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// from files_mmp.py
mmp-input:
| mmpformat-stmt end-stmt
| mmpformat-stmt compound-stmt-list end-stmt
mmpformat-stmt : mmpformat-reqd-stmt '\n'
| mmpformat-reqd-stmt mmpformat-pref-stmt '\n'
mmpformat-reqd-stmt : 'mmpformat' [0-9]{6} 'required'
mmpformat-pref-stmt : ';' [0-9]{6} 'preferred'
compound-stmt-list :
| compound-stmt compound-stmt-list
compound-stmt:
| kelvin-stmt
| group-block
| end1-stmt
kelvin-stmt: 'kelvin' real-number '\n'
group-block: group-begin-stmt
group-stmt-list
group-end-stmt
group-begin-stmt: 'group' '(' string-identifier ')' '\n'
group-end-stmt: 'egroup' '(' string-identifier ')' '\n'
group-stmt-list:
| group-stmt group-stmt-list
group-stmt:
| info-opengroup-stmt
| csys-stmt
| mol-stmt
| atom-bond-stmt
| info-stmt
mol-stmt : 'mol' '(' string-identifier ')' mol-style '\n' atoms-bonds-stmt-list
mol-style : **TODO**
atoms-bonds-stmt-list : atom-bond-stmt
| atom-bond-stmt atoms-bonds-stmt-list
atom-bond-stmt : atom-stmt bond-stmt-list
atom-stmt: 'atom' id '(' atomic-num ')' coords atom-style-stmt '\n'
atom-style-stmt :
bond-stmt-list :
| bond-stmt bond-stmt-list
bond-stmt: bond1-stmt
| bond2-stmt
| bond3-stmt
| bonda-stmt
| bondg-stmt
| bondc-stmt
bond1-stmt : 'bond1' id-list '\n'
bond2-stmt : 'bond2' id-list '\n'
bond3-stmt : 'bond3' id-list '\n'
bonda-stmt : 'bonda' id-list '\n'
bondg-stmt : 'bondg' id-list '\n'
bondc-stmt : 'bondc' id-list '\n'
coords: '(' integer ',' integer ',' integer ')'
info-stmt : info-chunk-stmt
| info-opengroup-stmt
| info-leaf-stmt
| info-atom-stmt
| info-gamess-stmt
| info-espimage-stmt
| info-povrayscene-stmt
info-atom-stmt : 'info' 'atom' atom-property-value-list '\n'
atom-property-value-list : atom-property-value-key
| atom-property-value-key atom-property-value-list
atom-property-value-key : atom-property-name '=' atom-property-value
atom-property-name : 'atomtype'
atom-property-value : 'sp'
| 'sp2'
| 'sp2_g'
| 'sp3'
| 'sp3d'
end-stmt : 'end' string-list '\n'
string-identifier : string
string-list :
| string string-list
string : identifier | identifier [\s]+ string
identifier: [A-Za-z_][\w]*
id-list : id | id-list id
id: integer
atomic-num: integer
integer: [0-9]+
real-nunber : [-]?[0-9]*.[0-9]([eE][+-]?[0-9]+)?
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