#!/usr/bin/python

import sys
import re
import io

definitionSet = set()
definitionToSourceLocationMap = dict()
callSet = set()

# things we need to exclude for reasons like :
# - it's a weird template thingy that confuses the plugin
exclusionSet = set([
    "class boost::intrusive_ptr<class FontCharMap> FontCharMap::GetDefaultMap(_Bool)"
])

# clang does not always use exactly the same numbers in the type-parameter vars it generates
# so I need to substitute them to ensure we can match correctly.
normalizeTypeParamsRegex = re.compile(r"type-parameter-\d+-\d+")
def normalizeTypeParams( line ):
    return normalizeTypeParamsRegex.sub("type-parameter-?-?", line)

# The parsing here is designed to avoid grabbing stuff which is mixed in from gbuild.
# I have not yet found a way of suppressing the gbuild output.
with io.open("loplugin.unuseddefaultparams.log", "rb", buffering=1024*1024) as txt:
    for line in txt:
        if line.startswith("defn:\t"):
            idx1 = line.find("\t",6)
            idx2 = line.find("\t",idx1+1)
            idx3 = line.find("\t",idx2+1)
            access = line[6:idx1]
            returnType = line[idx1+1:idx2]
            nameAndParams = line[idx2+1:idx3]
            sourceLocation = line[idx3+1:].strip()
            funcInfo = (normalizeTypeParams(returnType), normalizeTypeParams(nameAndParams))
            definitionSet.add(funcInfo)
            definitionToSourceLocationMap[funcInfo] = sourceLocation
        elif line.startswith("call:\t"):
            idx1 = line.find("\t",6)
            returnType = line[6:idx1]
            nameAndParams = line[idx1+1:].strip()
            callSet.add((normalizeTypeParams(returnType), normalizeTypeParams(nameAndParams)))

# Invert the definitionToSourceLocationMap.
# If we see more than one method at the same sourceLocation, it's being autogenerated as part of a template
# and we should just ignore it.
sourceLocationToDefinitionMap = {}
for k, v in definitionToSourceLocationMap.iteritems():
    sourceLocationToDefinitionMap[v] = sourceLocationToDefinitionMap.get(v, [])
    sourceLocationToDefinitionMap[v].append(k)
for k, definitions in sourceLocationToDefinitionMap.iteritems():
    if len(definitions) > 1:
        for d in definitions:
            definitionSet.remove(d)

    
tmp1set = set()
for d in definitionSet:
    clazz = d[0] + " " + d[1]
    if clazz in exclusionSet:
        continue
    if d in callSet:
        continue
    tmp1set.add((clazz, definitionToSourceLocationMap[d]))

# sort the results using a "natural order" so sequences like [item1,item2,item10] sort nicely
def natural_sort_key(s, _nsre=re.compile('([0-9]+)')):
    return [int(text) if text.isdigit() else text.lower()
            for text in re.split(_nsre, s)]

# sort results by name and line number
tmp1list = sorted(tmp1set, key=lambda v: natural_sort_key(v[1]))

# print out the results
with open("loplugin.unuseddefaultparams.report", "wt") as f:
    for t in tmp1list:
        f.write(t[1] + "\n")
        f.write("    " + t[0] + "\n")