\\\\usepackage{fontspec}\\n\\\\setmainfont{Latin Modern Math}\\n\\\\usetikzlibrary{graphs}\\n\\\\usetikzlibrary{graphdrawing}\\n\\n\\\\usegdlibrary{layered}\",true,true)"
]
},
"execution_count": 116,
"metadata": {},
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}
],
"source": [
"t = @tree z = f(g(f(x, y)))"
]
},
{
"cell_type": "code",
"execution_count": 112,
"metadata": {
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},
"outputs": [
{
"data": {
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]
},
{
"cell_type": "code",
"execution_count": 117,
"metadata": {
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},
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"metadata": {},
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}
],
"source": [
"@tree begin\n",
" a = b + c\n",
" d = 2a^2 + a\n",
"end"
]
},
{
"cell_type": "markdown",
"metadata": {
"collapsed": true
},
"source": [
"There is no common subexpression elimination:"
]
},
{
"cell_type": "code",
"execution_count": 118,
"metadata": {
"collapsed": false
},
"outputs": [
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},
"execution_count": 118,
"metadata": {},
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}
],
"source": [
"@tree (f(x^2 + 2x), g(y - (x^2 + 2x)))"
]
},
{
"cell_type": "code",
"execution_count": 119,
"metadata": {
"collapsed": false
},
"outputs": [
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"TikzPictures.TikzPicture(\"\\\\graph [layered layout, ] {\\n1/\\\"\\\\texttt{macrocall}\\\",\\n2/\\\"\\\\texttt{@time}\\\",\\n3/\\\"\\\\texttt{sin}\\\",\\n4/\\\"\\\\texttt{10}\\\",\\n;\\n1 -> 2;\\n1 -> 3;\\n3 -> 4;\\n};\\n\",\"\",\"\\\\usepackage{fontspec}\\n\\\\setmainfont{Latin Modern Math}\\n\\\\usetikzlibrary{graphs}\\n\\\\usetikzlibrary{graphdrawing}\\n\\n\\\\usegdlibrary{layered}\",true,true)"
]
},
"execution_count": 119,
"metadata": {},
"output_type": "execute_result"
}
],
"source": [
"@tree @time sin(10)"
]
}
],
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