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add a function to pretty-print ASTs

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This commit is contained in:
Henri DF 2016-02-12 20:30:19 -08:00
parent 48685f4f2f
commit 3dab9edc9d
1 changed files with 34 additions and 0 deletions
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34
lua/sysdig-parser.lua
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@ -237,6 +237,40 @@ local G = {
OneWord = V"Name" + V"Number" + V"String" + P(1); OneWord = V"Name" + V"Number" + V"String" + P(1);
} }
function print_ast(node, level)
local t = node.type
local prefix = string.rep(" ", level*2)
level = level + 1
if t == "Filter" then
print_ast(node.value, level)
elseif t == "BinaryBoolOp" or t == "BinaryRelOp" then
print(prefix..node.operator)
print_ast(node.left, level)
print_ast(node.right, level)
elseif t == "UnaryRelOp" or t == "UnaryBoolOp" then
print (prefix..node.operator)
print_ast(node.argument, level)
elseif t == "List" then
print(prefix.. "List: ")
for i, v in ipairs(node.elements) do
print_ast(v, level)
end
elseif t == "FieldName" or t == "Number" or t == "String" or t == "BareString" or t == "Macro" then
print (prefix..t.." "..node.value)
elseif t == "MacroDef" then
-- don't print for now
else
error ("Unexpected type: "..t)
end
end
function parser.parse (subject) function parser.parse (subject)
local errorinfo = { subject = subject } local errorinfo = { subject = subject }