#!/usr/bin/env python
# coding: utf-8

# # Openqasm Tutorials
# 
# An openqasm compiler called `oqasm2circ` that compiles openqasm code into a QLM circuit, then dumps it in a file.
# 
# 
# A few examples are available, to compile an openqasm `.qasm` file use the following command:
# 

# In[ ]:


get_ipython().system('oqasm2circ --help')


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get_ipython().run_cell_magic('writefile', 'inverseqft1.qasm', '// QFT and measure, version 1\nOPENQASM 2.0;\ninclude "qelib1.inc";\nqreg q[4];\ncreg c[4];\nh q;\nbarrier q;\nh q[0];\nmeasure q[0] -> c[0];\nif(c==1) u1(pi/2) q[1];\nh q[1];\nmeasure q[1] -> c[1];\nif(c==1) u1(pi/4) q[2];\nif(c==2) u1(pi/2) q[2];\nif(c==3) u1(pi/2+pi/4) q[2];\nh q[2];\nmeasure q[2] -> c[2];\nif(c==1) u1(pi/8) q[3];\nif(c==2) u1(pi/4) q[3];\nif(c==3) u1(pi/4+pi/8) q[3];\nif(c==4) u1(pi/2) q[3];\nif(c==5) u1(pi/2+pi/8) q[3];\nif(c==6) u1(pi/2+pi/4) q[3];\nif(c==7) u1(pi/2+pi/4+pi/8) q[3];\nh q[3];\nmeasure q[3] -> c[3];\n')


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get_ipython().system('oqasm2circ inverseqft1.qasm inverseqft1.circ')


# ## Recovering circuits directly
# 
# It is also possible to use the parser's commands to directly parse a string and recover the QLM circuit object in python for
# further use. 
# 
# Note: This however doesn't thoroughly process _include_ statements, because those are done with the binary.
# 
# 

# In[ ]:


from qat.interop.openqasm.qasm_parser import OqasmParser

# We will use the adder openqasm example from github

file = open("inverseqft1.qasm")
data = file.read()

# Building our parser

oq_parser = OqasmParser()
#oq_parser.build()

# Parsing

#oq_parser.parse(data)

qlm_circuit = oq_parser.compile(data)

from qat.core.util import get_syntax

for index, op in enumerate(qlm_circuit.ops):
    print("Gate {} with params {} on qubits {} and cbits {}".format(*get_syntax(qlm_circuit, index),
                                                                    op.qbits, op.cbits))